Battery plug-in box

Abstract

The application discloses a battery plug-in box. The battery plug-in box comprises a box body, a first connecting piece, a second connecting piece and a plurality of battery modules in the box body. The plurality of battery modules are arranged along a first direction and a second direction, and the first direction is the arrangement direction of a plurality of battery monomers in the battery module. The plurality of battery modules are connected in series through the first connecting piece and the second connecting piece. By arranging the extension direction of the first connecting piece to be parallel to the first direction, the extension direction of the first connecting piece is the same as the arrangement direction of the plurality of battery monomers. In this way, the size of the first connecting piece can be small, the plurality of battery modules can be arranged closely in the first direction, the energy density of the battery plug-in box can be improved, the stability of the first connecting piece when the battery plug-in box is subjected to external impact or extrusion can be improved, and the reliability of the battery plug-in box can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage, in particular to a battery plug-in box. BACKGROUND

[0002] The battery plug-in box is an energy storage device.

[0003] The battery plug-in box comprises a connecting piece and a plurality of battery modules, the connecting piece is located between two adjacent battery modules, the connecting piece can be connected with the transmission rows of the battery modules, so that the plurality of battery modules can be connected in series and in parallel to improve the capacity of the battery modules.

[0004] However, the span between the transmission rows in the above battery plug-in box is large, which leads to poor stability of the connecting piece, thereby leading to poor reliability of the battery plug-in box. SUMMARY

[0005] Embodiments of the present application provide a battery plug-in box. The technical solution is as follows:

[0006] The battery plug-in box comprises a box body, and a first connecting piece, a second connecting piece and a plurality of battery modules located in the box body;

[0007] The plurality of battery modules are arranged in an array in a first direction and a second direction, the first direction and the second direction intersect; the battery module comprises an integrated busbar and a plurality of battery cells, the plurality of battery cells are arranged in the first direction, the integrated busbar is located on the plurality of battery cells, and the plurality of battery cells are connected through the integrated busbar, the integrated busbar has two transmission rows distributed on both sides of the battery module in the first direction;

[0008] The first connecting piece is located between two adjacent battery modules in the first direction, and is connected with two transmission rows in the two battery modules; the second connecting piece is located between two adjacent battery modules in the second direction, and is connected with two transmission rows in the two battery modules; the plurality of battery modules are connected in series through the first connecting piece and the second connecting piece;

[0009] The extension direction of the first connecting piece is parallel to the first direction.

[0010] Optionally, the plurality of battery modules comprise a first battery module and a second battery module, the first battery module and the second battery module are distributed adjacent to each other in the first direction.

[0011] The transmission row of the first battery module towards the second battery module is a first transmission row, and the transmission row of the second battery module towards the first battery module is a second transmission row; the distribution position of the first transmission row in the second direction is the same as that of the second transmission row in the second direction.

[0012] The two ends of the first connecting piece are connected with the first transmission row and the second transmission row respectively.

[0013] Optionally, the battery monomer has a first pole and a second pole arranged in the second direction.

[0014] The battery monomer closest to the second battery module in the first battery module is a first battery monomer, and the battery monomer closest to the second battery module in the second battery module is a second battery monomer; the second pole of the first battery monomer is oppositely arranged with the first pole of the second battery monomer in the first direction.

[0015] The first transmission row is connected with the second pole of the first battery monomer, and the second transmission row is connected with the first pole of the second battery monomer.

[0016] Optionally, the integrated busbar further comprises a plurality of connecting rows; for two adjacent battery monomers in the same battery module, the first pole of one battery monomer is oppositely arranged with the second pole of the other battery monomer in the first direction, and the two ends of the connecting row are connected with the first pole of one battery monomer and the second pole of the other battery monomer respectively.

[0017] Optionally, the plurality of battery modules comprises a third battery module and a fourth battery module, the third battery module and the fourth battery module are adjacently distributed in the second direction; the third battery module is the outermost battery module in a row of battery modules arranged in the first direction, and the transmission row of the third battery module away from the other battery modules in the row of battery modules is a third transmission row; the fourth battery module is the outermost battery module in another row of battery modules arranged in the first direction, and the transmission row of the fourth battery module away from the other battery modules in the other row of battery modules is a fourth transmission row.

[0018] The two ends of the second connecting piece are connected with the third transmission row and the fourth transmission row respectively.

[0019] Optionally, a first battery module in the plurality of battery modules is configured to be connected to the total input end of the battery plug-in box via a transmission row on a side of the first battery module facing away from an adjacent battery module in the first direction; and a last battery module in the plurality of battery modules is configured to be connected to the total output end of the battery plug-in box via a transmission row on a side of the last battery module facing away from an adjacent battery module in the first direction.

[0020] Optionally, the battery module further comprises two end plates, the two end plates being respectively located on two sides of the plurality of battery monomers in the first direction.

[0021] The end plate has a lifting hole, and the lifting hole is distributed on a side of the end plate facing the integrated busbar.

[0022] Optionally, the box body comprises a liquid cooling plate and a box cover buckled on the liquid cooling plate; and the liquid cooling plate and the box cover are in sealed connection.

[0023] The plurality of battery modules are located on the liquid cooling plate and are distributed in a cavity surrounded by the liquid cooling plate and the box cover.

[0024] Optionally, the liquid cooling plate comprises a sealing flat plate, a flow channel bottom plate, and a support frame.

[0025] The sealing flat plate is located on a side of the battery module facing away from the box cover.

[0026] The flow channel bottom plate is connected to a side of the sealing flat plate facing away from the battery module, the flow channel bottom plate has a plurality of flow channel grooves recessed in a direction facing away from the sealing flat plate, and the sealing flat plate and the plurality of flow channel grooves are used to surround a fluid flow channel.

[0027] The support frame is connected to a side of the flow channel bottom plate facing away from the sealing flat plate; the support frame comprises a frame body and a plurality of first support beams; the plurality of first support beams are arranged in the first direction and are fixedly connected to the frame body.

[0028] Each first support beam has at least two first protrusions protruding towards the flow channel bottom plate, the first protrusions abut against the flow channel bottom plate, and a projection of the first protrusions on the sealing flat plate does not overlap with a projection of the flow channel grooves on the sealing flat plate; there is a gap between a region of the first support beam other than the first protrusions and the flow channel bottom plate.

[0029] Optionally, the first support beam comprises a first support beam body and the first protrusions, and a side of the first protrusions facing away from the flow channel bottom plate has a cavity.

[0030] The first support beam body and the first protrusions are integrally stamped and formed.

[0031] Optionally, the first support beam further comprises: a plurality of first reinforcing ribs extending along the second direction, the plurality of first reinforcing ribs being arranged along the first direction;

[0032] The at least two first protrusions comprise: two rows of the first protrusions arranged along the first direction, each row of the first protrusions comprising at least one of the first protrusions, and the plurality of first reinforcing ribs being distributed between the two rows of the first protrusions.

[0033] Optionally, the support frame further comprises: at least one second support beam, the second support beam being fixedly connected with the frame body, and the second support beam being distributed between two adjacent first support beams in the first direction;

[0034] Each of the second support beams has at least two second protrusions protruding towards the flow channel bottom plate, the second protrusions being connected with the flow channel bottom plate, and the second protrusions not overlapping with the projection of the sealing flat plate and the projection of the flow channel groove on the sealing flat plate; and a gap being formed between the second support beam except the second protrusions and the flow channel bottom plate.

[0035] Optionally, the second support beam comprises: a second support beam body and the second protrusions, and a cavity being formed on the side of the second protrusions away from the flow channel bottom plate.

[0036] The second support beam body and the second protrusions are integrally formed by stamping.

[0037] Optionally, the second support beam further comprises: a plurality of second reinforcing ribs extending along the second direction, the plurality of second reinforcing ribs being arranged along the first direction;

[0038] The at least two second protrusions are arranged along the second direction, and at least part of the second reinforcing ribs are distributed between two adjacent second protrusions.

[0039] Optionally, the liquid cooling plate further comprises: at least two third connecting members, the second protrusions being connected with the flow channel bottom plate through the third connecting members.

[0040] Optionally, the support frame further comprises: at least one third support beam, the third support beam extending in parallel with the first direction, the third support beam being located on the side of the first support beam and the second support beam away from the flow channel bottom plate, and the third support beam being fixedly connected with the first support beam and the second support beam.

[0041] The third support beam has a third protrusion protruding towards the flow channel bottom plate, the third protrusion is connected with the flow channel bottom plate, and the third protrusion does not overlap with the projection of the sealing flat plate on the flow channel groove in the projection of the sealing flat plate; there is a gap between the area of the third support beam other than the third protrusion and the flow channel bottom plate.

[0042] Optionally, the liquid cooling plate further comprises: at least two fourth connecting members, the third support beam is connected with the second support beam through the fourth connecting members.

[0043] Optionally, the second support beam further comprises: a fourth protrusion protruding towards the third support beam, the fourth protrusion has a cavity on the side away from the flow channel bottom plate, and the fourth protrusion overlaps with the third support beam in the projection of the sealing flat plate on the third support beam;

[0044] The part of the third support beam overlapping with the fourth protrusion in the projection has a first connecting hole, the fourth protrusion has a second connecting hole corresponding to the first connecting hole, and the fourth connecting member is connected with the flow channel bottom plate after passing through the first connecting hole and the corresponding second connecting hole.

[0045] Optionally, the liquid cooling plate further comprises: liquid inlet components and liquid outlet components in communication with the fluid flow channel, the liquid inlet components and the liquid outlet components are distributed on the same side of the flow channel bottom plate in the first direction; the liquid cooling plate has: liquid inlet flow channel areas and liquid outlet flow channel areas arranged in the second direction, and the liquid inlet flow channel areas are closer to the liquid inlet components in the second direction;

[0046] The fluid flow channel comprises: a plurality of first main flow channels and a plurality of first branch flow channels distributed in the liquid inlet flow channel areas, and a plurality of second main flow channels and second branch flow channels distributed in the liquid outlet flow channel areas; the first main flow channels are in communication with the first branch flow channels, and the second main flow channels are in communication with the second branch flow channels;

[0047] The overall extension direction of the first main flow channels and the second main flow channels is parallel to the first direction.

[0048] Optionally, the number of the liquid inlet flow channel areas is at least two; the liquid cooling plate further has: at least two distribution areas corresponding to the at least two liquid inlet flow channel areas, and the distribution areas are distributed on the side of the corresponding liquid inlet flow channel areas facing the liquid inlet components in the first direction;

[0049] The fluid flow channel further comprises: distribution flow channels distributed in the distribution areas, and the distribution flow channels in the distribution areas are in communication with the first main flow channels in the corresponding liquid inlet flow channel areas.

[0050] Optionally, the flow channel bottom plate further has: a third reinforcing rib distributed in the flow distribution area, the third reinforcing rib has an auxiliary groove, the auxiliary groove is not communicated with the flow channel groove.

[0051] Optionally, in the second direction, the maximum distance between the liquid outlet flow channel area and the adjacent flow distribution area is greater than the maximum distance between the liquid outlet flow channel area and the adjacent liquid inlet flow channel area.

[0052] Optionally, the flow channel bottom plate further has: a plurality of turbulence convexes distributed in the liquid outlet flow channel area; the plurality of second main flow channels and the plurality of second branch flow channels are distributed around the plurality of turbulence convexes;

[0053] Wherein, the side of the turbulence convex facing the side of the sealing flat plate facing the flow channel bottom plate abuts against the side of the sealing flat plate facing the flow channel bottom plate, and the side of the turbulence convex away from the sealing flat plate has a cavity.

[0054] Optionally, the plurality of turbulence convexes include: a plurality of rows of first type turbulence convexes and a plurality of rows of second type turbulence convexes arranged alternately in the first direction, a row of the first type turbulence convexes includes: at least two first type turbulence convexes arranged in the second direction, and a row of the second type turbulence convexes includes: at least two second type turbulence convexes arranged in the second direction.

[0055] Wherein, at least two first type turbulence convexes in a row of the first type turbulence convexes are arranged staggered in the second direction with at least two second type turbulence convexes in a row of the second type turbulence convexes.

[0056] Optionally, in the first direction, the size of the first type turbulence convex is greater than the size of the second type turbulence convex, and in the second direction, the size of at least part of the first type turbulence convex is smaller than the size of the second type turbulence convex.

[0057] Optionally, the liquid cooling plate further includes: a plurality of heat preservation plates connected with the side of the flow channel bottom plate away from the sealing flat plate; in the first direction, one heat preservation plate is distributed between two adjacent first support beams.

[0058] Optionally, the box cover includes: a top cover and a side plate fixedly connected with the outer edge of the top cover; the side plate is annular, and the side of the side plate away from the top cover is sealingly connected with the liquid cooling plate; the side plate has a first opening and a second opening communicated with the cavity, and the first opening and the second opening are distributed on the same side of the battery insertion box in the first direction.

[0059] The battery insertion box further includes: a sealing cover plate, an interface cover plate and a plurality of functional modules.

[0060] The plurality of functional modules are located in the cavity and distributed at positions of the first opening, at least one of the functional modules is connected with the battery module; the sealing cover plate is sealingly connected with the side plate at the first opening; the interface cover plate has a plurality of interfaces connected with the functional modules, and the interface cover plate is sealingly connected with the side plate at the second opening.

[0061] Optionally, the sealing cover plate comprises a cover plate body and a connecting ring plate in a ring shape, the connecting ring plate is distributed around the cover plate body and fixedly connected with an outer edge of the cover plate body, and the connecting ring plate is fixedly connected with the side plate at the first opening.

[0062] In a direction perpendicular to the cover plate body, a side of the sealing cover plate away from the side plate protrudes from a side of the connecting ring plate away from the side plate, and a side of the sealing cover plate towards the side plate has a bearing groove, and a part of the functional module protruding through the first opening is located in the bearing groove.

[0063] Optionally, a side of the top cover away from the liquid cooling plate has a plurality of convex blocks, and each convex block has a groove communicating with the cavity on a side towards the liquid cooling plate.

[0064] Optionally, the battery plug-in box further comprises a plurality of explosion-proof pressure relief valves, the plurality of explosion-proof pressure relief valves are installed on both sides of the side plate in the second direction, and the plurality of explosion-proof pressure relief valves are distributed close to positions of the first opening and the second opening in the first direction.

[0065] The technical scheme provided by the embodiments of the present application has at least the following beneficial effects:

[0066] In the battery plug-in box provided by the present application, a plurality of battery modules are arranged along a first direction and a second direction, the first direction being the arrangement direction of a plurality of battery cells in the battery module. The plurality of battery modules are connected in series by first connecting members and second connecting members, wherein the first connecting member is located between two adjacent battery modules in the first direction and connected with two transmission rows in the two battery modules. By arranging the extension direction of the first connecting member to be parallel to the first direction, the extension direction of the first connecting member is the same as the arrangement direction of the plurality of battery cells. In this way, the size of the first connecting member can be small, which not only improves the compactness of the plurality of battery modules arranged in the first direction, thereby improving the energy density of the battery plug-in box, but also improves the stability of the first connecting member when the battery plug-in box is subjected to external impact or extrusion, thereby improving the reliability of the battery plug-in box. BRIEF DESCRIPTION OF DRAWINGS

[0067] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0068] Figure 1 is a structural schematic diagram of a battery plug-in box provided by the present application;

[0069] Figure 2 is Figure 1 is an exploded view of the battery plug-in box provided by the present application;

[0070] Figure 3 is Figure 2 is an electrical connection schematic diagram of the battery plug-in box provided by the present application;

[0071] Figure 4 is Figure 2 is a structural schematic diagram of a battery module in the battery plug-in box provided by the present application;

[0072] Figure 5 is Figure 2 is a three-dimensional structural schematic diagram of a liquid cooling plate in the battery plug-in box provided by the present application;

[0073] Figure 6 is Figure 5 is an exploded view of the liquid cooling plate provided by the present application;

[0074] Figure 7 is a structural schematic diagram of a sealing flat plate provided by the present application;

[0075] Figure 8 is a structural schematic diagram of a flow channel bottom plate provided by the present application;

[0076] Figure 9 is a structural schematic diagram of a flow channel bottom plate and a flow channel groove provided by the present application;

[0077] Figure 10 is a structural schematic diagram of a support frame provided by the present application;

[0078] Figure 11 is a structural schematic diagram of a first support beam provided by the present application;

[0079] Figure 12 is a structural schematic diagram of a second support beam provided by the present application;

[0080] Figure 13 is Figure 10 is a local enlarged view of a C2 area in the support frame provided by the present application;

[0081] Figure 14 is a partitioned schematic view of a flow channel bottom plate provided by an embodiment of the present application;

[0082] Figure 15 is Figure 9 is a partial enlarged view of a C1 region in a flow channel bottom plate provided by the present application;

[0083] Figure 16 is Figure 14 is a structural schematic view of a flow distribution region in a flow channel bottom plate provided by the present application;

[0084] Figure 17 is Figure 14 is a partial enlarged view of a C3 region in a flow channel bottom plate provided by the present application;

[0085] Figure 18 is Figure 2 is a bottom view of a battery plug-in box provided by the present application;

[0086] Figure 19 is Figure 2 is a front view of a battery plug-in box provided by the present application.

[0087] The specific embodiments of the present application have been shown in the above-described drawings, and will be described in more detail hereinafter. These drawings and written descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0088] In order to make the purpose, technical solutions and advantages of the present application more clear, the embodiments of the present application will be described in further detail below with reference to the drawings.

[0089] In the related art, a battery plug-in box includes a connecting piece and a plurality of battery modules, the connecting piece is located between two adjacent battery modules, and the connecting piece can be connected with the transmission rows of the battery modules, so that the plurality of battery modules can be connected in series and in parallel to improve the capacity of the battery modules. In the current battery plug-in box, the plurality of battery modules are usually arranged side by side, which will make the span between the transmission rows of the two adjacent battery modules larger, and the size of the connecting piece will also be larger, which will not only affect the density of the arrangement of the battery modules, but also easily lead to poor stability of the connecting piece when the battery plug-in box is subjected to external impact and extrusion, thereby affecting the reliability of the connection.

[0090] An embodiment of the present application provides a battery plug-in box, please refer to Figure 1 and Figure 2 , Figure 1 is a structural schematic view of a battery plug-in box provided by an embodiment of the present application, Figure 2 is Figure 1An exploded view of the battery plug-in box is provided. The battery plug-in box 000 includes a box body 200, and a first connecting component 310, a second connecting component 320 and a plurality of battery modules 100 in the box body 200.

[0091] The box body 200 is used to accommodate the battery modules 100 and other structures in the battery plug-in box 000, and protects these structures from external impact and extrusion, thereby improving the safety and stability of the battery plug-in box 000.

[0092] The plurality of battery modules 100 are arranged in a first direction X and a second direction Y, and the first direction X and the second direction Y intersect. For example, the first direction X can be perpendicular to the second direction Y. Here, the battery module 100 is a modular component in the battery plug-in box 000, which can facilitate the assembly, connection and management of the battery plug-in box 000. For example, Figure 2 In the illustrated battery plug-in box 000, the number of battery modules 100 is 4, and the 4 battery modules 100 are arranged in two rows and two columns in the first direction X and the second direction Y. However, the number of battery modules 100 is not limited in the embodiments of the present application, and the number of battery modules 100 can be determined according to the total capacity required by the battery plug-in box 000 and the capacity of a single battery module 100.

[0093] The battery module 100 includes an integrated busbar 120 and a plurality of battery cells 110, the plurality of battery cells 110 are arranged in the first direction X, the integrated busbar 120 is located on the plurality of battery cells 110, and the plurality of battery cells 110 are connected through the integrated busbar 120, and the integrated busbar 120 has two transmission rows 121 distributed on both sides of the battery module 100 in the first direction X.

[0094] Here, the battery cell 110 is used to store or release electrical energy, and the battery cell 110 can be a battery cell. For example, Figure 2 The illustrated battery cell 110 is a square battery cell, which has the characteristics of simple structure, good heat dissipation effect and good safety, etc. However, the embodiments of the present application are not limited thereto, and the battery cell 110 can also be a cylindrical battery cell.

[0095] The integrated busbar 120 (Cells Contact System, CCS) is a component that integrates the connecting component and the acquisition component, which can realize functions such as series-parallel connection of a plurality of battery cells 110, temperature sampling, voltage sampling, etc. The integrated degree of the integrated busbar 120 is high, which helps to improve the energy density and lightweight level of the battery plug-in box 000. The two transmission rows 121 in the integrated busbar 120 can be used as input and output terminals for connecting with other battery modules 100.

[0096] The first connecting member 310 is located between two adjacent battery modules 100 in the first direction X and is connected with two transmission rows 121 in the two battery modules 100. The second connecting member 320 is located between two adjacent battery modules 100 in the second direction Y and is connected with two transmission rows 121 in the two battery modules 100. The plurality of battery modules 100 are connected in series through the first connecting member 310 and the second connecting member 320.

[0097] It should be noted that, since the two transmission rows 121 are distributed on both sides of the battery module 100 in the first direction X, the first connecting member 310 is used to connect any two adjacent battery modules 100 in a row of battery modules 100 arranged in the first direction X. The second connecting member 320 is used to connect two rows of battery modules 100 adjacent in the second direction Y to form a series loop, and not any two adjacent battery modules 100 in the second direction Y are provided with the second connecting member 320. For example, for the plurality of battery modules 100 arranged in two rows and two columns as shown in the figure, in order to connect four battery modules 100 in series, only the two battery modules 100 on the farthest side in the first direction X are connected by the second connecting member 320 to form a series loop. Therefore, for the plurality of battery modules 100 arranged in the first direction X and the second direction Y, the number of first connecting members 310 is greater than the number of second connecting members 320. Figure 2

[0098] The extension direction of the first connecting member 310 is parallel to the first direction X. That is, the extension direction of the first connecting member 310 is the same as the arrangement direction of the plurality of battery monomers 110. In order to enable the first connecting member 310 to effectively connect the two adjacent battery modules 100, the two transmission rows 121 connected by the first connecting member 310 are also arranged in the first direction X, so that the distance between the two transmission rows 121 connected by the first connecting member 310 is small, the size of the first connecting member 310 in the first direction X is small, the part of the first connecting member 310 is reduced, the stability under external force is high, and the material of the first connecting member 310 can be effectively saved. Moreover, the size of the first connecting member 310 in the first direction X is small, which can also make the distance between any two adjacent battery modules 100 in a row of battery modules 100 arranged in the first direction X smaller, thereby improving the compactness of the plurality of battery modules 100 arranged in the first direction X.

[0099] ​Since the number of the first connecting members 310 is greater than the number of the second connecting members 320, and the first connecting members 310 have a greater impact on the tightness of the arrangement of the plurality of battery modules 100 in the battery plug-in box 000, by setting the extension direction of the first connecting members 310, the stability of the first connecting members 310 with a greater number can be effectively improved, and the size of the first connecting members 310 can be reduced, thereby more significantly improving the reliability and energy density of the battery plug-in box 000.

[0100] In summary, the embodiment of the present application provides a battery plug-in box, in which a plurality of battery modules are arranged along a first direction and a second direction, the first direction being the arrangement direction of a plurality of battery cells in the battery module. The plurality of battery modules are connected in series by first connecting members and second connecting members, wherein the first connecting members are located between two adjacent battery modules in the first direction and are connected with two transmission rows in the two battery modules. By setting the extension direction of the first connecting members to be parallel to the first direction, the extension direction of the first connecting members is the same as the arrangement direction of the plurality of battery cells. In this way, the size of the first connecting members can be smaller, which not only improves the tightness of the arrangement of the plurality of battery modules in the first direction, thereby improving the energy density of the battery plug-in box, but also improves the stability of the first connecting members when the battery plug-in box is subjected to external impact or extrusion, thereby improving the reliability of the battery plug-in box.

[0101] The electrical connection in the battery plug-in box is described below:

[0102] Optionally, please refer to Figure 2 and Figure 3 , Figure 3 is Figure 2 a schematic diagram of an electrical connection of the battery plug-in box provided by the present application, Figure 3 The high-voltage loop in the battery plug-in box 000 is shown, which is used to control the charging and discharging of the battery plug-in box 000. The plurality of battery modules 100 includes a first battery module 100a and a second battery module 100b, and the first battery module 100a and the second battery module 100b are distributed adjacent to each other in the first direction X.

[0103] The transmission row 121 on the side of the first battery module 100a facing the second battery module 100b is the first transmission row 121a, and the transmission row 121 on the side of the second battery module 100b facing the first battery module 100a is the second transmission row 121b. The distribution position of the first transmission row 121a in the second direction Y is the same as the distribution position of the second transmission row 121b in the second direction Y. That is, the first transmission row 121a and the second transmission row 121b are oppositely arranged in the first direction X.

[0104] The two ends of the first connecting member 310 are connected with the first transmission row 121a and the second transmission row 121b respectively. In this way, the extension direction of the first connecting member 310 can be parallel to the first direction X to facilitate the arrangement of the first connecting member 310, so that the size of the first connecting member 310 can be smaller, and the reliability of the connection of the first connecting member 310 can be improved.

[0105] It should be noted that, for Figure 2 In the case that the number of the battery cells 110 in the battery module 100 shown is odd, the distribution positions of the two transmission rows 121 in the battery module 100 in the second direction Y are different, that is, the two transmission rows 121 are staggered in the first direction X. Therefore, in order to make the distribution position of the first transmission row 121a in the second direction Y the same as the distribution position of the second transmission row 121b in the second direction Y, the arrangement mode of the plurality of battery cells 110 in the first battery module 100a and the arrangement mode of the plurality of battery cells 110 in the second battery module 100b are different.

[0106] Optionally, the battery cell 110 has a first pole 111 and a second pole 112 arranged in the second direction Y. One of the first pole 111 and the second pole 112 is a positive pole, and the other is a negative pole. For example, for Figure 2 In the first battery module 100a and the second battery module 100b shown, the first pole 111 is a positive pole, and the second pole 112 is a negative pole.

[0107] The battery cell 110 closest to the second battery module 100b in the first battery module 100a is a first battery cell 110a, and the battery cell 110 closest to the second battery module 100b in the second battery module 100b is a second battery cell 110b, that is, the first battery cell 110a and the second battery cell 110b are the two closest battery cells 110 in the first battery module 100a and the first battery module 100a respectively. The second pole 112 of the first battery cell 110a and the first pole 111 of the second battery cell 110b are oppositely arranged in the first direction X.

[0108] The first transmission row 121a is connected with the second pole 112 of the first battery cell 110a, and the second transmission row 121b is connected with the first pole 111 of the second battery cell 110b. In this way, the first transmission row 121a and the second transmission row 121b can be oppositely arranged in the first direction X, and the first connecting member 310 can be effectively connected with the first transmission row 121a and the second transmission row 121b to form a series loop.

[0109] Optionally, please refer to Figure 3 andFigure 4 , Figure 4 is Figure 2 A structural diagram of a battery module in a battery cabinet is provided. The integrated busbar 120 further comprises a plurality of connecting busbars 122. For two adjacent battery cells 110 in the same battery module 100, the first pole 111 of one battery cell 110 and the second pole 112 of the other battery cell 110 are oppositely arranged in the first direction X, and the two ends of the connecting busbar 122 are connected with the first pole 111 of one battery cell 110 and the second pole 112 of the other battery cell 110, respectively. In this way, the plurality of connecting busbars 122 can connect the plurality of battery cells 110 in the same battery module 100 in series to form a series loop.

[0110] In the present application, the two transmission busbars 121 correspond to the first and last battery cells, respectively, and the transmission busbar 121 is located above the corresponding battery cell 110, and the transmission busbar 121 and the first pole 111 or the second pole 112 of the corresponding battery cell 110 can be welded together to achieve electrical connection and fixed and fixed effect. For example, the first transmission busbar 121a is welded with the pole of the second pole 112 of the first battery cell 110a, and the second transmission busbar 121b is welded with the pole of the first pole 111 of the second battery cell 110b. Similarly, each connecting busbar 122 corresponds to two adjacent battery cells 110, and the connecting busbar 122 is located above the corresponding two battery cells 110, and the connecting busbar 122 and the first pole 111 of the corresponding one battery cell 110 can be welded together, and the connecting busbar 122 and the second pole 112 of the corresponding other battery cell 110 can be welded together to achieve electrical connection and fixed effect. For example, the transmission busbar 121 and the connecting busbar 122 can both be aluminum busbars, but the present application is not limited thereto.

[0111] Optionally, the plurality of battery modules 100 comprises a third battery module 100c and a fourth battery module 100d, and the third battery module 100c and the fourth battery module 100d are distributed adjacent to each other in the second direction Y. The third battery module 100c is the outermost battery module 100 in a row of battery modules 100 arranged in the first direction X, and the transmission busbar 121 away from the side of the other battery modules 100 in the row of battery modules 100 is the third transmission busbar 121c. The fourth battery module 100d is the outermost battery module 100 in another row of battery modules 100 arranged in the first direction X, and the transmission busbar 121 away from the side of the other battery modules 100 in the other row of battery modules 100 is the fourth transmission busbar 121d.

[0112] It should be noted that the third battery module 100c and the fourth battery module 100d are two battery modules 100 adjacent to each other in the second direction Y except for the first battery module 100 and the last battery module 100. In addition, for the plurality of battery modules 100 arranged in two rows and two columns, the fourth battery module 100d is also the second battery module 100b, and the two transmission rows 121 of the fourth battery module 100d are the second transmission row 121b and the fourth transmission row 121d respectively. Figure 2 The plurality of battery modules 100 arranged in two rows and two columns are shown, and the fourth battery module 100d is also the second battery module 100b, and the two transmission rows 121 of the fourth battery module 100d are the second transmission row 121b and the fourth transmission row 121d respectively.

[0113] The two ends of the second connecting piece 320 are connected with the third transmission row 121c and the fourth transmission row 121d respectively, so that the second connecting piece 320 can connect two battery modules 100 adjacent to each other in the second direction Y in series. Here, the extension direction of the second connecting piece 320 is parallel to the second direction Y, and the size of the first connecting piece 310 in the first direction X can be smaller than the size of the second connecting piece 320 in the second direction Y.

[0114] In this application, the first connecting piece 310 is in contact with the corresponding transmission row 121 and is locked by a bolt to realize the electrical connection and fixation of the first connecting piece 310 and the corresponding transmission row 121. Similarly, the second connecting piece 320 is in contact with the corresponding transmission row 121 and is locked by a bolt to realize the electrical connection and fixation of the second connecting piece 320 and the corresponding transmission row 121.

[0115] Optionally, the transmission row 121 on the side away from the adjacent battery module 100 of the first battery module 100 in the plurality of battery modules 100 in the first direction X is used to connect with the total input end 511 of the battery plug-in box 000. The transmission row 121 on the side away from the adjacent battery module 100 of the last battery module 100 in the plurality of battery modules 100 in the first direction X is used to connect with the total output end 512 of the battery plug-in box 000. Here, the total input end 511 and the total output end 512 of the battery plug-in box 000 are connected with the outside, and the total input end 511 can be a total positive high-voltage connector socket and the total output end 512 can be a total negative high-voltage connector socket.

[0116] In the present application, the transmission bus 121 can be connected to the total input end 511 or the total output end 512 through a copper bus, and the first connecting element 310 and the second connecting element 320 can also be copper buses. First, the copper bus has good electrical performance. The electrical conductivity of copper material is about 1.6 times that of aluminum, which can effectively reduce the loss in the process of electrical energy transmission, improve the energy utilization efficiency, and ensure the efficient transmission of electricity. Moreover, the copper material has low resistance, which can reduce the heat generated when the current passes through, reduce energy loss, improve the operation stability of the battery plug-in box 000, and prolong the service life. Second, the copper bus has strong mechanical performance. The copper bus has good mechanical strength and can withstand certain external pressure and impact, and is not easy to deform or damage, which ensures the stability and reliability of the electrical connection of the battery plug-in box 000. Third, the copper bus has good heat dissipation performance. The copper material has good thermal conductivity, which helps to quickly dissipate heat in the battery plug-in box 000, effectively prevents equipment failure or performance degradation caused by overheating, and ensures that the equipment operates at a safe working temperature. Fourth, the copper bus has good corrosion resistance and good resistance to various corrosive media in the atmosphere, water and soil. In different environmental conditions, especially in outdoor or humid environments, it can maintain stable performance and reduce electrical failures caused by corrosion. Fifth, the copper bus is easy to install. Compared with some other conductive connection methods, the cross section of the copper bus is smaller, which can be more conveniently installed and wired in limited space, and helps to improve the space utilization of the equipment.

[0117] Optionally, the battery plug-in box 000 can further include a fuse 600a and a manual service switch 600b (Manual Service Disconnect, MSD), the fuse 600a is connected to the manual service switch 600b and the transmission bus 121 of the last battery module 100 respectively, the manual service switch 600b is connected to the fuse 600a and the total output end 512 respectively, and the transmission bus 121, the fuse 600a and the manual service switch 600b, and the manual service switch 600b and the total output end 512 are connected through copper buses to improve the electrical connection performance.

[0118] Among them, the fuse 600a can quickly cut off the circuit when an abnormality such as overload or short circuit occurs in the high-voltage loop, prevent the fault from expanding, and ensure the safe and stable operation of the circuit, so that the battery plug-in box 000 can avoid damage under the impact of an abnormal large current. Moreover, the fuse 600a has small size and various installation methods, and the replacement operation is simple after the fuse 600a is fused. According to the rated current, working characteristics and the like of different circuits, the present application can select a fuse with appropriate specifications to achieve precise protection and ensure timely action at the specified current threshold.

[0119] For example, the fuse 600a can be a passive fuse that melts and cuts off the circuit to prevent potential damage to equipment or fire hazards when the current in the circuit exceeds the set value through the thermal accumulation effect of the fuse. Passive fuses do not require external control and only rely on heat generated when the current exceeds the set value to trigger the fuse.

[0120] The manual maintenance switch 600b is used to quickly cut off the circuit when the battery plug-in box 000 fails, abnormally or needs emergency maintenance, to avoid further development of dangerous situations and ensure the safety of personnel and equipment. For example, in the event of an emergency such as battery overheating, short circuit, etc., the circuit can be disconnected in time to prevent serious consequences such as fire, explosion, etc. The manual maintenance switch 600b can also effectively prevent the circuit from being turned on or off due to misoperation or accidental situations, reducing the risk of safety. In addition, when performing routine maintenance, repair or replacement of parts on the battery plug-in box 000, the manual maintenance switch 600b can be operated to isolate multiple battery modules 100 from external circuits, making maintenance work safer and more convenient. For example, when replacing battery cells 110 or checking the circuit, maintenance personnel can first disconnect the manual maintenance switch 600b to ensure that no current passes through during the operation process, reducing the risk of electric shock.

[0121] Based on this, the embodiments of the present application can effectively improve the safety and stability of the battery plug-in box 000 by configuring a manual maintenance switch 600b and a fuse 600a in the negative electrode circuit.

[0122] The structure in the battery module is described as follows:

[0123] Optionally, please refer to Figure 4 The battery module 100 further includes two end plates 130, which are respectively located on both sides of the plurality of battery cells 110 in the first direction X. The end plate 130 can be used in cooperation with the steel belt 140, and the steel belt 140 surrounds the two end plates 130 and the plurality of battery cells 110, so as to fix the plurality of battery cells 110. The end plate 130 is also used to protect the plurality of battery cells 110 and can effectively resist the expansion force of the battery cells 110 during charging and discharging.

[0124] Exemplarily, the end plate 130 can be a metal end plate manufactured by a casting process, which has good yield strength. For the case that the end plate 130 is a metal end plate, a first insulating sheet 150 can be arranged between the end plate 130 and the battery monomer 110 to play an insulating protection role. For the battery monomer 110 closest to the end plate 130, the battery monomer 110 has a first surface opposite to the end plate 130 and an annular side surface connected to the first surface, and the first insulating sheet 150 wraps at least part of the first surface and the side surface, so as to effectively prevent the battery monomer 110 from leaking electricity from the first surface and the side surface, and improve the safety.

[0125] The end plate 130 has a lifting hole K3, and a hook in the lifting tool can be hooked in the lifting hole K3, so that the entire battery module 100 can be moved by moving the end plate 130. The lifting holes K3 are distributed on the side of the end plate 130 facing the integrated busbar 120, so that the interference between the lifting tool and the installed battery module 100 can be reduced, so that the gap between the adjacent battery modules 100 in the first direction X can be reduced, so as to improve the compactness of the arrangement of the battery module 100, and thus the energy density of the battery plug-in box can be improved. Exemplarily, the number of lifting holes K3 in the end plate 130 is two, and the two lifting holes K3 are distributed on both sides of the end plate 130 in the second direction Y to ensure balanced force.

[0126] The end plate 130 also has a through hole K5, and by connecting a connecting member such as a screw rod through the through hole K5 and connecting with the box body 200, the end plate 130 can be fixed in the box body 200. Exemplarily, the number of through holes K5 in the end plate 130 is three, and the three through holes K5 are distributed on both sides and the middle region of the end plate 130 in the second direction Y to ensure balanced force.

[0127] Optionally, the integrated busbar 120 includes a bearing substrate 124, and a collection assembly 123, two transmission rows 121 and a plurality of connection rows 122 on the bearing substrate 124. The collection assembly 123 includes a voltage collection piece 123a and a temperature collection piece 123b. Exemplarily, full voltage collection and half temperature collection can be adopted, that is, each battery monomer 110 corresponds to one voltage collection piece 123a, so that the collection assembly 123 can collect the voltage of each battery monomer 110, and every two battery monomers 110 correspond to one temperature collection piece 123b, so that the temperature collected by one temperature collection piece 123b reflects the temperature of two battery monomers 110. However, the application is not limited thereto, and full temperature collection can also be adopted.

[0128] The acquisition assembly 123 is in communication connection with a battery management system 600c (BMS), so that the battery management system 600c can receive the voltage acquisition data and the temperature acquisition data. For example, the acquisition assembly 123 is a wire harness, and a plug at the end of the wire harness can be connected to an interface of the battery management system 600c. However, the application is not limited thereto, and the acquisition assembly 123 can also be a flexible circuit board.

[0129] The structure of the box body in the battery plug-in box will be described below.

[0130] Optionally, referring to Figure 2 , the box body 200 includes a liquid cooling plate 210 and a box cover 220 buckled on the liquid cooling plate 210. The liquid cooling plate 210 and the box cover 220 are sealingly connected. For example, an annular waterproof sealing silica gel pad can be arranged between the liquid cooling plate 210 and the box cover 220, so as to improve the sealing and waterproof effect of the battery plug-in box 000, thereby improving the applicability of the battery plug-in box 000 in various application environments.

[0131] The plurality of battery modules 100 are located on the liquid cooling plate 210 and distributed in the cavity surrounded by the liquid cooling plate 210 and the box cover 220. For example, the battery modules 100 can be fixed on the liquid cooling plate 210 by connecting members such as screws. Here, the liquid cooling plate 210 not only can bear the plurality of battery modules 100, but also can improve the heat dissipation effect of the plurality of battery modules 100.

[0132] Compared with other types of cooling systems such as air cooling and natural cooling, the liquid cooling plate 210 can quickly take away the heat generated by the battery by heat exchange through liquid convection, thereby reducing the temperature of the battery. The heat dissipation efficiency of the liquid cooling plate 210 is high. The liquid medium in the liquid cooling plate 210 has high heat exchange coefficient and large heat capacity, so that the temperature distribution in the battery pack is more uniform, and the consistency of the temperature field of the battery pack is improved. Therefore, the liquid cooling plate 210 helps to maintain the battery operating in the optimal working temperature range, thereby improving the energy density and service life of the battery.

[0133] In one possible implementation, referring to Figure 5 , Figure 5 is Figure 2 a schematic diagram of the three-dimensional structure of a liquid cooling plate in the battery plug-in box provided by the application. The liquid cooling plate 210 has a sealed flow channel, and the cooling liquid is filled in the flow channel. The liquid cooling plate 210 can be a stamping fiber welding liquid cooling plate. The stamping fiber welding process can facilitate the manufacture of the flow channel in the liquid cooling plate 210, so that the cooling liquid forms more uniform and faster flow in the liquid cooling plate 210, further enhancing the heat dissipation effect. The stamping fiber welding liquid cooling plate has good sealing performance, which can ensure that the cooling liquid does not leak, and avoid the decline of the heat dissipation effect or damage to the equipment caused by leakage.

[0134] Optionally, please refer to Figures 5 to 10 , Figure 6 is Figure 5 an exploded view of the liquid cooling plate provided by the present application, Figure 7 is a structural schematic diagram of a sealing flat plate provided by an embodiment of the present application, Figure 8 is a structural schematic diagram of a flow channel bottom plate provided by an embodiment of the present application, Figure 9 is a structural schematic diagram of a flow channel bottom plate and a flow channel groove provided by an embodiment of the present application, Figure 10 is a structural schematic diagram of a support frame provided by an embodiment of the present application. The liquid cooling plate 210 comprises a sealing flat plate 211, a flow channel bottom plate 212 and a support frame 213.

[0135] The sealing flat plate 211 is located on the side of the battery module 100 away from the box cover 220. The sealing flat plate 211 can be in contact with the battery module 100 and plays a role of bearing.

[0136] The flow channel bottom plate 212 is connected to the side of the sealing flat plate 211 away from the battery module 100. The flow channel bottom plate 212 has a plurality of flow channel grooves A1, which are recessed towards the direction away from the sealing flat plate 211. The sealing flat plate 211 and the plurality of flow channel grooves A1 are used to enclose a fluid flow channel. Among them, the plurality of flow channel grooves A1 can be in communication with each other.

[0137] In a possible implementation manner, as shown in Figure 8 and Figure 9 , in order to facilitate observation, the flow channel grooves A1 are shown in a way of being filled with shadows in Figure 9 . The fluid flow channel enclosed by the sealing flat plate 211 and the plurality of flow channel grooves A1 can also refer to the form of the flow channel grooves A1 in Figure 9 . In the present embodiment, the whole after the sealing flat plate 211 and the flow channel bottom plate 212 are fixedly connected can be defined as a flow channel plate.

[0138] As shown in Figure 6 and Figure 10 , the support frame 213 is connected to the side of the flow channel bottom plate 212 away from the sealing flat plate 211. The support frame 213 comprises a frame body B4 and a plurality of first support beams B1. The plurality of first support beams B1 are arranged in the first direction X and are all fixedly connected to the frame body B4.

[0139] The first support beam B1 has at least two first protrusions B11 protruding towards the flow channel bottom plate 212, the first protrusions B11 abut against the flow channel bottom plate 212, and the first protrusions B11 do not overlap with the projection of the flow channel groove A1 on the sealing flat plate 211. The area of the first support beam B1 other than the first protrusions B11 has a gap with the flow channel bottom plate 212. Here, the first protrusions B11 abut against the part of the flow channel bottom plate 212 other than the flow channel groove A1, so that the other parts of the first support beam B1 other than the first protrusions B11 do not contact the flow channel bottom plate 212.

[0140] In the embodiment of the present application, the sealing flat plate 211 abuts against the part of the flow channel bottom plate 212 other than the flow channel groove A1, and the first protrusions B11 of the first support beam B1 abut against the part of the flow channel bottom plate 212 other than the flow channel groove A1. Thus, when the support frame 213 supports the flow channel plate (specifically, the flow channel bottom plate 212), it supports the part of the flow channel bottom plate 212 other than the flow channel groove A1, that is, the solid part of the flow channel plate. Therefore, the part of the flow channel bottom plate 212 with the flow channel groove A1 does not contact the support frame 213, and when the battery module is carried, the part of the flow channel bottom plate 212 with the flow channel groove A1 does not deform under pressure, that is, the hollow part of the flow channel plate does not deform under pressure. Therefore, the fluid flow channel can remain complete and not deformed during use of the liquid cooling plate 210, so that the cooling function of the liquid cooling plate 210 can be ensured not to be affected.

[0141] It should be noted that the support frame 213 is connected to the side of the flow channel bottom plate 212 away from the sealing flat plate 211, and the two can be detachably connected. For example, after the flow channel bottom plate 212 is fixedly connected with the sealing flat plate 211 to form a flow channel plate, the support frame 213 is detachably connected with the flow channel plate. In this way, deformation of the flow channel bottom plate 212 caused by fixedly connecting the support frame 213 with the flow channel bottom plate 212 by welding or the like can be avoided, so that the connection of the flow channel bottom plate 212 with the sealing flat plate 211 can be ensured, that is, the air tightness of the fluid flow channel can be ensured.

[0142] Please refer to Figures 5 to 7 The liquid cooling plate 210 can further include a liquid inlet member 216 and a liquid outlet member 217 for connecting with a cooling medium supply system. The sealing flat plate 211 can have a liquid inlet port 211a and a liquid outlet port 211b, and the flow channel groove A1 of the flow channel bottom plate 212 can have a corresponding liquid inlet port 212a and a liquid outlet port 212b. After the flow channel bottom plate 212 is fixedly connected with the sealing flat plate 211, the liquid inlet port 211a and the liquid outlet port 211b of the sealing flat plate 211 serve as the liquid inlet port and the liquid outlet port of the fluid flow channel.

[0143] The structure of the support frame 213 is described in detail below.

[0144] In some possible implementation manners, refer to Figure 10 The frame body B4 can include a front bottom cross beam B41, a rear bottom cross beam B42, and two side beams B43, which can form a square frame body B4. The front bottom cross beam B41 and the side beam B43, and the rear bottom cross beam B42 and the side beam B43 can be fixedly connected in a resistance welding manner. Of course, the frame body B4 can also adopt other implementation manners, and the embodiments of the present application are not limited.

[0145] In some possible implementation manners, refer to Figure 11 , Figure 11 is a structural schematic diagram of a first support beam provided by an embodiment of the present application. The first support beam B1 includes a first support beam body B12 and a first protrusion B11. The first protrusion B11 has a cavity on the side away from the flow channel bottom plate 212.

[0146] For example, the first support beam body B12 and the first protrusion B11 are integrally formed by stamping. Here, the first support beam B1 can be formed by stamping, so that the first support beam body B12 and the first protrusion B11 can be integrally formed. That is, the first protrusion B11 is a stamping protrusion relative to the first support beam body B12. The stamping protrusion has a cavity on the side away from the flow channel bottom plate 212. The stamping protrusion can adapt to the shape between the flow channel grooves A1 and support the part of the flow channel bottom plate 212 other than the flow channel grooves A1.

[0147] Because the fluid flow channel of the flow channel plate is a cavity structure and has a relatively thin wall thickness. The cavity structure lacks sufficient internal support: the internal space of the cavity structure is relatively large, and lacks sufficient internal support. The part of the first support beam B1 other than the first protrusion B11 cannot directly contact and support the cavity structure of the flow channel plate. In the case that the liquid cooling plate 210 carries a battery module, the cavity structure of the flow channel plate is deformed and collapsed under stress, the fluid flow channel is collapsed, the flow path of the cooling medium (such as cooling liquid) is blocked, which can increase the overall flow resistance of the liquid cooling plate 210 and affect the performance index of the liquid cooling plate 210. Therefore, by arranging the first protrusion B1, direct contact with the cavity structure of the fluid flow channel is avoided, and the cavity structure is deformed and collapsed under stress. The area where the first protrusion B1 contacts the flow channel bottom plate 212 has no flow channel cavity structure and is a solid structure. This area can be used as a carrying part to support the flow channel plate carried by the support frame 213, and will not cause hard contact deformation by directly contacting the cavity structure of the flow channel plate.

[0148] In addition, the first support beam B1 can be fixedly connected to the edge beam B43 of the frame body B4 on both sides of the second direction Y by resistance welding, which has high welding quality. When the fusion nucleus is formed, it is always surrounded by plastic ring, the molten metal is isolated from the air, the metallurgical process is simple, the chemical composition of the weld metal is uniform, and it is basically consistent with the base material. The welding heat is concentrated, the heating range is small, the heat affected zone is small, so the welding deformation is small and easy to control. And resistance welding does not need filler metal such as welding wire and electrode, and welding materials such as oxygen, acetylene and hydrogen, which saves the cost of welding materials. Because the welding process is relatively simple, and no complex subsequent processing process is needed, the overall welding cost can be reduced.

[0149] Optionally, the first support beam B1 further comprises: a plurality of first reinforcing ribs B13 extending along the second direction Y, and the plurality of first reinforcing ribs B13 are arranged along the first direction X. The first reinforcing rib B13 has a gap with the flow channel bottom plate 212, that is, the first reinforcing rib B13 is not in contact with the flow channel bottom plate 212.

[0150] In some possible implementation manners, the at least two first protrusions B11 comprise: two rows of first protrusions B11 arranged along the first direction X, and each row of first protrusions B11 comprises at least one first protrusion B11. For example, as shown in Figure 11 As shown, the number of first protrusions B11 in the first support beam B1 is four, and they are arranged in two rows and two columns. The plurality of first reinforcing ribs B13 are distributed between the two rows of first protrusions B11.

[0151] The first reinforcing rib B13 and the first protrusion B11 can be an integrally stamped structure. By adopting a sheet metal stamping process, a linear convex rib (that is, the first reinforcing rib B13) is stamped out in the first direction X, which can increase the moment of inertia of the material. The shape of the first reinforcing rib B13 increases the additional material distribution in the structure, which increases the moment of inertia of the cross section of the structure. The moment of inertia is an important parameter for measuring the bending and torsional resistance of an object. The larger the moment of inertia, the stronger the structure's resistance to bending and torsion. When the structure is subjected to external force, stress tends to concentrate in some local areas. The presence of the first reinforcing rib B13 can disperse these concentrated stresses to a larger area, reducing local stress peaks and improving the overall load-bearing capacity of the structure. The first reinforcing rib B13 can increase the stiffness of the structure, so that it is not easy to deform and lose stability when subjected to external force. Adding the first reinforcing rib B13 can significantly improve its stability and prevent excessive deformation or bending during use. The first reinforcing rib B13 itself has a certain strength and stiffness, which can directly bear part of the external force, reduce the load borne by the main structure, share part of the pressure, and enhance the overall strength.

[0152] In some possible implementation manners, please refer to Figure 10 and Figure 12 ,Figure 12 is a structural schematic diagram of a second support beam provided by an embodiment of the present application. The support frame 213 further comprises: at least one second support beam B2, the second support beam B2 is fixedly connected with the frame body B4, and the second support beam B2 is distributed between two adjacent first support beams B1 in the first direction X.

[0153] The second support beam B2 can have a similar effect to the first support beam B1, that is, to support the part of the flow channel bottom plate 212 except the flow channel groove A1. The second support beam B2 can be further provided with a fifth connecting hole H5 on the second protrusion B21. The third connecting piece 214 can pass through the fifth connecting hole H5 of the second support beam B2 and the third connecting hole H3 of the flow channel bottom plate 212, so as to detachably connect the second support beam B2 with the flow channel bottom plate 212. In this way, the flow channel bottom plate 212 can be connected with the second support beam B2 in addition to being connected with the frame body B4. The third connecting piece 214 can also pass through the sixth connecting hole H6 of the sealing flat plate 211.

[0154] In addition, the second support beam B2 can be located at the middle position of the support frame 213 in the first direction X. The load-bearing capacity of the support frame 213 for the middle part of the flow channel plate is crucial. The battery module 100 is located above the liquid cooling plate 210. As the number of battery modules 100 increases or the weight of the battery module 100 increases, the middle part is subjected to the maximum compressive stress. The liquid cooling plate 210 needs to have sufficient load-bearing capacity to prevent deformation, damage, and other situations caused by inability to withstand the weight, affecting the normal work and service life of the battery pack. In actual use, the liquid cooling plate 210 may be subjected to pressure from various directions, such as fastening force during installation, extrusion force of other components inside the battery pack, etc. If the load-bearing capacity of the middle part is insufficient, it is easy to be extruded and deformed under the action of these pressures. Once the flow channel plate is deformed, it may cause poor flow of the cooling liquid, affecting the heat dissipation effect, and even possibly damaging the liquid cooling plate 210 itself, posing a safety hazard. In some complex working environments, the liquid cooling plate 210 may be subjected to uneven stress distribution. Strengthening the load-bearing design can better disperse these stresses in the middle part, avoiding stress concentration in a certain point or area, thereby reducing the risk of damage to the flow channel plate due to excessive local stress.

[0155] Each second support beam B2 has at least two second protrusions B21 protruding towards the flow channel bottom plate 212. The second protrusions B21 are connected with the flow channel bottom plate 212, for example, the second protrusions B21 and the flow channel bottom plate 212 can be connected by welding, clamping, riveting, threaded connection, etc. The orthographic projection of the second protrusions B21 on the sealing flat plate 211 does not overlap with the orthographic projection of the flow channel groove A1 on the sealing flat plate 211. There is a gap between the area of the second support beam B2 except the second protrusions B21 and the flow channel bottom plate 212.

[0156] Optionally, the second support beam B2 comprises a second support beam body B22 and a second protrusion B21, the second protrusion B21 has a cavity on the side away from the runner bottom plate 212.

[0157] The second support beam body B22 and the second protrusion B21 are integrally formed by stamping. Here, the second support beam B2 can be formed by stamping, so that the second support beam body B22 and the second protrusion B21 can be integrally formed. That is, the second protrusion B21 is a stamping protrusion relative to the second support beam body B22, and the side of the stamping protrusion away from the runner bottom plate 212 is a cavity. The stamping protrusion can adapt to the shape between the runner grooves A1 and support the part of the runner bottom plate 212 other than the runner grooves A1.

[0158] Optionally, the second support beam B2 further comprises a plurality of second reinforcing ribs B23 extending along the second direction Y, and the plurality of second reinforcing ribs B23 are arranged along the first direction X.

[0159] The at least two second protrusions B21 are arranged along the second direction Y, and at least part of the second reinforcing ribs B23 are distributed between two adjacent second protrusions B21. The second reinforcing rib B23 has a gap with the runner bottom plate 212, that is, the second reinforcing rib B23 does not contact the runner bottom plate 212.

[0160] As shown in the example, Figure 12 The plurality of second reinforcing ribs B23 can be divided into a plurality of groups, each group of second reinforcing ribs B23 has at least two second reinforcing ribs B23 arranged along the first direction X; and one second protrusion B21 can be distributed with a group of second reinforcing ribs B23 on both sides in the second direction Y.

[0161] Optionally, at least part of the second reinforcing ribs B23 can be distributed on both sides of the second protrusion B21 in the first direction X. The second support beam body B22 and the second reinforcing rib B23 are integrally formed by stamping.

[0162] The second reinforcing rib B23 is arranged to strengthen the load bearing capacity of the second support beam B2. The second support beam B2 at the middle position is stamped with a plurality of linear convex ribs (i.e., the second reinforcing rib B23) in the second direction Y, thereby increasing the moment of inertia of the material. The shape of the second reinforcing rib B23 increases the additional material distribution in the structure, which increases the moment of inertia of the cross section of the structure. When the structure is subjected to external force, stress is easily concentrated in some local areas. The presence of the second reinforcing rib B23 can disperse these concentrated stresses to a larger area, reducing local stress peaks, thereby improving the overall load bearing capacity of the structure. The second reinforcing rib B23 can increase the stiffness of the structure, so that it is not easy to deform and lose stability when subjected to external force. Adding the second reinforcing rib B23 can significantly improve its stability and prevent excessive deformation or bending during use. The second reinforcing rib B23 itself has a certain strength and stiffness, which can directly bear a part of the external force, reduce the load borne by the main structure, share part of the pressure, and enhance the overall strength.

[0163] Therefore, the second support beam B2 can effectively disperse stress from all directions, prevent stress concentration, improve the bottom impact resistance of the battery pack, and also increase the structural strength and load bearing capacity of the liquid cooling plate 210.

[0164] Optionally, the liquid cooling plate 210 further comprises: at least two third connecting pieces 214, the second protrusion B21 is connected with the flow channel bottom plate 212 through the third connecting piece 214. That is, the second protrusion B21 and the part of the flow channel bottom plate 212 except the flow channel groove A1 are connected through the third connecting piece 214.

[0165] In some possible implementation manners, refer to Figure 10 and Figure 13 , Figure 13 is Figure 10 a partial enlarged view of the C2 area in the support frame provided by the application. The support frame 213 further comprises: at least one third support beam B3, the extending direction of the third support beam B3 is parallel to the first direction X, the third support beam B3 is located on the side of the first support beam B1 and the second support beam B2 facing the flow channel bottom plate 212, and the third support beam B3 is fixedly connected with the first support beam B1 and the second support beam B2.

[0166] The third support beam B3 has a third protrusion B31 protruding towards the flow channel bottom plate 212, the third protrusion B31 is connected with the flow channel bottom plate 212, and the orthogonal projection of the third protrusion B31 on the sealing flat plate 211 does not overlap with the orthogonal projection of the flow channel groove A1 on the sealing flat plate 211. The area of the third support beam B3 except the third protrusion B31 has a gap with the flow channel bottom plate 212.

[0167] Optionally, the liquid cooling plate 210 further comprises: at least two fourth connecting pieces 215, the third support beam B3 is connected with the second support beam B2 through the fourth connecting pieces 215.

[0168] Optionally, the second support beam B2 further comprises: a fourth protrusion B24 protruding towards the third support beam B3, the fourth protrusion B24 has a cavity on the side away from the flow channel bottom plate 212, and the fourth protrusion B24 is overlapped with the third support beam B3 in the projection of the sealing flat plate 211. That is, the third protrusion B31 abuts with the part of the flow channel bottom plate 212 except the flow channel groove A1. Wherein, the third protrusion B31 can be a strip-shaped support boss, and the extension direction of the strip-shaped support boss is parallel to the first direction X.

[0169] Wherein, the part of the third support beam B3 overlapped with the fourth protrusion B24 in the projection has a first connecting hole H1, the fourth protrusion B24 has a second connecting hole H2 corresponding to the first connecting hole H1, and the fourth connecting piece 215 is connected with the flow channel bottom plate 212 after passing through the first connecting hole H1 and the corresponding second connecting hole H2.

[0170] In a possible implementation, as shown in Figure 7 and Figure 8 , the flow channel bottom plate 212 can have a fourth connecting hole H4, the sealing flat plate 211 can have a seventh connecting hole H7, and the fourth connecting piece 215 can continue to pass through the fourth connecting hole H4 of the flow channel bottom plate 212 and the seventh connecting hole H7 of the sealing flat plate 211, so as to connect the flow channel bottom plate 212 and the sealing flat plate 211 with the second support beam B2.

[0171] The fluid flow channel of the liquid cooling plate 210 will be described in detail below.

[0172] In some possible implementation, please refer to Figure 9 and Figure 14 , Figure 14 is a partitioned schematic diagram of a flow channel bottom plate provided by the embodiment of the present application, and the liquid cooling plate 210 further comprises: a liquid inlet component 216 and a liquid outlet component 217 in communication with the fluid flow channel, and the liquid inlet component 216 and the liquid outlet component 217 are both distributed on the same side of the flow channel bottom plate 212 in the first direction X. For example, the positions of the liquid inlet and the liquid outlet of the liquid cooling plate 210 are also arranged on the same side, so as to ensure that the cold and hot of the battery module 100 exist at the same time, and reduce the surface temperature difference of the flow channel plate.

[0173] The liquid cooling plate 210 has: an inlet flow channel area Q1 and an outlet flow channel area Q2 arranged along the second direction Y, the inlet flow channel area Q1 is closer to the liquid inlet component 216 in the second direction Y, and the outlet flow channel area Q2 is closer to the liquid outlet component 217 in the second direction Y.

[0174] The fluid flow channel includes a plurality of first main flow channels A11 and a plurality of first branch flow channels A12 distributed in the liquid inlet flow channel area Q1, and a plurality of second main flow channels A13 and second branch flow channels A14 distributed in the liquid outlet flow channel area Q2. The first main flow channel A11 communicates with the first branch flow channel A12, and the second main flow channel A13 communicates with the second branch flow channel A14.

[0175] The overall extension direction of the first main flow channel A11 and the second main flow channel A13 is parallel to the first direction X. That is, the overall extension direction of the first main flow channel A11 and the second main flow channel A13 is the length direction of the liquid cooling plate 210. For example, the overall extension direction of the first branch flow channel A12 and the first branch flow channel A12 can be parallel to the second direction Y, that is, the width direction of the liquid cooling plate 210.

[0176] In the embodiment of the present application, the distance between two adjacent first main flow channels A11 in the second direction Y is less than the sum of the widths of the two adjacent first main flow channels A11 in the second direction Y. That is, the spacing between the plurality of first main flow channels A11 is narrow, so that more first main flow channels A11 can be arranged in the liquid inlet flow channel area Q1.

[0177] In some possible implementations, the area of the projection of the flow channel groove A1 on the sealing flat plate 211 is greater than the area of the projection of the part of the flow channel bottom plate 212 other than the flow channel groove A1 on the sealing flat plate 211; the area of the projection of the flow channel groove A1 in the two liquid inlet flow channel areas Q1 on the sealing flat plate is greater than the area of the projection of the flow channel groove A1 in the liquid outlet flow channel area Q2 on the sealing flat plate 211.

[0178] In this way, in the liquid inlet flow channel area Q1, the flow channel arrangement spacing is small, more circulation loops are arranged, the heating or cooling of the battery is more uniform, and the temperature difference is reduced. The contact area of the cooling medium with the flow channel plate is larger, and higher heat dissipation efficiency can be provided.

[0179] For example, please refer to Figure 9 and Figure 15 , Figure 15 is Figure 9 A partial enlarged view of the C1 area of the flow channel bottom plate provided by the present application. The plurality of first main flow channels A11 distributed in each liquid inlet flow channel area Q1 can be divided into a plurality of groups of first main flow channels A11, and each group of first main flow channels A11 can include two first main flow channels A11 arranged in parallel. The directions of the cooling medium flowing in the two adjacent groups of first main flow channels A11 are opposite. For example, Figure 15The two groups of first main flow channels A11 are shown, and the arrow indicates the direction of the cooling medium flow. In this way, by arranging parallel double circulation loops in a smaller spacing, the flow resistance of the cooling liquid is smaller, the flow path of the cooling liquid is more optimal, the cooling efficiency is higher, and the uniform temperature of the battery during charging and discharging can be ensured, the temperature difference between the battery modules 100 is significantly reduced, and the heat dissipation performance is optimized.

[0180] In some possible implementation manners, reference can be made to Figure 14 and Figure 16 , Figure 16 is Figure 14 A structure diagram of a flow channel bottom plate provided by the application is shown. The number of liquid inlet flow channel areas Q1 is at least two. The liquid cooling plate 210 also has: at least two distribution areas Q3 corresponding to the at least two liquid inlet flow channel areas Q1, and the distribution areas Q3 are distributed on the side of the corresponding liquid inlet flow channel areas Q1 facing the liquid inlet component 216 in the first direction X. For example, as shown in Figure 14 , the number of liquid inlet flow channel areas Q1 is two, and the number of distribution areas Q3 is also two.

[0181] The fluid flow channel further includes: distribution flow channels A15 distributed in the distribution areas Q3, and the distribution flow channels A15 in the distribution areas Q3 are in communication with the first main flow channels A11 in the corresponding liquid inlet flow channel areas Q1.

[0182] For example, the distribution flow channels A15 can include: a plurality of distribution main flow channels A15-1, and a plurality of distribution branch flow channels A15-2 for communicating the plurality of distribution main flow channels A15-1, the overall extension direction of the distribution main flow channels A15-1 can be parallel to the first direction X, the overall extension direction of the distribution branch flow channels A15-2 can be parallel to the second direction Y, and the plurality of distribution main flow channels A15-1 correspond to the plurality of first main flow channels A11. One end of the plurality of distribution main flow channels A15-1 is in parallel connection, and is in communication with the liquid inlet component 216 of the liquid cooling plate 210; the other end of the plurality of distribution main flow channels A15-1 is in communication with the corresponding first main flow channels A11.

[0183] As shown in Figure 16 , for ease of description, the distribution main flow channels A15-1, the distribution branch flow channels A15-2, and the first main flow channels A11 shown by different line arrows and the direction of the cooling medium flow are in parallel connection. Among them, the number of distribution main flow channels A15-1 can be three, and the number of first main flow channels A11 in communication with the distribution area Q3 in one liquid inlet flow channel area Q1 can be two, and the two first main flow channels A11 are also in parallel connection.

[0184] In this way, the fluid flowing from the liquid inlet component 216 flows through the flow channel network A15 and then flows to the two liquid inlet flow channel areas Q1, so that the flow resistance between the liquid inlet component 216 and the liquid inlet flow channel area Q1 can be reduced, the flow rate of the cooling liquid in the fluid flow channel can be increased, and the cooling effect can be ensured. In addition, the plurality of first main flow channels A11 between each liquid inlet flow channel area Q1 can be arranged in parallel, so that the flow resistance of the flow channel in the liquid inlet flow channel area Q1 can also be reduced, and the flow rate of the cooling liquid in the liquid inlet flow channel area Q1 can be increased.

[0185] Optionally, the flow channel bottom plate 212 further has a plurality of third reinforcing ribs A2 distributed in the distribution area Q3. The third reinforcing ribs A2 can improve the strength of the flow channel bottom plate 212 in the distribution area Q3. The third reinforcing ribs A2 have auxiliary grooves that are not in communication with the flow channel grooves A1. For example, the auxiliary grooves and the flow channel grooves A1 can be integrally stamped and formed.

[0186] For example, in the case of brazing connection between the flow channel bottom plate 212 and the sealing flat plate 211, the flow channel bottom plate 212 can be provided with a plurality of exhaust holes H8 in the area other than the flow channel grooves A1. The exhaust holes H8 can not only exhaust the gas between the flow channel bottom plate 212 and the sealing flat plate 211, but also exhaust the excess solder between the flow channel bottom plate 212 and the sealing flat plate 211.

[0187] Optionally, in the second direction Y, the maximum distance between the liquid outlet flow channel area Q2 and the adjacent distribution area Q3 is greater than the maximum distance between the liquid outlet flow channel area Q2 and the adjacent liquid inlet flow channel area Q1. In addition, the part of the flow channel bottom plate 212 distributed between the liquid outlet flow channel area Q2 and the adjacent distribution area Q3 abuts against the sealing flat plate 211, so that the distribution area Q3 and the liquid outlet flow channel area Q2 can be isolated, the problem of flow between the distribution area Q3 and the liquid outlet flow channel area Q2 can be avoided, and the cooling effect of the liquid cooling plate 210 can be ensured.

[0188] Some possible implementation manners are described below with reference to Figure 14 and Figure 17 , Figure 17 is Figure 14 a partial enlarged view of the C3 area of the flow channel bottom plate provided by the application. The flow channel bottom plate 212 further has a plurality of turbulence convexes A3 distributed in the liquid outlet flow channel area Q2. The plurality of second main flow channels A13 and the plurality of second branch flow channels A14 are distributed around the plurality of turbulence convexes A3.

[0189] The side of the turbulence convex A3 facing the sealing flat plate 211 abuts against the side of the sealing flat plate 211 facing the flow channel bottom plate 212, and the side of the turbulence convex A3 away from the sealing flat plate 211 has a cavity.

[0190] The dense turbulence protrusions A3 are arranged in the liquid outlet flow channel area Q2 of the liquid cooling plate 210, and are used for turbulence of the cooling liquid. The turbulence protrusions A3 enhance the turbulence degree of the cooling liquid, improve the heat exchange efficiency, and further reduce the temperature difference. These structures can change the flow mode of the cooling liquid, increase the contact area and time of the cooling liquid with the flow channel wall surface, and compared with the liquid cooling plate in the laminar flow state without turbulence design, the contact of the cooling liquid with the flow channel wall surface is more sufficient in the turbulent flow state, the heat transfer is more efficient, so that more heat can be taken away, and the heat dissipation efficiency is significantly improved. It has been verified that the setting of the turbulence structure can effectively improve the heat dissipation effect.

[0191] In the liquid cooling system, if the cooling liquid flows unsmoothly, local gas or liquid accumulation may occur, that is, the gas and water accumulation phenomenon. The turbulence design can disrupt the flow state of the cooling liquid, so that the gas and liquid are more evenly distributed in the flow channel, avoiding local accumulation, and ensuring that the cooling liquid can flow smoothly, maintaining good heat dissipation performance.

[0192] Through the turbulence design, the flow rate and flow direction of the cooling liquid in the flow channel are changed, so that the cooling liquid can be more evenly distributed in the entire flow channel space, and more sufficient and uniform heat exchange with the heat generating part can be achieved. In this way, local overheating or overcooling can be avoided, and the heat exchange uniformity of the entire liquid cooling plate is improved.

[0193] Optionally, the plurality of turbulence protrusions A3 includes: a plurality of rows of first type turbulence protrusions A31 and a plurality of rows of second type turbulence protrusions A32 arranged alternately along the first direction X, one row of first type turbulence protrusions A31 includes: at least two first type turbulence protrusions A31 arranged along the second direction Y, and one row of second type turbulence protrusions A32 includes: at least two second type turbulence protrusions A32 arranged along the second direction Y. For example, the number of first type turbulence protrusions A31 in one row of first type turbulence protrusions A31 is four, and the number of second type turbulence protrusions A32 in one row of second type turbulence protrusions A32 is three.

[0194] Among them, at least two first type turbulence protrusions A31 in one row of first type turbulence protrusions A31 and at least two second type turbulence protrusions A32 in one row of second type turbulence protrusions A32 are arranged staggered in the second direction Y. In the embodiment of the present application, the turbulence effect is realized by the staggered arrangement of the turbulence protrusions A3, and the arrangement in the first direction X and the second direction Y can arrange more turbulence protrusions A3 in the liquid outlet flow channel area Q2, and provide better turbulence effect.

[0195] It should be noted that the staggered arrangement is not limited to each turbulence protrusion A3 in the two rows of turbulence protrusions A3 being staggered. As long as the two adjacent rows of turbulence protrusions A3 are not completely the same in number and are not arranged in parallel.

[0196] In some possible implementation manners, in each row of the turbulence convexes A3, the spacing between every two adjacent turbulence convexes A3 in the second direction Y is the same.

[0197] For two rows of the turbulence convexes A3 adjacent in the first direction X, the number of the turbulence convexes A3 in one row of the turbulence convexes A3 is greater than the number of the turbulence convexes A3 in the other row of the turbulence convexes A3. For example, the number of the first type of turbulence convexes A31 in one row of the first type of turbulence convexes A31 is greater than the number of the second type of turbulence convexes A32 in one row of the second type of turbulence convexes A32.

[0198] Optionally, in the first direction X, the size of the first type of turbulence convexes A31 is greater than the size of the second type of turbulence convexes A32. That is, the length of the first type of turbulence convexes A31 is greater. And / or, in the second direction Y, the size of at least part of the first type of turbulence convexes A31 is smaller than the size of the second type of turbulence convexes A32. That is, the width of at least part of the second type of turbulence convexes A32 is greater. And, the width of at least two second type of turbulence convexes A3 in the second direction Y is not equal.

[0199] In the embodiments of the present application, the flow channel bottom plate 212 forms the flow channel groove A1 and the turbulence convexes A3 by stamping; in other embodiments, the auxiliary groove of the third reinforcing rib A2 can also be formed by stamping. The stamping method can form a more complex and more delicate flow channel structure, which can make the cooling liquid more uniformly distributed in the liquid cooling plate 210 and fully contact with the heat generating components, thereby improving the heat dissipation efficiency. And the stamping process can realize high-precision size control, so that the size precision of the liquid cooling plate 210 is higher, and the consistency when mass-produced is better. This is very important to ensure the assembly precision with other parts and the stability of the heat dissipation effect.

[0200] For example, the flow channel bottom plate 212 and the sealing flat plate 211 in the embodiments of the present application are fixedly connected by brazing. Through the brazing process, the flow channel plate formed by the flow channel bottom plate 212 and the sealing flat plate 211 can obtain higher connection strength and better sealing performance, and can withstand higher pressure and vibration, thereby improving the reliability and service life of the liquid cooling plate 210.

[0201] For example, in the embodiments of the present application, the flow channel bottom plate 212 and the sealing flat plate 211 can be made of modified (MOD) aluminum alloy materials, such as aluminum-manganese alloy, such as AL-3003 MOD material. The MOD material can provide better performance, such as high hardness, high strength and high wear resistance, good toughness and corrosion resistance, processability and performance improvement through heat treatment.

[0202] Optionally, please refer to Figure 5 and Figure 18 , Figure 18is Figure 2 The provided is a bottom view of the battery plug-in box, and the liquid cooling plate 210 further comprises: a plurality of heat preservation plates 218 connected with the flow channel bottom plate 212 away from the side of the sealing flat plate 211. In the first direction X, one heat preservation plate 218 is distributed between two adjacent first support beams B1. That is, the heat preservation plate 218 is in contact with the part of the flow channel bottom plate 212 which is not covered by the support beam, that is, between the support beams arranged in the support frame 213, which can prevent condensation problems at the bottom of the flow channel bottom plate 212, thereby improving the safety of the battery plug-in box 000.

[0203] Optionally, please refer to Figure 2 and Figure 19 , Figure 19 is Figure 2 The provided is a front view of the battery plug-in box, and the box cover 220 comprises: a top cover 221, and a side plate 222 fixedly connected with the outer edge of the top cover 221. The side plate 222 is annular, and the side plate 222 is sealingly connected with the liquid cooling plate 210 away from the top cover 221. The side plate 222 has a first opening K1 and a second opening K2 in communication with the cavity, and the first opening K1 and the second opening K2 are distributed on the same side of the battery plug-in box 000 in the first direction X. The top cover 221 and the side plate 222 can be an integral structure, for example, the box cover 220 can be manufactured by a stamping forming process.

[0204] Illustratively, the material of the box cover 220 can be a hot-dip galvanized steel sheet (SGCC), which has good corrosion resistance, can avoid rust and corrosion on the surface of the steel material, prolong the service life of the battery plug-in box 000, and is suitable for various use environments. The hot-dip galvanized steel sheet also has good forming performance, so it can be processed into various shapes by cold bending, shearing, stamping and the like, meeting different design and manufacturing requirements of the box cover 220. The hot-dip galvanized steel sheet also has good weldability and can be processed by various welding methods, facilitating connection and assembly with the liquid cooling plate 210. The hot-dip galvanized steel sheet has high strength and can resist external impact, thereby improving the protection effect of the box cover 220 on the battery module 100.

[0205] Therefore, for the case of using a metal material for the box cover 220, the embodiments of the present application can be provided with a second insulating sheet 700 between the box cover 220 and the battery module 100, which can play an insulating protection role on the top of the battery module 100. Illustratively, the second insulating sheet 700 has an extension on both sides in the second direction Y extending in the thickness direction of the battery plug-in box 000, which can facilitate the clamping of the second insulating sheet 700 on the plurality of battery modules 100, thereby improving the structural stability and avoiding misalignment.

[0206] The battery plug-in box 000 further comprises a sealing cover plate 400, an interface cover plate 500, and a plurality of functional modules 600.

[0207] The plurality of functional modules 600 are located in the cavity and distributed at the position of the first opening K1, and at least one functional module 600 is connected with the battery module 100. The plurality of functional modules 600 are centrally arranged at the first opening K1, which can facilitate the electrical connection of the functional modules 600 and avoid the size of the electrical connecting member being too large. The plurality of functional modules 600 can include but are not limited to a fuse 600a, a battery management system 600c, a composite detection module 600d, and a fire extinguishing module 600e.

[0208] The fuse 600a is connected with the input row 121 of the last battery module 100. Figure 2 Taking the battery plug-in box 000 shown in the figure as an example, the input row 121 of the last battery module 100 faces the first opening K1, and the input row 121 and the fuse 600a can be electrically connected through a copper row with a small size.

[0209] The battery management system 600c can adopt an active balancing technology. The active balancing technology can transfer the electric quantity of the battery monomer 110 with more electric quantity to the battery monomer 110 with less electric quantity, so that the electric quantity of each battery monomer 110 in the battery module 100 is more balanced, thereby improving the overall available electric quantity of the battery module 100, avoiding the limitation of the use of the entire battery module 100 due to the low electric quantity of part of the battery monomers 110, and improving the utilization rate of the battery. The active balancing technology also has the characteristics of reducing overcharging and overdischarging, improving the charging and discharging efficiency, enhancing the stability and safety of the battery pack, etc.

[0210] The composite detection module 600d is used for detecting combustible gas. The composite detection module 600d integrates multiple detectors, such as a smoke detector, a temperature detector, and a gas detector, etc., which can reduce the number of devices and the installation space. In this way, the composite detection module 600d can simultaneously detect multiple combustible gases and accurately identify the concentration of the target gas, thereby avoiding the misjudgment that may occur when only a single gas detector is used. The composite detection module 600d can also monitor the changes of the combustible gas concentration and other related parameters in real time. Once the gas concentration abnormally increases or other parameters exceed the normal range, a warning signal can be quickly sent out, and intervention can be performed. Therefore, the composite detection module 600d can improve the efficiency and accuracy of fire prevention.

[0211] The composite detection module 600d can be in communication connection with the battery management system 600c and the fire extinguishing module 600e. When the composite detection module 600d detects an abnormal situation, for example, the concentration of the target gas is greater than the set threshold, a signal is sent to the battery management system 600c and the fire extinguishing module 600e, and then the battery management system 600c can cut off the power in response to the signal, and the fire extinguishing module 600e can be automatically started in response to the signal, so as to effectively prevent the expansion of thermal runaway.

[0212] The fire extinguishing module 600e can be an aerosol fire extinguishing module. After triggering the fire extinguishing module 600e to start, the fire extinguishing module 600e will spray aerosol fire extinguishing medium, which can effectively isolate oxygen and carry away heat, so as to achieve the effect of cooling, thereby quickly extinguishing the fire and preventing rekindling. The aerosol fire extinguishing module has the characteristics of high fire extinguishing efficiency, full flooding fire extinguishing, oxygen isolation and cooling, good safety, small size, and normal pressure operation.

[0213] The fire extinguishing module 600e realizes the fire extinguishing effect inside the box body 200. The application can also be provided with a nozzle on the sealing cover plate 400, so that the fire extinguishing medium can be sprayed into the box body 200 from the outside of the battery insertion box 000 through the nozzle. In this way, the fire extinguishing efficiency can be further improved, thereby improving the safety of the battery insertion box 000.

[0214] In the application, the fuse 600a, the composite detection module 600d and the fire extinguishing module 600e can be installed on the mounting bracket, and the mounting bracket is locked to the liquid cooling plate 210 by bolts, so as to improve the structural stability of the battery insertion box 000.

[0215] The sealing cover plate 400 is sealingly connected with the side plate 222 at the first opening K1. The sealing cover plate 400 is a detachable cover plate, which can facilitate maintenance and replacement of the plurality of functional modules 600 through the first opening K1. For example, a ring-shaped waterproof sealing silica gel pad can be arranged between the sealing cover plate 400 and the side plate 222, so as to improve the sealing and waterproof effect of the battery insertion box 000, thereby improving the applicability of the battery insertion box 000 in various application environments.

[0216] Optionally, the sealing cover plate 400 includes a cover plate body 410 and a ring-shaped connecting ring plate 420, the connecting ring plate 420 is distributed around the cover plate body 410 and is fixedly connected with the outer edge of the cover plate body 410, and the connecting ring plate 420 is fixedly connected with the side plate 222 at the first opening K1. The connecting ring plate 420 can be connected with the side plate 222 by bolts or other connecting members.

[0217] The sealing cover plate 400 protrudes from the side of the connecting ring plate 420 away from the side plate 222 in a direction perpendicular to the body 410 of the cover plate, and the side of the sealing cover plate 400 facing the side plate 222 has a bearing groove, and the part of the functional module 600 extending through the first opening K1 is located in the bearing groove. The bearing groove of the sealing cover plate 400 can be used to accommodate at least part of the functional module 600, avoiding the increase of the overall size of the battery box 200 to accommodate the functional module 600, so as to improve the compactness of the structure arrangement in the battery box 200. For example, the battery management system 600c can be installed in the bearing groove of the sealing cover plate 400.

[0218] The interface cover plate 500 has a plurality of interfaces 510 connected with the functional module 600. The plurality of interfaces 510 are used for external connection, and can include but not limited to: a total input end 511, a total output end 512, and a low-voltage communication interface 513, wherein the battery management system 600c is connected with the low-voltage communication interface 513. The manual maintenance switch 600b can also be installed on the interface cover plate 500, so as to quickly cut off the circuit when a fault, an anomaly or emergency maintenance is needed, and the total output end 512 is connected with the fuse 600a through the manual maintenance switch 600b.

[0219] The interface cover plate 500 is sealingly connected with the side plate 222 at the second opening K2. For example, an annular waterproof sealing silica gel pad can be arranged between the interface cover plate 500 and the side plate 222, so as to improve the sealing and waterproof effect of the battery plug-in box 000, and further improve the applicability of the battery plug-in box 000 in various application environments.

[0220] Optionally, the side of the top cover 221 away from the liquid cooling plate 210 has a plurality of convex blocks 221a, and each convex block 221a has a groove communicating with the cavity on the side facing the liquid cooling plate 210. The plurality of convex blocks 221a can form reinforcing ribs, so as to improve the structural strength of the top cover 221 to resist external impact. For example, the plurality of convex blocks 221a can be arranged in an array in the first direction X and the second direction Y, and the shape of the convex block 221a can be hexagonal, so as to improve the strength of the formed reinforcing ribs. The plurality of convex blocks 221a can be manufactured by a stamping forming process.

[0221] Optionally, the battery plug-in box 000 further comprises a plurality of explosion-proof pressure relief valves 800. In the case of thermal runaway of the battery plug-in box 000, the inside of the box 200 will generate a large amount of gas, and the exhaust speed of one explosion-proof pressure relief valve 800 is limited. By arranging a plurality of explosion-proof pressure relief valves 800, the pressure relief efficiency can be improved, and the harm caused by thermal runaway can be reduced. Moreover, if one explosion-proof pressure relief valve 800 fails to work normally, the other explosion-proof pressure relief valves 800 can still function, ensuring that the pressure inside the battery plug-in box 000 can be released in time to avoid serious safety accidents. Exemplarily, the number of explosion-proof pressure relief valves 800 can be two, but the present application is not limited thereto.

[0222] The plurality of explosion-proof pressure relief valves 800 are installed on both sides of the side plate 222 in the second direction Y, and the plurality of explosion-proof pressure relief valves 800 are all distributed near the first opening K1 and the second opening K2 in the first direction X. This helps to more accurately control the pressure balance inside the battery plug-in box 000, making the pressure distribution more uniform and reducing the impact of local high or low pressure on battery performance and safety. Under different working conditions or environments, such as different temperatures, humidities, charge and discharge rates, etc., the plurality of explosion-proof pressure relief valves 800 can also work cooperatively according to the actual situation to better meet the pressure relief needs of the battery plug-in box 000 and ensure the stable operation of the battery plug-in box 000.

[0223] In the embodiments of the present application, the battery plug-in box can be applied to a battery energy storage system, for example, an energy storage prefabricated cabin. At present, for a 20-foot high cabinet standard prefabricated cabin capable of achieving 5 megawatt-hour (Mwh) energy storage, the battery plug-in box used is usually a battery plug-in box composed of battery monomers with a capacity of 314 ampere-hours (Ah). In a related technology, the grouping mode of the battery monomers in the battery plug-in box is 1P104S, that is, the battery plug-in box includes 104 battery monomers, and the battery plug-in box is composed of 8 battery modules, and each battery module includes 13 battery monomers. Due to the excessive number of battery monomers and battery modules, the consistency of the performance of the battery monomers is poor, and the thermal management of the battery plug-in box is complex.

[0224] In some possible implementations, the present application can make the number of battery modules and the number of battery monomers in the battery plug-in box smaller by increasing the capacity of a single battery monomer. For example, in the embodiments of the present application, the capacity of a single battery monomer can be increased to 1000 Ah, and the battery plug-in box can be composed of 10 battery modules, and each battery module can include 10 battery monomers. Figure 2The battery plug-in box 000 shown is an example of a battery plug-in box 000 in which the battery cells 110 are grouped in a 1P52S manner, that is, 52 battery cells are included in one battery plug-in box 000, and the battery plug-in box 000 is composed of 4 battery modules 100, each of which includes 13 battery cells. On the one hand, this can improve the consistency of the performance of the battery cells 110, so as to facilitate the management of the performance of each battery cell 110. On the other hand, this can reduce heat accumulation and reduce the temperature difference between the battery cells 110, and can also simplify the heat conduction path between the battery cells 110, so as to facilitate the thermal management of the battery plug-in box 000.

[0225] In summary, the embodiments of the present application provide a battery plug-in box, in which a plurality of battery modules are arranged along a first direction and a second direction, the first direction being the arrangement direction of a plurality of battery cells in the battery module. The plurality of battery modules are connected in series by a first connecting piece and a second connecting piece, wherein the first connecting piece is located between two adjacent battery modules in the first direction and connected with two transmission rows in the two battery modules. By setting the extension direction of the first connecting piece parallel to the first direction, the extension direction of the first connecting piece is the same as the arrangement direction of the plurality of battery cells. This can make the size of the first connecting piece smaller, not only can improve the tightness of the plurality of battery modules arranged in the first direction, thereby improving the energy density of the battery plug-in box, but also can improve the stability of the first connecting piece when the battery plug-in box is subjected to external impact or extrusion, thereby improving the reliability of the battery plug-in box.

[0226] In the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are in an "or" relationship.

[0227] It should be noted that in the drawings, the sizes of the layers and regions can be exaggerated for clarity. Also, it can be understood that when an element or layer is referred to as being "on" another element or layer, it can be directly on the other element or layer, or intervening layers can be present. In addition, it can be understood that when an element or layer is referred to as being "under" another element or layer, it can be directly under the other element or layer, or one or more intervening layers or elements can be present. In addition, it can also be understood that when a layer or element is referred to as being "between" two layers or elements, it can be the only layer or element between the two layers or elements, or there can be one or more intervening layers or elements. Similar reference numerals indicate similar elements throughout the specification.

[0228] In the present application, the terms "first", "second", "third", "fourth", "fifth", "sixth" and "seventh" are only for descriptive purpose, and cannot be understood as indicating or implying relative importance. The term "a plurality of" refers to two or more, unless otherwise expressly specified.

[0229] The above only describes optional embodiments of the present application, and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cabinet, characterized in that, The battery plug-in box comprises a box body and a first connecting piece, a second connecting piece and a plurality of battery modules in the box body; The plurality of battery modules are arranged in a first direction and a second direction intersecting with each other; the battery module comprises an integrated busbar and a plurality of battery cells arranged in the first direction, the integrated busbar is located on the plurality of battery cells and the plurality of battery cells are connected through the integrated busbar, and the integrated busbar has two transmission buses distributed on both sides of the battery module in the first direction; The first connecting piece is located between two adjacent battery modules in the first direction and connected with two transmission buses in the two battery modules; the second connecting piece is located between two adjacent battery modules in the second direction and connected with two transmission buses in the two battery modules; and the plurality of battery modules are connected in series through the first connecting piece and the second connecting piece; The extension direction of the first connecting piece is parallel to the first direction; The box body comprises a liquid cooling plate and a box cover buckled on the liquid cooling plate; The liquid cooling plate comprises a sealing flat plate, a flow channel bottom plate support frame, a liquid inlet component and a liquid outlet component; the sealing flat plate is located on the side of the battery module away from the box cover; the flow channel bottom plate is connected with the side of the sealing flat plate away from the battery module, the flow channel bottom plate has a plurality of flow channel grooves recessed towards the direction away from the sealing flat plate, the sealing flat plate and the plurality of flow channel grooves are used to enclose a fluid flow channel; the liquid inlet component and the liquid outlet component are both in communication with the fluid flow channel and are both distributed on the same side of the flow channel bottom plate in the first direction; the liquid cooling plate has a liquid inlet flow channel area and a liquid outlet flow channel area arranged in the second direction, and the liquid inlet flow channel area is closer to the liquid inlet component in the second direction; The fluid flow channel comprises a plurality of first main flow channels and a plurality of first branch flow channels distributed in the liquid inlet flow channel area, and the first main flow channels are in communication with the first branch flow channels; the plurality of first main flow channels are divided into a plurality of groups of first main flow channels, each group of first main flow channels comprises two first main flow channels, and the directions of the cooling medium flowing in adjacent two groups of first main flow channels are opposite; wherein the overall extension direction of the first main flow channels is parallel to the first direction.

2. The battery cabinet of claim 1, wherein, The plurality of battery modules comprise a first battery module and a second battery module, and the first battery module and the second battery module are adjacent in the first direction; The transmission bus on the side of the first battery module facing the second battery module is a first transmission bus, and the transmission bus on the side of the second battery module facing the first battery module is a second transmission bus; the distribution position of the first transmission bus in the second direction is the same as that of the second transmission bus in the second direction; Wherein, the two ends of the first connecting piece are connected with the first transmission bus and the second transmission bus respectively.

3. The battery cabinet of claim 2, wherein, The battery monomer has a first pole and a second pole arranged in the second direction; The battery monomer closest to the second battery module in the first battery module is a first battery monomer, and the battery monomer closest to the second battery module in the second battery module is a second battery monomer; the second pole of the first battery monomer and the first pole of the second battery monomer are oppositely arranged in the first direction; The first transmission row is connected with the second pole of the first battery monomer, and the second transmission row is connected with the first pole of the second battery monomer.

4. The battery cabinet of claim 3, wherein, The integrated busbar further comprises a plurality of connection rows; for two adjacent battery monomers in the same battery module, the first pole of one battery monomer and the second pole of the other battery monomer are oppositely arranged in the first direction, and the two ends of the connection row are connected with the first pole of one battery monomer and the second pole of the other battery monomer respectively.

5. The battery cabinet of claim 1, wherein, The plurality of battery modules comprises a third battery module and a fourth battery module, and the third battery module and the fourth battery module are adjacently distributed in the second direction; the third battery module is the outermost battery module in a row of battery modules arranged in the first direction, and the transmission row on the side away from other battery modules in the row of battery modules is a third transmission row; the fourth battery module is the outermost battery module in another row of battery modules arranged in the first direction, and the transmission row on the side away from other battery modules in the other row of battery modules is a fourth transmission row; The two ends of the second connecting piece are connected with the third transmission row and the fourth transmission row respectively.

6. The battery cabinet according to any one of claims 1 to 5, characterized in that The transmission row on the side away from the adjacent battery module of the first battery module in the plurality of battery modules is used for connecting with the total input end of the battery plug-in box; the transmission row on the side away from the adjacent battery module of the last battery module in the plurality of battery modules is used for connecting with the total output end of the battery plug-in box.

7. The battery cabinet according to any one of claims 1 to 5, characterized in that The battery module further comprises two end plates, and the two end plates are respectively located on the two sides of the plurality of battery monomers in the first direction; The end plate has a lifting hole, and the lifting hole is distributed on the side of the end plate facing the integrated busbar.

8. The battery cabinet according to any one of claims 1 to 5, characterized in that The liquid cooling plate and the box cover are sealingly connected; The plurality of battery modules are located on the liquid cooling plate and are distributed in the cavity surrounded by the liquid cooling plate and the box cover.

9. The battery cabinet of claim 8, wherein, The support frame is connected with the side of the flow channel bottom plate away from the sealing flat plate; the support frame comprises a frame body and a plurality of first support beams; the plurality of first support beams are arranged in the first direction and are fixedly connected with the frame body; Each first support beam has at least two first protrusions protruding towards the flow channel bottom plate, the first protrusions abut against the flow channel bottom plate, and the first protrusions in the projection on the sealing flat plate do not overlap with the flow channel recess in the projection on the sealing flat plate; there is a gap between the area of the first support beam other than the first protrusions and the flow channel bottom plate.

10. The battery cabinet of claim 9, wherein, The first support beam comprises a first support beam body and the first protrusion, and a cavity is formed on a side of the first protrusion away from the flow channel bottom plate. The first support beam body and the first protrusion are integrally formed by stamping.

11. The battery cabinet of claim 9, wherein, The first support beam further comprises a plurality of first reinforcing ribs extending along the second direction, and the plurality of first reinforcing ribs are arranged along the first direction. The at least two first protrusions comprise two rows of the first protrusions arranged along the first direction, each row of the first protrusions comprises at least one first protrusion, and the plurality of first reinforcing ribs are distributed between the two rows of the first protrusions.

12. The battery cabinet of claim 9, wherein, The support frame further comprises at least one second support beam fixedly connected with the frame body, and the second support beam is distributed between two adjacent first support beams in the first direction. Each second support beam has at least two second protrusions protruding towards the flow channel bottom plate, the second protrusions are connected with the flow channel bottom plate, and the second protrusions do not overlap with the flow channel groove in the orthogonal projection of the sealing flat plate; and a gap is formed between the second support beam and the flow channel bottom plate.

13. The battery cabinet of claim 12, wherein, The second support beam comprises a second support beam body and the second protrusion, and a cavity is formed on a side of the second protrusion away from the flow channel bottom plate. The second support beam body and the second protrusion are integrally formed by stamping.

14. The battery cabinet of claim 12, wherein, The second support beam further comprises a plurality of second reinforcing ribs extending along the second direction, and the plurality of second reinforcing ribs are arranged along the first direction. The at least two second protrusions are arranged along the second direction, and at least part of the second reinforcing ribs are distributed between two adjacent second protrusions.

15. The battery cabinet of claim 12, wherein, The liquid cooling plate further comprises at least two third connecting members, and the second protrusions are connected with the flow channel bottom plate through the third connecting members.

16. The battery cabinet of claim 12, wherein, The support frame further comprises at least one third support beam, the third support beam extends in parallel with the first direction, the third support beam is located on a side of the first support beam and the second support beam away from the flow channel bottom plate, and the third support beam is fixedly connected with the first support beam and the second support beam. The third support beam has a third protrusion protruding towards the flow channel bottom plate, the third protrusion is connected with the flow channel bottom plate, and the third protrusion does not overlap with the flow channel groove in the orthogonal projection of the sealing flat plate; and a gap is formed between the third support beam and the flow channel bottom plate.

17. The battery cabinet of claim 16, wherein, The liquid cooling plate further comprises at least two fourth connecting members, and the third support beam is connected with the second support beam through the fourth connecting members.

18. The battery cabinet of claim 17, wherein, The second support beam further comprises a fourth protrusion protruding towards the third support beam, a cavity is formed on a side of the fourth protrusion away from the flow channel bottom plate, and the fourth protrusion overlaps with the third support beam in the orthogonal projection of the sealing flat plate. The part of the third support beam that overlaps with the fourth protrusion in orthographic projection has a first connecting hole, the fourth protrusion has a second connecting hole corresponding to the first connecting hole, and the fourth connecting piece is connected to the flow channel bottom plate after passing through the first connecting hole and the corresponding second connecting hole.

19. The battery cabinet according to any of claims 9-18, characterized by The fluid flow channel further comprises a plurality of second main flow channels and second branch flow channels distributed in the liquid outlet flow channel area; the second main flow channels communicate with the second branch flow channels; The overall extension direction of the second main flow channels is parallel to the first direction.

20. The battery cabinet of claim 19, wherein, The number of the liquid inlet flow channel areas is at least two; the liquid cooling plate further comprises at least two distribution areas corresponding to the at least two liquid inlet flow channel areas, and the distribution areas are distributed on the side of the corresponding liquid inlet flow channel areas facing the liquid inlet component in the first direction. The fluid flow channel further comprises a distribution flow channel distributed in the distribution area, and the distribution flow channel in the distribution area communicates with the first main flow channel in the corresponding liquid inlet flow channel area.

21. The battery cabinet of claim 20, wherein, The flow channel bottom plate further comprises a third reinforcing rib distributed in the distribution area, and the third reinforcing rib has an auxiliary groove that does not communicate with the flow channel groove.

22. The battery cabinet of claim 20, wherein, In the second direction, the maximum distance between the liquid outlet flow channel area and the adjacent distribution area is greater than the maximum distance between the liquid outlet flow channel area and the adjacent liquid inlet flow channel area.

23. The battery cabinet of claim 19, wherein, The flow channel bottom plate further comprises a plurality of turbulence convex hulls distributed in the liquid outlet flow channel area; the plurality of second main flow channels and the plurality of second branch flow channels are distributed around the plurality of turbulence convex hulls; The side of the turbulence convex hull facing the sealing flat plate abuts against the side of the sealing flat plate facing the flow channel bottom plate, and the side of the turbulence convex hull away from the sealing flat plate has a cavity.

24. The battery cabinet of claim 23, wherein, The plurality of turbulence convex hulls comprise a plurality of rows of first-type turbulence convex hulls and a plurality of rows of second-type turbulence convex hulls arranged alternately in the first direction, one row of the first-type turbulence convex hulls comprises at least two first-type turbulence convex hulls arranged in the second direction, and one row of the second-type turbulence convex hulls comprises at least two second-type turbulence convex hulls arranged in the second direction; At least two first-type turbulence convex hulls in one row of the first-type turbulence convex hulls are arranged staggeredly in the second direction with at least two second-type turbulence convex hulls in one row of the second-type turbulence convex hulls.

25. The battery cabinet of claim 24, wherein, In the first direction, the size of the first-type turbulence convex hull is greater than the size of the second-type turbulence convex hull, and in the second direction, the size of at least part of the first-type turbulence convex hull is smaller than the size of the second-type turbulence convex hull.

26. The battery cabinet of claim 19, wherein, The liquid cooling plate further comprises a plurality of heat preservation plates connected to the side of the flow channel bottom plate away from the sealing flat plate; in the first direction, one heat preservation plate is distributed between two adjacent first support beams.

27. The battery cabinet of claim 8, wherein, The box cover comprises a top cover and a side plate fixedly connected with the outer edge of the top cover; the side plate is annular, and the side plate is sealingly connected with the liquid cooling plate on the side away from the top cover; the side plate has a first opening and a second opening communicating with the cavity, and the first opening and the second opening are distributed on the same side of the battery plug-in box in the first direction; The battery plug-in box further comprises a sealing cover plate, an interface cover plate and a plurality of functional modules; The plurality of functional modules are located in the cavity and distributed at the positions of the first openings, and at least one of the functional modules is connected with the battery module; the sealing cover plate is sealingly connected with the side plate at the first opening; the interface cover plate has a plurality of interfaces connected with the functional modules, and the interface cover plate is sealingly connected with the side plate at the second opening.

28. The battery cabinet of claim 27, wherein, The sealing cover plate comprises a cover plate body and an annular connecting ring plate distributed around the cover plate body and fixedly connected with the outer edge of the cover plate body, and the connecting ring plate is fixedly connected with the side plate at the first opening; In the direction perpendicular to the cover plate body, the side of the sealing cover plate away from the side plate protrudes from the side of the connecting ring plate away from the side plate, and the side of the sealing cover plate toward the side plate has a bearing groove, and the part of the functional module protruding through the first opening is located in the bearing groove.

29. The battery cabinet according to claim 27 or 28, characterized in that, The top cover has a plurality of convexities on the side away from the liquid cooling plate, and each convexity has a recess on the side toward the liquid cooling plate and communicating with the cavity.

30. The battery cabinet according to claim 27 or 28, characterized in that, The battery plug-in box further comprises a plurality of explosion-proof pressure relief valves installed on both sides of the side plate in the second direction, and the plurality of explosion-proof pressure relief valves are distributed close to the positions of the first openings and the second openings in the first direction.

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