Integrated structure of liquid cooling plate and battery frame beam and CTC battery system

Abstract

The utility model provides a liquid cooling plate and battery frame beam integrated structure and CTC battery system, the integrated structure comprises a liquid cooling plate and a battery frame beam, the battery frame beam comprises a plurality of cross beams arranged at intervals and a plurality of longitudinal beams arranged at intervals, the plurality of cross beams and the plurality of longitudinal beams form a lattice structure, and the plurality of cross beams and the plurality of longitudinal beams are arranged in the lattice structure. And the cold liquid plate is integrally arranged at the bottom of the frame structure. According to the utility model, the liquid cooling plate and the battery frame beam are integrated, and the liquid cooling plate is applied to a CTC battery system in which a battery and a vehicle body chassis are integrated. And the integrated structure of the cold plate and the battery frame beam is used for accommodating the battery cell, and the battery cell is arranged on the vehicle chassis through the connection of the integrated structure of the cold plate and the battery frame beam and the vehicle chassis. Compared with the prior art, the side column collision resistance of the chassis and the battery system is enhanced while the cooling of the battery core is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy vehicles, and in particular to an integrated structure of a liquid cooling plate and a battery frame beam and a CTC battery system. Background Art

[0002] In a general CTC battery system where the battery is integrated with the vehicle chassis, a brazed liquid cooling plate is arranged at the bottom of the battery frame beam, and the brazed liquid cooling plate is connected to the bottom of the battery frame beam by riveting or screwing. At the same time, in order to solve the strength problem of the battery system side column collision, an additional reinforcing beam is required at the bottom of the liquid cooling plate. This structure requires a large Z-direction layout space, a large structural component weight, and a high cost. Utility Model Content

[0003] In order to solve the above problems, the utility model provides an integrated structure of a liquid cooling plate and a battery frame beam, including a liquid cooling plate and a battery frame beam, the battery frame beam including a plurality of spaced-apart cross beams and a plurality of spaced-apart longitudinal beams, the plurality of the cross beams and the plurality of the longitudinal beams forming a lattice structure, the liquid cooling plate being integrally arranged at the bottom of the lattice structure.

[0004] Preferably, a plurality of longitudinal beams are vertically connected between the two transverse beams, and the plurality of longitudinal beams include two side longitudinal beams and at least one middle longitudinal beam, and the middle longitudinal beam is located between the two side longitudinal beams.

[0005] Preferably, the liquid cooling plate comprises a plurality of independently arranged cold plates, and the plurality of cold plates are laid along the length direction of the crossbeam; the two sides of any one of the middle longitudinal beams are respectively connected to a cold plate, and the two side longitudinal beams are respectively connected to the outer sides of the cold plates on the two sides.

[0006] Preferably, the side longitudinal beam includes a longitudinal beam body and a boss, the boss is integrally arranged at the inner lower end of the longitudinal beam body, the lower surface of the boss is flush with the lower end surface of the longitudinal beam body and the lower surface of the cold plate on the corresponding side, the upper surface of the boss is flush with the upper surface of the cold plate on the side, and the side surface of the boss is fixedly connected to the side surface of the cold plate on the side.

[0007] Preferably, the middle longitudinal beam is a T-shaped structure, which includes a longitudinal beam body and two bosses, the two bosses are respectively integrally arranged at the lower ends of both sides of the longitudinal beam body, the lower surfaces of the two bosses are respectively flush with the lower end surface of the longitudinal beam body and the lower surface of the cold plate on the corresponding side, the upper surfaces of the two bosses are respectively flush with the upper surfaces of the cold plate on the corresponding side, and the side surfaces of the two bosses are respectively fixedly connected to the side surfaces of the cold plate on the corresponding side.

[0008] Preferably, the liquid cooling plate further comprises a total liquid inlet pipe and a total liquid outlet pipe;

[0009] Each of the cold plates comprises a liquid inlet and a liquid outlet, all the liquid inlets are connected to the main liquid inlet pipe, and all the liquid outlets are connected to the main liquid outlet pipe.

[0010] Preferably, the cold plate includes a cold plate body and a first current collector and a second current collector arranged at both ends of the cold plate body, the cold plate body includes a liquid inlet channel and a liquid outlet channel distributed up and down, the liquid inlet channel and the liquid outlet channel are connected in series through the first current collector; a liquid inlet chamber and a liquid outlet chamber are provided in the second current collector, the liquid inlet chamber is connected with the liquid inlet channel, and the liquid inlet port is provided on the liquid inlet chamber; the liquid outlet chamber is connected with the liquid outlet channel, and the liquid outlet port is provided on the liquid outlet chamber.

[0011] Preferably, the cross beam, the longitudinal beam and the cold plate are all extruded.

[0012] Preferably, the liquid inlet channel and the liquid outlet channel both include a plurality of channel holes.

[0013] Preferably, the lower end surface of the crossbeam is fixedly connected to the upper end surface of the liquid cooling plate.

[0014] Preferably, a mounting support column is provided at the junction of the cross beam and the longitudinal beam, and the mounting support column is fastened to the chassis frame by bolts.

[0015] Preferably, the mounting support column is a cylindrical shaft structure, which includes an upper cylindrical shaft portion and a lower cylindrical shaft portion coaxially arranged up and down, and the outer diameter of the upper cylindrical shaft portion is greater than the outer diameter of the lower cylindrical shaft portion; the mounting support column is provided with a through hole, and the through hole penetrates the upper cylindrical shaft portion and the lower cylindrical shaft portion;

[0016] The cross beam is provided with a mounting hole, and the mounting hole is located above the longitudinal beam; the mounting hole comprises an upper hole portion, a middle hole portion and a lower hole portion coaxially arranged from top to bottom, the aperture of the lower hole portion is larger than the aperture of the upper hole portion, and the aperture of the upper hole portion is larger than the aperture of the middle hole portion;

[0017] The lower cylindrical shaft portion extends into the upper hole portion, and the lower cylindrical shaft portion and the upper hole portion are interference fit; the outer diameter of the upper cylindrical shaft portion is larger than the hole diameter of the upper hole portion, and the lower surface of the upper cylindrical shaft portion is in contact with the upper surface of the crossbeam;

[0018] The bolt comprises a head and a rod, wherein the head is located in the lower hole, and the rod sequentially passes through the middle hole and the through holes of the mounting support column and is fastened to the chassis frame.

[0019] Preferably, the liquid cooling plate and the battery frame beam are integrally extruded.

[0020] The utility model also provides a CTC battery system, characterized in that it includes a battery cover, a chassis frame of a vehicle, the above-mentioned integrated structure and a battery bottom plate, the upper and lower ends of the chassis frame form a closed chassis internal space for accommodating the battery by connecting the battery cover and the battery bottom plate, and the integrated structure of the liquid cooling plate and the battery frame beam is arranged in the chassis internal space.

[0021] Compared with the prior art, the utility model has the following technical effects:

[0022] 1. The utility model provides an integrated structure of a liquid cooling plate and a battery frame beam, which integrates the liquid cooling plate and the battery frame beam into one, and is applied to a CTC battery system in which the battery is integrated with the vehicle chassis. The integrated structure of the cold plate and the battery frame beam is used to accommodate battery cells, and the battery cells are arranged on the vehicle chassis through the connection between the integrated structure of the cold plate and the battery frame beam and the vehicle chassis. Compared with the prior art, the utility model does not need to set an additional reinforcing beam at the bottom of the liquid cooling plate. While ensuring the cooling of the battery cells, it enhances the side column collision resistance of the chassis and the battery system, saves Z-direction arrangement space, reduces the weight of structural parts, and reduces costs.

[0023] 2. The utility model replaces the traditional brazed cold plate with an extruded aluminum profile cold plate, which saves costs. The extruded profile cold plate is integrated with the battery frame beam, omitting the traditional frame beam bottom plate (the traditional solution frame beam + bottom plate + cold plate structure), thereby achieving weight reduction and cost reduction.

[0024] 3. The extruded cold plate is integrated with the battery frame beam to achieve better strength. While improving the side column collision performance (when the side column collides, the bottom cold plate, as a strong whole, can participate in the collision energy absorption as a beam as a whole), it can also improve the structural strength of the liquid cooling plate supporting the battery cell (the one-piece brazed liquid cooling plate in the prior art uses 3 series aluminum, which has a soft material and weak structural strength, and is connected to the longitudinal and transverse beams by screwing or welding. The extruded aluminum profile of the utility model uses 6 series aluminum, which is extruded integrally with the longitudinal and transverse beams, does not require additional connecting structure, has high overall structural strength, and has high load-bearing capacity).

[0025] 4. The longitudinal beam is provided with a boss structure, and the cold plate and the overlap are welded, so that the bottom side of the battery cell can be placed on the boss, which can ensure that most of the weight of the battery cell is borne by the longitudinal beam, thereby improving the reliability of the system;

[0026] 5. Each liquid plate is provided with a liquid inlet channel and a liquid outlet channel to make cooling more uniform;

[0027] 6. The mounting support column is inserted into the beam, and the structure is simple and reliable.

[0028] 7. A cavity is set on the longitudinal beam to improve the thermal insulation performance of the cold plate.

[0029] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0031] Figure 1 It is an assembly diagram of a CTC battery system provided by an embodiment of the utility model;

[0032] Figure 2 This is a disassembled diagram of a CTC battery system provided by an embodiment of the utility model;

[0033] Figure 3 It is a structural schematic diagram of an integrated structure of a liquid cooling plate and a battery frame beam provided by an embodiment of the utility model;

[0034] Figure 4 It is a plan view of the integrated structure of the liquid cooling plate and the battery frame beam provided by one embodiment of the utility model;

[0035] Figure 5 yes Figure 4 Sectional view AA;

[0036] Figure 6 yes Figure 5 The enlarged view of point A in the middle;

[0037] Figure 7 yes Figure 5 The enlarged view of point B in the middle;

[0038] Figure 8 This is a schematic diagram of a structure in which a battery cell provided by an embodiment of the utility model is arranged on a grid structure;

[0039] Fig. 9 It is a structural schematic diagram of a mounting support column provided by an embodiment of the utility model;

[0040] Fig.10 It is a structural schematic diagram of a liquid cooling plate provided by an embodiment of the utility model;

[0041] Fig.11 It is a plan view of a liquid cooling plate provided in one embodiment of the utility model;

[0042] Fig.12 yes Fig.11 Sectional view BB. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0044] Please refer to Figure 1 and Fig.12 The utility model provides an integrated structure 3 of a liquid cooling plate and a battery frame beam, which integrates the liquid cooling plate and the battery frame beam into one, and is applied to a CTC battery system in which the battery is integrated with a vehicle chassis. The integrated structure 3 of the liquid cooling plate and the battery frame beam is used to accommodate battery cells, and is connected to the vehicle chassis through the integrated structure 3 of the liquid cooling plate and the battery frame beam, and the battery cells are arranged on the vehicle chassis. Compared with the prior art, while ensuring the cooling of the battery cells, the side column collision resistance of the chassis and the battery system is enhanced.

[0045] Please refer to Figure 1 and Figure 2 The CTC battery system includes a battery cover 1, a chassis frame 2 of the vehicle, an integrated structure 3 of a liquid cooling plate and a battery frame beam, and a battery bottom plate 4. The upper and lower ends of the chassis frame 2 are connected to the battery cover 1 and the battery bottom plate 4 to form a closed chassis internal space, which is the battery arrangement space. The integrated structure 3 of the liquid cooling plate and the battery frame beam is located inside the closed chassis internal space and is used to accommodate battery cells. The integrated structure 3 of the liquid cooling plate and the battery frame beam is connected to the chassis frame 2 by bolts, so that the battery cells can be reliably arranged in the internal space of the chassis.

[0046] Please refer to Figure 3 The integrated structure 3 of the liquid cooling plate and the battery frame beam includes a liquid cooling plate and a battery frame beam. The battery frame beam includes a plurality of spaced cross beams 32 and a plurality of spaced longitudinal beams. The plurality of cross beams 32 and the plurality of longitudinal beams form a lattice structure. The liquid cooling plate is integrally arranged at the bottom of the lattice structure, so that each lattice in the lattice structure is a structure with an open top and closed sides and bottom for arranging battery cells.

[0047] A plurality of longitudinal beams are vertically connected between the two transverse beams 32 . The plurality of longitudinal beams include two side longitudinal beams 33 and at least one middle longitudinal beam 34 . The middle longitudinal beam 34 is located between the two side longitudinal beams 33 .

[0048] The liquid cooling plate includes a plurality of independently arranged cold plates 31, and the plurality of cold plates 31 are laid along the length direction of the cross beam 32. Both sides of any middle longitudinal beam 34 are respectively connected to a cold plate 31, and two side longitudinal beams 33 are respectively connected to the outer sides of the cold plates 31 on both sides.

[0049] The present utility model does not limit the number of cross beams 32, longitudinal beams and cold plates 31. In this embodiment, taking several cross beams 32 as an example of 3 cross beams 32, four longitudinal beams are arranged between two adjacent cross beams 32, two of which are side longitudinal beams 33 and two are middle longitudinal beams 34. Therefore, four side longitudinal beams 32 and four middle longitudinal beams 34 are arranged between three cross beams 32. One cold plate 31 is arranged between the side longitudinal beam 33 and its adjacent middle longitudinal beam 34, and two cold plates 31 are arranged between two middle longitudinal beams 34.

[0050] The cross beam 32 is an extruded aluminum profile with the same cross section, which is in the shape of a Chinese character 'tian' (田). It includes upper and lower end walls, left and right side walls and a cross rib wall arranged in the middle. The cross rib wall includes a horizontal rib wall and a vertical rib wall. The thickness of the horizontal rib wall is greater than that of the upper and lower end walls, the left and right side walls and the vertical rib wall, aiming to strengthen the strength for facilitating the bolt connection with the chassis frame 2, that is, mainly for matching the chassis frame 2.

[0051] The cross beam 32 is welded to the longitudinal beam to form a frame beam structure. Structural adhesive is applied between the bottom of the cold plate 31 and the cross beam 32, so that four cold plates 31 are spliced into a whole large liquid cooling plate and connected to the frame beam as a whole. That is, the cold plate 31 is welded to the longitudinal beam, the two middle cold plates 31 are welded to each other, and the cold plate 31 is adhesively bonded to the cross beam 32.

[0052] Please refer to Figures 4 to 6 , the side longitudinal beam 33 is an extruded aluminum profile with a T-shaped cross section. The side longitudinal beam 33 includes a first longitudinal beam body 331 and a first convex platform 333. The first convex platform 333 is integrally arranged at the inner lower end of the first longitudinal beam body 331. The first convex platform 333 protrudes a certain distance from the inner side of the first longitudinal beam body 331, so that when the battery cell is placed inside the frame beam, the bottom surface of the battery cell overlaps on the upper surface 3331 of the first convex platform 333. The thickness of the first convex platform 333 is the same as that of the cold plate 31. The lower surface 3333 of the first convex platform 333 is flush with the lower end surface of the first longitudinal beam body 331 and the lower surface of the corresponding side cold plate 31 respectively. The upper surface 3331 of the first convex platform 333 is flush with the upper surface of the side cold plate 31. The side surface 3332 of the first convex platform 333 is in contact with and welded to the side surface of the side cold plate 31 as a whole. The first convex platform 333 is provided with a cavity structure. The shape of the cavity structure is not limited in this embodiment. For example, the cavity structure is rectangular, which is used to weaken the heat transfer between the cold plate 31 and the side longitudinal beam 33.

[0053] The other side of the first longitudinal beam body 331 is the side 332. The lower surface of the side 332 is flush with the lower end surface of the first longitudinal beam body 331. The side 332 can also be provided with a cavity structure, which is used to weaken the heat transfer between the cold plate 31 and the side longitudinal beam on the one hand and reduce the weight on the other hand.

[0054] Please refer to Figure 7 and Figure 8 The middle longitudinal beam 34 is formed by aluminum extrusion, and its cross section is a cavity T-shaped, which includes a second longitudinal beam body 341 and two second bosses 342. The cross section of the second longitudinal beam body 341 is in the shape of a Japanese character, and the two second bosses 342 are respectively and integrally arranged at the lower ends of both sides of the second longitudinal beam body 341. In this embodiment, the two second bosses 342 are symmetrically arranged about the second longitudinal beam body 341, that is, they are respectively protruded from the side walls of the second longitudinal beam body 341 by a certain distance, so that when the battery cell 5 is placed inside the frame beam, the bottom surface of the battery cell 5 overlaps the upper surface of the second boss 342, the thickness of the second boss 342 is consistent with the thickness of the cold plate 31, the lower surfaces of the two second bosses 342 are respectively flush with the lower end surface of the second longitudinal beam body 341 and the lower surface of the cold plate 31 on the corresponding side, the upper surfaces of the two second bosses 342 are respectively flush with the upper surface of the cold plate 31 on the corresponding side, and the side surfaces of the two second bosses 342 are respectively adhered to and welded to the side surfaces of the cold plate 31 on the corresponding side. The second boss 342 is provided with a cavity structure. This embodiment does not limit the shape of the cavity structure. For example, the cavity structure is rectangular, which is used to reduce the heat transfer between the cold plate 31 and the middle longitudinal beam 34 .

[0055] Please refer to Figure 3 and Fig. 9 In order to install the integrated structure 3 of the liquid cooling plate 31 and the battery frame beam on the chassis frame 2, a mounting support column 37 is set on the cross beam 32 at the intersection of the cross beam 32 and the longitudinal beam, and the mounting support column 37 is fastened to the chassis frame 2 by bolts 6.

[0056] The mounting support column 37 is in the shape of a cylindrical shaft and can be made of aluminum alloy. The mounting support column 37 is a cylindrical shaft structure, which includes an upper cylindrical shaft portion 371 and a lower cylindrical shaft portion 372 coaxially arranged up and down, and the outer diameter of the upper cylindrical shaft portion 371 is larger than the outer diameter of the lower cylindrical shaft portion 372. The mounting support column 37 is provided with a through hole, which penetrates the upper cylindrical shaft portion 371 and the lower cylindrical shaft portion 372.

[0057] The cross beam 32 is provided with a mounting hole, which is located above the longitudinal beam. The mounting hole includes an upper hole portion 324, a middle hole portion 322 and a lower hole portion 321 which are coaxially arranged from top to bottom. The aperture of the lower hole portion 321 is larger than that of the upper hole portion 324, and the aperture of the upper hole portion 324 is larger than that of the middle hole portion 322.

[0058] During assembly, the lower cylindrical shaft portion 372 extends into the upper hole portion 324, and the lower cylindrical shaft portion 372 is interference fit with the upper hole portion 324. The outer diameter of the upper cylindrical shaft portion 371 is larger than the hole diameter of the upper hole portion 324, and the lower surface of the upper cylindrical shaft portion 371 fits the upper surface of the beam 32. In this embodiment, the lower surface of the upper cylindrical shaft portion 371 of the mounting support column 37 is glued to the upper surface of the beam 32, or the edge of the upper cylindrical shaft portion 371 of the mounting support column 37 is partially spot welded to the upper surface of the beam 32, so as to realize the connection between the mounting support column 37 and the beam 32.

[0059] The bolt 6 includes a head 61 and a rod 62, the head 61 is located in the lower hole 321, and the rod 62 passes through the middle hole 322 and the through hole of the mounting support column 37 in sequence to be fastened to the chassis frame 2. When the integrated structure 3 of the liquid cooling plate and the battery frame beam is installed on the chassis frame 2, the bolt 6 passes through the mounting hole on the cross beam 32 and the through hole of the mounting support column 37, and the flange surface of the bolt 6 fits with the lower surface of the cross rib 323 in the middle of the cross beam 32 to achieve mounting and fastening.

[0060] In this embodiment, an upper frame beam having the same shape as the battery frame beam is further provided in the chassis frame 2 . The battery frame beam in the integrated structure 3 is fixedly connected to the upper frame beam via a mounting support column 37 . The upper frame beam is located above the integrated structure 3 .

[0061] After the cross beam 32, the middle longitudinal beam 34 and the side longitudinal beam 33 are welded into an integrated frame, a frame structure is formed. The side surface of the cold plate 31 is welded to the middle longitudinal beam 34 and the side longitudinal beam along the length direction of the liquid cooling plate. The two middle cold plates 31 are welded together, and the bottom surface of the cross beam 32 and the upper end surface of the cold plate 31 are connected by structural adhesive, thereby forming an integrated structure 3 of the liquid cooling plate and the battery frame beam with certain strength and rigidity.

[0062] Please refer to Figure 3 , Figures 10 to 12 The liquid cooling plate further includes a total liquid inlet pipe 35 and a total liquid outlet pipe 36. Each cold plate 31 includes a liquid inlet 314 and a liquid outlet 315, all liquid inlets 314 are connected to the total liquid inlet pipe 35, and all liquid outlets 315 are connected to the total liquid outlet pipe 36.

[0063] The cold plate 31 includes a cold plate body 311, a first current collector 312, and a second current collector 313. The cold plate body 311 is formed by aluminum extrusion. The flow channel runs through the cold plate body 311 along the length direction of the cold plate 31. The first current collector 312 and the second current collector 313 are welded to both ends of the cold plate body 311. The flow channel includes an inlet flow channel 3111 and an outlet flow channel 3112 distributed up and down. The inlet flow channel 3111 may be located on the upper side of the outlet flow channel 3112, or the outlet flow channel 3112 may be located on the upper side of the inlet flow channel 3111. The utility model does not limit this.

[0064] The liquid inlet channel 3111 and the liquid outlet channel 3112 both include a plurality of channel holes. The present embodiment does not limit the shapes of the channel holes, and the channel holes may be rectangular, for example.

[0065] The liquid inlet channel 3111 and the liquid outlet channel 3112 are connected in series through the first current collector 312 to achieve a “U”-shaped flow of the coolant on the single cold plate 31 .

[0066] The second current collector 313 is provided with a liquid inlet chamber 3131 and a liquid outlet chamber 3132. The liquid inlet chamber 3131 is connected to the liquid inlet channel 3111. The liquid inlet chamber 3131 is provided with a liquid inlet port 314, which is connected to the main liquid inlet pipe 35 through a liquid inlet pipe. The liquid outlet chamber 3132 is connected to the liquid outlet channel 3112. The liquid outlet chamber 3132 is provided with a liquid outlet port 315, which is connected to the main liquid outlet pipe 36 through a liquid outlet pipe.

[0067] In this embodiment, each cold plate 31 has two sets of flow channels, one inlet and one outlet, to ensure uniform cooling. Since four cold plates 31 are listed in this embodiment, there are four sets of liquid inlet flow channels 3111, which converge to a total liquid inlet pipe 35; there are four sets of liquid outlet flow channels 3112, which converge to a total liquid outlet pipe 36.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. An integrated structure of a liquid cooling plate and a battery frame beam, characterized in that: It includes a liquid cooling plate and a battery frame beam, wherein the battery frame beam includes a plurality of spaced cross beams and a plurality of spaced longitudinal beams, wherein the plurality of cross beams and the plurality of longitudinal beams form a lattice structure, and the liquid cooling plate is integrally arranged at the bottom of the lattice structure; A plurality of longitudinal beams are vertically connected between the two transverse beams, wherein the plurality of longitudinal beams include two side longitudinal beams and at least one middle longitudinal beam, and the middle longitudinal beam is located between the two side longitudinal beams; The liquid cooling plate includes a plurality of independently arranged cold plates, and the plurality of cold plates are laid along the length direction of the cross beam; the two sides of any one of the middle longitudinal beams are respectively connected to a cold plate, and the two side longitudinal beams are respectively connected to the outer sides of the cold plates on the two sides.

2. The integrated structure according to claim 1, characterized in that: The side longitudinal beam includes a longitudinal beam body and a boss, the boss is integrally arranged at the inner lower end of the longitudinal beam body, the lower surface of the boss is flush with the lower end surface of the longitudinal beam body and the lower surface of the cold plate on the corresponding side, the upper surface of the boss is flush with the upper surface of the cold plate on the side, and the side surface of the boss is fixedly connected to the side surface of the cold plate on the side.

3. The integrated structure according to claim 1, characterized in that: The middle longitudinal beam is a T-shaped structure, which includes a longitudinal beam body and two bosses. The two bosses are integrally arranged at the lower ends of both sides of the longitudinal beam body. The lower surfaces of the two bosses are flush with the lower end surface of the longitudinal beam body and the lower surface of the cold plate on the corresponding side. The upper surfaces of the two bosses are flush with the upper surfaces of the cold plate on the corresponding side. The side surfaces of the two bosses are fixedly connected to the side surfaces of the cold plate on the corresponding side.

4. The integrated structure according to claim 1, characterized in that: The liquid cooling plate also includes a total liquid inlet pipe and a total liquid outlet pipe; Each of the cold plates comprises a liquid inlet and a liquid outlet, all the liquid inlets are connected to the main liquid inlet pipe, and all the liquid outlets are connected to the main liquid outlet pipe.

5. The integrated structure according to claim 4, characterized in that: The cold plate includes a cold plate body and a first current collector and a second current collector arranged at both ends of the cold plate body, the cold plate body includes a liquid inlet channel and a liquid outlet channel distributed up and down, the liquid inlet channel and the liquid outlet channel are connected in series through the first current collector; a liquid inlet chamber and a liquid outlet chamber are provided in the second current collector, the liquid inlet chamber is communicated with the liquid inlet channel, and the liquid inlet port is provided on the liquid inlet chamber; the liquid outlet chamber is communicated with the liquid outlet channel, and the liquid outlet port is provided on the liquid outlet chamber.

6. The integrated structure according to claim 1, characterized in that: The cross beam, the longitudinal beam and the cold plate are all extruded.

7. The integrated structure according to claim 5, characterized in that: The liquid inlet flow channel and the liquid outlet flow channel both include a plurality of flow channel holes.

8. The integrated structure according to claim 1, characterized in that: The lower end surface of the cross beam is fixedly connected to the upper end surface of the liquid cooling plate.

9. The integrated structure according to claim 1, characterized in that: A mounting support column is provided at the intersection of the cross beam and the longitudinal beam, and the mounting support column is fastened to the chassis frame by bolts.

10. The integrated structure according to claim 9, characterized in that: The mounting support column is a cylindrical shaft structure, which includes an upper cylindrical shaft portion and a lower cylindrical shaft portion coaxially arranged up and down, and the outer diameter of the upper cylindrical shaft portion is larger than the outer diameter of the lower cylindrical shaft portion; a through hole is provided on the mounting support column, and the through hole passes through the upper cylindrical shaft portion and the lower cylindrical shaft portion; The cross beam is provided with a mounting hole, and the mounting hole is located above the longitudinal beam; the mounting hole comprises an upper hole portion, a middle hole portion and a lower hole portion coaxially arranged from top to bottom, the aperture of the lower hole portion is larger than the aperture of the upper hole portion, and the aperture of the upper hole portion is larger than the aperture of the middle hole portion; The lower cylindrical shaft portion extends into the upper hole portion, and the lower cylindrical shaft portion and the upper hole portion are interference fit; the outer diameter of the upper cylindrical shaft portion is larger than the hole diameter of the upper hole portion, and the lower surface of the upper cylindrical shaft portion is in contact with the upper surface of the crossbeam; The bolt includes a head and a rod, wherein the head is located in the lower hole, and the rod sequentially passes through the middle hole and the through holes of the mounting support column and is fastened to the chassis frame.

11. The integrated structure according to claim 1, characterized in that: The liquid cooling plate and the battery frame beam are integrally extruded.

12. A CTC battery system, characterized in that: It includes a battery cover, a chassis frame of a vehicle, an integrated structure as described in any one of claims 1 to 11, and a battery bottom plate. The upper and lower ends of the chassis frame form a closed chassis internal space for accommodating batteries by connecting the battery cover and the battery bottom plate. The integrated structure of the liquid cooling plate and the battery frame beam is arranged in the chassis internal space.

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