Stamping lower box body structure

Abstract

The utility model discloses a stamping lower box body structure, which relates to the technical field of battery packs and comprises a box body frame, a heat insulation pad, a water cooling plate assembly and a cross beam assembly, the box body structure is formed by sequentially stacking a box body frame, a heat insulation pad, a water cooling plate assembly and a cross beam assembly from bottom to top; the box body frame comprises a box body main body, a longitudinal beam, a rear end cross beam, a hoisting seat and a mounting seat; and the box body main body is integrally formed through high-pressure stamping. According to the utility model, the peripheral sealed mounting frames and the middle supporting cross beam of the box body are integrally formed through high-pressure stamping, the middle part of the box body is downwards sunken through stamping to form the bottom supporting plate, meanwhile, the four side edge parts of the box body are upwards raised through stamping to form the sealed mounting frames, and no welding seam exists among the peripheral frames; the overall strength is improved by 30% compared with that of welded parts; compared with traditional welding forming, punch forming is higher in efficiency and better in consistency.

Description

Technical Field

[0001] The utility model relates to the technical field of battery packs, in particular to a stamped lower box structure. Background Art

[0002] After years of development, new energy vehicle technology is constantly developing and improving. People have higher and higher requirements for battery life and safety. As an important component of the battery pack, the box plays a very important role in it; the better the strength and safety of the box, the better the safety of the entire battery pack and even the entire vehicle.

[0003] For example, the patent publication number is: CN215644808U "A power battery system structure", which includes a box body and a box cover. The box body is convex, and the bottom of the box body is divided into seven spaces by a number of brackets. The first space on the left is used to fix the high-voltage box, and the remaining space is used to place the module. Two modules are placed side by side in each space. A liquid cooling system is arranged at the bottom of the module. The liquid cooling system includes a liquid cooling plate and pipelines. The liquid cooling plate is made by stamping process, and the pipeline is corrugated pipeline with quick plug connection.

[0004] However, in the existing technology, the box frame is assembled by welding on all sides. The strength of the weld is about 30% lower than the strength of the material body, and the safety strength is relatively weak. In addition, the welding process is time-consuming, which seriously affects the production capacity of parts. At the same time, the bottom of the box dissipates heat quickly and has poor thermal insulation performance, which is also an important reason for the low mileage of new energy vehicles in winter. Utility Model Content

[0005] The purpose of the utility model is to provide a stamped lower box structure to solve the problems raised by the above background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a stamped lower box structure, including a box frame, an insulation pad, a water-cooled plate assembly and a crossbeam assembly, and the box structure is composed of a box frame, an insulation pad, a water-cooled plate assembly and a crossbeam assembly stacked in sequence from bottom to top, the box frame is on the first layer at the bottom, the insulation pad is on the second layer, the water-cooled plate assembly is on the third layer, and the crossbeam assembly is on the fourth layer at the top, the box body is formed by integral stamping, the box frame includes a box body, a longitudinal beam, a rear end crossbeam, a hanging seat and a mounting seat, and the longitudinal beam, the rear end crossbeam, the hanging seat and the mounting seat are formed by a bending stamping process; the longitudinal beam and the rear end crossbeam are welded and assembled inside the box body, and the hanging seat is welded outside the box body, the box body is integrally formed by high-pressure stamping, wherein the middle part of the box body The bottom support plate is formed by being depressed downward by stamping, and the four side parts of the box body are convex upward by stamping to form a sealed installation frame. The sealed installation frame serves as the surrounding installation frame of the box frame. The weld is eliminated through one-piece molding, which improves the consistency of the box structure. A rear end crossbeam is installed at one end of the box body, and the rear end crossbeam is mainly used to ensure the expansion support of the battery cells inside the box body in the later stage; the lifting seat ensures the lifting and transportation function of the entire battery pack in the later stage. The upper surface of the bottom support plate is provided with three longitudinal beams at equal intervals in the vertical direction. The top of the longitudinal beam is fixedly connected with a mounting seat, and the mounting seat is welded and assembled on the longitudinal beam of the box body and the box frame. The upper end of the box body main structure ensures the sealed connection assembly and support, and the lower end of the surrounding sealed installation frame ensures the connection and support with the water cooling plate assembly and the thermal insulation pad;

[0007] The box frame is used to fix and support the battery pack, the insulation pad is used to isolate the heat between the box frame and the water-cooled plate assembly, the water-cooled plate assembly controls the temperature through water cooling, and the thermal insulation performance of the battery pack is improved through the combined effect of the insulation pad and the water-cooled plate assembly. The crossbeam assembly is used to ensure the overall structural strength of the box and support the subsequent expansion of the battery cells.

[0008] Preferably, a hanging seat is fixedly connected to the outer side wall of the sealing installation frame, and a mounting hole 1 is opened on the surface of the hanging seat. The hanging seat is used for hanging and transporting the battery pack.

[0009] Preferably, the water cooling plate assembly includes a temperature equalizing plate and a flow channel plate, both ends of the temperature equalizing plate are connected with water inlets and outlets, a flow channel is opened on the bottom surface of the flow channel plate, the temperature equalizing plate is a flat plate structure, both ends of the temperature equalizing plate are connected with installation interfaces, the position of the water cooling plate assembly is fixed by tooling, and installed on the thermal insulation pad, and the water cooling plate assembly and the thermal insulation pad are fixed by glue.

[0010] Preferably, the crossbeam assembly includes a front end crossbeam 1, a front end crossbeam 2 and a middle crossbeam, both ends of which are connected with welding bolts, the rear end crossbeam is composed of an expansion support surface and reinforcing ribs, and the front end crossbeam 1, the front end crossbeam 2 and the middle crossbeam are also designed with an expansion support surface, and the expansion support surface is used to support the expansion of the battery cells in the later battery pack.

[0011] Preferably, a second mounting hole is opened on the surface of the mounting seat, the welding bolt is threadedly connected to the second mounting hole, the beam assembly is connected to the mounting seat by welding bolts, the beams in the beam assembly are assembled with welding nuts, positioned by tooling and the mounting seat on the box frame, and then fixedly connected by bolts.

[0012] Preferably, the thermal insulation pad is formed by foaming and has adhesive on both sides. The thermal insulation pad is assembled with the water cooling plate assembly and the bottom support plate by glue. The box frame is placed on the installation table, the adhesive sticker on the back of the thermal insulation pad is torn off, the thermal insulation pad is assembled inside the box body by tooling, and fixed by glue.

[0013] Preferably, a sealing installation hole is provided on the top surface of the sealing installation frame, an inlet and outlet installation hole is provided on the side surface of the sealing installation frame, and the water inlet and outlet extend from the inlet and outlet installation holes to the outside to connect with the water tank.

[0014] Preferably, the temperature equalizing plate and the flow channel plate are assembled and formed by brazing, and the mounting interface and the water inlet and outlet are formed by cold metal transition welding.

[0015] Preferably, the temperature equalizing plate and the flow channel plate are both made of thin aluminum plates, and the water-cooling plate in the middle is also composed of thin aluminum plates, which have good heat dissipation effect, light weight, can effectively reduce heat transfer from the bottom, and have good thermal insulation effect.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] 1. In the utility model, the surrounding sealed installation frame and the middle supporting beam are integrally formed by high-pressure stamping. There is no weld between the surrounding frames, and the overall strength is increased by 30% compared with welded parts. Stamping molding is more efficient and more consistent than traditional welding molding.

[0018] 2. In the present invention, the water-cooling plate assembly is assembled with thin plates, and the overall weight is relatively light; an insulation pad is integrated between the water-cooling plate assembly and the bottom guard plate, which can effectively prevent heat from being transmitted from the bottom of the box, thereby improving the thermal insulation performance of the battery pack.

[0019] 3. In the utility model, by modularizing the components of the lower box body, installation is simple and convenient; the assembly process is highly automated and the molding efficiency is high.

[0020] 4. In the utility model, the crossbeam assembly structure is assembled above the water-cooling plate; the crossbeam assembly is connected to the box mounting seat by bolts to ensure the overall structural strength of the box and the support for the subsequent expansion of the battery cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is an exploded effect diagram of a box assembly structure of a stamped lower box structure of the utility model;

[0022] Figure 2 It is a three-dimensional structural schematic diagram of a stamped lower box structure of the utility model;

[0023] Figure 3 It is a structural schematic diagram of a box frame in a stamped lower box structure of the utility model;

[0024] Figure 4 For this utility model Figure 3 A magnified rendering of the local structure at the middle mounting seat;

[0025] Figure 5 For this utility model Figure 3 A magnified rendering of the local structure at the middle lifting seat;

[0026] Figure 6 This is a schematic diagram of the structure of a temperature balancing plate in a stamping lower box structure of the utility model;

[0027] Figure 7 This is a schematic diagram of the bottom structure of a temperature balancing plate in a stamping lower box structure of the utility model;

[0028] Figure 8 It is a structural schematic diagram of a heat insulation pad in a stamped lower box structure of the utility model;

[0029] Fig. 9 This is a schematic diagram of the crossbeam assembly structure of a stamped lower box structure of the utility model.

[0030] In the figure: 1. Box frame; 11. Box body; 111. Sealing installation frame; 112. Sealing installation hole; 113. Inlet and outlet installation holes; 114. Bottom support plate; 12. Longitudinal beam; 13. Rear end beam; 14. Lifting seat; 140. Mounting hole one; 15. Mounting seat; 150. Mounting hole two; 2. Insulation pad; 3. Water cooling plate assembly; 31. Temperature equalizing plate; 310. Mounting interface; 32. Flow channel plate; 320. Flow channel; 33. Water inlet and outlet; 4. Beam assembly; 41. Front end beam one; 42. Front end beam two; 43. Middle beam; 44. Welding bolts. DETAILED DESCRIPTION

[0031] 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 implementation regulations described are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of 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. Embodiment 1

[0032] according to Figure 1-9 As shown: it includes a box frame 1, an insulation pad 2, a water-cooled plate assembly 3 and a crossbeam assembly 4, and the box structure is composed of the box frame 1, the insulation pad 2, the water-cooled plate assembly 3 and the crossbeam assembly 4 stacked in sequence from bottom to top, the box frame 1 includes a box body 11, a longitudinal beam 12, a rear end crossbeam 13, a lifting seat 14 and a mounting seat 15, the box body 11 is integrally formed by high-pressure stamping, wherein the middle part of the box body 11 is depressed downward by stamping to form a bottom support plate 114, and at the same time, the four side parts of the box body 11 are convex upward by stamping to form a sealed mounting frame 111, and the sealed mounting frame 111 serves as a surrounding mounting frame of the box frame 1, and the weld is eliminated by integral molding, thereby improving the consistency of the box structure, a rear end crossbeam 13 is installed at one end of the box body 11, and three longitudinal beams 12 are arranged at equal intervals on the upper surface of the bottom support plate 114 in the vertical direction, and the top of the longitudinal beam 12 is fixedly connected with a mounting seat 15;

[0033] The box frame 1 is used to fix and support the battery pack, the insulation pad 2 is used to isolate the heat between the box frame 1 and the water-cooled plate assembly 3, the water-cooled plate assembly 3 controls the temperature through water cooling, and the thermal insulation performance of the battery pack is improved through the combined action of the insulation pad 2 and the water-cooled plate assembly 3. The crossbeam assembly 4 is used to ensure the overall structural strength of the box and support the subsequent expansion of the battery cells.

[0034] In this embodiment, the box frame 1 is on the first layer at the bottom, the insulation pad 2 is on the second layer, the water-cooled plate assembly 3 is on the third layer, and the crossbeam assembly 4 is on the fourth layer at the top. The box body 11 is formed by integral stamping, and the longitudinal beam 12, the rear end crossbeam 13, the lifting seat 14 and the mounting seat 15 are formed by a bending and stamping process; the longitudinal beam 12 and the rear end crossbeam 13 are welded and assembled inside the box body 11, and the lifting seat 14 is welded outside the box body 11; the mounting seat 15 is welded and assembled on the longitudinal beam 12 and the box frame 1 of the box body, and the upper end of the box body 11 structure ensures sealed connection assembly and support, and the lower end of the sealed mounting frame 111 around it ensures connection and support with the water-cooled plate assembly 3 and the insulation pad 2; the rear end crossbeam 13 mainly ensures the expansion support of the battery cells inside the box in the later stage; the lifting seat 14 ensures the lifting and transportation function of the entire battery pack in the later stage. Embodiment 2

[0035] according to Figure 3 , Figure 4 , Figure 5 and Fig. 9 As shown, the outer wall of the sealed mounting frame 111 is fixedly connected with a hoisting seat 14, and a mounting hole 140 is provided on the surface of the hoisting seat 14. The hoisting seat 14 is used for hoisting and transportation of the battery pack. The water-cooling plate assembly 3 includes a temperature-averaging plate 31 and a flow channel plate 32. Both ends of the temperature-averaging plate 31 are connected with water inlets and outlets 33. The bottom surface of the flow channel plate 32 is provided with a flow channel 320. The temperature-averaging plate 31 is a flat plate structure, and both ends of the temperature-averaging plate 31 are connected with mounting interfaces 310. The crossbeam assembly 4 includes a front crossbeam 1 41, a front crossbeam 2 42 and a middle crossbeam 43. The two ends of the front crossbeam 1 41, the front crossbeam 2 42 and the middle crossbeam 43 are connected with welding bolts 44. The surface of the mounting seat 15 is provided with a mounting hole 2 150, and the welding bolt 44 is threadedly connected to the mounting hole 2 150. The crossbeam assembly 4 is connected to the mounting seat 15 through the welding bolt 44. The thermal insulation pad 2 is formed by foaming and has adhesive on both sides. The thermal insulation pad 2 is assembled with the water cooling plate assembly 3 and the bottom support plate 114 by glue.

[0036] In this embodiment, the mounting seat 15 is welded and assembled on the longitudinal beam 12 of the box body and the box frame 1. The upper end of the box body 11 structure ensures sealed connection assembly and support. The lower end of the sealed mounting frame 111 is ensured to be connected and supported with the water-cooled plate assembly 3 and the thermal insulation pad 2. The box frame 1 is placed on the installation table, the adhesive sticker on the back of the thermal insulation pad 2 is torn off, and the thermal insulation pad 2 is assembled inside the box body 11 through the tooling and fixed by glue; then the water-cooled plate assembly 3 is fixed in position through the tooling and installed on the thermal insulation pad 2, and the water-cooled plate assembly 3 and the thermal insulation pad 2 are fixed by glue; then the crossbeam assembly 4 is assembled, and the crossbeams in the crossbeam assembly 4 are assembled with welding nuts, which are positioned through the tooling and the mounting seat 15 on the box frame 1, and then fixedly connected by bolts. Embodiment 3

[0037] according to Figure 6 , Figure 7 , Figure 8 and Fig. 9As shown, the water-cooled plate assembly 3 includes a temperature-averaging plate 31 and a flow channel plate 32. Both ends of the temperature-averaging plate 31 are connected with water inlets and outlets 33. The bottom surface of the flow channel plate 32 is provided with a flow channel 320. The temperature-averaging plate 31 is a flat plate structure. Both ends of the temperature-averaging plate 31 are connected with mounting interfaces 310. The crossbeam assembly 4 includes a front crossbeam 1 41, a front crossbeam 2 42 and a middle crossbeam 43. Both ends of the front crossbeam 1 41, the front crossbeam 2 42 and the middle crossbeam 43 are connected with welding bolts 44. The surface of the mounting seat 15 is provided with a mounting hole 2 150. The welding bolt 44 is threadedly connected to the mounting hole 2 150. The crossbeam assembly 4 is connected to the mounting seat 15 through the welding bolt 44. The thermal insulation pad 2 is formed by foaming and has adhesive on both sides. The thermal insulation pad 2 is assembled with the water-cooled plate assembly 3 and the bottom support plate 114 by glue. The top surface of the sealing installation frame 111 is provided with a sealing installation hole 112, and the side surface of the sealing installation frame 111 is provided with an inlet and outlet installation hole 113. The water inlet and outlet 33 extend from the inlet and outlet installation hole 113 to the outside and connect with the water tank. The temperature averaging plate 31 and the flow channel plate 32 are assembled by brazing, and the installation interface 310 and the water inlet and outlet 33 are formed by cold metal transition welding. The temperature averaging plate 31 and the flow channel plate 32 are both made of thin aluminum plates.

[0038] In this embodiment, the sealing installation frame 111 is composed of a sealing installation surface, side reinforcement ribs on both sides and bottom reinforcement ribs at the bottom end, and the whole is integrally formed with the bottom support plate 114. The longitudinal beam 12 is also composed of an upper installation support surface and bottom reinforcement ribs. The lifting seat 14 is also composed of an upper surface installation surface and reinforcement ribs on both sides. The mounting seat 15 is composed of two triangular parts. The mounting surface of the triangular part is used to set the second mounting hole 150 so as to position and install it with the beam assembly 4. The reinforcement ribs of the triangular part are used to connect and support the installation between the beam and the longitudinal beam; the rear end beam 13 is composed of an expansion support surface and reinforcement ribs, and the front end beam 1 41, the front end beam 2 42 and the middle beam 43 are also designed with an expansion support surface. The expansion support surface is used to support the expansion of the battery cells in the later battery pack. The middle water cooling plate assembly 3 is composed of a thin aluminum plate, which has good heat dissipation effect and light weight. It can effectively reduce the heat transfer from the bottom and has good thermal insulation effect.

[0039] The use method and working principle of the device: When assembling the box, first, the longitudinal beam 12 and the rear end cross beam 13 are welded and assembled inside the box body 11, and the hanging seat 14 is welded outside the box body 11; the mounting seat 15 is welded and assembled on the longitudinal beam 12 of the box body and the box frame 1, and the upper end of the box body 11 structure is ensured to be sealed, connected, assembled and supported;

[0040] Then, place the box frame 1 on the installation table, tear off the adhesive sticker on the back of the heat insulation pad 2, assemble the heat insulation pad 2 inside the box body 11 through the tooling, and fix it with glue;

[0041] Then, the water-cooling plate assembly 3 is fixed in position by a tooling and installed on the thermal insulation pad 2. The water-cooling plate assembly 3 and the thermal insulation pad 2 are fixed by gluing;

[0042] Finally, assemble the crossbeam assembly 4, the crossbeams in the crossbeam assembly 4 are assembled with welding nuts, positioned by the tooling and the mounting seat 15 on the box frame 1, and finally fixedly connected by bolts.

[0043] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A stamped lower box structure, comprising a box frame (1), a heat insulation pad (2), a water cooling plate assembly (3) and a cross beam assembly (4), wherein the box structure is composed of the box frame (1), the heat insulation pad (2), the water cooling plate assembly (3) and the cross beam assembly (4) stacked in sequence from bottom to top, characterized in that: The box frame (1) comprises a box body (11), a longitudinal beam (12), a rear end cross beam (13), a hanging seat (14) and a mounting seat (15); the box body (11) is integrally formed by high-pressure stamping, wherein the middle portion of the box body (11) is recessed downward by stamping to form a bottom support plate (114), and the four side portions of the box body (11) are convex upward by stamping to form a sealed mounting frame (111); the sealed mounting frame (111) serves as a surrounding mounting frame of the box frame (1), and eliminates welds by integral molding; a rear end cross beam (13) is installed at one end of the box body (11); three longitudinal beams (12) are arranged at equal intervals on the upper surface of the bottom support plate (114) in the vertical direction; and the top of the longitudinal beam (12) is fixedly connected to the mounting seat (15); The box frame (1) is used to fix and support the battery pack, the heat insulation pad (2) is used to isolate the heat between the box frame (1) and the water cooling plate assembly (3), the water cooling plate assembly (3) controls the temperature by water cooling, and heat preservation is performed by the combined action of the heat insulation pad (2) and the water cooling plate assembly (3), and the crossbeam assembly (4) is used to ensure the overall structural strength of the box and to support the expansion of the battery cells in the later stage.

2. The stamped lower box structure according to claim 1, characterized in that: The outer side wall of the sealed installation frame (111) is fixedly connected to a hanging seat (14), a surface of the hanging seat (14) is provided with a mounting hole 1 (140), and the hanging seat (14) is used for hanging and transporting a battery pack.

3. The stamped lower box structure according to claim 1, characterized in that: The water cooling plate assembly (3) comprises a temperature averaging plate (31) and a flow channel plate (32); both ends of the temperature averaging plate (31) are connected to a water inlet and outlet (33); a flow channel (320) is provided on the bottom surface of the flow channel plate (32); the temperature averaging plate (31) is a flat plate structure; both ends of the temperature averaging plate (31) are connected to mounting interfaces (310).

4. The stamped lower box structure according to claim 1, characterized in that: The crossbeam assembly (4) comprises a front end crossbeam 1 (41), a front end crossbeam 2 (42) and a middle crossbeam (43), and both ends of the front end crossbeam 1 (41), the front end crossbeam 2 (42) and the middle crossbeam (43) are connected with welding bolts (44).

5. The stamped lower box structure according to claim 4, characterized in that: A second mounting hole (150) is provided on the surface of the mounting seat (15), the welding bolt (44) is threadedly connected to the second mounting hole (150), and the crossbeam assembly (4) is connected to the mounting seat (15) via the welding bolt (44).

6. The stamped lower box structure according to claim 1, characterized in that: The thermal insulation pad (2) is formed by foaming and has adhesive on both sides. The thermal insulation pad (2) is assembled with the water cooling plate assembly (3) and the bottom support plate (114) by glue.

7. The stamped lower box structure according to claim 3, characterized in that: The top surface of the sealing installation frame (111) is provided with a sealing installation hole (112), the side surface of the sealing installation frame (111) is provided with an inlet and outlet installation hole (113), and the water inlet and outlet (33) extend from the inlet and outlet installation holes (113) to the outside to connect with the water tank.

8. The stamped lower box structure according to claim 3, characterized in that: The temperature-averaging plate (31) and the flow channel plate (32) are assembled and formed by brazing, and the mounting interface (310) and the water inlet and outlet (33) are formed by cold metal transition welding.

9. The stamped lower box structure according to claim 3, characterized in that: The temperature-averaging plate (31) and the flow channel plate (32) are both made of thin aluminum plates.

Images