Battery pack box body structure

Abstract

The invention relates to a battery pack box body structure, which belongs to the field of power batteries, and comprises a rolling steel frame body, welding nuts are arranged on both sides of the rolling steel frame body, the welding nuts are screwed with extruded aluminum alloy lifting lugs, a liquid cooling plate is connected in the rolling steel frame body through self-plugging rivets, and a rivet nut penetrating through the liquid cooling plate is arranged on the rolling steel frame body. According to the invention, the riveting nuts are used for connecting the bottom protective plate, the self-plugging rivets are used for connecting the liquid cooling plate, and the rolling steel frame body and the bottom protective plate are fully welded, so that screeding and bolt traces on the bottom protective plate can be avoided, and no interference is generated on a battery replacement station sensor; the supporting aluminum block and the polystyrene foam can enable the bottom protection plate to meet the strength requirement in the conveying process; the welding nuts on the two sides of the rolling steel frame body can enhance the overall rigidity of the box body; the extruded aluminum alloy lifting lug can realize secondary CNC (Computer Numerical Control) processing after tailor welding; and the installation hole site and the installation surface of the lifting lug of the rolling steel box body are not required to be machined before welding, so that the splicing error and the welding deformation of the box body are avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of power batteries, and in particular relates to a battery pack box structure. Background Art

[0002] With the rapid development of new energy vehicles, the demand for battery swapping has also grown simultaneously. At present, the battery pack boxes used in the battery swapping field in the industry are basically aluminum alloy boxes, which are relatively expensive. In comparison, the battery pack boxes manufactured by conventional sheet metal stamping and rolled steel processes have lower dimensional accuracy and rigidity, but have more cost advantages.

[0003] The mounting holes and mounting surfaces of the ear of the battery pack box manufactured by the roll-formed steel process need to be processed before welding. The error of box splicing and welding deformation make the dimensional accuracy of the finished box low. In addition, due to the process factors of roll-formed steel and the demand for lightweight, the roll-formed steel box usually uses thin-walled, simple-section roll-formed steel profiles as frames or beams, resulting in weak overall rigidity of the box. For this reason, super-strong steel is used to enhance the overall rigidity of the box, but the wall thickness is thin, and secondary CNC processing of welding cannot be achieved. The bottom guard plate of the battery pack box is usually thin-walled, but during the battery replacement process, the bottom guard plate needs to withstand the pressure of the conveyor belt. The thin-walled bottom guard plate cannot meet the strength requirements during the transmission process. In addition, the bottom guard plate has ribs and bolt marks, which are prone to interference with the sensors of the battery replacement station, making it difficult to apply in different replacement scenarios. Summary of the invention

[0004] In view of the above problems, the present invention provides a battery pack box structure, including a rolled steel frame, welding nuts are provided on both sides of the rolled steel frame, and the welding nuts are screwed with extruded aluminum alloy lifting ears, and a liquid cooling plate is connected to the rolled steel frame through blind rivets, and the rolled steel frame is provided with rivet nuts penetrating the liquid cooling plate, and a bottom guard plate is fully welded at one end of the rolled steel frame located at the liquid cooling plate, a supporting aluminum block in contact with the bottom guard plate is provided on the liquid cooling plate, the bottom guard plate is connected to the rivet nuts by plug welding, and the space between the bottom guard plate and the liquid cooling plate is a filling cavity, and foam glue is provided in the filling cavity.

[0005] Furthermore, the rolled steel frame includes a rolled steel frame, a crossbeam and a longitudinal beam. The rolled steel frame is connected to the crossbeam, the rolled steel frame is provided with a longitudinal beam connected to the crossbeam, and welding nuts are provided on both sides of the rolled steel frame.

[0006] Furthermore, the crossbeam includes a beam body and an adapter plate, and adapter plates are provided at both ends of the beam body, and the adapter plates are riveted to the rolled steel frame by means of blind rivets.

[0007] Furthermore, the extruded aluminum alloy lifting ear includes a connecting plate, a hanging plate and bolts, the connecting plate is connected to the rolled steel frame by bolts, the bolts are connected to the welding nuts, and a hanging plate is provided at one end of the connecting plate away from the rolled steel plate frame, and a hanging hole is provided on the hanging plate.

[0008] Furthermore, the rivet nut includes a flange portion, a heightened portion and a collapsed portion which are connected in sequence along the vertical direction, the flange portion is provided with a through hole which penetrates the heightened portion and the flange portion in sequence, the bottom guard plate is plug-welded to the flange portion, the collapsed portion is penetrated on the cross beam, and the heightened portion is penetrated on the liquid cooling plate.

[0009] Furthermore, a mounting hole is provided on the crossbeam, a through hole coaxial with the mounting hole is provided on the liquid cooling plate, a part of the collapsed portion is accommodated in the mounting hole, and a part of the heightened portion is accommodated in the through hole.

[0010] Furthermore, the diameter of the flange portion is 15-35 mm.

[0011] Furthermore, the height of the elevated portion is 3-20 mm.

[0012] Furthermore, the liquid cooling plate is provided with a glue injection hole connected to the filling cavity.

[0013] Furthermore, the liquid cooling plate is provided with an exhaust hole connected to the filling cavity.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1) The present invention utilizes rivet nuts to connect the bottom guard plate, utilizes blind rivets to connect the liquid cooling plate, and fully welds the rolled steel frame and the bottom guard plate, which can avoid ribs and bolt marks on the bottom guard plate, and will not interfere with the sensors of the battery swap station, and can adapt to different battery swap scenarios; the supporting aluminum blocks and the filled foam can enable the bottom guard plate to meet the strength requirements during the transmission process; the welding nuts on both sides of the rolled steel frame can enhance the overall rigidity of the box; the extruded aluminum alloy lifting ears can achieve secondary CNC processing after welding; the extruded aluminum alloy lifting ears are screwed to the rolled steel frame, and there is no need to complete the processing of the installation holes and installation surfaces of the rolled steel box lifting ears before welding, thus avoiding the splicing errors and welding deformations of the box and improving the dimensional accuracy of the finished box.

[0016] 2) The present invention utilizes rivet nuts to connect the bottom guard plate and the rolled steel frame of the box body, thereby achieving support and fixation of the bottom guard plate of the box body without concave ribs, and avoiding ribs and bolt marks.

[0017] 3) The flange portion of the rivet nut in the present invention can increase the contact area and reduce stress, and the heightened portion can increase the distance between the collapsed portion and the flange portion, thereby achieving rivet nut when the flange portion is far from the rivet installation surface.

[0018] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A schematic diagram showing the structure of a battery pack box is shown;

[0021] Figure 2 A schematic diagram of the structure of the rivet nut connecting the bottom guard plate and the rolled steel frame is shown;

[0022] Figure 3 A schematic diagram showing the connection between the liquid cooling plate and the rolled steel frame by blind rivets is shown;

[0023] Figure 4 A schematic diagram showing the connection between the extruded aluminum alloy lifting lug and the rolled steel frame is shown;

[0024] Figure 5 The structural schematic diagram of the roll-pressed steel frame is shown;

[0025] Figure 6 A schematic diagram showing the connection between the crossbeam and the rolled steel frame is shown;

[0026] Figure 7 A schematic diagram of the injection hole and the exhaust hole is shown;

[0027] Figure 8 A schematic structural diagram of a rivet nut is shown.

[0028] Figure numerals: 1. rolled steel frame; 11. rolled steel frame; 111. welding nut; 12. cross beam; 121. beam body; 122. adapter plate; 123. mounting hole; 13. longitudinal beam; 2. liquid cooling plate; 21. through hole; 22. glue injection hole; 23. exhaust hole; 3. extruded aluminum alloy lifting ear; 31. connecting plate; 32. lifting plate; 321. lifting hole; 33. bolt; 4. supporting aluminum block; 5. bottom guard plate; 51. filling cavity; 6. rivet nut; 61. flange part; 62. heightened part; 63. collapsed part; 64. through hole; 7. blind rivet. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] Figure 1 Figure 2 shows a schematic diagram of the battery pack box structure. Figure 1 As shown, a battery pack box structure includes a rolled steel frame 1, and both sides of the rolled steel frame 1 are provided with welding nuts 111. Figure 4 The schematic diagram of the connection between the extruded aluminum alloy lifting lug 3 and the rolled steel frame 11 is shown. Figure 4 As shown, the welding nut 111 is screwed with an extruded aluminum alloy lifting lug 3. Figure 2 The schematic diagram of the structure of the rivet nut 6 connecting the bottom guard plate 5 and the rolled steel frame 1 is shown as follows. Figure 2 As shown, the liquid cooling plate 2 is connected to the rolled steel frame 1 through the blind rivets 7, the rolled steel frame 1 is provided with a rivet nut 6 penetrating the liquid cooling plate 2, the rolled steel frame 1 is fully welded with a bottom guard plate 5 at one end of the liquid cooling plate 2, the liquid cooling plate 2 is provided with a supporting aluminum block 4 in contact with the bottom guard plate 5, the bottom guard plate 5 is plug-welded with the rivet nut 6, the space between the bottom guard plate 5 and the liquid cooling plate 2 is a filling cavity 51, and the filling cavity 51 is provided with foam.

[0031] The battery pack box structure utilizes blind rivets 7, rivet nuts 6, supporting aluminum blocks 4, extruded aluminum alloy ears 3, rolled steel frame 1, and welding nuts 111 that screw together the extruded aluminum alloy ears 3 and the rolled steel frame 1, thereby solving the problem that the bottom guard plate 5 of the existing rolled steel box is difficult to use in different battery replacement scenarios; solving the problem that the thin-walled bottom guard plate 5 cannot meet the strength requirements during the transmission process; solving the problem that the wall thickness of the rolled steel box is too thin to achieve secondary CNC processing after welding; solving the problem that the overall rigidity of the rolled steel box is not strong; solving the problem that the box splicing error and welding deformation result in low dimensional accuracy of the finished box.

[0032] Specifically, the foam glue may be selected from but is not limited to polyurethane foam glue.

[0033] Figure 5 FIG. 1 shows a schematic structural diagram of a rolled steel frame 1. Figure 5As shown, in some embodiments, the rolled steel frame 1 includes a rolled steel frame 11, a crossbeam 12 and a longitudinal beam 13, the rolled steel frame 11 is connected with the crossbeam 12, the rolled steel frame 11 is provided with a longitudinal beam 13 connected to the crossbeam 12, and welding nuts 111 are provided on both sides of the rolled steel frame 11; the crossbeam 12 and the longitudinal beam 13 provide installation conditions for installing the liquid cooling plate 2 and support the liquid cooling plate 2.

[0034] Figure 3 The schematic diagram of the connection between the liquid cooling plate 2 and the rolled steel frame 1 is shown. Figure 3 As shown, in some embodiments, the rolled steel frame 11, the cross beam 12 and the longitudinal beam 13 are all connected to the liquid cooling plate 2 by means of blind rivets 7, thereby ensuring the connectivity between the liquid cooling plate 2 and the rolled steel frame 11 and providing reliability.

[0035] In some embodiments, the cross beam 12 is connected to the liquid cooling plate 2 via a blind rivet 7 ; under the connection of the rivet nut 6 , the blind rivet 7 is used to rivet at adjacent positions to ensure the connectivity between the liquid cooling plate 2 and the cross beam 12 .

[0036] Figure 6 FIG. 1 shows a schematic diagram of the connection between the crossbeam 12 and the rolled steel frame 11. Figure 6 As shown, in some embodiments, the cross beam 12 includes a beam body 121 and an adapter plate 122, and adapter plates 122 are provided at both ends of the beam body 121, and the adapter plates 122 are riveted to the rolled steel frame 11 through blind rivets 7; the adapter plate 122 and the rolled steel frame 11 are riveted through the blind rivets 7, which can reduce weld stress and welding deformation.

[0037] In some embodiments, the extruded aluminum alloy lifting ear 3 includes a connecting plate 31, a lifting plate 32 and a bolt 33. The connecting plate 31 is connected to the rolled steel frame 11 through the bolt 33, and the bolt 33 is connected to the welding nut 111. The end of the connecting plate 31 away from the rolled steel plate frame is provided with a lifting plate 32, and the lifting plate 32 is provided with a lifting hole 321; the connecting plate 31 serves to connect the rolled steel frame 11; the bolt 33 serves to connect the rolled steel frame 11 and the connecting plate 31; the lifting plate 32 is a load-bearing component used for lifting; the lifting hole 321 is a connecting hole used for lifting.

[0038] Figure 8 The schematic diagram of the structure of the rivet nut 6 is shown. Figure 8As shown, in some embodiments, the rivet nut 6 includes a flange portion 61, a heightened portion 62 and a collapsed portion 63 which are connected in sequence along the vertical direction, and a through hole 64 is provided in the flange portion 61 which passes through the heightened portion 62 and the flange portion 61 in sequence, the bottom guard plate 5 is connected to the flange portion 61 by plug welding, the collapsed portion 63 is penetrated on the cross beam 12, and the heightened portion 62 is penetrated on the liquid cooling plate 2; the bottom guard plate 5 and the rolled steel frame 1 are connected by the rivet nut 6, that is, the collapsed portion 63 of the rivet nut 6 is penetrated on the cross beam 12, and the heightened portion 62 is penetrated on the liquid cooling plate 2, and the bottom guard plate 5 is then connected to the flange portion 61 of the rivet nut 6 by plug welding, thereby breaking the limitation of the connection, and the bottom guard plate 5 can be directly connected to the rolled steel frame 1 without ribs, thereby avoiding the traces of ribs and bolts 33.

[0039] In some embodiments, the through hole 64 is provided with threads at the location of the collapsed portion 63 , so as to facilitate using a screw on an external rivet gun to pull the collapsed portion 63 of the rivet nut 6 .

[0040] In some embodiments, a mounting hole 123 is provided on the crossbeam 12, and a through hole 21 coaxial with the mounting hole 123 is provided on the liquid cooling plate 2, a portion of the collapsed portion 63 is accommodated in the mounting hole 123, and a portion of the elevated portion 62 is accommodated in the through hole 21; the mounting hole 123 and the through hole 21 provide installation conditions for the rivet nut 6, and also provide connection conditions for the liquid cooling plate 2 and the crossbeam 12.

[0041] Specifically, the beam body 121 is provided with a plurality of evenly distributed mounting holes 123 .

[0042] Specifically, the liquid cooling plate 2 is provided with a plurality of evenly distributed through holes 21 .

[0043] In some embodiments, the diameter of the flange portion 61 is 15-35 mm. The flange portion 61 with a diameter of 15-35 mm can increase the contact area, reduce stress, and avoid deformation.

[0044] In some embodiments, the diameter of the flange portion 61 is 20 mm; the flange portion 61 with a diameter of 20 mm can increase the contact area, reduce stress, and avoid deformation; the flange portion 61 with a diameter of 20 mm and the heightened portion 62 can realize rivet riveting when the flange portion 61 is far away from the rivet installation surface.

[0045] In some embodiments, the height of the heightened portion 62 is 3-20 mm. The heightened portion 62 of 3-20 mm and the flange portion 61 of 15-35 mm in diameter can achieve rivet drawing when the flange portion 61 is far away from the rivet installation surface.

[0046] In some embodiments, the height of the raised portion 62 is 10 mm; the raised portion 62 with a height of 10 mm can increase the distance between the collapsed portion 63 and the flange portion 61; the raised portion 62 with a height of 10 mm and the flange portion 61 with a diameter of 20 mm can realize rivet drawing when the flange portion 61 is far away from the rivet installation surface.

[0047] Figure 7 FIG. 2 shows a schematic diagram of the injection hole 22 and the exhaust hole 23. Figure 7 As shown, in some embodiments, the liquid cooling plate 2 is provided with a glue injection hole 22 connected to the filling cavity 51 ; the glue injection hole 22 is used to inject glue into the filling cavity 51 .

[0048] Specifically, the liquid cooling plate 2 is provided with a glue injection hole 22 communicating with the filling cavity 51 .

[0049] In some embodiments, the liquid cooling plate 2 is provided with an exhaust hole 23 connected to the filling cavity 51; the exhaust hole 23 is used for exhausting the glue during injection.

[0050] Specifically, the liquid cooling plate 2 is provided with a plurality of exhaust holes 23 communicating with the filling cavity 51 .

[0051] The working principle of the battery pack box structure is as follows:

[0052] By using different materials, different connection methods and adding supporting aluminum blocks 4, the adaptability scenarios are increased, and secondary CNC processing can be achieved after welding, which increases the overall rigidity and improves the dimensional accuracy of the finished box. Among them, the two ends of the crossbeam 12 are respectively connected to the rolled steel frame 11 by using blind rivets 7, and then the longitudinal beam 13 is welded to the rolled steel frame 11 and welded to the crossbeam 12 at the same time, and then the roll-pressed steel frame 1 and the liquid cooling plate 2 are connected by blind rivets 7, and then the crossbeam 12 and the bottom guard plate 5 are connected by rivet nuts 6, and then the bottom guard plate 5 and the rolled steel frame 11 are fully welded, and then the foam glue is injected into the filling cavity 51 through the glue injection hole 22. During the glue application process, the exhaust hole 23 exhausts the gas.

[0053] The bottom guard plate 5 and the liquid cooling plate 2 are connected by rivet nuts 6, and the rolled steel frame 1 and the bottom guard plate 5 are fully welded, which can avoid the ribs and bolts 33 on the bottom guard plate 5, and will not interfere with the sensors of the battery swap station, and can adapt to different battery swap scenarios; the supporting aluminum block 4 and the filled foam rubber can make the bottom guard plate 5 meet the strength requirements during the transmission process; the welding nuts 111 on both sides of the rolled steel frame 1 can enhance the overall rigidity of the box; the extruded aluminum alloy lifting ear 3 can achieve secondary CNC processing after welding; the extruded aluminum alloy lifting ear 3 is screwed to the rolled steel frame 1, and there is no need to complete the processing of the installation holes and installation surfaces of the rolled steel box lifting ear before welding, which avoids the splicing error and welding deformation of the box and improves the dimensional accuracy of the finished box.

[0054] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A battery pack box structure, characterized in that: The invention comprises a rolled steel frame (1), both sides of which are provided with welding nuts (111), the welding nuts (111) being screwed with extruded aluminum alloy hanging ears (3), the rolled steel frame (1) being connected with a liquid cooling plate (2) via a blind rivet (7), the rolled steel frame (1) being provided with a rivet nut (6) penetrating the liquid cooling plate (2), a bottom guard plate (5) being fully welded at one end of the rolled steel frame (1) located on the liquid cooling plate (2), a supporting aluminum block (4) being provided on the liquid cooling plate (2) and being in contact with the bottom guard plate (5), the bottom guard plate (5) being plug-welded to the rivet nut (6), the space between the bottom guard plate (5) and the liquid cooling plate (2) being a filling cavity (51), and a foaming glue being provided in the filling cavity (51).

2. The battery pack box structure according to claim 1, characterized in that: The rolled steel frame (1) comprises a rolled steel frame (11), a crossbeam (12) and a longitudinal beam (13); the rolled steel frame (11) is connected with the crossbeam (12); the rolled steel frame (11) is provided with a longitudinal beam (13) connected with the crossbeam (12); and welding nuts (111) are provided on both sides of the rolled steel frame (11).

3. The battery pack box structure according to claim 2, characterized in that: The crossbeam (12) comprises a beam body (121) and an adapter plate (122), and the adapter plates (122) are provided at both ends of the beam body (121), and the adapter plates (122) are riveted to the rolled steel frame (11) by means of blind rivets (7).

4. The battery pack box structure according to claim 1, characterized in that: The extruded aluminum alloy lifting lug (3) comprises a connecting plate (31), a hanging plate (32) and a bolt (33); the connecting plate (31) is connected to the rolled steel frame (11) via the bolt (33); the bolt (33) is connected to the welding nut (111); a hanging plate (32) is provided at one end of the connecting plate (31) away from the rolled steel frame; and a hanging hole (321) is provided on the hanging plate (32).

5. The battery pack box structure according to claim 1, characterized in that: The rivet nut (6) comprises a flange portion (61), a heightened portion (62) and a collapsed portion (63) which are connected in sequence along the vertical direction; a through hole (64) is provided in the flange portion (61) which passes through the heightened portion (62) and the flange portion (61) in sequence; the bottom guard plate (5) is connected to the flange portion (61) by plug welding; the collapsed portion (63) is passed through the cross beam (12) and the heightened portion (62) is passed through the liquid cooling plate (2).

6. The battery pack box structure according to claim 5, characterized in that: The crossbeam (12) is provided with a mounting hole (123), the liquid cooling plate (2) is provided with a through hole (21) coaxial with the mounting hole (123), a portion of the collapsed portion (63) is accommodated in the mounting hole (123), and a portion of the heightened portion (62) is accommodated in the through hole (21).

7. The battery pack box structure according to claim 5, characterized in that: The diameter of the flange part (61) is 15-35 mm.

8. The battery pack box structure according to claim 5, characterized in that: The height of the elevated portion (62) is 3-20 mm.

9. The battery pack box structure according to any one of claims 1 to 8, characterized in that: The liquid cooling plate (2) is provided with a glue injection hole (22) which is in communication with the filling cavity (51).

10. The battery pack box structure according to any one of claims 1 to 8, characterized in that: The liquid cooling plate (2) is provided with an exhaust hole (23) which is in communication with the filling cavity (51).

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