Battery box beam, battery box body and battery module

Abstract

The utility model provides a battery box girder, a battery box body and a battery module, relates to the technical field of batteries, and aims to solve the technical problem that the connection strength of a rolled battery box girder at a joint is not enough, so that the battery box girder can be separated. The battery box girder comprises a body wall, the first rolling wall is connected to one end of the body wall, the first rolling wall comprises a first pressure bearing section, and the first pressure bearing section and the body wall are oppositely arranged; the second rolling wall is connected to the other end of the body wall, the second rolling wall comprises a second pressure-bearing section, and the second pressure-bearing section and the first pressure-bearing section are oppositely arranged, extend oppositely and are partially overlapped. The requirements of light weight and strength of the battery module can be met.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery box beam, a battery box body and a battery module. Background Art

[0002] In the related art, it is proposed to use a rolling process to bend a plate to form a closed structure, and then use horizontal welding to connect the two ends of a plate to form an anti-expansion beam. Although this method effectively reduces the welding position and improves the ability to withstand expansion and extrusion force, the welding surface (weld) is consistent with the extrusion force direction when the battery cell expands, which causes the weld between the two end walls of the anti-expansion beam to crack easily and the welding surface to separate. Therefore, the anti-expansion and extrusion performance of the anti-expansion beam needs to be improved. Utility Model Content

[0003] The embodiments of the utility model provide a battery box beam, a battery box body and a battery module, which are used to improve the technical problem of the anti-expansion and extrusion performance of the anti-expansion beam.

[0004] In a first aspect, an embodiment of the utility model provides a battery box beam, comprising:

[0005] body wall;

[0006] A first roller pressure wall connected to one end of the main body wall, the first roller pressure wall comprising a first pressure-bearing section, the first pressure-bearing section being arranged opposite to the main body wall;

[0007] The second roller pressure wall is connected to the other end of the main body wall. The second roller pressure wall includes a second pressure-bearing section. The second pressure-bearing section is arranged opposite to the main body wall and extends toward and partially overlaps with the first pressure-bearing section.

[0008] In some embodiments of the present application, the first pressure-bearing section includes a first extension section and a second extension section which are interconnected and extend in the same direction, the second extension section is closer to the main body wall than the first extension section, the first extension section and the second extension section jointly define a lap joint, the end of the second pressure-bearing section close to the first pressure-bearing section is arranged on the lap joint and overlaps with the second extension section.

[0009] In some embodiments of the present application, the first extension section has a first surface facing away from the main body wall, the second pressure-bearing section has a second surface facing away from the main body wall, and the first surface is coplanar with the second surface.

[0010] In some embodiments of the present application, the first roller pressure wall also includes a first connecting section, which is connected between the first pressure-bearing section and the main body wall; the second roller pressure wall also includes a second connecting section, which is connected between the second pressure-bearing section and the main body wall and is arranged opposite to the first connecting section; the main body wall, the first connecting section, the first pressure-bearing section, the second pressure-bearing section and the second connecting end enclose a beam inner cavity.

[0011] In some embodiments of the present application, the first roller pressure wall also includes a buffer section, which is connected to the end of the first pressure-bearing section close to the second pressure-bearing section and extends toward the main body wall. The buffer section is configured to support the first pressure-bearing section and the second pressure-bearing section when the first pressure-bearing section and the second pressure-bearing section are under pressure, and to slide along the main body wall to buffer the extrusion force.

[0012] In some embodiments of the present application, the buffer section includes a supporting section and an abutting section, the supporting section is connected between the first pressure-bearing section and the abutting section, and the abutting section is parallel to and abuts against the main body wall.

[0013] In some embodiments of the present application, the abutting section extends in opposite directions to the first pressure-bearing section.

[0014] In some embodiments of the present application, the battery box beam is a rolled steel beam with a wall thickness between 1 mm and 2 mm.

[0015] In a second aspect, an embodiment of the present application provides a battery box, the battery box including a first direction, the battery box including:

[0016] A rolling assembly encloses a fixed space for fixing the battery cell module, and the rolling assembly includes two anti-expansion beams arranged opposite to each other, the two anti-expansion beams are arranged relatively spaced apart along the first direction, and the two anti-expansion beams are both the battery box beams as described in the first aspect.

[0017] In some embodiments of the present application, the battery box further includes a second direction, the first direction and the second direction intersect, and the rolling assembly further includes:

[0018] Two roller-pressed side beams are arranged opposite to each other along the second direction, and two ends of each anti-expansion beam are respectively connected to the two roller-pressed side beams to define the fixed space.

[0019] In some embodiments of the present application, the two rolled side beams are both the battery box beams, the two rolled side beams have the same thickness, and the thickness of the rolled side beam is less than the thickness of the anti-expansion beam.

[0020] In some embodiments of the present application, the rolling assembly further includes:

[0021] At least one first cross beam and at least one second cross beam, the first cross beam and the second cross beam are both located in the fixed space, the first cross beam is cross-connected with the second cross beam, the two ends of the first cross beam are respectively connected to the two roller-pressed edge beams, and the two ends of the second cross beam are respectively connected to the two anti-expansion beams.

[0022] In some embodiments of the present application, the battery box also includes a first frame, both sides of which are respectively connected to one side of the two rolled side beams, the first frame is spaced apart from a battery box beam adjacent to it to define an anti-extrusion area, a plurality of anti-extrusion beams are spaced apart in the anti-extrusion area, and both ends of each anti-extrusion beam are respectively connected to the first frame and the anti-expansion beam adjacent to the first frame.

[0023] In some embodiments of the present application, the battery box also includes a second frame, which is arranged opposite to the first frame, and the two ends of the second frame are respectively connected to the two rolled edge beams, and the second frame is spaced apart from an anti-expansion beam adjacent to it, and the spacing distance is greater than 5 mm.

[0024] In a third aspect, an embodiment of the present application provides a battery module, comprising:

[0025] Base plate;

[0026] A bottom guard plate, arranged on the bottom plate;

[0027] A liquid cooling plate, arranged on the bottom guard plate;

[0028] The battery box as described in the second aspect is arranged on the liquid cooling plate;

[0029] A plurality of battery cell modules are arranged in a fixed space of the battery box;

[0030] An integrated busbar, provided on the plurality of battery core modules;

[0031] An insulating layer is provided on a side of the integrated busbar away from the battery module;

[0032] A box cover is arranged on the battery module, and the insulating layer is located between the box cover and the integrated busbar.

[0033] Beneficial effects of the embodiments of the utility model:

[0034] In the embodiment of the utility model, the first pressure-bearing section and the second pressure-bearing section extend toward each other and partially overlap, so that the welding surface is located in the overlapping part, and the welding surface is perpendicular to the direction of the extrusion force when extending toward each other, effectively avoiding the risk of the welding surface being separated due to the extrusion force. In addition, the welding surface is vertical, so that the first pressure-bearing section and the second pressure-bearing section overlap in the direction of resisting the extrusion force, thereby enhancing the ability to resist extrusion. In detail, first, the structure of the battery box beam is enclosed by connecting the main body wall, the first roller-pressure wall and the second roller-pressure wall to each other, and then the first pressure-bearing section and the second pressure-bearing section are arranged opposite to the main body wall, that is, the first pressure-bearing section and the second pressure-bearing section are located on the same side of the main body wall, and then the first pressure-bearing section and the second pressure-bearing section are extended toward each other and partially overlapped, thereby improving the ability of the battery box beam to withstand the extrusion pressure in the direction of the first pressure-bearing section toward the main body wall. The overlapping surface of the first pressure-bearing section and the second pressure-bearing section is the welding surface, which is different from the direction of the welding surface in the related art. The welding surface in the present application is not parallel to the extrusion pressure, which can effectively reduce the risk of separation of the first pressure-bearing section and the second pressure-bearing section due to the extrusion pressure, and the first pressure-bearing section and the second pressure-bearing section can also increase the strength of withstanding the extrusion pressure due to the overlap. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0036] Figure 1 It is a cross-sectional schematic diagram of a battery box beam of the related art mentioned in the background technology;

[0037] Figure 2 is a schematic cross-sectional view of a battery box beam provided in an embodiment of the utility model;

[0038] Figure 3 It is a three-dimensional structural schematic diagram of a battery box provided by an embodiment of the utility model;

[0039] Figure 4 yes Figure 3 Schematic diagram of the explosion structure;

[0040] Figure 5 It is a schematic diagram of a top view of a battery box provided by an embodiment of the utility model;

[0041] Figure 6 yes Figure 3 An enlarged structural diagram of the middle mount;

[0042] Figure 7This is a three-dimensional structural schematic diagram of a battery module provided by an embodiment of the utility model;

[0043] Figure 8 yes Figure 7 Schematic diagram of the explosion structure.

[0044] Description of reference numerals:

[0045] 1. Battery box; 11. Rolling assembly; 111. Rolling side beam; 112. Anti-expansion beam; 113. First cross beam; 114. Second cross beam; 115. Fixed space; 12. First frame; 121. Anti-extrusion area; 13. Anti-extrusion beam; 14. Second frame; 15. Mounting part; 151. First mounting beam; 152. Second mounting beam; 1521. Hole; 153. Bushing; 154. Anti-rust gasket; 2 , bottom plate; 3, bottom guard plate; 4, liquid cooling plate; 5, battery cell module; 6, integrated busbar; 7, main body wall; 8, first roller pressure wall; 81, first pressure-bearing section; 811, first extension section; 812, second extension section; 813, first surface; 82, first connecting section; 83, buffer section; 831, support section; 832, abutment section; 9, second roller pressure wall; 91, second pressure-bearing section; 911, second surface; 92, second connecting section. DETAILED DESCRIPTION

[0046] 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, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the utility model, and are not used to limit the utility model. In the utility model, unless otherwise stated, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device.

[0047] See also Figure 1 The figure shows the cross-sectional structure of the battery box beam in the related technology described in the background technology. It can be seen from the figure that at the connection of the battery box beam on the right side, its connection surface is parallel to the expansion extrusion force. When the expansion extrusion force is too large, the connection at both ends of the battery box beam may be at risk of separation.

[0048] To do this, see Figure 2 , an embodiment of the present application provides a battery box beam, comprising:

[0049] Body wall 7;

[0050] A first roller pressure wall 8 is connected to one end of the main body wall 7. The first roller pressure wall 8 includes a first pressure-bearing section 81. The first pressure-bearing section 81 is arranged opposite to the main body wall 7.

[0051] The second roller pressing wall 9 is connected to the other end of the main body wall 7 . The second roller pressing wall 9 includes a second pressure-bearing section 91 . The second pressure-bearing section 91 is arranged opposite to the main body wall 7 , and extends toward and partially overlaps with the first pressure-bearing section 81 .

[0052] The technical solution provided by the present application is mainly to utilize the first pressure-bearing section 81 and the second pressure-bearing section 91 to extend toward each other and partially overlap, so that the welding surface is located in the overlapping part, and the extension toward each other makes the welding surface perpendicular to the direction of the extrusion force, effectively avoiding the risk of the welding surface being connected and separated due to the extrusion force. In addition, the welding surface is vertical, so that the first pressure-bearing section 81 and the second pressure-bearing section 91 overlap in the direction of resisting the extrusion force, thereby enhancing the ability to resist extrusion. In detail, first, the structure of the battery box beam is enclosed by connecting the main body wall 7, the first roller-pressed wall 8 and the second roller-pressed wall 9 to each other, and then the first pressure-bearing section 81 and the second pressure-bearing section 91 are arranged opposite to the main body wall 7, that is, the first pressure-bearing section 81 and the second pressure-bearing section 91 are located on the same side of the main body wall 7, and then the first pressure-bearing section 81 and the second pressure-bearing section 91 are extended toward each other and partially overlapped, thereby improving the ability of the battery box beam to withstand the extrusion pressure in the direction of the first pressure-bearing section 81 toward the main body wall 7. The overlapping surface of the first pressure-bearing section 81 and the second pressure-bearing section 91 is the welding surface, which is different from the direction of the welding surface in the related art. The welding surface in the present application is not parallel to the extrusion pressure, which can effectively reduce the risk of separation of the first pressure-bearing section 81 and the second pressure-bearing section 91 due to the extrusion pressure, and the first pressure-bearing section 81 and the second pressure-bearing section 91 can also increase the strength of withstanding the extrusion pressure due to the overlap.

[0053] In some embodiments, the first pressure-bearing section 81 includes a first extension section 811 and a second extension section 812 which are connected to each other and extend in the same direction. The second extension section 812 is closer to the main body wall 7 than the first extension section 811. The first extension section 811 and the second extension section 812 jointly define a lap joint. The end of the second pressure-bearing section 91 close to the first pressure-bearing section 81 is arranged at the lap joint and overlaps with the second extension section 812. The first extension section 811 and the second extension section 812 are connected in an arc shape and are integrally bent, which is conducive to improving the strength of the connection, and the bending transition is more rounded to avoid the connection being broken due to excessive bending angles. The second extension section 812 is closer to the main body wall 7 than the first extension section 811, which is equivalent to forming a fault at the first extension section 811 and the second extension section 812. The fault can be used as the overlapping position of the second pressure-bearing section 91 and the first pressure-bearing section 81, providing a overlapping position for the second pressure-bearing section 91 to avoid the formation of a more obvious bulge on one side of the battery box beam due to the overlap of the first pressure-bearing section 81 and the second pressure-bearing section 91 at the overlapping position, which may damage the battery cell module 5.

[0054] Furthermore, the first extension section 811 has a first surface 813 away from the main body wall 7, the second pressure section 91 has a second surface 911 away from the main body wall 7, and the first surface 813 and the second surface 911 are coplanar. The first surface 813 and the second surface 911 are coplanar, which can improve the flatness of the side of the battery box beam away from the main body wall 7, and avoid the problem of uneven force on the battery cell module 5 caused by the bulge on the side of the battery box beam.

[0055] In some embodiments, the first roller-pressed wall 8 also includes a first connecting section 82, which is connected between the first pressure-bearing section 81 and the main body wall 7, and the second roller-pressed wall 9 also includes a second connecting section 92, which is connected between the second pressure-bearing section 91 and the main body wall 7, and is arranged opposite to the first connecting section 82, and the main body wall 7, the first connecting section 82, the first pressure-bearing section 81, the second pressure-bearing section 91 and the second connecting end enclose the inner cavity of the beam. The first roller-pressed wall 8, the second roller-pressed wall 9 and the main body wall 7 are enclosed and connected to each other, so that the cross-section of the battery box beam is a rectangular structure. It should be noted that the connection between the main body wall 7 and the first connecting section 82 and the second connecting section 92 is an integrally formed connection, formed by bending. The connection between the first connecting section 82 and the first pressure-bearing section 81 is also an integrally bent connection. The connection between the second connecting section 92 and the second pressure-bearing section 91 is also an integrally bent connection. The first pressure-bearing section 81 and the second pressure-bearing section 91 are overlapped and welded and fixed. By connecting in this way, the battery box beam becomes a hollow structure, and the hole-making process is omitted, thereby achieving the purpose of reducing the weight of the box beam.

[0056] In some embodiments, the first roller pressure wall 8 also includes a buffer section 83, which is connected to the end of the first pressure section 81 near the second pressure section 91 and extends toward the main body wall 7. The buffer section 83 is configured to slide along the main body wall 7 when the first pressure section 81 and the second pressure section 91 are under pressure to buffer the pressure. The connection between the buffer section 83 and the first pressure section 81 is still a one-piece bending. The two ends of the buffer section 83 are respectively connected to the main body wall 7 and the first pressure section 81, which can play a role in supporting the first roller pressure wall 8, the second roller pressure wall 9 and the main body wall 7, and improve the ability of the battery box beam to withstand the extrusion force. And the buffer section 83 has a tendency to slide along the main body wall 7. When the extrusion force is too large, the buffer section 83 will deform and slide along the main body wall 7. Based on its force to restore the deformation, it plays a role in buffering the extrusion force and enhancing the resistance to the extrusion force.

[0057] Furthermore, the buffer section 83 includes a support section 831 and an abutment section 832, wherein the support section 831 is connected between the first pressure-bearing section 81 and the abutment section 832, and the abutment section 832 is parallel to and abuts the main body wall 7. The support section 831 serves to support and enhance the strength of the battery box beam. The abutment section 832 is parallel to and abuts the main body wall 7, which can increase the contact area between the abutment section 832 and the main body wall 7, and avoid excessive pressure of the abutment section 832 on the main body wall 7 due to a small contact area. Also, when the extrusion force is too large, the support section 831 will transfer the extrusion force to the abutment section 832, and the abutment section 832 will move along the main body wall 7, thereby causing the support section 831 to deform and tilt, thereby buffering the extrusion force.

[0058] Furthermore, the abutting section 832 extends in the opposite direction to the first pressure-bearing section 81 , so that the abutting section 832 is more sensitive to the size of the extrusion force. When subjected to a larger extrusion force, it can move along the main body wall 7 to drive the supporting section 831 to deform, thereby playing a buffering role.

[0059] It should be noted that the battery box beam is made of steel profiles, specifically 780DP steel profiles, and the production process is a roller pressing process. The wall thickness of the battery box beam is in the range of 1mm to 2mm. Compared with the use of aluminum profiles, it is beneficial to reduce costs and improve strength.

[0060] See also Figures 2 to 6 The present application also provides a battery box 1, the battery box 1 includes a first direction, and the battery box 1 includes:

[0061] The rolling assembly 11 encloses a fixed space 115 for fixing the battery cell module 5. The rolling assembly 11 includes two anti-expansion beams 112 arranged opposite to each other. The two anti-expansion beams 112 are arranged at relative intervals along the first direction. The two anti-expansion beams 112 are both battery box beams as described in the first aspect.

[0062] The battery box 1 is provided with the battery box beam described in any of the aforementioned embodiments as the anti-expansion beam 112, and utilizes the structure of the anti-expansion beam 112 to support and buffer the expansion and squeezing force, thereby effectively improving the anti-expansion capability of the battery box. For the specific beneficial effect derivation process, please refer to the aforementioned battery box beam embodiment, which will not be repeated here.

[0063] In some embodiments, the battery box 1 further includes a second direction, the first direction and the second direction intersect, and the rolling assembly 11 further includes:

[0064] Two roller-pressed side beams 111 are arranged opposite to each other along the second direction, and two ends of each anti-expansion beam 112 are respectively connected to the two roller-pressed side beams 111 to define a fixed space 115 .

[0065] For further information, see Figure 4 and Figure 5 , the two rolled side beams 111 are both battery box beams as described in any of the aforementioned embodiments, and the thickness of the two rolled side beams 111 is the same, and the thickness of the rolled side beams 111 is less than the thickness of the anti-expansion beam 112. By utilizing the structure of the battery box beam, the ability of the battery box 1 to resist the expansion and extrusion force of the battery cell expansion can be enhanced. And, the limitation that the thickness of the rolled side beam 111 is less than the thickness of the anti-expansion beam 112 is mainly based on the main expansion direction of the battery cell, that is, the main expansion direction of the battery cell is the first direction. It should also be noted that the thickness refers to the sum of the wall thickness of the main wall 7 of the battery box beam itself, the wall thickness of the pressure-bearing section arranged opposite to the main wall 7, and the spacing distance between the pressure-bearing section and the main wall 7.

[0066] In some embodiments, the rolling assembly 11 further includes:

[0067] At least one first cross beam 113 and at least one second cross beam 114, the first cross beam 113 and the second cross beam 114 are both located in a fixed space 115, the first cross beam 113 and the second cross beam 114 are cross-connected, the two ends of the first cross beam 113 are respectively connected to the two roller-pressed edge beams 111, and the two ends of the second cross beam 114 are respectively connected to the two anti-expansion beams 112.

[0068] By connecting two roll-pressed side beams 111 and two anti-expansion beams 112 to each other, a fixed space 115 is enclosed, which is mainly used to install and fix the battery cell module 5. The fixed space 115 enclosed in this way can accommodate large-sized battery cell modules 5. In some embodiments, by arranging a first cross beam 113 and a second cross beam 114 in the fixed space 115, and cross-connecting the first cross beam 113 and the second cross beam 114, the fixed space 115 is divided into a plurality of fixed sub-spaces, so that a plurality of battery cell modules 5 can be installed and fixed in the fixed space 115, and when each battery cell module 5 expands, each expanded battery cell module 5 will be subjected to an independent fixed extrusion force to suppress the expansion of each battery cell module 5. In addition, a plurality of battery cell modules 5 are arranged adjacent to each other and isolated by cross beams, that is, when the battery cell modules 5 are fixedly installed, the cross beams will be shared, and part of the expansion extrusion force of two adjacent battery cell modules 5 will be offset by acting on the same cross beam, which indirectly enhances the ability of the roll-pressed assembly 11 to suppress the expansion of the battery cell module 5.

[0069] It should be noted that the frame structure formed by connecting the rolled edge beam 111 and the anti-expansion beam 112 can be a rectangle, a rhombus or other closed quadrilaterals. Similarly, the fixed space 115 can also be a rectangle, a rhombus or other closed quadrilaterals. There is no limitation. It is mainly adjusted according to the structure of the battery module 5. Because the common structure of the battery module 5 is a rectangle, in this embodiment, the frame structure and the fixed space 115 are preferably rectangular. For the first cross beam 113 and the second cross beam 114, in this embodiment, one is used for each and cross-connected to divide the fixed space 115 into four fixed sub-spaces. In other embodiments, two first cross beams 113 and two second cross beams 114 can also be used and cross-connected to define more fixed sub-spaces for placing more battery modules 5.

[0070] In addition, the rolled side beam 111, the anti-expansion beam 112, the first cross beam 113 and the second cross beam 114 are all rolled by a rolling process, and are all hollow steel plate structures with a plate thickness of 1.0-2.0 mm, thereby meeting the requirements of lightweight battery modules. In addition, the cross-sections of the rolled side beam 111, the first cross beam 113, the second cross beam 114 and the anti-expansion beam 112 are all in the shape of a Japanese character, so as to improve the ability of each beam to withstand the expansion and extrusion force of the battery cell module 5.

[0071] In some embodiments, see Figure 4 and Figure 5The battery box 1 also includes a first frame 12, both sides of the first frame 12 are respectively connected to one side of two rolled edge beams 111, the first frame 12 and an anti-expansion beam 112 close to it are spaced apart to define an anti-extrusion area 121, and a plurality of anti-extrusion beams 13 are spaced apart in the anti-extrusion area 121, and both ends of each anti-extrusion beam 13 are respectively connected to the first frame 12 and the anti-expansion beam 112 close to the first frame 12.

[0072] By using the anti-expansion beams 112 instead of the frame to bear the extrusion force of the expansion of the battery cell module 5 and arranging a plurality of anti-extrusion beams 13 in the anti-extrusion area 121 , the effect of suppressing the expansion of the battery cell module 5 is further improved. In detail, since the battery module 5 has a tendency to expand in the first direction, the solution proposed in the present application is mainly to form a fixed space 115 by using the rolling assembly 11, and to form an anti-extrusion area 121 between the first frame 12 and the anti-expansion beam 112, so that the battery module 5 is installed in the fixed space 115 and will not directly contact the first frame 12, that is, the expansion extrusion force of the battery module 5 will not directly act on the first frame 12, effectively avoiding the deformation of the first frame 12; and an anti-extrusion beam 13 is arranged in the anti-extrusion area 121, and the rolling assembly 11 is connected to the first frame 12 by the anti-extrusion beam 13, so that the first frame 12 can not only enhance the strength of the rolling assembly 11 against the expansion extrusion force to a certain extent, but also avoid the first frame 12 from being deformed due to directly bearing the expansion extrusion force, and the anti-extrusion beam 13 can also enhance the strength of the rolling assembly 11. And the buffer section 83 provided in the anti-expansion beam 112 can also improve the anti-deformation ability of the anti-expansion beam 112 itself, thereby avoiding the transfer of the deformation extrusion force to the first frame 12. Furthermore, arranging the plurality of anti-extrusion beams 13 at intervals can, compared with arranging the anti-extrusion beams 13 directly and densely, prevent the anti-expansion beams 112 from transferring deformation to the first frame 12 to a certain extent.

[0073] In some embodiments, the battery case 1 also includes a second frame 14. The two ends of the second frame 14 are respectively connected to the two rolled edge beams 111 and are arranged opposite to the first frame 12, and the second frame 14 is spaced apart from the anti-expansion beam 112 close to it, and the spacing distance is greater than 5mm. Because the expansion range of the battery cell module 5 is 1-5mm, the spacing between the second frame 14 and the anti-expansion beam 112 close to it can be set to be more than 5mm, which can effectively prevent the anti-expansion beam 112 from moving or deforming and affecting the second frame 14. Specifically, the two ends of the rolled edge beam 111 extend along the second direction and are respectively located on the outside of the two anti-expansion beams 112, so that when the first frame 12 is connected to the rolled edge beam 111, the first frame 12 can form an anti-extrusion area 121 with the anti-expansion beam 112; and when the second frame 14 is connected to the rolled edge beam 111, the second frame 14 and the anti-expansion beam 112 are spaced apart. By setting the distance between the second frame 14 and the anti-expansion beam 112 to be greater than 5 mm, it can be ensured that when the anti-expansion beam 112 is displaced, it will not cause displacement influence on the second frame 14, thereby avoiding affecting the air tightness of the second frame 14.

[0074] It should be noted that, in this embodiment, the first frame 12 and the second frame 14 are both sheet metal stamping parts, which can reduce the weight and the hole opening cost compared to roll-pressed parts, because the sheet metal stamping parts only need to use a mold to open the hole, while the roll-pressed parts need to use a laser to cut the hole.

[0075] And, for the above-mentioned first direction and second direction, the first direction is the direction in which the battery cell module 5 expands, and the first direction intersects with the second direction. Preferably, the first direction is perpendicular to the second direction.

[0076] For further information, see Figure 2 and Figure 5, the roll-formed side beam 111, the anti-expansion beam 112, the first cross beam 113 and the second cross beam 114 are all of hollow steel plate structure and the plate thickness is 1.0 - 2.0 mm. The roll-formed side beam 111, the anti-expansion beam 112, the first cross beam 113 and the second cross beam 114 are all formed by bending a steel plate, and the hollow structure formed by bending is the through hole. The buffer sections 83 are respectively arranged in the through holes of the roll-formed side beam 111, the anti-expansion beam 112, the first cross beam 113 and the second cross beam 114. The buffer section 83 arranged in the roll-formed side beam 111 is integrally formed with the roll-formed side beam 111 and can be directly bent from a steel plate; the buffer section 83 arranged in the anti-expansion beam 112 is integrally formed with the anti-expansion beam 112 and can be directly bent from a steel plate; the buffer section 83 arranged in the first cross beam 113 is integrally formed with the first cross beam 113 and can be directly bent from a steel plate; the buffer section 83 arranged in the second cross beam 114 is integrally formed with the second cross beam 114 and can be directly bent from a steel plate. After being bent and formed, the cross-sections of the roll-formed side beam 111, the anti-expansion beam 112, the first cross beam 113 and the second cross beam 114 are all in the shape of a Chinese character 'Ri'. By using the roll-forming process to form a cross-section in the shape of a Chinese character 'Ri', compared with a completely hollow beam structure, the beam structure with a cross-section in the shape of a Chinese character 'Ri' has higher strength and can better withstand extrusion force. It should be noted that although the cross-sections of the roll-formed side beam 111 and the cross beam are both in the shape of a Chinese character 'Ri', the cross-sectional area of the roll-formed side beam 111 and the cross-sectional area of the cross beam can be different to form a size difference, and the size can be selected according to actual needs; and, the Chinese character 'Ri' mainly means that when observed as a whole, the cross-section is approximately in the shape of the Chinese character 'Ri', but the cross-sectional shapes of the roll-formed side beam 111 and the cross beam can be exactly the same shape of a Chinese character 'Ri' or not exactly the same shape of a Chinese character 'Ri', which is not limited.

[0077] Specifically, the plate thickness of the roll-formed side beam 111 is 1.2 to 1.5 mm, and in this embodiment, the preferred thickness is 1.3 mm. The plate thickness of the anti-expansion beam 112 is 1.5 - 2.0 mm, and in this embodiment, the preferred thickness is 1.7 mm. The plate thickness of the first cross beam 113 and the second cross beam 114 is 1.5 to 2.0 mm, and in this embodiment, the preferred thickness is 1.7 mm. By limiting the plate thicknesses of the roll-formed side beam 111, the anti-expansion beam 112 and the cross beam within the above corresponding thickness value ranges, it can not only ensure the strength of the roll-formed side beam 111 and the cross beam, but also avoid excessive difficulty in roll-forming.

[0078] In some embodiments, please refer to Figure 3 and Figure 6, a plurality of mounting members 15 are provided on the outer side of the rolled side beam 111, and the outer side refers to the side away from the fixed space 115. The plurality of mounting members 15 are arranged at intervals along the second direction, and are used to fix the battery box 1 to other external structures. Compared with directly fixing the rolled side beam 111 and the anti-expansion beam 112 to the external structure, the mounting members 15 can isolate the influence of the external structure on the rolled side beam 111 and the anti-expansion beam 112 to a certain extent, and protect the internal structure of the battery box 1 from unnecessary mechanical stress and damage.

[0079] Furthermore, the mounting member 15 includes a first mounting beam 151, a second mounting beam 152 and a bushing 153. The first mounting beam 151 is fixed to the outside of the rolled side beam 111 and the side of the first mounting beam 151 facing away from the rolled side beam 111 is embedded in the second mounting beam 152 to fix the second mounting beam 152. Specifically, one side of the second mounting beam 152 is open, one side of the first mounting beam 151 is embedded in the second mounting beam 152 through the opening, and the other side of the first mounting beam 151 extends to the outside of the second mounting beam 152 and is welded and fixed to the rolled side beam 111. Among them, the side of the first mounting beam 151 extending into the second mounting beam 152 is spaced from the inner side of the second mounting beam 152 to define a space for the bushing 153 to pass through. The second mounting beam 152 is fixedly connected to the rolling side beam 111 on one side facing the rolling side beam 111, and the connection method is welding or bonding. In this embodiment, welding is used. The second mounting beam 152 is provided with a sleeve hole 1521, and the bushing 153 is fixed to the second mounting beam 152 through the sleeve hole 1521. The sleeve 153 and the sleeve hole 1521 are interference fit.

[0080] For further information, see Figure 3 and Figure 6 , the mounting part 15 also includes an anti-rust gasket 154. In some embodiments, the anti-rust gasket 154 is a stainless steel sheet. The anti-rust gasket 154 is fixed to the side of the second mounting beam 152 away from the bushing 153 and is coaxially connected to the sleeve hole 1521. When the bolt passes through the bushing 153, it can coaxially pass through the anti-rust gasket 154 and connect with the nut on one side of the anti-rust gasket 154. In this embodiment, the anti-rust gasket 154 and the second mounting beam 152 are connected and fixed by welding. When the battery module is installed and locked with the vehicle, and the bolt and nut rotate in coordination, the setting of the anti-rust gasket 154 can effectively reduce the wear caused by the nut on the surface of the second mounting beam 152, and reduce the consumption of the electrophoretic anti-corrosion layer on the surface of the second mounting beam 152. And, even if the electrophoretic anti-corrosion layer of the anti-rust gasket 154 is exhausted, the surface of the anti-rust gasket 154 will not rust because it is made of stainless steel, which can effectively ensure the anti-corrosion performance of the battery module.

[0081] See also Figure 7 and Figure 8, the present application also provides a battery module, comprising:

[0082] Bottom plate 2;

[0083] A bottom guard plate 3 is provided on the bottom plate 2;

[0084] A liquid cooling plate 4 is provided on the bottom guard plate 3;

[0085] The battery box 1 as in any of the above embodiments is arranged on the liquid cooling plate 4;

[0086] A plurality of battery cell modules 5 are arranged in a fixed space 115 of the battery box 1;

[0087] An integrated busbar 6 is provided on the plurality of battery core modules 5;

[0088] The insulating layer is provided on a side of the integrated busbar 6 facing away from the battery module 5;

[0089] The box cover is arranged on the battery module, and the insulating layer is located between the box cover and the integrated busbar 6.

[0090] It should be noted that, because the battery module includes the battery case 1 in any of the above embodiments, the battery module has similar beneficial effects as the battery case 1. For the specific derivation process of the beneficial effects, please refer to the embodiment of the battery case 1 part, which will not be repeated here.

[0091] The embodiments of the present invention are described in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for technicians in this field, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A battery box beam, characterized in that: include: body wall; A first roller pressure wall connected to one end of the main body wall, the first roller pressure wall comprising a first pressure-bearing section, the first pressure-bearing section being arranged opposite to the main body wall; The second roller pressure wall is connected to the other end of the main body wall. The second roller pressure wall includes a second pressure-bearing section. The second pressure-bearing section is arranged opposite to the main body wall and extends toward and partially overlaps with the first pressure-bearing section.

2. The battery box beam according to claim 1, characterized in that: The first pressure-bearing section includes a first extension section and a second extension section which are interconnected and extend in the same direction. The second extension section is closer to the main body wall than the first extension section. The first extension section and the second extension section jointly define a lap joint. The end of the second pressure-bearing section close to the first pressure-bearing section is arranged on the lap joint and overlaps with the second extension section.

3. The battery box beam according to claim 2, characterized in that: The first extension section has a first surface facing away from the main body wall, the second pressure-bearing section has a second surface facing away from the main body wall, and the first surface is coplanar with the second surface.

4. The battery box beam according to claim 1, characterized in that: The first roller-pressed wall also includes a first connecting section, which is connected between the first pressure-bearing section and the main body wall. The second roller-pressed wall also includes a second connecting section, which is connected between the second pressure-bearing section and the main body wall and is arranged opposite to the first connecting section. The main body wall, the first connecting section, the first pressure-bearing section, the second pressure-bearing section and the second connecting section enclose an inner cavity of the beam.

5. The battery box beam according to any one of claims 1 to 4, characterized in that: The first roller pressure wall also includes a buffer section, which is connected to the end of the first pressure-bearing section close to the second pressure-bearing section and extends toward the main body wall. The buffer section is configured to support the first pressure-bearing section and the second pressure-bearing section when the first pressure-bearing section and the second pressure-bearing section are under pressure, and to slide along the main body wall to buffer the extrusion force.

6. The battery box beam according to claim 5, characterized in that: The buffer section includes a supporting section and an abutting section, the supporting section is connected between the first pressure-bearing section and the abutting section, and the abutting section is parallel to and abuts against the main body wall.

7. The battery box beam according to claim 6, characterized in that: The abutting section extends in opposite directions to the first pressure-bearing section.

8. The battery box beam according to claim 1, characterized in that: The battery box beam is a rolled steel beam with a wall thickness between 1 mm and 2 mm.

9. A battery box, characterized in that: The battery box includes a first direction, and the battery box includes: A rolling assembly encloses a fixed space for fixing a battery cell module, the rolling assembly includes two anti-expansion beams arranged opposite to each other, the two anti-expansion beams are arranged at relative intervals along the first direction, and the two anti-expansion beams are both battery box beams as described in any one of claims 1 to 8.

10. The battery case according to claim 9, characterized in that: The battery box further includes a second direction, the first direction and the second direction intersect, and the rolling assembly further includes: Two roller-pressed side beams are arranged opposite to each other along the second direction, and two ends of each anti-expansion beam are respectively connected to the two roller-pressed side beams to define the fixed space.

11. The battery case according to claim 10, characterized in that: The two rolled side beams are both the battery box beams, the two rolled side beams have the same thickness, and the thickness of the rolled side beam is less than the thickness of the anti-expansion beam.

12. The battery case according to claim 10, characterized in that: The rolling assembly also includes: At least one first cross beam and at least one second cross beam, the first cross beam and the second cross beam are both located in the fixed space, the first cross beam is cross-connected with the second cross beam, the two ends of the first cross beam are respectively connected to the two roller-pressed edge beams, and the two ends of the second cross beam are respectively connected to the two anti-expansion beams.

13. The battery case according to claim 10, characterized in that: The battery box body also includes a first frame, and the two sides of the first frame are respectively connected to one side of the two rolled side beams, and the first frame is spaced apart from a battery box beam adjacent to it to define an anti-extrusion area, and a plurality of anti-extrusion beams are spaced apart in the anti-extrusion area, and the two ends of each anti-extrusion beam are respectively connected to the first frame and the anti-expansion beam adjacent to the first frame.

14. The battery case according to claim 13, characterized in that: The battery box also includes a second frame, which is arranged opposite to the first frame, and the two ends of the second frame are respectively connected to the two rolled edge beams, and the second frame is spaced apart from an anti-expansion beam adjacent to it, and the spacing distance is greater than 5mm.

15. A battery module, characterized in that: include: Base plate; A bottom guard plate, arranged on the bottom plate; A liquid cooling plate, arranged on the bottom guard plate; The battery box according to any one of claims 9 to 14, arranged on the liquid cooling plate; A plurality of battery cell modules are arranged in a fixed space of the battery box; An integrated busbar, provided on the plurality of battery core modules; An insulating layer is provided on a side of the integrated busbar away from the battery module; A box cover is arranged on the battery module, and the insulating layer is located between the box cover and the integrated busbar.

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