Frame, frame processing method and battery pack box body

Abstract

The invention relates to the technical field of battery packs, and discloses a frame, a frame processing method and a battery pack box body, and the frame comprises a rolling pipe body which extends along a first direction and is provided with a plurality of gaps at intervals along the first direction, so that the rolling pipe body forms a plurality of sections of beam main bodies which are arranged in sections, a plugging sheet is formed on the remaining part, corresponding to the notch, of the rolling pipe body; the rolling pipe body is arranged at the connecting position of the plugging piece and the beam body in a bent mode so that the plugging piece can be connected with the end of the beam body, and the two ends, in the first direction, of the rolling pipe body are connected. The frame is formed by integrally bending the rolled pipe body, so that the sealing performance of the frame is ensured, the welding process between the adjacent boundary beams of the frame is greatly reduced, the welding thermal deformation of the frame is reduced, the planeness and size of the frame are effectively improved, and the qualification rate of the frame is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery packs, and in particular to a frame, a method for processing the frame, and a battery pack box. Background Art

[0002] As an energy storage device, the power battery pack is a core component of hybrid vehicles and electric vehicles. The battery pack is mainly composed of a box and a number of battery modules arranged in the box. The box is usually composed of a frame, a cover plate, a water cooling plate, etc. In the prior art, the frame is usually formed by a plurality of long strips of profiles as side beams, and welding is performed at the joints of adjacent long strips of profiles, resulting in too many welding positions, generating a large amount of welding heat, causing large welding thermal deformation, and affecting the overall flatness and size pass rate of the frame. Summary of the invention

[0003] In view of this, the present invention provides a frame, a frame processing method and a battery pack box to solve the problem of low pass rate of overall flatness and size of the frame in the prior art.

[0004] In the first aspect, the present invention provides a frame, comprising: a rolled tube body, extending along a first direction, the rolled tube body having a plurality of notches arranged at intervals along the first direction so that the rolled tube body forms a multi-segment beam body arranged in segments, and a sealing piece is formed on the remaining part of the rolled tube body corresponding to the notches; the rolled tube body is bent at the connection between the sealing piece and the beam body so that the sealing piece is connected to the end of the beam body, and the two ends of the rolled tube body along the first direction are connected.

[0005] In an optional embodiment, the rolled tube body includes a first tube wall, a second tube wall, a third tube wall and a fourth tube wall which are arranged in an enclosed connection, the second tube wall and the fourth tube wall are arranged relatively spaced apart, the first tube wall and the third tube wall are arranged relatively spaced apart, the fourth tube wall is continuously arranged along the first direction, the first tube wall, the second tube wall and the third tube wall are all arranged in multiple sections spaced apart along the first direction, the correspondingly arranged first tube wall, the second tube wall, the third tube wall and the fourth tube wall enclose to form the beam body, and the sealing piece is formed at the fourth tube wall connected to the end of the beam body.

[0006] In an optional embodiment, the multi-section beam body includes a front beam, a left beam, a rear beam and a right beam which are arranged in sequence, a first blocking piece is arranged between the front beam and the left beam, a second blocking piece is arranged between the left beam and the rear beam, a third blocking piece is arranged between the rear beam and the right beam, and a fourth blocking piece is arranged at the end of the front beam away from the left beam; the rolled tube body is bent at the connection between the first blocking piece and the left beam, the connection between the second blocking piece and the left beam, and the connection between the third blocking piece and the right beam, the first blocking piece is connected to an end of the left beam close to the front beam, the second blocking piece is connected to an end of the left beam close to the rear beam, the third blocking piece is connected to an end of the right beam close to the rear beam, and the fourth blocking piece is connected to an end of the right beam away from the rear beam.

[0007] In an optional embodiment, the first tube wall and the third tube wall of the left beam are welded to the first blocking piece at their ends near the front beam, the first tube wall and the third tube wall of the left beam are welded to the second blocking piece at their ends near the rear beam, the first tube wall and the third tube wall of the right beam are welded to the third blocking piece at their ends near the rear beam, and the first tube wall and the third tube wall of the right beam are welded to the fourth blocking piece at their ends away from the rear beam.

[0008] In an optional embodiment, the rolled tube body is bent, and one end of the front beam close to the left beam is connected to the outer surface of the second tube wall of the left beam, one end of the rear beam close to the left beam is connected to the outer surface of the second tube wall of the left beam, one end of the rear beam away from the left beam is connected to the outer surface of the second tube wall of the right beam, and one end of the front beam away from the left beam is connected to the outer surface of the second tube wall of the right beam.

[0009] In an optional embodiment, the ends of the first tube wall, the second tube wall and the third tube wall of the front beam close to the left beam are welded to the outer surface of the second tube wall of the left beam, the ends of the first tube wall, the second tube wall and the third tube wall of the rear beam close to the left beam are welded to the outer surface of the second tube wall of the left beam, the ends of the first tube wall, the second tube wall and the third tube wall of the rear beam away from the left beam are welded to the outer surface of the second tube wall of the right beam, and the ends of the first tube wall, the second tube wall and the third tube wall of the front beam away from the left beam are welded to the outer surface of the second tube wall of the right beam.

[0010] In an optional embodiment, the blocking piece covers the end of the beam body and is adapted to the end profile of the beam body.

[0011] In a second aspect, the present invention further provides a method for processing a frame, which is used to process the above-mentioned frame, comprising the steps of:

[0012] Rolling the plate body to form a rolled base pipe;

[0013] Cutting the rolled base pipe to form a plurality of notches according to predetermined positions to obtain a rolled pipe body having a beam body and a plugging piece;

[0014] The rolled tube body is bent at the connection between the plugging piece and the beam body, so that the plugging piece is connected to the end of the beam body, and the two ends of the rolled tube body are connected.

[0015] In an optional embodiment, the rolled base pipe is a square pipe structure; the rolled base pipe is cut according to predetermined positions to form a plurality of notches to obtain a rolled pipe body having a beam body and a plugging piece, comprising the steps of:

[0016] Three of the tube walls of the rolled base tube are partially cut off at predetermined positions to form notches at the cut-off positions, and the remaining parts of the three tube walls form a first tube wall, a second tube wall and a third tube wall. The other tube wall that has not been cut off is a fourth tube wall. The corresponding first tube wall, second tube wall, third tube wall and fourth tube wall are combined to form a beam body, and the sealing piece is formed at the fourth tube wall connected to the end of the beam body.

[0017] In a third aspect, the present invention further provides a battery box, comprising the above-mentioned frame.

[0018] The technical solution of this application has the following advantages:

[0019] The frame of the present invention is formed by rolling the tube body in one piece and bending, which greatly reduces the welding process between adjacent side beams of the frame while ensuring the sealing performance of the frame, thereby reducing the welding thermal deformation of the frame, effectively improving the flatness and size of the frame, and improving the qualified rate of the frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A front view of a rolled base pipe according to an embodiment of the present invention;

[0022] Figure 2 It is a front view of a rolled tube (without bending) according to an embodiment of the present invention;

[0023] Figure 3 This is a front view of the rolled tube body after the first bending of the embodiment of the present invention;

[0024] Figure 4 This is a front view of the rolled tube body after the second bending of the embodiment of the present invention;

[0025] Figure 5 This is a front view of the rolled tube body after the third bending of the embodiment of the present invention;

[0026] Figure 6 for Figure 2 Schematic diagram of the cross-sectional structure in the AA direction.

[0027] Description of reference numerals:

[0028] 1. Rolled tube body; 11. Beam body; 111. Front beam; 112. Left beam; 113. Rear beam; 114. Right beam; 12. Sealing piece; 121. First sealing piece; 122. Second sealing piece; 123. Third sealing piece; 124. Fourth sealing piece; 13. First tube wall; 14. Second tube wall; 15. Third tube wall; 16. Fourth tube wall; 2. Notch; 100. Rolled base tube. 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 those skilled in the art without creative work are within the scope of protection of the present invention.

[0030] Combine the following Figures 1 to 6 , describing an embodiment of the present invention.

[0031] According to an embodiment of the present invention, on the one hand, a frame is provided, comprising a rolled tube body 1, the rolled tube body 1 extending along a first direction, a plurality of notches 2 arranged at intervals along the first direction on the rolled tube body 1, so that the rolled tube body 1 forms a multi-segment beam body 11 arranged in sections, and a blocking piece 12 is formed at the remaining portion of the rolled tube body 1 corresponding to the notches 2. The rolled tube body 1 is bent at the connection between the blocking piece 12 and the beam body 11, so that the blocking piece 12 is connected to the end of the beam body 11, and the two ends of the rolled tube body 1 along the first direction are connected.

[0032] The frame of this embodiment is formed by integrally bending a rolled tube body 1, which greatly reduces the welding process between adjacent side beams of the frame while ensuring the sealing performance of the frame, thereby reducing the welding thermal deformation of the frame, effectively improving the flatness and size of the frame, and improving the pass rate of the frame.

[0033] Specifically, in this embodiment, if Figures 1 to 5As shown, the beam body 11 is provided with four sections, and four blocking pieces 12 are provided, so that the frame formed by processing is a square frame with four side beams. Of the two ends of the rolled tube body 1 along the first direction, one end is the blocking piece 12, and the other end is the end of the beam body 11.

[0034] It is worth noting that in the related art, the frame is formed by welding four independently set side beams end to end. Welding penetration or slight air holes are prone to occur at the overlap of adjacent side beams corresponding to the four corners of the frame, resulting in a lower airtightness qualification rate, and difficulty in leak detection of the frame, affecting the production cycle. At the same time, the overlap of adjacent side beams corresponding to the four corners of the frame along the Z direction ( Figure 5 The height difference between the frame and the other parts of the battery pack (the direction perpendicular to the drawing) is likely to cause different degrees of height difference. When the height difference is too large, it is not conducive to the coordination between the frame and the other parts of the battery pack case (such as the water cooling plate), and it is easy to cause a gap between the frame and the matching parts, which in turn leads to poor airtightness of the battery pack case, causing the battery pack case to be scrapped and wasting production resources. In addition, in order to ensure the airtightness of the four corners of the frame, the four corners of the frame can be sealed separately, such as by applying sealant or installing additional sealing sheets. Although this can improve the sealing effect of the four corners of the frame, it will complicate the processing procedures of the frame and reduce processing efficiency.

[0035] Therefore, in this embodiment, if Figures 1 to 5 As shown, the plate body is processed by a roll forming process to form a roll-formed base tube 100, and then a notch 2 is processed on the roll-formed base tube 100 to form a roll-formed tube body 1. Finally, the roll-formed tube body 1 is welded at the corresponding positions of the bend and the butt joints of the two ends of the roll-formed tube body 1 by an integrated bending process, so as to form a frame. In this way, firstly, the frame is formed by bending the roll-formed tube body 1. Compared with the scheme in the related art, the welding positions are reduced at the four corners of the frame, so that the heat generated by welding can be reduced, and then the welding thermal deformation is reduced, so that the processed frame has better flatness and size. Secondly, each beam body 11 (that is, the side beam) of the frame is formed by a roll-formed base tube 100, and the adjacent beam bodies 11 are connected by a blocking sheet 12. After the roll-formed tube body 1 is bent and formed, the height difference along the Z direction of the overlap of the adjacent side beams corresponding to the four corners of the frame can be effectively eliminated, which is more conducive to the cooperation between the frame and the other components, and the airtightness of the battery pack box is ensured. Furthermore, the blocking piece 12 and the beam body 11 are an integrated structure, and the air tightness of the frame can be ensured without additionally applying sealant or installing the blocking piece 12, which simplifies the processing of the frame and improves the processing efficiency.

[0036] In one embodiment, Figure 6As shown, the rolled tube body 1 includes a first tube wall 13, a second tube wall 14, a third tube wall 15 and a fourth tube wall 16 which are arranged in an enclosed connection. The second tube wall 14 and the fourth tube wall 16 are arranged relatively spaced apart, the first tube wall 13 and the third tube wall 15 are arranged relatively spaced apart, the fourth tube wall 16 is continuously arranged along the first direction, the first tube wall 13, the second tube wall 14 and the third tube wall 15 are all arranged in multiple sections spaced apart along the first direction, the correspondingly arranged first tube wall 13, the second tube wall 14, the third tube wall 15 and the fourth tube wall 16 enclose to form a beam body 11, and a blocking piece 12 is formed at the fourth tube wall 16 connected to the end of the beam body 11.

[0037] It is worth noting that the rolled base tube 100 is a square tube structure, that is, the rolled base tube 100 includes four tube walls, three of which are partially cut off to form a gap 2, and the remaining parts of the three tube walls are respectively the first tube wall 13, the second tube wall 14 and the third tube wall 15 of the rolled tube body 1, and the other tube wall that is not cut off is the fourth tube wall 16 of the rolled tube body 1.

[0038] It should be noted that the portion of the fourth tube wall 16 corresponding to the first tube wall 13 , the second tube wall 14 and the third tube wall 15 is used to enclose the beam body 11 , and the portion of the fourth tube wall 16 extending out of the beam body 11 serves as the blocking piece 12 .

[0039] In one embodiment, Figure 2 As shown, the multi-section beam body 11 includes a front beam 111, a left beam 112, a rear beam 113 and a right beam 114 which are arranged in sequence, a first blocking piece 121 is arranged between the front beam 111 and the left beam 112, a second blocking piece 122 is arranged between the left beam 112 and the rear beam 113, a third blocking piece 123 is arranged between the rear beam 113 and the right beam 114, and a fourth blocking piece 124 is arranged at the end of the front beam 111 away from the left beam 112.

[0040] In one embodiment, Figures 3 to 5 As shown, the rolled tube body 1 is bent at the connection between the first blocking piece 121 and the left beam 112, the connection between the second blocking piece 122 and the left beam 112, and the connection between the third blocking piece 123 and the right beam 114. The first blocking piece 121 is connected to the end of the left beam 112 close to the front beam 111, the second blocking piece 122 is connected to the end of the left beam 112 close to the rear beam 113, the third blocking piece 123 is connected to the end of the right beam 114 close to the rear beam 113, and the fourth blocking piece 124 is connected to the end of the right beam 114 away from the rear beam 113. For details, please refer to Figure 5 The first blocking piece 121 is connected to the upper end of the left beam 112 , the second blocking piece 122 is connected to the lower end of the left beam 112 , the third blocking piece 123 is connected to the lower end of the right beam 114 , and the fourth blocking piece 124 is connected to the upper end of the right beam 114 .

[0041] Further, the first tube wall 13 and the third tube wall 15 of the left beam 112 are welded to the first blocking piece 121 at their ends near the front beam 111, the first tube wall 13 and the third tube wall 15 of the left beam 112 are welded to the second blocking piece 122 at their ends near the rear beam 113, the first tube wall 13 and the third tube wall 15 of the right beam 114 are welded to the third blocking piece 123 at their ends near the rear beam 113, and the first tube wall 13 and the third tube wall 15 of the right beam 114 are welded to the fourth blocking piece 124 at their ends away from the rear beam 113. For details, please refer to Figure 5 The upper ends of the first tube wall 13 and the third tube wall 15 of the left beam 112 are welded to the first blocking piece 121, the lower ends of the first tube wall 13 and the third tube wall 15 of the left beam 112 are welded to the second blocking piece 122, the lower ends of the first tube wall 13 and the third tube wall 15 of the right beam 114 are welded to the third blocking piece 123, and the upper ends of the first tube wall 13 and the third tube wall 15 of the right beam 114 are welded to the fourth blocking piece 124.

[0042] In one embodiment, Figure 5 As shown, the rolled tube body 1 is bent, the end of the front beam 111 close to the left beam 112 is connected to the outer surface of the second tube wall 14 of the left beam 112, the end of the rear beam 113 close to the left beam 112 is connected to the outer surface of the second tube wall 14 of the left beam 112, the end of the rear beam 113 away from the left beam 112 is connected to the outer surface of the second tube wall 14 of the right beam 114, and the end of the front beam 111 away from the left beam 112 is connected to the outer surface of the second tube wall 14 of the right beam 114. For details, please refer to Figure 5 The left end of the front beam 111 is connected to the outer surface of the second tube wall 14 of the left beam 112, the left end of the rear beam 113 is connected to the outer surface of the second tube wall 14 of the left beam 112, the right end of the rear beam 113 is connected to the outer surface of the second tube wall 14 of the right beam 114, and the right end of the front beam 111 is connected to the outer surface of the second tube wall 14 of the right beam 114.

[0043] Further, the ends of the first tube wall 13, the second tube wall 14 and the third tube wall 15 of the front beam 111 close to the left beam 112 are welded to the outer surface of the second tube wall 14 of the left beam 112, the ends of the first tube wall 13, the second tube wall 14 and the third tube wall 15 of the rear beam 113 close to the left beam 112 are welded to the outer surface of the second tube wall 14 of the left beam 112, the ends of the first tube wall 13, the second tube wall 14 and the third tube wall 15 of the rear beam 113 away from the left beam 112 are welded to the outer surface of the second tube wall 14 of the right beam 114, and the ends of the first tube wall 13, the second tube wall 14 and the third tube wall 15 of the front beam 111 away from the left beam 112 are welded to the outer surface of the second tube wall 14 of the right beam 114. For details, please refer to Figure 5The left ends of the first tube wall 13, the second tube wall 14 and the third tube wall 15 of the front beam 111 are welded to the outer surface of the second tube wall 14 of the left beam 112, the left ends of the first tube wall 13, the second tube wall 14 and the third tube wall 15 of the rear beam 113 are welded to the outer surface of the second tube wall 14 of the left beam 112, the right ends of the first tube wall 13, the second tube wall 14 and the third tube wall 15 of the rear beam 113 are welded to the outer surface of the second tube wall 14 of the right beam 114, and the right ends of the first tube wall 13, the second tube wall 14 and the third tube wall 15 of the front beam 111 are welded to the outer surface of the second tube wall 14 of the right beam 114.

[0044] In one embodiment, the blocking piece 12 covers the end of the beam body 11 and is adapted to the end profile of the beam body 11 .

[0045] It is worth noting that, in the present embodiment, the end contours of the beam body 11 are all square, and correspondingly, the blocking piece 12 is also a square piece structure.

[0046] According to an embodiment of the present invention, on the other hand, a method for processing a frame is also provided, which is used to process the above-mentioned frame, comprising the steps of:

[0047] Rolling the plate body to form a rolled base tube 100;

[0048] The rolled base pipe 100 is cut to form a plurality of notches 2 according to predetermined positions, so as to obtain a rolled pipe body 1 having a beam body 11 and a plugging piece 12;

[0049] The rolled tube body 1 is bent at the connection between the blocking piece 12 and the beam body 11 , so that the blocking piece 12 is connected to the end of the beam body 11 , and the two ends of the rolled tube body 1 are connected.

[0050] It is worth noting that, in this embodiment, the plate body used for rolling the base pipe is a steel plate.

[0051] In one embodiment, the rolled base pipe 100 is a square pipe structure; the rolled base pipe 100 is cut according to predetermined positions to form a plurality of notches 2 to obtain a rolled pipe body 1 having a beam body 11 and a blocking piece 12, comprising the steps of:

[0052] Three of the tube walls of the rolled base tube 100 are partially cut off at predetermined positions to form a notch 2 at the cut-off position, and the remaining parts of the three tube walls form a first tube wall 13, a second tube wall 14 and a third tube wall 15. The other tube wall that is not cut off is a fourth tube wall 16. The corresponding first tube wall 13, the second tube wall 14, the third tube wall 15 and the fourth tube wall 16 are enclosed to form a beam body 11, and a blocking piece 12 is formed at the fourth tube wall 16 connected to the end of the beam body 11.

[0053] Specifically, in this embodiment, a rolled base pipe 100 of appropriate length is taken and cut at appropriate positions according to the required lengths of multiple sections of the beam body 11, that is, the lengths of the front beam 111, the rear beam 113, the left beam 112, and the right beam 114, to form four sections of the beam body 11 and four blocking pieces 12.

[0054] In one embodiment, the above-mentioned bending of the rolled tube body 1 at the connection between the blocking piece 12 and the beam body 11 includes the following steps:

[0055] like Figure 3 As shown, the connection between the first blocking piece 121 and the left beam 112 is bent so that the first blocking piece 121 covers the end of the left beam 112 close to the front beam 111;

[0056] like Figure 4 As shown, the second blocking piece 122 and the left beam 112 are bent at the connection point, so that the second blocking piece 122 covers the end of the left beam 112 away from the front beam 111;

[0057] like Figure 5 As shown, the third blocking piece 123 and the right beam 114 are bent at the connection so that the third blocking piece 123 covers the end of the right beam 114 close to the rear beam 113 , and the fourth blocking piece 124 covers the end of the right beam 114 away from the rear beam 113 .

[0058] In one embodiment, the above-mentioned method of connecting the blocking piece 12 to the end of the beam body 11 and connecting the two ends of the rolled tube body 1 includes the following steps:

[0059] The ends of the first tube wall 13 and the third tube wall 15 of the left beam 112 close to the front beam 111 are welded to the first blocking piece 121, the ends of the first tube wall 13 and the third tube wall 15 of the left beam 112 close to the rear beam 113 are welded to the second blocking piece 122, the ends of the first tube wall 13 and the third tube wall 15 of the right beam 114 close to the rear beam 113 are welded to the third blocking piece 123, and the ends of the first tube wall 13 and the third tube wall 15 of the right beam 114 away from the rear beam 113 are welded to the fourth blocking piece 124;

[0060] The ends of the first tube wall 13, the second tube wall 14 and the third tube wall 15 of the front beam 111 close to the left beam 112 are welded to the outer surface of the second tube wall 14 of the left beam 112, the ends of the first tube wall 13, the second tube wall 14 and the third tube wall 15 of the rear beam 113 close to the left beam 112 are welded to the outer surface of the second tube wall 14 of the left beam 112, the ends of the first tube wall 13, the second tube wall 14 and the third tube wall 15 of the rear beam 113 away from the left beam 112 are welded to the outer surface of the second tube wall 14 of the right beam 114, and the ends of the first tube wall 13, the second tube wall 14 and the third tube wall 15 of the front beam 111 away from the left beam 112 are welded to the outer surface of the second tube wall 14 of the right beam 114.

[0061] According to an embodiment of the present invention, in another aspect, a battery box is provided, comprising the above-mentioned frame.

[0062] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A frame, characterized in that: include: A rolled tube body is extended along a first direction, and a plurality of notches are arranged on the rolled tube body at intervals along the first direction so that the rolled tube body forms a multi-segment beam body arranged in segments, and a sealing piece is formed on the remaining part of the rolled tube body corresponding to the notches; the rolled tube body is bent at the connection between the sealing piece and the beam body so that the sealing piece is connected to the end of the beam body, and the two ends of the rolled tube body along the first direction are connected.

2. The frame according to claim 1, characterized in that: The rolled tube body includes a first tube wall, a second tube wall, a third tube wall and a fourth tube wall which are arranged in an enclosed connection. The second tube wall and the fourth tube wall are arranged relatively spaced apart, the first tube wall and the third tube wall are arranged relatively spaced apart, the fourth tube wall is continuously arranged along a first direction, and the first tube wall, the second tube wall and the third tube wall are all arranged in multiple sections spaced apart along the first direction. The correspondingly arranged first tube wall, the second tube wall, the third tube wall and the fourth tube wall enclose to form the beam body, and the sealing piece is formed at the fourth tube wall connected to the end of the beam body.

3. The frame according to claim 2, characterized in that: The multi-section beam body comprises a front beam, a left beam, a rear beam and a right beam which are arranged in sequence, a first blocking piece is arranged between the front beam and the left beam, a second blocking piece is arranged between the left beam and the rear beam, a third blocking piece is arranged between the rear beam and the right beam, and a fourth blocking piece is arranged at one end of the front beam away from the left beam; The rolled tube body is bent at the connection between the first blocking piece and the left beam, the connection between the second blocking piece and the left beam, and the connection between the third blocking piece and the right beam. The first blocking piece is connected to an end of the left beam close to the front beam, the second blocking piece is connected to an end of the left beam close to the rear beam, the third blocking piece is connected to an end of the right beam close to the rear beam, and the fourth blocking piece is connected to an end of the right beam away from the rear beam.

4. The frame according to claim 3, characterized in that: The first tube wall and the third tube wall of the left beam are welded to the first blocking piece at their ends close to the front beam, the first tube wall and the third tube wall of the left beam are welded to the second blocking piece at their ends close to the rear beam, the first tube wall and the third tube wall of the right beam are welded to the third blocking piece at their ends close to the rear beam, and the first tube wall and the third tube wall of the right beam are welded to the fourth blocking piece at their ends away from the rear beam.

5. The frame according to claim 3, characterized in that: The rolled tube body is bent, one end of the front beam close to the left beam is connected to the outer surface of the second tube wall of the left beam, one end of the rear beam close to the left beam is connected to the outer surface of the second tube wall of the left beam, one end of the rear beam away from the left beam is connected to the outer surface of the second tube wall of the right beam, and one end of the front beam away from the left beam is connected to the outer surface of the second tube wall of the right beam.

6. The frame according to claim 5, characterized in that: The ends of the first tube wall, the second tube wall and the third tube wall of the front beam close to the left beam are welded to the outer surface of the second tube wall of the left beam, the ends of the first tube wall, the second tube wall and the third tube wall of the rear beam close to the left beam are welded to the outer surface of the second tube wall of the left beam, the ends of the first tube wall, the second tube wall and the third tube wall of the rear beam away from the left beam are welded to the outer surface of the second tube wall of the right beam, and the ends of the first tube wall, the second tube wall and the third tube wall of the front beam away from the left beam are welded to the outer surface of the second tube wall of the right beam.

7. The frame according to any one of claims 1 to 6, characterized in that: The blocking piece covers the end of the beam body and is adapted to the end profile of the beam body.

8. A method for processing a frame, used for processing the frame according to any one of claims 1 to 7, characterized in that: Includes steps: Rolling the plate body to form a rolled base pipe; The rolled base pipe is cut to form a plurality of notches according to predetermined positions to obtain a rolled pipe body having a beam body and a plugging piece; The rolled tube body is bent at the connection between the plugging piece and the beam body, so that the plugging piece is connected to the end of the beam body, and the two ends of the rolled tube body are connected.

9. The method for processing a frame according to claim 8, characterized in that: The rolled base pipe is a square pipe structure; the rolled base pipe is cut according to predetermined positions to form a plurality of notches to obtain a rolled pipe body having a beam body and a plugging piece, comprising the steps of: Three of the tube walls of the rolled base tube are partially cut off at predetermined positions to form notches at the cut-off positions, and the remaining parts of the three tube walls form a first tube wall, a second tube wall and a third tube wall. The other tube wall that has not been cut off is a fourth tube wall. The corresponding first tube wall, second tube wall, third tube wall and fourth tube wall are combined to form a beam body, and the sealing piece is formed at the fourth tube wall connected to the end of the beam body.

10. A battery box, characterized in that: The frame comprises the frame described in any one of claims 1 to 7.

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