Box body beam, battery pack box body and battery pack

Abstract

A box body beam (100), a battery pack box body (200) and a battery pack (300), which ameliorate the technical problem in the prior art that whole plate structures of box body beams result in long manufacturing periods. The box body beam (100) comprises a first main body (10) and a second main body (20), the second main body (20) being arranged to separate from the first main body (10); at least one of the cross section of the first main body (10) and the cross section of the second main body (20) is provided with an opening (K), the first main body (10) and the second main body (20) being connected at two sides of the opening (K) and sealing the opening (K).

Description

Box beam, battery pack box and battery pack

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on March 1, 2024, with application number 202420408482.3. The entire contents of the above application are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of battery technology, and in particular to a box beam, a battery pack box and a battery pack. Background Art

[0003] The battery pack box is usually used to place and protect battery cells, and the box beam is an important component of the battery pack box. SUMMARY OF THE INVENTION

[0004] However, box beams usually need to be made through special roll-forming molds, but the cost of roll-forming mold production lines is high and the development cycle is long, which makes it difficult to meet the cycle requirements of rapid development projects.

[0005] In related technologies, box beams are often processed from a whole plate. Since the whole plate needs to be bent multiple times and enclosed to form a box beam with closed side openings, it can only be processed using a rolling mold, which prolongs the manufacturing cycle of the box beam.

[0006] The present application provides a box beam, which includes a first main body and a second main body; the second main body is separately arranged from the first main body, at least one of the cross-sections of the first main body and the second main body is provided with an opening, and the first main body and the second main body are connected on both sides of the opening and close the opening.

[0007] The present application also provides a battery pack box, which includes the above-mentioned box beam.

[0008] The present application also provides a battery pack, which includes the above-mentioned battery pack case. Beneficial effects

[0009] The box beam provided in this application, by providing a first main body and a second main body, facilitates streamlined operations and improves box beam production efficiency. Furthermore, it avoids the long manufacturing cycle associated with processing the box beam from a single plate. After processing the first and second main bodies separately, the opening is closed by closing the first and second main bodies together, thereby completing the box beam manufacturing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] FIG1 is a schematic cross-sectional view of a box beam in the related art;

[0011] FIG2 is a partial perspective schematic diagram of a box beam provided in an embodiment of the present application;

[0012] FIG3 is a schematic cross-sectional view of a box beam provided in an embodiment of the present application;

[0013] FIG4 is a schematic cross-sectional view of a first body provided in an embodiment of the present application;

[0014] FIG5 is a schematic cross-sectional view of a second body provided in an embodiment of the present application;

[0015] FIG6 is a top view of a battery pack case provided in an embodiment of the present application;

[0016] FIG7 is a schematic diagram of a partial structure of a battery pack provided in an embodiment of the present application.

[0017] Description of reference numerals:

[0018] 10. First body; 11. First pressure-bearing section; 12. First bending section; 13. Second pressure-bearing section; 14. Second bending section; 15. Third pressure-bearing section; 16. First auxiliary bending section; 17. First connecting section; 100. Box beam; 101. First bending portion; 102. Crossbeam; 103. Longitudinal beam; 104. Reinforcement rib; 131. First sub-pressure-bearing section; 132. Third auxiliary bending section; 133. Second sub-pressure-bearing section; 20. Second body; 21. Fourth pressure-bearing section; 2 2. Third bending section; 23. Fifth pressure-bearing section; 24. Fourth bending section; 25. Sixth pressure-bearing section; 26. Second auxiliary bending section; 27. Second connecting section; 200. Battery pack body; 201. Second bending portion; 251. Through hole; 30. Inner cavity; 300. Battery pack; 301. Hollow chamber; K. Opening; K1. First opening; K2. Second opening; M1. First welding forming part; M2. Second welding forming part; M3. Third welding forming part; N. Accommodating space. Modes for Carrying Out the Invention

[0019] In the description of this application, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and can refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0020] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature includes the first feature being directly above and obliquely above the second feature, with the first feature having a higher horizontal height than the second feature. A first feature being "below," "below," and "below" a second feature includes the first feature being directly below and obliquely below the second feature, with the first feature having a lower horizontal height than the second feature.

[0021] In the description of this embodiment, terms such as "upper," "lower," "left," "right," "front," and "rear" are used to refer to positions or locations based on the positions or locations shown in the accompanying drawings. These terms are intended to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and do not have any special meanings.

[0022] Box beams usually need to be made through special roll-forming molds, but the cost of a roll-forming mold production line is relatively high, usually requiring at least 2 million yuan; in addition, the development cycle of a roll-forming mold production line is relatively long, generally requiring at least three months, which makes it difficult to meet the cycle requirements of rapid development projects.

[0023] In the related art, as shown in Figure 1, a box beam 100' is typically fabricated from a single sheet. Since the sheet needs to be bent multiple times and joined together to form a box beam with closed side openings, using a less expensive bending process would make it difficult for the bending blade of the press brake to insert into the closed box beam for the bending operation, resulting in difficulty in forming the final shape of the box beam 100'. Therefore, the box beam 100' can only be manufactured using a rolling die, which increases the manufacturing cost and extends the manufacturing cycle of the final box beam 100'.

[0024] Based on this, the embodiment of the present disclosure provides a box beam, in which the material of the box beam in this embodiment is, for example, steel. As shown in Figures 2 to 5, the box beam 100 includes a first main body 10 and a second main body 20 that are separately provided.

[0025] An opening K is defined in at least one of the cross sections of the first body 10 and the second body 20 . The first body 10 and the second body 20 are located on both sides of the opening K and close the opening K.

[0026] Because the first and second bodies 10, 20 are provided separately, they can be processed separately. This facilitates streamlined operations and improves the production efficiency of the box beam 100. It also avoids the high manufacturing costs and long manufacturing cycles associated with processing the box beam from a single plate. After the first and second bodies 10, 20 are processed separately, the opening K is closed by closing the first and second bodies 10, thereby completing the manufacturing of the box beam 100.

[0027] In some embodiments, as shown in FIG4 , the first body 10 includes a first bending portion 101 , a cross section of the first bending portion 101 is provided with a first opening K1 , and the first body 10 and the second body 20 are connected on both sides of the first opening K1 and close the first opening K1 .

[0028] In this configuration, the box beam 100 can be formed by connecting the first body 10 with the second body 20 and closing the first opening K1 , thereby completing the manufacture of the box beam 100 .

[0029] In some embodiments, as shown in FIG5 , the second body 20 includes a second bending portion 201 , a second opening K2 is defined in a cross section of the second bending portion 201 , and the first body 10 and the second body 20 are connected on both sides of the second opening K2 and close the second opening K2 .

[0030] In this configuration, the box beam 100 can be formed by connecting the first body 10 to the second body 20 and closing the second opening K2, thereby completing the manufacture of the box beam 100.

[0031] In some embodiments, the first body 10 has a first bending portion 101 , and the second body 20 has a second bending portion 201 . After the first body 10 and the second body 20 are connected, the first opening K1 and the second opening K2 can be closed simultaneously.

[0032] In some embodiments, as shown in Figure 3, the first body 10 and the second body 20 together form an inner cavity 30, the third pressure-bearing section 15 is located in the inner cavity 30 and divides the inner cavity 30 into two hollow chambers 301, and the third pressure-bearing section 15 is provided in one of the first body 10 and the second body 20 and connected to the other.

[0033] For example, the third pressure-bearing section 15 can be provided on the first body 10 and connected to the second body 20. It should be noted that the third pressure-bearing section 15 can be directly connected to the second body 20 or indirectly connected to the second body 20. When the third pressure-bearing section 15 is indirectly connected to the second body 20, it can be connected to the second body 20 through other connected components (such as the first connecting section 17 shown in the figure).

[0034] In this embodiment, the third pressure-bearing section 15 located within the inner cavity can provide greater support strength for the box beam 100, thereby improving the support stability of the box beam 100. In addition, the use of the third pressure-bearing section 15 to separate the two hollow chambers 301 helps reduce the manufacturing cost of the box beam 100, improves the structural strength, and also contributes to the lightweight design of the box beam 100, reducing the weight of the box beam 100.

[0035] In some embodiments, as shown in Figures 2 and 3, the first body 10 includes a first pressure-bearing section 11, a first bending section 12, a second pressure-bearing section 13, a second bending section 14 and a third pressure-bearing section 15 connected in sequence, wherein the first pressure-bearing section 11 and the third pressure-bearing section 15 are arranged opposite to each other.

[0036] Illustratively, the first pressure-bearing section 11, the first bending section 12, the second pressure-bearing section 13, the second bending section 14 and the third pressure-bearing section 15 can collectively serve as the first bending portion 101 described in some of the above embodiments, and the free end of the first pressure-bearing section 11 (i.e., the end of the first pressure-bearing section 11 away from the first bending section 12) and the free end of the third pressure-bearing section 15 (i.e., the end of the third pressure-bearing section 15 away from the second bending section 14) can jointly define the above-mentioned first opening K1.

[0037] The second body 20 includes a fourth pressure-bearing section 21 , a third bending section 22 , a fifth pressure-bearing section 23 , a fourth bending section 24 and a sixth pressure-bearing section 25 which are connected in sequence.

[0038] Illustratively, the fourth pressure-bearing section 21, the third bending section 22, the fifth pressure-bearing section 23, the fourth bending section 24 and the sixth pressure-bearing section 25 can collectively serve as the second bending portion 201 described in some of the above embodiments, and the free end of the fourth pressure-bearing section 21 (i.e., the end of the fourth pressure-bearing section 21 away from the third bending section 22) and the free end of the sixth pressure-bearing section 25 (i.e., the end of the sixth pressure-bearing section 25 away from the fourth bending section 24) can jointly define the above-mentioned second opening K2.

[0039] The fourth pressure-bearing section 21 is disposed opposite the sixth pressure-bearing section 25, and the fifth pressure-bearing section 23 is disposed opposite the third pressure-bearing section 15, with the third pressure-bearing section 15 located between the first pressure-bearing section 11 and the fifth pressure-bearing section 23. The fourth pressure-bearing section 21 is connected to the second pressure-bearing section 13, and the third pressure-bearing section 15 and the first pressure-bearing section 11 are respectively connected to the sixth pressure-bearing section 25.

[0040] Because the first pressure-bearing section 11 and the third pressure-bearing section 15 are disposed relative to each other, the third pressure-bearing section 15 and the first pressure-bearing section 11 are connected to different locations of the sixth pressure-bearing section 25. For example, the first pressure-bearing section 11 is connected to the end of the sixth pressure-bearing section 25 away from the fourth bend section 24, while the third pressure-bearing section 15 is connected to the middle of the sixth pressure-bearing section 25.

[0041] In this way, after connecting the above-mentioned pressure-bearing sections, the fixation between the first main body 10 and the second main body 20 can be completed. After the first main body 10 and the second main body 20 are fixed, the longitudinal section of the box girder 100 is roughly in the shape of a Chinese character 'Ri', where the longitudinal section direction of the box girder 100 is perpendicular to the length direction of the box girder 100. Since the box girder 100 has a cross-section in the shape of a Chinese character 'Ri', the pressure-bearing section in the middle of its interior (i.e., the third pressure-bearing section 15) can provide greater support strength, thereby improving the support strength and support stability of the box girder 100; and, two hollow chambers 301 are separated above and below the third pressure-bearing section 15, which is beneficial to reducing the manufacturing cost of the box girder 100, improving the structural strength, and at the same time contributing to the lightweight design of the box girder 100 and reducing the weight of the box girder 100.

[0042] For the above-mentioned box girder 100, since both the first main body 10 and the second main body 20 only have two bending sections, that is, both the first main body 10 and the second main body 20 only need to be bent twice. During this process, both the first main body 10 and the second main body 20 always have an open frame structure, and the folding knife of the folding machine can also extend into the inner cavity formed after the box girder is bent, so as to ensure the smooth progress of the bending process for the first main body 10 and the second main body 20.

[0043] After the first main body 10 and the second main body 20 are fabricated through the bending process, by connecting the relevant pressure-bearing sections, the fixation between the first main body 10 and the second main body 20 can be achieved, thereby completing the fabrication of the box girder 100. With such a design, the box girder 100 can be processed and fabricated through a bending process with a lower cost and a wider application range, which is beneficial to reducing its manufacturing cost and ensuring that the box girder 100 has a high manufacturing efficiency; it can also effectively shorten the manufacturing cycle of the box girder 100.

[0044] In addition, the support strength of the box girder 明]].

[0045] In some examples, as shown in FIG. 3, the connection between the fourth pressure-bearing section 21 and the second pressure-bearing section 13 may have a first welded forming part M1, that is, the fourth pressure-bearing section 21 and the second pressure-bearing section 13 are connected by welding. The first welded forming part has materials that are melted due to high temperature and then cooled. By using welding, the connection stability between the fourth pressure-bearing section 21 and the second pressure-bearing section 13 can be effectively ensured.

[0046] In some examples, the third pressure-bearing section 15 and the sixth pressure-bearing section 25 may be connected by welding.

[0047] In some examples, the first pressure-bearing segment 11 and the sixth pressure-bearing segment 25 may be connected by welding.

[0048] In some embodiments, please continue to refer to Figures 2 and 3. The first main body 10 also includes a first auxiliary bending section 16 and a first connecting section 17 located at one end of the third pressure-bearing section 15 away from the second pressure-bearing section 13 and connected in sequence. The first connecting section 17 is parallel to the sixth pressure-bearing section 25 and is connected to each other.

[0049] In this way, the first auxiliary bending section 16 can make the first connecting section 17 parallel to the sixth pressure-bearing section 25, thereby facilitating the connection between the two. In addition, a larger contact surface can be provided between the first connecting section 17 and the sixth pressure-bearing section 25, thereby further ensuring the connection stability between the two.

[0050] In some examples, as shown in FIG3 , the connection between the first connecting segment 17 and the sixth pressure-bearing segment 25 includes a second welded portion M2. This means that the first connecting segment 17 and the sixth pressure-bearing segment 25 can be connected by welding. The second welded portion M2 is made of a material that melts at high temperatures and then cools. This helps ensure a stable connection between the first connecting segment 17 and the sixth pressure-bearing segment 25. Furthermore, this connection method is relatively cost-effective, which helps reduce the manufacturing cost of the box beam 100.

[0051] For example, as shown in Figure 2, the first connecting section 17 is in contact with the sixth pressure-bearing section 25, and a through hole 251 is provided on the sixth pressure-bearing section 25. The first connecting section 17 closes the through hole 251, so that there are more interfaces between the first connecting section 17 and the sixth pressure-bearing section 25, which is conducive to welding the first connecting section 17 and the sixth pressure-bearing section 25.

[0052] For example, molten solder may be injected into the through hole 251 , and after the solder solidifies, a good connection may be formed between the first connecting section 17 and the sixth pressure-bearing section 25 .

[0053] For another example, a welding tool can be inserted to melt part of the sixth pressure-bearing section 25 so that the melted part contacts the first connecting section 17. After the molten material solidifies, a good connection can be formed between the first connecting section 17 and the sixth pressure-bearing section 25.

[0054] Illustratively, a plurality of through holes 251 may be provided, and the plurality of through holes 251 are evenly distributed along the length direction X of the first connecting section 17 .

[0055] In some embodiments, please continue to refer to Figures 2 and 3. The second main body 20 also includes a second auxiliary bending section 26 and a second connecting section 27 located at the end of the sixth pressure-bearing section 25 away from the fifth pressure-bearing section 23 and connected in sequence. The second connecting section 27 is parallel to the first pressure-bearing section 11 and is connected to each other.

[0056] In this way, the second connecting section 27 can be made parallel to the first pressure section 11 by the second auxiliary bending section 26, thereby facilitating the connection between the two. In addition, the second connecting section 27 and the first pressure section 11 can also have a larger contact surface, thereby further ensuring the connection stability between the two.

[0057] For example, as shown in Figure 3, the connection between the second connecting section 27 and the first pressure-bearing section 11 includes a third welded portion M3. This means that the second connecting section 27 and the first pressure-bearing section 11 can be connected by welding. The third welded portion M3 is made of a material that melts at high temperatures and then cools. This arrangement helps ensure a stable connection between the second connecting section 27 and the first pressure-bearing section 11. Furthermore, this connection method is relatively cost-effective, which helps reduce the manufacturing cost of the box beam 100.

[0058] 2 and 3 , in some embodiments, the second connecting section 27 is located between the first pressure-bearing section 11 and the third pressure-bearing section 15 . In other words, the second connecting section 27 is located below the first pressure-bearing section 11 .

[0059] Because the second connecting section 27 serves only to connect the first pressure-bearing section 11 and to establish a connection between the first pressure-bearing section 11 and the sixth pressure-bearing section 25, the second connecting section 27 can be relatively narrow (the width of the second connecting section 27 is perpendicular to both its thickness and length). The first pressure-bearing section 11, on the other hand, has a relatively wide width and can be used to withstand pressure from or connect to upper components. Positioning the first pressure-bearing section 11 above the second connecting section 27 helps ensure a stable connection between the first pressure-bearing section 11 and the upper components, and evenly distributes the forces exerted by the upper components on the first pressure-bearing section 11 over a larger connection surface, thereby ensuring the support performance of the box beam 100.

[0060] In some examples, the first pressure-bearing section 11 , the third pressure-bearing section 15 , and the fifth pressure-bearing section 23 may be parallel to each other, which is beneficial to improving the overall aesthetics while ensuring the supporting performance of the box beam 100 .

[0061] In some examples, the second pressure-bearing section 13 , the fourth pressure-bearing section 21 , and the sixth pressure-bearing section 25 may be parallel to each other, which is beneficial to improving the overall aesthetics while ensuring the supporting performance of the box beam 100 .

[0062] In some embodiments, the second pressure-bearing section 13 includes a first sub-pressure-bearing section 131, a third auxiliary bending section 132 and a second sub-pressure-bearing section 133 connected in sequence, the second sub-pressure-bearing section 133 is connected to the side of the fourth pressure-bearing section 21 close to the sixth pressure-bearing section 25, and the first sub-pressure-bearing section 131 and the fourth pressure-bearing section 21 are located on the same plane.

[0063] Through the bending action of the third auxiliary bending section 132, the second sub-pressure section 133 and the first sub-pressure section 131 can be located in different planes. After the second sub-pressure section 133 is connected to the fourth pressure section 21, the first sub-pressure section 131 and the fourth pressure section 21 can be located in the same plane.

[0064] Through the above arrangement, on the one hand, the fourth pressure-bearing section 21 can be made flush with the first sub-pressure-bearing section 131, thereby improving the overall aesthetics; on the other hand, the fourth pressure-bearing section 21 can provide greater downward pressure support to the second pressure-bearing section 13, thereby improving the supporting performance of the box beam 100.

[0065] For the first main body 10 in the above-mentioned box beam 100, it can be bent by a steel plate using a bending process to form the above-mentioned first pressure-bearing section 11, first bending section 12, second pressure-bearing section 13, second bending section 14, third pressure-bearing section 15, first auxiliary bending section 16 and first connecting section 17, that is, the first main body 10 is an integrated structure and can be manufactured through a bending process.

[0066] For example, the steel plate may be a high-strength steel plate such as 780DP.

[0067] Illustratively, the thickness of the steel plate may be greater than or equal to 1 mm and less than or equal to 2 mm.

[0068] Similarly, for the second main body 20 in the above-mentioned box beam 100, it can be bent by using a bending process on another steel plate to form the above-mentioned fourth pressure-bearing section 21, the third bending section 22, the fifth pressure-bearing section 23, the fourth bending section 24, the sixth pressure-bearing section 25, the second auxiliary bending section 26 and the second connecting section 27, that is, the second main body 20 is an integrated structure and can be manufactured by a bending process.

[0069] The material and thickness of the second body 20 may be set with reference to the material and thickness of the first body 10 , and will not be further described here.

[0070] The box beam 100 can be quickly prototyped and then quickly verified. If deficiencies are found after verification, they can be quickly and flexibly optimized and then re-verified. The production of the box beam 100 mainly involves a bending process and can be adapted to various bending machines, which reduces the need for mold modification and other issues, thereby effectively saving the cost of mold modification or replacement.

[0071] Some embodiments of the present disclosure further provide a battery pack case, as shown in FIG6 , wherein the battery pack case 200 includes the box beam 100 as described in any of the above embodiments.

[0072] Since the battery pack box body 200 includes the above-mentioned box beam 100, it has all the technical effects possessed by the box beam 100, which will not be described in detail here.

[0073] In some embodiments, in the battery pack box 200 , a plurality of box beams 100 are provided, and the plurality of box beams 100 are sequentially connected and enclosed to form an accommodating space N, which is used to accommodate battery cells.

[0074] Because multiple box beams 100 enclose the accommodating space N, they serve as the primary support for the battery pack housing 200, providing excellent support performance and ensuring high strength for the battery pack housing 200. Furthermore, the box beams 100 can be quickly prototyped and validated. If deficiencies are discovered after validation, they can be quickly and flexibly optimized and subsequently validated. This reduces mold modification and other issues associated with manufacturing the box beams 100, saving mold costs. This is highly adaptable to battery pack projects with smaller order volumes or those requiring rapid early development.

[0075] Exemplarily, there are four box beams 100, two of which are parallel to each other and serve as cross beams 102, and the other two box beams 100 are parallel to each other and serve as longitudinal beams 103. The two ends of the longitudinal beams 103 are respectively connected to the two cross beams 102, so that the four box beams 100 ultimately define a rectangular accommodating space N.

[0076] In some embodiments, the battery pack box 200 further includes a plurality of cross-arranged reinforcing ribs 104, with both ends of the reinforcing ribs connected to corresponding box beams 100. By providing the reinforcing ribs 104, the supporting strength of the battery pack box 200 can be further improved.

[0077] In some examples, two reinforcing ribs 104 may be provided, wherein one reinforcing rib 104 includes two sub-reinforcing ribs, each of which is connected to two sides of the other reinforcing rib 104 and is located on the same straight line. This allows for the fixation of multiple reinforcing ribs 104 .

[0078] In some examples, the reinforcement rib 104 (or sub-reinforcement rib) may be the box beam 100 described above.

[0079] Some embodiments of the present disclosure further provide a battery pack, as shown in FIG7 , wherein the battery pack 300 includes the battery pack case 200 described in any of the above embodiments.

[0080] Since the battery pack box 200 has the box beam 100 and the battery pack 300 has the battery pack box 200 , the battery pack 300 has all the technical effects possessed by the box beam 100 , which will not be described in detail here.

Claims

1. A box beam comprising: First subject (10); The second body (20) is separately provided from the first body (10), and at least one of the cross sections of the first body (10) and the second body (20) is provided with an opening (K), and the first body (10) and the second body (20) are connected on both sides of the opening (K) and close the opening (K).

2. The box beam according to claim 1, wherein: The first body (10) comprises a first bent portion (101), a cross section of the first bent portion (101) is provided with a first opening (K1), the first body (10) and the second body (20) are connected on both sides of the first opening (K1) and close the first opening (K1); and / or, The second body (20) comprises a second bent portion (201), a cross section of the second bent portion (201) is provided with a second opening (K2), and the first body (10) and the second body (20) are connected on both sides of the second opening (K2) and close the second opening (K2).

3. The box beam according to claim 1, wherein: The first main body (10) and the second main body (20) together form an inner cavity (30), the third pressure-bearing section (15) is located in the inner cavity (30) and divides the inner cavity (30) into two hollow chambers (301), and the third pressure-bearing section (15) is provided on one of the first main body (10) and the second main body (20) and connected to the other.

4. The box beam according to any one of claims 1 to 3, wherein: The first main body (10) comprises a first pressure-bearing section (11), a first bending section (12), a second pressure-bearing section (13), a second bending section (14) and a third pressure-bearing section (15) connected in sequence; the first pressure-bearing section (11) and the third pressure-bearing section (15) are arranged opposite to each other; the second main body (20) comprises a fourth pressure-bearing section (21), a third bending section (22), a fifth pressure-bearing section (23), a fourth bending section (24) and a sixth pressure-bearing section (25) connected in sequence; the fourth pressure-bearing section (24) and the sixth pressure-bearing section (25) are arranged opposite to each other; The fifth pressure-bearing section (23) and the third pressure-bearing section (15) are arranged opposite to each other, the fourth pressure-bearing section (24) is connected to the second pressure-bearing section (13), and the third pressure-bearing section (15) and the first pressure-bearing section (11) are respectively connected to the sixth pressure-bearing section (25).

5. The box beam according to claim 4, wherein: The first main body (10) further comprises a first auxiliary bending section (16) and a first connecting section (17) located at one end of the third pressure-bearing section (15) away from the second pressure-bearing section (13) and connected in sequence, wherein the first connecting section (17) is parallel to and connected to the sixth pressure-bearing section (25).

6. The box beam according to claim 5, wherein: The first connecting section (17) contacts the sixth pressure-bearing section (25); a through hole (251) is provided on the sixth pressure-bearing section (25); and the first connecting section (17) closes the through hole (251).

7. The box beam according to claim 5, wherein: The connection between the first connecting section (17) and the sixth pressure-bearing section (25) has a second welding portion (M2).

8. The box beam according to claim 4, wherein: The second main body (20) further comprises a second auxiliary bending section (26) and a second connecting section (27) located at an end of the sixth pressure-bearing section (25) away from the fifth pressure-bearing section (23) and connected in sequence, wherein the second connecting section (27) is parallel to the first pressure-bearing section (11) and connected to each other.

9. The box beam according to claim 8, wherein: The second connecting section (27) is located between the first pressure-bearing section (11) and the third pressure-bearing section (15).

10. The box beam according to claim 8, wherein: The connection between the second connecting section (27) and the first pressure-bearing section (11) has a third welding portion (M3).

11. The box beam according to claim 4, wherein: The second pressure-bearing section (13) comprises a first sub-pressure-bearing section (131), a third auxiliary bending section (132), and a second sub-pressure-bearing section (133) connected in sequence, the second sub-pressure-bearing section (133) being connected to a side of the fourth pressure-bearing section (21) close to the sixth pressure-bearing section (25), and the first sub-pressure-bearing section (131) and the fourth pressure-bearing section (21) being located on the same plane.

12. The box beam according to claim 4, wherein: The connection between the fourth pressure-bearing section (24) and the second pressure-bearing section (13) comprises a first welding portion (M1).

13. The box beam according to claim 4, wherein: The first pressure-bearing section (11), the third pressure-bearing section (15), and the fifth pressure-bearing section (23) are parallel to each other.

14. The box beam according to claim 4, wherein: The second pressure-bearing section (13), the fourth pressure-bearing section (21), and the sixth pressure-bearing section (25) are parallel to each other.

15. A battery pack box, comprising the box beam (100) according to any one of claims 1 to 14.

16. The battery pack case according to claim 15, wherein: A plurality of box beams (100) are provided, and the plurality of box beams (100) are sequentially connected and enclosed to form an accommodating space (N), and the accommodating space (N) is used to accommodate battery cells.

17. The battery pack case according to claim 16, wherein: It also includes a plurality of cross-arranged reinforcing ribs (104), with both ends of the reinforcing ribs (104) respectively connected to corresponding box beams (100).

18. A battery pack, comprising the battery pack case (200) according to any one of claims 15 to 17.

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