Battery pack longitudinal beam and battery pack

Abstract

The utility model provides a battery pack longitudinal beam and a battery pack, the battery pack longitudinal beam comprises an inverted T-shaped beam body, and the beam body comprises a transverse part and a longitudinal part; the two top supporting plates are respectively arranged at the tops of the transverse parts on the left side and the right side of the longitudinal part; the bottom supporting plate is arranged at the bottom of the transverse part; the supporting columns are arranged on the left side and the right side of the longitudinal part respectively, and the supporting columns are arranged in the length direction of the beam body at intervals; the supporting columns penetrate through the transverse part and are connected between the top supporting plate and the bottom supporting plate. According to the battery pack longitudinal beam disclosed by the utility model, due to the arrangement of the inverted T-shaped beam body, the top supporting plate, the bottom supporting plate and the supporting columns, the structural strength of the battery pack longitudinal beam can be improved, and the bearing capacity of the battery pack longitudinal beam in the vertical direction can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, and particularly relates to a battery pack longitudinal beam. The utility model also relates to a battery pack provided with the above battery pack longitudinal beam. Background Technique

[0002] With the rapid development of the electric vehicle industry, the battery pack, as the core component of the electric vehicle, its performance and safety have been increasingly emphasized. The battery pack is provided with battery modules and other components. With the increase of the battery capacity of the battery pack, the number and weight of the battery modules also increase, which puts forward higher requirements for the structural strength and load-bearing capacity of the battery pack.

[0003] At present, in order to improve the structural strength and load-bearing capacity of the battery pack, the battery pack is usually provided with a battery pack longitudinal beam. The battery pack longitudinal beam can reinforce the shell structure of the battery pack, and at the same time, the battery pack longitudinal beam itself can carry the battery module to ensure the normal operation of the battery pack. However, the existing battery pack longitudinal beam still has the problems of insufficient structural strength and limited load-bearing capacity, resulting in the battery pack longitudinal beam being prone to serious deformation or even fracture due to excessive stress. Content of the Utility Model

[0004] In view of this, the utility model aims to provide a battery pack longitudinal beam to improve the structural strength and load-bearing capacity of the battery pack longitudinal beam.

[0005] To achieve the above object, the technical solution of the utility model is realized as follows:

[0006] A battery pack longitudinal beam, comprising:

[0007] A beam body in an inverted T shape, the beam body comprising a transverse part and a longitudinal part;

[0008] Two top support plates, respectively arranged at the top of the transverse part on the left and right sides of the longitudinal part;

[0009] A bottom support plate, arranged at the bottom of the transverse part;

[0010] A plurality of support columns, each support column is respectively arranged on the left and right sides of the longitudinal part, and each support column is arranged at intervals along the length direction of the beam body; each support column penetrates through the transverse part and is connected between the top support plate and the bottom support plate.

[0011] Further, each of the top support plates is formed with a first protrusion, and the first protrusion can be embedded into a first groove at the top of the transverse part; and / or, the bottom support plate is formed with a second protrusion, and the second protrusion can be embedded into a second groove at the bottom of the transverse part.

[0012] Further, the transverse portion includes a bottom wall, two first bending walls formed by folding upward from the left and right ends of the bottom, and two second bending walls formed by horizontally bending each of the first bending walls; the two second bending walls are arranged parallel to the bottom wall, and the ends of the two second bending walls are connected to the longitudinal portion.

[0013] Further, the bottom wall is formed with a recessed portion formed due to the meandering bending of the bottom wall; the recessed portion is configured to form a middle recessed portion at the bottom of the longitudinal portion, and two side recessed portions respectively formed on both sides of the middle recessed portion.

[0014] Further, each of the recessed portions includes a fitting portion, and connecting portions connected to both ends of the fitting portion; the fitting portion of each side recessed portion is fitted to each of the second bending walls, and the fitting portion of the middle recessed portion is fitted to both of the second bending walls.

[0015] Further, each of the support columns is located in each of the side recessed portions; a reduced-diameter section is formed at the top end of the support column, and the reduced-diameter section can penetrate through the fitting portion and the second bending wall and be connected to the top support plate, and the fitting portion is lapped on the top end of the support column.

[0016] Further, the longitudinal portion includes a first side wall and a second side wall arranged oppositely; the bottom end of the first side wall is connected to one of the second bending walls, and the bottom end of the second side wall is connected to the other second bending wall; the second side wall includes a first wall body connected to the top of the first side wall through a top wall, and a second wall body connected to the corresponding second bending wall.

[0017] Further, a bent arm is respectively connected to the free end of the first wall body and the free end of the second wall body within the longitudinal portion; the two bent arms extend horizontally, and the end of each bent arm is connected to the first side wall, so that the longitudinal portion forms a structure in the shape of a Chinese character 'Ri'.

[0018] Further, a flanging is formed on each of the bent arms, and each bent arm is connected to the first wall body through the flanging.

[0019] Compared with the prior art, the present utility model has the following advantages:

[0020] For the battery pack longitudinal beam of the present utility model, through the setting of the inverted T-shaped beam body, it has good anti-bending and anti-torsion properties, improves the structural strength of the battery pack longitudinal beam, and through the setting of the top support plate, the bottom support plate and the support columns, it can also play an additional supporting effect to improve the bearing capacity of the battery pack longitudinal beam in the vertical direction.

[0021] The first protrusion on the top support plate, the second protrusion on the bottom support plate, and the settings of the first groove and the second groove on the transverse part improve the connection stability between the top support plate and the bottom support plate and the transverse part.

[0022] The settings of the bottom wall, the first bending wall, and the second bending wall of the transverse part enable the transverse part to form a relatively stable rectangular structure, which can improve the structural strength of the transverse part, thereby improving the load-bearing capacity of the beam body.

[0023] By making the bottom wall bend circuitously to form a recessed part, the bent structure of the recessed part can improve the anti-bending performance of the transverse part.

[0024] Through the settings of the middle recessed part and the two side recesses, each recessed part can provide vertical support for the transverse part, thereby improving the structural strength of the transverse part and its load-bearing capacity.

[0025] Through the setting of the reduced-diameter section on the support column, while the support column supports components such as battery modules in the battery pack, it can also provide a vertical support effect for the fitting part, that is, the transverse part, to prevent the transverse part from being crushed due to excessive weight it bears, thereby improving the structural strength and load-bearing capacity of the beam body.

[0026] The settings of the first side wall, the second side wall, and the top wall of the longitudinal part enable the longitudinal part to form a relatively stable rectangular structure, which can improve the bending and torsional resistance performance of the beam body and enhance the structural strength of the beam body.

[0027] Through the setting of the "day" - shaped structure of the longitudinal part, the anti-bending performance of the longitudinal part in the transverse and longitudinal directions can be further improved, the structural strength of the longitudinal part can be enhanced, so as to improve the overall structural strength of the beam body.

[0028] The setting of the flanging increases the connection area between each bending arm and the first side wall, thereby improving the connection strength and further enhancing the stability of the "day" - shaped structure of the longitudinal part to ensure the structural strength of the beam body.

[0029] Another object of the present utility model is to provide a battery pack, and the battery pack is provided with the battery pack longitudinal beam as described above.

[0030] The battery pack and / or the battery pack longitudinal beam of the present utility model have the same technical effects as those of the prior art, which will not be elaborated herein. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The drawings forming a part of the present utility model are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0032] Figure 1Schematic diagram of the overall structure of the battery pack longitudinal beam according to Embodiment 1 of the present utility model;

[0033] Figure 2 Exploded view of the battery pack longitudinal beam according to Embodiment 1 of the present utility model;

[0034] Figure 3 Front view of the beam body according to Embodiment 1 of the present utility model;

[0035] Figure 4 Of the present utility model Figure 1 Cross-sectional view at the position shown by A-A in;

[0036] Figure 5 Of the present utility model Figure 4 Enlarged view at the position shown by a in;

[0037] Figure 6 Of the present utility model Figure 4 Enlarged view at the position shown by b in;

[0038] Explanation of reference numerals:

[0039] 1. Transverse part;

[0040] 101. Bottom wall; 102. First bending wall; 103. Second bending wall;

[0041] 104. Depression; 104a. Intermediate depression; 104b. Side depression;

[0042] 1041. Fitting part; 1042. Connecting part;

[0043] 2. Longitudinal part;

[0044] 201. First side wall; 202. Second side wall; 203. Top wall; 204. Bending arm; 205. Flange;

[0045] 2021. First wall body; 2022. Second wall body;

[0046] 3. Top support plate; 301. First protrusion; 302. First groove;

[0047] 4. Bottom support plate; 401. Second protrusion; 402. Second groove;

[0048] 5. Support column; 501. Reduced diameter section. Detailed implementation manners

[0049] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other.

[0050] In the following description, specific details such as specific system architectures and technologies are presented for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present application. However, those skilled in the art should clearly understand that the present application can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details from interfering with the description of the present application.

[0051] In the description of the present utility model, it should be noted that if terms indicating orientation or positional relationships such as "upper", "lower", "inner", "outer", etc. appear, they are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present utility model. In addition, if terms such as "first" and "second" appear, they are also only for descriptive purposes and should not be construed as indicating or implying relative importance.

[0052] In addition, in the description of the present utility model, unless otherwise clearly defined, the terms "installation", "connection", "connection", and "connector" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood in combination with specific situations.

[0053] The present utility model will be described in detail below with reference to the drawings and in conjunction with embodiments.

[0054] Embodiment 1

[0055] This embodiment relates to a battery pack longitudinal beam. In terms of the overall structure, as Figure 1 、 Figure 2 and Figure 3 shown, the battery pack longitudinal beam of this embodiment includes: a beam body, a top support plate 3, a bottom support plate 4, and a support column 5.

[0056] Among them, the beam body of this embodiment is in an inverted T shape, and the beam body includes a transverse part 1 and a longitudinal part 2. The top support plates 3 are configured to be two respectively arranged on the tops of the transverse parts 1 on the left and right sides of the longitudinal part 2. The bottom support plate 4 is arranged at the bottom of the transverse part 1. A plurality of support columns 5 are provided between the top support plate 3 and the bottom support plate 4. Each support column 5 is arranged on the left and right sides of the longitudinal part 2, and at the same time, each support column 5 is arranged at intervals along the length direction of the beam body, and penetrates through the transverse part 1 and is connected to the top support plate 3 and the bottom support plate 4. Therefore, in addition to the transverse part 1 being able to support components such as battery modules in the battery pack, the support columns 5 can also support the components in the battery pack.

[0057] As described above, through the setting of the inverted T-shaped beam body, it has good anti-bending and anti-torsion performance, improves the structural strength of the longitudinal beam of the battery pack, and through the setting of the top support plate 3, the bottom support plate 4 and the support columns 5, it can also play an additional supporting effect to improve the bearing capacity of the longitudinal beam of the battery pack in the vertical direction.

[0058] Specifically based on the above overall introduction, as Figure 1 、 Figure 3 and Figure 4 shown, the beam body of this embodiment can be bent and roll-pressed from a single sheet of plate, which can facilitate the processing and forming of the beam body while ensuring the structural strength of the beam body.

[0059] In addition, the thickness D of the plate material constituting the beam body satisfies: 1.2 mm ≤ D ≤ 1.5 mm, so as to reduce the manufacturing and processing cost of the beam body to a certain extent and reduce the overall weight of the longitudinal beam of the battery pack while ensuring that the beam body of this embodiment has sufficient structural strength. In specific implementation, the thickness D can be 1.2 mm, 1.3 mm, 1.4 mm or 1.5 mm to ensure the structural strength and reduce the weight and cost of the beam body.

[0060] Since the beam body is arranged inside the battery pack and the length of the beam body is relatively long, in order to improve the anti-bending performance of the beam body and reduce the bending of the beam body when the beam body bears the battery modules and other components in the battery pack, the distance H between the top of the longitudinal part 2 and the bottom of the transverse part 1 of this embodiment, that is, the distance between the top and the bottom wall 101 described below, and the length L of the beam body satisfy: H = (0.04 - 0.06) * L. So that the height of the beam body, that is, the height of the longitudinal part 2 and the length of the beam body have a suitable proportional relationship. It can be understood that in the inverted T-shaped beam body, the longitudinal part 2 can support the transverse part 1. When the length L of the beam body is larger, the distance H is larger, so that the height of the longitudinal part 2 is larger, which can improve the supporting effect on the transverse part 1, thereby improving the anti-bending performance of the beam body of this embodiment. In specific implementation, the length L and the distance H of this embodiment should be determined according to the length and height of the internal space of the battery pack where the beam body is located.

[0061] In addition, the transverse portion 1 of the beam body is used to carry the battery modules and other components in the battery pack. To improve the load-bearing capacity of the transverse portion 1, the width A of the transverse portion 1 in this embodiment satisfies: A = (2 - 3) * H, so as to ensure that the transverse portion 1 has sufficient support area to support the battery modules or other components. And in this embodiment, the thickness B of the transverse portion 1, that is, the distance between the second bending wall 103 and the bottom wall 101 described below, satisfies: B ≥ 0.15 * H, so that the transverse portion 1 has sufficient thickness, thereby improving the structural strength of the transverse portion 1 and preventing the transverse portion 1 from bending when it plays a supporting role, and further improving the structural strength and load-bearing capacity of the beam body.

[0062] Furthermore, the thickness D1 of the top support plate 3 in this embodiment is equal to the thickness D2 of the bottom support plate 4. To minimize the weights of the top support plate 3 and the bottom support plate 4 as much as possible, the thicknesses D1 and D2 satisfy: 1.5 mm ≤ D2 ≤ 2 mm. For example, D2 can be selected as 1.5 mm, 1.75 mm, or 2 mm.

[0063] To ensure the connection stability between the top support plate 3 and the bottom support plate 4 and the transverse portion 1, each top support plate 3 in this embodiment is formed with a first protrusion 301, and the first protrusion 301 can be embedded in the first groove 302 at the top of the transverse portion 1. Through the cooperative setting of the first protrusion 301 and the first groove 302, when the top support plate 3 is installed on the top of the transverse portion 1, the slippage between the top support plate 3 and the transverse portion 1 can be prevented. In addition, a second protrusion 401 is formed on the bottom support plate 4, and the second protrusion 401 can be embedded in the second groove 402 at the bottom of the transverse portion 1, and its effect is the same as that of the cooperative setting of the above-mentioned first protrusion 301 and the first groove 302. Thus, the connection stability between the top support plate 3 and the bottom support plate 4 and the transverse portion 1 is improved. In specific implementation, one first protrusion 301 is provided on each top support plate 3 in this embodiment, and second protrusions 401 are respectively provided at the left and right ends of the bottom support plate 4. Of course, the first protrusion 301 and the second protrusion 401, as well as the first groove 302 and the second groove 402 cooperating with them, can also be set to other quantities as long as the connection stability between the top support plate 3 and the bottom support plate 4 and the transverse portion 1 can be improved. In specific implementation, as Figure 4 、 Figure 5 and Figure 6 shown, the first protrusion 301 and the second protrusion 401 are in a semi-circular protrusion structure, and the radius R of the protrusion structure satisfies: 0.2 * D ≤ R ≤ 0.25 * D, ensuring the connection stability between each support plate and the transverse portion 1 while not significantly affecting the structural strength of each support plate and the beam body.

[0064] In this embodiment, the transverse part 1 includes a bottom wall 101, two first bent walls 102 formed by folding up from the left and right ends of the bottom, and two second bent walls 103 formed by horizontally bending each first bent wall 102. Among them, the two second bent walls 103 are arranged parallel to the bottom wall 101, and the ends of the two second bent walls 103 are connected to the longitudinal part 2. With this setting, the transverse part 1 forms a relatively stable rectangular structure, which can improve the structural strength of the transverse part 1, thereby improving the bearing capacity of the beam body.

[0065] In order to further improve the structural strength of the transverse part 1, a recessed part 104 is formed on the bottom wall 101 of this embodiment due to the circuitous bending of the bottom wall 101. The recessed part 104 is configured to form a middle recessed part 104a at the bottom of the longitudinal part 2, and two side recessed parts 104b respectively formed on both sides of the middle recessed part 104a. By making the bottom wall 101 circuitously bend to form the recessed part 104, the bent structure of the recessed part 104 can improve the anti-bending performance of the transverse part 1, and through the setting of the middle recessed part 104a and the side recessed parts 104b, the middle and both sides of the transverse part 1 can be reinforced, thereby improving the uniformity of structural reinforcement, and thus improving the structural strength of the transverse part 1, that is, the beam body.

[0066] Specifically, each recessed part 104 of this embodiment includes a fitting part 1041, and connecting parts 1042 connected to both ends of the fitting part 1041. The fitting part 1041 of each side recessed part 104b is fitted to each second bent wall 103, and the fitting part 1041 of the middle recessed part 104a is fitted to both second bent walls 103. Through the setting of the fitting part 1041 and the connecting parts 1042, the connecting parts 1042 can support the fitting part 1041, and in the side recessed part 104b, the fitting part 1041 is fitted to the second bent wall 103, so that the side recessed part 104b plays a supporting role for the second bent wall 103, and in the middle recessed part 104a, the fitting part 1041 is fitted to both second bent walls 103 to support both second bent walls 103 and the longitudinal part 2 connecting the second bent walls 103. Thus, each recessed part 104 can provide vertical support for the transverse part 1, thereby improving the structural strength of the transverse part 1 and the bearing capacity of the transverse part 1.

[0067] In specific implementation, such as Figure 4As shown, the included angle θ between the connecting portion 1042 and the bottom wall 101 satisfies: 120° ≤ θ ≤ 150°. For example, θ can be selected as 120°, 130°, 140° or 150°. When the included angle θ is too small, the lateral stability of the recessed portion 104 is insufficient, and when the included angle θ is too large, the supporting ability of the recessed portion 104 in the vertical direction for the lateral portion 1 is weak. Therefore, by setting the included angle θ within a suitable range, the supporting effect of the recessed portion 104 on the lateral portion 1 can be further improved, thereby improving the structural strength of the lateral portion 1.

[0068] To further improve the supporting effect on the lateral portion 1, each support column 5 in this embodiment is located in each side recessed portion 104b. A reduced-diameter section 501 is formed at the top end of the support column 5. The reduced-diameter section 501 can penetrate through the fitting portion 1041 and the second bent wall 103 and be connected to the top support plate 3, and the fitting portion 1041 is lapped on the top end of the support column 5. Through the setting of the reduced-diameter section 501 on the support column 5, while the support column 5 supports components such as battery modules in the battery pack, it can also provide a supporting effect in the vertical direction for the fitting portion 1041, that is, the lateral portion 1, to prevent the lateral portion 1 from being crushed due to the excessive weight it bears, thereby improving the structural strength and load-bearing capacity of the beam body.

[0069] In this embodiment, the longitudinal portion 2 includes a first side wall 201 and a second side wall 202 arranged oppositely. The bottom end of the first side wall 201 is connected to a second bent wall 103, and the bottom end of the second side wall 202 is connected to another second bent wall 103. The second side wall 202 includes a first wall body 2021 connected to the top of the first side wall 201 through a top wall 203, and a second wall body 2022 connected to the corresponding second bent wall 103. This makes the longitudinal portion 2 form a relatively stable rectangular structure, which can improve the bending and torsion resistance of the beam body in this embodiment and improve the structural strength of the beam body.

[0070] To further improve the structural strength of the longitudinal portion 2, bent arms 204 located inside the longitudinal portion 2 are respectively connected to the free ends of the first wall body 2021 and the free end of the second wall body 2022 in this embodiment. The two bent arms 204 extend horizontally, and the end of each bent arm 204 is connected to the first side wall 201, making the longitudinal portion 2 form a structure in the shape of a Chinese character 'Ri'. Through the setting of the structure in the shape of a Chinese character 'Ri' of the longitudinal portion 2, the anti-bending performance of the longitudinal portion 2 in the horizontal and vertical directions can be further improved, and the structural strength of the longitudinal portion 2 can be improved to improve the overall structural strength of the beam body.

[0071] Specifically, flanges 205 are formed on each bending arm 204, and each bending arm 204 is connected to the first wall body 2021 through the flange 205. Through the arrangement of the flange 205, the connection area between each bending arm 204 and the first side wall 201 is increased, thereby improving the connection strength and further enhancing the stability of the longitudinal part in the shape of a Chinese character 'Ri', so as to ensure the structural strength of the beam body. In this embodiment, the connection between the top support plate 3, the bottom support plate 4 and the transverse part 1, the connection between the support column 5 and each support plate, and the connection mode between the flange 205 and the first side wall 201 can all adopt conventional connection methods, such as bonding, welding, etc., as long as the connection strength can be ensured.

[0072] In summary, the battery pack longitudinal beam of this embodiment has good anti-bending and anti-torsion performance through the setting of the inverted T-shaped beam body, improving the structural strength of the battery pack longitudinal beam. And through the setting of the top support plate 3, the bottom support plate 4 and the support column 5, it can also play an additional supporting effect to improve the bearing capacity of the battery pack longitudinal beam in the vertical direction, and has very good practicability.

[0073] Embodiment 2

[0074] This embodiment relates to a battery pack. In terms of the overall structure, a battery pack longitudinal beam as described in Embodiment 1 is provided in this battery pack.

[0075] During specific implementation, this battery pack longitudinal beam is arranged in the internal space of the battery pack and is located on the lower shell of the battery pack, and is used to carry the battery modules or other components in the battery pack.

[0076] The battery pack of this embodiment can improve the bearing capacity of the battery pack through the setting of the above-mentioned battery pack longitudinal beam, thereby improving the use quality of the battery pack.

[0077] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A battery pack longitudinal beam, characterized in that, Comprising: A beam body in an inverted T shape, the beam body including a transverse portion and a longitudinal portion; Two top support plates, respectively arranged on the tops of the transverse portions on the left and right sides of the longitudinal portion; A bottom support plate, arranged at the bottom of the transverse portion; A plurality of support columns, each of the support columns respectively arranged on the left and right sides of the longitudinal portion, and each of the support columns arranged at intervals along the length direction of the beam body; Each of the support columns penetrates through the transverse portion and is connected between the top support plate and the bottom support plate.

2. The longitudinal beam of the battery pack according to claim 1, wherein: Each of the top support plates is formed with a first protrusion, and the first protrusion can be embedded in a first groove on the top of the transverse portion; And / or, a second protrusion is formed on the bottom support plate, and the second protrusion can be embedded in a second groove on the bottom of the transverse portion.

3. The longitudinal beam of the battery pack according to claim 1, wherein: The transverse portion includes a bottom wall, two first bending walls formed by folding up from the left and right ends of the bottom, and two second bending walls formed by horizontally bending each of the first bending walls; The two second bending walls are arranged parallel to the bottom wall, and the ends of the two second bending walls are connected to the longitudinal portion.

4. The longitudinal beam of the battery pack according to claim 3, wherein: The bottom wall is formed with a recessed portion formed due to the tortuous bending of the bottom wall; The recessed portion is configured to form a middle recessed portion at the bottom of the longitudinal portion, and two side recessed portions respectively formed on both sides of the middle recessed portion.

5. The longitudinal beam of the battery pack according to claim 4, wherein: Each of the recessed portions includes a fitting portion, and connecting portions connected to both ends of the fitting portion; The fitting portion of each of the side recessed portions is in contact with each of the second bending walls, and the fitting portion of the middle recessed portion is in contact with both of the second bending walls.

6. The longitudinal beam of the battery pack according to claim 5, wherein: Each of the support columns is located in each of the side recessed portions; A reduced-diameter section is formed at the top end of the support column, and the reduced-diameter section can penetrate through the fitting portion and the second bending wall and be connected to the top support plate, and the fitting portion is lapped on the top end of the support column.

7. The longitudinal beam of the battery pack according to any one of claims 3 to 6, wherein: The longitudinal portion includes a first side wall and a second side wall arranged oppositely; The bottom end of the first side wall is connected to one of the second bending walls, and the bottom end of the second side wall is connected to the other second bending wall; The second side wall includes a first wall body connected to the top of the first side wall through a top wall, and a second wall body connected to the corresponding second bending wall.

8. The longitudinal beam of the battery pack according to claim 7, wherein: Bending arms located inside the longitudinal portion are respectively connected to the free ends of the first wall body and the free ends of the second wall body; The two bending arms extend horizontally, and the end of each bending arm is connected to the first side wall, so that the longitudinal portion forms a structure in the shape of a Chinese character 'Ri'.

9. The longitudinal beam of the battery pack according to claim 8, wherein: Flanges are formed on each of the bent arms, and each of the bent arms is connected to the first wall body through the flange.

10. A battery pack, characterized in that: The battery pack is provided with the battery pack longitudinal beam according to any one of claims 1 to 9.

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