Battery pack frame and battery pack

Abstract

The application relates to the technical field of power batteries, and provides a battery pack frame and a battery pack. The battery pack frame provided by the application comprises a roll-pressed beam, the roll-pressed beam is formed by bending and roll-pressing a single sheet, and a cavity is formed in the inside of the roll-pressed beam. The roll-pressed beam comprises a first beam body and a second beam body, the first beam body and the second beam body each comprise a longitudinal section, two transverse sections respectively arranged at the front and back ends of the longitudinal section, and a transition section connected between the longitudinal section and the transverse section and in a circular arc transition mode. The transverse section of the first beam body is connected with the transverse section of the second beam body, so that the roll-pressed beam forms a frame structure. The battery pack frame provided by the application improves the overall structural strength and rigidity of the frame through the arrangement of the roll-pressed beam and the cavity. The arrangement of the transition section can reduce the stress at the corner of the roll-pressed beam, improve the structural strength of the corner of the beam body, and further improve the protection and support effect on the whole battery pack and the safety performance of the whole battery pack.

Description

Technical Field

[0001] This application relates to the field of power battery technology, and in particular to a battery pack frame and battery pack. Background Technology

[0002] In the field of new energy vehicles, the battery pack typically consists of a frame, a top plate and a bottom plate fastened to the upper and lower sides of the frame, and several battery modules housed within the frame. As the core structure that supports the battery cell components and isolates them from external impacts, the battery pack frame must possess sufficient bending and torsional resistance and structural stability to cope with bumps, vibrations, and side collisions during vehicle operation.

[0003] Currently, batteries, including their frames, are typically welded together from multiple side beams. However, this frame structure has too many welding points, especially at the corners of the frame. This makes it easy for the entire frame structure to be damaged due to weld breakage, resulting in insufficient structural strength of the battery pack frame and affecting the overall safety performance of the battery pack. Utility Model Content

[0004] In view of this, this application aims to propose a battery pack frame to improve the overall installation performance of the battery pack.

[0005] To achieve the above objectives, the technical solution of this application is implemented as follows: A battery pack frame includes a roll-formed beam, which is formed by bending and rolling a single sheet of material, and the internal structure of the roll-formed beam has a cavity. The roller-pressed beam includes a first beam and a second beam. Both the first beam and the second beam include a longitudinal section, two transverse sections located at the front and rear ends of the longitudinal section, and a transition section connecting the longitudinal section and the transverse section with a circular arc transition. The transverse section of the first beam is connected to the transverse section of the second beam, so that the roll-formed beam forms a frame structure.

[0006] Furthermore, the roller beam includes a first sidewall and a second sidewall arranged opposite to each other, and a top wall and a bottom wall connected between the first sidewall and the second sidewall; the cavity is formed by the first sidewall, the second sidewall, the top wall and the bottom wall, and a bending arm is provided in the cavity, which is arranged tortuously between the first sidewall and the second sidewall to divide the cavity into multiple parts that are distributed vertically and horizontally.

[0007] Furthermore, the second sidewall includes a first wall body connecting to the top wall and a second wall body connecting to the bottom wall; the top end of the second wall body extends into the cavity to form the bent arm.

[0008] Furthermore, the bending arm includes a first part, a second part, and a third part arranged sequentially from top to bottom; the first part is connected between the top of the second part and the free end of the second wall, the second part abuts against the first side wall, and the third part is connected between the bottom of the second part and the second wall.

[0009] Furthermore, the free end of the first wall is provided with a first connecting arm welded to the first part; and / or, the free end of the third part is provided with a second connecting arm welded to the second wall, the second connecting arm extending toward the first part.

[0010] Furthermore, it also includes a mounting beam, which is located on the outer side of the second sidewall; the mounting beam overlaps with the projection of the second portion in the width direction of the roll forming beam.

[0011] Furthermore, the connection between the first sidewall and the top wall, and the connection between the first sidewall and the bottom wall, are respectively formed with an outwardly protruding first wing and a second wing.

[0012] Furthermore, inclined walls that slope inward toward the battery pack are formed at the upper and lower ends of the first sidewall; the two inclined walls are respectively connected to the top wall and the bottom wall to form the first convex wing and the second convex wing.

[0013] Compared with related technologies, this application has the following advantages: (1) The battery pack frame described in this application, through the arrangement of the roll-formed beam and cavity, can improve the bending and torsional resistance of the roll-formed beam, thereby enhancing the overall structural strength and stiffness of the frame. Simultaneously, the transition section ensures the integrity of the longitudinal and transverse sections and reduces stress at the corners of the roll-formed beam, thus improving the structural strength of the beam corners. Furthermore, the combined arrangement of the first and second beams facilitates the processing and forming of individual beams and can constitute a frame structure, thereby enhancing the protection and support effect for the entire battery pack.

[0014] (2) By setting the bending arm, the bending arm can be arranged in a meandering manner between the first side wall and the second side wall, thereby forming a support for the first side wall and the second side wall. It can divide a single cavity into multiple parts that are distributed vertically and horizontally, thereby improving the cross-sectional moment of inertia and structural stiffness of the roll-pressed beam, significantly enhancing the beam's resistance to bending and torsion, and preventing the beam from undergoing large deformation when under stress.

[0015] (3) By splitting the second sidewall into the first wall and the second wall, it is easier to form a roll beam by bending and rolling a single sheet of material. At the same time, connecting the free end of the bending arm to the second wall can improve the integrity of the bending arm, facilitate the forming of the bending arm in the cavity, and improve the reinforcing effect of the bending arm on the roll beam.

[0016] (4) Through the coordinated arrangement of the first part, the second part and the third part, the first part and the third part can be supported between the second part and the second side wall, and through the support of the second part and the first side wall, a transverse support structure is formed between the first side wall and the second side wall, which is beneficial for the roller beam to resist the transverse force, thereby improving the bending resistance of the roller beam and thus improving the protection effect on the battery module in the battery pack.

[0017] (5) By gradually reducing the distance between the first part and the third part, the first part and the third part are inclined to the inside of the second part. When the second wall is subjected to external force, the first part and the third part can not only directly bear the force in the transverse direction, but also disperse the force to the first side wall, thereby further improving the structural strength of the roller beam and preventing the roller beam from collapsing.

[0018] (6) By setting the first connecting arm, sufficient contact area is ensured between the first part and the first wall, and the connection strength between the first wall and the first part, i.e., between the first wall and the second wall, is ensured by welding. At the same time, setting the second connecting arm can ensure the connection effect between the third part and the second wall. Furthermore, the second connecting arm extends towards the first part, which can prevent the angle between the second connecting arm and the third part from being too large and breaking under stress, thereby further improving the connection stability between the second connecting arm and the second wall.

[0019] (7) By setting up an installation beam and making the projection of the installation beam and the second part overlap in the width direction, the entire bending arm can form a support for the installation beam, avoiding the installation beam from loosening or deforming due to insufficient support, thereby ensuring the long-term reliability of the connection between the battery pack and the vehicle body and reducing the safety risks caused by the failure of the installation structure.

[0020] (8) By setting the first convex wing and the second convex wing, it is beneficial to increase the structural strength between the first wall and the top and bottom walls, improve the bending and torsional resistance of the roller beam, reduce the overall deformation of the beam, and at the same time, the first convex wing and the second convex wing can increase the contact area and connection effect between the roller beam and the bottom and top plates of the battery pack, thereby improving the structural strength of the entire battery pack.

[0021] (9) By setting the inclined wall, when the first side wall is subjected to lateral force, the force can be transmitted to the top wall and bottom wall through the inclined wall, thereby reducing the stress concentration at the connection position between the first side wall and the top wall and bottom wall, thereby improving the connection reliability between the first side wall and the top wall and bottom wall. At the same time, the inclined wall can form a support for the top wall and bottom wall to avoid the first side wall from being dented and deformed by the force in the height direction.

[0022] Another object of this application is to provide a battery pack having a battery pack frame as described above.

[0023] The battery pack described in this application and / or the battery pack frame described above have the same technical effects as related technologies, and will not be described in detail here. Attached Figure Description

[0024] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the battery pack frame and base plate as described in the embodiments of this application; Figure 2 This is a top view of the battery pack frame and base plate described in the embodiments of this application; Figure 3 for Figure 2 Cross-sectional view at position AA in the middle; Explanation of reference numerals in the attached figures: 1. Roller-formed beam; 1a. First beam body; 1b. Second beam body; 101. Longitudinal section; 102. Lateral section; 103. Transition section; 2. First sidewall; 201. Inclined wall; 3. Second sidewall; 301, First wall; 3011, First connecting arm; 302. Second wall; 4. Top wall; 401. First convex wing; 5. Bottom wall; 501. Second convex wing; 6. Bending the arm; 601. First part; 602. Second part; 603. Third part; 6031. Second connecting arm; 7. Install beam; 701. Reinforcing arm; 8. Base plate; 801. Horizontal beam; 802. Longitudinal beam. Detailed Implementation

[0025] To make the technical solution and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0026] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0027] Furthermore, it should be noted that in the description of this application, if terms such as "upper," "lower," "inner," or "outer" appear, indicating orientation or positional relationship, these are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, if terms such as "first" or "second" appear, they are also used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] Furthermore, in the description of this application, unless otherwise expressly defined, the terms "installation," "connection," "joining," and "connector" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application in light of the specific circumstances.

[0029] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0030] The present application will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, elements, structures, and features in one embodiment may be advantageously incorporated into other embodiments.

[0031] An embodiment of the first aspect of this application provides a battery pack frame.

[0032] In related technologies, a battery pack typically consists of a frame, top and bottom plates fastened to the upper and lower sides of the frame, and several battery modules housed within the frame. The battery pack, including the frame, is usually welded together from multiple side beams. At the corners of the frame, weld fractures can easily lead to the destruction of the entire frame structure, resulting in insufficient structural strength of the battery pack frame and affecting the overall safety performance of the battery pack.

[0033] In view of this, in order to overcome the shortcomings of the related technology, the battery pack frame of this embodiment combines... Figures 1 to 3 As shown, the overall design includes a roll forming beam 1, which is formed by bending and rolling a single sheet of material, and the internal structure of the roll forming beam 1 has a cavity.

[0034] The roll forming beam 1 includes a first beam body 1a and a second beam body 1b. Both the first beam body 1a and the second beam body 1b include a longitudinal section 101, two transverse sections located at the front and rear ends of the longitudinal section 101, and a transition section 103 connecting the longitudinal section 101 and the transverse sections 102 with a circular arc transition. The transverse sections 102 of the first beam body 1a are connected to the transverse sections 102 of the second beam body 1b, so that the roll forming beam 1 forms a frame structure.

[0035] Therefore, by incorporating the roller-pressed beam 1 and the cavity, the bending and torsional resistance of the roller-pressed beam 1 can be improved, thereby enhancing the overall structural strength and rigidity of the frame. Simultaneously, the transition section 103 ensures the integrity of the longitudinal section 101 and the transverse section 102, reduces stress at the corners of the roller-pressed beam 1, and improves the structural strength of the beam's corner sections. Furthermore, the combined arrangement of the first beam 1a and the second beam 1b facilitates the processing and forming of individual beams and enables the construction of a frame structure, thereby enhancing the protection and support of the entire battery pack.

[0036] Based on the above overview, specifically, let's continue to combine... Figure 3 As shown, in some exemplary embodiments, the roller beam 1 includes a first sidewall 2 and a second sidewall 3 arranged opposite to each other, and a top wall 4 and a bottom wall 5 connecting the first sidewall 2 and the second sidewall 3. A cavity is formed by the first sidewall 2, the second sidewall 3, the top wall 4, and the bottom wall 5. A bent arm 6 is provided within the cavity, which is arranged tortuously between the first sidewall 2 and the second sidewall 3 to divide the cavity into multiple portions that are spaced apart vertically.

[0037] By setting the bending arm 6, the bending arm 6 can be arranged to meander between the first side wall 2 and the second side wall 3, thereby forming a support for the first side wall 2 and the second side wall 3. It can divide a single cavity into multiple parts that are distributed vertically and horizontally, thereby improving the cross-sectional moment of inertia and structural stiffness of the roller beam 1, significantly enhancing the beam's resistance to bending and torsion, and preventing the beam from undergoing large deformations when under stress.

[0038] In some exemplary embodiments, the second sidewall 3 includes a first wall 301 connecting to the top wall 4 and a second wall 302 connecting to the bottom wall 5. The top end of the second wall 302 extends into the cavity to form a bent arm 6.

[0039] By splitting the second sidewall 3 into a first wall 301 and a second wall 302, it is possible to process and form a roll forming beam 1 by bending and rolling a single sheet of material. At the same time, the bending arm 6 extends from the top of the second wall 302 into the cavity, so that the bending arm 6 is formed by bending the second wall 302, which can improve the integrity of the bending arm 6 and the second wall 302 and improve the reinforcement effect of the bending arm 6 on the roll forming beam 1.

[0040] In some exemplary embodiments, the bending arm 6 includes a first portion 601, a second portion 602, and a third portion 603 arranged sequentially from top to bottom. The first portion 601 is connected between the top of the second portion 602 and the free end of the second wall 302, the second portion 602 abuts against the first sidewall 2, and the third portion 603 is connected between the bottom of the second portion 602 and the second wall 302.

[0041] With the coordinated arrangement of the first part 601, the second part 602, and the third part 603, the first part 601 and the third part 603 can be supported between the second part 602 and the second side wall 3. Through the support of the second part 602 and the first side wall 2, a transverse support structure is formed between the first side wall 2 and the second side wall 3. This helps the roller beam 1 resist the transverse force, thereby improving the bending resistance of the roller beam 1 and thus improving the protection effect on the battery module inside the battery pack.

[0042] In some exemplary embodiments, the spacing between the first portion 601 and the third portion 603 is gradually reduced from the second portion 602 toward the second wall 302.

[0043] By gradually reducing the distance between the first part 601 and the third part 603, the first part 601 and the third part 603 are inclined towards the inside of the second part 602. When the second wall 302 is subjected to external force, the first part 601 and the third part 603 can not only directly bear the force in the lateral direction, but also disperse the force to the first side wall 2, thereby further improving the structural strength of the roller beam 1 and preventing the roller beam 1 from collapsing.

[0044] In practice, the first part 601 and the third part 603 have the same tilt angle and length, so that the bent arm 6 and the second wall 302 form an isosceles trapezoidal support structure to ensure the force balance between the first part 601 and the third part 603 and to ensure the support effect of the bent arm 6 on the second side wall 3.

[0045] In some exemplary embodiments, a first connecting arm 3011 is provided on the free end of the first wall 301 and welded to the first portion 601. A second connecting arm 6031 is provided on the free end of the third portion 603 and welded to the second wall 302, the second connecting arm 6031 extending toward the first portion 601.

[0046] The first connecting arm 3011 ensures sufficient contact area between the first part 601 and the first wall 301, and the welding connection guarantees the connection strength between the first wall 301 and the first part 601, i.e., between the first wall 301 and the second wall 302. Simultaneously, the second connecting arm 6031 ensures a good connection between the third part 603 and the second wall 302. Furthermore, the extension of the second connecting arm 6031 towards the first part 601 prevents excessive angle between the second connecting arm 6031 and the third part 603 from causing breakage under stress, thereby further improving the connection stability between the second connecting arm 6031 and the second wall 302.

[0047] Continue to combine Figure 3 As shown, in some exemplary embodiments, the battery pack frame further includes a mounting beam 7, which is located on the outer side of the second sidewall 3. The mounting beam 7 overlaps with the projection of the second portion 602 in the width direction of the roll forming beam 1. By setting the mounting beam 7 and ensuring that its projection overlaps with the second portion 602 in the width direction, it is ensured that the bending arm 6 provides sufficient support to the connection area of ​​the mounting beam 7 on the second sidewall 3. This guarantees the support effect of the bending arm 6 on the mounting beam 7, prevents the mounting beam 7 from loosening or deforming due to insufficient support, and thus ensures the long-term reliability of the connection between the battery pack and the vehicle body, reducing the safety risks caused by installation structure failure.

[0048] In practical implementation, the mounting beam 7 in this embodiment is also formed by bending and rolling a single sheet of material, resulting in a hollow structure inside the mounting beam 7. The mounting beam 7 has multiple mounting points for mounting the battery pack frame and the battery pack as a whole onto the vehicle chassis. Simultaneously, the mounting beam 7 has reinforcing arms 701 inside, connecting the upper and lower side walls of the mounting beam 7, to improve its structural strength.

[0049] In some exemplary embodiments, the connection between the first sidewall 2 and the top wall 4, and the connection between the first sidewall 2 and the bottom wall 5, are respectively formed with an outwardly protruding first wing 401 and a second wing 501.

[0050] By setting the first convex wing 401 and the second convex wing 501, it is beneficial to increase the structural strength between the first wall 301 and the top wall 4 and the bottom wall 5, improve the bending and torsional resistance of the roller beam 1, and reduce the overall deformation of the beam. At the same time, the first convex wing 401 and the second convex wing 501 can increase the contact area and connection effect between the roller beam 1 and the bottom plate 8 and the top plate of the battery pack, thereby improving the structural strength of the entire battery pack.

[0051] In some exemplary embodiments, the upper and lower ends of the first sidewall 2 are respectively formed with inclined walls 201 that slope inward toward the battery pack. The two inclined walls 201 are connected to the top wall 4 and the bottom wall 5 respectively to form a first wing 401 and a second wing 501.

[0052] By setting the inclined wall 201, when the first side wall 2 is subjected to a lateral force, the force can be transmitted to the top wall 4 and the bottom wall 5 through the inclined wall 201, thereby reducing the stress concentration at the connection position between the first side wall 2 and the top wall 4 and the bottom wall 5, thereby improving the connection reliability between the first side wall 2 and the top wall 4 and the bottom wall 5. At the same time, the inclined wall 201 can provide support for the top wall 4 and the bottom wall 5 to prevent the first side wall 2 from being dented and deformed by the force in the height direction.

[0053] It is worth noting that, regarding the battery pack frame of this embodiment, based on the above exemplary embodiments, in specific implementation, as a preferred embodiment, it is still composed of... Figures 1 to 3 As shown, it may include, for example, a roll forming beam 1, which is formed by bending and rolling a single sheet of material, and the internal structure of the roll forming beam 1 has a cavity.

[0054] The roll forming beam 1 includes a first beam body 1a and a second beam body 1b. Both the first beam body 1a and the second beam body 1b include a longitudinal section 101, two transverse sections 102 located at the front and rear ends of the longitudinal section 101, and a transition section 103 connecting the longitudinal section 101 and the transverse sections 102 with a circular arc transition. The transverse sections 102 of the first beam body 1a are connected to the transverse sections 102 of the second beam body 1b, so that the roll forming beam 1 forms a frame structure.

[0055] Furthermore, the roller beam 1 includes a first sidewall 2 and a second sidewall 3 arranged opposite to each other, and a top wall 4 and a bottom wall 5 connecting the first sidewall 2 and the second sidewall 3. The cavity is formed by the first sidewall 2, the second sidewall 3, the top wall 4, and the bottom wall 5. The second sidewall 3 includes a first wall body 301 connecting to the top wall 4 and a second wall body 302 connecting to the bottom wall 5. The bent arm 6 is connected to the free end of the second wall body 302.

[0056] Furthermore, the bending arm 6 includes a first part 601, a second part 602, and a third part 603 arranged sequentially from top to bottom. The first part 601 connects the top of the second part 602 to the free end of the second wall 302, the second part 602 abuts against the first side wall 2, and the third part 603 connects the bottom of the second part 602 to the second wall 302. The distance between the first part 601 and the third part 603 gradually decreases from the second part 602 towards the second wall 302. A first connecting arm 3011 welded to the first part 601 is provided on the free end of the first wall 301. A second connecting arm 6031 welded to the second wall 302 is provided on the free end of the third part 603, and the second connecting arm 6031 extends towards the first part 601.

[0057] Furthermore, a first wing 401 and a second wing 501 protruding outwards are formed at the connection between the first sidewall 2 and the top wall 4, and at the connection between the first sidewall 2 and the bottom wall 5, respectively. Inclined walls 201, sloping inwards towards the battery pack, are formed at the upper and lower ends of the first sidewall 2, respectively. The two inclined walls 201 are connected to the top wall 4 and the bottom wall 5, respectively, to form the first wing 401 and the second wing 501.

[0058] In the preferred embodiment of the battery pack frame described above, the specific configuration and arrangement of the first beam 1a, the second beam 1b, the roll forming beam 1, etc., can still be referred to the descriptions in the above exemplary embodiments. Furthermore, in this preferred embodiment, the beneficial effects brought about by the design of the first beam 1a, the second beam 1b, the roll forming beam 1, etc., can also be referred to the descriptions in the above exemplary embodiments.

[0059] The battery pack frame in this embodiment adopts the above design. Through the arrangement of the roller-pressed beam 1 and the cavity, the bending and torsional resistance of the roller-pressed beam 1 can be improved, thereby enhancing the overall structural strength and rigidity of the frame. Simultaneously, the transition section 103 ensures the integrity of the longitudinal section 101 and the transverse section 102, and reduces stress at the corners of the roller-pressed beam 1, thus improving the structural strength of the beam corners. Furthermore, the splicing arrangement of the first beam 1a and the second beam 1b facilitates the processing and forming of individual beams and can constitute a frame structure, thereby improving the protection and support effect for the entire battery pack, and ultimately enhancing the overall safety performance of the battery pack.

[0060] An embodiment of the second aspect of this application provides a battery pack having the aforementioned battery pack frame.

[0061] In this embodiment, a base plate 8 is provided at the bottom of the battery pack frame, and crossbeams 801 and longitudinal beams 802 are arranged in an alternating manner inside the battery pack frame to further support the battery pack frame.

[0062] The battery pack in this embodiment, through the above-mentioned battery pack frame setting, can improve the overall structural strength and rigidity of the frame, reduce the stress at the corner of the roller beam 1, improve the structural strength of the corner of the beam, thereby improving the protection and support effect of the entire battery pack, and thus helping to improve the overall safety performance of the battery pack.

[0063] The above descriptions are merely some embodiments of this application and are not intended to limit this application. The technical features or structures in the foregoing different embodiments can be arbitrarily combined to form other specific technical solutions as needed. For those skilled in the art, this application can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of the claims of this application.

Claims

1. A battery pack frame, characterized in that: It includes a roll forming beam, which is formed by bending and rolling a single sheet of material, and the internal structure of the roll forming beam has a cavity; The roller-pressed beam includes a first beam and a second beam. Both the first beam and the second beam include a longitudinal section, two transverse sections located at the front and rear ends of the longitudinal section, and a transition section connecting the longitudinal section and the transverse section with a circular arc transition. The transverse section of the first beam is connected to the transverse section of the second beam, so that the roll-formed beam forms a frame structure.

2. The battery pack frame according to claim 1, characterized in that: The roller beam includes a first sidewall and a second sidewall arranged opposite to each other, and a top wall and a bottom wall connected between the first sidewall and the second sidewall; The cavity is formed by the first sidewall, the second sidewall, the top wall and the bottom wall. A bent arm is provided inside the cavity, which is arranged in a meandering manner between the first sidewall and the second sidewall to divide the cavity into multiple parts that are distributed vertically.

3. The battery pack frame according to claim 2, characterized in that: The second sidewall includes a first wall body connecting to the top wall and a second wall body connecting to the bottom wall; The top of the second wall extends into the cavity to form the bent arm.

4. The battery pack frame according to claim 3, characterized in that: The bending arm includes a first part, a second part, and a third part arranged sequentially from top to bottom; The first part is connected between the top of the second part and the free end of the second wall, the second part abuts against the first side wall, and the third part is connected between the bottom of the second part and the second wall.

5. The battery pack frame according to claim 4, characterized in that: The distance between the first part and the third part gradually decreases from the second part toward the second wall.

6. The battery pack frame according to claim 4, characterized in that: A first connecting arm, welded to the first part, is provided on the free end of the first wall. And / or, the free end of the third part is provided with a second connecting arm welded to the second wall, the second connecting arm extending toward the first part.

7. The battery pack frame according to claim 4, characterized in that: It also includes a mounting beam, which is located on the outer side of the second sidewall; The mounting beam overlaps with the projection of the second part onto the width of the roll forming beam.

8. The battery pack frame according to any one of claims 2 to 7, characterized in that: At the junction of the first sidewall and the top wall, and at the junction of the first sidewall and the bottom wall, a first wing and a second wing protrude outwards, respectively.

9. The battery pack frame according to claim 8, characterized in that: The upper and lower ends of the first sidewall are respectively formed with inclined walls that slope inward toward the inside of the battery pack; The two inclined walls are respectively connected to the top wall and the bottom wall to form the first convex wing and the second convex wing.

10. A battery pack, characterized in that: The battery pack includes a battery pack frame as described in any one of claims 1 to 9.

Images