Battery pack box and battery pack

Abstract

The application provides a battery pack box and a battery pack, and relates to the technical field of batteries. The battery pack box comprises a cross beam assembly, the cross beam assembly comprises a cross beam main body and at least one first support beam, the inside of the cross beam main body is provided with a plurality of cavities, and an inclined rib is arranged in the cavity close to the bottom of the battery pack box. One end of the first support beam is welded to the side wall of the cross beam main body away from the battery monomer, and a first weld and a second weld are formed. The first weld extends along the second direction and is located at the upper part of the first support beam along the third direction. The second weld extends along the third direction and is located on both sides of the first support beam along the second direction. The center line of the first weld along the third direction and the intersection of the inclined rib and the side wall of the cross beam main body away from the battery monomer are aligned. The cross beam assembly of the application has a compact structure, high rigidity and relatively light weight, and the vibration resistance of the cross beam assembly is improved.

Description

Technical Field

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

[0002] With the global energy transition, the electric vehicle industry has experienced explosive growth. As a core component of electric vehicles, the performance of the power battery pack directly determines the vehicle's range, safety, reliability, and lifespan. Electric vehicles encounter various complex operating conditions during operation. Therefore, to improve the battery pack's ability to cope with these conditions, its structural strength must be enhanced, and the design of the battery pack structure directly impacts its overall safety performance.

[0003] The vibration characteristics of battery packs must be designed to match the overall vehicle structure and are often used to evaluate their durability and lifespan. Current vibration requirements for battery packs are becoming increasingly stringent. Inadequate structural designs for the battery pack housing in existing technologies result in prototypes being unable to avoid vibration sweep frequencies, leading to a tendency for the entire pack to crack during vibration. Therefore, providing a battery pack housing with high structural strength is a crucial technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] The purpose of this application is to provide a battery pack housing and a battery pack to solve the technical problem in the prior art where the battery pack housing has poor structural strength and is prone to cracking under vibration.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0006] In a first aspect, this application provides a battery pack housing, including a crossbeam assembly for defining a single battery cell. The crossbeam assembly includes a crossbeam body and at least one first support beam. The crossbeam body extends along a second direction, and one side of the crossbeam body along the first direction abuts against the battery cell. The interior of the crossbeam body is provided with a plurality of cavities along a third direction, and a diagonal rib is provided in a cavity near the bottom of the battery pack housing. One side of the diagonal rib is connected to the side wall of the crossbeam body away from the battery cell, and the other side is inclined downward toward the side wall abutting against the battery cell. At least one first support beam extends along the first direction, and one end of the first support beam is welded to the side wall of the crossbeam body along the first direction away from the battery cell, forming a first weld and a second weld. The first weld extends along the second direction and is located at the upper part of the first support beam along the third direction, and the second weld extends along the third direction and is located on both sides of the first support beam along the second direction. The centerline of the first weld along the third direction and the diagonal rib are aligned with the intersection of the crossbeam body with the side wall away from the battery cell. The first direction, the second direction, and the third direction intersect each other.

[0007] In one or more embodiments of this application, the stress σ of the first weld satisfies: Where E is the elastic modulus of the main body of the crossbeam, A is the inclination angle between the diagonal rib and the plane perpendicular to the third direction, B is the height of the first support beam along the third direction, C is the width of the cavity along the first direction, Hs is the thickness of the first weld in the third direction, and a is twice the sum of the length of the battery pack box along the first direction and the width along the second direction.

[0008] In one or more embodiments of this application, the inclination angle A between the diagonal rib and the plane perpendicular to the third direction satisfies: 20°≤A≤30°.

[0009] In one or more embodiments of this application, the main body of the beam includes a first connecting part, a second connecting part, and a third connecting part connected sequentially along a third direction. In the second direction, the length of the first connecting part is less than the length of the second connecting part, and the length of the second connecting part is less than the length of the third connecting part. In the first direction, the widths of the first connecting part, the second connecting part, and the third connecting part are the same. At least one cavity is formed inside each of the first connecting part, the second connecting part, and the third connecting part. The cross-section of the cavity is rectangular, and the diagonal ribs are provided in the cavity of the third connecting part.

[0010] In one or more embodiments of this application, at least one first support beam includes a first BDU fixing beam and a second BDU fixing beam, which are arranged at a distance from each other along a second direction, forming a first receiving space between the first and second BDU fixing beams for accommodating a BDU module; and / or,

[0011] At least one first support beam includes an electrical component fixing beam for fixing electrical components.

[0012] In one or more embodiments of this application, the crossbeam assembly further includes at least one second support beam extending along a first direction. One end of the second support beam is welded to the side wall of the crossbeam body away from the battery cell along the first direction, forming a third weld. The third weld extends along a third direction and is located on both sides of the second support beam along a second direction. The second support beam and the first support beam are arranged at intervals along the second direction. Along the third direction, the entire third weld is located below the intersection line of the diagonal rib and the side wall of the crossbeam body away from the battery cell.

[0013] In one or more embodiments of this application, at least one second support beam includes a first BMS fixing beam and a second BMS fixing beam. Along a second direction, the first BMS fixing beam and the second BMS fixing beam are arranged at a distance from each other, and a second receiving space for accommodating the BMS module is formed between the first BMS fixing beam and the second BMS fixing beam.

[0014] In one or more embodiments of this application, each second support beam has two mounting protrusions on its upper surface along a third direction, one of which is connected to the side wall of the beam body.

[0015] In one or more embodiments of this application, it further includes:

[0016] The bottom protective plate, the third connecting part, the first support beam and the second support beam are all fixedly connected to the bottom protective plate;

[0017] The frame, together with the bottom protective plate, forms a space for accommodating the battery cells. The third connecting part of the main body of the crossbeam is connected to the frame on both sides along the second direction.

[0018] Secondly, this application provides a battery pack, including the battery pack housing described in any one of the first aspects.

[0019] Based on the above technical solution, the battery pack housing and battery pack of this application have at least the following beneficial technical effects:

[0020] The crossbeam assembly in the battery pack housing of this application includes a crossbeam body and at least one first support beam welded to the side wall of the crossbeam body. The crossbeam body has multiple cavities along a third direction, which can give the crossbeam body high bending strength. The cavity near the bottom of the battery pack housing has diagonal ribs, which can effectively improve the crossbeam body's resistance to compression near the bottom of the battery pack housing, giving the crossbeam assembly high rigidity and effectively improving the service life of the entire crossbeam assembly under various working conditions such as vibration, modal and impact. The first support beam is welded to the side wall of the crossbeam body, forming a first weld and a second weld. The first weld extends along a second direction and is located on the upper part of the first support beam along a third direction, while the second weld extends along a third direction and is located on both sides of the first support beam along the second direction, thus forming a three-sided welded structure. This improves the reliability of the connection between the first support beam and the crossbeam body. Simultaneously, the centerline of the first weld along the third direction and the diagonal rib are aligned with the intersection of the crossbeam body's side wall away from the battery cell, forming an effective force transmission path from the first weld to the diagonal rib, thereby transferring and releasing the force on the first weld through this path. The crossbeam assembly of the battery pack housing in this application has a compact structure, high rigidity, and relatively light weight, improving the crossbeam assembly's vibration resistance and meeting performance requirements to a high degree. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a three-dimensional structural diagram of the battery pack housing provided in the embodiments of this application.

[0023] Figure 2 This is a three-dimensional structural diagram of the crossbeam assembly in the battery pack housing provided in an embodiment of this application.

[0024] Figure 3 This is a top view of the crossbeam assembly in the battery pack housing provided in this application embodiment.

[0025] Figure 4 yes Figure 3 BB section in Figure 1 .

[0026] Figure 5 yes Figure 3 BB section in Figure 2 .

[0027] In the diagram: 10-Battery pack housing; 20-Crossbeam assembly; 30-Frame; 40-Bottom guard plate; 21-Crossbeam body; 22-First support beam; 23-Second support beam; 210-Cavity; 211-First connecting part; 212-Second connecting part; 213-Third connecting part; 214-Diagonal rib; 215-Mounting hole; 216-Allowing groove; 221-First BDU fixing beam; 222-Second BDU fixing beam; 223-Electrical component fixing beam; 231-First BMS fixing beam; 232-Second BMS fixing beam; 2201-First weld; 2202-Second weld; 2203-Third weld; 2301-Mounting protrusion. Detailed Implementation

[0028] To make the technical problems, technical solutions, and beneficial effects to be solved by 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 are not intended to limit the scope of this application.

[0029] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0030] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on this application.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0032] With increasingly stringent requirements for battery pack vibration, some battery pack housing designs are flawed, leading to cracking during vibration and directly impacting the safety and durability of the battery pack.

[0033] Based on the above considerations, in order to solve the technical problem that the battery pack housing structure in the prior art is not strong enough and is prone to cracking under vibration, this application provides a battery pack housing and a battery pack.

[0034] It should be noted that the first direction X, the second direction Y, and the third direction Z described in this application intersect each other. In some embodiments, the first direction X, the second direction Y, and the third direction Z are perpendicular to each other. The first direction X can be the length direction of the battery pack housing 10 or the thickness direction of the crossbeam assembly 20, the second direction Y can be the width direction of the battery pack housing 10 or the length direction of the crossbeam assembly 20, and the third direction Z can be the height direction of the battery pack housing 10 or the height direction of the crossbeam assembly 20.

[0035] The technical solution of this application will now be described in detail with reference to the accompanying drawings.

[0036] Please refer to the following: Figure 1 and Figure 2This application provides a battery pack housing 10, which includes a bottom protective plate 40, a frame 30, and a crossbeam assembly 20. The frame 30 and the bottom protective plate 40 enclose a space for accommodating individual battery cells. The crossbeam assembly 20 is disposed within the space for accommodating individual battery cells and is used to define the individual battery cells. The crossbeam assembly 20 includes a crossbeam body 21 and at least one first support beam 22. One side of the crossbeam body 21 abuts against the individual battery cell to limit the individual battery cell along a first direction X, and the other side is used to connect to at least one first support beam 22. The first support beam 22 is used to fix other structural components.

[0037] Specifically, such as Figure 2 As shown, the main body 21 of the crossbeam extends along the second direction Y. One side of the main body 21 along the first direction X abuts against the battery cell to limit its position. The interior of the main body 21 has multiple cavities 210 along the third direction Z, which are spaced apart. This improves the overall structural rigidity of the crossbeam assembly and reduces its overall weight. The main body 21 also absorbs the expansion force generated by the cyclic expansion of the battery cell. A diagonal rib 214 is provided in the cavity 210 near the bottom of the battery pack housing. One side of the diagonal rib 214 connects to the side wall of the main body 21 away from the battery cell, while the other side slopes downwards towards the side wall abutting against the battery cell. By providing the diagonal rib, the compressive strength of the main body 21 near the bottom of the battery pack housing is effectively improved, giving the crossbeam assembly 20 higher rigidity and effectively extending its service life under various operating conditions such as vibration, modal dynamics, and impact.

[0038] like Figure 2As shown, at least one first support beam 22 extends along a first direction X. One end of the first support beam 22 is welded to the side wall of the crossbeam body 21 away from the battery cell along the first direction X, forming a first weld 2201 and a second weld 2202. It is understood that the first support beam 22 is perpendicular to the crossbeam body 21. The first weld 2201 extends along a second direction Y and is located on the upper part of the first support beam 22 along a third direction Z. The second weld 2202 extends along a third direction Z and is located on both sides of the first support beam 22 along the second direction Y, thus forming a three-sided welded structure between the first support beam 22 and the crossbeam body 21, improving the reliability of the connection between the first support beam 22 and the crossbeam body 21. The centerline of the first weld 2201 along the third direction Z and the intersection of the diagonal rib 214 with the side wall of the crossbeam body 21 away from the battery cell are aligned. It can be understood that the centerline of the first weld 2201 along the third direction Z refers to a line extending along the second direction Y, dividing the thickness of the first weld 2201 along the third direction Z into two symmetrical parts, and intersecting with the crossbeam body 21. The intersection of the diagonal rib 214 and the side wall of the crossbeam body 21 away from the battery cell can be understood as any position on the intersection surface of the diagonal rib 214 and the side wall of the crossbeam body 21 away from the battery cell in the third direction Z. In some embodiments, it can be the centerline on the intersection surface of the diagonal rib 214 and the side wall of the crossbeam body 21 away from the battery cell in the third direction. Through the above arrangement, an effective force transmission path can be formed from the first weld 2201 to the diagonal rib 214, thereby transmitting and releasing the force on the first weld 2201 through the above force transmission path.

[0039] In some embodiments, such as Figure 5 As shown, the stress σ of the first weld 2201 satisfies: Where E is the elastic modulus of the main beam 21, A is the inclination angle between the diagonal rib 214 and the plane perpendicular to the third direction Z, B is the height of the first support beam 22 along the third direction Z, C is the width of the cavity 210 along the first direction X, Hs is the thickness of the first weld 2201 in the third direction Z, and a is twice the sum of the length of the battery pack housing 10 along the first direction X and the width along the second direction Y. It can be understood that the stress of the first weld 2201 is related to the inclination angle of the diagonal rib 214 in the main beam 21, the size of the battery pack housing 10, and the thickness of the first weld 2201. Therefore, when designing the beam assembly 20, the stress of the first weld 2201 can be designed to avoid excessive stress in the first weld 2201, which could lead to cracking.

[0040] In some embodiments, the inclination angle A between the diagonal rib 214 and the plane perpendicular to the third direction Z satisfies: 20°≤A≤30°. This allows the diagonal rib 214 to form a closed cavity with the sidewall of the beam body 21, effectively improving the bottom resistance to compressive deformation of the beam body 21. Simultaneously, it gives the entire beam assembly 20 high rigidity, effectively extending the service life of the entire system under various working conditions such as vibration, modal dynamics, and impact, and better meeting performance requirements.

[0041] Please refer to Figures 2 to 4 As shown, in some embodiments, the main body 21 of the crossbeam includes a first connecting portion 211, a second connecting portion 212, and a third connecting portion 213 connected sequentially along a third direction Z. It can be understood that the first connecting portion 211, the second connecting portion 212, and the third connecting portion 213 are arranged sequentially along the third direction Z. Specifically, along the second direction Y, the length of the first connecting portion 211 is less than the length of the second connecting portion 212, and the length of the second connecting portion 212 is less than the length of the third connecting portion 213. Along the first direction X, the widths of the first connecting portion 211, the second connecting portion 212, and the third connecting portion 213 are the same, thus ensuring that the sides of the first connecting portion 211, the second connecting portion 212, and the third connecting portion 213 are on the same plane, allowing them to abut against the battery cell. Each of the first connecting portion 211, the second connecting portion 212, and the third connecting portion 213 has at least one cavity 210 inside. The cross-section of the cavity 210 is rectangular, and a diagonal rib 214 is provided within the cavity 210 of the third connecting portion 213. This gives the main body of the beam 21 high bending strength, while the diagonal ribs 214 can form a closed cavity with the side wall of the main body of the beam 21 within the cavity 210, which can effectively improve the bottom resistance to extrusion deformation of the main body of the beam 21.

[0042] In some embodiments, such as Figure 2 As shown, the first connecting part 211 can share the same surface with the second connecting part 212. That is, along the third direction Z, the upper surface of the second connecting part 212 can serve as the lower surface of the first connecting part 211. This improves the overall structural rigidity and reduces the overall weight of the structure. Similarly, the second connecting part 212 can share the same surface with the third connecting part 213. That is, along the third direction Z, the upper surface of the third connecting part 213 can serve as the lower surface of the second connecting part 212. This improves the overall structural rigidity and reduces the overall weight of the structure. The upper surface of the first connecting part 211 can be connected to the pressure strip that fixes the battery cell. The upper surface of the second connecting part 212 can provide lateral rigidity for the entire crossbeam body 21. The upper surface of the third connecting part 213 can provide anti-compression for the crossbeam body 21. The lower surface of the third connecting part 213 is used to connect to the bottom protective plate 40.

[0043] In some embodiments, such as Figure 2 As shown, to achieve the fixation between the crossbeam body 21 and the battery cell, the upper surface of the first connecting part 211 is provided with mounting holes 215 for fixing the pressure strip of the battery cell, thereby achieving a fixed connection between the crossbeam body 21 and the battery cell pressure strip. In some embodiments, fixing holes can also be provided on the side of the first connecting part 211 away from the battery cell for fixing structural components. Of course, fixing holes can also be provided on the side of the second connecting part 212 away from the battery cell, and the position of the fixing holes can be set as needed. The lower surface of the third connecting part 213 is provided with fixing holes for fixing the third connecting part 213 to the bottom guard plate 40 of the battery pack housing 10, so as to fix the third connecting part 213 to the battery pack housing 10 by fasteners. Along the second direction Y, the two ends of the third connecting part 213 are respectively connected to the frame 30 of the battery pack housing 10 so as to form a stable force transmission path to transmit force to the battery pack housing 10.

[0044] like Figure 2 As shown, along the second direction Y, a clearance groove 216 is provided in the middle of the first connecting portion 211 and the second connecting portion 212. The clearance groove 216 is recessed from the surface of the first connecting portion 211 toward the third connecting portion 213. The groove depth of the clearance groove 216 can be consistent with the sum of the heights of the first connecting portion 211 and the second connecting portion 212 in the third direction Z, that is, the bottom of the clearance groove 216 is the upper surface of the third connecting portion 213. This clearance groove 216 can provide clearance space for wire harnesses or copper busbars in the battery pack, facilitating wiring.

[0045] In some embodiments, such as Figure 2 As shown, along the second direction Y, at least one end of the second connecting portion 212 away from the clearance groove 216 can protrude beyond one end of the first connecting portion 211 away from the clearance groove 216, so that a stepped surface can be formed between the first connecting portion 211 and the second connecting portion 212, thereby facilitating the arrangement of structural components such as wire harnesses or copper busbars. In some other embodiments, such as Figure 2 As shown, along the second direction Y, at least one end of the third connecting portion 213 can protrude from the end of the second connecting portion 212 away from the relief groove 216, so that a stepped surface can be formed between the second connecting portion 212 and the third connecting portion 213, thereby facilitating the arrangement of structural components such as wire harnesses or copper busbars.

[0046] In some embodiments, such as Figure 2As shown, at least one first support beam 22 includes a first BDU fixing beam 221 and a second BDU fixing beam 222. Along the second direction Y, the first BDU fixing beam 221 and the second BDU fixing beam 222 are spaced apart from each other, forming a first receiving space between them for accommodating the BDU module. The BDU module can then be fixed to the first BDU fixing beam 221 and the second BDU fixing beam 222. To achieve a fixed connection with the BDU module, fixing holes are provided on the upper surfaces of the first BDU fixing beam 221 and the second BDU fixing beam 222, so that the BDU module can be fixed to the first BDU fixing beam 221 and the second BDU fixing beam 222 using fasteners. The lower surfaces of the first BDU fixing beam 221 and the second BDU fixing beam 222 can be fixed to the bottom protective plate 40 of the battery pack housing 10.

[0047] In some embodiments, such as Figure 2 As shown, at least one first support beam 22 includes an electrical component fixing beam 223, which is used to fix electrical components. The electrical components can be wire harnesses, aluminum busbars, etc. The upper surface of the electrical component fixing beam 223 has fixing holes so that the electrical components can be fixed to the electrical component fixing beam 223 using fasteners. The lower surface of the electrical component fixing beam 223 can be fixed to the bottom protective plate 40 of the battery pack housing 10.

[0048] In some embodiments, such as Figure 2 As shown, the crossbeam assembly 20 also includes at least one second support beam 23, which can be used to fix other structural components. The second support beam 23 extends along a first direction X, and one end of the second support beam 23 is welded to the side wall of the crossbeam body 21 away from the battery cell along the first direction X, forming a third weld 2203. The third weld 2203 extends along a third direction Z and is located on both sides of the second support beam 23 along the second direction Y. It can be understood that the welding between the second support beam 23 and the crossbeam body 21 is a double-sided welding, so that the second support beam 23 and the crossbeam body 21 have reliable welding strength. The second support beam 23 and the first support beam 22 are arranged at intervals along the second direction Y. Along the third direction Z, the entire third weld 2203 is located below the intersection line of the diagonal rib 214 and the side wall of the crossbeam body 21 away from the battery cell, thereby avoiding stress concentration areas in the structure.

[0049] In some embodiments, such as Figure 2As shown, at least one second support beam 23 includes a first BMS fixing beam 231 and a second BMS fixing beam 232. Along the second direction Y, the first BMS fixing beam 231 and the second BMS fixing beam 232 are spaced apart from each other, forming a second receiving space between them for accommodating the BMS module. The BMS module can then be fixed to the first BMS fixing beam 231 and the second BMS fixing beam 232. To achieve a fixed connection with the BMS module, fixing holes are provided on the upper surfaces of the first BMS fixing beam 231 and the second BMS fixing beam 232, so that the BMS module can be fixed to the first BMS fixing beam 231 and the second BMS fixing beam 232 using fasteners. The lower surfaces of the first BMS fixing beam 231 and the second BMS fixing beam 232 can be fixed to the bottom protective plate 40 of the battery pack housing 10. Each second support beam 23 has two mounting protrusions 2301 on its upper surface along the third direction Z. The mounting protrusions 2301 are used for fixed connection with the BMS module, and one of the mounting protrusions 2301 is connected to the side wall of the crossbeam body 21. This provides lateral support for the BMS module, preventing it from loosening or being damaged due to long-term vibration, and directly transmits the weight and force of the BMS module to the crossbeam body 21, and then through the crossbeam body 21 to the battery pack housing 10, forming a stable force transmission path.

[0050] The crossbeam assembly of the battery pack housing in this application has a compact structure, high rigidity, and relatively light weight, which improves the vibration resistance of the crossbeam assembly.

[0051] On the other hand, this application provides a battery pack including the battery pack housing described in any of the foregoing claims.

[0052] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery pack housing, characterized in that, Includes a crossbeam assembly for defining a battery cell, the crossbeam assembly comprising: The main body of the crossbeam extends along the second direction. One side of the main body of the crossbeam abuts against the battery cell along the first direction. The interior of the main body of the crossbeam has multiple cavities along the third direction. An inclined rib is provided in the cavity near the bottom of the battery pack box. One side of the inclined rib is connected to the side wall of the main body of the crossbeam away from the battery cell, and the other side is inclined downward toward the side wall abutting against the battery cell. At least one first support beam extends along the first direction, one end of the first support beam is welded to the side wall of the crossbeam body away from the battery cell along the first direction, forming a first weld and a second weld, wherein the first weld extends along the second direction and is located on the upper part of the first support beam along a third direction, and the second weld extends along the third direction and is located on both sides of the first support beam along the second direction, wherein the first weld is aligned with the center line of the third direction and the intersection of the diagonal rib and the side wall of the crossbeam body away from the battery cell, wherein the first direction, the second direction and the third direction intersect each other.

2. The battery pack housing according to claim 1, characterized in that, The stress σ of the first weld satisfies: Wherein, E is the elastic modulus of the main body of the crossbeam, A is the inclination angle between the inclined rib and the plane perpendicular to the third direction, B is the height of the first support beam along the third direction, C is the width of the cavity along the first direction, Hs is the thickness of the first weld in the third direction, and a is twice the sum of the length of the battery pack box along the first direction and the width along the second direction.

3. The battery pack housing according to claim 2, characterized in that, The inclination angle A between the inclined rib and the plane perpendicular to the third direction satisfies: 20°≤A≤30°.

4. The battery pack housing according to any one of claims 1 to 3, characterized in that, The main body of the crossbeam includes a first connecting part, a second connecting part, and a third connecting part connected sequentially along the third direction. In the second direction, the length of the first connecting part is less than the length of the second connecting part, and the length of the second connecting part is less than the length of the third connecting part. In the first direction, the widths of the first connecting part, the second connecting part, and the third connecting part are the same. At least one cavity is formed inside each of the first connecting part, the second connecting part, and the third connecting part. The cross-section of the cavity is rectangular, and the diagonal rib is provided in the cavity of the third connecting part.

5. The battery pack housing according to claim 1, characterized in that, At least one of the first support beams includes a first BDU fixing beam and a second BDU fixing beam, which are arranged at intervals relative to each other along the second direction, forming a first receiving space between the first BDU fixing beam and the second BDU fixing beam for accommodating the BDU module; and / or, At least one of the first support beams includes an electrical component fixing beam for fixing electrical components.

6. The battery pack housing according to claim 4, characterized in that, The crossbeam assembly further includes at least one second support beam extending along the first direction. One end of the second support beam is welded to the side wall of the crossbeam body away from the battery cell along the first direction, forming a third weld. The third weld extends along the third direction and is located on both sides of the second support beam along the second direction. The second support beam and the first support beam are arranged at intervals along the second direction. Along the third direction, the entire third weld is located below the intersection line of the diagonal rib and the side wall of the crossbeam body away from the battery cell.

7. The battery pack housing according to claim 6, characterized in that, At least one second support beam includes a first BMS fixing beam and a second BMS fixing beam. Along the second direction, the first BMS fixing beam and the second BMS fixing beam are arranged at intervals relative to each other, and a second receiving space for accommodating the BMS module is formed between the first BMS fixing beam and the second BMS fixing beam.

8. The battery pack housing according to claim 7, characterized in that, Each of the second support beams has two mounting protrusions on its upper surface along the third direction, one of which is connected to the side wall of the beam body.

9. The battery pack housing according to claim 6, characterized in that, Also includes: The bottom protective plate, the third connecting part, the first support beam and the second support beam are all fixedly connected to the bottom protective plate; The frame, together with the bottom protective plate, forms a space for accommodating the battery cell, and the third connecting portion of the main body of the crossbeam is connected to the frame on both sides along the second direction.

10. A battery pack, characterized in that, Includes the battery pack housing as described in any one of claims 1 to 9.

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