Battery pack lower case, battery pack, and vehicle

Abstract

The present disclosure relates to a battery pack lower case, a battery pack, and a vehicle. The battery pack lower case comprises a load-bearing beam and a bottom guard plate located below the load-bearing beam, wherein the load-bearing beam is provided with a maintenance opening, and the bottom guard plate covers at least the maintenance opening and is detachably connected to the load-bearing beam; and a reinforcing structure is provided on the side of the load-bearing beam facing away from the bottom guard plate. The reinforcing structure is arranged on the top surface of the load-bearing beam, and the reinforcing structure is located on the inner side of the load-bearing beam and also on the inner side of the battery pack lower case. Compared with the solution in the prior art in which reinforcing ribs are arranged on the bottom surface of a die-cast beam and exposed outside the bottom guard plate, the bottom surface of the load-bearing beam of the battery pack lower case in the present disclosure is flatter, and during driving of the vehicle, the reinforcing structure does not come into contact with an airflow, such that the occurrence of aerodynamic drag caused by the reinforcing structure cutting through the airflow, and an increased energy consumption resulting from the aerodynamic drag generated by the reinforcing structure are avoided, which is conducive to improving the endurance mileage of the vehicle having the battery pack lower case and realizes a better user experience.

Description

Battery pack lower box, battery pack and vehicle

[0001] Cross-reference to related applications

[0002] The present application claims priority to the Chinese patent application No. 202420802850.2, filed on April 17, 2024, and entitled "Battery pack lower box, battery pack and vehicle", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0003] The present disclosure relates to the technical field of vehicles, and in particular to a battery pack lower box, a battery pack and a vehicle. BACKGROUND

[0004] The lower box of the battery pack is provided with a die-casting beam for carrying circuit breaking units and other components, and the die-casting beam is located at least one side of the lower box. In order to facilitate the maintenance of the circuit breaking units and other components, a maintenance opening is usually formed on the die-casting beam. The bottom surface of the die-casting beam is connected with a bottom guard plate, and the bottom guard plate is arranged at the maintenance opening, and the bottom guard plate plays a protective role on the circuit breaking units and other components.

[0005] The bottom surface of the die-casting beam is usually provided with a reinforcing rib, which is exposed outside the bottom guard plate. The reinforcing rib makes the structural strength of the die-casting beam relatively high. However, during the driving of the vehicle, the reinforcing rib will continuously cut the airflow, thereby generating a large wind resistance, resulting in a large energy loss of the new energy vehicle, affecting the cruising range, and the user experience is poor. SUMMARY

[0006] To solve the above technical problems, the present disclosure provides a battery pack lower box, a battery pack and a vehicle.

[0007] In a first aspect, the present disclosure provides a battery pack lower box, comprising a load-bearing beam and a bottom guard plate located below the load-bearing beam.

[0008] A maintenance opening is formed on the load-bearing beam, and the bottom guard plate is arranged at least at the maintenance opening and detachably connected with the load-bearing beam. The side of the load-bearing beam away from the bottom guard plate is provided with a reinforcing structure.

[0009] Optionally, the side of the load-bearing beam away from the bottom guard plate is provided with a groove, and the reinforcing structure is arranged in the groove.

[0010] Optionally, the side of the reinforcing structure away from the bottom guard plate is not higher than the groove opening of the groove.

[0011] Optionally, the reinforcing structure comprises a plurality of transverse ribs and a plurality of longitudinal ribs.

[0012] The plurality of horizontal ribs are arranged at intervals along the length direction of the load-bearing beam, the plurality of vertical ribs are arranged at intervals along the width direction of the load-bearing beam, and the adjacent horizontal rib and vertical rib are fixed relative to each other.

[0013] Optionally, mounting holes for connecting peripheral parts are formed on the load-bearing beam, and at least one horizontal rib and at least one vertical rib are arranged at intervals on the circumferential outer side of the mounting holes.

[0014] Optionally, along the circumference of the maintenance opening, the reinforcing structure surrounds at least part of the outer side of the maintenance opening.

[0015] Optionally, the bottom guard plate has a hollow cavity, at least one reinforcing member is arranged in the hollow cavity, one end of the reinforcing member is connected with the top wall of the hollow cavity, and the other end of the reinforcing member is connected with the bottom wall of the hollow cavity, so as to divide the hollow cavity into at least two energy absorption cavities.

[0016] Optionally, the reinforcing member is at least two, and the at least two reinforcing members are arranged at intervals along the length direction of the load-bearing beam.

[0017] And / or, the at least two reinforcing members are arranged at intervals along the width direction of the load-bearing beam.

[0018] In a second aspect, the present disclosure provides a battery pack, comprising the battery pack lower box as described above.

[0019] In a third aspect, the present disclosure provides a vehicle, comprising the battery pack lower box as described above, or the battery pack as described above.

[0020] Compared with the prior art, the technical scheme provided by the embodiments of the present disclosure has the following advantages:

[0021] The battery pack lower box, the battery pack and the vehicle provided by the disclosure are characterized in that a load-bearing beam is arranged, and a bottom guard plate is arranged below the load-bearing beam, the load-bearing beam is used to bear and connect components such as a circuit cutting unit of the battery pack. A maintenance opening is arranged on the load-bearing beam, and the bottom guard plate is at least arranged at the maintenance opening and detachably connected with the load-bearing beam. When the bottom guard plate is detached from the load-bearing beam, the maintenance opening is exposed, and maintenance is facilitated. A reinforcing structure is arranged on the side of the load-bearing beam away from the bottom guard plate, that is, the reinforcing structure is arranged on the top surface of the load-bearing beam, and the reinforcing structure is located on the inner side of the load-bearing beam and also located on the inner side of the battery pack lower box. Compared with the prior art in which a reinforcing rib is arranged on the bottom surface of a die-casting beam and exposed outside the bottom guard plate, the bottom surface of the load-bearing beam of the battery pack lower box of the disclosure is relatively flat, and the reinforcing structure does not contact airflow during driving of the vehicle, so that the phenomenon of wind resistance caused by cutting of the airflow by the reinforcing structure is avoided, and the phenomenon of increased energy consumption caused by wind resistance of the reinforcing structure is avoided, which is beneficial to improving the cruising range of the vehicle with the battery pack lower box and providing a better user experience. BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings, which are incorporated into and form part of the specification, illustrate embodiments consistent with the disclosure and serve to explain the principles of the disclosure together with the specification.

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the disclosure or the prior art, the accompanying drawings required to be used in the embodiments or the prior art description will be briefly introduced. Obviously, those skilled in the art can obtain other drawings according to these drawings without any creative labor.

[0024] Fig. 1 is an axonometric view of the load-bearing beam of the battery pack lower box according to the embodiments of the disclosure;

[0025] Fig. 2 is a partial exploded view of Fig. 1;

[0026] Fig. 3 is an axonometric view of the load-bearing beam of the battery pack lower box according to the embodiments of the disclosure from another perspective;

[0027] Fig. 4 is a partial exploded view of Fig. 3;

[0028] Fig. 5 is a top view of the load-bearing beam of the battery pack lower box according to the embodiments of the disclosure;

[0029] Fig. 6 is a partial enlarged view of Fig. 5;

[0030] Fig. 7 is an axonometric view of the bottom guard plate of the battery pack lower box according to the embodiments of the disclosure;

[0031] Fig. 8 is a partial structural schematic view of the bottom guard plate of the battery pack lower box according to the embodiments of the disclosure;

[0032] Fig. 9 is a top view of the bottom guard plate of the battery pack lower box according to the embodiment of the present disclosure;

[0033] Fig. 10 is a side view of the bottom guard plate of the battery pack lower box according to the embodiment of the present disclosure.

[0034] Wherein, 1, the force beam; 2, the bottom guard plate; 3, the maintenance opening; 4, the reinforcing structure; 41, the cross rib; 42, the longitudinal rib; 5, the recess; 6, the mounting hole; 7, the reinforcing piece; 8, the energy absorption cavity. Specific embodiments

[0035] In order to more clearly understand the above-mentioned purposes, features and advantages of the present disclosure, the schemes of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0036] In the following description, a lot of specific details are set forth in order to facilitate a thorough understanding of the present disclosure, but the present disclosure can also be implemented in other different ways from those described herein; Obviously, the embodiments in the description are only a part of the embodiments of the present disclosure, not all the embodiments.

[0037] Referring to Figs. 1-10, the present embodiment provides a battery pack lower box, which comprises a force beam 1 and a bottom guard plate 2 located below the force beam 1. The force beam 1 is provided with a maintenance opening 3, and the bottom guard plate 2 is at least covered at the maintenance opening 3 and detachably connected with the force beam 1; The side of the force beam 1 away from the bottom guard plate 2 is provided with a reinforcing structure 4, and the reinforcing structure 4 is fixed relative to the force beam 1.

[0038] The force beam 1 is usually located on one side of the battery pack lower box, and the force beam 1 can carry and connect the circuit cut-off unit and other components of the battery pack, which are usually located on the inner side of the force beam 1, i.e. the side of the force beam 1 away from the bottom guard plate 2.

[0039] The bottom guard plate 2 is detachably connected below the force beam 1 and at least covers the maintenance opening 3 of the bottom guard plate 2, which is convenient to install and disassemble. If the components on the inner side of the force beam 1 need to be repaired, the bottom guard plate 2 is detached from the force beam 1, and the maintenance opening 3 is exposed, which is convenient for maintenance.

[0040] In specific implementation, the bottom guard plate 2 can be connected below the force beam 1 by bolts or other fasteners.

[0041] Compared with the prior art in which the reinforcing rib is arranged on the bottom surface of the die-casting beam and exposed outside the bottom guard plate 2, the bottom surface of the load-bearing beam 1 of the present embodiment is smoother, which reduces the wind resistance of the vehicle to a certain extent during driving, reduces energy consumption, is conducive to improving the cruising range of the vehicle with the battery pack lower box, and has a good user experience. Moreover, the reinforcing structure 4 located on the inner side of the load-bearing beam 1 will not be in contact with the airflow during driving of the vehicle, avoiding the phenomenon of wind resistance caused by the reinforcing structure 4 cutting the airflow, thereby avoiding the phenomenon of increased energy consumption caused by the reinforcing structure 4 generating wind resistance, which is conducive to improving the cruising range of the vehicle with the battery pack lower box, and has a good user experience.

[0042] The reinforcing structure 4 is located on the inner side of the load-bearing beam 1 and is relatively fixed with the load-bearing beam 1. The reinforcing structure 4 enhances the structural strength of the load-bearing beam 1.

[0043] In some implementations, the reinforcing structure 4 can be integrally formed with the load-bearing beam 1, for example, which has good integrity and high structural strength.

[0044] The battery pack lower box provided in the present embodiment comprises a load-bearing beam 1 and a bottom guard plate 2 arranged below the load-bearing beam 1. The load-bearing beam 1 is used to bear and connect components such as a circuit cut-off unit of a battery pack. A maintenance opening 3 is formed on the load-bearing beam 1. The bottom guard plate 2 is arranged at least at the maintenance opening 3 and is detachably connected with the load-bearing beam 1. When the bottom guard plate 2 is detached from the load-bearing beam 1, the maintenance opening 3 is exposed, which is convenient for maintenance. A reinforcing structure 4 is arranged on the side of the load-bearing beam 1 away from the bottom guard plate 2, that is, the reinforcing structure 4 is arranged on the inner side of the load-bearing beam 1. Compared with the prior art in which the reinforcing rib is arranged on the bottom surface of the die-casting beam and exposed outside the bottom guard plate 2, the bottom surface of the load-bearing beam 1 of the present embodiment is smoother, which reduces the wind resistance of the vehicle to a certain extent during driving, reduces energy consumption, is conducive to improving the cruising range of the vehicle with the battery pack lower box, and has a good user experience. Moreover, the reinforcing structure 4 located on the inner side of the load-bearing beam 1 will not be in contact with the airflow during driving of the vehicle, avoiding the phenomenon of wind resistance caused by the reinforcing structure 4 cutting the airflow, thereby avoiding the phenomenon of increased energy consumption caused by the reinforcing structure 4 generating wind resistance, which is conducive to improving the cruising range of the vehicle with the battery pack lower box, and has a good user experience.

[0045] In some embodiments, referring to FIGS. 1 and 2, a groove 5 is arranged on the side of the load-bearing beam 1 away from the bottom guard plate 2, and the reinforcing structure 4 is arranged in the groove 5, that is, the groove 5 is arranged on the inner side of the load-bearing beam 1, and the reinforcing structure 4 is arranged in the groove 5. In this way, the reinforcing structure 4 to a certain extent avoids occupying the space of components such as the circuit cut-off unit, and does not interfere with the components such as the circuit cut-off unit, thereby having high space utilization.

[0046] In some embodiments, referring to FIGS. 1 and 2, the side of the reinforcing structure 4 facing away from the bottom guard plate 2 is not higher than the groove lip of the groove 5, that is, the reinforcing structure 4 is completely arranged in the groove 5 in the thickness direction of the load-bearing beam 1, and the size of the reinforcing structure 4 in the thickness direction of the load-bearing beam 1 is smaller than the groove depth of the groove 5, which further ensures that the reinforcing structure 4 does not interfere with the circuit breaker unit and other components, and the space utilization is higher.

[0047] In some embodiments, referring to FIGS. 5 and 6, the reinforcing structure 4 includes a plurality of cross ribs 41 and a plurality of longitudinal ribs 42, the plurality of cross ribs 41 are arranged at intervals along the length direction of the load-bearing beam 1, the plurality of longitudinal ribs 42 are arranged at intervals along the width direction of the load-bearing beam 1, and adjacent cross ribs 41 and longitudinal ribs 42 are fixed relative to each other, which is simple in structure and easy to manufacture.

[0048] That is, the reinforcing structure 4 includes a plurality of cross ribs 41 and a plurality of longitudinal ribs 42, the plurality of cross ribs 41 and the plurality of longitudinal ribs 42 are arranged alternately, such as forming a "well" structure, arranged in order, and adjacent cross ribs 41 and adjacent longitudinal ribs 42 are fixed together to form an overall structure, which has a good and uniform force transmission effect, and the structural strength of the load-bearing beam 1 is high.

[0049] In other embodiments, the reinforcing structure 4 may, for example, include a plurality of arc-shaped ribs arranged at intervals between the maintenance opening 3 and the outer wall of the load-bearing beam 1 along the radial direction of the maintenance opening 3, and the shape of the arc-shaped ribs matches the shape of at least part of the outer contour of the maintenance opening 3.

[0050] In some embodiments, referring to FIG. 6, the mounting hole 6 for connecting peripheral components is provided on the load-bearing beam 1, and at least one cross rib 41 and at least one longitudinal rib 42 are arranged at intervals on the circumferential outer side of the mounting hole 6, that is, the mounting hole 6 is provided in the area of the reinforcing structure 4 on the load-bearing beam 1, at least one cross rib 41 and at least one longitudinal rib 42 are connected to the outer side wall in the circumferential direction of the mounting hole 6, the cross ribs 41 and the longitudinal ribs 42 in the circumferential direction of the mounting hole 6 are arranged at intervals along the circumferential direction of the mounting hole 6, which enhances the structural strength of the load-bearing beam 1 at the mounting hole 6, improves the overall structural strength of the load-bearing beam 1, and thus enhances the connection strength of the load-bearing beam 1 and the peripheral components.

[0051] In some embodiments, referring to FIGS. 1 to 6, along the circumferential direction of the maintenance opening 3, the reinforcing structure 4 is arranged around at least part of the outer side of the maintenance opening 3, so that the structural strength of the load-bearing beam 1 at the maintenance opening 3 is high, and the overall structural strength of the load-bearing beam 1 is further improved.

[0052] In some embodiments, as shown in FIGS. 8 and 10, the bottom guard plate 2 has a hollow cavity, at least one reinforcing member 7 is arranged in the hollow cavity, one end of the reinforcing member 7 is connected with the top wall of the hollow cavity of the bottom guard plate 2, and the other end of the reinforcing member 7 is connected with the bottom wall of the hollow cavity of the bottom guard plate 2 (i.e., the reinforcing member 7 is arranged in the hollow cavity of the bottom guard plate 2 along the thickness direction of the bottom guard plate 2), so as to divide the hollow cavity into at least two energy absorption cavities 8.

[0053] The bottom guard plate 2 is arranged in a hollow structure, which conforms to the design trend of light weight, is beneficial to improve the endurance mileage, and relieves the mileage anxiety of the user.

[0054] Meanwhile, the reinforcing member 7 is arranged in the hollow cavity of the bottom guard plate 2, and the reinforcing member 7 divides the hollow cavity of the bottom guard plate 2 into at least two energy absorption cavities 8. On the one hand, the structural strength of the bottom guard plate 2 is increased, and the protection of the parts on the inner side of the load-bearing beam 1 is better. On the other hand, if an obstacle is encountered, the design of the energy absorption cavity 8 can make the bottom guard plate 2 collapse rapidly, to a certain extent, avoiding the phenomenon that the parts on the inner side of the load-bearing beam 1 are damaged, thereby prolonging the service life to a certain extent.

[0055] It should be noted that the bottom guard plate 2 of the present embodiment is an integrated structure formed by extrusion.

[0056] In the prior art, a maintenance plate and a bottom guard plate are usually arranged below the load-bearing beam, the maintenance plate is provided with a maintenance opening matched with the maintenance opening on the load-bearing beam, and the maintenance plate and the bottom guard plate are connected below the load-bearing beam by bolts and the like. The maintenance plate is located between the load-bearing beam and the bottom guard plate, and the bottom guard plate covers the maintenance opening and the maintenance opening. Compared with the scheme of arranging the maintenance plate and the bottom guard plate below the load-bearing beam in the prior art, the present embodiment arranges the bottom guard plate with an integrated structure below the load-bearing beam, which is simple in structure and simplifies the assembly process of the battery pack lower box.

[0057] Furthermore, compared with the technical scheme of arranging the maintenance plate and the bottom guard plate below the load-bearing beam and arranging the maintenance plate bolt fastening point and the bottom guard plate bolt fastening point on the load-bearing beam in the prior art, the present embodiment arranges the bottom guard plate with an integrated structure below the load-bearing beam, only needs to arrange the bolt fastening point of the bottom guard plate on the load-bearing beam, to a certain extent, reduces the required bolt fastening points on the load-bearing beam, not only simplifies the assembly process and saves the assembly time, but also to a certain extent, reduces the time required for machining the bolt fastening point on the load-bearing beam, and reduces the machining difficulty.

[0058] Meanwhile, the bottom protection plate 2 is arranged as a hollow structure, and the reinforcing member 7 is arranged in the hollow cavity of the bottom protection plate 2. Compared with the prior art scheme of arranging a convex bump for collapse on the bottom surface of the bottom protection plate 2, the arrangement not only ensures the structural strength of the bottom protection plate 2, but also avoids the phenomenon of wind resistance caused by the cutting of air flow by the convex bump, thereby avoiding the phenomenon of increased energy consumption caused by the wind resistance of the convex bump on the bottom surface of the bottom protection plate 2, and further improving the endurance mileage of the vehicle with the battery pack lower box, and the user experience is good

[0059] In some embodiments, as shown in FIG. 8, the reinforcing member 7 is at least two, and the at least two reinforcing members 7 are arranged in the length direction of the load-bearing beam 1 and / or arranged in the width direction of the load-bearing beam 1.

[0060] That is, the hollow cavity of the bottom protection plate 2 is provided with a plurality of reinforcing members 7, which can be arranged in the length direction of the load-bearing beam 1, or arranged in the width direction of the load-bearing beam 1, of course, the plurality of reinforcing members 7 can also be staggered arranged in the hollow cavity of the bottom protection plate 2, further ensuring the structural strength of the bottom protection plate 2, and can collapse more quickly when encountering obstacles.

[0061] The embodiment also provides a battery pack, which comprises the battery pack lower box.

[0062] The battery pack lower box in the embodiment has the same specific structure and implementation principle as the battery pack lower box provided in the above embodiments, and can bring the same or similar technical effects, and will not be described one by one here, and the specific description can be referred to the description of the above embodiments.

[0063] The embodiment also provides a vehicle, which comprises the battery pack lower box or comprises the battery pack.

[0064] The battery pack lower box in the embodiment has the same specific structure and implementation principle as the battery pack lower box provided in the above embodiments, and can bring the same or similar technical effects, and will not be described one by one here, and the specific description can be referred to the description of the above embodiments.

[0065] The battery pack in the embodiment has the same specific structure and implementation principle as the battery pack provided in the above embodiments, and can bring the same or similar technical effects, and will not be described one by one here, and the specific description can be referred to the description of the above embodiments.

[0066] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0067] The foregoing description is intended only to provide specific embodiments of the present disclosure, intended to enable those skilled in the art to understand and implement the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure is not intended to be limited to the embodiments described herein, but rather to be construed in the broadest manner consistent with the principles and novel features disclosed herein.

Claims

1. A battery pack lower case, comprising a load-bearing beam and a bottom guard plate located below the load-bearing beam. A maintenance opening is formed on the load-bearing beam, and the bottom guard plate is at least provided at the maintenance opening and detachably connected with the load-bearing beam.

2. The battery pack lower case according to claim 1, wherein A reinforcing structure is provided on the side of the load-bearing beam away from the bottom guard plate.

3. The battery pack lower case according to claim 2, wherein, The reinforcing structure is provided in a groove on the side of the load-bearing beam away from the bottom guard plate.

4. The battery pack lower case according to any one of claims 1-3, wherein, The side of the reinforcing structure away from the bottom guard plate is not higher than the groove. The reinforcing structure comprises a plurality of horizontal ribs and a plurality of vertical ribs.

5. The battery pack lower case of claim 4, wherein, The horizontal ribs are arranged along the length direction of the load-bearing beam, and the vertical ribs are arranged along the width direction of the load-bearing beam.

6. The battery pack lower case according to any one of claims 1-5, wherein, The horizontal ribs and the vertical ribs are fixed relative to each other.

7. The battery pack lower case according to any one of claims 1 to 6, wherein, Mounting holes for connecting peripheral parts are formed on the load-bearing beam, and at least one horizontal rib and at least one vertical rib are arranged on the outer side of the mounting holes.

8. The battery pack lower case of claim 7, wherein, The reinforcing structure is arranged around at least part of the outer side of the maintenance opening along the circumferential direction of the maintenance opening. The bottom guard plate has a hollow cavity, and at least one reinforcing member is arranged in the hollow cavity. One end of the reinforcing member is connected with the top wall of the hollow cavity, and the other end of the reinforcing member is connected with the bottom wall of the hollow cavity, so as to divide the hollow cavity into at least two energy absorption cavities. There are at least two reinforcing members, and the reinforcing members are arranged along the length direction of the load-bearing beam. The reinforcing members are arranged along the width direction of the load-bearing beam. 9.A battery pack comprising the battery pack lower case according to any one of claims 1 to 8. 10.A vehicle comprising the battery pack lower case according to any one of claims 1 to 8 or the battery pack according to claim 9.

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