CN221150177U - Battery pack lower box and vehicle - Google Patents

Abstract

The utility model provides a lower box body of a battery pack and a vehicle, wherein the lower box body of the battery pack comprises a lower box body and a reinforcing component, a containing cavity is formed in the lower box body, the reinforcing component is arranged in the containing cavity and comprises a plurality of cross beams extending along the width direction of the lower box body, the cross beams are distributed at intervals in the length direction of the lower box body, at least one cross beam comprises a front reinforcing rib, a rear reinforcing rib and a plurality of connecting ribs, the front reinforcing rib and the rear reinforcing rib are distributed at intervals in the length direction of the lower box body, each connecting rib is connected between the front reinforcing rib and the rear reinforcing rib, and the connecting ribs are distributed at intervals in the width direction of the lower box body. According to the battery pack lower box body, the cross beam is of the structure comprising the front reinforcing ribs, the rear reinforcing ribs and the connecting ribs, so that the structural strength of the battery pack lower box body can be better improved while the light design requirement is met, and the anti-collision performance of the battery pack lower box body is improved.

Description

Battery pack lower box and vehicle

Technical Field

The utility model relates to the technical field of vehicle parts, in particular to a battery pack lower box body. Meanwhile, the utility model also relates to a vehicle using the battery pack lower box body.

Background

The battery pack can be used as a power source of a vehicle to drive the vehicle. Battery packs are very important parts of vehicles, and with the progress and development of technology, performance requirements of people on the battery packs are higher and higher, and particularly performance requirements in terms of light weight and reliability are required.

The prior battery pack generally comprises an upper box body, a lower box body and a battery cell module accommodated between the upper box body and the lower box body. While the current main current battery pack lower case has better structural strength if made of heavier materials, but has heavier overall weight when made of lighter materials, the current main current battery pack lower case has better weight reduction effect, but is difficult to meet the structural reliability requirement.

Disclosure of utility model

In view of the above, the present utility model is directed to a lower case of a battery pack, which has a light structure and good structural strength.

In order to achieve the above purpose, the technical scheme of the utility model is realized as follows:

a battery pack lower box body comprises a lower box body and a reinforcing component;

An accommodating cavity with an open upper part is formed in the lower box body;

The reinforcing component is arranged in the accommodating cavity and comprises a plurality of cross beams extending along the width direction of the lower box body, and the cross beams are distributed at intervals in the length direction of the lower box body; the cross beam of at least one comprises a front reinforcing rib, a rear reinforcing rib and a plurality of connecting ribs; the front reinforcing ribs and the rear reinforcing ribs are arranged at intervals in the length direction of the lower box body, each connecting rib is connected between the front reinforcing ribs and the rear reinforcing ribs, and a plurality of connecting ribs are arranged at intervals in the width direction of the lower box body.

Further, the plurality of cross beams include a front cross beam and a rear cross beam which are arranged at intervals in the length direction of the lower box body, and the reinforcing assembly further includes a longitudinal beam extending in the length direction of the lower box body, and the longitudinal beam is connected between the front cross beam and the rear cross beam.

Further, the reinforcing component further comprises a middle cross beam arranged between the front cross beam and the rear cross beam, the two sides of the longitudinal beam are respectively provided with the middle cross beam, one end of the middle cross beam is connected with the longitudinal beam, and the other end of the middle cross beam is connected with the side wall of the accommodating cavity.

Further, the longitudinal beam and/or the middle cross beam comprise a partition plate, and an upper reinforcing rib unit and a lower reinforcing rib unit which are respectively arranged on the upper side and the lower side of the partition plate;

The lower reinforcing rib unit comprises two outer reinforcing ribs and inner reinforcing ribs, wherein the two outer reinforcing ribs are arranged at intervals in the width direction of the partition board, the inner reinforcing ribs are connected between the two outer reinforcing ribs, each inner reinforcing rib is connected between the two outer reinforcing ribs, and the inner reinforcing ribs are distributed at intervals in the length direction of the partition board.

Further, the upper reinforcing rib unit comprises a reinforcing rib body and a plurality of bulges arranged on the reinforcing rib body; the bulges are distributed at intervals in the length direction of the reinforcing rib body, and adjacent bulges protrude towards two sides of the reinforcing rib body in the thickness direction; or alternatively, the first and second heat exchangers may be,

The upper reinforcing rib unit comprises a reinforcing rib main body extending along the length direction of the partition plate and a plurality of auxiliary reinforcing ribs, wherein the plurality of auxiliary reinforcing ribs are arranged on two sides of the reinforcing rib main body, and the plurality of auxiliary reinforcing ribs on each side are distributed at intervals in the length direction of the partition plate.

Further, the lower box body is provided with an equipotential connection part which is used for being connected with the equipotential of the car body.

Further, the lower box body is provided with a connecting beam positioned on the periphery side of the lower box body, and a vehicle body connecting part connected with a vehicle body is arranged on the connecting beam;

The connecting beam is internally provided with a cavity with an open lower part, a plurality of transverse reinforcing ribs and a plurality of longitudinal reinforcing ribs are arranged in the cavity, the transverse reinforcing ribs extend along the width direction of the lower box body and are distributed at intervals in the length direction of the lower box body, and the longitudinal reinforcing ribs extend along the length direction of the lower box body and are distributed at intervals in the width direction of the lower box body.

Further, the battery pack lower box body further comprises a guard plate, the guard plate is connected to the lower side of the bottom plate of the lower box body, the guard plate is connected with the bottom plate through a connecting piece, and a gap is formed between the guard plate and the bottom plate.

Further, the lower box body and the reinforcing component are integrally formed by adopting a compression molding process, and the lower box body and the reinforcing component are made of fiber composite materials.

Compared with the prior art, the utility model has the following advantages:

According to the battery pack lower box body, the cross beam is of the structure comprising the front reinforcing ribs, the rear reinforcing ribs and the connecting ribs, the adjacent connecting ribs are distributed at intervals, so that the cross beam is lighter in weight, the connecting ribs are connected between the front reinforcing ribs and the rear reinforcing ribs, the structural strength of the cross beam is higher, the lightweight design requirement can be met, and meanwhile, the structural strength of the battery pack lower box body is better improved, and therefore the anti-collision performance of the battery pack lower box body is improved.

In addition, make the crossbeam include front portion crossbeam and rear portion crossbeam to set up the longeron and connect between front portion crossbeam and rear portion crossbeam, and set up the middle part crossbeam, all can further improve the overall structure intensity of box under the battery package.

In addition, the longitudinal beam and/or the middle cross beam comprise a partition plate, an upper reinforcing rib unit and a lower reinforcing rib unit, so that the structural strength of the reinforcing component can be better improved, and the overall structural strength of the lower box body of the battery pack can be improved. The lower reinforcing rib unit comprises an outer reinforcing rib and an inner reinforcing rib, and the upper reinforcing rib unit comprises a reinforcing rib body and a bulge, or the upper reinforcing rib unit comprises a reinforcing rib main body and an auxiliary reinforcing rib, so that the structural strength of the reinforcing component is improved well, and the overall structural strength of the lower box body of the battery pack can be further improved.

Meanwhile, the equipotential connection part is arranged on the lower box body, so that the connection with the vehicle body is convenient, and the safety performance of the battery pack is improved. The cavity of the connecting beam is internally provided with a plurality of transverse reinforcing ribs and a plurality of longitudinal reinforcing ribs, which are beneficial to improving the structural strength of the connecting beam, and the structural strength of the lower box body of the battery pack. The guard board is arranged, and the distance between the guard board and the bottom plate is set, so that the anti-collision performance of the bottom of the lower box of the battery pack is improved.

The lower box body and the reinforcing component are made of fiber composite materials, compared with the existing aluminum alloy materials, the weight of the lower box body and the reinforcing component is lighter, the lower box body and the reinforcing component are integrally formed by adopting a compression molding process, and the processing process is simple and convenient.

Meanwhile, it is still another object of the present utility model to provide a vehicle provided with the battery pack lower case as described above.

The vehicle has the same beneficial effects as the battery pack lower box body in the prior art, and is not repeated here.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. In the drawings:

fig. 1 is a schematic structural view of a lower case of a battery pack according to an embodiment of the present utility model;

fig. 2 is a schematic structural view of a lower case of a battery pack according to an embodiment of the present utility model at another view angle;

FIG. 3 is a schematic view showing a bottom structure of a lower case of a battery pack without a guard plate according to an embodiment of the present utility model;

fig. 4 is an enlarged view of a portion a of fig. 1;

fig. 5 is an enlarged view of a portion B of fig. 1;

fig. 6 is an enlarged view of a portion C of fig. 3;

FIG. 7 is an enlarged view of the portion D of FIG. 3;

Fig. 8 is a top view of a lower case of a battery pack according to an embodiment of the present utility model;

FIG. 9 is a cross-sectional view taken along line E-E of FIG. 8;

Fig. 10 is an enlarged view of the portion F of fig. 9;

FIG. 11 is a cross-sectional view taken along line G-G of FIG. 8;

fig. 12 is an enlarged view of the portion H of fig. 11;

fig. 13 is a partial cross-sectional view of a stringer according to an embodiment of the present utility model.

Reference numerals illustrate:

1. A lower case body; 101. a receiving chamber; 102. a connecting beam; 1021. a vehicle body connection portion; 1022. a cavity; 1023. transverse reinforcing ribs; 1024. longitudinal reinforcing ribs;

2. a reinforcement assembly; 201. a front cross member; 2011. front reinforcing ribs; 2012. a rear reinforcing rib; 2013. a connecting rib; 202. a middle cross beam; 203. a rear cross member; 204. a longitudinal beam; 2041. a partition plate; 2042. an upper reinforcing rib unit; 20421. a reinforcing rib body; 20422. a protrusion; 20423. a reinforcing rib main body; 20424. auxiliary reinforcing ribs; 2043. a lower reinforcing rib unit; 20431. an outer reinforcing rib; 20432. an inner reinforcing rib; 2044. a connection hole;

3. A bottom plate; 4. an equipotential connection part; 5. a guard board; 6. and a connecting piece.

Detailed Description

It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other.

In the description of the present utility model, it should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", "inner", "back", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In addition, in the description of the present utility model, the terms "mounted," "connected," and "connecting" are to be construed broadly, unless otherwise specifically defined. For example, the connection can be fixed connection, detachable connection or integrated connection; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art in combination with specific cases.

In the drawings of the present utility model, the front-rear direction refers to the longitudinal direction of the lower case body, and the left-right direction refers to the width direction of the lower case body.

The utility model will be described in detail below with reference to the drawings in connection with embodiments.

The present embodiment relates to a battery pack lower case, which mainly includes a lower case body 1 and a reinforcing member 2, as shown in fig. 1 to 7, wherein an accommodating chamber 101 having an open upper portion is formed in the lower case body 1, and the reinforcing member 2 is provided in the accommodating chamber 101.

In order to better understand the lower case of the battery pack of the present embodiment, the structure of the lower case body 1 is described first, in this embodiment, the accommodating cavity 101 of the lower case body 1 is substantially quadrangular, the bottom of the accommodating cavity 101 is provided with a bottom plate 3, the periphery of the bottom plate 3 is provided with side plates, and each side plate and the bottom plate 3 jointly enclose the accommodating cavity 101 of the present embodiment.

As a preferred embodiment, the reinforcement assembly 2 includes a plurality of cross members extending in the width direction of the lower case body 1, the plurality of cross members being arranged at intervals in the length direction of the lower case body 1. As shown in fig. 1 to 3, in the present embodiment, the plurality of cross members includes a front cross member 201 and a rear cross member 203 arranged at a distance in the longitudinal direction of the lower case body 1, and the front cross member 201 and the rear cross member 203 each extend in the width direction of the lower case body 1.

Preferably, as shown in fig. 1 and 4, the front beam 201 and the rear beam 203 each include a front stiffener 2011, a rear stiffener 2012, and a plurality of connection ribs 2013, the front stiffener 2011 and the rear stiffener 2012 each extend along the width direction of the lower case body 1, and are arranged at intervals in the length direction of the lower case body 1, each connection rib 2013 is connected between the front stiffener 2011 and the rear stiffener 2012, and the plurality of connection ribs 2013 are arranged at intervals in the width direction of the lower case body 1.

Preferably, the front stiffener 2011, the rear stiffener 2012 and the connecting ribs 2013 all adopt plate structures, the front stiffener 2011 and the rear stiffener 2012 are parallel, the front stiffener 2011, the rear stiffener 2012 and the connecting ribs 2013 are perpendicular to the bottom plate 3, the connecting ribs 2013 are perpendicular to the front stiffener 2011, and the connecting ribs 2013 are perpendicular to the rear stiffener 2012, so that the structural strength of the reinforcing component 2 can be improved better.

Here, it should be noted that, in addition to the front stiffener 2011, the rear stiffener 2012, and the plurality of connection ribs 2013, the front stiffener 201 and the rear stiffener 203 may be configured to include only the front stiffener 2011, the rear stiffener 2012, and the plurality of connection ribs 2013, or only the rear stiffener 203 may be configured to include the front stiffener 2011, the rear stiffener 2012, and the plurality of connection ribs 2013.

As a preferred embodiment, still referring to fig. 1 and 2, the reinforcement assembly 2 further includes a longitudinal beam 204 extending along the length direction of the lower case body 1, and the longitudinal beam 204 extends along the length direction of the lower case body 1 and is connected between the front cross member 201 and the rear cross member 203, so that the structural strength of the reinforcement assembly 2 can be further improved.

As a preferred embodiment, the reinforcement assembly 2 further includes a middle cross member 202 disposed between the front cross member 201 and the rear cross member 203, the middle cross members 202 are disposed on both sides of the longitudinal member 204, the middle cross members 202 on both sides extend along the width direction of the lower case body 1, and one end of the middle cross member 202 is connected to the longitudinal member 204, and the other end is connected to the side wall of the accommodating chamber 101.

It should be noted that, the cross member includes the front cross member 201 and the rear cross member 203, and the longitudinal member 204 is connected between the front cross member 201 and the rear cross member 203, and the middle cross member 202 is provided, so that the structural strength of the reinforcement assembly can be improved, and the overall structural strength of the lower case of the battery pack can be further improved.

In a preferred embodiment, as shown in fig. 1, 5 and 13, the longitudinal beam 204 and the middle cross beam 202 include a partition 2041, and an upper stiffener unit 2042 and a lower stiffener unit 2043 respectively disposed on the upper and lower sides of the partition 2041, so as to better improve the structural strength of the longitudinal beam 204 and the middle cross beam 202, so that the structural strength of the reinforcing component 2 itself can be better improved, and the overall structural strength of the lower case of the battery pack can be improved.

It should be noted here that, in the above configuration, it is also possible to make only the side members 204 include the partition 2041, the upper bead unit 2042, and the lower bead unit 2043, or to make only the middle cross member 202 include the partition 2041, the upper bead unit 2042, and the lower bead unit 2043.

In a preferred embodiment, as shown in fig. 3, 7 and 13, the partition 2041 is parallel to the bottom wall of the accommodation chamber 101, and the lower bead units 2043 of the side members 204 and the middle cross member 202 each include two outer beads 20431 arranged at a distance in the width direction of the partition 2041, and an inner bead 20432 connected between the two outer beads 20431.

The two outer reinforcing ribs 20431 of the longitudinal beam 204 extend along the length direction of the lower box body 1 (the length direction of the partition plate 2041 of the longitudinal beam 204), the two outer reinforcing ribs 20431 of the middle cross beam 202 extend along the width direction of the lower box body 1 (the length direction of the partition plate 2041 of the middle cross beam 202), each inner reinforcing rib 20432 is connected between the two outer reinforcing ribs 20431, a plurality of inner reinforcing ribs 20432 are distributed at intervals in the length direction of the partition plate 2041, namely, a plurality of inner reinforcing ribs 20432 of the longitudinal beam 204 are distributed at intervals in the length direction of the lower box body 1, and a plurality of inner reinforcing ribs 20432 of the middle cross beam 202 are distributed at intervals in the width direction of the lower box body 1.

Preferably, the two outer reinforcing ribs 20431 and the inner reinforcing ribs 20432 are both plate bodies, the two outer reinforcing ribs 20431 are parallel to each other, the two outer reinforcing ribs 20431 and the two inner reinforcing ribs 20432 are perpendicular to the bottom plate 3, and the bottom plate 3 is perpendicular to the two outer reinforcing ribs 20431 respectively, so that the structural strength of the longitudinal beam 204 and the middle transverse beam 202 is improved better.

Preferably, as shown in fig. 1 and 5, the upper stiffener unit 2042 of the middle beam 202 includes a stiffener body 20421, and a plurality of protrusions 20422 provided on the stiffener body 20421, the plurality of protrusions 20422 being arranged at intervals in the length direction of the stiffener body 20421, and adjacent protrusions 20422 protruding toward both sides in the thickness direction of the stiffener body 20421.

Still referring to fig. 1 and 5, the upper stiffener unit 2042 of the longitudinal beam 204 includes a stiffener body 20423 extending along the length direction of the bulkhead 2041 and a plurality of auxiliary stiffeners 20424, wherein the plurality of auxiliary stiffeners 20424 are disposed on both sides of the stiffener body 20423, and the plurality of auxiliary stiffeners 20424 on each side are arranged at intervals in the length direction of the bulkhead 2041. In this structure, the rib main body 20423 and each auxiliary rib 20424 are preferably formed in a plate-like structure perpendicular to the bottom plate 3.

It should be noted that, in the above structure, the structures of the upper stiffener units 2042 of the longitudinal beams 204 and the middle cross members 202 may be different from each other, and in addition, the structures of the upper stiffener units 2042 of the longitudinal beams 204 and the middle cross members 202 may be the same, or the structures of the upper stiffener units 2042 of the longitudinal beams 204 and the middle cross members 202 may be interchanged.

In addition, in the above structure, the lower stiffener unit 2043 includes the outer stiffener 20431 and the inner stiffener 20432, and the upper stiffener unit 2042 includes the stiffener body 20421 and the protrusion 20422, or the upper stiffener unit 2042 includes the stiffener body 20423 and the auxiliary stiffener 20424, both for better improving the structural strength of the stiffener assembly 2.

As a preferred embodiment, as shown in fig. 1, 2 and 8, the lower case body 1 is provided with an equipotential connection part 4 for equipotential connection with a vehicle body, which is convenient to connect with the vehicle body and is advantageous in improving the safety performance of the battery pack.

The equipotential connection part 4 of the present embodiment is made of aluminum foil, and is preferably attached to the outer side of the lower case body 1 by means of adhesion. Still referring to fig. 1 and 2, the equipotential connection parts 4 are provided at the left, right and rear sides of the lower case body 1, and in addition, the shape and the installation position of the equipotential connection parts 4 may be adjusted according to the actual vehicle type, for example, it is also possible to provide the equipotential connection parts 4 only at the left and right sides of the lower case body 1.

Referring to fig. 1, 2, 3, 6 and 8, the lower case body 1 includes a connection beam 102 located on the peripheral side thereof, and a vehicle body connection portion 1021 connected to the vehicle body is provided on the connection beam 102. Preferably, the connecting beam 102 is internally provided with a cavity 1022 with an open lower part, the cavity 1022 is internally provided with a plurality of transverse reinforcing ribs 1023 and a plurality of longitudinal reinforcing ribs 1024, the transverse reinforcing ribs 1023 extend along the width direction of the lower box body 1 and are distributed at intervals in the length direction of the lower box body 1, and the longitudinal reinforcing ribs 1024 extend along the length direction of the lower box body 1 and are distributed at intervals in the width direction of the lower box body 1.

In the above structure, the plurality of transverse reinforcing ribs 1023 and the plurality of longitudinal reinforcing ribs 1024 are arranged in the cavity 1022 of the connecting beam 102, which is favorable for improving the structural strength of the connecting beam 102, and is favorable for improving the structural strength of the lower box of the battery pack.

As shown in fig. 8 to 12, the lower case of the battery pack further includes a sheathing plate 5, the sheathing plate 5 is coupled to the lower side of the bottom plate 3 of the lower case body 1, the sheathing plate 5 and the bottom plate 3 are coupled by a coupling member 6, and a gap is provided between the sheathing plate 5 and the bottom plate 3. The guard plate 5 is arranged, and the guard plate 5 and the bottom plate 3 are arranged at intervals, so that the anti-collision performance of the bottom of the lower box body of the battery pack is improved.

Specifically, referring to fig. 3 and 7, a plurality of connection holes 2044 are formed at the bottoms of the middle cross member 202 and the longitudinal beam 204, the plurality of connection holes 2044 on the middle cross member 202 are arranged at intervals along the width direction of the lower box body 1, the plurality of connection holes 2044 on the longitudinal beam 204 are arranged at intervals along the length direction of the lower box body 1, through holes corresponding to the connection holes 2044 one by one are formed on the guard plate 5, and the connection pieces 6 correspond to the connection holes 2044 one by one so as to be respectively inserted into the corresponding through holes and the connection holes 2044, and the connection pieces 6 can be made of existing bolts, screws, and the like.

Finally, it should be noted that in this embodiment, the lower case body 1 and the reinforcing component 2 are preferably molded integrally by a compression molding process, and the material may be a fiber composite material, for example, a mixture of fibers and resin. Wherein the fiber can be glass fiber, basalt fiber or carbon fiber, and the resin can be thermoplastic or thermosetting resin.

In a preferred embodiment, the lower box body 1, the reinforcing members and the connection beams 102 are preferably made of a mixture of short glass fibers and resin, which can be reinforced by adding prepreg tapes of continuous fibers where reinforcement is locally required. The bottom plate 3 may be metal or a plate body formed by hot press molding a prepreg tape of continuous fibers, and the bottom plate 3 is pre-buried in a mold when the box body 1, the reinforcing members, and the connection beams 102 are molded. The protection plate 109 may be made of the same material as the bottom plate 3 to improve the impact resistance of the bottom of the lower case.

The lower box of the battery pack of the embodiment is provided with the structure comprising the front reinforcing ribs 2011, the rear reinforcing ribs 2012 and the connecting ribs 2013 by arranging the cross beams at intervals between the adjacent connecting ribs 2013, and each connecting rib 2013 is connected between the front reinforcing rib 2011 and the rear reinforcing rib 2012, so that the structural strength of the lower box of the battery pack can be better improved while the light design requirement is met, and the anti-collision performance of the lower box of the battery pack is improved.

In addition, the present embodiment also relates to a vehicle provided with the battery pack lower case as described above. Specifically, the battery pack lower case as described above is applied to a battery pack, and the battery pack is mounted on a vehicle body.

The battery pack may include, for example, a battery pack case assembly, and a battery cell module disposed in the battery pack case assembly. The battery pack box assembly comprises the battery pack lower box and the battery pack upper box connected with the battery pack lower box, and the structure diagram of the battery pack upper box is not shown. The upper box body of the battery pack is blocked at the upper opening of the lower box body 1, so that a complete battery pack box body assembly can be formed, the existing battery cell module is installed in the accommodating cavity 101 of the lower box body 1, and then the battery pack can be manufactured and installed on a vehicle body and can be used for driving the vehicle to run.

The vehicle of the embodiment has the same beneficial effects as the battery pack lower case described above with respect to the prior art, and will not be described in detail herein.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.

Claims (9)

1. The utility model provides a box under battery package which characterized in that:

comprises a lower box body (1) and a reinforcing component (2);

a containing cavity (101) with an open upper part is formed in the lower box body (1);

The reinforcing component (2) is arranged in the accommodating cavity (101) and comprises a plurality of cross beams extending along the width direction of the lower box body (1), and the cross beams are distributed at intervals in the length direction of the lower box body (1); the cross beam of at least one comprises a front stiffener (2011), a rear stiffener (2012) and a plurality of connecting stiffeners (2013); the front reinforcing ribs (2011) and the rear reinforcing ribs (2012) are arranged at intervals in the length direction of the lower box body (1), each connecting rib (2013) is connected between the front reinforcing rib (2011) and the rear reinforcing rib (2012), and a plurality of connecting ribs (2013) are arranged at intervals in the width direction of the lower box body (1);

The lower box body (1) and the reinforcing component (2) are integrally formed by adopting a compression molding process;

The lower box body (1) and the reinforcing component (2) are made of fiber composite materials.

2. The battery pack lower case according to claim 1, wherein:

The plurality of cross beams comprise a front cross beam (201) and a rear cross beam (203) which are arranged at intervals in the length direction of the lower box body (1), the reinforcing assembly (2) further comprises a longitudinal beam (204) which extends in the length direction of the lower box body (1), and the longitudinal beam (204) is connected between the front cross beam (201) and the rear cross beam (203).

3. The battery pack lower case according to claim 2, wherein:

The reinforcing component (2) further comprises a middle cross beam (202) arranged between the front cross beam (201) and the rear cross beam (203), the middle cross beams (202) are arranged on two sides of the longitudinal beam (204), one end of the middle cross beam (202) is connected with the longitudinal beam (204), and the other end of the middle cross beam is connected with the side wall of the accommodating cavity (101).

4. A battery pack lower case according to claim 3, wherein:

The longitudinal beam (204) and/or the middle cross beam (202) comprises a partition plate (2041), and an upper reinforcing rib unit (2042) and a lower reinforcing rib unit (2043) which are respectively arranged on the upper side and the lower side of the partition plate (2041);

The lower reinforcing rib unit (2043) comprises two outer reinforcing ribs (20431) which are arranged at intervals in the width direction of the partition board (2041), and inner reinforcing ribs (20432) which are connected between the two outer reinforcing ribs (20431), wherein each inner reinforcing rib (20432) is connected between the two outer reinforcing ribs (20431), and a plurality of inner reinforcing ribs (20432) are distributed at intervals in the length direction of the partition board (2041).

5. The battery pack lower case according to claim 4, wherein:

The upper reinforcing rib unit (2042) comprises a reinforcing rib body (20421) and a plurality of bulges (20422) arranged on the reinforcing rib body (20421); the bulges (20422) are distributed at intervals in the length direction of the reinforcing rib body (20421), and adjacent bulges (20422) protrude towards two sides of the reinforcing rib body (20421) in the thickness direction; or alternatively, the first and second heat exchangers may be,

The upper reinforcing rib unit (2042) comprises a reinforcing rib main body (20423) extending along the length direction of the partition board (2041) and a plurality of auxiliary reinforcing ribs (20424), wherein a plurality of auxiliary reinforcing ribs (20424) are arranged on two sides of the reinforcing rib main body (20423), and the auxiliary reinforcing ribs (20424) on each side are distributed at intervals in the length direction of the partition board (2041).

6. The battery pack lower case according to claim 1, wherein:

The lower box body (1) is provided with an equipotential connection part (4) for equipotential connection with a vehicle body.

7. The battery pack lower case according to claim 1, wherein:

The lower box body (1) is provided with a connecting beam (102) positioned on the periphery side of the lower box body, and a vehicle body connecting part (1021) connected with a vehicle body is arranged on the connecting beam (102);

The connecting beam (102) is internally provided with a cavity (1022) with an opening at the lower part, the cavity (1022) is internally provided with a plurality of transverse reinforcing ribs (1023) and a plurality of longitudinal reinforcing ribs (1024), the transverse reinforcing ribs (1023) extend along the width direction of the lower box body (1) and are distributed at intervals in the length direction of the lower box body (1), and the longitudinal reinforcing ribs (1024) extend along the length direction of the lower box body (1) and are distributed at intervals in the width direction of the lower box body (1).

8. The battery pack lower case according to claim 1, wherein:

The battery pack lower box body further comprises a guard plate (5), the guard plate (5) is connected to the lower side of the bottom plate (3) of the lower box body (1), the guard plate (5) is connected with the bottom plate (3) through a connecting piece (6), and a gap is formed between the guard plate (5) and the bottom plate (3).

9. A vehicle, characterized in that:

The vehicle is provided with the battery pack lower case according to any one of claims 1 to 8.