CN214647604U

CN214647604U - Protective structure and vehicle of battery package

Info

Publication number: CN214647604U
Application number: CN202022823381.7U
Authority: CN
Inventors: 李华; 郭军; 徐超
Original assignee: Beijing CHJ Automobile Technology Co Ltd
Current assignee: Beijing CHJ Automobile Technology Co Ltd
Priority date: 2020-11-30
Filing date: 2020-11-30
Publication date: 2021-11-09
Anticipated expiration: 2030-11-30

Abstract

The present disclosure relates to the field of automotive battery technology, and in particular, to a protective structure for a battery pack and a vehicle. The protective structure of the battery pack comprises a battery box body, a bottom protective plate and a bottom protective plate pressing strip, wherein the bottom protective plate is arranged at the bottom of the battery box body; the bottom guard plate pressing strip is connected with the battery box body through the second fastening piece, and the bottom guard plate pressing strip is pressed on the bottom guard plate at one side of the bottom guard plate, which is far away from the battery box body. Even if the fixed effect of first fastener is lost efficacy, can also utilize the effect of end backplate layering, compress tightly end backplate on the diapire of battery box, improved the safety protection and the sealed grade of battery box, reduced the sealed risk of losing efficacy of end backplate, improve product sealing reliability and security performance.

Description

Protective structure and vehicle of battery package

Technical Field

The present disclosure relates to the field of automotive battery technology, and in particular, to a protective structure for a battery pack and a vehicle.

Background

With the development of electric vehicle technology, the power battery pack pursues higher grouping efficiency and safer structural requirements, and in the mainstream design scheme, the importance degree on bottom safety is higher and higher.

At present, regarding the design of bottom safety and a bottom protection plate, a common scheme is that a stamping bottom protection plate is additionally arranged at the bottom of a battery pack, a detachable battery pack bottom protection plate is fixed at the bottom of the battery pack by adopting a circle of screws, and because more fixing point screws are exposed outside and additional protection is not added, and in addition, the use environment of the bottom of the battery pack is severe, when the bottom of the battery pack is impacted, the bottom fixing point is easy to lose efficacy or the bottom protection plate is pierced, so that sealing failure is caused; even the bottom guard plate has poor rigidity, and after the bottom guard plate is deformed by external force, the external force directly invades the liquid cooling plate, the battery cell and other subsystems to cause the deformation of other subsystems. In a word, no matter the water enters the battery pack due to the sealing failure or the subsystem fails due to the intrusion of external force, the accidents of short circuit, fire, explosion and the like of the power battery pack can be caused; that is to say that the backplate scheme plays limited guard action to bottom safety protection at present commonly used punching press, and factor of safety is low.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem or at least partially solve the technical problem, the present disclosure provides a protective structure of a battery pack and a vehicle.

The invention provides a protective structure of a battery pack, which comprises a battery box body, a bottom protective plate and a bottom protective plate pressing strip, wherein the bottom protective plate is arranged at the bottom of the battery box body; the bottom guard plate pressing strip is connected with the battery box body through the second fastening piece, and the bottom guard plate pressing strip is pressed on the bottom guard plate at one side of the bottom guard plate, which is far away from the battery box body.

Optionally, the bottom guard plate pressing strip comprises a connecting plate and a pressing plate which are connected with each other, the connecting plate is fixedly connected with the side wall of the battery box body through the second fastening piece, and the pressing plate is located on one side, far away from the battery box body, of the bottom guard plate and is attached to and pressed on the bottom guard plate.

Optionally, a first connecting hole used for connecting the first fastener is formed in the bottom protective plate, and an avoiding hole is formed in a position, corresponding to the first connecting hole, of the pressing plate.

Optionally, one end of the connecting plate, which is far away from the pressing plate, is provided with a plurality of connecting lugs at intervals, each connecting lug is provided with a second connecting hole for connecting with the second fastening piece, and the end of each connecting lug obliquely extends in the direction far away from the pressing plate to form a guide part.

Optionally, the extension line of the second fastener does not intersect with the extension line of the first fastener in space.

Optionally, the connection position of the connecting plate and the pressing strip is arched outwards to form a buffer cavity.

Optionally, the battery box further comprises a reinforcing beam, and the reinforcing beam is fixedly attached to one side, away from the battery box body, of the bottom guard plate.

Optionally, the two ends of the stiffening beam extend to two sides along the width direction to form connecting pieces, third connecting holes used for being connected with the first fastening pieces are formed in the connecting pieces, and at the position where the stiffening beam is arranged, the first fastening pieces sequentially penetrate through the third connecting holes and the first connecting holes and then are fixedly connected with the battery box body, so that the stiffening beam and the bottom protective plate are fixed on the battery box body.

Optionally, the pressing plate corresponding to the two ends of the stiffening beam is provided with an avoidance groove for avoiding the connecting sheet, and the avoidance groove is formed from the end part of the pressing plate, which is far away from one end of the connecting plate, to the direction close to the connecting plate.

The present disclosure also provides a vehicle including the protective structure of the battery pack according to any one of the above aspects.

Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages:

the protection structure of battery package that this disclosed embodiment provided sets up end backplate and end backplate layering on the diapire of battery box, wherein is equipped with the sealing strip between end backplate and the battery box, and end backplate is fixed on the diapire of battery box through the first fastener that sets up along sealing strip outside circumference, and end backplate layering passes through the second fastener and is connected with the battery box, and end backplate layering compresses tightly on end backplate at one side that the battery box was kept away from to the backplate at the end. Therefore, even if the fixing effect of the first fastener positioned at the bottom of the battery box body fails, the bottom guard plate can be tightly pressed on the bottom wall of the battery box body by utilizing the action of the bottom guard plate pressing strip, so that the safety protection and the sealing grade of the battery box body are improved, the risk of sealing failure of the bottom guard plate is reduced, and the sealing reliability and the safety performance of a product are improved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.

In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present disclosure, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.

Fig. 1 is an exploded view of a protective structure of a battery pack according to an embodiment of the present disclosure;

FIG. 2 is a schematic structural view of the fender body according to an embodiment of the disclosure;

FIG. 3 is a cross-sectional view of the fender body and the battery case of the embodiment of the disclosure, without the reinforcing beam;

FIG. 4 is a cross-sectional view of the fender body and the battery box body at the position where the reinforcing beam is arranged according to the embodiment of the disclosure;

FIG. 5 is a schematic structural view of a bottom guard plate bead according to an embodiment of the disclosure;

FIG. 6 is a cross-sectional view of FIG. 5;

FIG. 7 is a schematic view of another embodiment of the disclosure showing a structure of a batten of a bottom guard plate;

fig. 8 is a schematic structural view of a reinforcing beam according to an embodiment of the present disclosure. Wherein, 1, a battery box body; 2. a sealing strip; 3. a second fastener; 4. a bottom guard plate main body; 5. a first fastener; 6. pulling and riveting the nut; 7. pulling and riveting the nut; 41. a bottom guard plate; 42. pressing strips for the bottom guard plate; 43. a reinforcing beam; 421. a connecting plate; 422. pressing a plate; 421a, connecting lugs; 421b, a second connecting hole; 422a and a protective cavity; 422b and the inner side wall of the pressing plate; 422c, avoiding holes; 423. a buffer chamber; 422d, avoiding the groove; 431. connecting sheets; 431a, a third connecting hole; 432. lightening holes; 433. and (7) welding the surfaces.

Detailed Description

In order that the above objects, features and advantages of the present disclosure may be more clearly understood, aspects of the present disclosure will be further described below. It should be noted that the embodiments and features of the embodiments of the present disclosure may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced in other ways than those described herein; it is to be understood that the embodiments disclosed in the specification are only a few embodiments of the present disclosure, and not all embodiments.

As shown in fig. 1 to 8, the embodiment of the present disclosure provides a protection structure of a battery pack, which includes a battery box 1 and a bottom protection plate main body 4, the bottom protection plate main body 4 includes a bottom protection plate 41 and a bottom protection plate bead 42, the bottom protection plate 41 is disposed at the bottom of the battery box 1, a sealing strip 2 is disposed between the bottom protection plate 41 and the bottom wall of the battery box 1, a sealing effect between the bottom protection plate 41 and the bottom wall of the battery box 1 is achieved, and a risk of water entering between the bottom protection plate 41 and the bottom wall of the battery box 1 is reduced, the bottom protection plate 41 is fixed on the bottom wall of the battery box 1 by a circle of first fastening members 5 disposed around an outer side of the sealing strip 2, the shape of the sealing strip 2 is a closed rectangular ring, where the outer side of the sealing strip 2 is defined by referring to a center of the sealing strip 2, the side opposite to the center of the sealing tape 2 is the inner side of the sealing tape 2, and the side departing from the center of the sealing tape 2 is the outer side of the sealing tape 2. The sealing strip 2 can be fixed in various ways, and can be adhered to the bottom wall of the battery box body 1, or the sealing strip 1 foamed on line is coated on the sealing area of the upper surface of the bottom protection plate 41. It should be noted that the sealing strip 2 is a structural component having a sealing function, and is not limited to foamed silica gel or an online foamed product, but may also be silicone rubber or a sealant; the connection mode of the bottom protection plate 41 and the battery box body 1 is not limited to the fixation through the first fastening piece 5, and the processes of welding, riveting, gluing, FDS, high-speed punching and riveting and the like can also be adopted. The bottom guard plate batten 42 is connected with the battery box body 1 through the second fastening piece 3, and the bottom guard plate batten 42 is pressed on the bottom guard plate 41 on one side of the bottom guard plate 41 far away from the battery box body 1. Therefore, even if the fixing effect of the first fastening piece 5 positioned at the bottom of the battery box body 1 fails, the bottom guard plate 41 can be pressed on the bottom wall of the battery box body 1 by utilizing the action of the bottom guard plate pressing strip 42, so that the safety protection and the sealing grade of the battery box body are improved, the risk of sealing failure of the bottom guard plate is reduced, and the sealing reliability and the safety performance of a product are improved.

Specifically, the bottom guard plate batten 42 has various forms, the bottom guard plate batten 42 may be a flat plate type or an L-type, when the bottom guard plate batten 42 is a flat plate type, one side of the bottom guard plate batten 24 is connected with the bottom wall of the battery box 1 through the second fastening piece 3, and the other side is tightly pressed on the bottom guard plate 41 and is arranged corresponding to the sealing strip 2; in some embodiments of the present disclosure, as described in conjunction with fig. 2 to fig. 7, the shape of the backplate bead 42 is an L-shape, specifically, the backplate bead 42 includes a connecting plate 421 and a bead 422 that are connected to each other, where the connecting plate 421 is attached to the side wall of the battery box 1 and is fixedly connected by the second fastening member 3, and the pressure plate 422 is located on the side of the backplate 41 away from the battery box 1 and is attached to and pressed against the backplate 41. The bottom guard plate pressing strip 42 is designed to be a thin sheet made of plastic or metal, and has a certain deformation under the action of external force, so that the pressing plate 422 can be pressed on the bottom guard plate 41 to achieve the effect of secondary fixing of the bottom guard plate 41.

The quantity of end backplate layering 42 can be designed as a plurality ofly, and a plurality of end backplate 42 layering end to end sets up around end backplate 41, or a plurality of end backplate layering 42 intervals set up and form the enclosure frame structure around backplate body 41 to at the edge of end backplate 41, carry out the secondary to end backplate 41 and fix. Meanwhile, the sealing strip 2 between the bottom protection plate 41 and the battery box body 1 is compressed again, and the sealing protection effect is improved.

Specifically, as shown in fig. 3 and 5, each bottom protection plate 41 is provided with a first connection hole for connecting with the first fastening member 5, and the pressing plate 422 is provided with an avoiding hole 422c at a position corresponding to the first connection hole, wherein the first connection hole is a light hole, the diameter of the first connection hole is equal to or slightly larger than the diameter of the first fastening member 5, and the diameter of the avoiding hole 422c is larger than the diameter of the first fastening member 5. In some embodiments of the present disclosure, the first fastening member 5 is a screw, a rivet nut 6 in threaded fit with the screw is disposed on the bottom wall of the battery case 1, and the screw passes through the first connecting hole from the avoiding hole to be connected with the rivet nut 6 on the bottom wall of the battery case 1, so that the nut of the screw is pressed on the bottom protection plate 41 around the first connecting hole, the diameter of the avoiding hole 422c is greater than that of the screw, and the screw is prevented from interfering with the bottom protection plate pressing plate 422. The inside wall 422b of the pressing plate 422 is attached to the bottom protection plate 41 and welded and fixed to the bottom protection plate 41, the pressing plate 422 is punched outwards around the avoiding hole 422c, so that an accommodating cavity 422a used for hiding the first fastening piece 5 is formed outside the pressing plate, the accommodating cavity 422a outside the pressing plate plays a role in protecting the first fastening piece 5, under the condition that abrasion is likely to occur, the pressing plate is abraded firstly instead of directly abrading the first fastening piece 5, and the situation that the first fastening piece 5 collides with other structures due to friction when being installed is avoided, and the safety and the stability of the bottom protection plate are affected.

In order to facilitate the connection between the backplate bead 422 and the sidewall of the battery case 1, a connecting lug 421a is provided on the side of the connecting plate 421 away from the pressing plate 41, as shown in fig. 5 to 7, the connecting lug 421a is formed on the upper side of the connecting plate 421, and a plurality of connecting lugs 421a are arranged along the length direction of the connecting plate 421 at intervals, each connecting lug 421a is provided with a second connecting hole 421b, the diameter of the second connecting hole 421b is matched with the diameter of the second fastening piece 3, in some embodiments of the present disclosure, the second fastening member 3 is a screw, a rivet nut 7 for screw-fitting with the screw is disposed on a side wall of the battery case 1, the second fastening member 3 passes through the second connection hole 421b to be connected to the rivet nut 7 on the side wall of the battery case 1, and a nut of the second fastening member 3 presses the connection plate 421 around the second connection hole 421b to fixedly connect the connection plate 421 to the side wall of the battery case 1.

It should be noted that the extension lines of the first fastening members 5 and the extension lines of the second fastening members 3 do not intersect in space, and the first fastening members 5 and the second fastening members 3 are arranged in a staggered manner along the circumferential direction of the battery case 1. The first fastening piece 5 and the second fastening piece 3 only have a sequential relation in the assembling process, and only after all the first fastening pieces 5 are installed firstly, the second fastening piece 3 can be installed, once the installation is completed, the first fastening piece 5 and the second fastening piece 3 do not interfere with each other, and the fixing effect on the bottom guard plate 41 and the bottom guard plate pressing strip 42 is realized independently, so that after a certain first fastening piece 5 is failed by impact, the second fastening piece 3 nearby still can play a fixing effect, the compression amount of the sealing strip 2 at the position is ensured to meet the requirement, and the problem of sealing failure is avoided.

Furthermore, the sealing safety of the bottom of the battery box body 1 can be improved by increasing the width of the sealing strip 3 and the double-ring sealing strip 3, and by the sealing mode, the protection structure in the embodiment of the disclosure can still meet the IP67 sealing protection of the bottom protection plate when the first fastening piece 5 fails.

In addition, as described with reference to fig. 6, in order to facilitate the corresponding assembly of the bottom protective plate bead 42 with the battery box 1 and the bottom protective plate 41, the end of the connecting support lug 421a extends obliquely in a direction away from the pressure plate 422 to form a guide portion 421c, when the bottom protective plate bead 42 is mounted, the battery box 1 is sent into the mounting space defined by the connecting plate 421 and the pressure plate 422 together along the direction of the guide portion 421c, so that the assembly difficulty is reduced, after the mounting is completed, the connecting plate 421 is attached to the side wall of the battery box 1 and fixed by the second fastening member 3, the pressure plate 422 is attached to and pressed against the bottom protective plate 41, and the guide portion 421c is in contact with the side wall of the battery box 1.

Furthermore, because the battery box body 1 has tolerance in the assembling process, and partial tolerance value reaches about +/-2 mm, the buffer cavity 423 is formed in the corner where the pressing plate 422 is connected with the connecting plate 421 by punching to the outside, and the buffer cavity 423 is formed at the bending position of the bottom protection plate pressing strip 42, so as to absorb the assembling tolerance and better enable the connecting plate 421 to be attached to the side wall of the battery box body 1.

In addition, in order to enhance the protection strength of the backplate main body 4, in some embodiments of the present disclosure, a plurality of reinforcing beams 43 are provided on the side of the backplate 41 away from the bottom wall of the battery case 1, and the reinforcing beams 43 are welded to the backplate 41 by resistance spot welding.

Specifically, the two ends of the reinforcing beam 43 extend to two sides along the width direction to form connecting sheets 4431, the connecting sheets 431 are provided with third connecting holes 431a for connecting with the first fasteners 5, and at the position where the reinforcing beam 43 is arranged, the first fasteners 5 sequentially pass through the third connecting holes 431a and the first connecting holes and then are fixedly connected with the bottom wall of the battery box body 1, so that the reinforcing beam 43 and the protective plate 41 are fixed on the bottom wall of the battery box body 1; in the position where the reinforcing beam 43 is not provided, the first fastening member 5 is directly inserted through the first connection hole and then fixedly connected to the bottom wall of the battery case 1. As shown in fig. 7, the pressing plate 422 disposed corresponding to the two ends of the reinforcing beam 43 is provided with an avoiding groove 422d for avoiding the connecting sheet, the avoiding groove 422d is disposed from the end of the pressing plate 422 at the end far from the connecting plate 421 to the direction close to the connecting plate 421, and the avoiding groove 422d penetrates the pressing plate 422 in the thickness direction of the pressing plate 422, specifically, the pressing plate 422 is provided with two avoiding grooves 422d at the corresponding positions to the reinforcing beam 43 to form an "E" shape, that is, the remaining section between the two avoiding grooves 422d is pressed on the reinforcing beam 43, and the two avoiding grooves 422d are respectively used for avoiding the first fastening pieces 5 at the two connecting sheets 431 and the third connecting hole 431 a.

Furthermore, sawtooth-shaped welding surfaces 433 are arranged on two opposite sides of the reinforcing beam 43 along the length direction so as to realize the welding fixation of the reinforcing beam 43 and the bottom protection plate 41, and a lightening hole 432 is formed in the middle of the reinforcing beam 43 so as to lighten the weight of the reinforcing beam 43.

In the production process, the bottom guard plate 41, the bottom guard plate batten 42 and the reinforcing beam 43 are connected into a whole in a resistance spot welding mode, the bottom guard plate 41 is a stamping part, the outer surface of the bottom guard plate is provided with a skin, only the first connecting hole is formed in the fixed position of the edge, and the reinforcing beam 43 provides rigidity support for the bottom guard plate 41, so that the large-area rigidity is improved, and the product has a high mode; the bottom guard plate batten 42 is arranged around the bottom guard plate 41 for a circle, and the pressing width of the pressing plate 422 is not smaller than the width of the inner sealing strip 2, that is, the end part of the pressing plate 422 is positioned on the inner side of the sealing strip 2 in the vertical direction, so that the structural rigidity of the product at the direct contact position of the first fastening piece 5, the second fastening piece 3 and the sealing strip 2 is improved.

Further, in some embodiments of the present disclosure, a vehicle is further provided, where the protective structure of the battery pack in any of the above embodiments is included, and when the battery pack is installed, structural members that absorb energy and buffer foam, a foam structure, and the like are filled between the bottom protective plate main body 4 and the electric core and the cooling plate, so as to further improve the bottom safety factor of the battery system of the system.

To sum up, the protection structure of the battery pack provided by the embodiment of the disclosure realizes the bottom protection of the battery box by arranging the bottom protection plate at the bottom of the battery box and arranging the sealing strip between the bottom protection plate and the bottom wall of the battery box, the bottom protection plate is fixedly connected with the bottom wall of the battery box through a circle of first fastening piece, in order to avoid the influence on the bottom protection effect of the battery box after the first fastening piece fails, the protection structure of the battery pack further comprises a bottom protection plate pressing strip, the cross section of the bottom protection plate pressing strip is in an L shape, the bottom protection plate is arranged at the corner of the bottom of the battery box, wherein a connecting plate of the bottom protection plate pressing strip is fixedly connected with the side wall of the battery box through a second fastening piece, a pressing plate of the bottom protection plate pressing strip is attached and pressed on the bottom protection plate, and plays a secondary fixing effect on the bottom protection plate, so that even if the first fastening piece fails, the bottom protection plate can still play a certain fixing effect on the bottom protection plate, the protective effect is improved, in addition, the reinforcing beam is arranged on the outer side of the bottom protective plate, the rigidity of the bottom protective plate is improved, the stress of the bottom protective plate can be directly transmitted to the box body frame, and the mechanical property is better.

It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The foregoing are merely exemplary embodiments of the present disclosure, which enable those skilled in the art to understand or practice the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The protection structure of the battery pack is characterized by comprising a battery box body (1) and a bottom protection plate main body (4), wherein the bottom protection plate main body (4) comprises a bottom protection plate (41) and a bottom protection plate pressing strip (42), the bottom protection plate (41) is arranged at the bottom of the battery box body (1), a sealing strip (2) is arranged between the bottom protection plate (41) and the edge position of the battery box body (1), and the bottom protection plate (41) is fixed on the battery box body (1) through a first fastening piece (5) arranged along the outer side circumferential direction of the sealing strip (2); the bottom guard plate pressing strip (42) is connected with the battery box body (1) through a second fastener (3), and the bottom guard plate pressing strip (42) is pressed on the bottom guard plate (41) at one side, far away from the battery box body (1), of the bottom guard plate (41).

2. The protective structure of the battery pack according to claim 1, wherein the bottom protective plate batten (42) comprises a connecting plate (421) and a pressing plate (422) which are connected with each other, the connecting plate (421) is fixedly connected with the side wall of the battery box body (1) through the second fastening piece (3), and the pressing plate (422) is positioned on one side, away from the battery box body (1), of the bottom protective plate (41) and is attached and pressed on the bottom protective plate (41).

3. The protective structure of the battery pack according to claim 2, wherein the bottom protective plate (41) is provided with a first connecting hole for connecting the first fastening member (5), and the pressing plate (422) is provided with an avoiding hole (422c) at a position corresponding to the first connecting hole.

4. The protection structure of the battery pack according to claim 3, wherein a plurality of connecting lugs (421a) are spaced at an end of the connecting plate (421) away from the pressing plate (422), each connecting lug (421a) is provided with a second connecting hole (421b) for connecting with the second fastening member (3), and an end of each connecting lug (421a) extends obliquely in a direction away from the pressing plate (422) to form a guide portion (421 c).

5. The battery pack protection structure according to claim 4, wherein the extension line of the second fastening member (3) does not spatially intersect with the extension line of the first fastening member (5).

6. The battery pack protection structure according to claim 2, wherein the connection portion of the connection plate (421) and the pressing plate (422) is outwardly arched to form a buffer chamber (423).

7. The battery pack protection structure according to claim 3, wherein the bottom guard main body (4) further comprises a reinforcing beam (43), and the reinforcing beam (43) is attached and fixed to one side of the bottom guard (41) away from the battery box body (1).

8. The protective structure of the battery pack according to claim 7, wherein the two ends of the reinforcing beam (43) extend to two sides along the width direction to form connecting pieces (431), third connecting holes (431a) for connecting with the first fasteners (5) are formed in the connecting pieces (431), and at the positions where the reinforcing beam (43) is arranged, the first fasteners (5) are fixedly connected with the battery case (1) after sequentially passing through the third connecting holes (431a) and the first connecting holes, so that the reinforcing beam (43) and the bottom protection plate (41) are fixed on the battery case (1).

9. The battery pack protection structure according to claim 8, wherein a pressure plate (422) provided corresponding to both ends of the reinforcement beam (43) is provided with an escape groove (422d) for escaping from the connection piece (431), and the escape groove (422d) is opened from an end of one end of the pressure plate, which is far from the connection plate (421), in a direction toward the connection plate (421).

10. A vehicle characterized by comprising a protective structure of the battery pack according to any one of claims 1 to 9.