CN114987627B - Electric automobile front floor structure and electric automobile comprising same - Google Patents

Electric automobile front floor structure and electric automobile comprising same Download PDF

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Publication number
CN114987627B
CN114987627B CN202210768817.8A CN202210768817A CN114987627B CN 114987627 B CN114987627 B CN 114987627B CN 202210768817 A CN202210768817 A CN 202210768817A CN 114987627 B CN114987627 B CN 114987627B
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China
Prior art keywords
floor
cross beam
automobile
threshold
electric automobile
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CN202210768817.8A
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Chinese (zh)
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CN114987627A (en
Inventor
李祥伟
欧阳伟刚
朱浩
张友
陈洁林
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chery New Energy Automobile Co Ltd
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Chery New Energy Automobile Co Ltd
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Priority to CN202210768817.8A priority Critical patent/CN114987627B/en
Publication of CN114987627A publication Critical patent/CN114987627A/en
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B62LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62DMOTOR VEHICLES; TRAILERS
    • B62D25/00Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
    • B62D25/20Floors or bottom sub-units
    • B62D25/2009Floors or bottom sub-units in connection with other superstructure subunits
    • B62D25/2018Floors or bottom sub-units in connection with other superstructure subunits the subunits being front structures
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60KARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K1/00Arrangement or mounting of electrical propulsion units
    • B60K1/04Arrangement or mounting of electrical propulsion units of the electric storage means for propulsion
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B62LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62DMOTOR VEHICLES; TRAILERS
    • B62D25/00Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
    • B62D25/20Floors or bottom sub-units
    • B62D25/2009Floors or bottom sub-units in connection with other superstructure subunits
    • B62D25/2027Floors or bottom sub-units in connection with other superstructure subunits the subunits being rear structures
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B62LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62DMOTOR VEHICLES; TRAILERS
    • B62D25/00Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
    • B62D25/20Floors or bottom sub-units
    • B62D25/2009Floors or bottom sub-units in connection with other superstructure subunits
    • B62D25/2036Floors or bottom sub-units in connection with other superstructure subunits the subunits being side panels, sills or pillars
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60KARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K1/00Arrangement or mounting of electrical propulsion units
    • B60K1/04Arrangement or mounting of electrical propulsion units of the electric storage means for propulsion
    • B60K2001/0405Arrangement or mounting of electrical propulsion units of the electric storage means for propulsion characterised by their position
    • B60K2001/0438Arrangement under the floor
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/70Energy storage systems for electromobility, e.g. batteries

Abstract

The invention discloses a front floor structure of an electric automobile and the electric automobile comprising the front floor structure, which comprises a floor body, a middle channel, a seat cross beam, a floor longitudinal beam, a threshold beam, a front baffle lower cross beam and a middle floor cross beam which are integrally formed by high-pressure die casting, wherein the middle channel is arranged at the middle position of the floor body along the length direction of the automobile body, the threshold beam is arranged at two sides of the floor body along the length direction of the automobile body, the front baffle lower cross beam is arranged at the front end of the floor body along the width direction of the automobile body, the middle floor cross beam is arranged at the rear end of the floor body along the width direction of the automobile body, and the seat cross beam is arranged at the middle position of the floor body along the width direction of the automobile body.

Description

Electric automobile front floor structure and electric automobile comprising same
Technical Field
The invention belongs to the field of electric automobiles, and particularly relates to a front floor structure of an electric automobile and the electric automobile comprising the front floor structure.
Background
The front floor structure is used as one of important parts formed by the passenger cabin of the electric automobile body, plays an important role in bearing seats and passengers, plays a key role in sealing and NVH of the passenger cabin, is one of key force transmission paths of side collision of the whole automobile, and is important in protecting the passenger cabin.
The traditional front floor structure is shown in fig. 1 and 2, and is formed by welding and riveting a plurality of steel stamping parts, aluminum stamping parts and aluminum profiles, the joints among the parts are required to be overlapped, the structures are required to be connected together in a welding or riveting mode, and the connecting joints are required to be sealed by special glue, so that the weight is increased, the process is complex, and the sealing performance and the environmental protection performance are poor.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide the front floor structure of the electric automobile and the electric automobile, and the front floor structure can be used as a part of a battery pack shell of the electric automobile to be integrated with a power battery, so that the structural space of the battery pack is increased, and the arrangement space of an electric core is increased.
In order to achieve the above object, the present invention is realized by the following technical scheme:
in a first aspect, this embodiment provides an electric automobile front floor structure, including high-pressure die-casting integrated into one piece's floor body, well passageway, seat crossbeam, floor longeron, threshold roof beam, preceding baffle underbeam and well floor crossbeam, well passageway set up the intermediate position at the floor body along the length direction of automobile body, the threshold roof beam sets up the both sides at the floor body along the length direction of automobile body, preceding baffle underbeam sets up in the front end of floor body along the width direction of automobile body, well floor crossbeam sets up in the rear end of floor body along the width direction of automobile body, the seat crossbeam sets up in the intermediate position of floor body along the width direction of automobile body.
As a further technical scheme, a front joint is further arranged on the lower cross beam of the front baffle, so that the front baffle is connected with the front longitudinal beam of the vehicle body.
As a further technical scheme, the rear end of the floor longitudinal beam is provided with a rear joint, so that the floor longitudinal beam is connected with a rear longitudinal beam of a vehicle body.
As a further technical scheme, the floor body and the middle channel are of unequal-thickness structures.
As a further technical scheme, the floor body and the middle channel are provided with step surfaces or increased in thickness at the positions where the floor body and the middle channel need to be reinforced to realize reinforcement.
As a further technical scheme, the seat cross beam and the threshold beam are required to be reinforced, and the reinforcing ribs are arranged at the positions where the seat cross beam and the threshold beam are required to be reinforced or the thickness is increased to realize the reinforcement.
As a further technical scheme, the floor body, the middle channel, the seat cross beam, the floor longitudinal beam, the threshold beam, the front baffle lower cross beam and the middle floor cross beam are made of alloy aluminum.
As a further technical scheme, the front baffle lower cross beam, the middle floor cross beam and the threshold beam are provided with mounting points of the battery pack lower shell.
In a second aspect, the present invention provides an electric vehicle, including the front floor structure of the electric vehicle.
As a further technical scheme, the front floor structure of the electric automobile is used as an upper shell of the battery pack and is connected with a lower shell of the battery pack.
The beneficial effects of the embodiment of the invention are as follows:
1. according to the invention, the floor body, the middle channel, the seat cross beam, the floor longitudinal beam, the threshold beam, the front baffle lower cross beam and the middle floor cross beam are integrally formed through high-pressure die casting, all welding seams and riveting pieces on the parts are eliminated, the overall weight is reduced compared with that of the existing front floor structure of the electric automobile, the forming process is not complex, and the sealing performance and the environmental protection performance can be achieved.
2. The front baffle lower cross beam, the middle floor cross beam and the front floor structure of the electric automobile are integrally formed, so that the front floor forms a closed frame structure, the beams are not connected in a welded and riveted mode, but form a whole, the rigidity is improved, the force conduction in the collision process is improved, and the frame structure also provides a space for designing connection points for the installation of the battery pack lower shell and a sealed structural space of the upper shell and the lower shell.
3. According to the structural form of the front floor integrated structural member, the invention is realized by adopting a high-pressure die casting process, and the technical characteristics of high-pressure casting are that a relatively complex structure and a thin-wall structure can be formed, and the minimum thickness can reach 1mm to 1.5 mm.
4. The front joint, the threshold beam and the rear joint effectively connect the front longitudinal beam and the rear longitudinal beam together to form an integral penetrating beam structure from front to back, and the integral penetrating beam structure has good lifting effect on the rigidity, the frontal collision and the rear collision of the whole body framework.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
FIG. 1 is a block diagram of a conventional front floor assembly;
FIG. 2 is an exploded view of a conventional front floor assembly;
FIG. 3 is a front floor integrated structure assembly of the present invention;
FIG. 4 is a schematic view of the front floor integrated structure of the present invention as a battery pack upper case;
in the figure: the mutual spacing or dimensions are exaggerated for the purpose of showing the positions of the various parts, and the schematic illustrations are used for illustration only.
100. A conventional front floor assembly; 200. an aluminum alloy die-casting integrated front floor assembly;
101. a conventional floor body; 102. a traditional middle channel body; 103. a traditional seat beam body; 104. a traditional floor stringer; 105. a conventional threshold beam;
201. a joint structure; 202. a middle channel; 203. a seat cross member; 204. a floor body; 205. a threshold beam; 206. a joint structure; 207. lower shell mounting point structure of battery package, 208 front baffle lower beam, 209 middle floor crossbeam.
Detailed Description
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present invention. As used herein, the singular forms also are intended to include the plural forms unless the present invention clearly dictates otherwise, and furthermore, it should be understood that when the terms "comprise" and/or "include" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof;
noun interpretation: the term "high-pressure die casting" in the present invention means that the casting pressure of the front floor assembly integrated structure 200 is 30MPa or more.
In the prior art, as shown in fig. 1 and 2, the front floor structure 100 of the automobile body is formed by connecting parts such as a floor body 101, a middle channel body 102, a seat cross beam 103, a floor longitudinal beam 104, a threshold beam 105 and the like together by welding to form the front floor assembly 100, the floor body 101 and the middle channel body 102 are plate structures, can be steel stamping parts or aluminum alloy stamping parts, the seat cross beam, the floor longitudinal beam and the threshold beam are beam structures and can be steel stamping parts or aluminum alloy sections, but the connecting parts of the structures need structural overlapping, the structures need to be connected together by welding or riveting, and the connecting joints need to be sealed by special glue, so that the weight is increased, the process is complex, and the sealing performance and the environmental protection performance are poor.
In order to solve the above-mentioned problems, the present embodiment proposes a new front floor assembly integrated structure 200, the front floor assembly integrated structure 200 in this embodiment designs the floor body, the middle channel body, the seat cross beam, the floor longitudinal beam, and the threshold beam as an integrated structure, and simultaneously, the front baffle lower cross beam, the middle floor cross beam, and the front floor assembly are integrally formed, that is, the floor body, the middle channel body, the seat cross beam, the floor longitudinal beam, the threshold beam, the front baffle lower cross beam, and the middle floor cross beam are all designed as an integrated structure, specifically, the aluminum alloy material is adopted to realize the integrated forming of the floor body, the middle channel body, the seat cross beam, the floor longitudinal beam, the threshold beam, the front baffle lower cross beam, and the middle floor cross beam by a high-pressure die casting process, so that all welds and rivets on these components are eliminated, the overall weight is reduced compared with the existing front floor structure of an electric vehicle, and the forming process is not complex, and the sealing performance and environmental protection can be achieved.
Specifically, as shown in fig. 3 and 4, the front floor assembly integrated structure 200 includes a high-pressure die-cast floor body 204, a middle channel 202, a seat cross beam 203, a threshold beam 205, a front baffle lower cross beam 208, and a middle floor cross beam 209; the middle channel 202 is disposed at a middle position of the floor body 204 along a longitudinal direction of the automobile body, the two threshold beams 205 are disposed at left and right sides of the floor body 204 along the longitudinal direction of the automobile body, the front fender lower beam 208 is disposed at a front end of the floor body 204 along a width direction of the automobile body (a direction in which the front end is directed is consistent with a front-rear direction in a general sense), the middle floor beam 209 is disposed at a rear end of the floor body 204 along the width direction of the automobile body (a direction in which the rear end is directed is consistent with the front-rear direction in a general sense), the two seat beams 203 are disposed at a middle position of the floor body 204 along the width direction of the automobile body, and the two seat beams 203 are disposed parallel to each other.
The material used in the die casting process is an alloy aluminum, that is, the front floor assembly integrated structure 200 provided in this embodiment is made of an alloy aluminum material, the alloy element may be one or a combination of several of magnesium, copper, silicon and manganese, the alloy content may be between 3% and 15%, and if the total content of the alloy of the elements is generally not more than 15%.
The front floor assembly integrated structure is realized by adopting a high-pressure casting process according to the structural form of the front floor integrated structure, and is technically characterized in that a relatively complex structure and a thin-wall structure can be formed, and the minimum thickness can reach 1mm to 1.5 mm.
It should be further noted that, the front baffle lower beam 208 is a component of the existing electric automobile, and the front baffle lower beam 208 of the existing electric automobile is mostly of a steel structure, and is generally disposed on the front baffle, and the front baffle and the front floor are welded together, while in this embodiment, the front baffle lower beam 208 and the front floor are integrally formed by high-pressure die casting.
It should be further noted that the middle floor beam 209 is generally disposed on the middle floor, and the middle floor beam 209 and the front floor structure are integrally formed by high-pressure die casting in this embodiment.
In this embodiment, with preceding baffle crossbeam, well floor crossbeam and preceding floor structure integrative die casting shaping, can make preceding floor form the structure of a sealed frame roof beam, the overall rigidity of preceding floor can be better. The front baffle cross beam 208 forms a complete integral structure with the threshold beam 205 and the front longitudinal beam rear 201, which is more beneficial to the transmission of the frontal collision force and prevents the structural effect in the collision process. The middle floor beam 209 forms a complete integral structure with the threshold beam 205 and the middle channel 202, which is more beneficial to the conduction of side collision force and prevents the structural effect in the collision process. At the same time, the integrated frame beam structure also provides space and sealing surfaces for the installation of the battery pack lower shell.
It should be further noted that, the shapes of the floor body 204, the middle channel 202, the seat cross beam 203, and the threshold beam 205 are specifically designed according to different vehicle type structures.
The middle part of the front floor integrated structure in the embodiment comprises a middle channel 202, a seat cross beam 203, a floor body 204 and a threshold beam 205, and the integrated structure is an important component of the cockpit, and besides the function of the traditional automobile front floor, the integrated structure plays a good role in bending and torsional rigidity of the whole automobile body, and plays a good role in decomposing the transmission of side collision force (such as a side collision force transmission path).
Furthermore, the thickness of the middle channel 202 and the floor body 204 as the skin structure of the floor assembly can be between 1 and 3mm, the design of different material thickness can be realized according to the local rigidity and the modal requirement, and the step surface is designed or the thickness is increased to strengthen the part needing to be strengthened, which is the advantage of the integral molding technology of the die casting process.
Furthermore, the seat cross beam 203 and the threshold beam 205 are used as key bearing structures, and in order to improve the rigidity of the seat mounting point and improve the performance of side collision, the thickness of the structure can be between 2 mm and 5mm, and reinforcing ribs are designed or increased in thickness at the places needing to be reinforced to realize the reinforcement.
Further, in the present embodiment, a joint structure 206 is further provided at the rear end of the threshold beam 205; a joint structure 201 is also arranged on the front baffle lower beam 208; the joint structure 201, the joint structure 206 and the front floor assembly are integrally formed, the joint structure 201, the threshold beam 205 and the joint structure 206 are used for effectively connecting the front longitudinal beam and the rear longitudinal beam of the automobile together to form a front-to-rear integral penetrating beam structure, and the integral rigidity, the frontal collision and the rear collision of the automobile body framework are well improved.
Specifically, the front part of the front floor assembly integrated structure comprises a joint structure 201 connected with a front longitudinal beam, and the joint structure 201 is formed by integral high-pressure die casting of the upper floor body 204, a middle channel 202, a seat cross beam 203, the floor longitudinal beam 204, a threshold beam 205, a front baffle lower cross beam 208, a middle bottom plate cross beam 209 and the like; the joint structure 201 combines the root of the longitudinal beam, the threshold and the lower cross beam of the front baffle into a whole, the die-casting integrated structure can freely design the structural strength according to the condition of collision stress, the structural thickness can be between 2 and 5mm, reinforcing ribs can be locally designed, and the reinforcing ribs can be distributed in a fine strip shape or a honeycomb shape. When a frontal collision occurs, the generated force can be effectively transmitted to the front baffle cross beam and the threshold (as shown in the figure to collide with the force transmission path) respectively through the joint, so that the integrity of the longitudinal beam in the frontal collision process is improved, the intrusion quantity of the front wall is reduced, and the injury to human bodies is reduced. Meanwhile, the joint structure can be effectively connected with the front longitudinal beam, can be assembled and connected through bolts, and can be riveted through rivets.
Further, the rear part of the front floor integrated structure in this embodiment includes a joint structure 206 connected to the rear longitudinal beam, and the joint structure 206 integrates the rear part of the threshold and the rear cross member of the front floor into a whole structure, so that the rigidity and strength of the connection point with the rear longitudinal beam are improved, and the rear longitudinal beam and the front longitudinal beam can be riveted through bolts or rivets.
Further, the specific shape of the joint structure 201 is designed according to the joint shape of the front side member rear portion of the existing vehicle type, and the specific shape of the joint structure 206 is designed according to the joint shape of the rear side member front portion of the existing vehicle type.
Further, in the electric automobile body, the front floor integrated structure described above may also be used as a battery pack upper case, and when the front floor integrated structure is also used as a battery pack upper case, the mounting points of the battery pack lower case are designed on several beam structures (including two threshold beams 205, a front baffle lower beam 208 and a middle floor beam 209) of the periphery of the floor assembly integrated part, and this structure is assembled with the lower case to form a battery pack assembly. Specifically, when the front floor integrated structure 200 is used as an upper casing of a battery pack in an electric automobile, a mounting point structure 207 of a lower casing of the battery pack can be designed on a lower circumference of the front floor integrated structure 200, and the lower casing of the battery pack can form a complete battery pack casing with the front floor integrated structure 200 through the mounting point structure 207. Through this kind of structural scheme, can promote the inside arrangement space of battery package, if cancelled the reservation clearance between traditional electric automobile battery package and the preceding floor, like can all regard as the inside arrangement space of battery package with seat crossbeam 203 and well passageway 202's evagination structure, promote the capacity of electric core, promote the mileage of endurance.
Further, the embodiment also provides an electric vehicle, wherein the front floor structure of the electric vehicle adopts the front floor integrated structure, and the front floor in the vehicle adopts the front floor integrated structure, so that the vehicle has all the advantages as described above. In some embodiments, the electric vehicle provided by the invention can be an existing new energy vehicle or a hybrid electric vehicle.
Further, the front floor structure of the electric automobile is further used as an upper shell of a battery pack of the automobile, the lower circumference of the front floor integrated structure can be provided with a mounting point structure of a lower shell of the battery pack, and the lower shell of the battery pack can form a complete battery pack shell through the mounting point structure and the front floor integrated structure. Through this kind of structural scheme, can promote the inside arrangement space of battery package, if cancelled the reservation clearance between traditional electric automobile battery package and the preceding floor, can all regard as the inside arrangement space of battery package with seat crossbeam and the evagination structure of well passageway, promote the capacity of electric core, promote the mileage of endurance.
Finally, it is pointed out that relational terms such as first and second are 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.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (8)

1. The front floor structure of the electric automobile is characterized by comprising a floor body, a middle channel, a seat cross beam, a floor longitudinal beam, a threshold beam, a front baffle lower cross beam and a middle floor cross beam which are integrally formed by high-pressure die casting, wherein the middle channel is arranged at the middle position of the floor body along the length direction of the automobile body, the threshold beam is arranged at two sides of the floor body along the length direction of the automobile body, the front baffle lower cross beam is arranged at the front end of the floor body along the width direction of the automobile body, the middle floor cross beam is arranged at the rear end of the floor body along the width direction of the automobile body, the seat cross beam is arranged at the middle position of the floor body along the width direction of the automobile body, and the front baffle lower cross beam, the middle floor cross beam and the front floor structure of the electric automobile are integrally formed, so that the front floor forms a closed frame structure;
the rear end of the threshold beam is further provided with a first joint structure, the lower cross beam of the front baffle is further provided with a second joint structure, the first joint structure, the second joint structure and the front floor body are integrally formed, and the structure and the beam structure are integrated to form an integral penetrating beam structure; the high-pressure die casting refers to that the casting pressure of the front floor structure is more than 30 MPa.
2. The structure of the front floor of the electric automobile according to claim 1, wherein the floor body and the middle channel are of unequal thickness.
3. The electric automobile front floor structure of claim 2, wherein the floor body and the middle channel are provided with step surfaces or increased thickness at positions where the reinforcement is required to be achieved.
4. The structure of the front floor of the electric automobile according to claim 1, wherein the seat cross beam and the threshold beam are reinforced by reinforcing ribs or increasing thickness.
5. The front floor structure of claim 1, wherein the floor body, the middle channel, the seat cross member, the floor longitudinal beam, the threshold beam, the front baffle lower cross member and the middle floor cross member are made of alloy aluminum.
6. The front floor structure of claim 1, wherein the front baffle lower cross member, the middle floor cross member and the threshold beam are provided with mounting points of a battery pack lower shell.
7. An electric vehicle, characterized by comprising an electric vehicle front floor structure according to any one of claims 1-6.
8. The electric vehicle of claim 7, characterized in that the electric vehicle front floor structure is connected to the lower case of the battery pack as the upper case of the battery pack.
CN202210768817.8A 2022-07-01 2022-07-01 Electric automobile front floor structure and electric automobile comprising same Active CN114987627B (en)

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