CN114571976B - Integrated structure of automobile body and battery package under integrated electric automobile - Google Patents

Integrated structure of automobile body and battery package under integrated electric automobile Download PDF

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Publication number
CN114571976B
CN114571976B CN202210158050.7A CN202210158050A CN114571976B CN 114571976 B CN114571976 B CN 114571976B CN 202210158050 A CN202210158050 A CN 202210158050A CN 114571976 B CN114571976 B CN 114571976B
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China
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integrated
battery pack
cross
plate
floor
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CN202210158050.7A
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CN114571976A (en
Inventor
段利斌
周华锦
杜展鹏
江浩斌
刘星
徐伟
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Jiangsu University
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Jiangsu University
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT 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
    • B60K1/00—Arrangement or mounting of electrical propulsion units
    • B60K1/04—Arrangement or mounting of electrical propulsion units of the electric storage means for propulsion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
    • B62D25/20—Floors or bottom sub-units
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/613—Cooling or keeping cold
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
    • H01M10/625—Vehicles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/244—Secondary casings; Racks; Suspension devices; Carrying devices; Holders characterised by their mounting method
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/249—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders specially adapted for aircraft or vehicles, e.g. cars or trains
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Electrochemistry (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Manufacturing & Machinery (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Body Structure For Vehicles (AREA)
  • Arrangement Or Mounting Of Propulsion Units For Vehicles (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

The invention provides an integrated structure for integrating a lower vehicle body and a battery pack of an electric vehicle, which comprises an integrated vehicle body floor, a lower vehicle body and a battery pack lower box body, wherein the integrated vehicle body floor comprises an integrated floor and a seat beam assembly, and has the functions of installing a seat, bearing passengers and serving as an upper cover of the battery pack; the integrated floor is connected with the lower car body through a hollow double-thread bolt, and two ends of the seat beam assembly are connected with a threshold beam of the lower car body through a connecting joint; the lower box body of the battery pack is connected with the lower vehicle body through a hollow double-thread bolt and is connected with the seat beam assembly through a middle lifting lug; the lower box body of the battery pack is connected with the battery core through a filling material. The integrated structure provided by the invention can realize the high integration of the lower vehicle body and the battery pack, is beneficial to reducing the weight of the whole vehicle, and improves the volume utilization rate and the energy density of the battery pack, thereby improving the endurance mileage of the electric vehicle.

Description

Integrated structure of automobile body and battery package under integrated electric automobile
Technical Field
The invention relates to the technical field of new energy automobiles, in particular to an integrated structure of an integrated electric automobile lower automobile body and a battery pack.
Background
With the development of new energy automobile technology, consumers have higher and higher requirements on the endurance mileage of the electric automobile. The performance of the battery pack is an important factor affecting the endurance mileage of the electric automobile, and how to improve the performance of the battery pack is an important point of attention of automobile and battery manufacturers. In order to achieve the purpose of long endurance mileage of the electric automobile, the unit energy density of the battery pack needs to be improved as much as possible on the premise of limited space and ensuring the protection safety of the battery core, and the improvement of the unit energy density of the battery pack is mainly considered from the two aspects of reducing the weight of the battery pack box and improving the volume utilization rate of the box.
For improving the volume utilization rate of the battery pack box body, the size of the battery module can be optimized, the battery module can be developed from an initial 355 module to a 390 module and then to a later 590 module, the size of the battery module is continuously optimized, and the volume utilization rate of the battery pack box body is higher and higher. Along with the development of power battery technology, the volume of a single battery is larger and larger, and the shape of the single battery is more and more diversified, so that a CTP battery PACK (Cell to PACK) is developed, the battery Cell is directly integrated into the battery PACK, the battery Cell is directly arranged in a battery PACK box body, the number of parts of the box body is reduced, and the volume utilization rate of the battery PACK box body is further improved.
In the related art, most of power battery packs of new energy automobiles are provided with a complete upper cover and a complete lower box, and the upper cover and the lower box form a closed box structure for accommodating an electric core.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides an integrated structure integrating the lower automobile body of the electric automobile and the battery pack, which increases the utilization rate of the battery pack and reduces the weight of the whole automobile.
The present invention achieves the above technical object by the following means.
An integrated structure of an integrated electric automobile lower body and a battery pack, comprising:
the integrated car body floor is formed by sequentially connecting an upper reinforcing plate, an integrated floor and a lower reinforcing plate from top to bottom into a whole; the integrated floor is provided with a plurality of seat cross beams at the positions corresponding to the installation positions of the automobile seats, and the cross sections of the seat cross beams and the upper reinforcing plate in the length direction of the automobile body are identical in shape; the seat beam, the upper reinforcing plate and the lower reinforcing plate form a seat beam assembly; the two ends of the seat beam assembly are provided with connecting joints;
the battery pack lower box body comprises a lower box body frame, a diagonal cable device, a middle lifting lug, a liquid cooling system and a bottom guard plate, wherein an opening cavity for accommodating a battery core is formed after the liquid cooling system is matched with the lower box body frame; the lower box body frame is connected with the integrated car body floor; the middle lifting lug is connected with the first cross beam and the seat cross beam assembly;
the integrated car body floor is connected with the floor connecting surface of the lower car body, and after being matched with the lower box body of the battery pack, the integrated car body floor forms a sealed cavity for accommodating the battery cell.
In the technical scheme, the connecting joint comprises a joint, a reinforcing connecting plate and a vehicle body connecting plate, wherein the reinforcing connecting plate is connected with a joint connecting surface of the vehicle body connecting plate; one end of the joint is a first cross section beam in a shape like a Chinese character 'ri', the other end of the joint is a first cross section beam in a shape like a Chinese character 'C', the upper end of the first cross section beam in a shape like a Chinese character 'ri' is connected with the upper reinforcing plate, the side edge of the first cross section beam in a shape like a Chinese character 'ri' is connected with the joint connecting surface of the vehicle body connecting plate, and the bevel edge of the first cross section beam in a shape like a Chinese character 'ri' is connected with the end surface of the seat cross beam; the reinforced connecting plate is provided with a connecting plate with the same cross section shape as the upper reinforcing plate in the length direction of the vehicle body, and the connecting plate is connected with the upper reinforcing plate; the upper ends of the first cross-section beams are connected with the upper reinforcing plate.
In the technical scheme, the lower box body frame is formed by splicing a Z-shaped frame and a cross beam in a shape of a Chinese character 'kou'; the Z-shaped frame is formed by sequentially connecting a second C-shaped section beam, a second Y-shaped section beam and a second opening-shaped section beam from the outer side to the inner side of the lower box body of the battery pack; the upper and lower connecting surfaces of the second C-shaped section beam are respectively provided with a through hole for being matched with the hollow double-thread bolt; the bottom of the cross beam with the second cross section in the shape of Chinese character 'ri' is provided with a bottom guard plate connecting surface for being matched and connected with the bottom guard plate; the second 'mouth' shaped section beam is provided with a liquid cooling system connecting surface for connecting with a liquid cooling system.
In the technical scheme, the battery pack lower box body is connected with the integrated vehicle body floor through the hollow double-thread bolt, the hollow double-thread bolt is of a two-section concentric cylindrical hollow structure, and a first step is formed at the joint of the two sections of cylinders; the two sections of concentric cylinders comprise a first cylinder and a second cylinder, the outer cylindrical surface of the first cylinder is provided with first external threads, the inner cylindrical surface of the first cylinder is provided with first internal threads, and the bottom of the second cylinder is provided with a sealing groove A and a hexagonal countersink.
In the above technical scheme, the inclined cable device comprises two turnbuckle bolts, four lifting hooks, two lifting ring bolts, a lifting ring nut and a bracket, wherein two ends of the turnbuckle bolts are respectively connected with the lifting hooks in a matched manner to form an inclined cable, one end of the inclined cable is connected with the lifting ring bolts, the other end of the inclined cable is connected with the lifting ring nut, and the bottom end of the lifting ring nut is connected with the bracket in a matched manner.
In the technical scheme, the middle lifting lug comprises a T-shaped nut, a sealing ring B, a supporting block, a sleeve, a sealing ring C and a flange bolt A; the T-shaped nut is connected with the flange bolt A in a matched manner; the support block is of a cylindrical structure with a countersunk through hole in the center, and the countersunk through hole is used for being matched with the sleeve; the sleeve is of a hollow stepped shaft structure, a second step of the sleeve is connected with the supporting block, a sealing groove C is formed in the bottom of the sleeve and used for installing the sealing ring C, and a through hole J is formed in the sleeve and used for being matched with the flange bolt A.
In the above technical scheme, the integrated floor is provided with a plurality of reinforcing ribs A in the height direction of the battery pack, and a plurality of reinforcing ribs B are arranged at the position of the lower reinforcing plate corresponding to the seat cross beam.
In the above technical scheme, a plurality of electric cores are arranged in the opening cavity, a gap is reserved between the electric cores and the opening cavity, and filling materials are poured in the gap.
In the technical scheme, the embedded pipes are arranged in the gaps, and when filling materials are poured, cavities are formed at the embedded pipes.
In the technical scheme, the integrated floor, the upper reinforcing plate, the lower reinforcing plate, the reinforcing connecting plate and the bottom guard plate are all formed by processing composite materials or metal materials or mixed materials.
The beneficial effects of the invention are as follows:
(1) According to the invention, an integrated vehicle body floor is connected with a floor connecting surface of a lower vehicle body and is matched with a lower box body of a battery pack to form a sealed cavity for accommodating a battery core, the integrated vehicle body floor is formed by sequentially connecting an upper reinforcing plate, an integrated floor and a lower reinforcing plate into a whole from top to bottom, a seat beam assembly is formed by the integrated floor, the upper reinforcing plate and the lower reinforcing plate, and connecting joints are assembled at two ends of the seat beam assembly; through the design, the lower vehicle body and the battery pack are integrated, redundant design between the power battery pack and the vehicle body is reduced, and the number of parts of the vehicle body is reduced, so that the utilization rate of the battery pack is increased, and the weight of the whole vehicle is reduced.
(2) The invention fully utilizes the advantages of the composite material and the metal material, realizes the integration of the vehicle body floor, the seat cross beam and the battery pack upper cover through the composite use of the composite material and the metal material, reduces the number of vehicle body parts, and can form the seat cross beam parts with different cross section shapes through different combinations of the seat cross beams, the upper reinforcing plates and the lower reinforcing plates with different structural forms so as to meet the requirements of different vehicle types.
(3) The connecting joint in the structure optimizes the connection of the seat beam assembly and the threshold beam, reduces the influence of the stress of the seat beam assembly on the lower box body of the battery pack, and improves the side collision performance of the vehicle body.
(4) The hollow double-thread bolt and the middle lifting lug in the structure can enhance the structural strength of the joint of the battery pack lower box body and the vehicle body lower vehicle body, facilitate the disassembly and assembly of the battery pack lower box body, and enable the battery pack to have good maintainability.
(5) The inclined cable device in the structure can be used for reducing or replacing the arrangement of the cross beam of the lower box body of the battery pack, is beneficial to improving the volume utilization rate of the box body of the battery pack and effectively reducing the deformation of the liquid cooling system after being stressed.
(6) The battery core in the structure of the invention realizes the direct connection of the battery core and the battery pack by the way of connecting the filling material with the lower box body of the battery pack, eliminates the concept of a module in the traditional installation form, simplifies the assembly process, reduces the number of parts of the lower box body of the battery pack, and is beneficial to realizing the weight reduction of the lower box body of the battery pack and improving the volume utilization rate of the lower box body.
(7) The battery cells in the lower box body of the battery pack in the structure are flexibly arranged and are applicable to different shapes, sizes and battery cells, and the mixed arrangement of the battery cells with different specifications can be realized.
(8) The filling material in the structure of the invention enables the battery cell and the lower box body of the battery pack to be connected into a whole, thereby effectively improving the performances of the battery pack such as strength, rigidity, torsion resistance, shearing resistance and the like.
Drawings
Fig. 1 is an exploded view of an integrated structure of a lower body and a battery pack of an integrated electric vehicle according to the present invention;
FIG. 2 is an exploded view of an integrated body floor according to the present invention;
FIG. 3 is a partial cross-sectional view of an integrated body floor according to the present invention;
FIG. 4 (a) is a schematic view of an integrated floor structure according to the present invention;
FIG. 4 (b) is a bottom view of the integrated floor of the present invention;
FIG. 5 is a schematic view of the upper stiffener structure according to the present invention;
FIG. 6 is a schematic view of a lower reinforcement plate structure according to the present invention;
FIG. 7 (a) is a first cross-sectional shape of a seat beam assembly according to the present invention;
FIG. 7 (b) is a second cross-sectional shape of the seat beam assembly of the present invention;
FIG. 7 (c) is a third cross-sectional shape of the seat beam assembly of the present invention;
FIG. 8 is a schematic view of a connection joint according to the present invention;
FIG. 9 is a schematic view of a reinforcing web structure according to the present invention;
FIG. 10 (a) is an isometric view of a joint according to the present invention;
FIG. 10 (b) is a front view of the joint of the present invention;
FIG. 11 is a schematic view of a hollow double-threaded bolt according to the present invention;
FIG. 12 is a schematic view of the seating cross beam assembly and connector assembly of the present invention;
FIG. 13 is a schematic view of the assembly relationship between the integrated body floor and the lower body of the present invention;
fig. 14 is a schematic view of the structure of the lower case of the battery pack according to the present invention;
FIG. 15 is a schematic view of a lower housing frame according to the present invention;
FIG. 16 (a) is an isometric view of a rim with a "Z" shaped outer profile according to the present invention;
FIG. 16 (b) is a cross-sectional view of a rim having a "Z" shape in its outer contour in accordance with the present invention;
FIG. 17 is a schematic view of a cross beam with an outer contour shaped like a Chinese character 'kou';
FIG. 18 is a schematic view of a cable device in accordance with the present invention;
FIG. 19 is a schematic view of a bracket structure according to the present invention;
fig. 20 is a schematic view of an intermediate lifting lug structure according to the present invention;
FIG. 21 is a schematic view of a T-nut according to the present invention;
FIG. 22 is a schematic view of a supporting block according to the present invention;
FIG. 23 is a schematic view of a sleeve according to the present invention;
FIG. 24 (a) is an exploded view of the liquid cooling system according to the present invention;
FIG. 24 (b) is a top view of the lower plate according to the present invention;
FIG. 25 is a schematic view of the structure of the bottom guard plate according to the present invention;
FIG. 26 is a schematic diagram illustrating the assembly of a liquid cooling system, a bottom shield and a polygonal frame structure according to the present invention;
FIG. 27 (a) is an assembly view of a liquid cooling system, a bottom shield and a second cross member according to the present invention;
FIG. 27 (b) is an assembly view of the liquid cooling system, bottom shield and first cross member of the present invention;
FIG. 28 (a) is a schematic diagram illustrating the assembly of the intermediate portion of the cable assembly with a liquid cooling system according to the present invention;
FIG. 28 (b) is a schematic view of the assembly of two ends of the cable device of the present invention with a first cross member;
fig. 29 (a) is an isometric view of an embodiment of a battery pack lower case mounting a battery cell according to the present invention;
fig. 29 (b) is a cross-sectional view showing an embodiment of the battery pack lower case mounting the battery cell according to the present invention;
fig. 30 (a) is a second exploded view of an embodiment of the battery pack lower case mounting a battery cell according to the present invention;
fig. 30 (b) is a second cross-sectional view of an embodiment of the battery pack lower case mounting the battery cell according to the present invention;
FIG. 31 (a) is an assembled cross-sectional view of the first cross-beam and seat cross-beam assembly of the present invention;
FIG. 31 (b) is an enlarged partial view A of an assembled cross-sectional view of the first cross-beam and seat cross-beam assembly of the present invention;
FIG. 31 (c) is an enlarged partial view B of an assembled cross-sectional view of the first cross-beam and seat cross-beam assembly of the present invention;
FIG. 32 (a) is a schematic diagram illustrating the assembly of a polygonal bezel structure and an integrated underbody according to the present invention;
fig. 32 (b) is a partial enlarged view of the assembly of the polygonal frame structure and the integrated underbody according to the present invention.
Wherein: 100-integrated body floor, 101-seat cross-beam assembly, 110-upper reinforcement panel, 111-through-hole P, 120-connection joint, 121-body connection panel, 122-reinforcement connection panel, 123-joint, 124-body connection panel, 125-joint connection panel, 1221-flange, 1222-connection panel, 1241-first "sun" cross-section beam, 1242-first "C" cross-section beam, 1245-first right-angle side, 1246-second right-angle side, 1247-hypotenuse, 130-body gasket, 140-integrated floor, 141-electrical bin, 142-seat cross-beam, 143-flange side A, 144-through-hole A, 145-stiffener B, 146-seat cross-beam end, 147-through-hole B, 150-lower reinforcement panel, 151-flange side B152-through hole C, 153-reinforcing rib B, 154-through hole D, 160-battery pack lower box gasket, 200-battery pack lower box, 210-lower box frame, 211-first frame, 2110-liquid cooling system connecting surface, 2111-second C-shaped cross-section beam, 2112-second Y-shaped cross-section beam, 2113-second Y-shaped cross-section beam, 2114-rivet nut mounting hole, 2115-C-shaped cross-section beam upper connecting surface, 2116-through hole G, 2117-C-shaped cross-section beam upper connecting surface, 2118-through hole H, 2119-bottom guard plate connecting surface, 212-second frame, 213-third frame, 214-fourth frame, 215-first beam, 216-second beam, 217-edge frame structure, 218-beam connection joint, 219-through hole I, 220-liquid cooling system, 221-upper liquid cooling plate, 222-lower liquid cooling plate, 223-water outlet pipe, 224-water inlet pipe, 225-water outlet pipe, 226-water inlet pipe, 227-through hole K, 228-through hole L, 229-runner, 2210-through hole M, 2211-through hole N, 2212-flange edge D, 230-bottom guard plate, 231-reinforcing rib C, 232-boss, 234-through hole O, 235-flange edge C, 240-hot melt self-tapping, 250-middle lifting lug, 251-T-shaped nut, 2511-bottom plate B, 2512-hollow cylinder, 2513-second internal thread, 252-sealing ring B, 253-supporting block, 2531-sealing groove B, 2532-upper connecting surface of supporting block 2533-countersunk through hole, 2535-support block lower connecting surface, 254-sleeve, 2541-through hole J, 2542-second step, 2543-third step, 2544-seal groove C, 2545-sleeve bottom connecting surface, 255-seal ring C, 256-flange bolt A, 257-seal ring A, 258-flange bolt B, 260-diagonal cable device, 261-basket bolt, 262-hook, 263-eye screw, 264-eye nut, 265-bracket, 266-diagonal cable, 2651-cylinder A, 2652-bottom plate A, 2653-second external screw, 270-blind rivet nut, 300-lower body, 301-front lower body, 302-threshold beam, 304-rear lower body, 400-weld bolt, 500-hollow double-threaded bolts, 501-first steps, 502-first external threads, 503-first internal threads, 504-through holes E, 505-hexagonal counter bores, 506-sealing grooves A, 507-second cylinders, 508-first cylinders, 600-electric cores, 700-filling materials, 800-embedded pipes and 900-cavities.
Detailed Description
The invention will be further described with reference to the drawings and the specific embodiments, but the scope of the invention is not limited thereto.
Fig. 1 is an integrated structure of a lower body and a battery pack of an integrated electric vehicle, which comprises a lower body 300 and a lower battery pack case 200, wherein the lower battery pack case 200 is positioned below the lower body 300; the lower car body 300 comprises a front lower car body 301, a rear lower car body 304 and threshold beams 302, wherein the front lower car body 301 is positioned at the front end of the lower car body 300, the rear lower car body 304 is positioned at the rear end of the lower car body 300, and the front lower car body 301 and the rear lower car body 304 are connected through the two threshold beams 302; as shown in fig. 32 (a), the edge of the integrated body floor 100 is connected with the floor connection surface of the lower body 300 by a hollow double-threaded bolt 500, and a body gasket 130 (fig. 2) is provided at the connection of the integrated body floor 100 and the lower body 300 for ensuring the air tightness of the lower body 300; the polygonal frame structure 217 of the battery pack lower box body 200 is provided with a plurality of through holes G2116 and H2118, and is connected with the integrated vehicle body floor 100 through flange bolts B258 after being matched with the hollow double-threaded bolts 500; the integrated car body floor 100 has the function of a battery pack upper cover, and forms a sealed cavity for accommodating the battery cell after being matched with the battery pack lower box 200; the integrated body floor 100 has characteristics of insulation, high temperature resistance, and the like, and can effectively protect the safety of passengers.
As shown in fig. 2 and 3, which are schematic views of the structure of the integrated body floor, the integrated body floor 100 includes three parts, namely an integrated floor 140, an upper reinforcing plate 110 and a lower reinforcing plate 150, wherein the upper reinforcing plate 110, the integrated floor 140 and the lower reinforcing plate 150 are sequentially arranged from top to bottom and are connected together by welding or structural adhesive. The integrated underbody 100 integrates the functions of the floor, seat cross members and battery pack upper cover, reduces redundant design between the battery pack and the vehicle body, and improves the volume utilization of the vehicle body space.
The integrated floor 140 is formed by processing materials such as composite materials, metal materials or mixed materials (mixed by two different materials), as shown in fig. 4 (a), the integrated floor 140 is provided with a plurality of seat cross beams 142 at corresponding automobile seat installation positions for installing an automobile seat; an electric appliance bin 141 is arranged at the rear part of the integrated floor 140 and is used for accommodating electric devices; a plurality of reinforcing ribs A145 are arranged in the height direction of the battery pack and are used for improving structural performance; the edge is provided with a flange A143, and the flange A143 is provided with a plurality of through holes A144 which are used for being connected with the lower vehicle body 300 after being matched with the hollow double-threaded bolt 500; the seat beam 142 is provided with a through hole B147 (fig. 4 (B)) at the bottom for mounting the T-nut 251.
The upper reinforcing plate 110 is processed from a composite material, a metal material, a mixed material, or the like; the upper reinforcing plate 110 and the seat cross beam 142 have the same cross section shape in the length direction of the vehicle body, and can be attached to each other and connected through welding or structural adhesive; as shown in fig. 5, the upper reinforcing plate 110 is provided with a through hole P111 for mounting a T-nut 251.
The lower reinforcing plate 150 is processed from a composite material, a metal material, or a mixed material; the lower reinforcing plate 150 has the same cross-sectional shape as the integrated floor panel 140 in the vehicle width direction, and can be bonded to each other; as shown in fig. 6, a plurality of reinforcing ribs B153 are provided at positions of the lower reinforcing plate 150 corresponding to the seat cross beam 142, for enhancing structural strength of the lower reinforcing plate 150; the two ends of the lower reinforcing plate 150 are provided with flange edges B151, the flange edges B151 are provided with through holes C152 concentric with the through holes A144, and the through holes C152 are used for being connected with the lower vehicle body 300 through the hollow double-threaded bolts 500, so that the born force is dispersed to the vehicle body, and the structural performance of the seat cross beam assembly is enhanced; the lower reinforcement plate 150 is provided with a through hole D154 for mounting the T-nut 251.
The seat beam 142, the upper reinforcing plate 110 and the lower reinforcing plate 150 form a seat beam assembly 101 (fig. 1) with a closed cross section, and the seat beam assembly 101 with different cross section shapes can be formed by different combinations of the seat beam 142, the upper reinforcing plate 110 and the lower reinforcing plate 150 with different structural forms so as to meet the requirements of different vehicle types; fig. 7 (a), (b), and (c) depict seat beam assemblies of three cross-sectional shapes, and the seat beam assembly of the present invention is not limited to the three cross-sectional shapes.
As shown in fig. 2, both ends of the seat cross assembly 101 are fitted with the joint connectors 120, and as shown in fig. 8, the joint connectors 120 include three parts of a joint 123, a reinforcement link plate 122, and a vehicle body link plate 121.
As shown in fig. 9, the reinforcing connection plate 122 is formed by processing a composite material, a metal material, a mixed material, or the like; the reinforcing connection plate 122 is provided with a connection plate 1222, the connection plate 1222 and the upper reinforcing plate 110 have the same cross section shape along the length direction of the vehicle body, and the connection plate 1222 and the upper reinforcing plate 110 can be completely attached; the reinforcement web 122 is provided with a flange 1221 for connection to the joint connection surface 125 of the body web 121.
The joint 123 is a beam with an outer contour shape of a right triangle, and the inside of the beam is of a multicellular structure, and the beam can be processed by a rolling process, an aluminum profile or casting process and the like; the joint 123 shown in fig. 10 (a) has a first "sun" shaped cross-section beam 1241 at one end and a first "C" shaped cross-section beam 1242 at the other end, and the cross-sectional shape of the joint can be adjusted to meet different structural performance requirements; as shown in fig. 10 (b), the joint 123 is provided with a first right-angle side 1245 for connection with the upper reinforcement plate 110, the joint 123 is provided with a sloping side 1247 for connection with the seat cross member end face 146, and the joint 123 is provided with a second right-angle side 1246 for connection with the joint connection face 125 of the vehicle body connection plate 121.
The hollow double-thread bolt 500 is processed by materials such as aluminum alloy, steel or cast iron; as shown in fig. 11, the hollow double-threaded bolt 500 has a two-section concentric cylindrical hollow structure, the outer diameter of the first cylinder 508 is smaller than that of the second cylinder 507, and a first step 501 is formed at the joint of the two sections of cylinders and is used for being matched and connected with the flange side a143 of the integrated floor 140 and the flange side B151 of the lower reinforcing plate 150; the outer cylindrical surface of the first cylinder 508 is provided with a first external thread 502, the inner cylindrical surface is provided with a first internal thread 503, the bottom of the second cylinder 507 is provided with a sealing groove A506 for installing a sealing ring A257; the bottom of the second cylinder 507 is provided with a hexagonal countersunk hole 505 for the assembly of the hollow double threaded bolt 500.
As shown in fig. 12, the first right-angle side 1245 of the joint 123 is connected to the lower surface of the end portion of the upper reinforcing plate 110 by welding or structural adhesive; the bevel edge 1247 of the joint 123 is connected with the seat beam end face 146 through structural adhesive; the second right-angle side 1246 of the joint 123 is connected with the joint connection surface 125 of the vehicle body connection plate 121 by welding or structural adhesive; the connection plates 1222 of the reinforcing connection plate 122 are connected by welding or structural adhesive after being attached to the upper surface of the end part of the upper reinforcing plate 110 from top to bottom; the flange 1221 of the reinforcement web 122 is connected to the joint surface 125 of the vehicle body web 121 by welding or structural adhesive.
As shown in fig. 13, the lower vehicle body 300 is provided with a plurality of welding bolts 400 at the corresponding connection positions of the integrated vehicle body floor 100, and after the connection of the integrated vehicle body floor 140 and the lower vehicle body 300 is matched with the through hole a144 through the first step 501, the first external threads 502 are detachably and fixedly connected with the welding bolts 400; the seat beam assembly 101 is connected with the lower vehicle body 300, and after being matched with the through hole A144 and the through hole C152 through the first step 501, the first external thread 502 is detachably and fixedly connected with the welding bolt 400; one end of the connecting joint 120 is connected with the seat cross beam assembly 101, the other end is connected with the threshold beam 302, and the vehicle body connecting surface 124 of the vehicle body connecting plate 121 is connected with the threshold beam 302 through welding or structural adhesive; the body gasket 130 is installed between the lower body 300 and the flange a143 of the integrated floor for securing the air tightness of the lower body. The connection joint 120 optimizes the connection of the seat beam assembly 101 and the threshold beam 302, reduces the influence of the stress of the seat beam assembly 101 on the battery pack lower case 200, and improves the side collision performance of the vehicle body.
As shown in fig. 14, the battery pack lower case 200 includes five major parts of a lower case frame 210, a diagonal cable device 260, a middle lifting lug 250, a liquid cooling system 220 and a bottom guard plate 230; the liquid cooling system 220 and the lower box frame 210 are matched to form an opening cavity for accommodating the battery cell; two ends of the inclined cable device 260 are connected with the lower box frame 210, and the middle is connected with the liquid cooling system 220, so as to reduce deformation of the liquid cooling system 220 after being stressed; the bottom guard 230 has a flange C235 (fig. 25) at its edge for connection to the lower housing frame 210; the frame around the lower box frame 210 is provided with a plurality of through holes G2116 and H2118, and is connected with the integrated vehicle body floor 100 through flange bolts B258 after being matched with the hollow double-threaded bolts 500; the intermediate lifting lug 250 is used for connection of the first beam 215 to the seat beam assembly 101.
As shown in fig. 15, the lower case frame 210 is formed by splicing six frames with a Z-shaped outer contour and two cross beams with a mouth-shaped outer contour; the frame with Z-shaped outer contour and the cross beam with the Z-shaped outer contour are of multi-cell structures, and can be formed by roll bending, extrusion, casting, welding and other processes; the six specific frames with Z-shaped outer contours comprise two first frames 211, two second frames 212, a third frame 213 and a fourth frame 214, which are welded end to form a closed polygonal frame structure 217; because the cross section shapes of the frames are the same, the die can be shared during processing, so that the manufacturing cost is reduced; the first beam 215 and the second beam 216 are parallel to the third frame 213 and the fourth frame 214, and both ends are welded or bonded to the polygonal frame structure 217 through beam connection joints 218 (fig. 17).
As shown in fig. 16 (a) and (b), the Z-shaped frame is formed by welding or bonding a second C-shaped cross-section beam 2111, a second ri-shaped cross-section beam 2112 and a second ri-shaped cross-section beam 2113 in this order from the outside to the inside of the lower case 200 of the battery pack; the upper connecting surface 2115 of the second C-shaped cross-section beam is provided with a through hole G2116, the lower connecting surface 2117 of the second C-shaped cross-section beam is provided with a through hole H2118, the through hole G2116 is concentric with the through hole H2118, and the diameter of the through hole G2116 is larger than that of the through hole H2118 and is used for being matched with the hollow double-threaded bolt 500; the bottom of the cross beam 2112 with the second cross section in the shape of Chinese character 'ri' is provided with a bottom guard plate connecting surface 2119 for matching connection with the bottom guard plate 230; the second "mouth" section beam 2113 is provided with a liquid cooling system connection surface 2110 for connection with the liquid cooling system 220; the second "sun" shaped cross-section beam 2112 of the first frame 211 has a blind rivet nut mounting hole 2114 provided in the lower case body for mounting the blind rivet nut 270.
As shown in fig. 17, in the cross beam structure in the shape of a "kou", two ends of the first cross beam 215 and the second cross beam 216 are respectively connected with the polygonal frame structure 217 through cross beam connection joints 218, and the cross beam connection joints 218 are used for optimizing the connection of the cross beams and enhancing the structural performance of the lower box body 200 of the battery pack; the first cross member 215 is provided with a through hole I219 in the height direction of the lower case of the battery pack for cooperation with the sleeve 254 of the intermediate shackle.
As shown in fig. 18, the inclined cable device 260 includes two basket bolts 261, four hooks 262, two eye bolts 263, one eye nut 264 and a bracket 265, and the tail of the hook 262 is provided with threads for connecting with the basket bolts 261; the two ends of a turnbuckle 261 are respectively matched and connected with a lifting hook 262 to form a diagonal cable 266, one end of the diagonal cable 266 is connected with a lifting screw 263, and the other end is connected with a lifting nut 264.
Fig. 19 is a schematic structural view of the bracket 265, wherein the bracket 265 is formed by welding or integrally forming a cylinder a2651 and a bottom plate a2652, and a second external thread 2653 is arranged on the outer cylindrical surface of the cylinder a2651 and is used for being matched and connected with the eye nut 264.
As shown in fig. 20, the intermediate lifting lug 250 includes a T-nut 251, a seal ring B252, a support block 253, a sleeve 254, a seal ring C255, and a flange bolt a256; the middle lifting lug 250 is used for connecting the battery pack lower box body 200 with the seat beam assembly 101, so that the structural performance of the battery pack lower box body 200 is ensured.
As shown in fig. 21, the T-nut 251 is welded or integrally formed by a hollow cylinder 2512 and a bottom plate B2511, and the inner cylindrical surface of the hollow cylinder 2512 is provided with a second internal thread 2513 for mating connection with the flange bolt a 256.
As shown in fig. 22, the supporting block 253 has a cylindrical structure with a countersunk through hole 2533 at the center, for limiting the distance between the first cross member 215 and the integrated body floor 100; the upper connecting surface 2532 of the supporting block is provided with a sealing groove B2531 for installing a sealing ring B252; the countersunk through holes 2533 are adapted to mate with the sleeve 254.
As shown in fig. 23, the sleeve 254 has a hollow stepped shaft structure, a second step 2542 of the sleeve 254 is used for being connected with the supporting block 253, and a third step 2543 of the sleeve is used for being connected with the lower liquid cooling plate 222 of the liquid cooling system 220; the bottom of the sleeve 254 is provided with a sealing groove C2544 for installing a sealing ring C255; the sleeve 254 is provided with a through hole J2541 for engagement with the flange bolt a 256.
As shown in fig. 24 (a), the liquid cooling system 220 includes an upper liquid cooling plate 221, a lower liquid cooling plate 222, a water inlet pipe 223, and a water outlet pipe 224; the upper liquid cooling plate 221 is made of aluminum alloy material, and the upper liquid cooling plate 221 is provided with a water outlet 225 and a water inlet 226 for installing a water outlet pipe 223 and a water inlet pipe 224 respectively; the upper liquid cooling plate 221 is provided with a through hole K227 for being matched with the sleeve 254 of the middle lifting lug; the upper liquid cooling plate is provided with a through hole L228 for being matched with a bracket 265 of the inclined cable device 260; the lower liquid cooling plate 222 is made of metal material or composite material, and the lower liquid cooling plate 222 is provided with a runner 229 for flowing cooling liquid; as shown in fig. 24 (b), the lower liquid cooling plate 222 is provided with a through hole M2210 for cooperation with the sleeve 254 of the intermediate lifting lug 250; the lower liquid cooling plate 222 is provided with a through hole N2211 for being matched with a bracket 265 of the inclined cable device 260; through hole K227 is concentric with through hole M2210, and through hole L228 is concentric with through hole N2211; the lower liquid cooling plate is provided with a flange D2212 for connecting the liquid cooling system 220 with the polygonal frame 217; the upper liquid cooling plate 221 and the lower liquid cooling plate 222 are connected together through welding or structural adhesive to form a liquid cooling plate for guiding the flow of the cooling liquid, and the liquid cooling plate has the functions of heat dissipation, heating and heat preservation on the electric core in the battery pack.
The bottom guard plate 230 is made of metal material, composite material or mixed material; as shown in fig. 25, a boss 232 is provided at the middle part of the bottom guard plate 230, and a through hole O234 is provided at the center of the boss 232 for cooperation with a flange bolt a256; the bottom guard plate 230 is provided with a plurality of reinforcing ribs C231 for enhancing the structural performance of the bottom guard plate; the bottom shield edge is provided with a flange C235 for connection to the polygonal frame structure 217.
FIG. 26 is an assembled view of the liquid cooling system, bottom shield and polygonal frame structure, wherein the flange D2212 of the lower liquid cooling plate is welded or glued after being lapped with the liquid cooling system connection surface 2110 of the second cross-section beam in the shape of a Chinese character 'kou'; the flange edge C235 of the bottom guard plate is joined by welding, structural adhesive or hot melt self-tapping 240 after mating with the bottom guard plate joining surface 2119 of the second "Japanese" section beam.
As shown in fig. 27 (a) and (b), after the upper liquid cooling plate 221 of the liquid cooling system is matched with the bottoms of the beams (the first beam 215 and the second beam 216), the beams are connected by welding or structural adhesive; the sleeve 254 of the middle lifting lug 250 sequentially passes through the through hole M2110, the through hole K227 and the through hole I219 from bottom to top and then is connected with the first cross beam 215 through welding or structural adhesive; the third step 2543 of the sleeve is in fit connection with the lower liquid cooling plate 222, so that the connection between the liquid cooling system 220 and the first cross beam 215 is enhanced; the boss 232 of the bottom guard plate is in contact connection with the connecting surface 2545 at the bottom of the sleeve, and the sealing groove C2544 is provided with a sealing ring C255 for ensuring the air tightness of the connecting position.
As shown in fig. 28 (a) and (b), the eye screws 263 at two ends of the inclined cable device 260 are respectively connected with the rivet nut mounting holes 2114 of the two first cross beams 215 in a matching way through rivet nuts 270; after the cylinder A2651 of the bracket sequentially passes through the through hole N2211 and the through hole L228 from bottom to top, the bottom plate A2652 of the bracket is in contact connection with the lower liquid cooling plate 222; the suspension nut 264 is matched with the second external thread 2653 of the cylinder A to connect the inclined cable device 260 with the liquid cooling system 220; the pretightening force of the inclined cable device 260 is controlled by adjusting the turnbuckle 261 bolt, so that the deformation of the liquid cooling system 220 after being stressed is reduced; the small size of the chute device 260 can be used to replace the arrangement of the battery pack cross beam, thereby improving the volume utilization of the battery pack box.
As shown in fig. 29 (a) and (b), after the heat-conducting structural adhesive is coated on the bottoms of the plurality of electric cores 600, the electric cores are arranged in the open cavity for accommodating the electric cores, a certain gap is reserved between the electric cores and the open cavity, the gap between the electric cores and the open cavity is filled by pouring the filling material 700 into the open cavity, and after the filling material 700 is solidified, the electric cores 600 and the battery pack lower box 200 are fixedly connected into a whole, so that the connection between the electric cores and the battery pack lower box is realized without a module, the structural performance and the volume utilization rate of the battery pack box are improved, and the number of parts of the battery pack is reduced; the chute assembly 260 is poured into the filler material 700 to form a reinforced concrete-like structure that further enhances the structural performance of the lower case of the battery pack.
As shown in fig. 30 (a) and (b), after the bottom of a plurality of electric cores 600 is coated with heat-conducting structural adhesive and then arranged in an open cavity for accommodating the electric cores, a certain gap is reserved between every two electric cores, after the embedded pipes 800 are arranged at the position where the gap between the electric cores 600 and the open cavity is larger, filling materials 700 are poured into the open cavity to fill the gap between the electric cores 600 and the open cavity, so that the space where the gap is larger forms a cavity 900, and the consumption of the filling materials 700 is reduced, thereby achieving the purpose of saving cost; the cross-sectional shape of the embedded pipe 800 can be flexibly designed according to the size of the gap and the performance requirement, and can be a composite material or a metal material.
As shown in fig. 31 (a), (B), and (c), after the hollow cylinder 2512 of the T-nut 251 sequentially passes through the through hole P111, the through hole B147, and the through hole D154 from top to bottom, the T-nut bottom plate B2511 is connected with the upper reinforcing plate 110 by welding or structural adhesive; after the first cross beam 215 and the sleeve 254 of the lower battery pack box body are installed, the supporting block 253 and the sleeve 254 are concentrically matched, then the lower connecting surface 2535 of the supporting block is in contact connection with the upper connecting surface of the first cross beam, the lower battery pack box body is moved from bottom to top to enable the countersunk through hole 2533 of the supporting block to be concentrically matched with the hollow cylinder 2512, and finally the flange bolt A265 sequentially passes through the through hole O234 and the through hole J2541 from bottom to top and then is matched with the second internal thread 2513 of the T-shaped nut, so that the detachable fixedly connection between the lower battery pack box body 200 and the seat cross beam assembly 101 is completed; the pretightening force applied by the flange bolt A256 is matched with the sealing ring B252 and the sealing ring C255 to ensure the air tightness of the joint; by the connection mode, the lower battery pack box 200 and the transverse seat assembly 101 can be detachably and fixedly connected, so that the battery pack has good maintainability.
As shown in fig. 32 (a) and (b), the movement of the battery pack lower case 200 from bottom to top causes the through-holes G2116 of the polygonal frame structure 217 to be concentrically engaged with the hollow double-threaded bolts 500; the diameter of the through hole G2116 is slightly larger than the outer diameter of the second cylinder 507 of the hollow double-threaded bolt, the diameter of the through hole H2118 is smaller than the outer diameter of the second cylinder 507 of the hollow double-threaded bolt, and the bottom of the second cylinder 507 of the hollow double-threaded bolt passes through the through hole G2116 to be in contact connection with the second C-shaped section beam 2111; the flange bolt B258 penetrates through the through hole H2118 from bottom to top and then is matched and connected with the first internal thread 503 of the hollow double-thread bolt, so that the polygonal frame structure 217 is detachably and fixedly connected with the vehicle body floor 100; the pretightening force applied by the flange bolt B258 is matched with the sealing ring A257 to ensure the air tightness of the joint; a battery pack lower box sealing gasket 160 is arranged between the flange A143 of the integrated floor and the polygonal frame structure 217, so that the air tightness of the battery pack lower box is ensured; through the connection mode, the detachable fixation of the lower box body of the battery pack and the integrated vehicle body floor can be realized, so that the battery pack has good maintainability.
The examples are preferred embodiments of the present invention, but the present invention is not limited to the above-described embodiments, and any obvious modifications, substitutions or variations that can be made by one skilled in the art without departing from the spirit of the present invention are within the scope of the present invention.

Claims (8)

1. An integrated structure of automobile body and battery package under integrated electric automobile, its characterized in that includes:
the integrated vehicle body floor (100) is formed by sequentially connecting an upper reinforcing plate (110), an integrated floor (140) and a lower reinforcing plate (150) from top to bottom into a whole; the integrated floor (140) is provided with a plurality of seat cross beams (142) at corresponding automobile seat installation positions, and the cross sections of the seat cross beams (142) and the upper reinforcing plate (110) in the length direction of the automobile body are the same; the seat beam (142), the upper reinforcing plate (110) and the lower reinforcing plate (150) form a seat beam assembly (101); both ends of the seat beam assembly (101) are provided with connecting joints (120);
the battery pack lower box body (200) comprises a lower box body frame (210), a diagonal cable device (260), middle lifting lugs (250), a liquid cooling system (220) and a bottom guard plate (230), wherein the liquid cooling system (220) and the lower box body frame (210) are matched to form an opening cavity for accommodating a battery cell, two ends of the diagonal cable device (260) are connected with the lower box body frame (210), the middle is connected with the liquid cooling system (220), and the bottom guard plate (230) is connected with the lower box body frame (210); the lower box body frame (210) is connected with the integrated vehicle body floor (100); the middle lifting lug (250) is connected with the first beam (215) and the seat beam assembly (101);
the inclined cable device (260) comprises two turnbuckle bolts (261), four lifting hooks (262), two lifting ring screws (263), a lifting ring nut (264) and a bracket (265), wherein two ends of one turnbuckle bolt (261) are respectively connected with one lifting hook (262) in a matched manner to form an inclined cable (266), one end of the inclined cable (266) is connected with the lifting ring screw (263), the other end of the inclined cable is connected with the lifting ring nut (264), and the bottom end of the lifting ring nut (264) is connected with the bracket (265) in a matched manner;
the middle lifting lug (250) comprises a T-shaped nut (251), a sealing ring B (252), a supporting block (253), a sleeve (254), a sealing ring C (255) and a flange bolt A (256); the T-shaped nut (251) is connected with the flange bolt A (256) in a matched mode; the supporting block (253) is of a cylindrical structure with a countersunk through hole (2533) in the center, and the countersunk through hole (2533) is used for being matched with the sleeve (254); the sleeve (254) is of a hollow stepped shaft structure, a second step (2542) of the sleeve (254) is connected with the supporting block (253), a sealing groove C (2544) is formed in the bottom of the sleeve (254) and used for installing the sealing ring C (255), and a through hole J (2541) is formed in the sleeve (254) and used for being matched with the flange bolt A (256);
the integrated car body floor (100) is connected with the floor connecting surface of the lower car body (300), and after the integrated car body floor (100) is matched with the battery pack lower box body (200), a sealing cavity for accommodating the battery cell is formed.
2. The integrated structure of the lower body and the battery pack of the integrated electric automobile according to claim 1, wherein the connection joint (120) includes a joint (123), a reinforcing connection plate (122) and a body connection plate (121), the reinforcing connection plate (122) being connected to a joint connection face (125) of the body connection plate (121); one end of the joint (123) is a first cross section beam (1241) in a shape like a Chinese character 'ri', the other end of the joint is a first cross section beam (1242) in a shape like a Chinese character 'ri', the upper end of the first cross section beam (1241) is connected with the upper reinforcing plate (110), the side edge of the first cross section beam (1241) in a shape like a Chinese character 'ri) is connected with the joint connecting surface (125) of the vehicle body connecting plate (121), and the bevel edge (1247) of the first cross section beam (1242) in a shape like a Chinese character' ri is connected with the end face (146) of the seat cross beam; the reinforcing connection plate (122) is provided with a connection plate (1222) with the same cross section shape as the upper reinforcing plate (110) in the length direction of the vehicle body, and the connection plate (1222) is connected with the upper reinforcing plate (110); the upper ends of the first cross section beam (1241) and the first cross section beam (1242) are connected with the upper reinforcing plate (110).
3. The integrated structure of the lower body and the battery pack of the integrated electric automobile according to claim 1, wherein the lower case frame (210) is formed by splicing a frame in a "Z" shape and a cross beam in a "mouth" shape; the Z-shaped frame is formed by connecting a second C-shaped section beam (2111), a second Y-shaped section beam (2112) and a second opening-shaped section beam (2113) in sequence from the outer side to the inner side of the lower box body (200) of the battery pack; the upper and lower connecting surfaces of the second C-shaped section beam (2111) are respectively provided with a through hole for being matched with the hollow double-thread bolt (500); the bottom of the second cross section beam (2112) is provided with a bottom guard plate connecting surface (2119) for being matched and connected with the bottom guard plate (230); the second cross-section beam (2113) is provided with a liquid cooling system connection surface (2110) for connection with the liquid cooling system (220).
4. The integrated structure of the lower body of the integrated electric automobile and the battery pack according to claim 3, wherein the lower battery pack box (200) is connected with the integrated automobile body floor (100) through a hollow double-threaded bolt (500), the hollow double-threaded bolt (500) is of a two-section concentric cylindrical hollow structure, and a first step (501) is formed at the joint of the two sections of cylinders; the two sections of concentric cylinders comprise a first cylinder (508) and a second cylinder (507), the outer cylindrical surface of the first cylinder (508) is provided with a first external thread (502), the inner cylindrical surface is provided with a first internal thread (503), and the bottom of the second cylinder (507) is provided with a sealing groove A (506) and a hexagonal countersink (505).
5. The integrated structure of the lower body and the battery pack of the integrated electric automobile according to claim 1, wherein the integrated floor (140) is provided with a plurality of reinforcing ribs a (145) in the height direction of the battery pack, and the lower reinforcing plate (150) is provided with a plurality of reinforcing ribs B (153) at positions corresponding to the seat cross beam (142).
6. The integrated structure of the lower body and the battery pack of the integrated electric automobile according to claim 1, wherein a plurality of electric cells (600) are arranged in the opening cavity, a gap is reserved between each electric cell (600) and the opening cavity, and a filling material (700) is poured in the gap.
7. The integrated structure of the lower body and the battery pack of the integrated electric automobile according to claim 6, wherein the embedded pipe (800) is arranged in the gap, and when the filling material (700) is poured, a cavity (900) is formed at the embedded pipe (800).
8. The integrated structure of the lower body and the battery pack of the integrated electric vehicle according to claim 3, wherein the integrated floor (140), the upper reinforcement plate (110), the lower reinforcement plate (150), the reinforcement connection plate (122) and the bottom protection plate (230) are all processed from a composite material or a metal material or a mixed material.
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