CN113363648A - Modularization battery package lower box body suitable for quick service and quick change - Google Patents
Modularization battery package lower box body suitable for quick service and quick change Download PDFInfo
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- CN113363648A CN113363648A CN202110602253.6A CN202110602253A CN113363648A CN 113363648 A CN113363648 A CN 113363648A CN 202110602253 A CN202110602253 A CN 202110602253A CN 113363648 A CN113363648 A CN 113363648A
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- frame
- module bracket
- battery pack
- box body
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- 230000008439 repair process Effects 0.000 claims abstract description 13
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- 238000005096 rolling process Methods 0.000 claims description 8
- 229910000861 Mg alloy Inorganic materials 0.000 claims description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 7
- 230000001681 protective effect Effects 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- 238000005452 bending Methods 0.000 claims description 5
- 238000009434 installation Methods 0.000 claims description 3
- 229910000838 Al alloy Inorganic materials 0.000 claims description 2
- 229910000851 Alloy steel Inorganic materials 0.000 claims description 2
- 238000013461 design Methods 0.000 abstract description 7
- 239000000463 material Substances 0.000 description 12
- 238000004519 manufacturing process Methods 0.000 description 8
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- 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
- H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
- H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
- H01M50/209—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for prismatic or rectangular cells
-
- 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
- H01M50/233—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions
- H01M50/24—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions adapted for protecting batteries from their environment, e.g. from corrosion
-
- 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
-
- 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
- H01M50/258—Modular batteries; Casings provided with means for assembling
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Battery Mounting, Suspending (AREA)
Abstract
The invention provides a modular battery pack lower box body suitable for quick repair and quick change, which comprises n equal-sized basic units, wherein each n basic units comprise a frame structure, n-1 cross beams, n pool module brackets and n bottom guard plates; the frame structure is formed by connecting 4 same frames end to end, the shape of the cross-section outer contour of the frame is in an inverted L shape, and the inner part of the frame is in a multi-cavity structure; the beam is in an inverted-V-shaped structure; the battery module bracket is formed by connecting 4 identical battery module bracket frames end to end, the shape of the cross section outer contour of the battery module bracket frame is L-shaped, and the inside of the battery module bracket frame is of a multi-cavity structure; the crossbeam welded fastening is structural at the frame, and battery module bracket is located frame structure below, and is connected with frame structure and crossbeam, and end backplate is located battery module bracket below, and is connected with frame structure and crossbeam. The invention realizes quick repair and quick change of the battery module from the bottom of the battery pack box body, and the platformization and modular design of the battery pack.
Description
Technical Field
The invention belongs to the technical field of forming, and particularly relates to a modular battery pack lower box body suitable for quick repair and replacement.
Background
The improvement of batteries of electric vehicle module, from traditional 355 module to 390 module to 590 modules, the battery module volume is constantly increasing, and the volume utilization ratio of battery package box is also constantly improving. With the continuous development of battery module technology, new technologies such as CTP, blade batteries and large modules appear. The appearance of novel battery module technique has had higher technical requirement to battery package box structure, and how the battery package box can realize the quick-witted fast maintenance of battery module and the modularized design of battery package box and become a present big difficult problem under the prerequisite that is applicable to novel battery module technique.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the modularized battery pack lower box body suitable for quick repair and quick change, and the battery module is disassembled and assembled from the bottom of the battery pack box body, and the battery pack is designed to be flat and modularized.
The present invention achieves the above-described object by the following technical means.
A modular battery pack lower box body suitable for quick repair and quick change comprises n equal-size basic units, wherein each n basic units comprise a frame structure, n-1 cross beams, n battery module brackets and n bottom guard plates;
the frame structure is formed by connecting 4 same frames end to end, the shape of the cross-section outer contour of each frame is inverted L-shaped, and the inner part of each frame is of a multi-cavity structure; a battery module bracket connecting surface A and a rivet nut mounting hole B are arranged at the downward position in the middle of the frame and are used for being connected with a battery module bracket; the bottom end of the frame is provided with a bottom protection plate connecting surface A and a rivet nut mounting hole C which are used for connecting with the bottom protection plate;
the beam is of an inverted-V-shaped structure; the battery module bracket connecting surface B and the rivet nut mounting hole D are arranged on the two side flanges of the upper part of the cross beam and are used for being connected with the battery module bracket; the bottom of the beam is provided with a bottom guard plate connecting surface B and symmetrical rivet nut mounting holes E which are used for connecting with the bottom guard plate;
the battery module bracket is formed by connecting 4 identical battery module bracket frames end to end, the shape of the cross section outer contour of the battery module bracket frame is L-shaped, and the interior of the battery module bracket frame is of a multi-cavity structure; the middle of the battery module bracket frame, which faces upwards, is provided with a battery module joint face and a rivet nut mounting hole F for connecting with a battery module; the bottom of the frame of the battery module bracket is provided with a through hole and a sleeve limiting surface, and the through hole is matched with the sleeve and then connected with the frame structure;
the periphery of the bottom guard plate is provided with an installation part for connecting the frame structure and the cross beam;
wherein n is more than or equal to 2.
In the technical scheme, the sleeve consists of a cylindrical hollow structure and an opening blocking piece, a through hole is formed in the center of the opening blocking piece and is concentric with an inner hole of the cylindrical hollow structure, and the bottom end of the cylindrical hollow structure is fixed with the opening blocking piece; the diameter of the inner hole of the cylindrical hollow structure is 1-3mm larger than that of the rivet nut.
Among the above-mentioned technical scheme, bottom guard plate is equipped with first strengthening rib upwards along battery package direction of height on the surface, is equipped with the second strengthening rib downwards along battery package direction of height.
In the above technical solution, the bottom guard plate sealing ring is arranged on the upper portion of the bottom guard plate.
In the technical scheme, the top end of the frame is provided with the upper cover connecting surface and the rivet nut mounting hole A for being connected with the upper cover of the battery pack.
In the technical scheme, the lateral part of the cross beam is provided with the lightening hole.
In the above technical scheme, the two ends of the cross beam are provided with notches.
In the technical scheme, the frame structure, the cross beam, the battery module bracket, the bottom protection plate and the sleeve are made of steel, aluminum and magnesium alloy, the frame structure, the cross beam and the battery module bracket are processed through bending, rolling, extruding or casting processes, the bottom protection plate is processed through a stamping or casting process, and the sleeve is processed through rolling, extruding or casting processes.
The invention has the beneficial effects that:
1) the base unit in the structure can realize the installation mode of the power battery module from bottom to top, realize quick repair and quick change of the battery pack, avoid the detachment of the whole battery pack from a vehicle body, facilitate maintenance and realize the design of platformization and modularization of the battery pack. Meanwhile, the quick-repair and quick-change design can realize that the battery module is maintained and damaged independently on the premise of not disassembling the battery pack, so that the time is saved, the water inlet dust and the damage risk of the structural integrity of the vehicle body caused by repeated disassembly and replacement of the battery pack are reduced.
2) The structure of the invention can change the number of the basic units by increasing and decreasing the length and the width of the frame structure of the battery pack and increasing and decreasing the number of the cross beams, thereby realizing the design and the manufacture of platformization and modularization of the battery pack, reducing the production cost and improving the economy.
3) The structure of the invention is suitable for the design and processing manufacture of multi-element materials, fully utilizes the advantages of different materials, improves the performance of the battery pack and reduces the production cost.
4) The structure is suitable for the electric automobile with ultra-long endurance mileage, and meets the development requirements of novel power battery module technologies such as CTP (computer to plate), blade batteries and large modules.
Drawings
Fig. 1 is a perspective view of a lower case shaft of a modular battery pack suitable for quick repair and replacement according to the present invention;
fig. 2 is an exploded view of the lower case of the modular battery pack suitable for quick repair and replacement according to the present invention;
fig. 3 is a schematic structural view of a lower case of a modular battery pack suitable for quick repair and replacement according to another embodiment of the present invention;
fig. 4(a) is a top view of the frame structure of the present invention, fig. 4(b) is a schematic view of the frame structure of the present invention in an inverted L shape, fig. 4(c) is a schematic view of a cross section of the frame of the present invention in an inverted L shape processed by roll bending, fig. 4(d) is a schematic view of a cross section of the frame of the present invention in an inverted L shape processed by extrusion, and fig. 4(e) is a schematic view of a cross section of the frame of the present invention in an inverted L shape processed by casting;
fig. 5(a) is a schematic structural view of the inverted-shaped beam according to the structure of the present invention, and the structure of the present invention of the invention of fig. 5 (fig;
fig. 6(a) is a top view of a battery module bracket structure according to the present invention, fig. 6(b) is a schematic view of an "L" -shaped frame structure according to the present invention, fig. 6(c) is a schematic view of a cross-section of an "L" -shaped frame according to the present invention, and fig. 6(d) is a schematic view of an assembly relationship between a battery module bracket and a battery module according to the present invention;
FIG. 7 is a schematic view of the bottom guard structure of the present invention;
FIG. 8(a) is a schematic view of the assembly of the sleeve of the present invention, and FIG. 8(b) is a schematic view of the explosion of the sleeve of the present invention;
FIG. 9 is a schematic view of a connection relationship between an inverted V-shaped cross beam and a frame structure according to the present invention;
fig. 10(a) is a schematic view of the connection between the battery module bracket and the frame structure according to the present invention, and fig. 10(b) is a schematic view of the connection between the battery module bracket and the inverted-v-shaped cross beam according to the present invention;
FIG. 11(a) is a schematic view of the connection between the bottom guard plate and the frame structure of the present invention, and FIG. 11(b) is a schematic view of the connection between the bottom guard plate and the inverted-V-shaped cross beam of the present invention;
fig. 12 is a schematic view of an assembly relationship between a lower case and a battery module of the modular battery pack suitable for quick repair and replacement according to the present invention;
wherein: 100-frame structure, No. 110-1 frame, 111-rivet nut mounting hole A, 112-rivet nut mounting hole B, 113-rivet nut mounting hole C, 114-upper cover connecting surface, 115-battery module bracket connecting surface A, 116-bottom protective plate connecting surface A, No. 120-2 frame, No. 130-3 frame, No. 140-4 frame, 200-beam, 201-rivet nut mounting hole D, 202-rivet nut mounting hole E, 203-bottom protective plate connecting surface B, 204-battery module bracket connecting surface B, 205-lightening hole, 206-notch, 300-battery module bracket, No. 310-1 battery module bracket frame, 311-rivet nut mounting hole F, 312-through hole, 313-battery module connecting surface, 314-sleeve limiting surface, 315-upper connecting surface, 320-No. 2 battery module bracket frame, 330-No. 3 battery module bracket frame, 340-No. 4 battery module bracket frame, 400-bottom protective plate, 401-first reinforcing rib, 402-bottom protective plate through hole, 403-second reinforcing rib, 404-mounting part, 500-rivet nut, 600-sleeve, 610-cylindrical hollow structure, 620-perforated baffle plate, 700-bolt, 800-bottom protective plate sealing ring and 900-battery module.
Detailed Description
The invention will be further described with reference to the following figures and specific examples, but the scope of the invention is not limited thereto.
As shown in fig. 1 and 2, a modular battery pack lower box suitable for quick repair and replacement comprises a plurality of basic units, wherein two basic units comprise a frame structure 100, a cross beam 200, two battery module brackets 300 and two bottom guard plates 400, and the area of each battery module bracket 300 is slightly smaller than that of each bottom guard plate 400; crossbeam 200 welded fastening is in the intermediate position of frame structure 100, divides frame structure 100 into two parts of equidimension, and battery module bracket 300 is located frame structure 100 and crossbeam 200 below, and is connected through bolt and frame structure 100 and crossbeam 200, and backplate 400 is located battery module bracket 300 below, and is connected through bolt and frame structure 100 and crossbeam 200. When the modular battery pack lower case is in use, the battery module 900 is mounted on the battery module bracket 300; when demolising, demolish apron board 400 earlier, follow battery package direction of height and from down up demolish battery module bracket 300 and battery module 900 down again, avoided dismantling whole battery package from the automobile body, realized the quick-repair quick change to the battery module.
As shown in fig. 3, the length of the frame structure 100 is increased, the number of the beams 200 is increased, the number of the base units is changed, the design and manufacture of the battery pack in a platform and modularization manner are realized, the production cost is reduced, and the economy is improved. There are three basic units in the drawing, which are composed of a frame structure 100, two cross members 200, three battery module brackets 300, and three floor panels 400.
As shown in fig. 4(a), the frame structure 100 includes a frame No. 1, a frame No. 2, a frame No. 3, and a frame No. 4 140 with the same cross-sectional shape, and the frames are welded end to form a closed rectangular frame structure; because the cross sections of the frames have the same shape, the common use of the die can be realized during processing, thereby reducing the manufacturing cost. As shown in fig. 4 b, the outer profile of each frame section has an inverted L-shape, and the inner portion has a multi-cavity structure, and can be formed by roll bending (fig. 4 c), extrusion (fig. 4 d), casting (fig. 4 e), welding, and the like. As shown in fig. 4(c), the specific frame has an upper cover connection surface 114 and a rivet nut mounting hole a111 at the top end for bolting with the upper cover of the battery pack; a battery module bracket connecting surface A115 and a rivet nut mounting hole B112 which are positioned in the middle and are arranged downwards are arranged and are used for being connected with the battery module bracket 300 through bolts; there are a backplate connection face a116 and a blind rivet nut mounting hole C113 at the bottom end for bolting with the backplate 400.
FIG. 5(a) is a schematic structural view of an inverted V-shaped beam; referring to fig. 5(B), the battery module bracket connection surface B204 and the rivet nut mounting hole D201 are provided at both side flanges of the upper portion of the cross beam 200 for bolt connection with the battery module bracket 300; the bottom of the beam 200 is provided with a bottom guard plate connecting surface B203 and two symmetrical rows of rivet nut mounting holes E202 for bolt connection with the bottom guard plate 400; the lateral part of the beam 200 is provided with lightening holes 205 for reducing the weight of the battery pack and improving the energy density. As shown in fig. 5(c), the cross member 200 is provided with cutouts 206 at both ends.
Fig. 6(a) is a top view of a battery module bracket structure, in which a battery module bracket 300 includes a No. 1 battery module bracket frame 310, a No. 2 battery module bracket frame 320, a No. 3 battery module bracket frame 330, and a No. 4 battery module bracket frame 340, which have the same cross-sectional shape, and the end of each battery module bracket frame are welded to form a closed rectangular frame structure; because the cross-sectional shapes of the frames of the battery module brackets are the same, the common use of the die can be realized during processing, thereby reducing the manufacturing cost. Referring to fig. 6(b), the cross-sectional profile of each battery module bracket frame is L-shaped, and the interior of each battery module bracket frame is a multi-cavity structure and can be formed by roll bending, extrusion, casting, welding and other processes. As shown in fig. 6(c), the battery module bracket frame has a battery module contact surface 313 and a rivet nut mounting hole F311, which are disposed upward in the middle, for connecting with a battery module 900 through a rivet nut 500 and a bolt (as shown in fig. 6 (d)); there is a through hole 312 and a sleeve retaining surface 314 at the bottom, the through hole 312 cooperates with the cylindrical hollow structure 610 and the perforated barrier 620 of the sleeve 600 and is bolted to the rim structure 100.
As shown in fig. 7, the bottom guard plate 400 is specifically provided with a first reinforcing rib 401, a second reinforcing rib 403, a bottom guard plate through hole 402 and a mounting portion 404; the first reinforcing ribs 401 are upward along the height direction of the battery pack, so that the ground clearance of the battery pack box body is increased, and the bottom protection performance of the battery pack box body is improved; the second reinforcing ribs 403 are downward in the height direction of the battery pack, so that the strength, rigidity, mode and other properties of the bottom guard plate 400 are improved; the mounting portion 404 is located on the periphery of the bottom guard plate 400, and the bottom guard plate through holes 402 are uniformly distributed in the mounting portion 404 for being connected with the frame structure 100 and the cross beam 200 by bolts.
As shown in fig. 8(a), (b), the sleeve 600 is composed of a cylindrical hollow structure 610 and a tapping baffle 620, the tapping baffle 620 is provided with a through hole at the center and is concentric with the inner hole of the cylindrical hollow structure 610, and the bottom end of the cylindrical hollow structure 610 is connected with the tapping baffle 620 by welding; the diameter of the inner hole of the cylindrical hollow structure 610 is 1-3mm larger than that of the blind rivet nut 500, so that the connection surface 315 on the battery module bracket 300 can be in contact with the bottom protection plate connection surface A116 and the battery module bracket connection surface B204.
Fig. 9 is a schematic view of the connection relationship between the inverted u-shaped cross beam 200 and the frame structure 100 according to the present invention, wherein the cutouts 206 at the two ends of the cross beam 200 are engaged with the battery module bracket connection faces a115, and the two ends of the cross beam 200 are connected to the frame structure 100 by welding or gluing.
As shown in fig. 10(a), the battery module bracket connection face a115 is screwed through the sleeve 600 after being fitted to the upper connection face 315 of the battery module bracket 300; as shown in fig. 10(B), the battery module bracket connection face B204 is screwed through the sleeve 600 after being fitted to the connection face 315 of the battery module bracket 300; the setting of sleeve 600 can prevent that battery module bracket 300 from warping, adopts bolted connection's mode to make things convenient for battery module bracket 300's dismouting, realizes battery module 900's quick-repair quick change.
As shown in fig. 11(a), the bottom guard plate connection surface a116 is sequentially engaged with the bottom guard plate sealing ring 800 and the bottom guard plate 400, and then connected by the blind rivet nut 500 and the bolt 700; as shown in fig. 11(B), the bottom guard plate connection surface B203 is sequentially engaged with the bottom guard plate sealing ring 800 and the bottom guard plate 400 and then connected by the blind rivet nut 500 and the bolt 700; the bottom guard plate sealing ring 800 is arranged to play a role in bottom sealing, the bottom guard plate 400 can be disassembled and assembled in a bolt connection mode, and quick repair and quick change of the battery module 900 are achieved.
In this embodiment, the frame structure 100 may be formed by bending, rolling, extruding, or casting a steel material, an aluminum material, or a magnesium alloy material, the cross beam 200 may be formed by bending, rolling, extruding, or casting a steel material, an aluminum material, or a magnesium alloy material, the battery module bracket 300 may be formed by bending, rolling, extruding, or casting a steel material, an aluminum material, or a magnesium alloy material, the bottom protective plate 400 may be formed by stamping, or casting a steel material, an aluminum material, or a magnesium alloy material, and the sleeve 600 may be formed by rolling, extruding, or casting a steel material, an aluminum material, or a magnesium alloy material.
As shown in fig. 12, the battery module 900 is firstly connected with the battery module bracket 300 through processes of bolting, gluing, etc., secondly the battery module bracket 300 is bolted with the frame structure 100 and the beam 200, and finally the bottom guard plate 400 and the bottom guard plate seal ring 800 are bolted with the frame structure 100 and the beam 200, so as to assemble the lower box body of the modular battery pack and the battery module; the method specifically comprises the following steps:
s1, mounting the battery module 900, and mounting the battery module 900 in the battery module mounting area of the battery module bracket 300;
s2, the sleeve 600 penetrates through the through hole 312 from bottom to top along the height direction of the battery pack, and the battery module bracket 300 provided with the battery module 900 in the S1 is connected with the rivet nut 500 and the bolt 700 through the sleeve 600 from bottom to top along the height direction of the battery pack;
and S3, the bottom guard plate 400 is matched with the rivet nut mounting hole E202 through the bottom guard plate through hole 402, the rivet nut mounting hole C113 and the rivet nut mounting hole E, and then is connected by matching the rivet nut 500 with the bolt 700.
The present invention is not limited to the above-described embodiments, and any obvious improvements, substitutions or modifications can be made by those skilled in the art without departing from the spirit of the present invention.
Claims (10)
1. The lower box body of the modular battery pack suitable for quick repair and quick change is characterized by comprising n equal-size basic units, wherein the n basic units consist of a frame structure (100), n-1 cross beams (200), n pool module brackets (300) and n bottom protective plates (400);
the frame structure (100) is formed by connecting 4 same frames end to end, the shape of the cross-section outer contour of each frame is inverted L-shaped, and the inner part of each frame is of a multi-cavity structure; a battery module bracket connecting surface A (115) and a rivet nut mounting hole B (112) are arranged at the downward position in the middle of the frame and are used for being connected with a battery module bracket (300); the bottom end of the frame is provided with a bottom protection plate connecting surface A (116) and a rivet nut mounting hole C (113) which are used for being connected with the bottom protection plate (400);
the cross beam (200) is of an inverted-V-shaped structure; the battery module bracket connecting surface B (204) and the rivet nut mounting hole D (201) are arranged on two side flanges of the upper part of the cross beam (200) and are used for being connected with a battery module bracket (300); the bottom of the beam (200) is provided with a bottom guard plate connecting surface B (203) and symmetrical rivet nut mounting holes E (202) which are used for connecting with a bottom guard plate (400);
the battery module bracket (300) is formed by connecting 4 identical battery module bracket frames end to end, the shape of the cross-section outer contour of the battery module bracket frame is L-shaped, and the interior of the battery module bracket frame is of a multi-cavity structure; the middle of the battery module bracket frame, which faces upwards, is provided with a battery module connecting surface (313) and a rivet nut mounting hole F (311) which are used for being connected with a battery module (900); the bottom of the frame of the battery module bracket is provided with a through hole (312) and a sleeve limiting surface (314), and the through hole (312) is matched with the sleeve (600) and then connected with the frame structure (100);
the periphery of the bottom protection plate (400) is provided with an installation part (404) which is used for being connected with the frame structure (100) and the cross beam (200);
wherein n is more than or equal to 2.
2. The lower box body of the modular battery pack as claimed in claim 1, wherein the sleeve (600) is composed of a cylindrical hollow structure (610) and a perforated baffle plate (620), the perforated baffle plate (620) is provided with a through hole at the center and is concentric with the inner hole of the cylindrical hollow structure (610), and the bottom end of the cylindrical hollow structure (610) is fixed with the perforated baffle plate (620).
3. The lower case of the modular battery pack according to claim 2, wherein the diameter of the inner hole of the cylindrical hollow structure (610) is 1-3mm larger than that of the blind rivet nut (500).
4. The lower box body of the modular battery pack as claimed in claim 1, wherein the bottom guard plate (400) is provided with a first reinforcing rib (401) on the surface along the height direction of the battery pack and a second reinforcing rib (403) on the surface along the height direction of the battery pack.
5. The lower box body of the modular battery pack as claimed in claim 1, wherein the bottom guard plate (400) is provided with a bottom guard plate sealing ring (800) at the upper part.
6. The lower box body of the modular battery pack as claimed in claim 1, wherein the top end of the frame is provided with an upper cover connection surface (114) and a rivet nut mounting hole A (111) for connecting with the upper cover of the battery pack.
7. The lower case of the modular battery pack as claimed in claim 1, wherein the lateral beam (200) is provided with a lightening hole (205) at a side thereof.
8. The lower case of the modular battery pack as claimed in claim 1, wherein the cross member (200) is provided with a cut-out (206) at both ends.
9. The lower box body of the modular battery pack as claimed in claim 1, wherein the frame structure (100), the cross beam (200), the battery module bracket (300), the bottom guard plate (400) and the sleeve (600) are made of steel, aluminum and magnesium alloy.
10. The modular battery pack lower case of claim 8, wherein the frame structure (100), the cross member (200), and the battery module bracket (300) are manufactured through a bending, rolling, extruding, or casting process, the floor sheathing (400) is manufactured through a stamping or casting process, and the sleeve (600) is manufactured through a rolling, extruding, or casting process.
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Application publication date: 20210907 |