CN114571975A - Vehicle battery unit and vehicle underbody including the same - Google Patents

Vehicle battery unit and vehicle underbody including the same Download PDF

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Publication number
CN114571975A
CN114571975A CN202111400985.3A CN202111400985A CN114571975A CN 114571975 A CN114571975 A CN 114571975A CN 202111400985 A CN202111400985 A CN 202111400985A CN 114571975 A CN114571975 A CN 114571975A
Authority
CN
China
Prior art keywords
cooling water
water hose
joint
vehicle
battery
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202111400985.3A
Other languages
Chinese (zh)
Inventor
金相完
金勍暭
陈贤垂
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hyundai Motor Co
Kia Corp
Original Assignee
Hyundai Motor Co
Kia Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hyundai Motor Co, Kia Corp filed Critical Hyundai Motor Co
Publication of CN114571975A publication Critical patent/CN114571975A/en
Pending legal-status Critical Current

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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
    • 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
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
    • H01M10/6567—Liquids
    • 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
    • B60K17/00—Arrangement or mounting of transmissions in vehicles
    • B60K17/22—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or type of main drive shafting, e.g. cardan shaft
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
    • B60L58/26—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries by cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D21/00—Understructures, i.e. chassis frame on which a vehicle body may be mounted
    • B62D21/17—Understructures, i.e. chassis frame on which a vehicle body may be mounted forming fluid or electrical conduit means or having other means to accommodate the transmission of a force or signal
    • 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
    • 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
    • B62D25/2009—Floors or bottom sub-units in connection with other superstructure subunits
    • B62D25/2036—Floors or bottom sub-units in connection with other superstructure subunits the subunits being side panels, sills or pillars
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00—Liquid cooling
    • F01P3/12—Arrangements for cooling other engine or machine parts
    • 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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6556—Solid parts with flow channel passages or pipes for heat exchange
    • 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
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
    • H01M10/6567—Liquids
    • H01M10/6568—Liquids characterised by flow circuits, e.g. loops, located externally to the cells or cell casings
    • 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
    • H01M50/262—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders with fastening means, e.g. locks
    • H01M50/264—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders with fastening means, e.g. locks for cells or batteries, e.g. straps, tie rods or peripheral frames
    • 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
    • H01M50/289—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by spacing elements or positioning means within frames, racks or packs
    • 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
    • B60K11/00—Arrangement in connection with cooling of propulsion units
    • B60K11/02—Arrangement in connection with cooling of propulsion units with liquid cooling
    • 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
    • B60K2001/003—Arrangement or mounting of electrical propulsion units with means for cooling the electrical propulsion units
    • B60K2001/005—Arrangement or mounting of electrical propulsion units with means for cooling the electrical propulsion units the electric storage means
    • 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
    • B60K2001/0405—Arrangement or mounting of electrical propulsion units of the electric storage means for propulsion characterised by their position
    • B60K2001/0422—Arrangement under the front seats
    • 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
    • B60K2001/0405—Arrangement or mounting of electrical propulsion units of the electric storage means for propulsion characterised by their position
    • B60K2001/0438—Arrangement under the floor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2050/00—Applications
    • F01P2050/22—Motor-cars
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2050/00—Applications
    • F01P2050/24—Hybrid vehicles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane

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

Abstract

The invention relates to a vehicle battery unit and a vehicle underbody including the same, the vehicle battery unit includes a lower case, a battery module, a cooling block, at least one cooling water hose, and an upper case; the lower case includes a pair of battery housing portions disposed at both lateral sides of the vehicle, and a connecting portion disposed between the pair of battery housing portions and bent to protrude upward; the battery modules are respectively mounted in a pair of battery receiving parts; the cooling block is disposed under the battery module, and receives and discharges cooling water to cool the battery module; at least one cooling water hose configured to exchange cooling water with the cooling block; the upper case is disposed on the lower case and includes a cooling water hose joint unit configured to connect a cooling water hose to the cooling block.

Description

Vehicle battery unit and vehicle underbody including the same
Technical Field
The present invention relates to a vehicle battery unit and a vehicle underbody including the same, and more particularly, to a vehicle battery unit that can be mounted on a lower portion of a vehicle center floor and a vehicle underbody including the same.
Background
An electric vehicle (e.g., a hybrid vehicle, a fuel cell vehicle, or an electric vehicle) is designed to be driven using an electric motor, and the electric vehicle is provided with a high-voltage battery unit configured to store therein driving electric energy to be supplied to the electric motor.
In general, a high-voltage battery cell may include a case defining a closed inner space in the high-voltage battery cell and a plurality of battery cells accommodated in the case, and may further include a Battery Management System (BMS) configured to perform control to monitor a voltage, a current, a temperature, etc. of a battery module and the battery cells of the battery module arranged in the closed inner space in the case, thereby managing the battery according to the monitoring result.
In order to mount the high-voltage battery module to the electric vehicle, there are a way to mount the high-voltage battery module in a trunk or a trunk of the vehicle and a way to mount the high-voltage battery module from the outside to a lower portion of a center floor of a vehicle body.
In the case where the high-voltage battery unit is installed in a trunk or a trunk room, there is a disadvantage in that it is difficult to install components (e.g., spare tires) required for the vehicle in the space, since the amount of space in the trunk or the trunk room is reduced. In particular, in the case of a Sport Utility Vehicle (SUV) or a utility vehicle (MPV), there is a disadvantage in that it is difficult to mount a third row seat or to achieve a completely flat arrangement using a space in a luggage compartment.
In the case where the high-voltage battery unit is mounted to the lower portion of the central floor of the vehicle, although it is possible to optimally utilize the space in the trunk or the trunk, there are disadvantages in that: it is difficult to secure a space for arranging a propeller shaft configured to transmit power from a power system (an engine and a motor) mounted to a front side of a vehicle to rear wheels. As described above, in the case where the high-voltage battery unit is externally mounted to the lower portion of the center floor of the vehicle, a rear wheel drive motor must be additionally mounted on the vehicle to achieve All Wheel Drive (AWD). However, since the size of a space for accommodating the rear wheel drive motor is limited, it is impossible to increase the size of the rear wheel drive motor, and thus there is a disadvantage in enhancing the power of the vehicle.
The details described as background are only intended to facilitate an understanding of the background of the invention and should not be construed as an admission of prior art that is previously known to a person of ordinary skill in the art.
Disclosure of Invention
Accordingly, the present invention provides a vehicle battery unit that is mounted to a lower portion of a vehicle center floor and is capable of transmitting power from a power system provided on a front side of a vehicle to rear wheels, and a vehicle underbody including the vehicle battery unit.
In accordance with the present invention, the above and other objects can be accomplished by the provision of a vehicle battery unit including a lower case, a battery module, a cooling block, at least one cooling water hose, and an upper case; the lower case includes a pair of battery housing portions disposed at both lateral sides of the vehicle, and a connecting portion disposed between the pair of battery housing portions and bent to protrude upward; the battery modules are respectively mounted in a pair of battery receiving parts; the cooling block is disposed under the battery module, and receives and discharges cooling water to cool the battery module; at least one cooling water hose configured to exchange cooling water with the cooling block; the upper case is disposed on the lower case and includes a cooling water hose joint unit configured to connect a cooling water hose to the cooling block.
In an embodiment of the present invention, the cooling water hose joint unit may include: a cooling water hose joint, a joint, and a sealing bracket, at least one end of the cooling water hose being joined to the cooling water hose joint in a lateral direction, and the cooling water hose joint being configured to communicate with the cooling water hose at a lower side; connected to one of the cooling blocks at one end of the joint, a lower portion of the cooling water hose joint being forcibly fitted and connected into the other end of the joint; a sealing bracket is disposed between the cooling water hose joint and an outer surface of the upper case, and has a first tube hole therein through which the cooling water hose joint and the joint extend.
In an embodiment of the present invention, the cooling water hose joint may include: a hose engaging portion to which the cooling water hose is connected in a lateral direction, a lower communication portion, and a housing engaging portion; a lower communication portion extending downward from the hose engaging portion and communicating with the hose engaging portion; the housing coupling portion extends in a direction perpendicular to the lower communication portion, and has a first fixing hole therein, which is vertically formed through the housing coupling portion, to fix the cooling water hose joint to the upper housing.
In an embodiment of the present invention, the cooling water hose joint may further include at least one O-ring provided at one end of the lower communication part fitted into the other end of the joint, thereby achieving a water-tight seal between the joint and the lower communication part.
In an embodiment of the present invention, one end of the joint may be fixed to one of the cooling blocks by brazing.
In an embodiment of the present invention, the seal holder may further include a protrusion protruding from an inner circumferential surface of the first pipe hole toward a center of the first pipe hole, the protrusion being configured to press a portion of the joint disposed in the first pipe hole.
In an embodiment of the present invention, the sealing bracket may further include a post head protruding upward from an upper surface of the sealing bracket, the post head being used to position the cooling water hose joint before assembling the cooling water hose joint.
In an embodiment of the present invention, the seal holder may have a shape corresponding to a shape of the housing engagement portion when viewed in a plan view, and may have a second fixing hole formed through a region of the seal holder corresponding to the first fixing hole.
In an embodiment of the present invention, the upper case may include: a second pipe hole formed through a region of the upper case corresponding to the first pipe hole, and through which the cooling water hose joint and the joint extend; a blind rivet nut is fitted in a region of the upper case corresponding to the second fixing hole, and the cooling water hose engaging member and the sealing bracket may be fixed to the upper case by threadedly engaging a bolt extending through the first and second pipe holes with the blind rivet nut.
In an embodiment of the present invention, the upper case may further include a patch structure attached to an inner surface area of the upper case where the cooling water hose joint and the sealing bracket are fixed.
According to another aspect of the present invention, there is provided a vehicle underbody including a vehicle center floor and a battery unit, the battery unit including: the cooling device comprises a lower shell, a battery module, a cooling block, at least one cooling water hose and an upper shell; the lower case is disposed below the center floor and includes a pair of battery housing portions disposed on both lateral sides of the vehicle and a connecting portion that is disposed between the pair of battery housing portions and is bent to protrude upward and that defines a mounting space between the pair of battery housing portions below the connecting portion; the battery modules are respectively mounted in a pair of battery receiving parts; the cooling block is disposed under the battery module, and receives and discharges cooling water to cool the battery module; at least one cooling water hose configured to exchange cooling water with the cooling block; the upper case is disposed on the lower case and includes a cooling water hose joint unit configured to connect the cooling water hose to the cooling block, wherein a transmission shaft of a vehicle is disposed in the installation space.
Drawings
The above and other objects, features and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:
fig. 1 is an exploded perspective view showing a battery unit and surrounding vehicle components according to an embodiment of the present invention;
fig. 2 is a bottom view showing a state where the components shown in fig. 1 are engaged with each other as viewed from below;
fig. 3 is a side view showing a state where the components shown in fig. 1 are engaged with each other as viewed from the side;
FIGS. 4 and 5 are cross-sectional views taken along lines I-I and II-II of FIG. 2, respectively;
fig. 6 is a perspective view illustrating a battery cell according to an embodiment of the present invention, viewed from above;
fig. 7 is a schematic view illustrating a region corresponding to a cooling water hose joint unit of a battery cell according to an embodiment of the present invention;
fig. 8 is an exploded perspective view of a cooling water hose joint unit of a battery unit according to an embodiment of the present invention;
fig. 9 and 10 are schematic views illustrating portions of a cooling water hose joint unit forming an upper case of a battery cell according to an embodiment of the present invention, when viewed from above and below, respectively;
fig. 11 is a side sectional view of a cooling water hose joint unit of a battery unit according to an embodiment of the present invention;
FIG. 12 is an exploded perspective view of a front cross member and a rear cross member disposed in a vehicle floor according to an embodiment of the present invention;
fig. 13 is a bottom perspective view showing a state in which front and rear cross members provided in a vehicle bottom according to an embodiment of the invention are joined to a center floor; and
fig. 14 and 15 are schematic views showing examples of structures for joining a front cross member to a seat cross member according to an embodiment of the present invention.
Detailed Description
It should be understood that the term "vehicle" or "vehicular" or other similar terms as used herein generally includes motor vehicles such as passenger automobiles including Sport Utility Vehicles (SUVs), buses, trucks, various commercial vehicles, watercraft including a variety of boats, ships, aircraft, and the like, and includes hybrid vehicles, electric vehicles, plug-in hybrid electric vehicles, hydrogen-powered vehicles, and other alternative fuel vehicles (e.g., fuels derived from non-petroleum sources). As referred to herein, a hybrid vehicle is a vehicle having two or more power sources, such as both gasoline-powered and electric-powered vehicles.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, values, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, values, steps, operations, elements, components, and/or groups thereof. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. Throughout this specification, unless explicitly described to the contrary, the word "comprise", and variations such as "comprises" or "comprising", will be understood to imply the inclusion of stated elements but not the exclusion of any other elements. In addition, the terms "unit," "device," "means," and "module" described in the specification mean a unit for performing at least one of functions and operations, and may be implemented by hardware components or software components, and a combination thereof.
Further, the control logic of the present application may be embodied as a non-transitory computer readable medium on a computer readable medium containing executable program instructions for execution by a processor, controller, or the like. Examples of computer readable media include, but are not limited to, ROM, RAM, Compact Disc (CD) -ROM, magnetic tape, floppy disk, flash drive, smart card, and optical data storage device. The computer readable medium CAN also be distributed over a Network coupled computer system so that the computer readable medium is stored and executed in a distributed fashion, for example, by a telematics server or Controller Area Network (CAN).
Hereinafter, a vehicle battery unit and a vehicle underbody including the same according to some embodiments of the present invention will be described in detail with reference to the accompanying drawings.
First, a battery cell and a battery cell mounting structure according to an embodiment of the present invention will be described with reference to fig. 1 to 6.
Fig. 1 is an exploded perspective view showing a battery unit and surrounding vehicle components according to an embodiment of the present invention. Fig. 2 is a bottom view showing a state where the components shown in fig. 1 are engaged with each other as viewed from below. Fig. 3 is a side view showing a state where the components shown in fig. 1 are engaged with each other as viewed from the side. Fig. 4 and 5 are sectional views taken along line i-i and line ii-ii of fig. 2, respectively. Fig. 6 is a perspective view illustrating a battery cell according to an embodiment of the present invention as viewed from above.
Referring to fig. 1 to 6, the battery unit according to the embodiment of the present invention may be configured such that a propeller shaft 320, which is fixedly disposed at a lower portion of a central floor 210 of a vehicle and constitutes a driving unit 300, extends forward and backward through the battery unit 100 so as to transmit power to the rear wheels 230.
The battery cell 100 may include a battery case including an upper case 110a and a lower case 110b defining a closed inner space therebetween, a battery module 120, a cooling block 125, at least one cooling water hose 170, and a Battery Management System (BMS) 130; the battery module 120 is fixedly mounted in the closed inner space in the battery case; the cooling block 125 is disposed under the battery modules 120, and the cooling block 125 receives and discharges cooling water to cool the battery modules 120; at least one cooling water hose 170 is configured to exchange cooling water with the cooling block 125; the Battery Management System (BMS)130 is configured to monitor and manage voltage, current, temperature, etc. of the battery module 120 or the battery cells of the battery module 120.
The lower case 110b of the battery unit 100 according to the embodiment of the present invention may be divided into two battery receiving parts 140 and a connecting part 150, the two battery receiving parts 140 being arranged in the lateral direction of the vehicle and receiving the battery module 120 in the battery receiving parts 140, the connecting part 150 being bent at a point between the two battery receiving parts 140 to protrude upward and connect the two battery receiving parts 140 to each other.
The upper case 110a may cover the lower case 110b from above to define a closed inner space between the upper case 110a and the lower case 110 b. The upper case 110a may be configured to have a shape corresponding to the shape of the upper end of the lower case 110 b.
The upper case 110a may include a cooling water hose joint unit 180, the cooling water hose joint unit 180 being configured to supply cooling water to the cooling block 125 and to be connected to the cooling water hose 170, the cooling water from the cooling block 125 being discharged through the cooling water hose 170.
Each battery module 120 may include a plurality of battery cells electrically connected to each other. The voltage of each battery module 120 may be determined according to the series/parallel connection of a plurality of battery cells included in the battery module 120.
Since some embodiments of the present invention are configured such that two battery modules 120 are respectively arranged in two battery receiving parts 140 spaced apart from each other by connection parts 150, and the BMS130 is mounted to one of the two battery receiving parts 140, high-voltage wires connected to the battery modules 120 received in one of the two battery receiving parts 140 need to extend to the other battery receiving part 140. In this case, the high voltage electric wire may be arranged along the connection part 150, and the connection part 150 connects the two battery receiving parts 140 to each other.
The battery unit 100 may be fixed to a lower portion of a center floor 210 of the vehicle from the outside, and the center floor 210 may be provided with a center tunnel 211, the center tunnel 211 being bent to protrude upward and extend in the front-rear direction of the vehicle.
The battery cell 100 may be configured such that the battery receiving parts 140 of the battery cell 100 are located at both lateral sides of the central passage 211. The connection part 150 may be bent to protrude upward together with the central passage 211 of the central floor panel 210 such that the connection part 150 is mounted to the central floor panel 210 in a state of being fitted into the central passage 211.
In other words, the connection part 150 may be configured to connect upper portions of the two battery receiving parts 140 located at both lateral sides of the central passage 211 to each other, and be disposed in the central passage 211 at a protruding portion of the central passage and along the central passage 211. The connection part 150 may be provided with a mounting space 160 in the connection part 150, the mounting space 160 extending between the two battery receiving parts 140 and being open in the front and rear.
According to an embodiment of the present invention, the propeller shaft 320 constituting the driving unit 300 of the vehicle may be disposed in the installation space 160. In other words, since the battery unit 100 according to the embodiment of the present invention is configured such that the installation space 160 is disposed below the case, it is possible to secure a space in which the propeller shaft 320 is disposed even when the battery unit 100 is installed to the lower portion of the center floor 210, the propeller shaft 320 being configured to transmit power from the power system 310 located at the front of the vehicle to the rear wheels.
The battery unit 100 according to an embodiment of the present invention may include a cooling unit configured to cool the battery modules 120 disposed in the battery receiving part 140. The battery unit 100 according to the embodiment of the present invention may be provided with the cooling block 125, and the cooling block 125 is disposed under the battery module 120 to be in surface contact with the battery module 120 to exchange heat therebetween, thereby cooling the battery module 120. The cooling block 125 may include a pair of cooling blocks 125, and the pair of cooling blocks 125 are disposed in the pair of battery receiving parts 140, respectively.
Cooling water is introduced into the cooling block 125 and then discharged from the cooling block 125 to obtain desired cooling performance. To this end, the battery cell 100 according to an embodiment of the present invention may include a cooling water hose 170 for introducing cooling water into the cooling block 125 and discharging the cooling water from the cooling block 125.
The cooling water hose 170 may include a hose configured to supply cooling water to the cooling block 125, through which the cooling water flows by a component (e.g., a compressor) mounted to a cooling pipe configured to circulate the cooling water, and a hose configured to discharge the cooling water circulated through the cooling block 125 from the cooling block 125. The cooling water hose 170 and the cooling block 125 may communicate with each other via a cooling water hose joint unit 180 provided at the upper case 110a such that the cooling water flows between the cooling water hose 170 and the cooling block 125.
Next, the structure of the cooling water hose joint unit provided at the vehicle battery unit according to some embodiments of the present invention will be described in detail with further reference to fig. 7 to 11.
Fig. 7 is a schematic view illustrating a region corresponding to a cooling water hose joint unit of a battery cell according to an embodiment of the present invention. Fig. 8 is an exploded perspective view of a cooling water hose joint unit of a battery unit according to an embodiment of the present invention. Fig. 9 and 10 are schematic views showing portions of a cooling water hose joint unit forming an upper case of a battery unit according to an embodiment of the present invention, when viewed from above and below, respectively. Fig. 11 is a side sectional view of a cooling water hose joint unit of a battery unit according to an embodiment of the present invention.
The cooling water hose joint unit 180 may include: a cooling water hose joint 181, a joint 183, and a sealing bracket 182, at least one end of the cooling water hose 170 being joined to the cooling water hose joint 181 in the lateral direction, and the cooling water hose joint 181 being configured to communicate with a cooling water hose located therebelow; one end of the joint 183 is connected to the cooling block 125, and the lower portion of the cooling water hose joint 181 is forcibly fitted and connected to the other end of the joint 183; the sealing bracket 182 is disposed between the cooling water hose joint 181 and the outer surface of the upper case 110a and has a tube hole H2 through which the cooling water hose joint 181 and the nipple 183 extend.
The cooling water hose joint 181 may include a hose joint portion 181a to which the cooling water hose 170 is connected in the lateral direction, and a lower communication portion 181b extending downward from the hose joint portion 181a and communicating with the hose joint portion 181 a. Further, the cooling water hose joint 181 may include a case joint part 181c, the case joint part 181c extending in a direction perpendicular to the lower communication part 181b and having a fixing hole H1, the fixing hole H1 being vertically formed through the case joint part 181c to fix the cooling water hose joint 181 to the upper case 110 a.
The cooling water hose 170 may be coupled to the hose coupling portion 181 a. Since the hose engaging portion 181a of the cooling water hose joint 181, through which the cooling water is introduced into the cooling block 125 disposed in one of the pair of battery housing portions 140 and discharged from the cooling block 125, must be connected to the cooling water hose, through which the cooling water is introduced into the cooling block 125 disposed in the other of the pair of battery housing portions 140 and discharged from the cooling block 125, the cooling water hose joint 181 may be configured such that two cooling water hoses are joined to both sides of the cooling water hose joint 181. Meanwhile, the hose engaging portion 181a (through which cooling water is introduced into the cooling block 125 disposed in the other of the pair of battery receiving portions 140 and discharged from the cooling block 125) may be configured such that the cooling water hose 170 is connected to only one side of the hose engaging portion 181 a.
The lower communication part 181b may be configured to communicate with the hose coupling part 181a in a downward direction such that the cooling water flowing through the cooling water hose 170 connected to the hose coupling part 181a is transferred to a component therebelow, or such that the cooling water in the lower component is supplied to the cooling water hose 170 connected to the hose coupling part 181 a.
One end of the lower communication part 181b may be configured to be forcibly fitted into the joint 183 such that the cooling water is supplied to the joint 183 and the cooling water flowing through the joint 183 is transferred to the cooling water hose 170. In order to prevent the cooling water between the lower communication portion 181b and the joint 183 from leaking, a portion of the lower communication portion 181b forcibly fitted into the joint 183 may be provided with one or more O-rings R1 and R2.
The cooling water hose joint 181 may further include a housing joint portion 181c configured to extend in a direction perpendicular to the lower communication portion 181b, i.e., in a direction parallel to the upper surface of the upper housing 110a, and the cooling water hose joint unit 180 is disposed on the upper housing 110 a. The case coupling portion 181c may have a fixing hole H1, and the fixing hole H1 is vertically formed through the case coupling portion 181c, and thus, the cooling water hose coupling 181 can be fixed to the upper case 110a by a bolt B extending through the fixing hole H1.
One end of the joint 183 may be joined to the cooling block 125 by brazing. Joining the joint 183 to the cooling block 125 by brazing ensures a strong connection structure and prevents leakage between the cooling block 125 and the joint 183.
The sealing bracket 182 may be disposed between the cooling water hose joint 181 and the outer surface of the upper case 110a to prevent the cooling water from flowing into a space defined between the upper case and the lower case, in which the battery module 120 is disposed, when the cooling water leaks.
The sealing bracket 182 may have a tube hole H2 and a fixing hole H3, a portion connecting the joint 183 and the cooling water hose joint 181 is fitted into the tube hole H2, a fixing hole H3 is formed at a position corresponding to the fixing hole H1, and a fixing hole H1 is formed in the case joint portion 181c of the cooling water hose joint 181. Further, the sealing bracket 182 may include a protrusion C protruding from an inner circumferential surface of the tube hole H2 toward the center of the tube hole H2. The protrusion C may press the outer circumferential surface of the joint 183 disposed in the pipe hole H2, thereby preventing the leaked cooling water from entering the space between the upper and lower cases along the outer circumferential surface of the joint 183. Specifically, when leakage of cooling water occurs between the joint 183 and the lower communication portion 181b of the cooling water hose joint 181 due to an unexpected reason, the protrusion C prevents the leaked cooling water from entering the space between the upper and lower cases along the outer circumferential surface of the joint 183, regardless of the plurality of O-rings R1 and R2, and the cooling water flows to the outside of the upper case 110a along the upper surface of the sealing bracket 182.
The sealing bracket 182 may have a shape corresponding to the shape of the case engagement portion 181c of the cooling water hose engagement 181 when viewed from above, and thus may have a fixing hole H3 formed at a position corresponding to a fixing hole H1 formed through the case engagement portion 181 c. Further, the sealing bracket 182 may be provided with a post head S on an upper surface of the sealing bracket 182, the post head S being configured to position the cooling water hose joint 181 when the cooling water hose joint unit 180 is assembled. By virtue of the stud S, the cooling water hose joint unit 180 can be positioned before being fastened by bolts.
In addition, the tube hole H4 may be formed through a region of the upper case 110a where the cooling water hose joint unit 180 is formed such that the joint 183 is exposed to the outside of the upper case 110a, and a through hole may be formed through a region of the upper case 110a near the tube hole H4 corresponding to the fixing holes H1 and H3. The blind rivet nut N can be fitted into the upper case 110a through each of the through holes.
The cooling water hose joint 181 and the sealing bracket 182 may be joined to the upper case only by a fastening operation of threading the bolts B through the fixing holes H1 and H3 with the blind rivet nut N. According to the embodiment of the present invention, since the cooling water hose engaging piece 181 and the sealing bracket 182 are simultaneously engaged as described above, it is possible to ensure a sufficient clamping force with respect to the O-ring and the sealing bracket using an axial force at the time of assembly, thereby having an advantage of ensuring a reliable sealing performance.
According to an embodiment of the present invention, the upper case 110a may further include a patch structure 184, the patch structure 184 being attached to an inner surface area of the stationary cooling water hose joint 181 and the sealing bracket 182 of the upper case 110 a. The patch structure 184 can not only increase the rigidity of the cooling water hose joint unit 180, but also achieve a strong sealing structure by providing a sufficient clamping force against the sealing bracket 182.
Next, a vehicle bottom according to an embodiment of the invention will be described with reference to the remaining drawings.
Fig. 12 is an exploded perspective view of a front cross member and a rear cross member provided in a vehicle bottom according to an embodiment of the present invention. Fig. 13 is a bottom perspective view illustrating a state in which a front cross member and a rear cross member provided in a vehicle bottom according to an embodiment of the present invention are joined to a center floor. Fig. 14 and 15 are schematic views showing examples of structures for joining the front cross member to the seat cross member according to the embodiment of the invention.
Drive unit 300 of a vehicle may include a powertrain 310 and a prop shaft 320, powertrain 310 including an engine and a motor, and prop shaft 320 configured to transmit power from powertrain 310.
The power system 310 may be fixedly mounted to the sub-frame 220 located at the front side of the vehicle, and the propeller shaft 320 may be connected to the power system 310 at one end of the propeller shaft 320 and may extend in the front-rear direction of the vehicle. As described above, the transmission shaft 320 may be disposed in the installation space 160 of the connection part 150 of the battery unit 100. Although not shown, an exhaust pipe extending in the rearward direction of the vehicle from the power system 310 may also be arranged in the installation space 160.
As is well known in the art, a propeller shaft 320 of the vehicle is a component configured to transmit power from the powertrain 310 to the rear wheels 230. Since the power generated by the power system 310 is transmitted to the rear wheels 230 via the propeller shaft 320, the rear wheels 230 can be driven by the power from the power system 310 mounted to the front side of the vehicle.
Since the battery cells 100 are mounted to the lower portion of the central floor panel 210, the front and rear cross members 400 and 500 are fixedly mounted to the lower portion of the central floor panel 210 at the front and rear sides of the battery cells 100, respectively.
Since the front cross member 400 and the rear cross member 500 extend in the lateral direction of the vehicle and are connected to the side sills 240 at both ends of the front cross member 400 and the rear cross member 500 in the lateral direction of the vehicle, a load path toward the side sills 240 can be provided.
The front cross member 400 may be connected to the rear end of the front side member 250 to form a load path capable of transmitting load to the front side member 250, and the rear cross member 500 may be connected to the front end of the rear side member 260 to form a load path capable of transmitting load to the rear side member 260.
Since the front cross member 400 and the rear cross member 500 are connected to vehicle components (e.g., a center floor, side sills, front side members, and rear side members), it is possible to increase the rigidity of the vehicle, thereby improving R & H (Ride and Handling) performance and suppressing NVH (Noise, Vibration, and Harshness).
Since the battery unit 100 mounted to the lower portion of the center floor 210 at the outside of the vehicle is surrounded at the outer periphery of the battery unit 100 by the side sills 240 located at both lateral sides of the vehicle and the front and rear cross members 400 and 500 located at the front and rear sides of the vehicle, the battery unit 100 can be positioned at a predetermined position defined between the side sills 240 located at both lateral sides of the vehicle and the front and rear cross members 400 and 500 located at the front and rear sides of the vehicle. Further, the battery unit 100 may be configured to be sufficiently protected from the impact in the front-rear direction and the lateral direction of the vehicle.
Since the driving shaft 320 of the driving unit 300, which is arranged to extend through the mounting space 160 of the connection part 150, is mounted to at least one of the front cross member 400, the rear cross member 500, and the battery unit 100, an increased coupling force may be provided.
The seat cross member 270 may extend in the lateral direction and may be joined to an upper portion of the center floor 210. The front cross member 400 may be arranged to vertically overlap the seat cross member 270 with the center floor 210 interposed between the front cross member 400 and the seat cross member 270. Accordingly, since the seat cross member 270 overlaps the front cross member 400 in the vertical direction, it is possible to ensure further improved durability and thus further increase the strength and rigidity of the vehicle body.
Alternatively, the front cross member 400 may be disposed forward or rearward of the seat cross member 270 and may be connected to the seat cross member 270 by a flange 271 of the seat cross member 270 and a flange 401 of the front cross member 400, with the center floor 210 interposed between the flange 271 of the seat cross member 270 and the flange 401 of the front cross member 400.
Each of the front cross member 400 and the rear cross member 500 may include a pair of side members 410, 510 and a connection member 420, 520 connecting the pair of side members 410, 510 to each other.
Each of the side members 410 and 510 may extend approximately linearly, and may have a U-shaped cross section. Each of the connection members 420 and 520 may be configured to have an upwardly convex channel shape and may have a U-shaped cross-section, like the side members 410 and 510.
Each of the connection members 420 and 520 may be disposed in the central channel 211 of the central floor 210 and may be installed in the central channel 211 of the central floor 210.
Both outer ends of each of the side members 410 and 510 may be connected to the side sill 240 of the vehicle to form a lateral load path, and both inner ends of each of the side members 410 and 510 may be joined to both ends of each of the connecting members 420 and 520 in an overlapped state, thereby providing increased joining force.
Each of the side members 410 and 510 and the connection members 420 and 520 may be configured to have a U-shaped section that is opened upward, and the flanges 411 and 421, 511 and 521 formed at the edges of the opened portions may be in surface contact with the lower surface of the center floor 210, thereby defining the closed space 280 between the center floor 210 and the side sill 240 and the side members 410 and 510 and the connection members 420 and 520. Accordingly, by virtue of the closed space 280, the strength and rigidity of the vehicle body can be further increased.
Both ends of each of the connection members 420 and 520 may be provided with respective engagement surfaces 422 and 522 to which the propeller shaft 320 is engaged, and both sides of each of the engagement surfaces 422 and 522 may be provided with respective ribs 423 and 523, which ribs 423 and 523 are connected to the side members 410 and 510.
Although each of the engagement surfaces 422, 522 is preferably configured to have a flat surface to increase the engagement force between the propeller shaft 320 and the engagement surface, the present invention is not limited thereto. Each of the engagement surfaces 422, 522 may be configured to have a surface corresponding to a mounting surface of the propeller shaft 320 to achieve surface contact with the mounting surface of the propeller shaft 320.
Since the ribs 423, 523 of the connection member 420, 520 may be connected to the side member 410, 510, the rigidity of the portion connecting the connection member 420, 520 and the side member 410, 510 may be further increased by the ribs 423, 523.
Reinforcing brackets 430, 530 may be joined to the inner surface of each of side members 410 and 510. The first reinforcing brackets 430 coupled to the side members 410 of the front cross member 400 may be coupled to the front ends of the longitudinal members 700, which will be described later, and the second reinforcing brackets 530 coupled to the side members 510 of the rear cross member 500 may be coupled to the rear ends of the longitudinal members 700.
Since the first reinforcing brackets 430 are coupled to the coupling portions between the front cross member 400 and the longitudinal member 700 and the second reinforcing brackets 530 are coupled to the coupling portions between the rear cross member 500 and the longitudinal member 700, the rigidity of the coupling portions can be further increased.
The second reinforcing brackets 440, 540 may be coupled to the coupling surfaces 422, 522 of the coupling members 420, 520, and the driving shaft 320 is coupled to the coupling members 420, 520 to increase the rigidity of the coupling portions.
The battery unit 100 mounted to the lower portion of the center floor 210 at the outside of the vehicle may be supported by the plurality of cross members 600 and the plurality of longitudinal members 700 at the lower portion of the battery unit 100, and the battery unit 100 may be connected to the vehicle body.
In other words, a plurality of cross members 600 extending laterally and spaced apart from each other in the front-rear direction are joined to the lower surface of the battery receiving part 140, and a plurality of longitudinal members 700 extending in the front-rear direction are joined to the lower surface of the battery receiving part 140, respectively. The vehicle bottom may further include a connecting portion reinforcing member 800, the connecting portion reinforcing member 800 being recessed into and engaged with the connecting portion 150 and extending forward and rearward along the mounting space 160.
The cross member 600 may be disposed across the longitudinal members 700. Here, the cross member 600 may be connected to the side sill 240 of the vehicle at one end of the cross member 600 and to the connecting portion reinforcing member 800 at the other end of the cross member 600 to form a lateral load path.
In addition, the cross member 600 may also be connected to the side members 700 to form a front-to-back load path.
Alternatively, the cross members 600 may be disposed at both lateral sides of the longitudinal member 700, respectively, such that ends of the cross members 600 are connected to both lateral side portions of the longitudinal member 700, respectively, and the remaining ends of the cross members 600 are connected to the side sill 240 and the connecting portion reinforcing member 800, respectively.
In this structure, since the cross member 600 and the longitudinal member 700 do not overlap each other in the vertical direction, there is an advantage in that the vertical height of the members can be reduced.
Each of the side sills 240 disposed at both lateral sides of the vehicle is configured to have an upper surface 241, a lower surface 242, and a side surface 243 when viewed in a sectional view, and each of both lateral ends of the center floor 210 is connected to the side surface 243 of the side sill 240 such that a receiving space 290 is provided below the center floor 210, the receiving space 290 being defined between the lower surface of the center floor 210 and the side surface 243 of the side sill 240 to open downward.
The battery receiving part 140 of the battery unit 100 is located in the receiving space 290 such that the upper portion of the battery receiving part 140 is received in the receiving space 290 and the lower portion of the battery receiving part 140 protrudes downward from the side members 240.
By the mounting structure of the battery housing part 140, the center floor 210 can be lowered as close to the ground as possible, so that a sufficiently large passenger compartment can be ensured. Further, since most of the upper end of the battery receiving part 140 is located in the receiving space 290, the distance between the road surface and the battery receiving part 140 can be sufficiently increased.
As described above, the vehicle battery unit and the vehicle underbody including the same according to some embodiments of the present invention are configured such that the battery unit 100 for an electric vehicle is externally and fixedly mounted to the lower portion of the center floor 210 of the vehicle. Accordingly, since the trunk can be utilized to the maximum, there is an advantage of improving marketability.
Further, the vehicle battery unit according to some embodiments of the present invention and the vehicle bottom including the same are configured such that the battery unit 100 is mounted to the lower portion of the center floor 210, and such that the propeller shaft 320 constituting the driving unit 300 of the vehicle extends through the mounting space 160 of the connecting portion 150 between the two battery receiving portions 140 to transmit power from the power system 310 to the rear wheel 230. Accordingly, since an additional motor for driving the rear wheel is not used, there are advantages in that the manufacturing cost and weight are reduced and the fuel efficiency is improved.
Further, the vehicle battery unit according to some embodiments of the invention and the vehicle bottom including the same are configured such that the battery unit 100 mounted to the lower portion of the center floor 210 is connected to components of the vehicle body (e.g., the side members 240, the front side members 250, and the rear side members 260) via the cross members 600, the longitudinal members 700, the front cross member 400, and the rear cross member 500. Accordingly, since the rigidity of the vehicle body is increased, it is possible to improve R & H (running and handling) performance and suppress NVH (noise, vibration, and harshness).
As apparent from the above description, in a vehicle battery unit and a vehicle bottom including the same according to some embodiments of the present invention, since the battery unit is externally and fixedly mounted to a lower portion of a center floor of a vehicle, it is possible to maximally utilize a trunk or a trunk, thereby providing an effect of improving merchantability.
In particular, since the battery unit is mounted to the lower portion of the center floor, and since a space for mounting a driving shaft constituting the vehicle driving unit to transmit power to the rear wheels of the vehicle is secured, four-wheel drive can be achieved even without using an additional motor for driving the rear wheels, thereby providing effects of reducing manufacturing costs and weight and improving fuel efficiency.
Further, in the vehicle battery unit and the vehicle bottom including the same according to some embodiments of the invention, since the battery unit mounted to the lower portion of the center floor is connected to components of the vehicle body (e.g., the side members, the front side members, and the rear side members) via the cross members, the longitudinal members, the front cross member, and the rear cross member, there is an effect of improving R & H (running and handling) performance of the vehicle and suppressing NVH (noise, vibration, and harshness).
Further, in the vehicle battery unit and the vehicle bottom including the same according to some embodiments of the invention, there is an effect of further improving the sealing performance of the cooling water hose joint unit configured to supply cooling water to the battery unit.
Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and deletions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

Claims (20)

1. A vehicle battery unit, comprising:
a lower case including a pair of battery housing portions disposed at both lateral sides of a vehicle, and a connection portion disposed between the pair of battery housing portions and bent to be convex upward;
battery modules mounted in the pair of battery receiving parts, respectively;
a cooling block disposed under the battery module, and receiving and discharging cooling water to cool the battery module;
at least one cooling water hose configured to exchange cooling water with the cooling block; and
an upper case disposed on the lower case and including a cooling water hose joint unit configured to connect the cooling water hose to the cooling block.
2. The vehicle battery unit according to claim 1, wherein the cooling water hose joint unit includes:
a cooling water hose joint to which at least one end of the cooling water hose is joined in a lateral direction and which is configured to communicate with the cooling water hose at a lower side;
a joint connected to one of the cooling blocks at one end thereof and having the other end thereof configured to receive a lower portion of the cooling water hose joint, the lower portion of the cooling water hose joint being forcibly fitted and connected to the other end of the joint; and
a sealing bracket disposed between the cooling water hose joint and an outer surface of the upper case, and having a first tube hole therein through which the cooling water hose joint and the joint extend.
3. The vehicle battery unit according to claim 2, wherein the cooling water hose joint includes:
a hose engaging portion to which the cooling water hose is connected in a lateral direction;
a lower communication portion extending downward from the hose engaging portion and communicating with the hose engaging portion; and
a housing coupling part extending in a direction perpendicular to the lower communication part and having a first fixing hole therein, the first fixing hole being vertically formed through the housing coupling part to fix the cooling water hose coupling to the upper housing.
4. The vehicle battery unit according to claim 3, wherein the cooling water hose joint further comprises at least one O-ring provided at one end of the lower communication part fitted into the other end of the joint, thereby achieving a water-tight seal between the joint and the lower communication part.
5. The vehicle battery unit according to claim 2, wherein one end of the tab is fixed to one of the cooling blocks by brazing.
6. The vehicle battery unit according to claim 2, wherein the seal holder further includes a protrusion protruding from an inner peripheral surface of the first tube hole toward a center of the first tube hole, the protrusion being configured to press a portion of the tab disposed in the first tube hole.
7. The vehicle battery unit according to claim 2, wherein the sealing bracket further includes a post head protruding upward from an upper surface of the sealing bracket for positioning the cooling water hose joint before assembling the cooling water hose joint.
8. The vehicle battery unit according to claim 3, wherein the seal holder has a shape corresponding to a shape of the case engagement portion when viewed in a plan view, and has a second fixing hole formed through a region of the seal holder corresponding to the first fixing hole.
9. The vehicle battery unit of claim 8, wherein the upper case comprises:
a second pipe hole formed through a region of the upper case corresponding to the first pipe hole, and through which the cooling water hose joint and the joint extend; and
a blind rivet nut fitted in a region of the upper case corresponding to the second fixing hole,
wherein the cooling water hose engaging member and the sealing bracket are fixed to the upper case by threadedly engaging bolts passing through the first and second pipe holes with the blind rivet nuts.
10. The vehicle battery unit of claim 9, wherein the upper case further comprises a patch structure attached to an inner surface area of the upper case that secures the cooling water hose joint and the sealing bracket.
11. A vehicle underbody, comprising:
a central floor of the vehicle; and
a battery unit including a lower case, a battery module, a cooling block, at least one cooling water hose, and an upper case; the lower case is disposed below the center floor and includes a pair of battery housing portions disposed on both lateral sides of the vehicle and a connecting portion that is disposed between the pair of battery housing portions and is bent to protrude upward and that defines a mounting space between the pair of battery housing portions below the connecting portion; the battery modules are respectively mounted in a pair of battery receiving parts; the cooling block is disposed under the battery module, and receives and discharges cooling water to cool the battery module; at least one cooling water hose configured to exchange cooling water with the cooling block; the upper case disposed on the lower case and including a cooling water hose joint unit configured to connect the cooling water hose to the cooling block,
wherein a drive shaft of the vehicle is arranged in the installation space.
12. The vehicle underbody according to claim 11, wherein the cooling water hose joint unit comprises:
a cooling water hose joint to which at least one end of the cooling water hose is joined in a lateral direction and which is configured to communicate with the cooling water hose at a lower side;
a joint connected to one of the cooling blocks at one end thereof and having the other end thereof configured to receive a lower portion of the cooling water hose joint, the lower portion of the cooling water hose joint being forcibly fitted and connected to the other end of the joint; and
a sealing bracket disposed between the cooling water hose joint and an outer surface of the upper case, and having a first tube hole therein through which the cooling water hose joint and the joint extend.
13. The vehicle underbody according to claim 12, wherein the cooling water hose joint comprises:
a hose engaging portion to which the cooling water hose is connected in a lateral direction;
a lower communication portion extending downward from the hose engaging portion and communicating with the hose engaging portion; and
a case coupling part extending in a direction perpendicular to the lower communication part and having a first fixing hole therein, the first fixing hole being vertically formed through the case coupling part to fix the cooling water hose coupling to the upper case.
14. The vehicle bottom according to claim 13, wherein the cooling water hose joint further comprises at least one O-ring provided at one end of the lower communication part fitted into the other end of the joint, thereby achieving a water-tight seal between the joint and the lower communication part.
15. The vehicle underbody according to claim 12, wherein one end of the joint is fixed to one of the cooling blocks by brazing.
16. The vehicle underbody according to claim 12, wherein the seal holder further comprises a protrusion protruding from an inner peripheral surface of the first pipe hole toward a center of the first pipe hole, the protrusion configured to press a portion of the joint disposed in the first pipe hole.
17. The vehicle underbody according to claim 12, wherein the seal carrier further comprises a stud protruding upward from an upper surface of the seal carrier for positioning the cooling water hose joint before assembling the cooling water hose joint.
18. The vehicle bottom according to claim 13, wherein the seal holder has a shape corresponding to a shape of the case engaging portion when viewed in a plan view, and has a second fixing hole formed through a region of the seal holder corresponding to the first fixing hole.
19. The vehicle bottom of claim 18, the upper housing comprising:
a second pipe hole formed through a region of the upper case corresponding to the first pipe hole, and through which the cooling water hose joint and the joint extend; and
a blind rivet nut fitted in a region of the upper case corresponding to the second fixing hole,
wherein the cooling water hose engaging member and the sealing bracket are fixed to the upper case by threadedly engaging a bolt extending through the first and second pipe holes with the blind rivet nut.
20. The vehicle underbody according to claim 19, wherein the upper case further comprises a patch structure attached to an inner surface area of the upper case that fixes the cooling water hose joint and the seal bracket.
CN202111400985.3A 2020-11-30 2021-11-24 Vehicle battery unit and vehicle underbody including the same Pending CN114571975A (en)

Applications Claiming Priority (2)

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