WO2011007501A1 - Battery pack - Google Patents

Battery pack Download PDF

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Publication number
WO2011007501A1
WO2011007501A1 PCT/JP2010/004096 JP2010004096W WO2011007501A1 WO 2011007501 A1 WO2011007501 A1 WO 2011007501A1 JP 2010004096 W JP2010004096 W JP 2010004096W WO 2011007501 A1 WO2011007501 A1 WO 2011007501A1
Authority
WO
WIPO (PCT)
Prior art keywords
battery pack
main body
box main
seal
lid
Prior art date
Application number
PCT/JP2010/004096
Other languages
French (fr)
Inventor
Tadayoshi Hashimura
Masaaki Satou
Original Assignee
Nissan Motor Co., Ltd.
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 Nissan Motor Co., Ltd. filed Critical Nissan Motor Co., Ltd.
Priority to MX2012000593A priority Critical patent/MX2012000593A/en
Priority to US13/383,705 priority patent/US8877364B2/en
Priority to EP10799565.6A priority patent/EP2454770B1/en
Priority to RU2012101460/11A priority patent/RU2483394C1/en
Priority to BR112012000777-7A priority patent/BR112012000777B1/en
Priority to KR1020127001077A priority patent/KR101319116B1/en
Priority to CN201080031827.9A priority patent/CN102473873B/en
Publication of WO2011007501A1 publication Critical patent/WO2011007501A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K1/00—Arrangement or mounting of electrical propulsion units
    • B60K1/04—Arrangement or mounting of electrical propulsion units of the electric storage means for propulsion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • 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
    • B60L50/00—Electric propulsion with power supplied within the vehicle
    • B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
    • B60L50/60—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries
    • B60L50/64—Constructional details of batteries specially adapted for electric vehicles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/244—Secondary casings; Racks; Suspension devices; Carrying devices; Holders characterised by their mounting method
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/249—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders specially adapted for aircraft or vehicles, e.g. cars or trains
    • 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
    • H01M50/271—Lids or covers for the racks or secondary casings
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2200/00—Type of vehicle
    • B60Y2200/90—Vehicles comprising electric prime movers
    • B60Y2200/91—Electric 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

Definitions

  • the present invention relates to a battery pack which houses a battery therein and which is mounted on an electric vehicle or the like.
  • a battery pack for housing multiple batteries is provided to an electric vehicle which travels by using a motor as a drive source.
  • Japanese Patent No. 3199296 discloses a battery pack including a battery box and a lid, and provided under seats on which occupants are seated.
  • the battery box is disposed on the lower side in the battery pack, and has a box shape having a closed bottom.
  • the lid is disposed at the upper side of the battery box.
  • the above-mentioned battery pack has a concern that the sealing performance between the battery box and the lid may be lowered because of the following reason. Specifically, since a mating portion between the battery box and the lid in the battery pack is linear when viewed laterally, the position of the lid is likely to be laterally shifted relative to the battery box during the assembly of the battery box and the lid. As a result, a gap is formed between the battery box and the lid, resulting in the lowering of the sealing performance.
  • the present invention has been made in view of the above-described concern, and an object of the present invention is to provide a battery pack which enables the positional shift during the assembly to be prevented, and a high sealing performance to be maintained.
  • An aspect of the present invention is a battery pack including: a box main body housing a battery therein, the box main body having a box shape with an upper side opening, the box main body having a first seal flange formed along an outer peripheral portion of the box main body; and a lid covering the upper side opening of the box main body, the lid having a second seal flange formed along an outer peripheral portion of the lid, the first and second seal flanges being in contact with each other and sealing the battery pack, wherein the first and second seal flanges are curved with a predetermined curvature.
  • Fig. 1 is a perspective view of a battery pack according to an embodiment of the present invention.
  • Fig. 2 is a front view of the battery pack of Fig. 1.
  • Fig. 3 is a cross-sectional view taken along the III-III line of Fig. 1.
  • Fig. 4 is a cross-sectional view taken along the IV-IV line of Fig. 1.
  • a battery pack 1 includes a box main body 3 and a lid 5.
  • the box main body 3 has a box shape with an upper side opening and a closed bottom.
  • the lid 5 is disposed on the box main body 3, and covers the upper side opening of the box main body 3.
  • the box main body 3 is disposed on a lower side of the battery pack 1.
  • Seal flanges are formed along outer peripheral portions of the upper side opening of the box main body 3 and the lower side opening of the lid 5, respectively. These seal flanges are brought into contact with each other to seal the battery pack 1.
  • a connector attachment bracket 7 is provided to a central portion, in a vehicle width direction, of a front surface of the box main body 3.
  • Attachment brackets 9 are attached to the front surface of the box main body 3 respectively at outer sides, in the vehicle width direction, of the connector attachment bracket 7.
  • the battery pack 1 is supported on a vehicle body member such as a side member 29 (refer to Fig. 4).
  • four attachment brackets 9 are attached to each of right and left side surfaces of the box main body 3.
  • the lid 5 has a first convex portion 11 and a second convex portion 13.
  • the first convex portion 11 is disposed on a front side in a vehicle front-rear direction, and bulged upward.
  • the second convex portion 13 is disposed on a rear side in the vehicle front-rear direction, and bulged upward. These first convex portion 11 and second convex portion 13 are arranged away from each other in the front-rear direction with a predetermined distance therebetween.
  • the seal flange along the outer peripheral portion of the substantially rectangular lower side opening of the lid 5 is formed of a front seal flange 15, a rear seal flange (not shown), and a pair of side seal flanges 17, which are integrated with each other.
  • the front seal flange 15 is disposed on a front side in the vehicle front-rear direction, and extends in the vehicle width direction.
  • the rear seal flange is disposed on a rear side in the vehicle front-rear direction, and extends in the vehicle width direction.
  • the side seal flanges 17 are disposed on outer sides in the vehicle width direction, and extend in the vehicle front-rear direction.
  • Each side seal flange 17 is joined to the front seal flange 15 and the rear seal flange at both edges, in the vehicle front-rear direction, of the side seal flange 17, such that the side seal flange 17 is continuous to the front seal flange 15 and the rear seal flange at both edges.
  • the seal flange along the outer peripheral portion of the substantially rectangular upper side opening of the box main body 3 is formed of a front seal flange 31 (refer to Fig. 3), a rear seal flange (not shown), and a pair of side seal flanges 33 (refer to Fig. 4), which are integrated with each other.
  • the front seal flange 31 is disposed on the front side in the vehicle front-rear direction, and extends in the vehicle width direction.
  • the rear seal flange is disposed on the rear side in the vehicle front-rear direction, and extends in the vehicle width direction.
  • the side seal flanges 33 are disposed on the outer sides in the vehicle width direction, and extend in the vehicle front-rear direction.
  • Each side seal flange 33 is joined to the front seal flange 31 and the rear seal flange, at both edges, in the vehicle front-rear direction, of the side seal flange 33, such that the side seal flange 33 is continuous to the front seal flange 31 and the rear seal flange, at both edges.
  • the front seal flanges 15 and 31 of the box main body 3 and the lid 5 are curved in a vertical direction, so that the front seal flanges 15 and 31 are in an arc shape and convex upward as the battery pack 1 is disposed with the lid 5 being on the upper side and the box main body 3 being on the lower side as shown in Fig. 2.
  • the front seal flange 15 of the lid 5 is curved in the vertical direction with a predetermined radius of curvature R so as to be highest at a central portion 15a in the vehicle width direction, and to be lowest at both left and right edge portions 15b at the same level.
  • the front seal flange 31 of the box main body 3 is curved in a vertical direction so as to be convex upward along the curved surface of the front seal flange 15 of the lid 5.
  • the distance D may be adjusted according to the application, but may preferably be within a range from about one-hundredth to about one-tenth the width of the battery pack 1, and may more preferably be within a range from about one-fiftieth to about one-thirtieth the width of the battery pack 1.
  • curved are the front seal flanges 15 and 31 to be located on the front side in the vehicle front-rear direction in a state where the battery pack 1 is mounted on a vehicle.
  • the rear seal flanges of the box main body 3 and the lid 5 are curved in the vertical direction so as to be convex upward, as similar to the front seal flanges 15 and 31.
  • each side seal flange 17 of the lid 5 is inclined in such a manner that the height of the surface is gradually reduced toward the outer sides in the vehicle width direction so that the surface of the side seal flange 17 can be smoothly continuous to the front seal flange 15 of the lid 5 and to the rear seal flange thereof.
  • the surface of each side seal flange 33 of the box main body 3 is inclined in such a manner that the height of the surface is gradually reduced toward the outer sides in the vehicle width direction so that the surface of the side seal flange 33 can be smoothly continuous to the front seal flange 31 and the rear seal flange.
  • the side seal flanges 17 and 33 extend substantially linearly in the vehicle front-rear direction, the side seal flanges 17 and 33 being located on the outer sides in the vehicle width direction in a state where the battery pack 1 is mounted on a vehicle. As a result, a high shock absorption performance can be maintained at the time of collision of a vehicle.
  • a connector 19 is attached to the connector attachment bracket 7, the connector 19 being for, for example, a high voltage harness to which a motor or an inverter is connected.
  • a rear edge portion 19a of the connector 19 protrudes inside the battery pack 1, and is fastened to an auxiliary unit 23 with a support bolt 21.
  • the front seal flange 15 of the lid 5 and the front seal flange 31 of the box main body 3 are sealed with a rubber sealing member 35 interposed therebetween.
  • a flange 27 extends outward in the vehicle width direction (leftward in Fig. 4), while protruding from a left edge portion of a floor panel 25.
  • the side member 29 having a closed cross-sectional shape is provided under the flange 27.
  • the attachment brackets 9 protruding outward in the vehicle width direction are provided to lower portions of both side surfaces of the battery pack 1 on outer sides in the vehicle width direction.
  • Each of the attachment brackets 9 is fastened to a bottom surface of the side member 29 with a bolt 37.
  • the side seal flanges 17 of the lid 5 and the side seal flanges 33 of the box main body 3 are sealed with the rubber sealing member 35 interposed therebetween.
  • the battery pack 1 includes the box main body 3 which houses batteries therein and which has the box shape with the closed bottom, and the lid 5 which covers the upper side opening of the box main body 3.
  • the seal flange including the front seal flange 15, the rear seal flange, and the side seal flanges 17 is formed along the outer peripheral portion of the box main body, while the seal flange including the front seal flange 31, the rear seal flange, and the side seal flanges 33 is formed along the outer peripheral portion of the lid 5. These seal flanges are brought into contact with each other to provide the sealing therebetween.
  • the front seal flanges 15 and 31 and the rear seal flanges of the box main body 3 and of the lid 5 are curved with the predetermined radius of curvature R. Accordingly, when the seal flange of the lid 5 is placed on the seal flange of the box main body 3 for assembly with the sealing member 35 interposed therebetween, the lateral position shift of the lid 5 relative to the box main body 3 is prevented. As a result, a gap is less likely formed between the seal flanges, whereby a high sealing performance can be maintained.
  • the front seal flanges 15 and 31 and the rear seal flanges of the box main body 3 and of the lid 5 are curved so as to be convex upward when the battery pack 1 is disposed with the lid 5 being on the upper side and the box main body 3 being the lower side. For this reason, when a vehicle is driven with the battery pack 1 being mounted on a vehicle body, mud, water, and the like splashed from the road efficiently slide or flow downward along upper surfaces of the seal flanges.
  • the seal flanges curved to be convex upward are provided on both the front and rear sides in the vehicle front-rear direction.
  • a battery pack may have a structure in which a seal flange curved as described above is disposed on any one of the front and rear sides in the vehicle front-rear direction.
  • a connector attachment bracket to which a connector for a high voltage harness is connected is provided on a front surface of a box main body of a battery pack.
  • the sealing performance for the attachment portion to which the high voltage harness is attached is further improved because of the following reason. Specifically, during the driving of a vehicle, even when mud, water, and the like on the road are splashed in a direction from the front side to the rear side onto an upper surface of the seal flanges, the mud, water, and the like effectively slide or flow down toward the both sides in the vehicle width direction.
  • the battery pack according to the present invention makes it possible to prevent a lateral shift of the lid relative to the box main body otherwise occurring when the seal flange of the lid is mounted on the seal flange of the box main body for assembly. Thereby, a gap is less likely formed between the seal flanges, and a high sealing performance can be maintained. Accordingly, the battery pack of the present invention is industrially applicable.

Abstract

A battery pack including: a box main body housing a battery therein and having a box shape with an upper side opening; and a lid covering the upper side opening of the box main body. The box main body has a first seal flange formed along an outer peripheral portion of the box main body, and the lid has a second seal flange formed along an outer peripheral portion of the lid. The first and second seal flanges are in contact with each other and seal the battery pack. The first and second seal flanges are curved with a predetermined curvature.

Description

BATTERY PACK
The present invention relates to a battery pack which houses a battery therein and which is mounted on an electric vehicle or the like.
A battery pack for housing multiple batteries is provided to an electric vehicle which travels by using a motor as a drive source. Japanese Patent No. 3199296 discloses a battery pack including a battery box and a lid, and provided under seats on which occupants are seated. The battery box is disposed on the lower side in the battery pack, and has a box shape having a closed bottom. The lid is disposed at the upper side of the battery box.
However, the above-mentioned battery pack has a concern that the sealing performance between the battery box and the lid may be lowered because of the following reason. Specifically, since a mating portion between the battery box and the lid in the battery pack is linear when viewed laterally, the position of the lid is likely to be laterally shifted relative to the battery box during the assembly of the battery box and the lid. As a result, a gap is formed between the battery box and the lid, resulting in the lowering of the sealing performance.
The present invention has been made in view of the above-described concern, and an object of the present invention is to provide a battery pack which enables the positional shift during the assembly to be prevented, and a high sealing performance to be maintained.
An aspect of the present invention is a battery pack including: a box main body housing a battery therein, the box main body having a box shape with an upper side opening, the box main body having a first seal flange formed along an outer peripheral portion of the box main body; and a lid covering the upper side opening of the box main body, the lid having a second seal flange formed along an outer peripheral portion of the lid, the first and second seal flanges being in contact with each other and sealing the battery pack, wherein the first and second seal flanges are curved with a predetermined curvature.
Fig. 1 is a perspective view of a battery pack according to an embodiment of the present invention. Fig. 2 is a front view of the battery pack of Fig. 1. Fig. 3 is a cross-sectional view taken along the III-III line of Fig. 1. Fig. 4 is a cross-sectional view taken along the IV-IV line of Fig. 1.
Hereinafter, a preferred embodiment of the present invention is described with reference to the drawings.
As shown in Fig. 1, a battery pack 1 according to the embodiment of the present invention includes a box main body 3 and a lid 5. The box main body 3 has a box shape with an upper side opening and a closed bottom. The lid 5 is disposed on the box main body 3, and covers the upper side opening of the box main body 3. When the battery pack 1 is mounted on a vehicle, the box main body 3 is disposed on a lower side of the battery pack 1. Seal flanges are formed along outer peripheral portions of the upper side opening of the box main body 3 and the lower side opening of the lid 5, respectively. These seal flanges are brought into contact with each other to seal the battery pack 1.
A connector attachment bracket 7 is provided to a central portion, in a vehicle width direction, of a front surface of the box main body 3. Attachment brackets 9 are attached to the front surface of the box main body 3 respectively at outer sides, in the vehicle width direction, of the connector attachment bracket 7. With the attachment brackets 9, the battery pack 1 is supported on a vehicle body member such as a side member 29 (refer to Fig. 4). Moreover, for example, four attachment brackets 9 are attached to each of right and left side surfaces of the box main body 3.
The lid 5 has a first convex portion 11 and a second convex portion 13. The first convex portion 11 is disposed on a front side in a vehicle front-rear direction, and bulged upward. The second convex portion 13 is disposed on a rear side in the vehicle front-rear direction, and bulged upward. These first convex portion 11 and second convex portion 13 are arranged away from each other in the front-rear direction with a predetermined distance therebetween.
Moreover, the seal flange along the outer peripheral portion of the substantially rectangular lower side opening of the lid 5 is formed of a front seal flange 15, a rear seal flange (not shown), and a pair of side seal flanges 17, which are integrated with each other. The front seal flange 15 is disposed on a front side in the vehicle front-rear direction, and extends in the vehicle width direction. The rear seal flange is disposed on a rear side in the vehicle front-rear direction, and extends in the vehicle width direction. The side seal flanges 17 are disposed on outer sides in the vehicle width direction, and extend in the vehicle front-rear direction. Each side seal flange 17 is joined to the front seal flange 15 and the rear seal flange at both edges, in the vehicle front-rear direction, of the side seal flange 17, such that the side seal flange 17 is continuous to the front seal flange 15 and the rear seal flange at both edges.
Moreover, the seal flange along the outer peripheral portion of the substantially rectangular upper side opening of the box main body 3 is formed of a front seal flange 31 (refer to Fig. 3), a rear seal flange (not shown), and a pair of side seal flanges 33 (refer to Fig. 4), which are integrated with each other. The front seal flange 31 is disposed on the front side in the vehicle front-rear direction, and extends in the vehicle width direction. The rear seal flange is disposed on the rear side in the vehicle front-rear direction, and extends in the vehicle width direction. The side seal flanges 33 are disposed on the outer sides in the vehicle width direction, and extend in the vehicle front-rear direction. Each side seal flange 33 is joined to the front seal flange 31 and the rear seal flange, at both edges, in the vehicle front-rear direction, of the side seal flange 33, such that the side seal flange 33 is continuous to the front seal flange 31 and the rear seal flange, at both edges.
In this embodiment, the front seal flanges 15 and 31 of the box main body 3 and the lid 5 are curved in a vertical direction, so that the front seal flanges 15 and 31 are in an arc shape and convex upward as the battery pack 1 is disposed with the lid 5 being on the upper side and the box main body 3 being on the lower side as shown in Fig. 2. Specifically, the front seal flange 15 of the lid 5 is curved in the vertical direction with a predetermined radius of curvature R so as to be highest at a central portion 15a in the vehicle width direction, and to be lowest at both left and right edge portions 15b at the same level. Meanwhile, the front seal flange 31 of the box main body 3 is curved in a vertical direction so as to be convex upward along the curved surface of the front seal flange 15 of the lid 5. Note that the difference in height between the central portion 15a of the front seal flange 15 and the both left and right edge portions 15b thereof is set to a distance D. The distance D may be adjusted according to the application, but may preferably be within a range from about one-hundredth to about one-tenth the width of the battery pack 1, and may more preferably be within a range from about one-fiftieth to about one-thirtieth the width of the battery pack 1.
In Figs. 1 and 2, curved are the front seal flanges 15 and 31 to be located on the front side in the vehicle front-rear direction in a state where the battery pack 1 is mounted on a vehicle. In this embodiment, also on the rear side (not shown) in the vehicle front-rear direction, the rear seal flanges of the box main body 3 and the lid 5 are curved in the vertical direction so as to be convex upward, as similar to the front seal flanges 15 and 31.
Moreover, a surface of each side seal flange 17 of the lid 5 is inclined in such a manner that the height of the surface is gradually reduced toward the outer sides in the vehicle width direction so that the surface of the side seal flange 17 can be smoothly continuous to the front seal flange 15 of the lid 5 and to the rear seal flange thereof. Likewise, the surface of each side seal flange 33 of the box main body 3 is inclined in such a manner that the height of the surface is gradually reduced toward the outer sides in the vehicle width direction so that the surface of the side seal flange 33 can be smoothly continuous to the front seal flange 31 and the rear seal flange.
Note that, in the battery pack 1, the side seal flanges 17 and 33 extend substantially linearly in the vehicle front-rear direction, the side seal flanges 17 and 33 being located on the outer sides in the vehicle width direction in a state where the battery pack 1 is mounted on a vehicle. As a result, a high shock absorption performance can be maintained at the time of collision of a vehicle.
As shown in Fig. 3, a connector 19 is attached to the connector attachment bracket 7, the connector 19 being for, for example, a high voltage harness to which a motor or an inverter is connected. A rear edge portion 19a of the connector 19 protrudes inside the battery pack 1, and is fastened to an auxiliary unit 23 with a support bolt 21. The front seal flange 15 of the lid 5 and the front seal flange 31 of the box main body 3 are sealed with a rubber sealing member 35 interposed therebetween.
As shown by the long dashed double-dotted line in Fig. 4, a flange 27 extends outward in the vehicle width direction (leftward in Fig. 4), while protruding from a left edge portion of a floor panel 25. The side member 29 having a closed cross-sectional shape is provided under the flange 27.
As described above, the attachment brackets 9 protruding outward in the vehicle width direction are provided to lower portions of both side surfaces of the battery pack 1 on outer sides in the vehicle width direction. Each of the attachment brackets 9 is fastened to a bottom surface of the side member 29 with a bolt 37. Moreover, the side seal flanges 17 of the lid 5 and the side seal flanges 33 of the box main body 3 are sealed with the rubber sealing member 35 interposed therebetween.
The battery pack 1 according to the embodiment of the present invention includes the box main body 3 which houses batteries therein and which has the box shape with the closed bottom, and the lid 5 which covers the upper side opening of the box main body 3. The seal flange including the front seal flange 15, the rear seal flange, and the side seal flanges 17 is formed along the outer peripheral portion of the box main body, while the seal flange including the front seal flange 31, the rear seal flange, and the side seal flanges 33 is formed along the outer peripheral portion of the lid 5. These seal flanges are brought into contact with each other to provide the sealing therebetween. The front seal flanges 15 and 31 and the rear seal flanges of the box main body 3 and of the lid 5 are curved with the predetermined radius of curvature R. Accordingly, when the seal flange of the lid 5 is placed on the seal flange of the box main body 3 for assembly with the sealing member 35 interposed therebetween, the lateral position shift of the lid 5 relative to the box main body 3 is prevented. As a result, a gap is less likely formed between the seal flanges, whereby a high sealing performance can be maintained.
Moreover, in the battery pack 1, the front seal flanges 15 and 31 and the rear seal flanges of the box main body 3 and of the lid 5 are curved so as to be convex upward when the battery pack 1 is disposed with the lid 5 being on the upper side and the box main body 3 being the lower side. For this reason, when a vehicle is driven with the battery pack 1 being mounted on a vehicle body, mud, water, and the like splashed from the road efficiently slide or flow downward along upper surfaces of the seal flanges.
In the battery pack 1 according to this embodiment, the seal flanges curved to be convex upward are provided on both the front and rear sides in the vehicle front-rear direction. However, a battery pack may have a structure in which a seal flange curved as described above is disposed on any one of the front and rear sides in the vehicle front-rear direction. Here, suppose a case where a connector attachment bracket to which a connector for a high voltage harness is connected is provided on a front surface of a box main body of a battery pack. In such a case, when seal flanges curved to be convex upward are provided on a front side, in the vehicle front-rear direction, of the battery pack, the sealing performance for the attachment portion to which the high voltage harness is attached is further improved because of the following reason. Specifically, during the driving of a vehicle, even when mud, water, and the like on the road are splashed in a direction from the front side to the rear side onto an upper surface of the seal flanges, the mud, water, and the like effectively slide or flow down toward the both sides in the vehicle width direction. Note that when parts for which a high sealing performance is provided exist only on a rear surface of a box main body of a battery pack, it is also possible to provide a seal flange curved to be convex upward only on a rear side, in the vehicle front-rear direction, of the battery pack.
The present disclosure relates to subject matters contained in Japanese Patent Application No. 2009-167732, filed on July 16, 2009, the disclosures of which is expressly incorporated herein by reference in its entirety.
The battery pack according to the present invention makes it possible to prevent a lateral shift of the lid relative to the box main body otherwise occurring when the seal flange of the lid is mounted on the seal flange of the box main body for assembly. Thereby, a gap is less likely formed between the seal flanges, and a high sealing performance can be maintained. Accordingly, the battery pack of the present invention is industrially applicable.

Claims (3)

  1. A battery pack comprising:
    a box main body housing a battery therein, the box main body having a box shape with an upper side opening, the box main body having a first seal flange formed along an outer peripheral portion of the box main body; and
    a lid covering the upper side opening of the box main body, the lid having a second seal flange formed along an outer peripheral portion of the lid, the first and second seal flanges being in contact with each other and sealing the battery pack, wherein
    the first and second seal flanges are curved with a predetermined curvature.
  2. The battery pack according to claim 1, wherein
    the first and second seal flanges are curved in such a manner that the first and second seal flanges are convex upward when the battery pack is mounted on a vehicle with the lid being on an upper side and the box main body being on a lower side.
  3. The battery pack according to claim 2, wherein
    the battery pack is mounted on the vehicle with the curved seal flanges being disposed on at least one of a front side and a rear side, in a vehicle front-rear direction, of the battery pack.
PCT/JP2010/004096 2009-07-16 2010-06-18 Battery pack WO2011007501A1 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
MX2012000593A MX2012000593A (en) 2009-07-16 2010-06-18 Battery pack.
US13/383,705 US8877364B2 (en) 2009-07-16 2010-06-18 Battery pack
EP10799565.6A EP2454770B1 (en) 2009-07-16 2010-06-18 Battery pack
RU2012101460/11A RU2483394C1 (en) 2009-07-16 2010-06-18 Accumulator battery
BR112012000777-7A BR112012000777B1 (en) 2009-07-16 2010-06-18 BATTERY PACKING.
KR1020127001077A KR101319116B1 (en) 2009-07-16 2010-06-18 Battery pack
CN201080031827.9A CN102473873B (en) 2009-07-16 2010-06-18 Battery pack

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2009167732A JP5531478B2 (en) 2009-07-16 2009-07-16 battery pack
JP2009-167732 2009-07-16

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WO2011007501A1 true WO2011007501A1 (en) 2011-01-20

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US (1) US8877364B2 (en)
EP (1) EP2454770B1 (en)
JP (1) JP5531478B2 (en)
KR (1) KR101319116B1 (en)
CN (1) CN102473873B (en)
BR (1) BR112012000777B1 (en)
MX (1) MX2012000593A (en)
RU (1) RU2483394C1 (en)
WO (1) WO2011007501A1 (en)

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US10411315B2 (en) 2016-06-24 2019-09-10 Toyota Jidosha Kabushiki Kaisha Battery pack structure including cooling duct outside pack case connected to chamber inside pack case by connector and first and second sealing members
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WO2021043993A1 (en) * 2019-09-05 2021-03-11 Bayerische Motoren Werke Aktiengesellschaft Vehicle floor for an energy-store floor assembly of a motor vehicle
WO2021043984A1 (en) * 2019-09-05 2021-03-11 Bayerische Motoren Werke Aktiengesellschaft Energy-store floor assembly for a motor vehicle
CN114206711A (en) * 2019-09-05 2022-03-18 宝马股份公司 Vehicle floor for an energy storage floor assembly of a motor vehicle
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Also Published As

Publication number Publication date
EP2454770A4 (en) 2014-08-13
US8877364B2 (en) 2014-11-04
BR112012000777A2 (en) 2016-12-20
JP5531478B2 (en) 2014-06-25
MX2012000593A (en) 2012-02-13
KR20120025605A (en) 2012-03-15
JP2011023230A (en) 2011-02-03
EP2454770A1 (en) 2012-05-23
BR112012000777B1 (en) 2021-04-06
CN102473873A (en) 2012-05-23
US20120115000A1 (en) 2012-05-10
KR101319116B1 (en) 2013-10-17
CN102473873B (en) 2014-07-30
EP2454770B1 (en) 2017-10-18
RU2483394C1 (en) 2013-05-27

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