Classifications

• • 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
  • H01M50/289—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
  • H01M50/291—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 characterised by their shape
• • 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

Definitions

• This disclosure relates to a battery pack tray and a battery pack including this tray.
• Patent Document 1 describes a battery tray that includes a pair of side members that are provided on the left and right sides of the vehicle in the vehicle width direction and fixed to the vehicle, and a cross member that extends in the vehicle width direction.
• both ends of the cross member are not fixed to the side members, so when a collision load is applied to the side members, the cross member may shift relative to the side members, causing unintended deformation of the battery pack.
• At least one embodiment of the present disclosure aims to provide a battery pack tray that can reduce the risk of unintended deformation due to collision load during a vehicle collision, and a battery pack including this tray.
• the battery pack tray according to the present disclosure is a battery pack tray mounted on a vehicle, and comprises at least one battery cell, a bottom plate portion on which the at least one battery cell is placed, and a pair of side members fixed to the bottom plate portion with a gap therebetween in the vehicle width direction, the pair of side members extending in the fore-and-aft direction of the vehicle, and at least one cross member extending in the vehicle width direction, the at least one cross member overlapping the center position of the at least one battery cell in the height direction, which is a direction perpendicular to the bottom plate portion, and is fixed to each of the pair of side members by being welded to each of the pair of side members.
• the cross member is fixed by welding to each of the pair of side members, so that even if a collision load is applied to the cross member during a vehicle collision, the cross member is less likely to shift relative to the side members, thereby reducing the risk of unintended deformation of the tray.
• the cross member receives the impact load in its length direction.
• the cross member may bend due to the impact load.
• the cross member is positioned in a height direction that overlaps with the center of the battery module in the height direction, it is less likely to bend when a collision load is applied, thereby reducing the risk of unintended deformation of the tray.
• FIG. 1 is a schematic diagram illustrating the configuration of a battery pack according to an embodiment of the present disclosure, with the case lid removed from the case tray to allow the interior of the case to be seen.
• FIG. 2 is a cross-sectional view of a battery pack according to an embodiment of the present disclosure.
• the battery pack 1 is a battery pack mounted on a vehicle.
• This vehicle is an electric vehicle such as a battery electric vehicle (BEV) powered by a motor, or a hybrid vehicle (HV) or fuel cell vehicle (FCV) powered by an engine and motor.
• a hybrid vehicle is, for example, a plug-in hybrid vehicle (PHEV, PHV) that can be charged from an external power source via external charging or can externally supply power to external devices, but is not limited to plug-in hybrid vehicles.
• the battery pack 1 may be mounted inside the vehicle cabin or outside the vehicle cabin (for example, under the floor).
• Battery pack 1 comprises a case 2 and a battery module 5 housed within case 2.
• Case 2 comprises a tray 3 on which battery module 5 is placed, and a lid 4 which combines with tray 3 on which battery module 5 is placed to seal battery module 5 inside case 2.
• Figure 1 shows a configuration in which multiple battery modules 5 are housed, this configuration is not limited, as long as at least one battery module is housed.
• what is housed within case 2 is not limited to a battery module made up of multiple battery cells, and at least one battery cell may be housed within case 2.
• the tray 3 comprises a bottom plate 11 on which the battery module 5 is placed, a pair of side members 12a, 12b that extend in the longitudinal direction of the vehicle and are fixed to the bottom plate 11 with a gap in the width direction of the vehicle when the battery pack 1 is mounted on the vehicle, and a cross member 13 that extends in the width direction of the vehicle.
• the cross member 13 is fixed to each of the side members 12a, 12b by being welded to each of the side members 12a, 12b. While Figure 1 shows a configuration with two cross members 13, only one cross member 13 may be provided, or three or more cross members 13 may be provided.
• the side members 12a, 12b may have a plate shape.
• the tray 3 may further have a plate-shaped front member 14a and rear member 14b that are fixed to the bottom plate portion 11 with a gap between them in the longitudinal direction of the vehicle and extend in the vehicle width direction, with the front member 14a connected to the front ends of each of the side members 12a, 12b, and the rear member 14b connected to the rear ends of each of the side members 12a, 12b.
• the side members 12a, 12b, front member 14a, and rear member 14b configured in this way form side plates that are provided along the periphery of the bottom plate portion 11 of the tray 3.
• a pair of plate-shaped mounting frames 15a, 15b may be fixed to each of the pair of side members 12a, 12b so as to protrude outward in the vehicle width direction from each of the pair of side members 12a, 12b.
• Each of the mounting frames 15a, 15b is configured to be able to engage a fastening jig 16, such as a bolt, in order to secure the tray 3 to the vehicle body (e.g., a pair of floor side members extending in the fore-and-aft direction of the vehicle).
• the cross member 13 is provided in a position in the height direction that overlaps with the center position CP of the battery module 5 in the height direction. Furthermore, it is preferable that the cross member 13 be provided so that there is a gap between the bottom plate portion 11 and the lower surface 13a that faces the bottom plate portion 11, i.e., so that it does not come into contact with the bottom plate portion 11. Furthermore, it is preferable that the cross member 13 be provided so that there is a gap between the top surface 13b that faces the lid portion 4 and the lid portion 4, i.e., so that it does not come into contact with the lid portion 4.
• the tray 3 may further be provided with reinforcing frames 17a, 17b fixed to the side members 12a, 12b and the mounting frames 15a, 15b, respectively.
• Reinforcing frames 17a, 17b each include a surface 17a1, 17b1 that forms an acute angle with the bottom plate portion 11 and faces outward in the vehicle width direction.
• Reinforcing frames 17a, 17b may have any configuration as long as they include such a surface 17a1, 17b1.
• Multiple plate-shaped (e.g., rib-shaped) reinforcing frames 17a, 17b may be provided at intervals along the length of mounting frames 15a, 15b (perpendicular to the plane of FIG. 2), or triangular prism-shaped reinforcing frames 17a, 17b may be provided.
• Reinforcing frames 17a, 17b of the former configuration are depicted in FIG. 2.
• the cross member 13 is fixed by welding to each of the side members 12a and 12b. This means that even if a collision load is applied to the cross member 13 during a vehicle collision, the cross member 13 is less likely to shift relative to the side members 12a and 12b, thereby reducing the risk of unintended deformation of the tray 3. Furthermore, when an impact load is applied to the tray 3 during a vehicle collision, particularly a side collision, the cross member 13 receives the impact load in its length direction. However, if the cross member 13 is positioned either downward or upward in the height direction, the cross member 13 may bend due to the impact load. In contrast, because the cross member 13 is positioned in a height direction that overlaps with the center position CP of the battery module 5, it is less likely to bend when a collision load is applied, thereby reducing the risk of unintended deformation of the tray 3.
• the reinforcing frames 17a, 17b When the tray 3 is equipped with mounting frames 15a, 15b and reinforcing frames 17a, 17b, the reinforcing frames 17a, 17b have surfaces 17a1, 17b1 with the above-described configuration, which transmit the collision load in a side impact in a direction perpendicular to the surfaces 17a1, 17b1, i.e., to the cross members 13 fixed to the side members 12a, 12b, respectively, thereby reducing the risk of unintended deformation of the tray 3.
• the cross member 13 similar to the battery pack tray described in Patent Document 1, consisting of a lower cross member fixed to the bottom plate portion 11 and an upper cross member fixed to the lower cross member, extending parallel to and above the lower cross member with a gap between them.
• the battery pack 1 by leaving a gap between the underside 13a of the cross member 13 and the bottom plate portion 11 and providing a single cross member 13 at a position overlapping with the center position CP of the battery module 5 in the height direction, the risk of the cross member 13 bending due to the impact load of a side collision can be reduced. Therefore, compared to the configuration described in Patent Document 1, the number of cross members can be reduced, and as a result, the tray 31 can be made lighter.
• the collision load in a side collision can be reliably transmitted to the cross member 13 by surfaces 17a1 and 17b1, thereby reducing the risk of unintended deformation of the tray 3.
• the cables connected to the battery modules 5 can be passed through the gap between the top surface 13b and the lid portion 4, making it possible to make the battery pack 1 more compact.

Landscapes

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

Priority Applications (1)

Applications Claiming Priority (2)

Publications (2)

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Family Applications (1)

Country Status (2)

Citations (8)

• 2025
  • 2025-02-17 JP JP2025546763A patent/JP7831706B2/ja active Active
  • 2025-02-17 WO PCT/JP2025/005089 patent/WO2025187369A1/ja active Pending

Patent Citations (8)

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