JP2016130096A - Vehicle battery pack cooling unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate connection work for connecting a battery pack to a duct of a cooling unit.SOLUTION: Provided is a cooling unit 40 for cooling a vehicle-driving battery pack 30 mounted under a floor of a cabin 4, the cooling unit 40 includes: a cooling blower 50 which is fixedly suspended from a rear surface of a floor panel 90 and which blows cooling air; and a cooling duct 70 which introduces the cooling air to the battery pack 30, and the cooling duct 70 is moved from a position where an exhaust port 73 on the battery pack 30-side is separated from the battery pack 30 to a position where the exhaust port 30 is connected to the battery pack 30 by a moving mechanism 74 slidably moving on this cooling duct 70.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a cooling unit for a vehicle battery pack that is mounted under a passenger compartment floor.

  In electric vehicles and hybrid vehicles, a battery pack including a battery for driving a motor is mounted. The battery pack is disposed at various positions of the vehicle such as the lower part of the seat, the underfloor space of the floor panel, and the luggage compartment according to the vehicle configuration, the size of the battery pack, and the like. In particular, when priority is given to the size of the passenger compartment space, the battery pack may be disposed in the under floor space of the floor panel.

  The battery pack generates heat due to charge / discharge, and the output characteristics of the battery pack deteriorate when the battery pack becomes hot. Therefore, the battery pack is cooled by a cooling blower that blows air in the passenger compartment to the underfloor space. As such a cooling blower mounting structure, there is a structure in which a cooling blower is mounted using a bracket for mounting an intake duct to a floor panel (see, for example, Patent Document 1).

JP 2010-285070 A

  In recent years, cooling blowers and ducts are integrated into a cooling unit and then placed in the under floor space of the floor panel. Since the cooling unit is large and heavy, it is difficult to align the battery pack with the duct of the cooling unit, and the assembling work is troublesome. Also, when adjusting the position of the cooling unit in order to align the battery pack and the duct of the cooling unit, there is no room in the underfloor space, so the cooling unit may interfere with the body in the underfloor space. End position adjustment is also difficult. In addition, the floor panel and other components may make it difficult to visually check the connection between the battery pack and the cooling unit duct, and it may take time to align the battery pack and the cooling unit duct. .

  Therefore, an object of the present invention is to provide a cooling unit that can easily connect the battery pack and the duct of the cooling unit.

  The vehicle battery pack cooling unit of the present invention is a cooling unit for cooling a vehicle driving battery pack mounted under the floor of a passenger compartment, the cooling unit is suspended and fixed to the back surface of the floor panel, A cooling blower for discharging cooling air; and a cooling duct for guiding the cooling air to the battery pack. The cooling duct connects an exhaust port on the battery pack side to the battery pack from a position away from the battery pack. A moving mechanism that moves to a position is provided.

  ADVANTAGE OF THE INVENTION According to this invention, the connection operation | work of a battery pack and the duct of a cooling unit can be performed easily, and the connection work property of a duct can be improved.

1 is a schematic side view of a hybrid vehicle in an embodiment of the present invention. It is a perspective view of a cooling unit and an underbody. It is a disassembled perspective view of a cooling unit. It is a disassembled perspective view of a cooling blower and a floor panel. It is a disassembled perspective view of a cooling blower and an intake duct. It is a front view of a cooling unit and a battery pack. FIG. 7A is an enlarged view of the connection port and the exhaust port of the cooling duct, FIG. 7A shows the state before the cooling duct is connected to the battery pack, and FIG. 7B is the state after the cooling duct is connected to the battery pack. Indicates the state.

  First, the arrangement position of the battery pack 30 including the battery that supplies power to the drive motor of the hybrid vehicle 1 will be described. As shown in FIG. 1, the hybrid vehicle 1 includes a passenger compartment floor panel 10 that constitutes a floor surface of a passenger compartment 4 in which a front seat 2 and a rear seat 3 are installed, and an underbody that constitutes an underfloor space of the passenger compartment 4. 20.

  In the underfloor space between the front seat 2 and the rear seat 3, a battery pack 30 that supplies power to the drive motor is disposed. The battery pack 30 is disposed on the right side in the vehicle width direction, and the air in the vehicle compartment 4 is blown to the battery pack 30 at a position adjacent to the battery pack 30 in the vehicle width direction, that is, on the left side in the vehicle width direction. A cooling unit 40 is arranged.

  As shown in FIG. 2, the underbody 20 includes a floor tunnel 21 extending in the front-rear direction at the vehicle width center, a side sill 22 extending in the front-rear direction on both sides of the vehicle width, a cross member 23 extending in the vehicle width direction, the floor tunnel 21, and the side sill. 22 and a bottom panel 24, which is the bottom of the portion surrounded by the cross member 23. In FIG. 2, arrow FR indicates the direction in which the vehicle travels, arrow UP indicates the upward direction of the vehicle, and arrow LH indicates the left side when facing the forward direction of the vehicle. The relationship between the arrows FR, UP, and LH is the same in other drawings.

  The underbody 20 is formed with two recesses 25a and 25b surrounded by a floor tunnel 21, a side sill 22, a cross member 23, and a bottom panel 24. The recesses 25 a and 25 b are located between the front seat 2 and the rear seat 3.

  The battery pack 30 is accommodated in the recess 25a. In addition, the cooling unit 40 is accommodated in the recess 25 b so that the air blowing port faces the battery pack 30. As will be described later, the accommodated cooling unit 40 includes a cooling blower 50 that discharges cooling air, an intake duct 60 that takes in air in the passenger compartment, and a cooling duct 70 that guides the cooling air to the battery pack 30. 50, the intake duct 60 and the cooling duct 70 are suspended and fixed to a floor panel 90 which forms a part of the passenger compartment floor panel 10.

  The floor panel 90 is provided with four mounting holes 93D for mounting the floor panel 90 to the cross member 23 of the underbody 20. The floor panel 90 to which the cooling blower 50, the intake duct 60 and the cooling duct 70 are fixed in this way is fixed to the cross member 23 by four bolts D through the four mounting holes 93D. An attachment hole 64 </ b> C for attaching the intake duct 60 to the cross member 23 of the underbody 20 is provided at the end of the intake duct 60. The intake duct 60 is fixed to the cross member 23 by the clip C through the mounting hole 64C.

  The cross member 23 is provided with a screw hole 23D corresponding to the bolt D for fixing the floor panel 90 and a fixing hole 23C corresponding to the clip C for fixing the intake duct 60. The floor tunnel 21 is provided with a bracket 21a having a screw hole 21D corresponding to a bolt D for fixing the floor panel 90.

  The upper part of the battery pack 30 is covered with another floor panel (not shown) attached to the cross member 23. This floor panel also covers the top of the cooling duct 70 of the cooling unit 40. The floor panel 90 of the cooling unit 40 and another floor panel that covers the upper part of the battery pack 30 constitute a part of the compartment floor panel 10 of the compartment 4.

  Next, the cooling unit 40 will be described with reference to FIGS. 3-5, the cooling unit 40 shown in FIG. 2 is shown upside down. That is, FIGS. 3 to 5 show the cooling unit 40 as viewed from below.

  As shown in FIG. 3, the cooling blower 50, the intake duct 60 and the cooling duct 70 constituting the cooling unit 40 are suspended from the lower surface of the floor panel 90. The skeleton members 100 and 101 that reinforce the floor panel 90 are fixed to the lower surface of the floor panel 90, and the cooling blower 50 is fixed to one of the skeleton members 100. The skeletal member 100 is firmly fixed to the lower surface of the floor panel 90 and holds the cooling blower 50 so that it can resist vibration and the like. In addition, an intake duct 60 is connected to the intake port 51 of the cooling blower 50, and the intake duct 60 can guide the air in the passenger compartment to the cooling blower 50 (see FIG. 5). On the other hand, the connection port 71 of the cooling duct 70 is fitted into the discharge port 52 of the cooling blower 50, and the cooling air discharged from the cooling blower 50 is guided to the battery pack 30 by the cooling duct 70.

  The cooling blower 50 is prevented from entering water from the outside by the waterproof tray 80, and the waterproof tray 80 is also fixedly held by the skeleton members 100 and 101. The waterproof tray 80 is made of resin, and mounting holes 80E for fixing to the skeleton members 100 and 101 are provided at the four corners. Corresponding to the positions of the mounting holes 80E, the frame members 100 and 101 are provided with mounting holes 100E and 101E, respectively.

  As shown in FIG. 4, the cooling blower 50 and the intake duct 60 are fixed to the lower surface of the floor panel 90 to which the skeleton members 100 and 101 are fixed. The frame member 100 is provided with two stud bolts 100A for fixing the cooling blower 50, and the stud panel 92A for fixing the cooling blower 50 is also provided on the lower surface of the floor panel 90. Corresponding to these stud bolts 92A, 100A, the cooling blower 50 has a mounting hole 50A for fixing the cooling blower 50, and is fixed to the stud bolts 92A, 100A by a nut A.

  On the lower surface of the floor panel 90, a bracket 95 having a clip fixing hole 94B for fixing the intake duct 60 is provided. Corresponding to the clip fixing hole 94B, the intake duct 60 is provided with a mounting hole 64B for fixing the intake duct 60, and the intake duct 60 is fixed to the bracket 95 of the floor panel 90 by the clip B. The

  The floor panel 90 is composed of a thin sheet metal in which a plurality of beads 91 extending in the vehicle width direction are formed, and has a shape that covers the recess 25b. The frame members 100 and 101 fixed to the floor panel 90 are disposed at both ends of the floor panel 90 and in a direction orthogonal to the beads 91.

  The skeleton member 100 is provided with an attachment hole 100D for attaching the skeleton member 100 to the cross member 23 of the underbody 20. One frame member 101 is also provided with a mounting hole 101D for mounting the frame member 101 to the cross member 23 of the underbody 20. The mounting holes 100D and 101D are disposed at positions corresponding to the mounting holes 93D of the floor panel 90. For this reason, the frame members 100 and 101 are fixed to the cross member 23 together with the floor panel 90 by the bolts D (see FIG. 2).

  The skeleton members 100 and 101 are made of a metal plate having a predetermined thickness. In addition, you may bend | fold and form a sheet metal. Since the frame members 100 and 101 reinforce the floor panel 90, a desired rigidity is required. In particular, since the cooling blower 50 is fixed to the skeleton member 100, rigidity that can withstand vibration of the cooling blower 50 is also required. Therefore, the fixing positions, shapes, and materials of the skeletal members 100 and 101 are set so that the floor panel 90 can be reinforced and the rigidity can withstand the vibration of the cooling blower 50. In the present embodiment, the skeleton member 100 to which the cooling blower 50 is attached has a wide shape.

  As shown in FIGS. 4 and 5, the cooling blower 50 includes a sirocco having an intake port 51 that sucks air in the direction of the rotation axis from a central portion of a rotary fan (not shown), and a discharge port 52 that discharges air in the radial direction of the rotation shaft. I am a fan. The cooling blower 50 is provided with three legs 53 having attachment holes 50 </ b> A for attaching the cooling blower 50 to the floor panel 90 and the frame member 100. The cooling blower 50 is connected to a power cable (not shown).

  An intake duct 60 is connected to the intake port 51 of the cooling blower 50. The intake duct 60 includes an intake port 61 (see FIGS. 1 and 2) that opens into the passenger compartment 4, a curved duct 62 that continues from the intake port 61, and a connection port 63 that connects to the intake port 51 of the cooling blower 50. Is provided. The intake duct 60 and the cooling blower 50 are fixed to each other by a clip (not shown) in a state where the connection port 63 and the intake port 51 are connected.

  A flange 64 is provided around the air inlet 61. The flange 64 is provided with an attachment hole 64B for attachment to the floor panel 90 and an attachment hole 64C for attachment to the cross member 23. In addition, as shown in FIG. 2, the air inlet 61 is provided with a louver 61 a that suppresses entry of foreign matter.

  Next, the cooling duct 70 will be described with reference to FIGS. As shown in FIG. 3, the cooling duct 70 includes a connection port 71 that is fitted into the discharge port 52 of the cooling blower 50, a duct 72 that is widened continuously from the connection port 71 toward the downstream side, and the battery pack 30. An exhaust port 73 that is a duct end that discharges air and a moving mechanism 74 that moves the exhaust port 73 from a position separated from the battery pack 30 to a position where the exhaust port 73 is connected to the battery pack 30 are provided.

  As shown in FIGS. 7A and 7B, the moving mechanism 74 is fitted into the discharge port 52 of the cooling blower 50 with a fitting length L so that the connection port 71 of the cooling duct 70 is fitted, and the cooling duct 70 is fitted. It is configured by being slidable in the direction. The fitting length L is a length corresponding to a position where the exhaust port 73 of the cooling duct 70 is connected to the battery pack 30 from a position away from the battery pack 30. That is, in a state where the connection port 71 of the cooling duct 70 is fitted to the back of the discharge port 52 of the cooling blower 50, the exhaust port 73 of the cooling duct 70 is separated from the battery pack 30, and the cooling duct 70 is connected to the cooling blower 50. The exhaust port 73 of the cooling duct 70 is connected to the battery pack 30 in a state where the discharge port 52 is pulled out from the back.

  A flange 73a made of an elastic member is provided at the exhaust port 73 of the cooling duct 70. On the upper side of the exhaust port 73, a recess 75 that engages with a later-described claw 33 of the battery pack 30 is provided.

  The moving mechanism 74 may have a fitting structure in which the cooling duct 70 is divided at an intermediate portion and the divided portions are slidable with respect to each other. In addition, a telescopic structure such as a bellows may be used instead of the fitting structure. Although the exhaust port 73 is branched into three in FIG. 3, it may be a single exhaust port.

  As shown in FIGS. 7A and 7B, an opening 32 to which the exhaust port 73 of the cooling duct 70 is connected is provided in a portion of the casing 31 of the battery pack 30 that faces the exhaust port 73 of the cooling duct 70. ing. A claw 33 that engages with the recess 75 of the exhaust port 73 of the cooling duct 70 is provided on the upper side in the vicinity of the opening 32 of the casing 31. Further, a claw 34 that engages with the flange 73 a of the exhaust port 73 is provided on the lower side in the vicinity of the opening 32 of the casing 31. The claws 33 and 34 are made of an elastic member.

  Next, assembly of the cooling unit 40 and attachment to the underbody 20 will be described. First, the frame members 100 and 101 are attached and fixed to the lower surface of the floor panel 90 with bolts (not shown). On the other hand, as shown in FIG. 5, the connection port 63 of the intake duct 60 is connected to the intake port 51 of the cooling blower 50, and the cooling blower 50 and the intake duct 60 are fixed to each other by a clip (not shown).

  Next, as shown in FIG. 4, the stud bolt 100A of the frame member 100 and the stud bolt 92A of the floor panel 90 are inserted into the mounting holes 50A of the legs 53 of the cooling blower 50 to which the intake duct 60 is fixed, and the nut A The cooling blower 50 is fastened to the skeleton member 100 and the floor panel 90 by fastening. Further, the flange 64 of the intake duct 60 is fixed to the floor panel 90 by inserting the clip B through the mounting hole 64B of the intake duct 60 and attaching it to the clip fixing hole 94B of the floor panel 90.

  Further, as shown in FIGS. 3 and 6, the connection port 71 of the cooling duct 70 is fitted to the depth of the discharge port 52 of the cooling blower 50, and the cooling duct 70 is slidably held with respect to the discharge port 52 of the cooling blower 50. To do. Further, a clip (not shown) is inserted into the attachment hole 80E of the waterproof tray 80 and the attachment holes 100E and 101E of the skeleton members 100 and 101, and the waterproof tray 80 is attached to the skeleton members 100 and 101. In this way, the cooling unit 40 is assembled.

  As shown in FIGS. 2 and 6, the assembled cooling unit 40 is accommodated in the recess 25 b of the underbody 20 in which the battery pack 30 is accommodated. Since a gap is formed between the exhaust port 73 and the opening 32 of the battery pack 30, the cooling unit 40 can move without interfering with other components by this gap. Position adjustment of the exhaust port 73 of the duct 70 and the opening 32 of the battery pack 30 is performed.

  As shown in FIGS. 7A and 7B, after the approximate positions of the exhaust port 73 of the cooling duct 70 and the opening 32 of the battery pack 30 are determined, the cooling duct 70 is slid from the discharge port 52 of the cooling blower 50. Then, the length of the fitting length L is pulled out, and the exhaust port 73 of the cooling duct 70 is connected to the opening 32 of the battery pack 30. At this time, the recess 75 in the vicinity of the exhaust port 73 is engaged with the claw 33 of the battery pack 30, the flange 73 a of the exhaust port 73 is engaged with the claw 34 of the battery pack 30, and the cooling duct 70 is connected to the battery pack 30. It is positioned and fixed to. Thereafter, the cooling unit 40 is fixed with the bolts D, and the mounting operation of the cooling unit 40 is completed.

  When the installation of the other components and the vehicle compartment floor panel 10 is completed and the cooling blower 50 is driven, the air in the vehicle compartment 4 is sucked from the intake port 61 and discharged from the exhaust port 73. The air discharged from the exhaust port 73 is blown to the battery pack 30 to cool the battery pack 30 and is discharged outside the underbody 20.

  As described above, when the cooling unit 40 is attached to the underbody 20, since the cooling duct 70 is separated from the battery pack 30, interference between the cooling unit 40 and other components can be suppressed. The degree of freedom of position adjustment can be expanded. Moreover, after adjusting the position of the exhaust port 73 of the cooling duct 70 and the opening 32 of the battery pack 30, the exhaust port 73 and the opening 32 can be connected by sliding the cooling duct 70. Connection work with the pack 30 can be easily performed, and connection workability can be improved.

  Further, since the cooling blower 50 is fixed to the lower surface of the floor panel 90, the cooling blower 50 is suspended from the floor panel 90, that is, placed in the upper portion of the recess 25b, so that the underbody 20 is submerged. Even in this case, it is possible to prevent water from entering the cooling blower 50. Moreover, since the cooling blower 50 is covered with the waterproof tray 80, the water immersion to the cooling blower 50 can further be suppressed.

  Further, since the cooling blower 50 is directly fixed to the skeleton member 100 having rigidity capable of withstanding the vibration of the cooling blower 50, even if the cooling blower 50 vibrates during the cooling blower operation, the vibration is generated by the floor panel 90 and the intake air. It is difficult to be transmitted to the duct 60 and the cooling duct 70, and noise due to vibration propagation of the cooling blower 50 can be suppressed. Further, since the skeleton member 100 is fixed to the underbody 20, the rigidity of the skeleton member 100 is increased, and noise due to vibration propagation of the cooling blower 50 can be further suppressed.

  In the present embodiment, since the floor panel 90 is reinforced by the skeleton members 100 and 101, the floor panel 90 has rigidity that does not deform even when an occupant rides on the floor panel 90, and as shown in FIG. Can be arranged at the part where the passenger gets on and off. Moreover, the influence on the cooling unit 40 by the load of getting on and off can also be suppressed. By providing the bead 91 on the floor panel 90, the rigidity of the floor panel 90 can be further improved.

4 compartment, 10 compartment floor panel, 20 underbody, 21 floor tunnel, 22 side sill, 23 cross member, 24 bottom panel, 25a, 25b recess, 30 battery pack, 32 opening, 33, 34 nail, 40 cooling unit , 50 Cooling blower, 52 Discharge port, 60 Intake duct, 70 Cooling duct, 71 Connection port, 73 Exhaust port, 73a Flange, 74 Moving mechanism, 75 Recessed part, 80 Waterproof tray, 90 Floor panel, 92A, 101A Stud bolt, 93D , 100D, 101D mounting hole, 100, 101 frame member.

Claims (1)

A cooling unit that cools a battery pack for driving a vehicle mounted under the floor of a passenger compartment,
The cooling unit includes a cooling blower that is suspended and fixed to the back surface of the floor panel and discharges cooling air, and a cooling duct that guides the cooling air to the battery pack.
The cooling unit for a vehicle battery pack, wherein the cooling duct includes a moving mechanism that moves an exhaust port on the battery pack side from a position separated from the battery pack to a position connected to the battery pack.

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