JP2019167060A - Battery pack protection structure of vehicle - Google Patents

Abstract

To provide a battery pack protection structure which can protect a battery pack reliably even if a lateral collision occurs in a state where a ground height of the collision side of a vehicle body is set higher than a normal case in a vehicle including a vehicle height adjusting means for changing a ground height of a vehicle body side part.SOLUTION: A vehicle 1 is provided with battery pack attachment brackets 17A, 17B and anchors 19A, 19B for detachably fixing a battery pack 11 to floor side members 13A, 13B and a battery pack support member 18 which can support the battery pack 11 on a floor panel 16 in a suspending manner. A fixing state between the anchors 19A, 19B and the floor side members 13A, 13B is released in conjunction with the battery pack attachment brackets 17A, 17B moving to the inner side in a vehicle with direction relative to the floor side members 13A, 13B.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a battery pack protection structure for a vehicle.

  Conventionally, vehicle height adjusting means for changing the ground clearance at the side of the vehicle body has been provided, and when a collision between vehicles, particularly a side collision of another vehicle (hereinafter referred to as a collision vehicle) with the vehicle, is expected. A technique for improving the occupant protection performance by increasing the vehicle height on the collision side compared to the normal time, keeping the occupant away from the collision vehicle and making the vehicle body frame member (for example, a side sill) easily subjected to a collision load is known. (For example, refer to Patent Document 1 below).

JP 2007-62447 A

  Here, in an electric vehicle equipped with a motor as a power source, the battery pack is often installed under the floor in consideration of its size and weight. However, when the battery pack is installed under the floor, if the vehicle height on the collision side is increased in order to improve the occupant protection performance, the battery pack is protected by a skeletal member or floor panel deformed by the collision vehicle hitting the battery pack. It was difficult to do so, which could lead to battery damage.

  For this reason, the present invention provides a vehicle having a vehicle height adjusting means for changing the ground height on the side of the vehicle body, and a side collision occurs when the ground height on the collision side of the vehicle body is higher than normal. It is an object of the present invention to provide a battery pack protection structure for a vehicle that can protect the battery pack more appropriately even in such a case.

  A battery pack protection structure for a vehicle according to a first aspect of the present invention for solving the above problems includes a sensor for detecting an object approaching from the side of the host vehicle, and a vehicle capable of adjusting a ground height of a side portion of the vehicle body. A battery pack protection structure for a vehicle, comprising: a height adjustment means; a control means for controlling the vehicle height adjustment means based on a detection result by the sensor; and a battery pack disposed under a floor of a vehicle body. Battery pack fixing means disposed on both sides of the pack in the vehicle width direction and detachably fixed to the first skeleton member extending along the vehicle longitudinal direction on both sides of the vehicle in the vehicle width direction, and the battery Battery pack support means capable of hanging and supporting the pack on a second frame member or floor panel extending along the vehicle width direction of the vehicle. The terry pack fixing means releases the fixed state between the battery pack fixing means and the first skeleton member as the battery pack fixing means moves relative to the first skeleton member in the vehicle width direction. Features.

  According to a second aspect of the present invention, there is provided the battery pack protection structure for a vehicle according to the first aspect, wherein the battery pack support means is a cable-shaped member or an urging member, and the total length of the battery pack support means is the vehicle width direction. When supported together with the battery pack fixing member on the other side, the lower end on one side in the vehicle width direction of the battery pack has a length located above the road surface, and the upper end on one side in the vehicle width direction of the battery pack is The length is located below the first skeleton member.

  According to a third aspect of the present invention, there is provided the battery pack protection structure for a vehicle according to the first or second aspect, wherein the battery pack fixing means includes a battery pack fixing portion fixed to the upper surface of the battery pack and the first A battery pack mounting bracket having an anchor mounting surface opposed to the lower surface of the skeleton member and a load receiving surface extending downward from the vehicle width direction outer side of the anchor mounting surface; and fixed to the anchor mounting surface, the anchor A base portion extending from the attachment surface toward the first skeleton member, and an anchor provided with a projecting portion projecting outward from the distal end of the base portion in the vehicle width direction, the first skeleton member on the lower surface The battery pack has a hole through which the anchor can be inserted, and the battery pack has a battery pack mounting block. Wherein the projecting portion of the anchor through the socket is detachably secured to said first frame member by being engaged with the edge of the hole.

  Further, in the battery pack protection structure for a vehicle according to a fourth invention, in the third invention, when the first skeleton member increases the ground clearance of the side portion of the vehicle body by the vehicle height adjusting means, The lower surface on the side portion side where the vehicle body is raised is formed to be horizontal.

  The battery pack protection structure for a vehicle according to a fifth aspect of the present invention is the battery pack protection structure according to the fourth aspect, wherein the battery pack mounting bracket is configured such that when the ground height of the side portion of the vehicle body is increased by the vehicle height adjusting means, The load receiving surface on the side portion side where the vehicle body is raised is formed to be vertical.

  According to a sixth aspect of the present invention, there is provided the battery pack protection structure for a vehicle according to any one of the first to fifth aspects, wherein the lower end of the battery pack mounting bracket is positioned lower than the lower end of the battery pack. It is characterized by.

  According to a seventh aspect of the present invention, there is provided the vehicle battery pack protection structure according to any one of the first to sixth aspects, wherein a plurality of the battery pack fixing means are provided in the vehicle front-rear direction.

  According to the battery pack protection structure for a vehicle according to the present invention, in a vehicle provided with a vehicle height adjusting means for changing the ground height on the side of the vehicle body, the ground height on the collision side of the vehicle body is made higher than usual. Even when a side collision occurs, the battery pack can be more appropriately protected.

1 is a front view schematically illustrating a vehicle body structure to which a vehicle battery pack protection structure according to an embodiment of the present invention is applied. 1 is a bottom view schematically showing a vehicle body structure to which a vehicle battery pack protection structure according to an embodiment of the present invention is applied. It is a block diagram which shows the structure of the vehicle height adjustment control in embodiment of this invention. It is a mimetic diagram showing the battery pack protection structure of vehicles concerning the embodiment of the present invention. It is an image figure which shows the operation | movement at the time of the side collision of the vehicle shown in FIG. It is a schematic diagram which shows the operation | movement at the time of the collision initial stage of the battery pack protection structure of the vehicle which concerns on embodiment of this invention. It is a schematic diagram which shows the operation | movement in the middle stage of a collision of the battery pack protection structure of the vehicle which concerns on embodiment of this invention. It is a schematic diagram which shows the operation | movement of the anchor at the time of a side collision.

  A vehicle battery pack protection structure according to an embodiment of the present invention will be described with reference to FIGS. 1 to 7.

  A vehicle 1 shown in FIGS. 1 and 2 includes a battery pack 11 in which a plurality of batteries (storage batteries) are housed in a case, and an electric motor (illustrated) mounted on the vehicle 1 using electric power stored in the batteries. (Omitted) is an electric vehicle that travels, and when a side collision of another vehicle 100 (see FIG. 5) with the vehicle 1 is expected, the side on which the vehicle 1 is expected to collide (hereinafter referred to as a collision) The vehicle height adjusting device 12 (see FIG. 3) is provided to increase the ground height of the side) compared to the normal time.

  As shown in FIGS. 1 and 2, the vehicle 1 includes a pair of left and right floor side members (first skeleton members) 13 </ b> A and 13 </ b> B extending in the vehicle front-rear direction and vehicle widths of the floor side members 13 </ b> A and 13 </ b> B as skeleton members. A pair of left and right side sills 14A, 14B extending along the vehicle longitudinal direction on the outside in the direction (side of the vehicle body), and cross members (second skeleton members) 15A-15C bridged between the side sills 14A, 14B are included. Yes.

  The battery pack 11 is disposed between the floor side members 13A and 13B and below the floor (below the floor panel 16). The battery pack 11 is detachably attached to the floor side members 13A and 13B via battery pack attachment brackets 17A and 17B, which will be described in detail later, at a plurality of locations along the vehicle longitudinal direction.

  The vehicle height adjustment device 12 adjusts the ground height on the collision side of the vehicle 1 by using, for example, a shock absorber interposed between the vehicle body and the wheels. As shown in FIG. A vehicle height adjusting device 12A and a left vehicle height adjusting device 12B are provided.

  The vehicle height adjusting device 12 is controlled by an electronic control unit (ECU) 20. The electronic control unit 20 is installed on both sides of the vehicle 1 and is input from a collision prediction sensor 21 (a right collision prediction sensor 21A and a left collision prediction sensor 21B) that detects an object approaching from the side of the vehicle 1. If the possibility of collision is predicted based on (detection result) and it is predicted that there is a possibility of collision, the vehicle height adjustment device 12 (for example, another vehicle 100 may collide with the right side of the vehicle). When the vehicle height is predicted, the right vehicle height adjustment device 12A is compared. When it is predicted that the other vehicle 100 may collide with the left side of the vehicle, the left vehicle height adjustment device 12B) Make it high.

  Next, the protection structure of the battery pack 11 will be described in detail with reference to FIG. Note that the protection structure of the battery pack 11 is provided symmetrically on the left and right sides of the vehicle 1, and only the one side in the left and right direction of the vehicle 1 will be described here.

  As shown in FIG. 4, in the present embodiment, the battery pack 11 is detachably fixed to the floor side member 13A via the battery pack mounting bracket 17A and the anchor 19A, and the floor panel 16 is supported by the battery pack support member 18. It can be suspended and supported.

  Here, the battery pack mounting bracket 17A is formed by, for example, processing a plate body, and extends in parallel to the upper surface of the battery pack 11, and the battery pack side fixing portion 17a on the outer side in the vehicle width direction of the battery pack side fixing portion 17a. A communication portion 17b extending downward from the end edge and a cylindrical portion 17c formed in a cylindrical shape from the lower portion of the communication portion 17b toward the outside in the vehicle width direction are provided.

  Here, the lower surface (hereinafter referred to as the floor side member lower surface) 13b of the floor side member 13A is formed to be horizontal when the ground height of the side portion of the vehicle body is increased by the right vehicle height adjusting device 12A. And the upper surface (henceforth cylindrical surface upper surface) 17ca of the cylindrical part 17c as an anchor attachment surface is formed so that it may become parallel with respect to the floor side member lower surface 13b, and in the position facing the floor side member lower surface 13b. It is arranged (see FIG. 6A).

  Further, an outer surface (hereinafter referred to as a cylindrical portion outer surface) 17cb of the cylindrical portion 17c as a load receiving surface is orthogonal to the cylindrical portion upper surface 17ca, that is, the right vehicle height adjusting device 12A It is formed to be vertical when the ground clearance of the side portion is increased (see FIG. 6A).

  Further, the lower end of the cylindrical portion 17 c is configured to be positioned below the lower surface (lower end) 11 b of the battery pack 11.

  The anchor 19A includes a base portion 19a extending in a direction substantially orthogonal to the cylindrical portion upper surface 17ca, and a protruding portion 19b extending in parallel with the cylindrical portion upper surface 17ca from the tip of the base portion 19a. The anchor 19A is fixed to the cylindrical portion upper surface 17ca in a state where the protruding portion 19b is directed outward in the vehicle width direction.

  Further, a long hole 13a extending along the vehicle width direction is formed in the floor side member lower surface 13b. The long hole 13a has a size that allows the anchor 19A to be inserted therethrough.

  That is, the battery pack 11 is removably supported (fixed) on the floor side member 13A by inserting the anchor 19A into the elongated hole 13a and locking the protruding portion 19b to the edge of the elongated hole 13a.

  The battery pack support member 18 is a cord-like member (for example, a string) or an urging member (for example, a spring), and one end is fixed to the lower surface 16 a of the floor panel 16 and the other end is the battery pack 11. It is fixed to the upper surface (hereinafter referred to as the battery pack upper surface) 11a. The battery pack support member 18 has a total length when the battery pack 11 is supported only by the battery pack mounting bracket 17B and the anchor 19B on the other side in the vehicle width direction, and the battery pack support member 18. Preferably, the lower end of the battery pack 11 is not long in contact with the road surface and is as close as possible to the road surface so that the upper end on one side in the width direction is positioned at least below the floor side member 13A. It is set to be. The battery pack support member 18 is stored in a state where no tension is applied between the floor panel 16 and the battery pack upper surface 11a in a normal state.

  Hereinafter, the operation of the battery pack protection structure for a vehicle according to the present embodiment will be described with reference to FIGS.

  In the present embodiment, when the electronic control unit 20 predicts a side collision with the vehicle 1 of the other vehicle 100 based on information input from the collision prediction sensor 21, the vehicle is arranged such that the ground clearance on the side collision side of the vehicle body becomes high. The high adjustment device 12 is controlled. Thus, when a side collision occurs with the ground height of the side portion on the collision side of the vehicle 1 increased, the cylindrical portion of the battery pack mounting bracket 17A as shown in FIG. A load is input to the outer side surface 17cb, and the battery pack mounting bracket 17A moves inward in the vehicle width direction relative to the floor side member 13A.

  As a result, the anchors 19A fixed to all the battery pack mounting brackets 17A on the collision side move inward in the vehicle width direction relative to the long holes 13a, respectively. As shown in FIG. 6B, the battery pack 11 is released from the collision side floor side member 13A via the battery pack mounting bracket 17A.

  As described above, when the battery pack mounting bracket 17A is released from the floor side member 13A, the battery pack 11 is supported only by the anchor and the battery pack support member 18 on the side opposite to the collision side.

  Here, as described above, in the vehicle battery pack protection structure according to the present embodiment, when the ground height of the side portion on the collision side of the vehicle body is increased by the vehicle height adjusting device 12 as compared with the normal time, the floor The side member lower surface 13b is horizontal, and the cylindrical portion outer surface 17cb of the battery pack mounting bracket 17A is vertical. Therefore, when another vehicle 100 collides with the vehicle 1 and a load is input to the battery pack mounting bracket 17A, the anchor 19A moves in the horizontal direction via the battery pack mounting bracket 17A. The battery pack mounting bracket 17A can be released from the elongated hole 13a and released from the floor side member 13A.

  Further, the battery pack mounting bracket 19A is configured such that its lower end protrudes downward from the battery pack lower surface 11b. Therefore, when the battery pack 11 is released from the floor side member 13A, for example, a battery Even if the pack 11 swings, the battery pack 11 can be prevented from colliding with the road surface and being damaged.

  Further, since the total length of the battery pack support member 18 is set such that the lower end of the battery pack 11 does not contact the road surface and is as close as possible to the road surface, the side sill 14A and the floor panel 16 are Even if the battery pack 11 is deformed, it is possible to infiltrate the space above the battery pack 11 so that the battery pack 11 can be protected, and for the other vehicle 100, the battery is between the vehicle body and the road surface. The pack 11 can be allowed to enter, and the battery pack 11 can be prevented from being damaged.

  Thus, according to the battery pack protection structure for a vehicle according to the present embodiment, in the vehicle 1 including the vehicle height adjustment device 12 for changing the ground height of the vehicle body side portion, the ground on the side portion on the collision side of the vehicle body is provided. The battery pack 11 can be more appropriately protected even when a side collision occurs with the height being higher than normal.

  Note that the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made without departing from the spirit of the present invention.

  For example, in the above-described embodiment, the total length of the battery pack support member 18 is set such that the lower end of the battery pack 11 does not contact the road surface and is as close as possible to the road surface. Although shown, the total length of the battery pack support member 18 is at least the upper end on the other side in the vehicle width direction when the battery pack 11 is supported only by the battery pack mounting bracket 17A and the battery pack support member 18 on one side in the vehicle width direction. May be set so as to be positioned below the floor side member 13A.

  In this embodiment, the battery pack 11 is detachably fixed to the floor side members 13A and 13B. However, the battery pack 11 is detachably fixed to other skeleton members such as the side sills 14A and 14B. Also good.

  In the above-described embodiment, an example in which one end of the battery pack support member 18 is fixed to the floor panel 16 is shown. However, one end of the battery pack support member 18 is another skeleton member such as one of the cross members 15A to 15C. It may be fixed to.

  Further, in the above-described embodiment, the example including the anchor 19A as the battery pack fixing means has been described. However, with relative movement inward in the vehicle width direction with respect to the floor side members 13A and 13B (or a skeleton member such as a side sill). As long as the fixed state between the floor side members 13A and 13B (or a skeleton member such as a side sill) can be released, another structure may be used.

DESCRIPTION OF SYMBOLS 1 Vehicle 11 Battery pack 11a Battery pack upper surface 11b Battery pack lower surface 12 Vehicle height adjusting device 12A Right vehicle height adjusting device 12B Left vehicle height adjusting device 13A, 13B Floor side member 13a Long hole 13b Floor side member lower surface 14A, 14B Side sill 15A- 15C Cross member 16 Floor panel 16a Floor panel lower surface 17A, 17B Battery pack mounting bracket 17a Battery pack side fixing portion 17b Communication portion 17c Tubular portion 17ca Tubular portion upper surface 17cb Tubular portion outer surface 18 Battery pack support member 19A, 19B Anchor 19a Base 19b Protrusion 20 Electronic control device 21 Collision prediction sensor 21A Right collision prediction sensor 21B Left collision prediction sensor 100 Other vehicle

Claims (7)

A sensor for detecting an object approaching from the side of the host vehicle, a vehicle height adjusting unit capable of adjusting the ground height of the side portion of the vehicle body, and a control unit for controlling the vehicle height adjusting unit based on a detection result by the sensor And a battery pack protection structure for a vehicle having a battery pack disposed under the floor of the vehicle body,
Battery pack fixing means disposed on both sides of the battery pack in the vehicle width direction, and detachably fixing the battery pack to a first skeleton member extending along the vehicle longitudinal direction on both sides of the vehicle in the vehicle width direction;
Battery pack support means capable of supporting the battery pack in a suspended manner on a second skeleton member or a floor panel extending along the vehicle width direction of the vehicle,
The battery pack fixing means is released from the fixed state with the first skeleton member as the battery pack fixing means moves relative to the first skeleton member inward in the vehicle width direction. The battery pack protection structure of the vehicle characterized by this. The battery pack support means is a cord-like member or an urging member, and the total length of the battery pack is one side in the vehicle width direction of the battery pack when the battery pack is supported together with the battery pack fixing member on the other side in the vehicle width direction. The lower end of the battery pack has a length that is positioned above the road surface, and the upper end on one side in the vehicle width direction of the battery pack has a length that is positioned below the first skeleton member. The battery pack protection structure for a vehicle according to claim 1. The battery pack fixing means includes
A battery pack fixing portion fixed to the upper surface of the battery pack; an anchor mounting surface disposed opposite to the lower surface of the first skeleton member; and a load receiving surface extending downward from the vehicle width direction outside the anchor mounting surface. A battery pack mounting bracket with
An anchor that is fixed to the anchor mounting surface and that extends from the anchor mounting surface toward the first skeleton member, and an anchor that protrudes outward from the distal end of the base portion in the vehicle width direction;
The first skeleton member has a hole through which the anchor can be inserted on the lower surface,
The battery pack is detachably fixed to the first skeleton member by locking the protrusion of the anchor to an edge of the hole through the battery pack mounting bracket. The battery pack protection structure for a vehicle according to claim 1 or 2. The first skeleton member is formed such that when the ground height of the side portion of the vehicle body is increased by the vehicle height adjusting means, the lower surface of the side portion side where the vehicle body is raised is horizontal. The battery pack protection structure for a vehicle according to claim 3, wherein: The battery pack mounting bracket is formed such that when the ground height of the side portion of the vehicle body is increased by the vehicle height adjusting means, the load receiving surface on the side portion side where the vehicle body is raised is vertical. The vehicle battery pack protection structure according to claim 4, wherein The battery pack protection structure for a vehicle according to any one of claims 1 to 5, wherein a lower end of the battery pack mounting bracket is positioned lower than a lower end of the battery pack. The battery pack protection structure for a vehicle according to any one of claims 1 to 6, wherein a plurality of the battery pack fixing means are provided in the vehicle front-rear direction.

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