CN210416249U

CN210416249U - Battery pack for vehicle

Info

Publication number: CN210416249U
Application number: CN201921218636.8U
Authority: CN
Inventors: 土屋豪范; 依田武仁; 井上重行; 后藤雄太郎; 渡边广隆
Original assignee: Toyota Motor Corp
Current assignee: Toyota Motor Corp
Priority date: 2019-07-30
Filing date: 2019-07-30
Publication date: 2020-04-28
Anticipated expiration: 2029-07-30

Abstract

The utility model provides a vehicle battery pack. The battery pack for a vehicle is provided under a floor of the vehicle, and includes a battery module including a plurality of lower-layer battery stacks arranged on a lower layer and a plurality of upper-layer battery stacks arranged on an upper layer, the plurality of lower-layer battery stacks are arranged in a vehicle length direction on a lower frame, the plurality of upper-layer battery stacks are arranged in the vehicle length direction on an intermediate frame, the intermediate frame is erected above rear regions of a row of the plurality of lower-layer battery stacks, and the battery module is fixed such that end portions on both sides in a vehicle width direction of the intermediate frame are located outside end edges on both sides in the vehicle width direction of the upper-layer battery stacks. In the case where the left or right end of the intermediate frame in the vehicle battery pack is collided with by the oncoming vehicle at the time of a side collision of the vehicle on which the vehicle battery pack is mounted, the upper cell stack disposed on the intermediate frame is displaced in the same direction as the direction in which the collision load acts, and is less likely to be damaged, and thus can be effectively protected.

Description

Battery pack for vehicle

Technical Field

The utility model relates to a set up automobile-used group battery under vehicle floor.

Background

In general, in an electric vehicle having only a motor as a drive source or a hybrid vehicle having an engine and a motor as drive sources, a battery pack having a flat shape is often disposed under a center floor of the vehicle.

In recent years, in order to extend the cruising distance of a vehicle as much as possible, it is necessary to increase the capacity of a battery pack. In view of this, the inventors of the present application have proposed a battery pack configured with upper and lower two-layer cell stacks. Specifically, the battery pack includes a plurality of lower-stage cell stacks arranged in a lower stage in a vehicle length direction (in a state where the battery pack is mounted on a vehicle), and a plurality of upper-stage cell stacks arranged in the vehicle length direction and disposed above rear portions of the plurality of lower-stage cell stacks, and a length dimension in the vehicle length direction of the battery pack is larger than a width dimension in the vehicle width direction in the state where the battery pack is mounted under a vehicle floor. The battery pack can fully utilize the space under the floor of the vehicle to enlarge the capacity of the battery pack.

However, in the above battery pack, the upper cell stack is easily damaged when the vehicle is subjected to a side collision, and if a dedicated protection member is provided for the upper cell stack, the arrangement space of the cell stack is reduced. It is therefore necessary to ensure that the upper cell stack is effectively protected in the event of a vehicle side collision, as far as possible, without adding a dedicated protective member.

SUMMERY OF THE UTILITY MODEL

In view of the above, an object of the present invention is to provide a vehicle battery pack that can be effectively protected against a side collision of a vehicle without adding a dedicated protection member.

As a technical scheme who solves above-mentioned technical problem, the utility model provides a vehicle battery group, this vehicle battery group are set up under the floor of vehicle, its characterized in that: the battery module is provided with a battery module composed of a plurality of lower layer battery stacks arranged at a lower layer and a plurality of upper layer battery stacks arranged at an upper layer, wherein the plurality of lower layer battery stacks are arranged on a lower frame along the vehicle length direction, the plurality of upper layer battery stacks are arranged on an intermediate frame along the vehicle length direction, the intermediate frame is erected above the rear area of the array of the plurality of lower layer battery stacks, and the battery module is fixed in a way that the end parts at two sides of the intermediate frame in the vehicle width direction are positioned at the outer sides of the end edges at two sides of the upper layer battery stacks in the vehicle width direction.

Based on the above-mentioned automobile-used group battery, under the condition that the vehicle that installs this automobile-used group battery takes place the side impact, if left end or the right-hand member of middle frame in the automobile-used group battery are collided by the other side vehicle, then the collision load at first acts on the left end portion or the right-hand member portion of middle frame, and the upper strata battery pile of configuration on the middle frame can be towards the same direction displacement with the effect direction of collision load, so be difficult to with the other side vehicle direct impact, can prevent that the upper strata battery pile is impaired. Therefore, adopt the utility model discloses an above-mentioned automobile-used group battery even if do not add special protection component, upper battery stack also can receive effectual protection when the vehicle takes place the side impact. As a result, the battery arrangement space can be saved, and the equipment cost can be reduced.

In addition, in the above vehicle battery pack of the present invention, it is preferable that the left end portion and the right end portion of the upper cell stack in the vehicle width direction on the middle frame are respectively fixedly connected to the left end portion and the right end portion of the middle frame through an upper support, and the left end portion and the right end portion of the lower cell stack in the vehicle width direction on the lower frame are respectively fixedly connected to the left end portion and the right end portion of the lower frame in the vehicle width direction through a lower support, the left end portion of the middle frame and the left end portion of the lower frame are respectively fixedly connected to a left side support member, and the right end portion of the middle frame and the right end portion of the lower frame are respectively fixedly connected to a right side support member. With this configuration, the upper cell stack and the lower cell stack in the battery module can be firmly fixed to the lower frame and the intermediate frame, and the left support member and the right support member are further fixed to the outer sides of the end portions on both sides of the intermediate frame, so that the upper cell stack can be more effectively protected in the event of a side collision of the vehicle.

Drawings

Fig. 1 is an exploded perspective view showing a schematic configuration of a vehicle battery pack according to an embodiment of the present invention.

Fig. 2 is a side view of the battery module of fig. 1.

Fig. 3 is a side view showing a state in which the battery pack of fig. 1 is mounted on a vehicle.

Fig. 4 is a sectional view in the direction of arrows of the line (4) - (4) section in fig. 3.

Fig. 5 is a perspective view showing a cell stack disposed in an upper layer of the battery module.

Fig. 6 is a perspective view showing the intermediate frame in fig. 5.

Detailed Description

Hereinafter, a vehicle battery pack according to an embodiment of the present invention will be described with reference to the drawings.

Fig. 1 is an exploded perspective view showing a schematic configuration of a vehicle battery pack 1 (hereinafter, simply referred to as a battery pack 1) according to the present embodiment. In fig. 1 and the following drawings, an arrow Fr indicates the front side of the battery pack 1; the arrow Rr represents the rear side of the battery pack 1; arrow Lh represents the left side of the battery pack 1; arrow Rh indicates the right side of the battery pack 1; the arrow Up indicates the upper side of the battery pack 1. In the present embodiment, the vehicle to which the battery pack 1 is attached is, for example, an electric vehicle using only a motor as a drive source, or a hybrid vehicle using an engine and a motor as drive sources.

As shown in fig. 1, the battery pack 1 includes a case 2, a lid 3, a battery module 4, and the like. The battery pack 1 has a flat shape as a whole, and has a length dimension in the vehicle longitudinal direction larger than a width dimension in the vehicle width direction in a state of being mounted on a vehicle.

The battery pack 1 is disposed under a floor (for example, under a middle floor) of a vehicle (not shown). Fig. 3 is a side view showing a state where the battery pack 1 is mounted on a vehicle, and fig. 4 is a cross-sectional view in an arrow direction of a cross-section taken along the line (4) - (4) in fig. 3. As shown in fig. 3 and 4, the battery pack 1 is disposed inside the floor side member 21 on the left and right sides of the vehicle and below the rear cross member 22.

In the state where the battery pack 1 is mounted under the floor of the vehicle as described above, the front, rear, left, right, and up-down directions of the battery pack 1 coincide with the front, rear, left, right, and up-down directions of the vehicle.

As shown in fig. 1, case 2 is formed in a tray shape, battery module 4 is housed in case 2, and the opening on the upper side of case 2 is covered with lid 3.

Fig. 2 is a side view of the battery module 4 of the battery pack 1. As shown in fig. 2, the battery module 4 is composed of a plurality of battery stacks 6A arranged in the vehicle length direction on the lower frame 5 (i.e., the lower battery stack arranged at the lower stage), and three battery stacks 6B arranged in the vehicle length direction on the intermediate frame 8 above the rear region (the last three battery stacks 6A) of the row of the plurality of battery stacks 6A (i.e., the upper battery stack arranged at the upper stage).

Although not shown in detail, each of the cell stack 6A and the cell stack 6B includes a plurality of cells arranged in the width direction, a bus bar module for connecting the cells in series, and an exhaust pipe for guiding the gas discharged from the cells to the outside. The battery cell is, for example, a secondary lithium ion battery such as a lithium ion battery or a nickel hydride battery, or a nickel hydride battery.

The rear regions of the plurality of cell stacks 6A occupy about 1/3 of the entire length of the battery module 4. A middle frame 8 provided with three cell stacks 6B is erected above the rear region.

Fig. 5 is a perspective view showing the cell stack 6B arranged in the upper layer of the battery module 4, and fig. 6 is a perspective view showing the intermediate frame 8. As shown in fig. 6, the intermediate frame 8 has a plurality of (four) cross members 8A that carry the cell stack 6B and edge members 8B that connect these cross members 8A.

As shown in fig. 5, the three cell stacks 6B are arranged on the intermediate frame 8, and the left end portion of the cell stack 6B and the left side member 8B of the intermediate frame 8 are fixed to the bracket 10 (upper bracket) in a state where the side member 8B of the intermediate frame 8 protrudes outward in the vehicle width direction with respect to the end edge of each cell stack 6B. Similarly, the right end of the cell stack 6B and the side member 8B on the right side of the intermediate frame 8 are fixed to the same bracket (not shown) as the bracket 10.

On the other hand, as shown in fig. 2, the left end portion of the cell stack 6A disposed in the lower stage and the left end portion of the lower frame 5 are fixed to the bracket 11 (lower stage bracket), respectively. Here, the holder 11 has the same structure as the above-described holder 10. Similarly, the right end of the cell stack 6A and the right end of the lower frame 5 are fixed to the same holder (not shown) as the holder 11.

As shown in fig. 4, a support member 7A and a support member 7B for supporting the cell stack 6A from the outside are provided on the left and right sides of the cell stack 6A disposed below the cell stack 6B, respectively.

The lower portion of the left support member 7A and the left end portion of the lower frame 5 are fixedly connected by a fastening member such as a bolt, and the upper portion of the left support member 7A and the left end portion of the middle frame 8 are fixedly connected by a fastening member such as a bolt.

The right support member 7B has the same structure as the left support member 7A, and the lower portion of the right support member 7B and the right end portion of the lower frame 5 are fixedly connected by a fastening member such as a bolt, while the upper portion of the right support member 7B and the right end portion of the intermediate frame 8 are fixedly connected by a fastening member such as a bolt.

As shown in fig. 4, the battery module 4 is fixed such that the left and right ends of the lower frame 5 and the middle frame 8 in the vehicle width direction are located outside the left and right ends of the

battery stacks

6A and 6B mounted thereon in the vehicle width direction.

In the vehicle battery pack 1 of the present embodiment having the above-described configuration, since the

cell stacks

6A and 6B arranged on the lower and upper layers of the battery module 4 are firmly fixed to the lower frame 5 and the intermediate frame 8 via the support member 7A and the support member 7B, not only can the vibration of the battery module 4 be suppressed, but also, in the case of a side collision of the vehicle to which the battery pack 1 is attached, when the left or right end of the intermediate frame 8 is collided with the opponent vehicle, the collision load first acts on the left or right end portion of the intermediate frame 8 (i.e., the side sill 8B), and the cell stack 6B arranged on the intermediate frame 8 is displaced in the same direction as the direction in which the collision load acts, so that it is difficult to directly collide with the opponent vehicle, and damage to the cell stack 6B can be prevented.

Therefore, with the battery pack 1 having the above-described configuration, even if no dedicated protection member is added, it can be effectively protected in the event of a side collision of the vehicle. As a result, the space for disposing the battery module can be saved, and the equipment cost can be reduced.

Claims

1. A battery pack for a vehicle, which is provided under a floor of a vehicle, characterized in that:

comprises a battery module composed of a plurality of lower layer cell stacks arranged at a lower layer and a plurality of upper layer cell stacks arranged at an upper layer,

the plurality of lower cell stacks are arranged on the lower frame along the vehicle length direction,

the plurality of upper cell stacks are arranged on the middle frame along the vehicle length direction,

the intermediate frame is erected over a rear region of the array of the plurality of lower cell stacks,

the battery module is fixed such that end portions on both sides in the vehicle width direction of the intermediate frame are positioned outside end edges on both sides in the vehicle width direction of the upper cell stack.

2. The vehicular battery pack according to claim 1, characterized in that:

left and right ends of the upper cell stack disposed on the intermediate frame in the vehicle width direction are fixedly connected to left and right ends of the intermediate frame via upper brackets, respectively,

left and right ends in the vehicle width direction of the lower cell stack disposed on the lower frame are fixedly connected to left and right ends in the vehicle width direction of the lower frame via lower brackets, respectively,

the left end portion of the middle frame and the left end portion of the lower frame are fixedly connected to a left side support member,

the right end portion of the middle frame and the right end portion of the lower frame are fixedly connected to a right side support member, respectively.