JP2020083297A - Vehicle mounting structure of battery - Google Patents

Abstract

To provide a vehicle mounting structure of a battery which is effective for achieving saving of a battery mounting space, achieves high protection effect, and can provide a temperature control function.SOLUTION: A vehicle mounting structure of a battery has battery module bodies each comprising batteries and protection members, each of which is disposed on a bottom surface or/and a side surface of the battery. The multiple battery module bodies are continuously arranged in lines in a case body.SELECTED DRAWING: Figure 1

Description

The present invention relates to a battery mounting structure mounted as a drive source for electric vehicles, hybrid vehicles, and the like.

In the fields of electric vehicles and hybrid vehicles, driving secondary batteries are mounted.
In order to extend the distance that can be traveled on a single charge, more batteries will be installed.
On the other hand, weight reduction of vehicles is also required.

For example, Patent Document 1 discloses a battery mounting structure for an electric vehicle in which a battery tray in which a plurality of closed cross-section portions are continuously provided can be temporarily fixed to a frame member of the vehicle.
However, this may limit the battery mounting site and space to the skeleton of the vehicle, and may increase the battery mounting space.

Patent Document 2 discloses a battery cooling system in which battery cells are stacked on a cooler having a plurality of cooling channels inside, but the protection of the battery cells from the outside becomes insufficient.

JP-A-7-323736 JP, 2018-127087, A

It is an object of the present invention to provide a battery mounting structure for a battery, which is effective in reducing the space for mounting the battery, has a high protection effect, and is capable of providing a temperature control function.

The present invention is a battery mounting structure for a vehicle, comprising a battery and a battery module body comprising a protective member arranged on a bottom surface and/or a side surface of the battery, and a plurality of the battery module bodies are continuously connected to a case body. It is characterized by being arranged in.

Here, the battery means a secondary battery that can be repeatedly used by charging, and a substantially rectangular parallelepiped battery pack in which a plurality of battery cells are stacked is used.
In the present invention, the battery module body refers to an integrated body of this battery and a protective member arranged on the bottom surface and/or the side surface.

When the battery module body in which the battery and the protective member are integrated is previously formed in this manner, a plurality of battery module bodies can be continuously arranged so as to be spread inside the case body.
As a result, they can be efficiently arranged inside the case body, the mounting space can be saved, and the impact from the outside can be easily absorbed through the protective member.

The shape of the protective member may be the entire bottom surface of the battery or only the side surface, but in order to protect from both the external force from the lower side and the external force in the left-right direction, the protective member is located on the bottom surface and the side surface of the battery. It is preferable that it has a substantially L-shaped cross section or a substantially recessed cross section.

Further, in the present invention, if the protective member has a hollow cross-sectional shape, not only the protective effect of the battery is improved, but also the refrigerant is allowed to flow using this hollow portion, or the temperature control function is achieved by inserting a heat exchanger. It can also be given.
In the present invention, the protective member may have a radiation fin portion.

In the present invention, the case body is for arranging a plurality of battery module bodies inside thereof.
The case body can adopt various structures as long as it can be arranged so that a plurality of battery module bodies are continuously spread, but when mounted on the floor of a vehicle, the bottom side of the case body is exposed to the outside of the vehicle. A mode of doing is also possible.
In such a case, the case body has an accommodating portion including a bottom member and a frame-shaped side wall portion provided upright from the bottom member, and a plurality of the battery module bodies are arranged in the accommodating portion. Preferably.
Here, there is no limitation on the shape of the frame forming the side wall portion, but as a shape that can easily accommodate the substantially rectangular parallelepiped battery module body, a rectangular shape in which both end portions of the front member and the rear member are connected by the left and right side members is used. It may be.

When the frame has a rectangular shape, a reinforcing member for absorbing an external impact can be arranged along the side wall portion of the case body in the front, rear, left and right of the case body, and only in a necessary portion. The reinforcing member may be arranged so as to partition the accommodating portion.

In the structure for mounting the battery according to the present invention on the vehicle, since the battery and the protective member thereof are integrated in advance, it is possible to arrange a plurality of them in the case body, which saves space. Can be planned.
When the protective member is provided with a hollow portion, a temperature adjusting function can be imparted by passing a fluid through the hollow portion, and a radiating fin may be provided.
The reinforcing member can be arranged at a necessary portion of the case body.
For example, when the case body is formed of the bottom member and the frame-shaped side wall portion provided upright from this, it is easy to ensure watertightness from the outside, and the effect of protecting against external force applied from the bottom portion and the side wall portion is high.

A structural example in which a battery module body in which a battery and a protective member are integrated is housed in a case body is shown in (a), and (b) shows a state in which the battery and the protective member are separated. The sectional view on the AA line of FIG. 1 is shown. The BB sectional drawing of FIG. 1 is shown. It is sectional drawing which showed the positional relationship of a battery and a protection member, (a) shows a separated state, (b) shows a connection state. A sectional view of a portion of a reinforcing member is shown. The structural example of a case body is shown. The exploded view of a case body is shown. (A), (b) shows the example of a cooling structure. An example in which a heat exchange member is directly arranged on the bottom of the battery is shown. Example 2 of a protection member is shown. The sectional view of Example 2 is shown. The example of connection of a battery and a protection member is shown, (a) is a top view, (b) shows CC sectional view taken on the line. The relationship between a protection member and a cover is shown.

A configuration example of a case body and a battery module body for mounting a battery on a vehicle will be described below with reference to the drawings.
FIG. 1A shows a state in which a plurality of battery module bodies 10 are arranged in a housing portion inside a case body 20.
FIG. 1B shows an example of integration of the battery 11 and the protection member 12.
The protective member 12 of the present embodiment is made of an extruded material of aluminum alloy and has a hollow cross-sectional shape with a substantially L-shaped outer shape.
The protection member 12 is composed of a base portion 12a that comes into contact with the bottom surface of the battery 11 and a side portion 12b that is erected so as to be bent from the base portion 12a, but the base portion 12a and the side portion 12b may be separate members. Alternatively, it may be integrated into an L-shape as in this embodiment.
Further, it may have a substantially recessed shape in which a pair of side portions 12b are provided upright so as to face the side portions on both sides of the base portion 12a.

The battery 11 is not limited in its structure such as a battery in which a plurality of battery cells are stacked and connected or a pack in which the battery cells are housed in a container, but in the present invention, the battery 11 and the protection member 12 are connected in advance. By doing so, there is an integrated point.

The case body 20 is composed of a plate-shaped bottom member 21 as shown in FIGS. 6 and 7, and a frame member connected thereto by welding 27 or the like as shown in FIG.
Since the side wall portion of the frame member is erected from the bottom member 21 in a frame shape, the bottom member 21 and the side wall portion can be joined to each other in a watertight state, and when the battery module is housed inside, rainwater and the like from the outside enter. Prevent.
The frame member is an example in which the front member 22 and the rear member 23 are arranged so as to face each other, and the respective end portions are connected by the side members 24 and 25.
In this embodiment, as shown in FIG. 6, a reinforcing member 33 having a hollow cross section is arranged as a center member in the central portion so as to divide the housing portion of the case body 20 into two areas.

In this embodiment, as shown in the sectional view taken along the line AA in FIG. 2 and the sectional view taken along the line BB in FIG. 3, all of the front member 22, the rear member 23, and the side members 24 and 25 are substantially U-shaped in cross section. It is composed of a bottom part (22a, 23a, 24a, 25a), a side part (22b, 23b, 24b, 25b) and an upper piece part (22c, 23c, 24c, 25c).
As a result, the reinforcing member can be arranged outside any of the front member 22, the rear member 23, and the side members 24 and 25.
Although the front member is on the front side of the vehicle, there is no limitation on the arrangement direction.
In this case, the reinforcing member can be arranged on the side surface in the direction in which the shock needs to be absorbed when the battery is mounted on the vehicle.
In the present embodiment, as shown in FIG. 7, reinforcing members 31 and 32 having a Japanese cross section are arranged along the outer sides of the side members 24 and 25 on both sides.
The frame member and the reinforcing member can be made of an extruded material of aluminum alloy.

The battery module body 10 is arranged so as to be continuously packed in the housing portion of the case body 20 as shown in FIG. 1 as shown in FIG.
Since the battery module body 10 in which the battery 11 and the protection member 12 are integrated is provided, the battery module bodies 10 are arranged so as to sequentially come into contact with each other only by sequentially arranging them in the housing portion of the case body, which saves space. It is possible to achieve both improvement and protection effect.
In this embodiment, the end portion 112a of the base portion 12a of the one protection member and the end portion 212a of the base portion 12a of the other protection member are arranged so as to partially overlap with each other or to abut each other. It is an example.

As shown in FIG. 1(b), the battery module body 10 has a mounting portion 25d such as a side member 25 as shown in FIG. 5 via a mounting hole 12e provided at an end portion of a base portion 12a, and a mounting portion 25d as shown in FIG. As shown, the reinforcing member (center member) 33 in the central portion may be arranged so as to be bridged between the mounting pieces 33d provided on the bottom side, and fixed by the bolts 26 or the like.

Since the protective member has a hollow cross-sectional shape, as shown in FIG. 8(a), the pipe member 40 and the closing member 41 form a refrigerant flow path in the vicinity of both end portions of one hollow part 12c, and As shown in FIG. 8(b), a cooling pipe including the pipe portion 42 and the heat exchanger 43 may be arranged in the hollow portion.
Further, as shown in FIG. 9, the heat exchange member 13 may be arranged so as to be in direct contact with the bottom surface of the battery 11.

10 and 11 show a second embodiment of the protective member 12 according to the present invention.
FIG. 10 is a perspective view and FIG. 11 is a sectional view.
The second embodiment is also one in which a plurality of battery module bodies 10 are arranged, but this embodiment is an example in which the protective member 12 is provided with various temperature control functions.
First, the heat sink 14 is attached to the upper surface of the base 12a.
The heat sink 14 facilitates mutual heat exchange between the temperature control fluid flowing in the hollow portion 12c and the bottom portion of the battery 11.
This is an example in which mounting ribs 12f and 12f of the heat sink 14 and positioning ribs 12g of the heat sink 14 are provided on the upper surface of the base portion 12a.
In this example, the heat conductive sheet 15 is interposed between the upper surface of the heat sink 14 and the bottom surface of the battery 11.
As shown in FIG. 12, the heat conductive sheet 15 is closely attached by the fastening force when the battery 11 is attached.

The second embodiment is an example in which the side portion 12b is also provided with a temperature control function.
This is an example in which a plurality of heat radiation fin portions 12i are formed on the outer surface of the side portion 12b.
Further, mounting pieces 12h, 12h for the heater and the extinguishing agent 16 are provided on the inner surface of the side portion 12b, and a sheet-shaped extinguishing agent or a plate member such as a heater can be attached if necessary. ..
For example, if the extinguishing agent is attached, it is possible to suppress the spread to other battery module bodies 10.

FIG. 12A is a plan view of the mounting end portion of the battery 11, and FIG. 12B is a sectional view taken along line CC of FIG.
A mounting bracket 11b is provided at an end of the battery 11, and the mounting bracket 11b has a substantially L-shaped cross section. In this example, the bolts 17 are used for fastening.
The protective member 12 and the case body are fastened with bolts 18.

In the second embodiment, as shown in FIG. 13, a resin frame member 11a is attached to the lower portion of the end of the battery 11, and the bottommost heat radiation fin portion 12j in which the frame member 11a is provided on the side portion 12b. It is pressed down from above.
With this configuration, when a load is applied from the upper side of the cover member 19 or the like, the load is transmitted to the base portion 12a side via the frame member 11a, so that the battery protection effect is high.
When the function of pressing the battery is added to the heat dissipation fin portion in this manner, the function of suppressing the vibration of the battery module body 10 and the function of controlling the temperature can be provided at the same time, and the number of parts and the space can be reduced.

10 Battery Module Body 11 Battery 12 Protective Member 20 Case Body 21 Bottom Member 22 Front Member 23 Rear Member 24 Side Member 25 Side Member 31 Reinforcing Member

Claims (6)

A battery module having a battery and a protective member disposed on the bottom surface and/or the side surface of the battery,
A structure for mounting a battery on a vehicle, wherein a plurality of the battery module bodies are continuously arranged in a case body. The vehicle mounting structure for a battery according to claim 1, wherein the protection member has a substantially L-shaped cross section or a substantially recessed cross section located on the bottom surface and the side surface of the battery. The battery mounting structure according to claim 1 or 2, wherein the protection member has a hollow cross-section and has a temperature control function. The vehicle mounting structure for a battery according to claim 1, wherein the protection member has a heat radiation fin portion. The case body has an accommodating portion including a bottom member and a frame-shaped side wall portion provided upright from the bottom member,
The vehicle mounting structure for a battery according to any one of claims 1 to 4, wherein a plurality of the battery module bodies are arranged in the housing portion. The battery mounting structure according to any one of claims 1 to 5, wherein the case body has a reinforcing member for absorbing an impact from the outside.

Images