JP3309609B2 - Battery frame structure for electric vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery frame structure for an electric vehicle.

[0002]

2. Description of the Related Art In an electric vehicle, a vehicle-mounted battery occupies a considerable weight and a mounting space. Therefore, a battery frame having a dedicated rigid structure is conventionally arranged below a vehicle body floor, and the battery frame is mounted on the battery frame. A plurality of batteries are mounted, and the batteries are hermetically stored between a vehicle body floor and a battery frame.

In the case where a plurality of batteries are hermetically stored between the battery frame and the vehicle body floor as described above, the batteries generate heat and the battery function deteriorates. As disclosed in JP-A-35023 and JP-A-5-193366, cooling air is introduced from the front of the battery frame and discharged from the rear of the battery frame to cool the battery. .

[0004]

The cooling air is circulated from the front to the rear in the battery frame. However, since the battery is placed on the bottom plate of the battery frame, the cooling air flows through the battery frame. It is difficult to reach the bottom side sufficiently, and the temperature of the cooling air rises while reaching the rear row side battery, making it difficult to uniformly cool the mounted battery as a whole.

[0005] In particular, in the case of a high-performance battery using lithium ion or the like as a main constituent material, the battery generates heat as a whole, so that effective cooling cannot be expected.

Therefore, the present invention can cool each of a plurality of batteries mounted in a battery frame as a whole, and can introduce cooling air to the rear row battery without increasing the temperature. An object of the present invention is to provide a battery frame structure of an electric vehicle that can uniformly cool a battery in a battery frame as a whole and further improve a cooling effect.

[0007]

According to a first aspect of the present invention, there is provided an intermediate frame that partitions the inside of the outer frame into a grid by an outer frame including front and rear, left and right frames, and a front and rear direction frame and a vehicle width direction frame. A frame having a bottom, wherein the battery is mounted on the front and rear frames, the vehicle width direction frame, and the front and rear adjacent vehicle width direction frames. The direction frame is assembled on the front-rear direction frame to form a ventilation path for cooling air introduced from the front of the battery frame below the battery and discharged from the upper rear part of the battery frame in the front-rear direction .
The battery mounting shelf is formed on the lower front and rear edges, while the front and rear
Battery mounting shelf at the intersection of the frame and the vehicle width direction frame
A notch deeper than the height of the
The frame is fitted and fixed .

[0008]

[0009] In the second aspect, before mounting of the battery mounting portion and the outer frame in the vehicle width direction frame of the intermediate frame according to claim 1, the battery mounting portion of the rear frame, the battery backward tilting state It is characterized in that an inclined surface is formed.

According to a third aspect of the present invention, a deflection guide portion for directing the cooling air flowing through the ventilation path upward and diverting the cooling air flowing through the ventilation path is provided at a position below the battery on the bottom plate according to the first and second aspects. And

[0011]

According to the first aspect, the cooling air introduced from the front of the battery frame forms a main flow in the front-rear direction in the ventilation path partitioned by the front-rear frame of the intermediate frame, and is adjacent to the front and rear from the main flow of the cooling air. The battery is circulated as a shunt from the lower side to the upper side of each battery and discharged from the upper rear part of the battery frame.

As a result, it is possible to supply the cooling air that has not exchanged heat to each battery from the front row to the rear row, so that each battery can be uniformly and entirely cooled.

Further, the battery is carried out to position the front-back direction by placing the battery mounting rack in the vehicle width direction frame, the battery mounting shelves are each other engaged crowded dropped into the notch in the front-rear direction frame Since the upper edge of the front-rear direction frame projects above the battery mounting shelf, the front-rear direction frame positions the battery in the vehicle width direction, and prevents the battery from shifting in the front-rear direction and the left-right direction. Can be fixed firmly.

According to the second aspect of the present invention , since the battery is mounted in a rearwardly inclined state, a branch of the cooling air flowing from the ventilation passage below the battery to the rearward and upward direction is blown at right angles to each battery. The cooling effect can be promoted.

According to the third aspect , the cooling air flowing from the front of the battery frame to the ventilation path below the battery is directed upward by the deflection guide section below each battery, and is diverted in the direction perpendicular to each battery. And the cooling effect can be promoted.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings.

1 and 2, reference numeral 1 denotes a bottomed battery frame on which a plurality of batteries B are mounted, and an outer frame 2 comprising front and rear frames 3, 4 and left and right frames 5, 6; Bottom plate 7 for closing the inner bottom of 2
And an intermediate frame 8 including a front-rear direction frame 9 that partitions the inside of the outer frame 2 into a lattice shape, and a vehicle width direction frame 10.

An outside air inlet 11 communicating with an outside air introduction duct 13 is formed in a lower portion of the front frame 3 of the outer frame 2.

The vehicle width direction frame 10 of the intermediate frame 8 is joined to the front and rear direction frame 9, and a ventilation path 12 connected to the outside air inlet 11 is formed below the battery B in the front and rear direction.

[0020] Battery B is each other and configured by focusing fix a plurality of cell B _c, the battery B is adjacent frames 3,
In the portion adjacent to the upper surface of the vehicle width direction frames 10, the battery mounting shelves 3a, 4a of the front and rear frames 3, 4 and the upper surface of the vehicle width direction frame 10 are mounted. And is fixed by clamp means (not shown).

As shown in FIG. 1, the battery frame 1 is fastened and fixed to a floor member 15 on the lower surface of a vehicle body floor 14 with bolts and nuts (not shown) via a sealing material, and the battery B is connected to the battery frame 1 and the vehicle body. Floor 14
A fan 16 and a discharge duct 17 are provided on a floor member 15 corresponding to the rear frame 4 of the outer frame 2 to discharge cooling air.

According to the structure of the embodiment described above, the outside air introduction duct 13 and the outside air inlet 11 in front of the battery frame 1 are provided.
The cooling wind introduced from the main frame A ₁ in the front-rear direction through the ventilation passage 12 partitioned by the front-rear frame 9 of the intermediate frame 8.
Is formed and circulates a diversion A ₂ directed upward through between the cells B _c from below of the battery B adjacent to the front and rear from the main flow A ₁ of the cooling air between the vehicle width direction frame 10, 10, The battery is discharged through the fan 16 and the discharge duct 17 at the upper rear part of the battery frame 1.

As a result, it is possible to supply the cooling air which has not exchanged heat to each battery B from the front row to the rear row, and to uniformly and entirely cool each battery B. The effect can be significantly improved.

In the embodiment shown in FIGS. 3 to 5, a battery mounting shelf 10a is formed at the lower front and rear edges of the vehicle width direction frame 10 so that the battery B is mounted on the battery mounting shelf 10a and clamped. is there.

On the other hand, a notch 9a deeper than the height of the battery mounting shelf 10a is formed in a portion of the front-rear direction frame 9 intersecting with the vehicle width direction frame 10, and the notch 9a is formed in the notch 9a. 10 is fitted and fixed by fitting.

A sealing member 18 is provided on the upper surface of the front-rear direction frame 9 to seal between the adjacent batteries B, B and between the battery B and the left and right frames 5, 6, so that the cooling air introduced into the ventilation passage 12 is provided. All of the wind circulates between the cells B _C of each battery B so that cooling can be performed without waste.

In FIG. 5, 19 is a side sill, 20 is an outrigger for connecting the floor member 15 and the side sill 19,
Reference numeral 21 denotes a cross member on the vehicle body floor 14.

According to the structure of this embodiment, each battery B is positioned on the battery mounting shelf 10a of the vehicle width direction frame 10 so as to be positioned in the front-rear direction. Since the battery B projects above the battery mounting shelf 10a, the battery B is positioned in the vehicle width direction by the front-rear direction frame 9, and
The battery B can be firmly fixed by preventing the battery B from moving forward, backward, left and right.

In the embodiment shown in FIGS. 6 and 7, the upper surface of the vehicle width direction frame 10 on which the battery B is mounted is formed in a stepped shape with a lower front side and a higher rear side. The shelves 2a and 4a are formed on inclined surfaces inclined backward.

Therefore, according to this embodiment, since the battery B is mounted in the rearwardly inclined state, the divided flow A _{2 of the} cooling air flowing from the ventilation passage 12 below the battery B to the rearward and upward direction.
Blows in a direction perpendicular to the longitudinal direction of each battery B, so that the cooling air can be distributed entirely on the peripheral side surface of each battery B, and the cooling effect can be promoted.

In the embodiment shown in FIGS. 8 and 9, a deflection guide 22 is provided below the battery on the bottom plate 7 to direct the cooling air flowing through the ventilation passage 12 upward and to diverge.

The deflection guide 22 is formed separately from the bottom plate 7.
Although it may be fixed on the top, it may be provided by embossing the bottom plate 7.

In this embodiment, the vehicle width direction frame 1
The front side of the 0 with the diversion A ₂ of the cooling air from below is formed on the curved surface so as to be Te smoothly guided upward,
The fins 23 and curved to follow this curved surface at the lower edge scoop up diversion A ₂ are then extended.

Therefore, also in this embodiment, the cooling air flowing from the front of the battery frame 1 to the ventilation path 12 below the batteries is directed upward by the deflection guide portion 22 below each battery B, and is divided. Blowing is performed in a direction substantially perpendicular to the longitudinal direction of each battery B, so that the battery cooling effect can be promoted.

[0035]

According to the first aspect of the present invention, the vehicle width direction frame of the intermediate frame is assembled on the front-rear direction frame, and the cooling air ventilation path is formed below the battery in the front-rear direction. The cooling air introduced from the front forms a main flow in the front-rear direction in this ventilation path, and flows from the main flow as a shunt flowing upward from below the respective batteries adjacent to the front and rear, and is discharged from the upper rear part of the battery frame. ,
Thus, it is possible to supply the cooling air that has not been heat-exchanged to each battery from the front row to the rear row, to uniformly and entirely cool each battery, and to significantly improve the battery cooling effect.

According to the second aspect of the invention, the battery can be positioned in the front-rear direction by the battery mounting shelf of the vehicle width direction frame, and the battery can be positioned at the upper edge of the front-rear frame protruding above the battery mounting shelf. Since positioning in the width direction can be performed, the battery can be securely fixed without shifting the battery back and forth and left and right.

According to the third aspect of the invention, since the batteries are mounted in a rearwardly inclined state, a branch of the cooling air flowing from the ventilation path below the batteries to the rearward and upward direction is blown in a direction substantially perpendicular to each battery. As a result, the cooling air can be distributed entirely on the peripheral side surface of each battery, and the cooling effect can be promoted.

According to the fourth aspect, the cooling air flowing from the front of the battery frame to the ventilation path below the battery can be directed upward by the deflection guide section below each battery and diverted upward. Is blown in a direction substantially perpendicular to each battery, and the cooling effect can be promoted.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a first embodiment of the present invention.

FIG. 2 is a perspective view of the embodiment.

FIG. 3 is a perspective view showing a second embodiment of the present invention.

FIG. 4 is an exemplary perspective view showing an assembled state of the intermediate frame according to the embodiment;

FIG. 5 is a sectional view taken along the line AA in FIG. 3;

FIG. 6 is a schematic sectional view showing a third embodiment of the present invention.

FIG. 7 is a cross-sectional view of the vehicle width direction frame of the embodiment.

FIG. 8 is a schematic sectional view showing a fourth embodiment of the present invention.

FIG. 9 is a cross-sectional view of the vehicle width direction frame of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Battery frame 2 Outer frame 3 Front frame 4 Rear frame 5 Left frame 6 Right frame 7 Bottom plate 8 Intermediate frame 9 Front and rear direction frame 10 Vehicle width direction frame 12 Ventilation path B Battery

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B60K 1/04 B62D 25/20

Claims (3)

(57) [Claims] 1. An outer frame comprising front and rear, left and right frames, and an intermediate frame which partitions the inside of the outer frame into a lattice by a front and rear frame and a vehicle width direction frame. Direction frame, and a battery frame with a bottom so as to mount the battery over the vehicle width direction frame adjacent to the front and rear, respectively,
The vehicle width direction frame of the intermediate frame is assembled on the front-rear direction frame to form a ventilation path for cooling air introduced below the battery from the front of the battery frame and discharged from the rear of the battery frame in the front-rear direction. Width direction
While forming the battery mounting shelf on the lower front and rear edges of the frame,
At the intersection of the front and rear direction frame with the vehicle width direction frame,
Forming a notch deeper than the height of the terry mounting shelf;
A battery frame structure for an electric vehicle, wherein a vehicle width direction frame is fitted to and fixed to the vehicle . 2. An inclined surface for mounting a battery in a rearwardly inclined state is formed in a battery mounting portion of a vehicle width direction frame of an intermediate frame and a battery mounting portion of front and rear frames of an outer frame. battery frame structure for an electric vehicle to claim 1 Symbol placement. 3. The battery for an electric vehicle according to claim 1 , wherein a deflection guide portion for directing the cooling air flowing through the ventilation path upward and diverting the cooling air flowing through the ventilation path is provided at a position below the battery on the bottom plate. Frame structure.