JPH07237457A - Battery cooler for electrically-driven vehicle - Google Patents

Abstract

PURPOSE:To eliminate generating nonuniformity of temperature between batteries by mounting an air dust, for blowing cooling air respectively to a wide area side surface of the six surfaces in each battery, on a lower surface of a battery box. CONSTITUTION:In this battery box 1, having a bottomed box-shaped box main unit 2, inner frame 8 welded to internal surfaces of four side surfaces of this box main unit and a center frame 9 linked to the center, a lower part heat insulating material 11 and center heat insulating material 12 are provided to be laid respectively in an internal bottom of the box main unit 2 and in the center frame 9. In the box main unit 2 thus obtained, a plurality of batteries 14 are received, to close mutually between the batteries 14 by a joint material 15, also further to provide an upper part heat insulating material 16 and a lid 17. A plurality of air ducts 30 are provided in the box main unit 2, and air, generated by a cross flow fan 38 connected to each one end of the air duct 30, is utilized for cooling a side surface of the right/left batteries 14, thereafter to generate almost a horizontal flow discharged via an exhaust passage.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a battery cooling device for an electric vehicle.

[0002]

2. Description of the Related Art A battery mounted on an electric vehicle changes in performance (mileage, life) depending on the battery temperature. It is necessary to use the device within the specified temperature range in order to secure the mileage and prevent the battery life from being shortened. Therefore, the present applicant previously proposed a battery cooling device for an electric vehicle in Japanese Patent Laid-Open No. 5-193376. That is, JP-A-5
As shown in FIG. 11 of Japanese Patent Laid-Open No. 193376, 4 × 5 = 20 batteries are stored in a battery box, and air taken in from the front of the battery box is made to flow backward between the batteries and exhausted by an exhaust fan at the rear. This is to forcibly cool the battery group. A conventional device having the same principle as this device will be described with reference to the drawings.

FIG. 24 is a plan sectional view of a conventional battery box, and FIG. 25 is a side sectional view. Battery box 1
00, three push-in fans 101, ..., Two exhaust fans 102, 102 are attached to the rear surface, and 4 × 5 = 20 batteries 103 are housed in the battery box 100. The cooling air cools the front surface, the left and right side surfaces, and the rear surface of each battery 103 ... As shown by the arrows.
FIG. 26 is a temperature curve diagram of cooling air in a conventional battery box. If the air flow direction is from left to right in the figure, the temperature of the air itself rises due to heat absorption, and the cooling capacity decreases. Therefore, temperature variations occur among the 20 batteries 103.

FIG. 27 is an enlarged plan view of a conventional battery. For example, one battery 103 has six cells 103a.
It consists of ... As described above, the battery 103 is mainly cooled on the four front, rear, left and right sides. Then 6 cells 10
3a ..., the 1st and 6th cells are cooled more strongly than the other 2nd-5th cells. This is because the cooling area is extremely different.

[0005]

As described above, in the conventional fan in which the front, rear, left, and right surfaces of the battery are forcibly cooled, the temperature difference between the plurality of batteries is remarkable, and moreover, in one battery. However, the temperature difference between the cells is significant.
If the temperature unevenness between the batteries is large, there will be a difference in charging efficiency, and overcharged batteries and undercharged batteries will coexist. If charging and discharging are repeated, some batteries (or cells) will be in a short time. Will run out of life. Since the battery is called a battery pack and is replaced as a set, the life of the battery pack may be significantly shorter than the expected time. Therefore, an object of the present invention is to provide a battery cooling device for an electric vehicle that can reduce temperature unevenness between batteries.

[0006]

In order to achieve the above object, the present invention is a battery box for accommodating a large number of box-shaped batteries for driving an electric vehicle. It is characterized in that an air duct for blowing cooling air is attached to each of the side surfaces on the side of the wide area.

A support for supporting at least the lower surface of the battery box is attached to the battery box, and the support has a hollow shape extending in the same direction as the air duct, and the support is a duct for blowing cooling air to each side surface of the battery. . It is preferable to set the lower surface of the support at a position lower than the lower surface of the air duct.

A plurality of air ducts may be arranged in parallel on the lower surface of the battery box and mechanically connected to each other. Each air duct may be integrally formed of a resin material. Each air duct may have a notch that easily deforms itself when subjected to an external force.

[0009]

The air duct blows cooling air through the lower surface of the battery box to each side surface of the battery so that there is no temperature unevenness between the batteries. Further, since the support serves both as the battery box supporting means and the duct means, it is not necessary to dispose a different air duct at the support mounting position. The lower surface of this support is lower than the lower surface of the air duct, and only the lower surface of the support having high rigidity is grounded when the battery box is grounded.

The plurality of air ducts mounted in parallel on the lower surface of the battery box are mechanically coupled to the adjacent air ducts to simplify the mounting on the battery box. Since each air duct is integrally molded of resin material, it is mass-produced in the same shape. When the air duct hits an obstacle on the ground while the vehicle is running, only a part of the air duct is deformed from the notch part and the other part remains, and the air duct partially functions as the air duct.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings. Note that the drawings are to be viewed in the direction of the reference numerals, and hereinafter “front”, “rear”, “left”, and “right” follow the directions viewed from the driver. FIG. 1 is an exploded perspective view of a battery box equipped with the battery cooling device of the present invention.

The battery box 1 includes a box body 2 having a bottomed box shape, an inner frame 8 welded to the inner surfaces of the four side surfaces of the box body 2, a center frame 9 passed to the center, and an inner bottom of the box body 2. A lower heat insulating material 11 spread over the inner frame 8, a central heat insulating material 12 filled in the center frame 9, a side heat insulating material 13 attached to the inner frame 8, a battery 14 described below, and joints for closing an upper gap between them. Material 15 ..., upper heat insulating material 16, and lid 17
Consists of. The box body 2 has supports 20, 20
And a plurality of air ducts 30 are attached to the support 2
A cross flow fan 38 for sending air under pressure is connected to one end of each of 0, 20 and the air duct 30.

On the bottom portion 3 of the box body 2, one of the six sides of the box-shaped battery 14 is located at a position facing the gap between the side surface on the side of a large area (referred to as the long side surface) and the long side surface of the adjacent battery 14. Intake slits 3b ... Are opened, and three vertically elongated elliptical exhaust holes 7b ... Are opened on the side surface of the box body 2 that is farthest from the mounting position of the cross flow fan 38 (see FIG. 2). ).

The air ducts 30 ... Are provided with slits 30a ... Opened on the upper surface so as to face the intake slits 3b of the bottom portion 3. The lower heat insulating material 11 is also provided with a slit 11a corresponding to the air intake slit 3b of the bottom portion 3, and the central heat insulating material 12 is also provided with a slit 12a at a position corresponding to the air intake slit 3b of the bottom portion 3 to form a side heat insulating material. Similarly, the slit 13a is formed in the slit 13.

FIGS. 2 (a) and 2 (b) are processing drawings of the box body of the battery box shown in FIG. 1, and from the box body 2 (bottom 3, front wall 4, rear wall 5, left / right walls 6, 7). Become.)
More specifically, in (a), a convex bead (a groove formed in a thin plate by a die for the purpose of improving strength) 3a ... And an intake slit 3b ... (partly not shown) on the center of the flat plate (front side of the drawing). And the concave portions 4a protruding downward in the front, rear, left and right,
5a, 6a, 7a are formed, three exhaust holes 7b ... Are punched out in the recess 7a, and the hatched portions at the four corners are cut off. Then, as shown in (b), the four sides are bent upward to form the front, rear, left, and right walls 4 to 7, and the walls 4 to 7 are welded to each other, so that a high-grade mold is not required and it is extremely simple. The box body 2 can be manufactured.

FIG. 3 is an overall sectional view of the battery box of FIG. 1, in which a cross flow fan 38 is attached to the left wall 6 and an exhaust hole mechanism 40 (exhaust valves 40a, 40a,
It consists of a hood 40b. ) Is attached and the left and right rows of batteries 14 ... (2 × 12 = 24) are housed in the box 1. The battery box 1 assembled in this manner is bolted to the vehicle body frames 45, 45 via the supports 20, 20. 46 is a cross flow fan fan case fixing bolt, 47 is a breaker box fixing bolt,
Reference numerals 48 and 48 are rocket pins for positioning.

The operation of the battery box for an electric vehicle having the above structure will be described below. In FIG. 3, the battery 1
When it is necessary to cool 4 ..., For example, the crossflow fan 38 is started at the time of charging. Cross flow fan 38
Pressurizes the intake air (cooling air) as shown by the arrow,
Send to the air duct 30. The air duct 30 penetrates the bottom portion 3 of the box body 2 as shown by an arrow to blow air. After cooling the front and rear side surfaces of the left and right batteries 14, 14 respectively, this air becomes a substantially horizontal flow and flows to the right, and reaches the exhaust passage 19, after which the exhaust valves 40a, 40a are pushed open to the outside. Get out. Since the box-shaped battery 14 is thermally insulated on the short side surfaces (side surfaces on the narrow area side of the battery 14) excluding the long side surfaces of the six surfaces and the upper and lower surfaces, there is substantially no transfer of heat to the outside and Cooling is well managed because only the sides are cooled, which results in very small temperature differences between the batteries, which is preferred.

FIG. 4 is a bolt mounting view of the battery box of FIG. 1. In the battery box 1 of the present invention, the fan case fixing bolt 46 is directed outward with respect to the battery 14, that is, the head 46a of the bolt is attached to the box body 2. It is characterized in that the tip of the bolt is projected outward by welding to the left wall 6. In addition, the same applies to the air duct 30 attached to the bottom portion 3 of the box body 2, the breaker box on the lid 17, and the mounting bolts for the hydrogen explosion-proof filter (not shown). With this structure, the battery 14 is not damaged by the tip of the bolt.

FIG. 5 is a schematic diagram of an electric vehicle equipped with the battery box of FIG.
Front and rear wheels FW and rear wheels RW, a vehicle body ram 45 is provided in the lower portion, the battery box 1 is provided in the vehicle body frame 45 (see FIG. 3), and an electric vehicle drive motor M is provided in the rear portion. It is set up. Seats FS and RS are arranged in the front and rear in the passenger compartment.
The battery box 1 is arranged below the.

FIG. 6 is an assembled perspective view of the battery box of FIG. 1, in which a plurality of air ducts 3 are provided on the lower surface of the box body 2.
It is shown that 0 ... Are arranged in parallel. Air duct 30
Is attached to the bottom portion 3 with bolts (not shown) or the like, and the steel plate supports 20 and 20 are attached to the front and rear two positions of the box body 2 by spot welding or the like. Each support 2
0 and 20 are composed of a horizontal support portion 21 attached to the lower surface of the bottom portion 3 of the box body 2 and an upright support portion 22 attached to the left and right walls 6 and 7, which support the battery box 1 and It has increased rigidity.

The horizontal support portion 21 is provided in the air duct 3 described above.
It has a hollow shape extending in the same direction as 0 and also serves as a duct for blowing cooling air to each side surface of the battery 14. Therefore, the horizontal support portion 21 connects the suction port 23 to the cross flow fan 38, and like the air duct 30, the air introduced from the cross flow fan 38 passes through the bottom portion 3 of the box body 2 and is blown up. . Then, since the air can be blown from the entire lower surface of the battery box 1 to the long side surfaces of each battery 14 including the mounting position of the horizontal support portion 21, the cooling effect is improved. Further, the box body 2 is reinforced by the support 20 to have a high rigidity, so that the box body 2 can be prevented from being deformed even when the heavy battery 14 is stored.

FIG. 7 is an assembled side view of the battery box of FIG. 6, in which the lower surfaces of the horizontal support portions 21 and 21 are set at positions lower than the lower surfaces of the air ducts 30 by a dimension H (for example, about 2 mm). . Therefore, when the battery box 1 is grounded, only the lower surface of the horizontal support portion 21 having high rigidity is grounded, so that the air ducts 30 can be prevented from being damaged. Further, since the battery box 1 accommodating the battery 14 has a large weight of about 500 kg, it is lifted and lowered by a lifter when the battery box 1 is mounted on or removed from a vehicle (not shown). Can be supported by a lifter machine.

FIG. 8 is a perspective view of a main part of the support of the battery cooling device of the present invention, showing a specific shape of the horizontal support part 21. The horizontal support portion 21 has a groove shape in a sectional view with an open upper side, and is formed by bending flange portions 24, 24 at both upper ends, and the flange portions 24, 24 are spot welded to the lower surface of the bottom portion 3 of the box body 2. It becomes a hollow shape by being attached with. The flange portions 24, 24
Is attached to the bottom 3 in a leaktight manner. The horizontal support part 21 may close the boundary with the upright support part 22 with a partition plate 25 to prevent air leakage. Reference numeral 26 is a dispersion plate for evenly distributing the air flow.

The horizontal support portion 21 may have the structure of another embodiment shown in FIG. FIG. 9 is a perspective view of a main part of another embodiment of the support of the battery cooling device according to the present invention. The horizontal support part 21 has a box-shaped dispersion plate 27 and a plate-shaped dispersion plate 27 for evenly distributing the air flow. By providing the plates 28, 28, a plurality of air passages are formed. Box-shaped dispersion plate 2
Slits 27a for blowing air are formed on the upper side of 7.

Next, the specific structure of the air duct 30 will be described. 10 is a perspective view of the first embodiment of the air duct of the battery cooling device of the present invention, and FIG. 11 is a sectional perspective view of the air duct of FIG. The air duct 30 is made of a resin material,
It is a rectangular parallelepiped (cylindrical) having a hollow cross section integrally molded by an injection molding method, a blow molding method, or the like. The air duct 30 has one end serving as an intake port 31 connected to the cross flow fan 38 (see FIG. 1). The resin material is preferably a material having excellent impact strength such as polypropylene resin.

A plurality of slits 30a are formed in the upper portion of the air duct 30 in the longitudinal direction so that air can be blown out. Inside the air duct 30, dispersion plates 32 to 34 for uniformly dispersing the flow of air are integrally formed to have a plurality of air passages. This air duct 3
By arranging a large number of 0s on the lower surface of the box body 2, the air flow can be evenly distributed and blown into the box body 2. Further, since the air duct 30 is attached to the bottom portion 3 by screwing or the like, the configuration of the box body 2 can be simplified, and the box body 2 can be retrofitted, and the installation work and the replacement work can be simplified.

The air duct 30 has an inward and downward hook portion 35 formed at one corner of the upper portion thereof, and a hook portion 3 at the other corner thereof.
Locking grooves 36 that elastically engage with the air ducts 5 are formed and extend in the longitudinal direction of the air duct 30. The hook portion 35 and the locking groove 36 are elastically engaged (snap-fitted) as shown in FIG. 12 (side view in a coupled state), so that the air ducts 30 adjacent to each other are mechanically coupled to each other. Since a plurality of air ducts 30 having the same shape, which are combined with one touch as described above, can be attached to the lower surface of the box body 2, the number of attaching screws and the like are reduced, and the attaching workability is good and the cost is low.

The air duct 30 is shown in FIGS.
The configuration of each of the other embodiments shown in FIG. 18 or 19 may be adopted.
The air duct 30 of the first embodiment shown in FIGS. 10 to 12 above.
The same components as those of the above are denoted by the same reference numerals, and the description thereof will be omitted. FIG. 13 is a perspective view of a second embodiment of the air duct of the battery cooling device of the present invention in a connected state.
0 is the first hook portion 52 that is inward and downward in one corner of the upper portion.
Is formed, and an inward and upward second hook portion 53 is formed at the other lower corner. Then, by elastically engaging the hook portions 52, 53 with each other, the air ducts 50,
50 are mechanically coupled to each other. It should be noted that in this embodiment, the air duct 50 is not provided with a dispersion plate inside, and has a single air passage. According to this embodiment, the air duct 30 has a simpler shape than the air duct 30 of the first embodiment shown in FIG.
The molding die can be easily manufactured at low cost.

FIG. 14 is a perspective view of a third embodiment of the air duct of the battery cooling device of the present invention. The air duct 55 is a tapered cylindrical body as shown in the drawing, and each slit 30a ... Is provided in a row on the upper surface. The hooks 56 ... Which are oriented in the same direction are formed in front of and behind the slits 30a.
Around the slits 30a ... And the hook 56, a packing 57 surrounds. The packing 57 is configured by sticking synthetic rubber (for example, EPDM) on the upper surface of the air duct 55, applying a sealing agent, or integrally molding a soft resin seal portion with the air duct 55. At the upper part of the air duct 55, there are a left side flange portion 55a, a right side flange portion 55b and a rear side flange portion 55.
c is integrally formed.

Next, the mounting state of the air duct 55 will be described. 15 is a sectional view taken along line 15-15 of FIG. 14, and the air duct 55 is temporarily fixed by hooking the hook 56 in the slit of the bottom portion 3 of the box body 2, and then the rear side flange portion 55c is fixed to the bolt / nut 58. It is fixed to the bottom 3 with.

FIG. 16 is a sectional view of the air duct of FIG. 14 in a coupled state. Adjacent left and right side flange portions 55a, 55
The left side flange portion 55a for overlapping b
Is set so that the height from the upper surface of the air duct 55 is lower than that of the right flange portion 55b. Each air duct 55
Is the left and right side flange portions 55a, 55b adjacent to each other
Put the bolts on the bottom 3 of the box body 2
It is attached with a nut 58 (the nut is welded to the inner surface of the bottom portion 3). In this state, the packing 57
Is compressed between the bottom portion 3 of the box body 2 and the upper surface of the air duct 55 to prevent air leakage between the bottom portion 3 and each slit 30a.

In the air duct 55 of the embodiment thus mounted, the air that has entered from the suction port 31 passes through the internal air passage as shown by the arrow in FIG. 15, and is blown into the box body 2 from each slit 30a. Be done. According to this embodiment, the hooks 56 are hooked on the slits in the bottom portion 3 of the box body 2 to temporarily fix the air ducts 55, and then the air ducts 55 are fixed to the bottom portion 3 with bolts and nuts 58. The installation workability is good.

The flange portion 55a of the air duct 55
The mounting structure of ~ 55c is not limited to the bolt / nut 58, and for example, as shown in FIG. 17 (enlarged cross-sectional view of another embodiment of the connecting portion), a simple structure for mounting to the bottom portion 3 of the box body 2 with the clip 59. (When the screw 59a is tightened, the clip end 59b on the rear side expands and fits into the hole of the bottom portion 3.).

FIG. 18 is a side view of a fourth embodiment of the air duct of the battery cooling device of the present invention. The vertical direction of the air duct 60 is narrowed down to form a dispersion plate 62 extending in the front and back directions of this figure, and a plurality of air passages are provided. It shows a configuration having. Although the hook portion and the locking groove are not provided in this embodiment, they may be provided if necessary. According to this embodiment, the shape is simpler than that of the air duct 30 of the first embodiment shown in FIG. 10, and the molding die can be manufactured easily and at low cost.

FIG. 19 is a side view of a fifth embodiment of the air duct of the battery cooling device of the present invention, showing a structure having a notch that easily deforms the air duct 70 when it receives an external force. Specifically, the air duct 70 includes side walls 71, 71 on both sides, large arc-shaped corner portions 72, 72 at lower corners of the side walls 71, 71, and a flat bottom wall extending horizontally from the corner portions 72, 72. 73
And a flat upper wall 74 on the upper side. Notches 75 and 76 extending in the front and back directions in this figure are formed on the inner surfaces of the side walls 71 and 71 and the outer surface of the bottom wall 73. On both sides of the air duct 70, flange portions 77 screwed to the bottom portion 3 of the box body 2 are integrally formed. It should be noted that in this embodiment, the air duct 70 is not provided with a dispersion plate inside, and a single air passage is used.

20 (a) to 20 (c) are explanatory views of the operation of the air duct of FIG. The air duct 70 is shown in FIG.
As shown in FIG. 3, the battery box 1 (not shown) is attached in a normal state. After that, as shown in FIG. 20B, when the air duct 70 hits an obstacle 79 on the ground while the vehicle is traveling, the air duct 70 deforms a part of the bottom wall 73 from the notches 75 and 76. . As shown in FIG. 20C, the air duct 70 is in a state in which a part of the bottom wall 73 is deformed even when the air duct 70 comes off the obstacle 79. However, the bottom wall 73
Part of the air duct functions because the rest of the part remains.

According to this embodiment, the width of the bottom wall 73 is long, and both ends of the bottom wall 73 are arcuate corners 72,
Since it is integrated with 72, it has relatively large elasticity, and it is easy to absorb the impact when an external force is applied. Further, when a strong external force is applied, only a part of the bottom wall 73 is deformed from the notches 75 and 76, so that the remaining part can function as an air duct. If the screw of the flange portion 77 is removed, it can be easily replaced with a normal one.

FIG. 21 is an exploded perspective view of another embodiment of the battery box shown in FIG. 1. In the embodiment shown in FIG. 1, air is made to flow in the direction perpendicular to the longitudinal direction of the battery box 1. Is made to flow in the longitudinal direction (front-back direction) of the battery box. Therefore, the battery box 81 is characterized in that the center frame 84 is provided in the box main body 82 in the cross direction to divide the box main body 82 into two chambers, and the cross flow fans 85, 85 are arranged in each chamber. To do.

In addition, 86 is a lower heat insulating material, 87 is a side heat insulating material, 88 is a battery, 89 is a central heat insulating material, 91 is an upper heat insulating material, 92 is a lid, and 93 in the lower part of the figure is an air duct. It is attached to the bottom of the main body 82 by screwing or the like. 94 is a support, and the box body 82
It is attached to the left and right side walls 82a, 82a by spot welding or the like and does not have a horizontal support portion which also serves as a duct as in the embodiment shown in FIG.

FIG. 22 is an enlarged plan view of the air duct of FIG. 21. The air duct 93 is a large, medium and small V-shaped dispersion plate 94.
9 to 96 are attached as shown in the figure, and it is preferable to flow air from the right side of the figure as shown by the arrow, because an equal amount is divided.

FIG. 23 is an operation diagram of the battery box of FIG. 21, in which air from the fan 85 on the left side of the drawing flows as shown by the arrow pointing to the right to cool the long side surfaces of the batteries 88. It is discharged to the outside of the box through a flow path provided between the central heat insulating material 89 and the center frame 84. The same applies to the leftward air flow from the fan 85 on the right side of the figure. This alternative embodiment is suitable for large battery boxes.

Although not shown, the box body 2 has a cross,
A center frame may be provided like a square character. By thus inserting the center frame, the rigidity of the battery box can be increased, and the center frame can be used as an exhaust passage, so that the structural design can be used in various ways.

In each of the above embodiments, the support 2
0 and the air ducts 30, 50, 60, 70, 93 do not limit the presence or the shape or the number of the dispersion plates 26 to 28, 32 to 34, 62, 94 to 96 inside, and other than the V shape, for example, A plurality of straight plate-shaped dispersion plates extending in the air flow direction may be arranged in parallel.

[0044]

Since the present invention is configured as described above, it has the following effects. In the battery cooling device for an electric vehicle according to claim 1, in a battery box that stores a large number of box-shaped batteries for driving the electric vehicle, an air duct is attached to a lower surface of the battery box, and cooling air is blown from below, Since the cooling air is blown to the wide area side surface of the six surfaces of each battery, the temperature unevenness between the batteries can be reduced, the performance of the batteries can be exhibited, and the service life can be extended.

In a battery cooling device for an electric vehicle according to a second aspect of the present invention, a support for supporting at least the lower surface of the battery box is attached to the battery box, and the support is hollow so as to extend in the same direction as the air duct. Since the duct is used to blow the cooling air to the side surface, the support can serve as the battery box supporting means and the duct means, and it is not necessary to provide a different air duct at the support mounting position. Further, as compared with the case where these two means are arranged in an overlapping manner, the height below the battery box can be reduced, and the entire battery box can be lowered to save space. Therefore, the height from the lower surface of the battery box mounted on the vehicle to the ground can be reduced, and the height of the vehicle can also be reduced.

In the battery cooling device for an electric vehicle according to claim 3, since the lower surface of the support is set to a position lower than the lower surface of the air duct, only the lower surface of the support having a high rigidity when the battery box is grounded. Since it is grounded, it is possible to prevent damage to the air duct.

In the battery cooling device for an electric vehicle according to a fourth aspect of the present invention, a plurality of air ducts are arranged side by side on the lower surface of the battery box and mechanically connected to each other, so that a plurality of air ducts are connected to the lower surface of the battery box. Since it can be mounted, it has good workability and requires few mounting screws.

In the battery cooling device for an electric vehicle according to the fifth aspect, since each air duct is integrally formed of a resin material, a large number of air ducts having the same shape to be attached to the battery box can be easily mass-produced and the productivity is good.

In the battery cooling device for an electric vehicle according to a sixth aspect of the present invention, each air duct has a notch that easily deforms the air duct itself when an external force is applied. Even if the air duct hits, only a part of the notch part is deformed and the other part remains, and the air duct can partially function.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a battery box including a battery cooling device of the present invention.

FIG. 2 is a machining diagram of the box body of the battery box shown in FIG.

FIG. 3 is an overall sectional view of the battery box of FIG.

FIG. 4 is a bolt mounting view of the battery box of FIG.

FIG. 5 is a schematic diagram of an electric vehicle equipped with the battery box of FIG.

FIG. 6 is an assembled perspective view of the battery box of FIG.

7 is an assembled side view of the battery box of FIG.

FIG. 8 is a perspective view of a main part of a support of the battery cooling device of the present invention.

FIG. 9 is a perspective view of an essential part of another embodiment of the support of the battery cooling device of the present invention.

FIG. 10 is a perspective view of the first embodiment of the air duct of the battery cooling device of the present invention.

11 is a sectional perspective view of the air duct of FIG.

FIG. 12 is a side view of the air duct in FIG. 10 in a coupled state.

FIG. 13 is a perspective view of the air duct of the battery cooling device of the present invention in a connected state of the second embodiment.

FIG. 14 is a perspective view of a third embodiment of the air duct of the battery cooling device of the present invention.

15 is a sectional view taken along line 15-15 of FIG.

16 is a sectional view of the air duct in FIG. 14 in a coupled state.

FIG. 17 is an enlarged cross-sectional view of another embodiment of the connecting portion of the air duct of FIG.

FIG. 18 is a side view of a fourth embodiment of the air duct of the battery cooling device of the present invention.

FIG. 19 is a side view of a fifth embodiment of the air duct of the battery cooling device of the present invention.

20 is an explanatory view of the action of the air duct of FIG.

FIG. 21 is an exploded perspective view of another embodiment of the battery box shown in FIG.

22 is an enlarged plan view of the air duct in FIG. 21.

FIG. 23 is an operation diagram of the battery box of FIG. 21.

FIG. 24 is a plan sectional view of a conventional battery box.

FIG. 25 is a side sectional view of a conventional battery box.

FIG. 26 is a temperature curve diagram of cooling air in a conventional battery box.

FIG. 27 is an enlarged plan view of a conventional battery.

[Explanation of symbols]

1 ... Battery box, 2 ... Box body, 3 ... Bottom part,
14 ... Battery, 20 ... Support, 21 ... Horizontal support part, 22 ... Upright support part, 23 ... Suction port, 30 ... Air duct, 31 ... Suction port, 35 ... Hook part, 36 ... Locking groove, 3
8 ... Cross flow fan, 44 ... Electric vehicle, 50 ... Air duct, 52, 53 ... Hook part, 55, 60, 70 ... Air duct, 75, 76 ... Notch.

Claims (6)

[Claims] 1. A battery box for accommodating a large number of box-shaped batteries for driving an electric vehicle, wherein cooling air is provided on the lower surface of the battery box to the side surface on the wide area side of the six surfaces of each battery. A battery cooling device for an electric vehicle, characterized in that an air duct for blowing is attached. 2. A support for supporting at least the lower surface of the battery box is attached to the battery box, the support is hollow so as to extend in the same direction as the air duct, and the support blows cooling air to each side surface of the battery. The battery cooling device for an electric vehicle according to claim 1, wherein the battery cooling device is a duct for. 3. The battery cooling device for an electric vehicle according to claim 2, wherein a lower surface of the support is set at a position lower than a lower surface of the air duct. 4. The battery cooling device for an electric vehicle according to claim 1, wherein a plurality of the air ducts are arranged in parallel on a lower surface of the battery box and are mechanically coupled to each other. 5. The battery cooling device for an electric vehicle according to claim 4, wherein each of the air ducts is integrally formed of a resin material. 6. The battery cooling device for an electric vehicle according to claim 5, wherein each of the air ducts has a notch that easily deforms the air duct itself when receiving an external force.