JP2009119936A - Battery cooling device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a battery cooling device for a vehicle capable of cooling the battery efficiently. <P>SOLUTION: The battery cooling device 1 for the vehicle includes: a battery case 20 for housing a plurality of batteries 101 to be mounted on the vehicle; a fan 41 for circulating air for cooling the batteries 101 by suctioning air inside the battery case 20; air inlets 24a disposed on each of a pair of side wall portions 24 facing each other for introducing air from outside to the inside of the battery case 20; and air outlets 23a, 23b disposed on a bottom wall portion of the battery case 20 for exhausting air from the battery case 20 by suctioning of the fan 41. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a vehicle battery cooling device.

Fuel cell vehicles and hybrid vehicles are equipped with a high voltage battery device that discharges charging power to assist the fuel cell during acceleration or the like, or charges regenerative power during regeneration. A high voltage battery device houses a plurality of batteries made of secondary batteries such as lithium ions in a battery case and is mounted on a vehicle such as a fuel cell vehicle.
When a plurality of batteries are charged and discharged, the temperature rises, and in order to prevent battery performance deterioration due to such temperature rise, a vehicle battery cooling device that cools the batteries by circulating air using a fan Has been proposed (see Patent Document 1).

Japanese Patent No. 3640846

In such a vehicle battery cooling device, it is desired to develop a technique for cooling the battery more efficiently.
Then, this invention makes it a subject to provide the battery cooling device for vehicles which can cool a battery efficiently.

  As means for solving the above problems, the present invention provides a battery case that houses a plurality of batteries mounted on a vehicle, a fan that sucks air in the battery case and distributes air that cools the battery. The pair of side wall portions of the battery case that are opposed to each other are formed with air inlets for air introduced into the battery case from the outside, respectively, and the bottom of the battery case An air discharge port for air discharged from the inside of the battery case by being sucked by the fan is formed in the wall portion.

  According to such a vehicle battery cooling device, when the fan operates, the air in the battery case is sucked into the fan through the air discharge port formed in the bottom wall portion, so that the outside of the battery case. Discharged. As a result, the air outside the battery case is introduced into the battery case via the air inlets formed in the pair of opposite side walls of the battery case, and then circulates in the battery case to Cooling.

As described above, since the fan is arranged downstream of the air discharge port of the battery case, the fan is arranged upstream of the battery case, and the air heated by receiving and operating the fan is introduced into the battery case. For a given configuration, the battery can be cooled efficiently.
Moreover, since the air into the battery case is introduced into the battery case via the air inlet port facing the battery case, a plurality of batteries stored in the battery case can be efficiently cooled.
Furthermore, even if the vehicle battery cooling device is submerged and water enters the battery case and the space, the water can be quickly discharged by operating the fan in the normal rotation.

  In addition, an air intake duct may be provided after external air is taken in from one air intake port and then branched and led to the air introduction port, and the one air intake port is disposed away from an external heat source. It is a battery cooling device for vehicles.

  According to such a vehicle battery cooling device, external air can be taken in from one intake port and then branched and guided to the air introduction port by the intake duct. And since one inlet of a duct is arrange | positioned away from an external heat source, the air introduce | transduced in a battery case becomes difficult to be heated by an external heat source. Thereby, a some battery can be cooled efficiently.

  Further, two first frames extending in the vehicle front-rear direction, at least two second frames extending in the vehicle width direction of the vehicle and connected to the two first frames, the two first frames, and the at least two A lower plate that seals the lower part of the space surrounded by the second frame, and the battery case is disposed above the space, and when the fan is activated, the air in the battery case is A suction hole is sucked by the fan through the space and the space, and a communication hole is formed in the lower plate for communicating the space and the outside. The vehicle battery cooling device is disposed on the opposite side of the fan across the outlet.

According to such a vehicle battery cooling device, when the fan is operated, the air in the battery case is discharged from the air discharge port formed in the bottom wall portion of the battery case, the two first frames, and the at least two second frames. The air is sucked into the fan through the spaces surrounded by.
That is, in the lower part of the battery case, a space formed by being surrounded by the two first frames and at least two second frames and sealed by the lower plate is used as a discharge passage for the air discharged from the battery case. Can be used as That is, it is not necessary to attach a duct constituting an air discharge channel to the air discharge port of the battery case. Thereby, while reducing the number of parts of the vehicle battery cooling device, the configuration of the vehicle battery cooling device can be simplified and reduced in weight.

  In addition, since the lower plate is formed with a communication hole for communicating the space and the outside (outside the vehicle), for example, even if condensed water is generated in the battery case or in the space, the condensed water is It can be discharged to the outside through the communication hole.

  The communication hole is arranged on the opposite side of the fan across the air discharge port of the battery case in the vehicle width direction, so that when the fan is activated, external air passes through the communication hole. The amount sucked in is reduced. That is, the suction loss when the fan is operated to suck the air in the battery case can be reduced.

  ADVANTAGE OF THE INVENTION According to this invention, the battery cooling device for vehicles which can cool a battery efficiently can be provided.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
The vehicle battery cooling device 1 according to the present embodiment is mounted on a fuel cell vehicle (vehicle) (not shown) and is disposed under the rear seat. Prior to the vehicle battery cooling device 1, a plurality of batteries 101 to be cooled will be described.

≪Multiple batteries≫
The plurality of batteries 101 are secondary batteries that discharge charging power to assist a fuel cell stack (not shown) mounted on a fuel cell vehicle or charge regenerative power from a travel motor or the like. Such a battery 101 is composed of, for example, a lithium ion type secondary battery, and its outer shape has a cylindrical shape, and its longitudinal direction (axial direction) is arranged along the front-rear direction of the fuel cell vehicle, not shown. The terminals are electrically connected in series via the terminals. The number of the batteries 101 is determined based on, for example, the rated output of an electric travel motor (not shown) mounted on the fuel cell vehicle.

  The plurality of batteries 101 correspond to four in-case flow paths P1 to P4 (see FIGS. 8 and 9) in the battery case 20 to be described later, the first battery group 111, the second battery group 112, The third battery group 113 and the fourth battery group 114 are divided.

The in-case flow paths P1 to P4 are flow paths through which air for cooling the plurality of batteries 101 flows in the battery case 20, and the air flow paths in the battery case 20 are formed by the holding panel 21 described later. It is formed by being divided into four formally.
In the battery case 20, the first battery group 111 and the in-case flow path P1 are front right, the second battery group 112 and the in-case flow path P2 are front left, and the third battery group 113 and the in-case flow path P3 are On the right rear, the fourth battery group 114 and the in-case flow path P4 are arranged on the left rear, respectively (see FIGS. 8 and 9).

The first battery group 111, the second battery group 112, the third battery group 113, and the fourth battery group 114 are each composed of 20 batteries 101. Each of the battery groups 111 to 114 includes a lower battery layer formed from seven batteries 101, a middle battery layer formed from six batteries 101, and an upper battery layer formed from seven batteries 101. (See FIG. 11 and FIG. 12). Moreover, in each battery group 111-114, the battery 101 is laminated | stacked so that the battery 101 may become a zigzag form, spacing predetermined intervals by hold | maintaining the battery 101 with the holding panel 21. FIG.
That is, the batteries 101 constituting each of the battery groups 111 to 114 have the same number and the same arrangement.

  The first battery group 111 and the second battery group 112, the third battery group 113 and the fourth battery group 114 are symmetrical on both sides of the center line A2 of the battery case 20 (both sides of the column member 27) described later. Has been placed.

≪Configuration of vehicle battery cooling system≫
As shown in FIGS. 1 to 3, the vehicle battery cooling device 1 includes two front and rear frames 11 (first frame) and two cross members 12 (second frame), a battery case 20, and a fan 41. And an intake duct 50, a temperature sensor 61 (see FIG. 16), and an ECU 70 (Electronic Control Unit, electronic control device, see FIG. 16).

<Front and rear frames, cross members>
The two front and rear frames 11 and the two cross members 12 are members constituting a part of the body frame of the fuel cell vehicle. The two front and rear frames 11 extend in the front-rear direction of the fuel cell vehicle and are disposed on both outer sides in the vehicle width direction (see FIG. 2). The two cross members 12 extend in the vehicle width direction of the fuel cell vehicle and are arranged at a predetermined interval, and both ends thereof are respectively connected to the two front and rear frames 11 and 11 (see FIG. 3).

The height dimension of each front / rear frame 11 and the height dimension of each cross member 12 are designed to be substantially equal (see FIG. 10). A space S surrounded by the two front and rear frames 11, 11 and the two cross members 12, 12 is formed. The space S is a flow path for air discharged from the battery case 20. It is functioning (see FIGS. 11 and 12).
In addition, an intermediate member 13 is provided so as to connect the front and rear frames 11 and 11 at an intermediate position between the opposing cross members 12 and 12 (see FIGS. 3 and 9).

<Lower plate>
The lower plate 15 is a plate-like component, is attached to the lower surfaces of the two front and rear frames 11 and the two cross members 12, and seals the lower part of the space S (see FIGS. 10 to 12). ).
The lower plate 15 is formed with two communication holes 15a that allow communication between the space S and the outside of the vehicle (outside) (see FIGS. 11 and 12). As a result, even if moisture such as condensed water is generated in the space S, the condensed water or the like is discharged out of the vehicle through the communication hole 15a.

The communication holes 15a and 15a are arranged on the right side in the vehicle width direction. That is, the communication holes 15a and 15a are disposed on the opposite side of the fan 41 disposed on the right side with the air discharge ports 23a and 23b through which the air in the battery case 20 is discharged (FIGS. 11 and 12). reference). In other words, the air exhaust port 23a (23b) and the communication hole 15a are arranged away from the fan 41 in this order. The air discharge ports 23a and 23b are formed at substantially the center of the battery case 20 in the vehicle width direction.
Thereby, even if the fan 41 is operated, air outside the vehicle is hardly sucked into the space S through the communication holes 15a and 15b, and the cooling efficiency of the battery 101 is not lowered.

<Battery case>
The battery case 20 is a container for storing a plurality of batteries 101 for protection from water, dust, and the like. Such a battery case 20 includes six holding panels 21, two upper panels 22, four bottom panels 23, two side panels 24, three support members 27, two And a first dummy member 28 (see FIGS. 1 and 3).

The battery case 20 is disposed above the space S surrounded by the front and rear frames 11 and 11 and the cross members 12 and 12, and is shifted to the right side, that is, the right front and rear frame 11 side (FIG. 11, FIG. 12). That is, the center line A2 of the battery case 20 in the vehicle width direction is shifted to the right from the center line A1 of the fuel cell vehicle passing between the two front and rear frames 11 and 11.
A space is formed on the left side of the battery case 20 and substantially above the space S protruding from the battery case 20 in plan view, and the fan 41 is disposed in this space (see FIGS. 11 and 11). 12). Thereby, space saving of the vehicle battery cooling device 1 is achieved.

[Prop member]
The three support members 27 are on the center line A2 (see FIG. 8) of the battery case 20 and on the upper surfaces of the cross members 12, 12 and the intermediate member 13 in the vicinity of air discharge ports 23a, 23b described later. Each is erected (see FIGS. 2 and 9). And the upper end of each support | pillar member 27 is each fixed to the upper panel 22 via the L-shaped bracket (not shown) etc. (refer FIG. 11, FIG. 12).

  Here, in the present embodiment, the bottom wall portion of the battery case 20 includes the two cross members 12 and the intermediate member 13 and the four bottom panels 23. The upper wall portion of the battery case 20 includes two upper panels 22. The three support members 27 connect the upper wall portion and the bottom wall portion of the battery case 20, and hold the battery case 20 at a predetermined distance between the upper wall portion and the bottom wall portion. The rigidity of 20 is increased.

[Holding panel]
The six holding panels 21 are arranged symmetrically on both sides of the three column members 27 in the vehicle width direction. Each holding panel 21 is formed with seven through holes 21a in the upper stage, six in the middle stage, and seven in the lower stage, and a total of 20 through holes 21a are arranged in a staggered manner in the height direction. . And the battery 101 is each inserted in each through-hole 21a.
As a result, the plurality of batteries 101 are stored in the battery case 20 in a staggered manner with a predetermined interval therebetween.

In addition, the air flow paths in the battery case 20 are divided into front case flow paths P1 and P2 and rear case flow paths P3 and P4 by the holding panels 21 and 21 arranged in the middle in the front-rear direction. It is partitioned.
Further, a front cover 31 is attached to the frontmost holding panel 21 (see FIGS. 3 and 8). On the other hand, a rear cover 32 is attached to the rearmost holding panel 21.

[Bottom panel]
The four bottom panels 23 are components constituting the bottom wall portion of the battery case 20, and are attached to the front and rear frames 11, the cross member 12, and the intermediate member 13 (see FIGS. 2 and 9). The two bottom panels 23 and 23 arranged in the vehicle width direction are separated from each other by a predetermined interval, and the space between the two bottom panels 23 and 23 is an air exhaust port 23a or an air exhaust port 23b. That is, a front air discharge port 23a and a rear air discharge port 23b are formed in the bottom wall portion of the battery case 20 including four bottom panels 23 and the like (see FIG. 9).
In addition, you may comprise the bottom wall part of the battery case 20 with one bottom panel.

  The space S below the battery case 20 communicates with the two front case flow paths P1 and P2 in the battery case 20 via the front air outlet 23a (see FIG. 11). Moreover, it communicates with the rear case flow paths P3 and P4 in the battery case 20 through the rear air discharge port 23b (see FIG. 12).

Further, the rear air outlet 23b is designed to be larger than the front air outlet 23a (see FIG. 9).
Thereby, the resistance of the flow path through which the air discharged from the front case flow paths P1, P2 flows is larger than the resistance of the flow path through which the air discharged from the rear case flow paths P3, P4 flows. It has become. That is, the pressure loss received by the air discharged from the front case flow paths P1, P2 is larger than the pressure loss received by the air discharged from the rear case flow paths P3, P4.
Therefore, the battery 101 arranged in the two front case flow paths P1, P2 is less likely to be cooled than the battery 101 arranged in the two rear case flow paths P3, P4. It is comprised so that it may become.

[Bottom panel-2nd dummy]
Each bottom panel 23 is formed with a plurality of semi-cylindrical second dummy portions 23c that rise upward (see FIGS. 11 and 12). The second dummy portion 23c is a portion for forming a situation where the batteries 101 are virtually arranged below each of the battery groups 111 to 114, and the radius of the semi-columnar second dummy portion 23c is: It is formed so as to be substantially equal to the radius of the cylindrical battery 101.

And the 2nd dummy part 23c is arrange | positioned corresponding to between the adjacent batteries 101 and 101 in the lower stage of each battery group 111-114 in the vehicle width direction. Further, the distance between the second dummy portion 23 c and the battery 101 is designed to be equal to the distance between the adjacent batteries 101.
Thereby, the air which flows in the battery case 20 and the vicinity of the bottom panel 23 flows along the outer peripheral surface of the lower battery 101, and this battery 101 is cooled suitably (refer FIG. 14). .

[Side panel]
The side panels 24 and 24 are components that face each other in the vehicle width direction and form a pair of side wall portions of the battery case 20 (see FIGS. 8 and 9). Four air inlets 24 a are formed in each side panel 24 (see FIG. 10), two air inlets 24 a are on the front side of the side panel 24, and the other two air inlets 24 a are on the side panel 24. Located on the back side.

On the front side of the battery case 20, air is introduced into the two front case flow paths P <b> 1 and P <b> 2 from the two air introduction ports 24 a disposed on the front side of the pair of side panels 24. (See FIG. 9).
On the other hand, on the rear side of the battery case 20, air is introduced from the four air introduction ports 24 a disposed on the rear side of the pair of side panels 24 into the two rear case flow paths P <b> 3 and P <b> 4. It has come to be.

Further, the air inlet 24a is disposed in the height direction so as to correspond to the lower battery 101 and the upper battery 101 that protrude toward the side panel 24 of each of the battery groups 111 to 114 (FIG. 11, FIG. 12). The air from the air inlet 24a is introduced toward the center of the battery 101 protruding at the lower stage and the battery 101 protruding at the upper stage.
Thereby, air flows along the outer peripheral surface of the battery 101 projecting at the lower stage or the upper stage, and the projecting battery 101 is also suitably cooled (see FIG. 13).

[Upper panel]
The two upper panels 22 are components that constitute the upper wall portion of the battery case 20, and are attached to the support member 27, the holding panel 21, and the side panel 24, and the flow paths P1 to P4 in the case. The top is blocked. An upper cover (not shown) is attached to the upper surfaces of the two upper panels 22.
In addition, you may comprise the upper wall part of the battery case 20 by one upper panel.

[Upper panel-2nd dummy]
Each upper panel 22 is formed with a plurality of semi-cylindrical second dummy portions 22c bulging downward (see FIGS. 11 and 12). The second dummy portion 22c is a portion for forming a situation where the batteries 101 are virtually arranged above each of the battery groups 111 to 114, and the radius of the semi-cylindrical second dummy portion 22c is: It is formed so as to be substantially equal to the radius of the cylindrical battery 101.

And the 2nd dummy part 22c is arrange | positioned corresponding to between the adjacent batteries 101 and 101 of the upper stage of each battery group 111-114 arrange | positioned in the vehicle width direction in the vicinity of the upper panel 22. FIG. Further, the distance between the second dummy portion 23 c and the battery 101 is designed to be equal to the distance between the adjacent batteries 101.
Thereby, the air which flows in the battery case 20 and the vicinity of the upper panel 22 flows along the outer peripheral surface of the battery 101 of the upper stage, and cools this battery 101 suitably.

[First dummy member]
As shown in FIG. 5, the two first dummy members 28 are virtually arranged with the batteries 101 on the support member 27 side (air discharge ports 23 a and 23 b side) of each of the battery groups 111 to 114. The cross section has a semicircular arc shape and the outer shape has a semicylindrical shape. The two first dummy members 28 are attached to both sides of the column member 27, respectively.
The gap between the first dummy members 28 and 28 is closed by four elongated pieces 29 (see FIGS. 5 and 15).

The first dummy member 28 is arranged in the height direction so as to correspond to the recessed portion of the middle stage on the column member 27 side (air discharge port 23a, 23b side) of each battery group 111-114 (FIG. 11). FIG. 12).
Thereby, air is prevented from preferentially flowing into the elongated space formed in the recessed portion, and the air is rectified. Therefore, air flows along the outer peripheral surface of the battery 101 on the lower and upper column members 27 side, and the battery 101 is also efficiently cooled (see FIG. 15).

<Fan, exhaust duct>
The fan 41 is a device that sucks air in the space S and the battery case 20 in order to generate an air flow for cooling the battery 101, and is arranged downstream of the battery case 20 in the present embodiment. . The fan 41 is attached to the left and right front and rear frames 11 in the vehicle width direction, substantially above the space S protruding from the battery case 20 (see FIG. 8).

  Further, the two openings of the space S formed when the battery case 20 is shifted to the right side and the intake port of the fan 41 are connected by the first exhaust duct 42 (FIGS. 8, 11, and 12). reference). A second exhaust duct 43 is connected to the air discharge port of the fan 41.

  When the fan 41 operates, the air in the space S and the air in the flow paths P1 to P4 in each case are sucked through the first exhaust duct 42. As a result, external air is introduced into the in-case flow paths P1 to P4 from both sides of the battery case 20 in the vehicle width direction via the intake duct 50. Thereby, in the battery case 20, many batteries 101 can be arranged in the vehicle width direction, and the height dimension can be reduced.

<Intake duct>
The intake duct 50 is a duct for guiding outside air to the four in-case flow paths P1 to P4. As shown in FIG. 6, the intake portion 51 having an intake port 51a at the upstream end, A right branch portion 52 and a left branch portion 53 that are bifurcated downstream. The right branch portion 52 is disposed on the right side, and its downstream end is connected to four air inlets 24 a formed in the right side panel 24. The left branch 53 is arranged on the left side, and its downstream end is connected to four air inlets 24a formed in the left side panel 24 (see FIG. 8).

  The intake port 51a is arranged to take in air from, for example, the trunk so as to be away from an external heat source (such as a brake disk). As a result, air that has not been warmed by the external heat source can be introduced into the battery case 20, and the battery 101 can be efficiently cooled.

Moreover, the left branch part 53 is configured to be longer than the right branch part 52 (see FIG. 8).
As a result, the resistance of the flow path (left branch part 53) through which the air flowing toward the two left case flow paths P2, P4 flows is the flow of the air flowing toward the two right case flow paths P1, P3. It is larger than the resistance of the road (right branch portion 52). That is, the pressure loss received by the air toward the two left in-case flow paths P2 and P4 is greater than the pressure loss received by the air toward the two right case flow paths P1 and P3.

  Therefore, air is less likely to flow into the two left in-case flow paths P2 and P4 than the two right in-case flow paths P1 and P2. As a result, the battery 101 disposed in the two left case flow paths P2, P4 is less likely to be cooled than the battery 101 disposed in the two right case flow paths P1, P3, resulting in a higher temperature. It has become easier.

Further, the right branch portion 52 and the left branch portion 53 are configured such that the front air introduction ports 24a and 24a are further away from the intake port 51a than the rear air introduction ports 24a and 24a (see FIG. 9).
Thus, air is less likely to flow into the two front case flow paths P1 and P2 than the two rear case flow paths P3 and P4. Therefore, the battery 101 disposed in the two front case flow paths P1 and P2 is less likely to be cooled than the battery 101 disposed in the two rear case flow paths P3 and P4 and becomes high temperature. It has become easier.

<Battery temperature distribution>
In summary, on the upstream side of the battery case 20, air from outside (1) flows most easily into the right rear case flow path P 3, and (2) the right front case flow path P 1, left rear It is configured such that it becomes difficult to flow in the order of the flow path P4 in the case side and the flow path P2 in the case 3 on the left front side.
On the other hand, on the downstream side of the battery case 20, the air in the front case flow paths P1, P2 is less likely to be discharged than the air in the rear case flow paths P3, P4.

  Therefore, the flow rate of air in the battery case 20 is (1) the largest flow path P3 on the right rear side, (2) the flow path P1 on the right front side, the flow path P4 on the left rear side, (3) It becomes the structure which becomes small in order of the flow path P2 in the case on the left front side.

  As a result, the battery 101 arranged in the in-case flow path P2 on the left front side is less likely to be cooled than the batteries 101 arranged in the other in-case flow paths P1, P3, and P4, and is likely to be hot. Yes. In more detail, among the plurality of batteries 101 arranged in the in-case flow path P2 on the left front side, in the vicinity of the battery 101 near the downstream air discharge port 23b, there is a battery 101 arranged upstream thereof. Since the heated air flows, the temperature tends to be higher than those of the other batteries 101.

<Temperature sensor>
The temperature sensor 61 is a sensor that detects the temperature of the battery 101. In the present embodiment, the battery 101 arranged in the left front case flow path P2 is close to the air outlet 23b as described above, It is attached to the battery 101 that tends to become the highest temperature (see FIG. 16). The temperature sensor 61 outputs the temperature of the battery 101 that is likely to be the highest temperature to the ECU 70.

<ECU>
The ECU 70 (control means) is a unit that electronically controls the vehicle battery cooling device, and includes a CPU, a ROM, a RAM, various interfaces, an electronic circuit, and the like. The ECU 70 controls the ON / OFF of the fan 41, the rotation speed, and the like based on the temperature of the battery 101 detected through the temperature sensor 61.

Specifically, for example, the ECU 70 has a first predetermined temperature for turning on the fan 41 and a second predetermined temperature for turning off the fan 41 that is lower by about 2 to 5 ° C. than the first predetermined temperature. It is remembered. Then, the ECU 70 controls ON / OFF of the fan 41 based on the current temperature of the battery 101, the first predetermined temperature, and the second predetermined temperature.
Further, in a state where the fan 41 is to be turned on, the rotation speed of the fan 41 is increased and the air flow rate is increased as the current temperature of the battery 101 is higher.

≪Function and effect of battery cooling system for vehicles≫
According to such a vehicle battery cooling device 1, the following operational effects are obtained.
When the fan 41 operates, the air in the battery case 20 is sucked into the fan 41 through the air discharge ports 23a and 23b and the space S in this order (see FIGS. 11 and 12). That is, a space S formed by being surrounded by the two front and rear frames 11 and the two cross members 12 below the battery case 20 and sealed by the lower plate 15 is used as an air discharge passage. be able to. Thereby, it is not necessary to provide a duct constituting the discharge flow path, and the number of parts of the vehicle battery cooling device 1 can be reduced, and the configuration can be simplified and reduced in weight.

  Further, the battery case 20 is disposed above the space S and shifted to the right front and rear frame 11 side, and the fan 41 is disposed substantially above the portion of the space S that protrudes from the battery case 20. Therefore, in the external shape of the battery cooling device 1 for vehicles, the part which protrudes greatly is not formed, but can be put together compactly.

Furthermore, even if condensed water or the like is generated in the battery case 20 or in the space S, the condensed water or the like can be discharged out of the vehicle through the communication hole 15a of the lower plate 15.
Furthermore, since the communication hole 15a is disposed on the opposite side of the fan 41 with the air discharge ports 23a and 23b interposed therebetween, air outside the vehicle is sucked through the communication hole 15a even if the fan 41 is operated. Can be reduced. Thereby, the suction loss of the fan 41 can be reduced.

  Further, when the fan 41 is operated, the air in the battery case 20 is sucked and discharged by the fan 41 through the air discharge ports 23a and 23b formed in the bottom wall portion. The external air is introduced into the battery case 20 via the air intake duct 50 and the air inlets 24 a formed in the pair of side panels 24 facing each other, and then cools the battery 101.

In other words, since the fan 41 is arranged downstream of the air discharge ports 23a and 23b of the battery case 20, the air heated by the fan 41 is not introduced into the battery case 20, and the battery 101 is It can be cooled efficiently. And since air is introduce | transduced in the battery case 20 via the air inlets 24a and 24a which oppose, the some battery 101 can be cooled efficiently.
Furthermore, even if the vehicle battery cooling device 1 is submerged and water enters the battery case 20 and the space S, the water can be quickly discharged by operating the fan 41 in the normal rotation.

  Furthermore, since the air inlet 51a of the air intake duct 50 is arranged away from the external heat source, the air to the battery case 20 is not warmed by the external heat source, and as a result, the battery 101 is efficiently cooled. can do.

In addition, since the first dummy members 28 and 28 are provided on both sides of the column member 27 corresponding to the recessed portions of the battery groups 111 to 114, on the air discharge side of the battery groups 111 to 114, Air flows along the outer peripheral surface of each battery 101 (see FIG. 15). And the pressure loss which air receives between the upstream-downstream-discharge port of each flow path P1-P4 in each case can be closely approached.
Thereby, the battery 101 arrange | positioned at the air discharge port 23a, 23b side of each battery group 111-114 can also be cooled efficiently. And the some battery 101 can be cooled equally and the dispersion | variation in deterioration between the some batteries 101 can be suppressed.

  Further, the air introduction port 24a of the side panel 24 is formed corresponding to the battery 101 projecting toward the air introduction port 24a, and air from the air introduction port 24a is introduced toward the center of the projecting battery 101, Since it flows along the outer peripheral surface, the projecting battery 101 can also be efficiently cooled (see FIG. 13).

  Furthermore, since a plurality of second dummy portions 23c are formed on the inner surface of the bottom panel 23, air flows along the outer peripheral surface of the lower battery 101 and can be efficiently cooled (see FIG. 14). ). Similarly, since the plurality of second dummy portions 22c are formed on the inner surface of the upper panel 22, the upper battery 101 can also be efficiently cooled.

In addition, since the temperature of the battery 101 constituting the second battery group 112 on the left front side is configured to be the highest, the number of temperature sensors 61 that detect the temperature of the battery 101 can be reduced.
Then, the ECU 70 controls the fan 41 based only on the temperature of the battery 101 detected by the temperature sensor 61, whereby the plurality of batteries 101 can be suitably cooled and deterioration can be prevented.

As mentioned above, although one Embodiment of this invention was described, it is not limited to this, For example, it can change as follows in the range which does not deviate from the meaning of this invention.
In the above-described embodiment, the air in the battery case 20 is sucked by the fan 41 through the space S. However, for example, the fan 41 is directly attached to the air discharge ports 23a and 23b of the battery case 20. It is good also as a structure to attract.

In the above-described embodiment, the lengths of the right branch portion 52 and the left branch portion 53 of the intake duct 50 are different, and the flow rate of air introduced into the left case flow paths P2 and P4 is reduced. The left branch 53 may be partially squeezed, or the left air inlet 24a may be reduced.
In addition, the shape (length, etc.) of the intake duct 50 and the size of the air inlet 24a are designed so that air is introduced into the in-case flow paths P1 to P4 at the same flow rate before and after the battery case 20. May be.

  In addition to the configuration of the above-described embodiment, for example, a semi-cylindrical third dummy portion may be provided on the inner surface of the side panel 24 corresponding to the depression on the side panel 24 side in the middle stage of each of the battery groups 111 to 114. Good.

  In the above-described embodiment, the configuration in which the fan 41 is disposed downstream of the battery case 20 is exemplified. However, for example, the fan 41 is disposed upstream of the battery case 20 and the air discharged from the fan 41 is the battery case. The structure introduced in 20 may be sufficient.

It is a perspective view of the battery cooling device for vehicles concerning this embodiment. It is a partial exploded perspective view of the battery cooling device for vehicles concerning this embodiment. It is a disassembled perspective view of the battery cooling device for vehicles which concerns on this embodiment. It is a perspective view of a plurality of batteries concerning this embodiment. It is a perspective view of the support | pillar member and 1st dummy member which concern on this embodiment. It is a perspective view of the air intake duct concerning this embodiment. It is a perspective view of the fan and exhaust duct concerning this embodiment. It is a top view of the battery cooling device for vehicles concerning this embodiment, and shows the state where the upper panel was removed. It is a plane sectional view of the battery cooling device for vehicles concerning this embodiment, and shows the state where an upper panel and a battery were removed. It is a left view of the vehicle battery cooling device which concerns on this embodiment, and shows the state which removed the fan and the intake duct. It is the sectional view on the AA line of FIG. It is the BB sectional drawing of FIG. It is sectional drawing of the principal part of the battery cooling device for vehicles which concerns on this embodiment. It is sectional drawing of the principal part of the battery cooling device for vehicles which concerns on this embodiment. It is sectional drawing of the principal part of the battery cooling device for vehicles which concerns on this embodiment. It is a figure which shows typically the structure of the battery cooling device for vehicles which concerns on this embodiment.

Explanation of symbols

1 Battery cooling device for vehicle 11 Front and rear frames (first frame)
12 Cross member (second frame)
15 Lower plate 15a Communication hole 20 Battery case 22 Upper panel (upper wall)
22c 2nd dummy part 23 Bottom panel (bottom wall part)
23a, 23b Air outlet 23c Second dummy part 24 Side panel (side wall part)
24a air introduction port 27 support member 28 first dummy member 41 fan 50 intake duct 51a intake port 61 temperature sensor (temperature detection means)
70 ECU (control means)
DESCRIPTION OF SYMBOLS 101 Battery 111 1st battery group 112 2nd battery group 113 3rd battery group 114 4th battery group A1 Centerline of fuel cell vehicle A2 Centerline of battery case P1 to P4 Flow path in case S Space

Claims (3)

A battery case for storing a plurality of batteries mounted on the vehicle;
A fan for sucking air in the battery case and circulating air for cooling the battery;
A battery cooling device comprising:
Air inlets for air introduced into the battery case from the outside are formed in the pair of side wall portions facing the battery case, respectively.
An air discharge port for air discharged from the inside of the battery case by being sucked by the fan is formed in the bottom wall portion of the battery case. After intake air from one intake port, it is provided with an intake duct that branches and leads to the air introduction port,
The vehicle battery cooling device according to claim 1, wherein the one intake port is disposed away from an external heat source. Two first frames extending in the longitudinal direction of the vehicle;
At least two second frames extending in a vehicle width direction of the vehicle and connected to the two first frames;
A lower plate that seals down a space surrounded by the two first frames and the at least two second frames;
With
The battery case is disposed above the space,
When the fan operates, the air in the battery case is sucked into the fan through the air outlet and the space in order,
The lower plate is formed with a communication hole for communicating the space and the outside,
The vehicle battery cooling device according to claim 1, wherein the communication hole is disposed on the opposite side of the fan across the air discharge port in the vehicle width direction.

Images