WO2016030931A1

WO2016030931A1 - Battery cooling device

Info

Publication number: WO2016030931A1
Application number: PCT/JP2014/004445
Authority: WO
Inventors: 井口　豊樹; 加藤　浩二; 弘明斉藤; 清田　茂之
Original assignee: 日産自動車株式会社
Priority date: 2014-08-29
Filing date: 2014-08-29
Publication date: 2016-03-03

Abstract

This battery cooling device for cooling a battery arranged in the passenger compartment of a vehicle is provided with an exhaust fan which sucks in air that was used to cool the battery, and with an exhaust duct (24) which allows communication between the discharge port of the exhaust fan and a structural space, which is the space inside the center pillar of the vehicle. The exhaust duct (24) is provided with a primary exhaust passage (42) which allows communication between the structural space and the exhaust port of the exhaust fan, and a bypass opening (44) which allows communication between the primary discharge passage (42) and the sub-carpet space formed under the floor carpet that forms the floor of the passenger compartment.

Description

Battery cooling system

The present invention relates to a technique for cooling an in-vehicle battery.

As a technique for cooling a vehicle-mounted battery mounted on an electric vehicle or the like, for example, there is a technique described in Patent Document 1.
In the technique described in Patent Document 1, a battery case containing a battery is disposed between a driver seat and a passenger seat. Further, an inlet and an outlet of a cooling medium passage through which the cooling medium passes are formed on the side surface of the battery case.

JP 2013-251158 A

However, in the technique described in Patent Document 1 described above, the outlet of the cooling medium passage opens toward the driver seat or the passenger seat in the vehicle interior. For this reason, there exists a possibility that the problem that the temperature in a vehicle interior rises by the exhaust_gas | exhaustion which cooled and heated the battery may generate | occur | produce.
The present invention has been made paying attention to the above-described problems, and an object of the present invention is to provide a battery cooling device capable of suppressing a temperature rise in the passenger compartment.

In order to solve the above-described problem, according to one aspect of the present invention, an exhaust duct communicates a space inside a vehicle body structure of a vehicle with an exhaust port of an intake device that intakes air that has cooled a battery disposed in the vehicle interior. .

According to one aspect of the present invention, it is possible to move the air that is cooled and heated by the battery and sucked by the intake device to the space inside the vehicle body structure by the exhaust duct.
For this reason, it is possible to suppress the air heated by cooling the battery from moving into the vehicle interior, thereby suppressing the temperature rise in the vehicle interior.

It is a conceptual diagram which shows the structure of a vehicle provided with the battery cooling device of 1st embodiment of this invention. It is a figure which shows schematic structure of the space under carpet. It is a figure which shows schematic structure of the battery cooling device of 1st embodiment of this invention. It is a figure which shows schematic structure of the battery cooling device of 1st embodiment of this invention. It is a figure which shows the structure of an exhaust duct. FIG. 6 is a view taken along line VI in FIG. 5. It is a figure which shows the relationship between the negative pressure which an exhaust fan generate | occur | produces, and the flow volume of the air moved to the space under carpet. It is a figure which shows the relationship between the temperature of the air which flows into the space under carpet, and the area of a bypass opening part. It is a figure which shows the modification of 1st embodiment of this invention.

Embodiments of the present invention will be described below with reference to the drawings.
(First embodiment)
Hereinafter, a first embodiment of the present invention (hereinafter referred to as a first embodiment) will be described with reference to the drawings.
(Constitution)
First, the configuration of a vehicle including the battery cooling device according to the first embodiment will be described with reference to FIG.
As shown in FIG. 1, the vehicle includes a battery 2, a floor carpet 4, and a center pillar 6. In FIG. 1, a part of the passenger compartment CR is shown for explanation.
The battery 2 is housed in a battery case (not shown). The battery case is housed in a console box 12 disposed between the driver's seat 8 and the passenger seat 10 in the passenger compartment CR. In FIG. 1, as an example, a configuration in which the driver's seat 8 is arranged on the left side (left-hand drive vehicle) is shown. However, the present invention is not limited to this configuration. Vehicle).

The battery case has an intake slit and an exhaust slit (not shown). The intake slit of the battery case opens to the driver seat 8 side of the battery case. The exhaust slit of the battery case opens to the passenger seat 10 side of the battery case. In addition, air passing through gaps formed between a plurality of cells (not shown) of the battery 2 moves between the intake slit and the exhaust slit of the battery case.
The floor carpet 4 is disposed below the driver seat 8 and the passenger seat 10 and forms a floor surface of the passenger compartment CR.
Further, a carpet lower space 16 is formed between the floor carpet 4 and the vehicle body side member (body) 14 (floor panel).
The center pillar 6 is disposed between a front door (not shown) and a rear door (not shown).

The center pillar 6 is formed by attaching a center pillar interior material 18 inside the vehicle body side member 14 (vehicle compartment CR side). Thereby, the center pillar 6 has a space (may be referred to as “structure space 20” in the following description) between the vehicle body side member 14 and the center pillar interior material 18.
The center pillar interior material 18 is formed of, for example, a resin material.
In the first embodiment, as an example, the structure space 20 includes an interior material, such as an interior material that forms a rear seat or a luggage compartment, and the vehicle body side member 14 and an interior material disposed behind the center pillar 6 in the vehicle longitudinal direction. The case where it communicates with the exterior of a vehicle through the internal space which exists in between is demonstrated.

Next, a schematic configuration of the battery cooling device 1 will be described using FIGS. 2 to 8 with reference to FIG.
As shown in FIGS. 2 to 4, the battery cooling device 1 includes an exhaust fan 22, an exhaust duct 24, and an exhaust movement restriction wall 26. 2 to 4, illustration of the floor carpet 4, the driver seat 8, the passenger seat 10, and the console box 12 is omitted for the sake of explanation. In FIG. 2, the exhaust duct 24 and the exhaust movement restriction wall 26 are not shown for explanation.

The exhaust fan 22 is disposed below the passenger seat 10 in the space 16 below the carpet.
The air supply port 28 of the exhaust fan 22 is connected to the intake duct 30.
The exhaust port 32 of the exhaust fan 22 communicates with the exhaust duct 24.
The intake duct 30 connects the exhaust slit 36 of the battery case 34 and the air supply port 28 of the exhaust fan 22. Specifically, the opening on the battery case 34 side of the intake duct 30 covers the exhaust slit 36 of the battery case 34. The opening on the exhaust fan 22 side of the intake duct 30 covers the air supply port 28 of the exhaust fan 22. 3 and 4, the illustration of the intake duct 30 is omitted for the sake of explanation.

As described above, when the exhaust fan 22 is operated, the exhaust fan 22 sucks air in the battery case 34 from the air supply port 28 and exhausts it from the exhaust port 32 to the exhaust duct 24.
The exhaust duct 24 is made of, for example, a resin material or the like and has a hollow shape with a quadrilateral cross section. The detailed configuration of the exhaust duct 24 will be described later.
The exhaust movement restriction wall 26 is disposed behind the exhaust fan 22 in the front-rear direction of the vehicle in the carpet lower space 16.
Further, the exhaust movement restriction wall 26 is formed by using, for example, urethane resin, and closes the rear of the exhaust fan 22 in the vehicle front-rear direction in the carpet lower space 16 so that the air at the rear of the exhaust fan 22 in the front-rear direction of the vehicle. Regulate the movement of

(Detailed configuration of the exhaust duct 24)
Next, a detailed configuration of the exhaust duct 24 will be described with reference to FIGS. 1 to 4 and FIGS. 5 to 8.
As shown in FIGS. 5 and 6, the exhaust duct 24 includes a battery side opening 38, a vehicle body side opening 40, a main exhaust passage 42, a bypass opening 44, and an opening surrounding flange 46.
The battery side opening 38 opens to the exhaust fan 22 side and communicates with the exhaust port 32 of the exhaust fan 22. Further, a connection portion between the battery side opening 38 and the exhaust port 32 of the exhaust fan 22 is covered with a fan side cover 48. Thus, the fan-side cover 48 closes a gap formed between the battery-side opening 38 and the exhaust port 32 of the exhaust fan 22.
The vehicle body side opening 40 opens toward the center pillar 6 side (upward) below the center pillar 6 and communicates with the structure space 20. Further, a connection portion between the vehicle body side opening 40 and the structure space 20 is covered with a cover (not shown) to close a gap formed between the vehicle body side opening 40 and the structure space 20.

In the first embodiment, the case where the opening area of the vehicle body side opening 40 is less than the opening area of the battery side opening 38 will be described as an example.
In the first embodiment, as an example, a case where the center of the vehicle body side opening 40 is arranged behind the center of the battery side opening 38 in the vehicle front-rear direction will be described.
In the first embodiment, as an example, the configuration of the exhaust duct 24 is such that the center line CL of the main exhaust passage 42 is viewed in two directions (plan view) as shown in FIG. The case where it is set as the structure which has the 1st inflection point P1 and the 2nd inflection point P2) is demonstrated. Specifically, as the center line CL of the main exhaust passage 42 moves from the battery side opening 38 side to the vehicle body side opening 40 side, first, the vehicle is bent at the first inflection point P1 to the rear side in the vehicle front-rear direction. Inclined with respect to the width direction. And it folds to the vehicle front-back direction front side at the second inflection point P2, and becomes parallel to the vehicle width direction.

The main exhaust passage 42 forms an internal space of the exhaust duct 24 and connects the exhaust port 32 of the exhaust fan 22 and the structure space 20.
In the first embodiment, as described above, the structure space 20 communicates with the outside of the vehicle. For this reason, the main exhaust passage 42 communicates with the outside air via the structure space 20. That is, the structure space 20 allows the main exhaust passage 42 and the outside air to communicate with each other. Moreover, the part which connects the main exhaust passage 42 to outside air via the structure space 20 among vehicles served as the attachment part to the vehicle body of the kicking plate (plate-shaped member arrange | positioned under the door), for example. It is an opening (drafter).
The bypass opening 44 is formed on the outer surface disposed between the battery side opening 38 and the vehicle body side opening 40 on the rear side of the exhaust duct 24 in the vehicle front-rear direction and opens into the under carpet space 16. As a result, the bypass opening 44 allows the main exhaust passage 42 and the under-carpet space 16 to communicate with each other.

The position where the bypass opening 44 is formed is between the first inflection point P1 and the second inflection point P2 on the outer surface of the exhaust duct 24 disposed behind the vehicle front-rear direction.
In FIG. 6, for explanation, a line EPL1 that passes through the first inflection point P1 and extends in the vehicle front-rear direction and a line EPL1 that passes through the second inflection point P2 and extends in the vehicle front-rear direction. A line EPL2 is shown.
That is, the bypass opening 44 has a position corresponding to the first inflection point P1 at which the center line CL bends rearward in the vehicle front-rear direction, and the center line CL of the outer surface disposed in the vehicle front-rear direction rearward of the exhaust duct 24. It forms between the position corresponding to the 2nd inflection point P2 bent to the vehicle front-back direction front side.

Accordingly, in the exhaust duct 24, a part of the air moving in the main exhaust passage 42 moves along the center line CL from the battery side opening 38 to the vehicle body side opening 40, and the first change of the center line CL is performed. It becomes the structure which moves to the bypass opening part 44 along the direction broken at the bending point P1.
As a result, the exhaust duct 24 increases from the battery side opening 38 to the bypass opening with respect to the flow rate of air moving from the battery side opening 38 to the vehicle body side opening 40 as the flow velocity of the air moving through the main exhaust passage 42 increases. The flow rate of the air moving to 44 increases.
The opening surrounding flange 46 is formed continuously with a portion of the outer surface of the exhaust duct 24 that is continuous with the bypass opening 44. In addition, the opening surrounding flange portion 46 projects rearward in the vehicle front-rear direction from the outer surface of the exhaust duct 24.

Therefore, the bypass opening 44 opens in a direction (vehicle longitudinal direction) orthogonal to the direction (vehicle width direction) in which the battery side opening 38 and the vehicle body side opening 40 are arranged.
Further, the shape and area of the bypass opening 44 are set to a shape and area in which the flow rate of the air that has cooled the battery 2 to the under-carpet space 16 increases as the flow velocity of the air that has cooled the battery 2 increases. .
Specifically, as shown in FIG. 7, as the negative pressure generated by the exhaust fan 22 (“negative pressure (Pa)” shown on the horizontal axis in FIG. 7) is increased, the exhaust fan 22 is moved to the under-carpet space 16. The flow rate of air (“flow distribution to bypass side” shown on the vertical axis in FIG. 7) is increased.

That is, the bypass opening 44 increases the negative pressure generated by the exhaust fan 22 and increases the flow rate of the air that has cooled the battery 2 to increase the flow rate of the air flowing into the under-carpet space 16. Set to area.
Further, the area of the bypass opening 44 is, for example, as shown in FIG. 8, when the temperature of the air flowing into the carpet lower space 16 is equal to or lower than a preset allowable temperature and is generated from the exhaust fan 22. It is assumed that the sound transmitted to the CR is an area that is equal to or lower than a preset volume. In FIG. 8, there is an area where the temperature of the air flowing into the carpet lower space 16 is lower than the allowable temperature, and the sound generated from the exhaust fan 22 and transmitted to the passenger compartment CR is lower than a preset volume. , Indicated by the symbol “BPA”.

Further, in FIG. 8, the allowable temperature is indicated by “AH”, and the upper limit value of the sound volume allowed as the sound generated from the exhaust fan 22 and transmitted to the passenger compartment CR is indicated by “Smax”. In FIG. 8, the temperature of the air flowing into the carpet lower space 16 is indicated on the vertical axis, and the area of the bypass opening 44 is indicated on the horizontal axis.
The position where the bypass opening 44 is opened is a position where the temperature is lower than the other positions in the carpet lower space 16. In the first embodiment, as an example, a case will be described in which the position at which the bypass opening 44 is opened is set to a position in the carpet lower space 16 that opens toward a space behind the exhaust duct 24 in the vehicle front-rear direction. .

(Operation)
Next, an example of an operation performed using the battery cooling device 1 of the first embodiment will be described with reference to FIGS.
When the vehicle including the battery cooling device 1 is used, the exhaust fan 22 is operated to suck the air in the battery case 34 from the air supply port 28 and exhaust it from the exhaust port 32 to the exhaust duct 24. The air heated by cooling the battery 2 moves.
The air that has moved into the exhaust duct 24 moves to the vehicle body side opening 40 and the bypass opening 44 via the main exhaust passage 42. The air that has moved to the vehicle body side opening 40 is released from the structure space 20 to the outside of the vehicle. In addition, after the air that has moved to the bypass opening 44 has moved to the under-carpet space 16, the movement of the exhaust fan 22 from the rear in the vehicle front-rear direction to the battery case 34 side is restricted by the exhaust movement restriction wall 26. Then, it moves in the space 16 under the carpet, and the temperature decreases.

For this reason, the battery 2 is cooled and heated, and a part of the air taken in by the exhaust fan 22 can be moved to the structure space 20 via the exhaust duct 24 and further released to the outside air. Thereby, it is possible to suppress the air heated by cooling the battery 2 from moving into the passenger compartment CR, and to suppress the temperature increase in the passenger compartment CR.
Moreover, in 1st embodiment, the flow volume to the space 16 under the carpet of the air which cooled the battery 2 increases, so that the flow velocity of the air intake of the air which cooled the battery 2 is high about the shape and area of the bypass opening part 44. Set to shape and area.
For this reason, it is possible to suppress an increase in the flow rate of the air that has cooled the battery 2 moving above the floor carpet 4 in a situation where the operating noise of the exhaust fan 22 is easily heard by the vehicle occupant, such as when the vehicle is stopped. Become. Thereby, it is possible to suppress an increase in noise felt by the vehicle occupant.
The exhaust fan 22 described above corresponds to an intake device.

(Effects of the first embodiment)
If it is 1st embodiment, it will become possible to show the effect described below.
(1) The exhaust fan 22 sucks in air that has cooled the battery 2. In addition, the exhaust duct 24 communicates the exhaust port 32 of the exhaust fan 22 and the structure space 20.
Therefore, it is possible to move the air heated by cooling the battery 2 and sucked by the exhaust fan 22 to the structure space 20 inside the vehicle body structure by the exhaust duct 24.
As a result, it is possible to suppress the air heated by cooling the battery 2 from moving into the passenger compartment CR, and to suppress the temperature rise in the passenger compartment CR.

(2) The exhaust duct 24 includes a main exhaust passage 42 that allows the exhaust port 32 and the structure space 20 to communicate with each other, and a bypass opening 44 that allows the under-carpet space 16 and the main exhaust passage 42 to communicate with each other.
For this reason, the air heated by cooling the battery 2 via the exhaust duct 24 can be branched and moved to the structure space 20 and the under-carpet space 16.
As a result, the air heated by cooling the battery 2 can be prevented from moving into the passenger compartment CR, and the temperature rise in the passenger compartment CR can be suppressed, and the structure space 20 can be moved. It is possible to suppress an increase in noise transmitted to the passenger compartment CR due to the air that flows.
Further, even when the distance between the occupant and the structure space 20 is short, for example, when the vehicle size of the vehicle is small, the battery 2 is cooled and a part of the heated air is moved to the under-carpet space 16. It becomes possible to make it.
Therefore, even if the noise transmitted to the passenger compartment CR by the air moving through the structure space 20 is easily heard by the occupant, it is possible to suppress the temperature rise in the passenger compartment CR and to the passenger compartment CR. It is possible to suppress an increase in noise to be transmitted.

(3) The exhaust duct 24 is formed so that the flow rate of the air that has cooled the battery 2 to the under-carpet space 16 increases as the flow rate of the air that has cooled the battery 2 increases.
For this reason, it is possible to suppress an increase in the flow rate of the air that has cooled the battery 2 moving above the floor carpet 4 in a situation where the operating noise of the exhaust fan 22 is easily heard by the vehicle occupant, such as when the vehicle is stopped. Become.
As a result, the air heated by cooling the battery 2 can be prevented from moving into the passenger compartment CR, and the temperature rise in the passenger compartment CR can be suppressed, and the noise felt by the vehicle occupant It is possible to suppress the increase in

(4) The structure space 20 is a space inside the center pillar 6.
As a result, it is possible to form the structure space 20 using the existing configuration of the vehicle.
(5) The structure space 20 is a space that communicates the main exhaust passage 42 with the outside of the vehicle.
As a result, the air heated by cooling the battery 2 can be discharged to the outside air.
(6) The exhaust duct 24 allows the exhaust port 32 of the exhaust fan 22 that sucks in air that has cooled the battery 2 to communicate with the structure space 20. In addition, the structure space 20 is a space that communicates the main exhaust passage 42 with the outside of the vehicle. Thus, the structure space 20 is disposed between the exhaust duct 24 and the outside of the vehicle.
As a result, compared with the case where the main exhaust passage 42 communicates with the outside of the vehicle, it is possible to suppress the entry of foreign matter such as rainwater and dust into the exhaust duct 24 and the carpet lower space 16 from the outside of the vehicle. Become.

(Modification)
(1) In the first embodiment, the structure space 20 is a space inside the center pillar 6, but is not limited thereto. That is, as shown in FIG. 9, the structure space 20 may be a space between the ceiling 50 and the roof panel 52 of the vehicle. FIG. 9 shows a case where the structure space 20 is formed by a space between the ceiling 50 and the roof panel 52 of the vehicle and a space inside the center pillar 6.
In this case, the battery 2 is cooled and heated, and it is possible to increase the number of objects to which the air sucked by the exhaust fan 22 is moved by the exhaust duct 24.

(2) In the first embodiment, the flow rate of the air that has cooled the battery 2 to the space 16 below the carpet increases as the flow velocity of the air that has cooled the battery 2 increases. Although it set to the shape and area to perform, it is not limited to this. That is, for example, a valve is disposed inside the exhaust duct 24 and further includes an actuator that can change the opening degree of the valve disposed inside the exhaust duct 24. And it is good also as a structure which changes the flow volume to the space 16 under the carpet of the air which cooled the battery 2 according to the opening degree of a throttle valve or an accelerator pedal.
Although the present invention has been described with reference to a limited number of embodiments, the scope of rights is not limited thereto, and modifications of each embodiment based on the above disclosure are obvious to those skilled in the art.

DESCRIPTION OF SYMBOLS 1 ... Battery cooling device, 2 ... Battery, 4 ... Floor carpet, 6 ... Center pillar, 8 ... Driver's seat, 10 ... Passenger seat, 12 ... Console box, 14 ... Car body side member, 16 ... Space under carpet, 18 ... Center Pillar interior material, 20 ... structure space, 22 ... exhaust fan, 24 ... exhaust duct, 26 ... exhaust movement restriction wall, 28 ... exhaust fan air supply port, 30 ... intake duct, 32 ... exhaust fan exhaust port, 34 ... battery case, 36 ... exhaust slit, 38 ... battery side opening, 40 ... vehicle body side opening, 42 ... main exhaust passage, 44 ... bypass opening, 46 ... opening surrounding flange, 48 ... fan side cover, 50 ... Ceiling, 52 ... Roof panel, CR ... Cab, CL ... Center line of main exhaust passage, P1 ... First inflection point, P2 ... Second inflection point, EPL1 ... Vehicle passing through the first inflection point in front Extending in a direction line, EPL2 ... second variable through the inflection point extends in the vehicle longitudinal direction line

Claims

A battery cooling device for cooling a battery disposed in a vehicle interior of a vehicle,
An air intake device for taking in air that has cooled the battery;
A battery cooling device comprising: an exhaust duct that communicates an exhaust port of the intake device and a structure space that is a space inside a vehicle body structure of the vehicle.
The vehicle includes a floor carpet that forms a floor surface of the vehicle compartment,
The exhaust duct includes a main exhaust passage that communicates the exhaust port and the structure space, and a bypass opening that communicates the main exhaust passage and a carpet lower space formed between the vehicle body structure and the floor carpet. And a battery cooling device according to claim 1.
3. The battery cooling device according to claim 2, wherein the exhaust duct is formed such that the flow rate of the air that has cooled the battery to the space under the carpet increases as the flow rate of the intake air increases.
The battery cooling device according to any one of claims 1 to 3, wherein the structure space is a space inside a center pillar of the vehicle.
The battery cooling device according to any one of claims 1 to 4, wherein the structure space is a space between a ceiling of the vehicle compartment and a roof panel of the vehicle.
The battery cooling device according to any one of claims 1 to 5, wherein the structure space communicates the main exhaust passage and the outside of the vehicle.