JP5942611B2 - Electric vehicle battery pack cooling structure - Google Patents

Description

  The present invention relates to a cooling structure for a battery pack mounted on an electric vehicle, and is particularly suitable for an air-cooled battery pack cooling structure that cools cells inside the battery pack by introducing outside air.

  In an electric vehicle, a voltage is set high in order to efficiently drive a motor as a driving source, and a large current flows when the motor is driven. Therefore, the internal temperature of the battery pack that houses the battery (also referred to as a battery module) increases. As this battery pack cooling structure, for example, there is one described in Patent Document 1 below. In this battery pack cooling structure, the battery pack is mounted in the cargo compartment behind the rear seat, and the batteries in the battery pack are cooled by the outside air, so the intake and exhaust ducts for cooling are arranged between the interior interior and the body panel. doing.

JP 2004-1683 A

  However, loading a large amount of batteries in order to increase the cruising distance sacrifices the cargo space. In particular, when a large amount of batteries are mounted on a small car, a luggage space cannot be secured. In view of this, the battery pack is mounted outside the vehicle compartment. However, when an air intake and exhaust port for cooling the battery pack is provided outside the vehicle compartment, rainwater and foreign matter are likely to enter the battery pack.

  The present invention has been made paying attention to the above-described problems, and prevents rainwater and foreign matter from entering the battery pack when the battery pack disposed outside the passenger compartment is cooled by outside air. It is an object of the present invention to provide a battery pack cooling structure for an electric vehicle that can be used.

In order to solve the above-described problems, an aspect of the invention is to cool a battery pack that is disposed outside a passenger compartment behind a rear seat and stores a battery, and that the battery stored inside is introduced by introducing outside air into the battery pack. An electric vehicle battery pack cooling structure including a cooling fan configured to cover a floor panel formed behind the rear seat and having an opening into which an upper portion of the battery pack is inserted, and an upper portion of the battery pack. A cover panel attached to the floor panel;
An intake duct that is provided in the battery pack and introduces outside air into the battery pack; and is opened toward a space between a ceiling surface of the cover panel and a top surface of the battery pack that is provided in the intake duct, and An air intake port that communicates with an air intake port for taking outside air into the battery pack through the air intake duct, an exhaust duct that is provided in the battery pack and exhausts air inside the battery pack, and is provided in the exhaust duct and above the battery pack. Alternatively, the battery pack cooling structure for an electric vehicle includes an exhaust port that opens toward the rear of the battery pack when the battery pack is mounted on the vehicle and exhausts air in the battery pack.

Further, a battery pack cooling structure for an electric vehicle according to claim 1, characterized in that opens toward the front SL inlet in front of the vehicle at a position adjacent to the front edge of the top surface of the battery pack.

  Further, the intake duct is composed of a duct main body portion and a cover portion that can be divided in the vertical direction, and a filter element for removing foreign matters contained in the air is disposed between the duct main body portion and the cover portion. The battery pack cooling structure of the electric vehicle characterized by the above.

  In the electric vehicle battery pack cooling structure, a service lid for performing maintenance work on the filter element is formed on a ceiling surface of the cover panel.

  The exhaust port opens to the rear of the vehicle at a position shifted in the vehicle width direction with respect to the intake port.

  The battery pack of the electric vehicle, characterized in that an exhaust duct that communicates between the air discharge port for discharging the air in the battery pack and the exhaust port is disposed in a gap between the cover panel and the battery pack. Cooling structure.

  Thus, according to one aspect of the invention, the battery pack that houses the battery is disposed outside the vehicle compartment behind the rear seat, and the outside air is introduced into the battery pack by the cooling fan to cool the battery accommodated therein. In this case, an opening into which the upper part of the battery pack is inserted is formed in the floor panel arranged behind the rear seat, and the cover panel is attached to the floor panel so as to cover the upper part of the battery pack. In addition, an intake port for sucking outside air for cooling into the battery pack is opened in a space between the ceiling surface of the cover panel and the top surface of the battery pack, and an exhaust port for exhausting air in the battery pack is provided. . Therefore, the height of the intake port for inhaling outside air can be increased, and rainwater splashed from below is blocked by the battery pack itself, the floor panel, and the cover panel, and rainwater entering the battery pack from the intake port and Intrusion of foreign matter can be prevented.

  In addition, an air intake duct that communicates between the air intake port for taking outside air into the battery pack and the air intake port is arranged on the top surface of the battery pack, and is positioned in front of the vehicle at a position adjacent to the front edge of the battery pack top surface. Open the air inlet. Therefore, the rain water splashed up to the upper side of the battery pack in front of the vehicle at the intake port can be prevented from falling in front of the battery pack and entering the intake port.

  In addition, an intake duct is constituted by a duct main body part and a cover part that can be divided in the vertical direction, and a filter element for removing foreign substances contained in the air is disposed between the duct main body part and the cover part. Therefore, it is possible to prevent foreign matter from entering the battery pack.

  In addition, a service lid for performing maintenance work of the filter element is formed on the ceiling surface of the cover panel. Therefore, the maintenance workability of the filter element is improved.

  Further, the exhaust port is opened to the rear of the vehicle at a position shifted in the vehicle width direction with respect to the intake port. Therefore, warm air from the exhaust port can be prevented from being sucked from the intake port.

  In addition, an exhaust duct that communicates between the air discharge port that discharges air in the battery pack and the exhaust port is disposed in a gap between the cover panel and the battery pack. Therefore, the height of the exhaust port can be increased, and rainwater splashed from below is blocked by the battery pack itself, the floor panel, and the cover panel to prevent rainwater and foreign matter from entering the battery pack from the exhaust port. Can be prevented.

1 is a left longitudinal sectional view of a schematic structure of an electric vehicle showing a first embodiment of a battery pack cooling structure for an electric vehicle of the present invention. It is the longitudinal cross-sectional view which looked at the battery pack of FIG. 1 from the front. It is a perspective view which shows the mounting method of the battery pack of FIG. It is a perspective view of the state which removed the cover panel of the battery pack cooling structure of FIG. It is a perspective view of the air intake duct and cover panel of FIG. It is a left longitudinal cross-sectional view of the battery pack cooling structure of FIG. It is a perspective view of the battery pack which shows 2nd Embodiment of the battery pack cooling structure of the electric vehicle of this invention.

  Next, a first embodiment of a battery pack cooling structure for an electric vehicle according to the present invention will be described with reference to the drawings. FIG. 1 is a left longitudinal sectional view of an electric vehicle to which the battery pack cooling structure of the present embodiment is applied. The electric vehicle of this embodiment is a small vehicle having a two-row seat of a front seat 1 and a rear seat 2. Behind the rear seat 2, a luggage compartment 3, generally called a luggage room, is provided continuously with the vehicle compartment 4. In the present embodiment, the battery pack 5 is mounted outside the passenger compartment below the cargo compartment 3. As shown in FIG. 2, a battery (battery module) 6 is housed in the battery pack 5, and a motor (not shown) is driven by the electric power of the battery 6 to obtain a driving force of the vehicle. In the battery pack 5, a cooling fan 8 for introducing outside air to cool the battery 6 is provided.

  A floor panel 7 is provided below the passenger compartment 4 and the cargo compartment 3. The floor panel 7 literally constitutes the floor surfaces of the passenger compartment 4 and the cargo compartment 3, and is provided in series from a so-called dash panel on the front surface of the passenger compartment 4 to the rear end of the cargo compartment 3. In this embodiment, as shown in FIG. 3, an opening 9 is formed in the floor panel 7 of the luggage compartment 3 behind the rear seat 2, and the upper part of the battery pack 5 is inserted into the opening 9. The battery pack 5 is attached to the vehicle body in a state of being mounted on a subframe (not shown), for example, and as a result, as shown in FIG. 4, the battery pack 5 penetrates the opening 9 of the floor panel 7 in the vertical direction. As shown in FIG. 5, the upper portion of the battery pack 5 that penetrates the opening 9 of the floor panel 7 is covered with a cover panel 12 that protrudes toward the cargo compartment 3, and the cover panel 12 is attached to the floor panel 7.

  In the present embodiment, an intake duct 10 for introducing outside air into the battery pack 5 and an exhaust duct 11 for exhausting air inside the battery pack 5 are provided on the top surface of the battery pack 5. As shown in FIG. 6, the intake duct 10 communicates an air intake port 13 for taking outside air into the battery pack 5 and an intake port 14. Further, the exhaust duct 11 communicates the air exhaust port 15 for exhausting the air in the battery pack 5 and the exhaust port 16. That is, the intake duct 10 and the exhaust duct 11 are both located in the gap between the cover panel 12 and the battery pack 5, and the intake port 14 and the exhaust port 16 are the ceiling surface of the cover panel 12 and the top surface of the battery pack 5. There is an opening in the space between. The cooling fan 8 described above is attached to the inside of the battery pack 5 upstream of the air discharge port 15.

  In the present embodiment, the intake port 14 opens toward the front of the vehicle at a position adjacent to the front edge portion of the top surface of the battery pack 5, and the exhaust port 16 is positioned at a position adjacent to the rear edge portion of the top surface of the battery pack. It opens toward the rear of the vehicle. In addition, since the intake duct 10 and the exhaust duct 11 are shifted in the vehicle width direction, the intake port 14 and the exhaust port 16 are also shifted in the vehicle width direction. That is, since the exhaust port 16 opens in the direction opposite to the opening direction of the intake port 14, warm air exhausted from the exhaust port 16 can be prevented from being introduced from the intake port 14.

  The intake duct 10 includes a duct body portion 17 on the top surface side of the battery pack 5 that can be divided in the vertical direction and a cover portion 18 that covers the duct body portion 17. A filter element 19 that removes foreign matter contained in the air is disposed between the duct main body portion 17 and the cover portion 18. As indicated by solid arrows in FIG. 6, the outside air sucked from the intake port 14 passes through the filter element 19 and is taken into the battery pack 5 from the air intake port 13. At that time, foreign matters contained in the outside air (air) are collected by the filter element 19. Also, as indicated by the dashed arrows in FIG. 6, the outside air taken into the battery pack 5 from the air intake port 13 cools the internal battery 6, passes through the cooling fan 8, and passes from the air exhaust port 15 to the exhaust port 16. Exhausted.

  In the present embodiment, the ceiling panel (ceiling surface) of the cover panel 12 is detachable, and the ceiling panel serves as the service lid 20. When the above-described filter element 19 is maintained, the service lid 20 of the cover panel 12 is opened, and the cover portion 18 of the intake duct 10 is opened. After the maintenance of the filter element 19, the cover portion 18 of the intake duct 10 is closed, and then the service lid 20 of the cover panel 12 is closed. The service lid 20 facilitates maintenance of the filter element 19.

  FIG. 7 is a perspective view of the battery pack 5 showing a second embodiment of the battery pack cooling structure for an electric vehicle of the present invention. The battery pack 5 of the present embodiment is similar to the battery pack 5 of the first embodiment and has many equivalent configurations. Therefore, the same components are denoted by the same reference numerals, and detailed description thereof is omitted. In the present embodiment, the exhaust duct 11 is provided not on the top surface of the battery pack 5 but on the vehicle rear side surface. The exhaust port 16 opens to the rear of the vehicle. Also in this embodiment, the exhaust duct 11 is disposed in the gap between the cover panel 12 and the battery pack 5.

  As described above, in the battery pack cooling structure of the electric vehicle according to the embodiment, the battery pack 5 that houses the battery 6 is disposed outside the vehicle compartment 4 behind the rear seat 2, and the outside air is introduced into the battery pack 5 by the cooling fan 8. When the battery 6 accommodated therein is cooled, an opening 9 into which the upper part of the battery pack 5 is inserted is formed in the floor panel 7 arranged behind the rear seat 2 to cover the upper part of the battery pack 5. The cover panel 12 is attached to the floor panel 7 as described above. Then, the air inlet 14 for sucking the outside air for cooling into the battery pack 5 is opened in a space between the ceiling surface of the cover panel 12 and the top surface of the battery pack 5 and the air in the battery pack 5 is exhausted. An exhaust port 16 was provided. Therefore, the height of the intake port 14 for sucking outside air can be increased, and the rain water splashed from below is blocked by the battery pack 5 itself, the floor panel 7 and the cover panel 12 so that the battery pack from the intake port 14 is blocked. Intrusion of rainwater or foreign matter into the inside 5 can be prevented.

  In addition, an air intake duct 10 that communicates between the air intake port 13 for taking outside air into the battery pack 5 and the air intake port 14 is disposed on the top surface of the battery pack 5, and is adjacent to the front edge of the top surface of the battery pack 5. The intake port 14 is opened toward the front of the vehicle at a position where Therefore, rainwater splashed up to the upper side of the battery pack 5 in front of the vehicle at the intake port 14 can be prevented from falling in front of the battery pack 5 and entering the intake port 14.

  The duct body portion 17 and the cover portion 18 that can be divided in the vertical direction constitute the intake duct 10, and a filter element 19 that removes foreign matters contained in the air is interposed between the duct body portion 17 and the cover portion 18. Deploy. Therefore, foreign matter can be prevented from entering the battery pack 5.

  In addition, a service lid 20 for performing maintenance work on the filter element 19 is formed on the ceiling surface of the cover panel 12. Therefore, the maintenance workability of the filter element 19 is improved.

  Further, the exhaust port 16 is opened to the rear of the vehicle at a position shifted in the vehicle width direction with respect to the intake port 14. Therefore, warm air from the exhaust port 16 can be prevented from being sucked from the intake port 14.

  Further, an exhaust duct 11 that communicates between the air exhaust port 15 that exhausts the air in the battery pack 5 and the exhaust port 16 is disposed in the gap between the cover panel 12 and the battery pack 5. Therefore, the height of the exhaust port 16 can be increased, and rain water splashed from below is blocked by the battery pack 5 itself, the floor panel 7 and the cover panel 12 to enter the battery pack 5 from the exhaust port 16. Intrusion of rainwater and foreign matter can be prevented.

1 is a front seat 2 is a rear seat 3 is a luggage compartment 4 is a passenger compartment 5 is a battery pack 6 is a battery 7 is a floor panel 8 is a cooling fan 9 is an opening 10 an intake duct 11 is an exhaust duct 12 is a cover panel 13 is an air intake Port 14 is an intake port 15 is an air discharge port 16 is an exhaust port 17 is a duct body 18 is a cover unit 19 is a filter element 20 is a service lid

Claims (6)

A battery pack disposed outside the passenger compartment behind the rear seat and storing the battery;
In the battery pack cooling structure of an electric vehicle comprising a cooling fan that introduces outside air into the battery pack and cools the battery accommodated therein,
A floor panel disposed behind the rear seat and having an opening into which the upper part of the battery pack is inserted; and
A cover panel attached to the floor panel so as to cover the top of the battery pack;
An intake duct provided in the battery pack for introducing outside air into the battery pack;
An intake port that is provided in the intake duct and opens toward a space between the ceiling surface of the cover panel and the top surface of the battery pack, and communicates with an air intake port that takes outside air into the battery pack by the intake duct. When,
An exhaust duct provided in the battery pack for discharging air inside the battery pack;
An exhaust port that is provided in the exhaust duct and opens toward the rear of the battery pack when the battery pack is mounted on the vehicle or in a state in which the battery pack is mounted on the vehicle, and has an exhaust port that exhausts air in the battery pack. Electric vehicle battery pack cooling structure. Battery pack cooling structure for an electric vehicle according to claim 1, characterized in that opening toward the front of the vehicle at a position adjacent to the front edge of the front Symbol inlet top surface of the battery pack.

The intake duct is composed of a duct body portion and a cover portion that can be divided in the vertical direction,
The battery pack cooling structure for an electric vehicle according to claim 2, wherein a filter element for removing foreign substances contained in the air is disposed between the duct main body portion and the cover portion.   4. The battery pack cooling structure for an electric vehicle according to claim 3, wherein a service lid for performing maintenance work on the filter element is formed on a ceiling surface of the cover panel.   The battery pack cooling structure for an electric vehicle according to any one of claims 1 to 4, wherein the exhaust port opens rearward of the vehicle at a position shifted in a vehicle width direction with respect to the intake port.   6. The electricity according to claim 5, wherein an exhaust duct that communicates between an air discharge port that discharges air in the battery pack and the exhaust port is disposed in a gap between the cover panel and the battery pack. Automobile battery pack cooling structure.

Images