JP5910327B2 - Exhaust device for vehicle battery pack - Google Patents

Description

  The present invention relates to an exhaust device for a vehicle battery pack, and more particularly to an exhaust device for a vehicle battery pack mounted on the rear part of a hybrid vehicle or an electric vehicle.

  As a conventional vehicle battery pack, a structure is disclosed in which a power supply unit is attached below a rear floor formed on the vehicle rear side of the rear seat (see, for example, Patent Document 1). In this structure, an exhaust pipe having a muffler disposed below the rear floor is disposed on the side of the cooling air discharge port of the power supply unit in the vehicle width direction.

JP 2010-285151 A

  In the above-described conventional structure, the downstream end portion of the exhaust pipe and the exhaust duct provided with the cooling air discharge port are disposed close to each other in the same space. Also, with this conventional structure, when the fan of the power supply unit stops when the vehicle is running or when the vehicle is temporarily stopped, for example, when a signal is stopped in a traffic jam, a part of the exhaust gas discharged from the exhaust pipe is cooled air. There is a risk of flowing to the outlet side. In this case, the exhaust gas immediately reaches the cooling air discharge port and easily flows from the cooling air discharge port into the power supply unit. Therefore, in this conventional structure, the flow of exhaust gas may cause corrosion or rust in the connection part (for example, bus bar) that is a metal part used in the power supply unit, leading to deterioration in battery performance. . Further, in the above-described conventional structure, the cooling air discharge port is formed so as to extend substantially straight from the main body of the power supply unit toward the vehicle rear side. For this reason, once the exhaust gas containing moisture and the water to be washed at the time of car washing enter the cooling air discharge port, it flows into the main body of the power supply unit, and as described above, corrosion and rust occur on the metal parts, There is a risk of battery performance degradation.

  Accordingly, the present invention has been made in view of the above-described problems, and prevents exhaust gas discharged from water or an exhaust pipe from flowing into the battery pack through the exhaust duct and cooling the battery. It is an object of the present invention to provide an exhaust device for a vehicle battery pack that can prevent the performance from being lowered.

  In order to solve the above-described problems and achieve the object, one aspect of the present invention provides a pair of left and right side members provided below the rear floor panel on the rear side in the vehicle front-rear direction with respect to the rear seat. Is provided with a back panel extending downward from the rear floor panel, an exhaust pipe is disposed so as to extend rearwardly in the vehicle front-rear direction from the engine through the lower part of the rear floor panel, and at a downstream end of the exhaust pipe. The exhaust gas discharge port is mounted on a vehicle that is unevenly arranged on one side in the vehicle width direction at the rear of the vehicle, and a battery is mounted on the rear surface of the rear side in the vehicle front-rear direction of a battery pack that houses a battery that generates high voltage. In the exhaust device for a vehicle battery pack provided with an exhaust duct for discharging the air flowing inside the pack to the outside, an opening is formed in the rear floor panel, The battery pack is arranged on the other side in the vehicle width direction from the exhaust gas discharge port, and the upper part of the battery pack is arranged to protrude upward through the opening, and the air introduction port of the exhaust duct is arranged in the vehicle width of the battery pack. One side of the direction and projecting above the rear floor panel, the air outlet of the exhaust duct is located on the other side in the vehicle width direction opposite the exhaust pipe with respect to the air inlet, and the air outlet is It is arranged in a space surrounded by a rear floor panel and a back panel.

  As the above aspect, the vertical wall portion is formed at the rear opening edge on the rear side in the vehicle longitudinal direction of the opening so as to extend downward in the vehicle, the exhaust duct passes through the lower side of the vertical wall portion, and the air discharge port It is preferable to be arranged on the rear side in the vehicle front-rear direction with respect to the vertical wall portion.

  As the above aspect, it is preferable that the bottom surface portion of the exhaust duct is gradually inclined downward from the air introduction port toward the air discharge port.

  As said aspect, it is preferable that an air discharge port is arrange | positioned in the edge part far from an exhaust pipe among the edge parts of the vehicle width direction of a back panel.

  According to the present invention, an exhaust device for a vehicle battery pack capable of preventing the exhaust gas discharged from the water or the exhaust pipe from flowing into the battery pack through the exhaust duct and preventing the battery cooling performance from deteriorating. Can be realized.

FIG. 1 is a side view of a vehicle equipped with an exhaust device for a vehicle battery pack according to an embodiment of the present invention. FIG. 2 is a plan view of the rear portion of the vehicle on which the exhaust device for the vehicle battery pack according to the embodiment of the present invention is mounted. FIG. 3 is an explanatory side view of the rear portion of the vehicle on which the exhaust device for the vehicle battery pack according to the embodiment of the present invention is mounted. FIG. 4 is a rear view showing a state in which the exhaust device for a vehicle battery pack according to the embodiment of the present invention is mounted. FIG. 5 is an explanatory plan view of the periphery of the vehicle battery pack according to the embodiment of the present invention. FIG. 6 is an explanatory side view showing a modification of the exhaust device for a vehicle battery pack according to the embodiment of the present invention. FIG. 7 is a rear view of a modification showing a state in which the exhaust device for a vehicle battery pack according to the embodiment of the present invention is mounted.

  Details of an exhaust device for a vehicle battery pack (hereinafter referred to as a battery pack) according to an embodiment of the present invention will be described below with reference to the drawings. In the present embodiment, for convenience of explanation, the front-rear direction, the left-right direction, and the up-down direction of the vehicle are indicated by arrows in the drawing.

[Schematic configuration of vehicle]
The battery pack 2 including the exhaust device 1 according to the present embodiment is mounted on a vehicle such as a hybrid vehicle or an electric vehicle, for example. As shown in FIGS. 1 and 3, the battery pack 2 is disposed on the rear side in the vehicle front-rear direction with respect to the rear seat 102 in the vehicle rear portion 101 of the vehicle 100. The rear seat 102 includes a seat cushion 102A and a seat back 102B. Therefore, more specifically, the battery pack 2 is disposed behind the seat cushion 102A in the vehicle front-rear direction.

  As shown in FIG. 2, a pair of rear side members 103 extending in the vehicle front-rear direction are provided on both sides of the vehicle rear portion 101 in the vehicle width (left-right) direction. A rear floor panel 104 is provided on the rear side members 103. In the vehicle rear portion 101, rear wheels 105 are arranged on both sides in the vehicle width direction so as to sandwich the rear floor panel 104 therebetween. The rear floor panel 104 is formed with a substantially rectangular opening 108 into which the upper part of the battery pack 2 is inserted. In particular, in the present embodiment, the rear opening edge (one side) 108A located on the rear side in the vehicle front-rear direction in the opening 108 is formed to be curved in a concave shape toward the rear in the vehicle front-rear direction.

  As shown in FIG. 3, in the present embodiment, the vertical wall 108B extends from the rear opening edge 108A of the opening 108 toward the vehicle lower side. The rear floor panel 104 is provided with a cylindrical cover panel 109 formed so as to cover the upper part of the opening 108. A lid 110 is attached to the upper opening of the cover panel 109.

  As shown in FIG. 3, a rear bumper 106 is provided along the vehicle width direction on the rear side of the rear floor panel 104 in the vehicle front-rear direction. As shown in FIG. 2, a back panel 107 is provided along the vehicle width direction at the rear end portion 103A of the pair of side members 103 in the vehicle front-rear direction. As shown in FIGS. 1 and 3, the back panel 107 is arranged so as to extend below the rear floor panel 104.

  As shown in FIG. 1, an exhaust pipe 112 is arranged in the vehicle 100 so as to extend from the engine 111 below the rear floor panel 104 toward the rear in the vehicle front-rear direction. As shown in FIG. 4, the exhaust gas discharge port 112 </ b> A at the downstream end of the exhaust pipe 112 is disposed below the rear end of the vehicle rear portion 101. Further, the exhaust gas discharge port 112 </ b> A is unevenly arranged on the right side of the vehicle as one side in the vehicle width direction in the space below the vehicle rear portion 101.

[Battery pack and exhaust system]
Next, the exhaust device 1 according to the present embodiment will be described. The exhaust device 1 is provided integrally with the battery pack 2. As shown in FIG. 3, the battery pack 2 includes a case 21, a plurality of batteries 22 housed in the case 21, a cooling fan 31 provided in the case 21, and cooling air from the cooling fan 31. And an exhaust duct 32 that guides the outside to the outside of the case 21.

  As shown in FIGS. 2 to 5, the battery pack 2 is held in a state where the upper portion is inserted into the opening 108 formed in the rear floor panel 104. As described above, the upper portion of the battery pack 2 has a cylindrical cover panel 109 formed so as to rise from the peripheral edge of the opening 108 of the rear floor panel 104, and a lid 110 attached to the upper opening of the cover panel 109. Covered with. For this reason, the cover panel 109 and the lid 110 define a space on the cargo compartment side and a space in which the battery pack 2 is disposed. In the space where the battery pack 2 is arranged, air can be introduced from outside the vehicle.

  As shown in FIG. 3, the case 21 is a substantially rectangular parallelepiped housing formed of a material having electrical insulation. As shown in FIG. 2, the planar contour of the case upper portion 21 </ b> A, which is the upper portion of the case 21, is formed to a size that fits within the opening 108. In addition, the case lower portion 21B below the case upper portion 21A in the case 21 has a larger planar outline than the case upper portion 21A. That is, in case 21, case upper part 21A is formed small, and case lower part 21B part is formed large.

  A module in which a plurality of batteries 22 are combined is housed in the case 21 so as to form a plurality of stages. Generally, the rear floor panel 104 is provided at a position higher than the floor of the front passenger compartment. Therefore, in the present embodiment, case lower portion 21 </ b> B in battery pack 2 is arranged using a large space below rear floor panel 104. Therefore, in the present embodiment, battery pack 2 having a large capacity and size as a whole can be efficiently mounted in the space above and below rear floor panel 104.

  As shown in FIG. 3, an air cleaner 23 is placed on the case upper portion 21A. The air cleaner 23 contains an air filter (not shown) inside. As shown in FIG. 2, the case upper portion 21 </ b> A is provided with an intake port 25 through which air is introduced from the air cleaner 23.

  As shown in FIG. 3, the exhaust device 1 according to the present embodiment includes a cooling fan 31 and an exhaust duct 32. The cooling fan 31 is disposed in the upper part of the case 21 of the battery pack 2 and generates cooling air that passes through the case 21 and cools the battery 22. The cooling fan 31 is driven so as to exhaust the cooling air introduced into the case 21 toward an exhaust opening 24 (see FIG. 4) formed on the rear surface portion 2R side of the case upper portion 21A.

  As shown in FIG. 4, the exhaust opening 24 is disposed at a position above the rear floor panel 104 in the rear surface portion 2 </ b> R of the battery pack 2. Further, the exhaust opening 24 is disposed in the vicinity of the edge of the rear surface 2R on the side close to the exhaust pipe 112 (right side in the vehicle width direction).

  As shown in FIG. 4, the exhaust duct 32 is provided so that an air inlet 32 </ b> A that is an upstream end is communicated with the exhaust opening 24 of the case 21. The exhaust duct 32 is formed so as to extend in a cylindrical shape from one (right) side in the vehicle width direction toward the other (left) side along the rear surface portion 2R of the battery pack 2. As shown in FIG. 3, the air discharge port 32B, which is the downstream end of the exhaust duct 32, is disposed in a space S surrounded by the rear floor panel 104 and the back panel 107 through the lower portion of the vertical wall portion 108B. . The air discharge port 32 </ b> B of the exhaust duct 32 is opened toward the rear side in the vehicle front-rear direction, and discharges cooling air F toward the rear back panel 107 below the rear floor panel 104. As shown in FIG. 4, the air discharge port 32B is arranged on the other side (left side) in the vehicle width direction opposite to the exhaust pipe 112 with respect to the air introduction port 32A. Note that the space S is a space where the rear floor panel 104 exists above and the back panel 107 exists behind the vehicle in the front-rear direction.

[Action and effect]
Although the configuration of the exhaust device 1 of the battery pack 2 according to the present embodiment has been described above, the operation and effect of the exhaust device 1 will be described below.

  In the exhaust device 1 of the present embodiment, the rear floor panel 104 can partition the space where the air inlet 32A of the exhaust duct 32 is disposed and the space where the exhaust pipe 112 is disposed in the vehicle vertical direction. For this reason, in the present embodiment, it is possible to prevent the hot air in the exhaust pipe 112 from being shielded by the rear floor panel 104 and flowing into the vicinity of the air inlet 32 </ b> A of the exhaust duct 32. Thereby, it is possible to suppress the vicinity of the air inlet 32A of the exhaust duct 32 from being heated. That is, in the exhaust device 1, it is possible to prevent heat from being transmitted from the downstream side (exhaust opening 24) inside the battery pack 2 to the inside of the battery pack 2 and excessively increasing the temperature of the battery 22. Therefore, in the exhaust device 1 of the present embodiment, it is possible to prevent the battery performance from deteriorating.

  In the exhaust device 1 of the present embodiment, the air discharge port 32B of the exhaust duct 32 is heated (warmed) by the battery 22 in order to open the space S surrounded by the rear floor panel 104 and the back panel 107. Air is discharged from the exhaust duct 32 into the space S. At this time, the rear floor panel 104 functions to prevent air from flowing from the space S into the vehicle interior behind the rear seat. As a result, the air once discharged from the exhaust duct 32 to the outside can be prevented from flowing into the battery pack 2 again through the air cleaner 23 and the suction port 25 of the battery pack 2. Therefore, in the exhaust device 1 of the present embodiment, the battery cooling performance can be enhanced.

  In the present embodiment, the back panel 107 is disposed on the rear side of the space S in which the air discharge port 32B is disposed. For this reason, when water is injected from the rear of the vehicle at the time of washing the vehicle, the back panel 107 can prevent the water from entering the air discharge port 32B of the exhaust duct 32. As a result, water can be prevented from entering the battery pack 2 through the exhaust duct 32, and corrosion or rust is generated at a connection portion (for example, a bus bar using a metal material) used in the battery pack 2. Can be prevented. Therefore, in this exhaust apparatus 1, it can suppress that battery performance falls.

  In the present embodiment, since the air discharge port 32B of the exhaust duct 32 is disposed on the opposite side of the exhaust pipe 112 with respect to the air introduction port 32A, the air discharge port 32B can be kept away from the exhaust pipe 112 in the vehicle width direction. . This suppresses the exhaust gas exhausted from the exhaust pipe 112 from entering the air outlet 32B of the exhaust duct 32 even when the cooling fan is temporarily stopped when the vehicle is running or when the vehicle is temporarily stopped. it can. Further, in the present embodiment, since the air inlet 32A and the air outlet 32B of the exhaust duct 32 are arranged so as not to overlap in the vehicle front-rear direction, moisture (liquid) such as water is received during car washing. Even if it enters the air discharge port 32B of the exhaust duct 32, it is possible to prevent water (water, liquid) from reaching the air introduction port 32A. Therefore, in the exhaust device 1, the performance of the battery can be ensured.

  In the present embodiment, the air discharge port 32B passes through the lower side of the vertical wall portion 108B extending downward from the rear opening edge portion 108A of the opening 108 of the rear floor panel 104 to the vehicle lower side in the vehicle front-rear direction than the vertical wall portion 108B. Is open. Therefore, in the exhaust device 1, the vertical wall portion 108 </ b> B can restrict the air exhausted from the exhaust duct 32 from flowing into the vehicle interior or the space between the cover panel 109 and the battery pack 2 from the space S. As a result, the air discharged from the air discharge port 32 </ b> B into the space S again flows into the vehicle interior or the space between the cover panel 109 and the battery pack 2 and flows into the suction port 25 of the battery pack 2. Can be prevented. Therefore, in the exhaust device 1, the cooling performance of the battery can be improved.

  In the present embodiment, air discharge port 32 </ b> B is arranged on the end side of battery pack 2 in the vehicle width direction, which is far from exhaust pipe 112. Thus, the air discharge port 32B can be farthest from the exhaust pipe 112 in the vehicle width direction within a range in which the air discharge port 32B does not protrude from the battery pack 2 in the vehicle width direction. As a result, the exhaust gas discharged from the exhaust pipe 112 can be prevented from flowing into the exhaust opening 24 of the battery pack 2. Further, when the vehicle travels, the traveling wind flows from the front of the vehicle toward the rear along the side surface of the battery pack 2 in the vehicle width direction along the lower side of the vehicle 100. Since the air discharge port 32B is disposed within a range that does not protrude from the battery pack 2 in the vehicle width direction, the end of the air discharge port 32B in the vehicle width direction is used as the flow of the travel wind without disturbing the flow of the travel wind. Can be along. For this reason, according to this structure, the air in the air discharge port 32B can be discharged to the vehicle rear by the momentum of the traveling wind. In other words, according to this structure, it is possible to generate a negative pressure that pulls the air in the exhaust duct 32 outward at the air discharge port 32B by the traveling wind. As a result, the exhaust gas can be prevented from flowing into the vicinity of the air discharge port 32B in the exhaust duct 32.

[Modification]
6 and 7 show a modification of the exhaust device 1 of the battery pack 2 according to the present embodiment. As shown in FIG. 7, in this modification, the bottom surface portion 32C of the exhaust duct 32 is set so as to be gradually inclined downward from the air introduction port 32A toward the air discharge port 32B. Further, the vicinity of the air discharge port 32B is inclined obliquely downward rearward in the vehicle front-rear direction, and is set so that the air discharge port 32B is lowest. For this reason, even if moisture such as moisture or moisture contained in the exhaust gas enters the exhaust duct 32, moisture (indicated by arrows) W such as moisture or moisture in the exhaust gas is removed from the bottom surface of the exhaust duct 32. It can flow to the downstream side by its own weight along the part 32C (inclined surface). Therefore, in this modification, moisture W such as moisture and moisture contained in the exhaust gas does not accumulate in the exhaust duct 32 on the bottom surface portion 32C of the exhaust duct 32. Therefore, in this modified example, there is no possibility that the moisture and the water accumulated in the exhaust duct 32 will be splashed up due to the vibration of the vehicle and the like, and the moisture will flow into the air inlet 32A due to that momentum.

(Other embodiments)
Although the embodiment has been described above, it should not be understood that the description and the drawings constituting a part of the disclosure of the embodiment limit the present invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

  For example, in the above-described embodiment, the vertical wall portion 108B extending downward is provided on the rear opening edge portion 108A of the opening portion 108, but a configuration without this vertical wall portion 108B is also within the scope of the present invention. Needless to say.

DESCRIPTION OF SYMBOLS 1 Exhaust device 2 Battery pack 2R Rear part 21 Case 21A Case upper part 21B Case lower part 22 Battery 24 Exhaust opening part 25 Inlet 31 Cooling fan 32 Exhaust duct 32A Air inlet 32B Air discharge port 32C Bottom part 100 Vehicle 101 Vehicle rear part 102 Rear seat 103 Rear side member 103A Rear end portion 104 Rear floor panel 106 Rear bumper 107 Back panel 108 Opening portion 108A Rear opening edge portion 108B Vertical wall portion 111 Engine 112 Exhaust pipe

Claims (4)

A pair of left and right side members are provided below the rear floor panel on the rear side in the vehicle longitudinal direction from the rear seat, and a back panel extending downward from the rear floor panel is provided at the rear end of the side member. An exhaust pipe is arranged so as to extend rearward in the vehicle front-rear direction through the lower part of the panel, and an exhaust gas discharge port at the downstream end of the exhaust pipe is unevenly arranged on one side in the vehicle width direction at the rear of the vehicle An exhaust duct that discharges the air flowing inside the battery pack to the outside is provided on the rear surface of the rear side in the vehicle front-rear direction of the battery pack that houses the battery that generates a high voltage. In an exhaust device for a vehicle battery pack,
An opening is formed in the rear floor panel;
The battery pack is disposed on the other side in the vehicle width direction from the exhaust gas discharge port, and the upper part of the battery pack is disposed so as to protrude upward through the opening,
The air inlet of the exhaust duct is disposed at a position protruding on one side in the vehicle width direction of the battery pack and above the rear floor panel,
An air discharge port of the exhaust duct is disposed on the other side in the vehicle width direction opposite to the exhaust pipe with respect to the air introduction port, and the air discharge port is in a space surrounded by the rear floor panel and the back panel. An exhaust device for a vehicle battery pack, wherein   A vertical wall portion is formed at the rear opening edge of the opening on the rear side in the vehicle front-rear direction so as to extend toward the vehicle lower side, and the exhaust duct passes through the lower side of the vertical wall portion to pass the air discharge port. The exhaust device for a vehicle battery pack according to claim 1, wherein the exhaust device is disposed on the rear side in the vehicle front-rear direction with respect to the vertical wall portion.   The exhaust device for a vehicle battery pack according to claim 1 or 2, wherein a bottom surface portion of the exhaust duct is gradually inclined downward from the air introduction port toward the air discharge port. .   The said air discharge port is arrange | positioned at the edge part far from the said exhaust pipe among the edge parts of the vehicle width direction of the said back panel, The Claim 1 characterized by the above-mentioned. Vehicle battery pack exhaust system.

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