Vehicle battery cooling structure

Abstract

The battery cooling structure of the vehicle includes: a battery case supported by the vehicle body and housing the battery and the DC-DC converter; an air intake portion for introducing air into the battery case; and an exhaust portion for exhausting the air introduced into the battery case. In the battery case, the battery is arranged on the upstream side of the air flow path from the air intake portion to the exhaust portion. The DC-DC converter is arranged on the downstream side.

Description

Technical Field

[0001] The invention relates to a battery cooling structure of a vehicle. Background Art

[0002] Patent Document 1 discloses a vehicle including a belt starter generator (BSG) or belt starter generator.

[0003] The belt-type starter generator functions as an auxiliary power source that starts the engine and assists the output of the engine during traveling.

[0004] In many cases, vehicles equipped with a belt-type starter generator are equipped with a battery with an output voltage of 48V and a DC / DC converter. The 48V battery drives the starter generator. In order to obtain a 12V voltage to drive various electrical appliances, the DC / DC converter converts the battery output voltage from 48V to 12V.

[0005] If the battery and the DC / DC converter generate heat and become high in temperature during operation, it is disadvantageous for them to exert their performance. Therefore, the battery and the DC / DC converter need to be cooled appropriately.

[0006] However, if independent cooling structures are provided for the battery and the DC / DC converter, the cooling structure becomes complicated, and there is room for improvement in terms of miniaturization of the cooling structure.

[0007] Prior art literature

[0008] Patent Literature

[0009] Patent Document 1: Japanese Patent Application Publication No. 2012-241700 Summary of the invention

[0010] The present invention relates to a battery cooling structure for a vehicle which can simplify the cooling structure and reduce the size.

[0011] According to a typical embodiment, a battery cooling structure of a vehicle comprises: a battery housing supported by a vehicle body and housing a battery and a DC-DC converter; an air intake portion for introducing air into the battery housing; and an exhaust portion for exhausting the air introduced into the battery housing. In the battery housing, the battery is arranged on the upstream side of the air flow path from the air intake portion to the exhaust portion. The DC-DC converter is arranged on the downstream side.

[0012] According to this configuration, the battery is first cooled by the cooling air flowing from the air intake portion to the air exhaust portion through the air flow path in the battery case, and then the DC-DC converter having a higher temperature than the battery is cooled by the cooling air heated by the battery.

[0013] Therefore, even if two components, a battery and a DC / DC converter, which generate heat, are housed in the same battery case, both the battery and the DC / DC converter can be cooled efficiently.

[0014] Therefore, compared with the case where independent cooling structures are provided for both the battery and the DC / DC converter, the cooling structure can be simplified and reduced in size. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a perspective view showing the battery cooling structure of the vehicle according to the embodiment, and shows a state in which the cover of the battery case is removed.

[0016] Figure 2 It is a plan view showing the battery cooling structure of the vehicle according to the embodiment, and shows a state in which the cover of the battery case is removed.

[0017] Figure 3 yes Figure 1 AA line section view.

[0018] Figure 4 yes Figure 1 BB line cross-sectional view.

[0019] Figure 5 yes Figure 1 CC line section view.

[0020] Figure 6 It is a three-dimensional diagram showing a battery.

[0021] Figure 7 It is a cross-sectional view showing a state where the end portion of the second exhaust pipe is arranged inside the side member. DETAILED DESCRIPTION

[0022] Hereinafter, embodiments will be described with reference to the drawings.

[0023] In the following drawings, the symbol UP indicates the upper side of the vehicle, the symbol FR indicates the front side of the vehicle, and the symbol LH indicates the vehicle width direction.

[0024] In the embodiment, the present invention is applied to a vehicle having a belt-type starter generator, but the present invention is not limited to vehicles having a belt-type starter generator and can be widely applied to vehicles having a battery and a DC / DC converter that converts the output voltage of the battery.

[0025] like Figure 1 , Figure 2 , Figure 3As shown, a pair of side beams 12 are provided at the rear of the vehicle body 10 . The side beams 12 are spaced apart in the vehicle width direction and extend in the vehicle front-rear direction. A rear floor panel 14 is provided between the side beams 12 .

[0026] A recessed portion 16 is provided at the center of the rear floor panel 14 in the vehicle width direction. The recessed portion 16 is open upward and has a rectangular shape in a plan view.

[0027] The recessed portion 16 is generally used as a storage portion for storing a spare tire, tools, etc., but is used as a storage portion for storing a battery pack 20 in the present embodiment.

[0028] A flat luggage room panel 18 (see Figure 3 ), the luggage room panel 18 covers the rear floor panel 14 including the recessed portion 16. Cargo can be stored on the luggage room panel 18.

[0029] The battery cooling structure for the vehicle according to the embodiment includes a battery pack 20 , an air intake portion 22 , and an exhaust portion 24 .

[0030] The battery pack 20 includes a battery case 26 , a battery 28 , and a DC / DC converter 30 .

[0031] like Figures 3 to 5 As shown, the battery housing 26 is provided in the luggage compartment. The battery housing 26 includes a tray 32 and a cover 34. Figure 1 In the figure, the tray 32 and the cover 34 are omitted for convenience of explanation.

[0032] The tray 32 comprises: a tray bottom wall 3202 which is in the shape of an elongated rectangle; a tray side wall 3204 which stands up from the periphery of the tray bottom wall 3202; a tray flange 3206 which is arranged on the outer periphery of the upper end of the tray side wall 3204; and a plurality of mounting pieces 3208 which are arranged at intervals in the extension direction of the tray flange 3206.

[0033] The length of the tray 32 in the vehicle width direction is greater than the length of the tray 32 in the vehicle front-rear direction. The outer periphery of the tray 32 is mounted to the rear floor 14 via a plurality of mounting pieces 3208 or mounted to the recess 16 via the mounting pieces 3208 and the bracket 35, thereby supporting the tray 32 on the vehicle body 10.

[0034] The cover 34 comprises: a cover upper wall 3402, the shape of which corresponds to the tray bottom wall 3202; a cover side wall 3404, which is suspended from the periphery of the cover upper wall 3402; and a cover flange 3406, which is arranged on the outer periphery of the lower end of the cover side wall 3404 and cooperates with the tray flange 3206.

[0035] The cover flange 3406 overlaps with the tray flange 3206 from above. The tray flange 3206 and the cover flange 3406 are bolted to each other at a plurality of locations spaced apart in the circumferential direction. Thus, the interior of the battery case 26 is sealed.

[0036] In addition, in this embodiment, if Figure 5 As shown, a notch 3410 for an air intake pipe for inserting an air intake pipe 52 described later is formed on one of the hood side walls 3404 located in the vehicle width direction.

[0037] In addition, the hood side walls 3404 located at the rear of the vehicle are formed at intervals in the vehicle width direction. Figure 5 The first exhaust pipe notch 3412 for arranging the first exhaust pipe 42 described later and the Figure 3 The second exhaust pipe notch 3414 is shown for arranging the second exhaust pipe 44 described later.

[0038] like Figure 6 As shown, the battery 28 includes a battery body 36 and a battery cover 38 .

[0039] The output voltage of the battery main body 36 is 48 V. The battery main body 36 supplies the output voltage to a belt-type starter generator.

[0040] As the battery main body 36 , various secondary batteries such as a lithium ion secondary battery can be used.

[0041] Depending on the conditions during use, the temperature of the battery main body 36 may rise to about 60° C. during operation. Therefore, it is desirable to cool the battery main body 36 so that the battery main body 36 reaches a temperature of about 25° C. at which the battery main body 36 can exert its performance.

[0042] The battery body 36 has an elongated rectangular plate shape. A safety valve is provided on the upper surface of the battery body 36 to allow gas generated inside the battery body 36 to escape.

[0043] like Figure 3 , Figure 5 As shown, in the state covered by the battery cover 38, the length of the battery body 36 in the vehicle width direction is longer than the length of the battery body 36 in the vehicle front-rear direction. The battery body 36 is mounted to a portion of the tray bottom wall 3202 close to one side in the vehicle width direction via a bracket 40, and the bracket 40 is provided on the tray bottom wall 3202 and also serves to reinforce the tray bottom wall 3202.

[0044] When the battery body 36 is mounted on the tray bottom wall 3202 via the bracket 40, the seventh flow path 46G is formed to extend linearly in the vehicle width direction between the bottom surface 3602 of the battery body 36 and the tray bottom wall 3202. Air in the vehicle cabin flows through the seventh flow path 46G as cooling air.

[0045] like Figure 6 As shown, the battery cover 38 covers the upper surface and the side surfaces of the battery body 36. The lower portion of the battery cover 38 is open.

[0046] The battery cover 38 covers the battery body 36 from above, and is attached to the battery body 36 by an attachment member (not shown).

[0047] A strip-shaped sealing member (not shown) is installed over the entire circumference of the inner surface of the side surface of the battery cover 38 covering the side surface of the battery body 36. The sealing member seals the space between the lower surface of the battery cover 38 and the upper surface of the battery body 36 and the space between the side surface of the battery cover 38 and the side surface of the battery body 36.

[0048] One end of the second exhaust pipe 44 is connected to the side surface of the battery cover 38, which is located at the rear of the vehicle. The other end of the second exhaust pipe 44 is connected to the side surface of the battery cover 38, which is located at the rear of the vehicle. Figure 3 ) is exported to the outer rear of the battery housing 26.

[0049] like Figure 7 As shown, the other end of the second exhaust pipe 44 is connected to the inside of the side beam 12 located on one side of the vehicle width direction through the opening of the rear floor 14 on the side beam 12. As a result, the inside of the battery cover 38 and the inside of the side beam 12 are connected through the second exhaust pipe 44.

[0050] The lock ring 48 seals between the outer periphery of the second exhaust pipe 44 and the opening of the rear floor panel 14 .

[0051] Therefore, when gas is released from the safety valve of the battery body 36, the gas does not leak to the outside of the battery cover 38, in other words, does not leak into the vehicle, but is guided to the inside of the side beam 12 through the second exhaust pipe 44, and is released from the inside of the side beam 12 through the gap into the atmosphere outside the vehicle.

[0052] The DC / DC converter 30 converts the voltage output from the battery 28 from 48 V to 12 V, and supplies the voltage to various electrical appliances.

[0053] Depending on the conditions of use, the temperature of the DC / DC converter 30 may reach about 100°C during operation, which is higher than the temperature of the battery body 36. Therefore, it is desirable to cool the DC / DC converter 30 to a temperature of about 60°C, for example, at which the performance of the DC / DC converter 30 can be exerted.

[0054] like Figure 1 , Figure 2 , Figure 4 , Figure 5 As shown, the DC / DC converter 30 has a rectangular plate shape that is thinner than the battery 28 .

[0055] The DC / DC converter 30 and the battery 28 are disposed adjacent to each other with a gap therebetween in the vehicle width direction. One side of the rectangular shape of the battery 28 is parallel to one side of the rectangular shape of the DC / DC converter 30 .

[0056] like Figure 4 As shown, the DC / DC converter 30 is mounted to a portion of the tray bottom wall 3202 close to the other side in the vehicle width direction via a bracket 50 . The bracket 50 is provided on the tray bottom wall 3202 and also serves to reinforce the tray bottom wall 3202 .

[0057] In a state where the DC / DC converter 30 is mounted on the tray bottom wall 3202 via the bracket 50, the eighth flow path 46H through which the cooling air flows is formed to extend in the vehicle width direction on the same straight line as the seventh flow path 46G between the bottom surface 3002 of the DC / DC converter 30 and the tray bottom wall 3202. The bottom surface 3602 of the battery 28 and the bottom surface 3002 of the DC / DC converter 30 are cooled more effectively by the cooling air via the seventh flow path 46G and the eighth flow path 46H.

[0058] A heat sink or heat sink pins for promoting cooling may be arbitrarily provided on the upper surface 3004 of the DC / DC converter 30 .

[0059] Therefore, if Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown, when the cover 34 is installed on the tray 32, a first flow path 46A, a second flow path 46B, a third flow path 46C, a fourth flow path 46D and a ninth flow path 46I for cooling air to flow are formed between the tray bottom wall 3202 and the cover upper wall 3402 respectively.

[0060] The first flow path 46A extends in the front-rear direction of the vehicle between the tray side wall 3204 and the cover side wall 3404 and the side 2802 of the battery 28. The tray side wall 3204 and the cover side wall 3404 are located on one side in the vehicle width direction, and the side 2802 of the battery 28 is opposite to the tray side wall 3204 and the cover side wall 3404.

[0061] The second flow path 46B extends in the vehicle width direction between the tray side wall 3204 and the cover side wall 3404, which are located in the front of the vehicle, and the side 2802 of the battery 28 and the side 3006 of the DC / DC converter 30, which are opposite to the tray side wall 3204 and the cover side wall 3404. The second flow path 46B is connected to the vehicle front portion of the first flow path 46A.

[0062] The third flow path 46C extends in the vehicle width direction between the tray side wall 3204 and the cover side wall 3404, which are located at the rear of the vehicle, and the side 2802 of the battery 28 and the side 3006 of the DC / DC converter 30, which are opposite to the tray side wall 3204 and the cover side wall 3404. The third flow path 46C is connected to the rear portion of the first flow path 46A.

[0063] The fourth flow path 46D extends in the vehicle longitudinal direction between the side surface 2802 of the battery 28 and the side surface 3006 of the DC / DC converter 30 which face each other in the vehicle width direction. The fourth flow path 46D communicates with the middle portion of the second flow path 46B and the third flow path 46C.

[0064] The ninth flow path 46I extends in the vehicle front-rear direction between the tray side wall 3204 and the cover side wall 3404, and the side surface 3006 of the DC / DC converter 30, the tray side wall 3204 and the cover side wall 3404 being located on the other side in the vehicle width direction, and the side surface 3006 of the DC / DC converter 30 being opposed to the tray side wall 3204 and the cover side wall 3404. The ninth flow path 46I communicates with the ends of the second flow path 46B and the third flow path 46C.

[0065] like Figure 3 , Figure 5 As shown, a fifth flow path 46E through which cooling air flows is formed between the upper surface 2804 of the battery 28 and the cover upper wall 3402. The fifth flow path 46E communicates with the upper portion of the first flow path 46A and extends in the vehicle width direction.

[0066] like Figure 4 , Figure 5 As shown, a sixth flow path 46F for cooling air to flow is formed between the upper surface 3004 of the DC / DC converter 30 and the cover upper wall 3402. The sixth flow path 46F communicates with the upper portions of the fifth flow path 46E and the fourth flow path 46D and extends in the vehicle width direction.

[0067] like Figure 3 , Figure 5As shown, a seventh flow path 46G for cooling air to flow is formed between the bottom surface 3602 of the battery 28 (battery body 36) and the tray bottom wall 3202. The seventh flow path 46G communicates with the lower portion of the first flow path 46A and extends in the vehicle width direction.

[0068] like Figure 4 , Figure 5 As shown, an eighth flow path 46H for cooling air to flow is formed between the bottom surface 3002 of the DC / DC converter 30 and the tray bottom wall 3202. The eighth flow path 46H communicates with the lower portions of the seventh flow path 46G and the fourth flow path 46D and extends in the vehicle width direction.

[0069] The air intake portion 22 introduces air in the vehicle interior into the battery case 26 .

[0070] The air in the vehicle cabin is usually brought to a comfortable temperature for the passengers by introducing outside air or using an air conditioner.

[0071] like Figure 1 , Figure 2 , Figure 5 As shown, the air intake portion 22 includes an air intake pipe 52 .

[0072] In the present embodiment, the air intake duct 52 is disposed on one side of the battery case 26 in the vehicle width direction.

[0073] An air intake opening 5202 for sucking in air in the vehicle cabin is provided at one end in the longitudinal direction of the air intake duct 52. An air blow-out opening 5204 for supplying air sucked in through the air intake opening 5202 into the battery case 26 is provided at the other end in the longitudinal direction of the air intake duct 52.

[0074] The intake air intake opening 5202 is located at a position close to one side in the vehicle width direction in the vehicle interior and at a position away from the rear floor panel 14 in an upward direction.

[0075] The air intake opening 5204 is disposed inside the battery case 26 via the air intake duct notch 3410 of the cover 34 of the battery case 26. Figure 2 , Figure 5 As shown, the intake air blowing opening 5204 faces the side surface 2802 of the battery 28 in the arrangement direction of the battery 28 and the DC-DC converter 30 .

[0076] The exhaust portion 24 exhausts the air introduced into the battery case 26 .

[0077] like Figure 2 , Figure 4 , Figure 5 As shown, the exhaust portion 24 includes a first exhaust duct 42 and a fan 54 .

[0078] The first exhaust pipe 42 is provided to protrude from the battery case 26 toward the oblique rear of the vehicle via the first exhaust pipe notch 3412 of the cover 34 .

[0079] An exhaust gas introduction opening 4202 is provided at one end of the first exhaust pipe 42 in the extending direction. An exhaust gas discharge opening 4204 is provided at the other end of the first exhaust pipe 42 in the extending direction.

[0080] The exhaust gas introduction opening 4202 is disposed in a portion of the battery case 26 close to the rear of the vehicle and between the battery 28 and the DC-DC converter 30 close to the DC-DC converter 30. Figure 5 As shown, the exhaust gas introduction opening 4202 extends from between the battery 28 and the DC-DC converter 30 to the middle portion of the DC-DC converter 30 in the vehicle width direction at a position above the DC-DC converter 30 when viewed from the front.

[0081] In addition, if Figure 2 As shown, the exhaust gas introduction opening 4202 faces substantially the center of the upper surface 3004 of the DC / DC converter 30. Therefore, in the wall portion constituting the first exhaust pipe 42, a portion 4210 of the exhaust gas introduction opening 4202 on the battery 28 side protrudes from the cover side wall 3404 into the battery case 26 by a greater protrusion amount than a portion 4212 of the exhaust gas introduction opening 4202 on the DC / DC converter 30 side.

[0082] In other words, the exhaust gas introduction opening 4202 faces the DC-DC converter 30 in the vicinity of the DC-DC converter 30 .

[0083] In addition, the exhaust gas introduction opening 4202 is arranged between the battery 28 and the DC-DC converter 30 so as to be close to the DC-DC converter 30. That is, the shortest distance from the center 4202C of the exhaust gas introduction opening 4202 to the DC-DC converter 30 is shorter than the shortest distance from the center 4202C of the exhaust gas introduction opening 4202 to the battery 28. In the width direction of the exhaust gas introduction opening 4202, the first portion P1 located on the battery 28 side protrudes further into the battery case 26 than the second portion P2 located on the opposite side of the first portion P1 in the width direction and on the DC-DC converter 30 side.

[0084] The exhaust gas discharge opening 4204 opens below the luggage compartment panel 18 outside the battery case 26. In other words, the exhaust gas discharge opening 4204 opens in the space between the rear floor panel 14 and the luggage compartment panel 18 covering the rear floor panel 14. Figure 2As shown, in a plan view, the exhaust gas discharge opening 4204 opens in three directions: the rear of the vehicle, diagonally rearward of the vehicle in one direction in the vehicle width direction, and in the other direction in the vehicle width direction.

[0085] The fan 54 is provided outside the battery case 26 near the first exhaust pipe 42 (exhaust gas discharge opening 4204 ) and draws air inside the battery case 26 from the exhaust gas introduction opening 4202 toward the exhaust gas discharge opening 4204 .

[0086] The first exhaust duct 42 and the fan 54 are located at the vehicle rear portion of the DC-DC converter 30. More specifically, the first exhaust duct 42 and the fan 54 are located at the vehicle rear portion of the DC-DC converter 30 and within the projection area of ​​the DC-DC converter 30. That is, when viewed from above, the fan 54 is smaller in the top view (corresponding to the side portion of the DC-DC converter 30 located at the most central side in the vehicle width direction). Figure 2 ) is located at the outside in the vehicle width direction. That is, the first exhaust duct 42 and the fan 54 are provided at a position offset from the battery 28 in the vehicle width direction. In other words, the first exhaust duct 42 and the fan 54 are not provided in the projection area of ​​the battery 28 behind the battery 28. In addition, the "projection area" mentioned here refers to an imaginary area formed when the DC-DC converter 30 or the battery 28 is moved backward without being offset in the vehicle width direction.

[0087] By arranging the battery 28, the DC / DC converter 30, the air intake section 22, and the exhaust section 24 inside the battery case 26 in this manner, the battery is disposed on the upstream side of the air flow path from the air intake section 22 to the exhaust section 24 inside the battery case 26, and the converter 30 is disposed on the downstream side.

[0088] like Figure 2 As shown, when the fan 54 is operated while the battery 28 and the DC / DC converter 30 are in operation, the cooling air introduced from the air intake opening 5202 of the air intake duct 52 is guided into the battery case 26 from the air intake blowing opening 5204 .

[0089] The cooling air blown out from the intake air blowing opening 5204 hits the side surface 2802 of the battery 28, and a portion of it flows from the middle portion in the length direction of the first flow path 46A to the front and rear of the vehicle. The cooling air flowing from the middle portion in the length direction of the first flow path 46A to the front and rear of the vehicle passes through the second flow path 46B and the third flow path 46C, flows to the other side in the vehicle width direction, and reaches the ninth flow path 46I.

[0090] In addition, a portion of the cooling air blown out from the air intake opening 5204 and colliding with the side 2802 of the battery 28 passes through the fifth flow path 46E on the upper surface 2804 of the battery 28, the fourth flow path 46D, and the sixth flow path 46F on the upper surface 3004 of the DC / DC converter 30, flows to the other side in the vehicle width direction, and reaches the ninth flow path 46I.

[0091] In addition, if Figure 5 As shown, a portion of the cooling air blown out from the air intake opening 5204 and colliding with the side surface 2802 of the battery 28 passes through the seventh flow path 46G, the fourth flow path 46D, and the eighth flow path 46H of the bottom surface 3602 of the battery 28 (battery body 36), and the bottom surface 3002 of the DC / DC converter 30, flows to the other side in the vehicle width direction, and reaches the ninth flow path 46I.

[0092] Then, the cooling air reaching the ninth flow path 46I passes through the upper surface 3004 of the DC / DC converter 30, is sucked in from the exhaust inlet opening 4202 by the fan 54, and is discharged to the bottom of the luggage room panel 18, that is, the space between the rear floor panel 14 and the luggage room panel 18 through the exhaust discharge opening 4204.

[0093] In the present embodiment, the battery 28 is disposed on the upstream side of the flow path of air from the air intake section 22 to the air exhaust section 24 in the battery case 26, and the DC-DC converter 30 is disposed on the downstream side. Therefore, the battery 28 is first cooled by the cooling air that reaches the air exhaust section 24 from the air intake section 22 via the first flow path 46A to the ninth flow path 46I in the battery case 26. Then, the DC-DC converter 30, which is hotter than the battery 28, is cooled by the cooling air heated by the battery 28.

[0094] Therefore, even if both the battery 28 and the DC / DC converter 30 that generate heat are housed in the same battery case 26 , both the battery 28 and the DC / DC converter 30 can be cooled efficiently.

[0095] Therefore, compared with the case where independent cooling structures are provided for both the battery 28 and the DC / DC converter 30 , the cooling structure can be simplified, which is advantageous in achieving miniaturization and cost reduction.

[0096] Furthermore, the exhaust gas introduction opening 4202 is provided in the vicinity of the DC-DC converter 30 so as to face the DC-DC converter 30 .

[0097] Therefore, the cooling air whose temperature has risen through the battery 28 and the DC / DC converter 30 can be preferentially drawn into the exhaust gas introduction opening 4202 , which is advantageous in improving the cooling efficiency of the battery 28 and the DC / DC converter 30 .

[0098] In addition, if Figure 2 , Figure 5 As shown, in a portion inside the battery housing 26 near the rear of the vehicle, when viewed from the front, the exhaust inlet opening 4202 extends from between the battery 28 and the DC-DC converter 30 above the DC-DC converter 30 to the middle portion of the DC-DC converter 30 in the vehicle width direction.

[0099] Therefore, the cooling air whose temperature has risen through the battery 28 and the DC / DC converter 30 can be preferentially drawn into the exhaust gas introduction opening 4202 , which is advantageous in improving the cooling efficiency of the battery 28 and the DC / DC converter 30 .

[0100] In addition, the exhaust gas introduction opening 4202 is arranged between the battery 28 and the DC-DC converter 30 and close to the DC-DC converter 30, and in the width direction of the exhaust gas introduction opening 4202, the first portion P1 located on the battery 28 side protrudes further into the battery case 26 than the second portion P2 located on the DC-DC converter 30 side. Therefore, since the cooling air flowing in the third flow path 46C and the fifth flow path 46E collides with the portion of the exhaust gas introduction opening 4202 on the battery 28 side, it is not directly attracted to the exhaust gas introduction opening 4202. Therefore, the cooling air flowing in the third flow path 46C and the fifth flow path 46E can be effectively used as cooling air for cooling the battery 28 and the DC / DC converter 30, which is more advantageous in improving the cooling efficiency of the battery 28 and the DC / DC converter 30.

[0101] In addition, in the present embodiment, the exhaust gas discharge opening 4204 of the first exhaust pipe 42 opens in the space between the rear floor panel 14 and the luggage room panel 18. Therefore, the cooling air whose temperature rises due to cooling the battery 28 and the DC / DC converter 30 is not discharged directly into the vehicle interior, but can be discharged indirectly into the vehicle interior, which is advantageous in maintaining the comfort of the passengers.

[0102] In addition, in the present embodiment, the exhaust unit 24 includes a fan 54 interposed in the first exhaust duct 42. Therefore, the cooling air which has reached a high temperature due to cooling the battery 28 and the DC / DC converter 30 can be discharged preferentially, which is advantageous in improving the cooling efficiency of the battery 28 and the DC / DC converter 30.

[0103] In addition, although the fan 54 may be provided in the intake duct 52 , it is more advantageous to improve the cooling efficiency of the battery 28 and the DC / DC converter 30 as in the present embodiment.

[0104] In addition, in the present embodiment, the battery 28 and the DC-DC converter 30 are arranged in the vehicle width direction. In addition, the air intake opening 5202 of the air intake duct 52 of the air intake unit 22 is located in the vehicle interior. Furthermore, the air intake blowing opening 5204 of the air intake duct 52 of the air intake unit 22 faces the battery 28 in the arrangement direction of the battery 28 and the DC-DC converter 30.

[0105] Therefore, the cooling air can be directed directly from the intake air blowing opening 5204 toward the battery 28 and contact the battery 28 , which is advantageous in improving the cooling efficiency of the battery 28 .

[0106] In addition, the first exhaust duct 42 and the fan 54 are located behind the DC-DC converter 30 and within the projection area of ​​the DC-DC converter 30. Therefore, when the vehicle is rear-ended, the first exhaust duct 42 and the fan 54 do not interfere with the battery 28, which is advantageous in protecting the battery 28.

[0107] In addition, the present embodiment includes a second exhaust duct 44 that exhausts exhaust gas from the battery 28 into the side sill 12. Therefore, even if cooling air that cools the battery 28 is exhausted into the vehicle interior, gas generated from the battery 28 can be exhausted to the outside of the vehicle interior.

[0108] In the present embodiment, the second exhaust pipe 44 discharges the exhaust gas from the battery 28 into the side member 12 . However, the second exhaust pipe 44 may discharge the exhaust gas from the battery 28 to the outside of the vehicle. In this case, the same effects as above can be obtained.

[0109] However, as in the present embodiment, since the gas generated from the battery 28 is exhausted into the side member 12 which is a non-airtight closed space, it is advantageous in preventing water and insects from intruding into the second exhaust pipe 44 .

[0110] This application is based on Japanese patent application No. 2019-013880 filed on January 30, 2019, the contents of which are incorporated herein by reference.

[0111] Explanation of symbols

[0112] 10 Body

[0113] 12 Side beam

[0114] 14 Rear bottom plate

[0115] 18 Luggage compartment panel

[0116] 22 Air intake

[0117] 24 Exhaust

[0118] 26 Battery housing

[0119] 28 Batteries

[0120] 30 DC / DC Converter

[0121] 42 First exhaust pipe

[0122] 4202 Exhaust inlet opening

[0123] 4204 Exhaust discharge opening

[0124] 4210, 4212 Wall parts

[0125] 44 Second exhaust pipe

[0126] 46A~46I First to ninth flow paths

[0127] 52 Intake pipe

[0128] 5202 Air intake opening

[0129] 5204 Air intake and outlet opening

[0130] 54 Fan

[0131] P1 Part 1

[0132] P2 Part 2

Claims

1. A battery cooling structure for a vehicle, characterized in that: have: a battery case supported by the vehicle body and accommodating a battery and a DC-DC converter; an air intake portion, which introduces air into the battery housing; as well as an exhaust portion for exhausting the air introduced into the battery case, The battery cooling structure of the vehicle is configured such that, in the battery case, the battery is arranged on the upstream side of the flow path of air from the air intake portion to the air exhaust portion, and the DC-DC converter is arranged on the downstream side. The exhaust portion includes a first exhaust pipe protruding from the battery case, The exhaust gas introduction opening of the first exhaust pipe is arranged above the DC-DC converter inside the battery case. The exhaust gas introduction opening has a first portion and a second portion, wherein the first portion is located on the battery side in the width direction of the exhaust gas introduction opening, and the second portion is located on the opposite side of the first portion in the width direction and on the DC-DC converter side. When the battery case is viewed from above, the first portion protrudes further into the battery case than the second portion.

2. The battery cooling structure of a vehicle according to claim 1, characterized in that: The exhaust gas introduction opening of the first exhaust pipe is configured to face the DC-DC converter in the vicinity of the DC-DC converter.

3. The battery cooling structure of a vehicle according to claim 2, characterized in that: The shortest distance from the center of the exhaust gas introduction opening to the DC-DC converter is shorter than the shortest distance from the center of the exhaust gas introduction opening to the battery.

4. The battery cooling structure of a vehicle according to any one of claims 1 to 3, characterized in that: The exhaust unit includes a fan interposed in the first exhaust duct.

5. The battery cooling structure for a vehicle according to claim 4, characterized in that: The fan is located behind the DC-DC converter in the vehicle, and the center of the fan is located outside in the vehicle width direction relative to the side portion of the DC-DC converter located most centrally in the vehicle width direction in a plan view.

6. The battery cooling structure for a vehicle according to claim 4, characterized in that: The first exhaust duct and the fan are not located within a projection area of ​​the battery at the rear of the vehicle.

7. The battery cooling structure for a vehicle according to any one of claims 1 to 3, characterized in that: The battery and the DC-DC converter are arranged in the vehicle width direction, The air intake portion comprises an air intake pipe, The air intake pipe has: an air intake opening provided at one end of the air intake portion and sucking air in the vehicle interior; as well as an air intake and air outlet opening, the air intake and air outlet opening being provided at the other end of the air intake portion and supplying the air into the battery case, The intake air blowing opening is arranged toward the battery.

8. The battery cooling structure for a vehicle according to any one of claims 1 to 3, characterized in that: A second exhaust pipe is further provided for discharging exhaust gas from the battery to the outside of the vehicle.

9. The battery cooling structure for a vehicle according to any one of claims 1 to 3, characterized in that: A second exhaust pipe is further provided for discharging exhaust gas from the battery into the side member.

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