Battery pack for vehicle

Abstract

Provided is a battery pack for a vehicle in which electrical devices disposed in a case are satisfactorily cooled and assemblable. A battery pack (10) is provided with: a left-side battery (12L) and a right-side battery (12R), which are disposed apart from each other; a terminal (14); a cooling mechanism (16) for cooling the batteries (12L, 12R); and a case (20) for housing the batteries (12L, 12R). The cooling mechanism (16) has: a left air intake path (40L) in which the left battery (12L) is disposed and through which cooling air flows; a right-side air intake path (40R) in which the right-side battery (12R) is disposed and through which cooling air flows; a converging pipeline (50) arranged between the left side storage battery (12L) and the right side storage battery (12R); and a cooling fan (60) connected to the converging duct (50). An inclined part (55) is arranged on the upper surface of the merging pipeline (50), and the wiring platform (14) is arranged on the inclined part (55).

Description

Technical Field

[0001] The present invention relates to a battery pack mounted on a vehicle. Background Art

[0002] In recent years, in order to ensure that more people have access to affordable, reliable, and sustainable modern energy, research and development related to secondary batteries that contribute to energy efficiency has been carried out.

[0003] As vehicle drive sources become more electrified, vehicles are equipped with batteries that supply power to motors, etc. The battery, various electrical devices connected to the battery, and a cooling mechanism for cooling the battery and the electrical devices are housed in a housing and mounted on the vehicle as a unit (for example, Patent Documents 1 and 2).

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2018-30450

[0007] Patent Document 2: Japanese Patent Application Publication No. 2013-244768 Summary of the invention

[0008] Problems to be solved by the invention

[0009] There is a demand for a battery pack in which electrical devices are arranged in a limited space within a case so that the electrical devices that generate heat can be appropriately cooled and in which the ease of assemblage of the electrical devices is improved.

[0010] The present invention provides a vehicle battery pack having good cooling and assembling properties for electrical equipment arranged in a casing.

[0011] Solutions to Solve Problems

[0012] The present invention is a vehicle battery pack, comprising:

[0013] a first storage battery and a second storage battery arranged to be separated from each other in a horizontal direction;

[0014] an electrical device electrically connected to the first storage battery and the second storage battery;

[0015] A cooling mechanism for cooling the first battery and the second battery by cooling air; and

[0016] A housing for accommodating the first storage battery, the second storage battery, the electrical device, and the cooling mechanism, wherein:

[0017] The cooling mechanism comprises:

[0018] a first air intake path, in which the first battery is disposed and through which the cooling air flows;

[0019] a second air intake path, in which the second battery is disposed and through which the cooling air flows;

[0020] a merging duct disposed between the first battery and the second battery and connected to the first intake path and the second intake path; and

[0021] a cooling fan connected to the merging duct to allow the cooling air to flow through the first air intake path, the second air intake path, and the merging duct;

[0022] An inclined portion is provided on the upper surface of the converging pipe.

[0023] The electrical device is disposed on the inclined portion.

[0024] Effects of the Invention

[0025] According to the present invention, the cooling and assemblability of the electric device arranged in the casing are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a perspective view of a battery pack 10 according to one embodiment of the present invention.

[0027] Figure 2 It is an exploded perspective view of the battery pack 10 .

[0028] Figure 3 It is a front view of each component housed in the case 20 of the battery pack 10 .

[0029] Figure 4 It is a perspective view of the merging pipeline 50.

[0030] Figure 5 2 is a diagram showing the flow of cooling air (dashed arrows) and the transfer of heat (solid arrows) within battery pack 10 .

[0031] Description of reference numerals:

[0032] 4 Floor

[0033] 9 Transmission shaft (power transmission shaft)

[0034] 10 Battery pack (vehicle battery pack)

[0035] 12L left battery (first battery)

[0036] 12R Right battery (second battery)

[0037] 14. Junction box (electrical equipment)

[0038] 14a terminal

[0039] 15 Frame parts

[0040] 16 Cooling mechanism

[0041] 19 DC line (wiring)

[0042] 20 Shell

[0043] 40L Left side intake path (first intake path)

[0044] 40R Right side intake path (second intake path)

[0045] 50 Converging pipelines

[0046] 55 Inclined part

[0047] 60 Cooling fan

[0048] 70 Insulation Materials

[0049] FP1 path

[0050] FP2 path. DETAILED DESCRIPTION

[0051] Hereinafter, a vehicle battery pack according to an embodiment of the present invention will be described based on the accompanying drawings. In addition, the accompanying drawings are viewed in the direction indicated by the accompanying drawings. In addition, in this specification, etc., in order to make the description simple and clear, the front and rear, left and right, and up and down directions are described according to the direction viewed from the driver of the vehicle. In the accompanying drawings, the front of the vehicle is represented as Fr, the rear is represented as Rr, the left is represented as L, the right is represented as R, the top is represented as U, and the bottom is represented as D.

[0052] Figure 1 The battery pack 10 shown is mounted on an electric vehicle (hereinafter also referred to as a vehicle) such as a hybrid vehicle or an electric vehicle. The vehicle is equipped with a motor generator, which is driven by the power stored in the battery pack 10. The battery pack 10 is configured to recover regenerative power from the motor generator when the vehicle is decelerating.

[0053] As described later Figure 5 As shown, the battery pack 10 is placed on the floor 4 of the vehicle. More specifically, the battery pack 10 is placed on the floor 4 at a position below a seat arranged in the vehicle compartment, for example.

[0054] like Figure 1 and Figure 2As shown, the battery pack 10 includes four batteries 12, a battery ECU (Electronic Control Unit) 13 that controls charging and discharging of the batteries 12, a junction block 14 on which wiring components for charging and discharging currents of the batteries 12 are mounted, a cooling mechanism 16 that cools the batteries 12 with cooling air, an exhaust duct 18 that exhausts the cooling air that has cooled the batteries 12 into the vehicle cabin, and a housing 20 that accommodates the batteries 12, the battery ECU 13, the junction block 14, and the cooling mechanism 16.

[0055] like Figure 5 As shown, the housing 20 is placed on the floor 4. Specifically, the housing 20 is located in the center of the left-right direction of the vehicle, and a propeller shaft 9 of the vehicle extending in the front-rear direction is arranged below the housing 20 and the floor 4. The propeller shaft 9 transmits the driving force of the engine and the motor generator as the driving source of the vehicle to the rear wheels.

[0056] return Figure 1 and Figure 2 The housing 20 includes: a housing body 22 of a bottomed container type having an opening facing upward, and a cover member 25 covering the opening of the housing body 22 .

[0057] The interior of the case body 22 constitutes a housing portion 23 for housing the battery 12, the battery ECU 13, the terminal block 14, the cooling mechanism 16, etc. The case body 22 has a recess 24 recessed upward on its lower surface, in which the transmission shaft 9 is disposed.

[0058] The cover member 25 is a plate-shaped member that closes the opening of the housing body 22. The cover member 25 is provided with a left air inlet 26L and a right air inlet 26R that are arranged at positions separated in the left-right direction, and an exhaust port 28 that is arranged at the center rear portion in the left-right direction. The left air inlet 26L and the right air inlet 26R are formed in the left grille cover 27L and the right grille cover 27R, respectively, and are air inlets for sucking cooling air in the vehicle compartment into the accommodating portion 23 of the housing body 22. The exhaust port 28 is connected to the exhaust duct 18 that is extended in the left-right direction at the rear of the cover member 25, and the cooling air that has cooled the battery 12 is discharged to the left and right in the vehicle compartment through the exhaust duct 18.

[0059] The four batteries 12 are arranged in the housing portion 23 of the case body 22, two on the right side and two on the left side. When the two batteries 12 arranged on the left side are referred to as left batteries 12L and the two batteries 12 arranged on the right side are referred to as right batteries 12R, the left batteries 12L and the right batteries 12R are arranged to be separated from each other in the left-right direction. In addition, the number of batteries 12 is not limited to four, and at least one battery 12 is provided on the left side of the case body 22 and at least one battery 12 is provided on the right side of the case body 22.

[0060] Each battery 12 has a plurality of cells 12a stacked in the front-to-back direction, and is configured as a battery module in which the stacked plurality of cells 12a are modularized. Between adjacent cells 12a, an inter-cell flow path 12b is formed along the up-down direction for the cooling air introduced from the left air inlet 26L and the right air inlet 26R to flow. The inter-cell flow path 12b is open upward and downward, and the front, rear, and left and right sides of the inter-cell flow path 12b are airtightly closed.

[0061] The battery ECU 13 is arranged in front of the right battery 12R in the housing portion 23 of the case body 22. The battery ECU 13 includes a processor, a memory, an interface, and the like.

[0062] The junction block 14 is disposed between the left battery 12L and the right battery 12R in the housing portion 23 of the case body 22. The junction block 14 is connected to the battery 12 via, for example, a bus bar (not shown).

[0063] In addition, if Figure 4 As shown, a terminal 14a for connecting a DC line 19 is provided on the right surface of the junction box 14. In the vehicle, a power control device including an inverter and a DC-DC converter is provided together with the motor generator, and the junction box 14 and the power control device are electrically connected via the DC line 19.

[0064] return Figure 1 and Figure 2 The cooling mechanism 16 includes: a left air intake path 40L, in which a left battery 12L is arranged, and cooling air sucked from the vehicle cabin flows; a right air intake path 40R, in which a right battery 12R is arranged, and cooling air sucked from the vehicle cabin flows; a merging duct 50, which is arranged between the left battery 12L and the right battery 12R and connected to the left air intake path 40L and the right air intake path 40R; and a cooling fan 60, which is connected to the merging duct 50, so that cooling air circulates in the right air intake path 40R, the left air intake path 40L and the merging duct 50.

[0065] The left air intake path 40L includes a left air intake port 26L provided in the cover member 25, a left upstream duct 41L provided along the upper surface of the left battery 12L, an inter-cell flow path 12b of the left battery 12L, and a left downstream duct 42L provided along the lower surface of the left battery 12L.

[0066] The left upstream duct 41L connects the left air intake port 26L and the inter-cell flow path 12b of the left battery 12L. The left upstream duct 41L has an opening 41a at a position corresponding to the left air intake port 26L, and guides the cooling air taken in from the left air intake port 26L to the inter-cell flow path 12b of the left battery 12L.

[0067] The left downstream duct 42L is connected to the inter-cell flow path 12b of the left battery 12L and the merging duct 50, and guides the cooling air flowing in the inter-cell flow path 12b to the merging duct 50. The left downstream duct 42L has a connecting portion 43L at its right end portion that opens upward and is connected to the merging duct 50. The connecting portion 43L is located at a position forward of the center of the left downstream duct 42L in the front-rear direction.

[0068] Similar to the left air intake path 40L, the right air intake path 40R includes a right air intake port 26R provided on the cover member 25; a right upstream duct 41R provided along the upper surface of the right battery 12R; an inter-cell flow path 12b of the right battery 12R; and a right downstream duct 42R provided along the lower surface of the right battery 12R.

[0069] The right upstream duct 41R connects the right air intake port 26R and the inter-cell flow path 12b of the right battery 12R. The right upstream duct 41R has an opening 41a at a position corresponding to the right air intake port 26R, and guides the cooling air taken in from the right air intake port 26R to the inter-cell flow path 12b of the right battery 12R.

[0070] The right downstream duct 42R is connected to the inter-cell flow path 12b of the right battery 12R and the merging duct 50, and guides the cooling air flowing in the inter-cell flow path 12b to the merging duct 50. The right downstream duct 42R has a connecting portion 43R at its left end portion that opens upward and is connected to the merging duct 50. The connecting portion 43R is located on the front side of the center of the right downstream duct 42R in the front-rear direction.

[0071] like Figure 3 and Figure 4As shown, the converging duct 50 includes: a left connecting portion 51 connected to the connecting portion 43L of the left downstream duct 42L; a right connecting portion 52 connected to the connecting portion 43R of the right downstream duct 42R; a converging portion 53 for converging the cooling air introduced from the left connecting portion 51 and the right connecting portion 52; a fan connecting portion 54 provided on the downstream side of the converging portion 53 and connected to the cooling fan 60; and an inclined portion 55 provided on the upper surface of the converging duct 50.

[0072] The left connecting portion 51 and the right connecting portion 52 have openings facing downward, and are provided at the left lower portion and the right lower portion of the merging portion 53 , respectively.

[0073] The confluence portion 53 forms a flow path extending upward and backward from the left connection portion 51 and the right connection portion 52 to the fan connection portion 54. The height H1 of the left end portion 53a of the confluence portion 53 (i.e., the length from the left connection portion 51 to the upper end of the left end portion 53a) is configured to be smaller than the height H2 of the right end portion 53b of the confluence portion 53 (i.e., the length from the right connection portion 52 to the upper end of the right end portion 53b). In other words, the upper end of the left end portion 53a of the confluence portion 53 is located below the upper end of the right end portion 53b, and is configured to be left-right asymmetric.

[0074] The fan connection portion 54 is provided at the rear of the confluence portion 53 to form a flow path directed upward. The fan connection portion 54 has an opening 54a directed upward, and the cooling fan 60 is connected to the fan bracket 65 (see FIG. Figure 2 ) is connected to the fan connection portion 54 from above.

[0075] The inclined portion 55 is provided on the upper surface of the junction portion 53. As described above, the upper end of the left end portion 53a of the junction portion 53 is located below the upper end of the right end portion 53b, so the inclined portion 55 is inclined downward from the right side to the left side. In other words, the inclined portion 55 is inclined toward the left battery 12L side in the direction in which the left battery 12L and the right battery 12R are arranged.

[0076] In the present embodiment, the junction block 14 is disposed on the inclined portion 55 provided on the upper surface of the junction duct 50 .

[0077] The junction block 14 is disposed on the upper surface of the merging duct 50, so the junction block 14 can be appropriately cooled by utilizing the merging duct 50 to receive heat from the heat-generating junction block 14. In particular, by providing the inclined portion 55 on the upper surface of the merging duct 50, i.e., the heat-receiving surface, the surface area of ​​the heat-receiving surface can be increased compared to a case where the inclined portion 55 is not provided, thereby improving the cooling efficiency of the junction block 14.

[0078] Furthermore, when cooling is performed by directly placing the junction block 14 in the flow path through which the cooling air flows, the number of pipes may increase in order to provide the flow path through the junction block 14. However, in the present embodiment, the junction block 14 is placed outside the flow path of the cooling air to cool the junction block 14. Therefore, the number of pipes can be reduced, which contributes to cost reduction and miniaturization of the battery pack 10.

[0079] Furthermore, by arranging the connection block 14 at the inclined portion 55, the tool T used for assembly can easily access the connection block 14 in the narrow space between the left battery 12L and the right battery 12R. Therefore, the connection block 14 can be assembled more easily than when it is arranged horizontally.

[0080] When the assembly of the terminal block 14 is described in more detail, the terminal 14a is provided on the higher side of the inclined portion 55, i.e., the right side, and when the DC line 19 is fixed to the terminal 14a by a fastening member, a working space for the tool T can be ensured above the right battery 12R.

[0081] The connection board 14 is supported by the frame member 15 provided along the inclined portion 55 , that is, is disposed on the inclined portion 55 of the junction duct 50 via the frame member 15 .

[0082] The frame member 15 is a sheet metal member that supports the terminal block 14 from below, and is fixed to the battery 12 or mounted on another frame member of the battery 12. In addition, the frame member 15 is provided with a through hole 15a (see Figure 2 ).

[0083] The connection block 14 is supported by the frame member 15 with a predetermined gap between the connection block 14 and the inclined portion 55 of the converging duct 50. Thus, an air layer can be provided between the connection block 14 and the inclined portion 55, and the connection block 14 can be efficiently cooled. In addition, the frame member 15 is not necessarily provided, and for example, the connection block 14 may be directly placed on the inclined portion 55 of the converging duct 50.

[0084] The inclined portion 55 is located below the upper surfaces of the left battery 12L and the right battery 12R. This can prevent the vertical length of the battery pack 10 from increasing when the terminal block 14 is disposed on the inclined portion 55.

[0085] The cooling fan 60 is, for example, a sirocco fan, and has an impeller (not shown) that can rotate around a rotation axis L inside, an air inlet 61 that opens downward, and an air outlet 62 that opens rearward (see FIG. Figure 2The air inlet 61 is connected to the fan connection portion 54 of the merging duct 50 , and the cooling air is sucked in by the rotation of the impeller. The air outlet 62 is connected to the exhaust duct 18 , and the cooling air sucked in from the air inlet 61 is discharged to the exhaust duct 18 .

[0086] The cooling fan 60 is arranged to be inclined to the same side as the inclined portion 55, that is, the left side. More specifically, the fan connecting portion 54 of the merging duct 50 is arranged to be inclined to the same side as the inclined portion 55, that is, to the left side, and the cooling fan 60 is connected to the fan connecting portion 54 via the fan bracket 65 to be inclined to the left side.

[0087] Figure 5 The dotted arrows in represent the flow of cooling air flowing through the left air intake path 40L, the right air intake path 40R, and the merging duct 50. The upper surface of the merging duct 50 is provided with an inclined portion 55 inclined to the left, so that in the flow path in the merging duct 50, the path FP1 of the cooling air introduced from the left air intake path 40L and flowing on the left is shorter than the path FP2 of the cooling air introduced from the right air intake path 40R and flowing on the right, resulting in a path difference. Therefore, by setting the cooling fan 60 to be inclined to the same side as the inclined portion 55, that is, to the left, the flow of cooling air in the merging duct 50 obtained based on the path difference can be made nearly uniform, and the generation of turbulence in the merging duct 50 can be suppressed.

[0088] In addition, if Figure 5 As shown, a transmission shaft 9 provided in the vehicle's drive system is disposed below the housing 20 and the floor 4. Specifically, the housing body 22 is provided with the aforementioned recessed portion 24, and the floor 4 is provided with a recessed portion 4a that is recessed upward and extends in the front-rear direction. The transmission shaft 9 is disposed in the recessed portion 24 of the housing body 22 and the recessed portion 4a of the floor 4.

[0089] The transmission shaft 9 generates heat due to rotation, so Figure 5 As shown by the solid arrow, the battery pack 10 receives heat from the transmission shaft 9. In addition, for example, in a high temperature environment, the battery pack 10 receives heat from the road surface.

[0090] Therefore, a heat insulating material 70 is provided between the housing 20 and the floor 4. In the present embodiment, the heat insulating material 70 is provided so as to cover the entire lower surface of the housing body 22 including the recessed portion 24. Thus, it is possible to suppress the battery 12, the terminal block 14, etc. from being affected by the heat from below the battery pack 10. In addition, the heat insulating material 70 may be provided only at a position on the lower surface of the housing body 22 that overlaps with the transmission shaft 9 when viewed from above. Thus, it is possible to suppress the battery 12, the terminal block 14, etc. from being affected by the heat from the transmission shaft 9.

[0091] The merging duct 50 is arranged at a position overlapping with the propeller shaft 9 of the vehicle in a plan view. Thus, the merging duct 50 can receive heat from the propeller shaft 9, and the junction block 14 can be further prevented from being affected by the heat from the propeller shaft 9.

[0092] Furthermore, a recessed portion 56 recessed upward is provided on the lower surface of the confluence portion 53 of the confluence duct 50. The recessed portion 56 of the confluence portion 53 is provided along the recessed portion 24 of the housing body 22. With such a structure, the surface area of ​​the confluence duct 50 facing the transmission shaft 9 can be increased, so that the battery 12, the junction station 14, etc. can be further suppressed from being affected by the heat from the transmission shaft 9.

[0093] Above, one embodiment of the present invention has been described with reference to the accompanying drawings, but the present invention is certainly not limited to this embodiment. Obviously, those skilled in the art can think of various variations or modifications within the scope of the technical solution, and it should be understood that these variations and modifications also belong to the technical scope of the present invention. In addition, the various constituent elements in the above-mentioned embodiment can also be arbitrarily combined within the scope of the main purpose of the invention.

[0094] For example, in the above-mentioned embodiment, the junction block 14 is arranged at the inclined portion 55 of the converging duct 50, but the present invention is not limited thereto. For example, other electrical devices, such as the battery ECU 13, may be arranged at the inclined portion 55. In addition, when the battery pack 10 is provided with an inverter or a DC-DC converter, the inverter or the DC-DC converter may be arranged at the inclined portion 55 of the converging duct 50.

[0095] At least the following matters are described in this specification: In parentheses, corresponding components in the above-mentioned embodiment are shown as an example, but the present invention is not limited to this.

[0096] (1) A battery pack for a vehicle (battery pack 10 ), comprising:

[0097] A first battery (left battery 12L) and a second battery (right battery 12R) are arranged to be separated from each other in the horizontal direction;

[0098] An electrical device (a junction box 14) electrically connected to the first storage battery and the second storage battery;

[0099] A cooling mechanism (cooling mechanism 16 ) for cooling the first storage battery and the second storage battery by cooling air; and

[0100] A housing (housing 20) for accommodating the first storage battery, the second storage battery, the electrical device, and the cooling mechanism, wherein:

[0101] The cooling mechanism comprises:

[0102] a first intake path (left intake path 40L) in which the first battery is arranged and through which the cooling air flows;

[0103] a second air intake path (right air intake path 40R) in which the second battery is arranged and through which the cooling air flows;

[0104] a merging duct (merging duct 50 ) disposed between the first battery and the second battery and connected to the first intake path and the second intake path; and

[0105] a cooling fan (cooling fan 60 ) connected to the merging duct to allow the cooling air to flow through the first intake path, the second intake path, and the merging duct;

[0106] An inclined portion (inclined portion 55) is provided on the upper surface of the converging pipe.

[0107] The electrical device is disposed on the inclined portion.

[0108] According to (1), the electrical device is arranged on the upper surface of the converging duct, so that the electrical device can be cooled by utilizing the converging duct to receive heat from the electrical device. In addition, an inclined portion is provided on the upper surface of the converging duct, and the electrical device is arranged on the inclined portion, so that the electrical device can be easily approached by tools used when assembling the electrical device, and the assembling performance of the electrical device is good.

[0109] (2) The vehicle battery pack according to (1), wherein:

[0110] In the electric device, a terminal (terminal 14 a ) for connecting a wiring (DC line 19 ) is provided on the higher side of the inclined portion.

[0111] According to (2), it is possible to ensure a working space for a tool used when assembling the wiring to the electric device on the higher side of the inclined portion.

[0112] (3) The vehicle battery pack according to (1) or (2), wherein:

[0113] The vehicle battery pack further includes a frame member (frame member 15 ) which is provided along the inclined portion and supports the electrical device.

[0114] The electrical device is supported by the frame member with a predetermined gap provided between the electrical device and the inclined portion of the junction duct.

[0115] According to (3), an air layer can be provided between the electric device and the inclined portion, so the electric device can be cooled efficiently.

[0116] (4) The vehicle battery pack according to any one of (1) to (3), wherein:

[0117] The inclined portion is located below upper surfaces of the first battery and the second battery.

[0118] According to (4), it is possible to suppress an increase in the length dimension of the battery pack in the vertical direction.

[0119] (5) The vehicle battery pack according to any one of (1) to (4), wherein:

[0120] The inclined portion is inclined toward one of the first battery and the second battery.

[0121] According to (5), a working space for a tool for assembling the electric device can be ensured above the first storage battery or the second storage battery.

[0122] (6) The vehicle battery pack according to (5), wherein:

[0123] The inclined portion is inclined toward the first battery side,

[0124] The merging duct is configured so that a path (path FP1) of the cooling air flowing on the first battery side is shorter than a path (path FP2) of the cooling air flowing on the second battery side.

[0125] The cooling fan is disposed to be inclined toward the same side as the inclined portion.

[0126] According to (6), the cooling fan is provided to be inclined toward the same side as the inclined portion, so that the flow in the merging duct obtained based on the path difference in the merging duct can be made nearly uniform.

[0127] (7) The vehicle battery pack according to any one of (1) to (6), wherein:

[0128] The housing is placed on the floor (floor 4) of the vehicle.

[0129] A power transmission shaft (propeller shaft 9) provided in the driving system of the vehicle is arranged below the housing and the floor.

[0130] A heat insulating material (heat insulating material 70 ) is provided between the housing and the floor at a position overlapping at least the power transmission shaft in a plan view.

[0131] According to (7), by providing the heat insulating material, it is possible to suppress the influence of heat from the power transmission shaft, which is a heat generating body, on the battery or the electric equipment housed in the case.

[0132] (8) The vehicle battery pack according to any one of (1) to (7), wherein:

[0133] The housing is placed on the floor (floor 4) of the vehicle.

[0134] A power transmission shaft (propeller shaft 9) provided in the driving system of the vehicle is arranged below the housing and the floor.

[0135] The merging duct is arranged at a position overlapping with the power transmission shaft in a plan view.

[0136] According to (8), the junction duct is arranged between the electric device and the power transmission shaft, so that the electric device can be prevented from being affected by the heat from the power transmission shaft.

[0137] (9) The vehicle battery pack according to (8), wherein:

[0138] The housing and the lower surface of the floor are provided with a recessed portion (recessed portion 24, recessed portion 4a) which is recessed upward and in which the power transmission shaft is disposed.

[0139] The merging duct is arranged along the recess.

[0140] According to (9), the surface area of ​​the merging duct facing the power transmission shaft can be increased, so that the battery, electrical equipment, etc. housed in the case can be prevented from being affected by the heat from the power transmission shaft.

[0141] (10) The vehicle battery pack according to any one of (1) to (9), wherein:

[0142] The electrical device is a junction box electrically connected to the first storage battery and the second storage battery.

[0143] According to (10), the junction station can be cooled through the junction duct.

Claims

1. A battery pack for a vehicle, comprising: a first storage battery and a second storage battery arranged to be separated from each other in a horizontal direction; an electrical device electrically connected to the first storage battery and the second storage battery; A cooling mechanism for cooling the first battery and the second battery by cooling air; and A housing for accommodating the first storage battery, the second storage battery, the electrical device, and the cooling mechanism, wherein: The cooling mechanism comprises: a first air intake path, in which the first battery is disposed and through which the cooling air flows; a second air intake path, in which the second battery is disposed and through which the cooling air flows; a merging duct disposed between the first battery and the second battery and connected to the first intake path and the second intake path; and a cooling fan connected to the merging duct to allow the cooling air to flow through the first air intake path, the second air intake path, and the merging duct; An inclined portion is provided on the upper surface of the converging pipe. The electrical device is disposed on the inclined portion.

2. The vehicle battery pack according to claim 1, wherein: In the electric device, a terminal for connecting wiring is provided on the higher side of the inclined portion.

3. The vehicle battery pack according to claim 1 or 2, wherein: The vehicle battery pack further includes a frame member, the frame member being provided along the inclined portion and supporting the electric device. The electrical device is supported by the frame member with a predetermined gap provided between the electrical device and the inclined portion of the junction duct.

4. The vehicle battery pack according to claim 1 or 2, wherein: The inclined portion is located below upper surfaces of the first battery and the second battery.

5. The vehicle battery pack according to claim 1 or 2, wherein: The inclined portion is inclined toward one of the first battery and the second battery.

6. The vehicle battery pack according to claim 5, wherein: The inclined portion is inclined toward the first battery side, The merging duct is configured so that a path of the cooling air flowing on the first battery side is shorter than a path of the cooling air flowing on the second battery side. The cooling fan is disposed to be inclined toward the same side as the inclined portion.

7. The vehicle battery pack according to claim 1 or 2, wherein: The housing is placed on the floor of the vehicle. A power transmission shaft provided in a driving system of the vehicle is arranged below the housing and the floor. A heat insulating material is provided between the housing and the floor at least at a position overlapping with the power transmission shaft in a plan view.

8. The vehicle battery pack according to claim 1 or 2, wherein: The housing is placed on the floor of the vehicle. A power transmission shaft provided in a driving system of the vehicle is arranged below the housing and the floor. The merging duct is arranged at a position overlapping with the power transmission shaft in a plan view.

9. The vehicle battery pack according to claim 8, wherein: The housing and the lower surface of the floor are provided with a recessed portion which is recessed upward and in which the power transmission shaft is disposed. The merging duct is arranged along the recess.

10. The vehicle battery pack according to claim 1 or 2, wherein: The electrical device is a junction box electrically connected to the first storage battery and the second storage battery.

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