Battery pack for vehicle

Abstract

To provide a battery pack for a vehicle in which cooling and assembling performance for an electrical apparatus arranged inside a case are excellent.SOLUTION: A battery pack 10 includes: a left battery 12L and a right battery 12R that are arranged to be spaced apart from each other; a junction board 14; a cooling mechanism 16 that cools the batteries 12L and 12R; and a case 20 that houses them. The cooling mechanism 16 has: a left intake path 40L in which the left battery 12L is disposed and through which cooling air flows; a right intake path 40R in which the right battery 12R is disposed and through which cooling air flows; a junction duct 50 that is provided between the left battery 12L and the right battery 12R; and a cooling fan 60 that is connected to the junction duct 50. A slope portion 55 is provided on an upper surface of the junction duct 50, and the junction board 14 is disposed on the slope 55.SELECTED DRAWING: Figure 3

Description

[Technical Field]

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

[0002] In recent years, research and development into secondary batteries that contribute to energy efficiency has been conducted to ensure that more people have access to affordable, reliable, sustainable and advanced energy.

[0003] As vehicle drive sources become more electrically powered, 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 electrical devices are housed in a case and mounted on the vehicle as a unit (see, for example, Patent Documents 1 and 2). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2018-30450 A [Patent Document 2] Japanese Patent Application Laid-Open No. 2013-244768 Summary of the Invention [Problem to be solved by the invention]

[0005] There has been a demand for a battery pack that allows for the arrangement of electrical equipment that generates heat so that it can be appropriately cooled in the limited space inside the case, while also allowing for easy assembly of the electrical equipment.

[0006] The present invention provides a vehicle battery pack that provides excellent cooling of electrical equipment arranged inside the case and ease of assembly. [Means for solving the problem]

[0007] The present invention provides a first battery and a second battery arranged spaced apart from each other in a horizontal direction; an electric device electrically connected to the first battery and the second battery; a cooling mechanism that cools the first battery and the second battery with cooling air; a case that houses the first battery, the second battery, the electrical device, and the cooling mechanism, The cooling mechanism includes: a first intake path in which the first battery is disposed and through which the cooling air flows; a second intake path in which the second battery is disposed and through which the cooling air flows; a confluence duct provided between the first battery and the second battery and connected to the first intake path and the second intake path; a cooling fan connected to the junction duct to circulate the cooling air through the first intake path, the second intake path, and the junction duct, An inclined portion is provided on the upper surface of the junction duct, The electrical device is disposed on the inclined portion. [Effects of the Invention]

[0008] According to the present invention, the cooling and assembly of the electrical equipment placed in the case are excellent. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a perspective view of a battery pack 10 according to an embodiment of the present invention. [Figure 2] FIG. 2 is an exploded perspective view of the battery pack 10. [Figure 3] 2 is a front view of each component housed in a case 20 of a battery pack 10. FIG. [Figure 4] FIG. 2 is a perspective view of a junction duct 50. [Figure 5] 2 is a diagram showing the flow of cooling air (broken arrows) and the transfer of heat (solid arrows) within the battery pack 10. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] A vehicle battery pack according to one embodiment of the present invention will be described below with reference to the accompanying drawings. The drawings are to be viewed in accordance with the directions indicated by the reference numerals. For simplicity and clarity, the front-rear, left-right, and up-down directions in this specification are described as being from the driver's perspective. In the drawings, the front of the vehicle is indicated as Fr, the rear as Rr, the left as L, the right as R, the top as U, and the bottom as D.

[0011] 1 is mounted on an electrically powered vehicle (hereinafter also simply 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 power stored in the battery pack 10. Furthermore, the battery pack 10 is configured to be able to recover regenerative power from the motor generator when the vehicle is decelerating, etc.

[0012] 5, which will be described later, the battery pack 10 is placed on a floor panel 4 of the vehicle. More specifically, the battery pack 10 is placed on the floor panel 4 below a seat arranged in the vehicle interior, for example.

[0013] As shown in Figures 1 and 2, 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 board 14 on which wiring components through which charging current and discharging current of the batteries 12 flow are mounted, a cooling mechanism 16 that cools the batteries 12 with cooling air, an exhaust duct 18 that discharges the cooling air that has cooled the batteries 12 into the vehicle interior, and a case 20 that houses the batteries 12, the battery ECU 13, the junction board 14, and the cooling mechanism 16.

[0014] As shown in Fig. 5, the case 20 is placed on the floor panel 4. Specifically, the case 20 is located in the center of the vehicle in the left-right direction, and the vehicle's propeller shaft 9, which extends in the front-rear direction, is disposed below the case 20 and the floor panel 4. The propeller shaft 9 transmits the driving force of the engine and motor generator, which are the driving sources of the vehicle, to the rear wheels.

[0015] 1 and 2, the case 20 has a case body 22 which is a bottomed container type having an opening facing upward, and a lid member 25 which covers the opening of the case body 22.

[0016] The inside of the case body 22 is an accommodation section 23 that accommodates the battery 12, the battery ECU 13, the junction board 14, the cooling mechanism 16, etc. The bottom surface of the case body 22 is provided with a recess 24 that is recessed upward and in which the propeller shaft 9 is disposed.

[0017] The cover member 25 is a plate-shaped member that closes the opening of the case body 22. The cover member 25 is provided with a left air intake port 26L and a right air intake port 26R that are spaced apart in the left-right direction, and an exhaust port 28 that is located at the center and rear in the left-right direction. The left air intake port 26L and the right air intake port 26R are formed in the left grill cover 27L and the right grill cover 27R, respectively, and are air intake inlets that draw cooling air from the vehicle cabin into the accommodation portion 23 of the case body 22. The exhaust port 28 is connected to an exhaust duct 18 that extends in the left-right direction behind the cover member 25, and the cooling air that has cooled the battery 12 is dispersed and exhausted to the left and right sides of the vehicle cabin via the exhaust duct 18.

[0018] Of the four batteries 12, two are arranged on the right side and two are arranged on the left side in the storage section 23 of the case body 22. If 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 battery 12L and the right battery 12R are arranged spaced apart from each other in the left-right direction. Note that the number of batteries 12 is not limited to four, and it is sufficient that at least one is provided on the left side of the case body 22 and at least one is provided on the right side of the case body 22.

[0019] Each battery 12 has a plurality of battery cells 12a stacked in the front-rear direction, and the stacked battery cells 12a are modularized to form a battery module. Between adjacent battery cells 12a, inter-cell flow paths 12b are formed along the vertical direction, through which cooling air introduced from the left air intake port 26L and the right air intake port 26R flows. The inter-cell flow paths 12b are open at the top and bottom, and are airtightly closed at the front, rear, and left and right sides.

[0020] The battery ECU 13 is disposed 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.

[0021] The junction board 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 board 14 is connected to the battery 12 via, for example, a bus bar (not shown).

[0022] 4, a terminal 14a to which a DC wire 19 is connected is provided on the right surface of the junction board 14. A power control device including an inverter and a DC-DC converter is arranged in the vehicle together with the motor generator, and the junction board 14 and the power control device are electrically connected via the DC wire 19.

[0023] Returning to Figures 1 and 2, the cooling mechanism 16 includes a left-side intake path 40L, through which the left-side battery 12L is located and through which cooled air drawn in from the vehicle compartment flows, a right-side intake path 40R, through which the right-side battery 12R is located and through which cooled air drawn in from the vehicle compartment flows, a junction duct 50 provided between the left-side battery 12L and the right-side battery 12R and connected to the left-side intake path 40L and the right-side intake path 40R, and a cooling fan 60 connected to the junction duct 50 and circulating cooled air through the right-side intake path 40R, the left-side intake path 40L, and the junction duct 50.

[0024] The left side intake path 40L includes a left side intake port 26L provided in the cover member 25, a left side upstream duct 41L provided along the upper surface of the left side battery 12L, an inter-cell flow path 12b of the left side battery 12L, and a left side downstream duct 42L provided along the lower surface of the left side battery 12L.

[0025] The left upstream duct 41L is connected to the left intake port 26L and the inter-cell flow passage 12b of the left battery 12L. The left upstream duct 41L has an opening 41a at a position corresponding to the left intake port 26L, and guides the cooling air taken in through the left intake port 26L to the inter-cell flow passage 12b of the left battery 12L.

[0026] The left downstream duct 42L is connected to the inter-cell flow passage 12b of the left battery 12L and the junction duct 50, and guides the cooling air that has flowed through the inter-cell flow passage 12b to the junction duct 50. The left downstream duct 42L has a connection part 43L at its right end that opens upward and is connected to the junction duct 50. The connection part 43L is located forward of the center of the left downstream duct 42L in the front-to-rear direction.

[0027] Like the left-side intake path 40L, the right-side intake path 40R includes a right-side intake port 26R provided in the cover member 25, a right-side upstream duct 41R provided along the upper surface of the right-side battery 12R, an inter-cell flow path 12b of the right-side battery 12R, and a right-side downstream duct 42R provided along the lower surface of the right-side battery 12R.

[0028] The right upstream duct 41R is connected to the right intake port 26R and the inter-cell flow passage 12b of the right battery 12R. The right upstream duct 41R has an opening 41a at a position corresponding to the right intake port 26R, and guides the cooling air taken in through the right intake port 26R to the inter-cell flow passage 12b of the right battery 12R.

[0029] The right downstream duct 42R is connected to the inter-cell flow passage 12b of the right battery 12R and the junction duct 50, and guides the cooling air that has flowed through the inter-cell flow passage 12b to the junction duct 50. The right downstream duct 42R has a connection part 43R at its left end that opens upward and is connected to the junction duct 50. The connection part 43R is located forward of the center of the right downstream duct 42R in the front-to-rear direction.

[0030] As shown in Figures 3 and 4, the confluence duct 50 has a left-side connection portion 51 connected to the connection portion 43L of the left-side downstream duct 42L, a right-side connection portion 52 connected to the connection portion 43R of the right-side downstream duct 42R, a confluence portion 53 where the cooling air introduced from the left-side connection portion 51 and the right-side connection portion 52 converge, a fan connection portion 54 provided downstream of the confluence portion 53 and connected to the cooling fan 60, and an inclined portion 55 provided on the upper surface of the confluence duct 50.

[0031] The left connection portion 51 and the right connection portion 52 have openings facing downward, and are provided at the left lower portion and the right lower portion of the junction portion 53, respectively.

[0032] The junction 53 forms a flow path that extends upward and rearward from the left connection portion 51 and the right connection portion 52 to the fan connection portion 54. A height H1 of a left end portion 53a of the junction 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 a height H2 of a right end portion 53b of the junction 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 junction 53 is configured asymmetrically, with the upper end of the left end portion 53a being located lower than the upper end of the right end portion 53b.

[0033] The fan connection part 54 is provided at the rear of the confluence part 53 and forms an upward flow path. The fan connection part 54 has an opening 54a facing upward, and the cooling fan 60 is connected to the fan connection part 54 from above via a fan bracket 65 (see FIG. 2).

[0034] The inclined portion 55 is provided on the upper surface of the junction 53. As described above, the upper end of the left end 53a of the junction 53 is located lower than the upper end of the right end 53b, so the inclined portion 55 slopes downward from the right side to the left side. In other words, the inclined portion 55 slopes toward the left battery 12L in the direction in which the left battery 12L and the right battery 12R are aligned.

[0035] In this embodiment, the junction board 14 is disposed on an inclined portion 55 provided on the upper surface of the junction duct 50.

[0036] Because the junction board 14 is disposed on the upper surface of the junction duct 50, the heat generated by the junction board 14 is received by the junction duct 50, thereby allowing the junction board 14 to be appropriately cooled. In particular, by providing the inclined portion 55 on the upper surface of the junction duct 50, i.e., the heat receiving surface, the surface area of ​​the heat receiving surface can be increased compared to when the inclined portion 55 is not provided, and the cooling efficiency of the junction board 14 is improved.

[0037] Furthermore, if the junction board 14 is cooled by being placed directly in the flow path through which the cooling air flows, the number of ducts may increase in order to provide a flow path that passes through the junction board 14. However, in this embodiment, the junction board 14 is placed outside the flow path of the cooling air to cool the junction board 14, so the number of ducts can be reduced, which contributes to lower costs and a smaller battery pack 10.

[0038] Furthermore, since the junction board 14 is disposed on the inclined portion 55, the tool T used during assembly can easily access the junction board 14 in the narrow space between the left battery 12L and the right battery 12R. Therefore, the junction board 14 can be more easily assembled than when the junction board 14 is disposed horizontally.

[0039] To explain more specifically the ease of assembly of the junction board 14, the junction board 14 has a terminal 14a on the right side, which is the higher side of the inclined portion 55, and when the DC wire 19 is fixed to the terminal 14a with a fastening member, a working space for the tool T can be secured above the right battery 12R.

[0040] The junction board 14 is supported by a frame member 15 provided along the inclined portion 55 , that is, it is disposed on the inclined portion 55 of the junction duct 50 via the frame member 15 .

[0041] The frame member 15 is a sheet metal member that supports the junction board 14 from below, and is fixed to, for example, the battery 12 or another frame member attached to the battery 12. The frame member 15 also has a through-hole 15a (see FIG. 2) on a surface facing the lower surface of the junction board 14.

[0042] The junction board 14 is supported by the frame member 15 with a predetermined gap provided between it and the inclined portion 55 of the junction duct 50. This allows an air layer to be provided between the junction board 14 and the inclined portion 55, enabling efficient cooling of the junction board 14. Note that the frame member 15 does not necessarily have to be provided, and for example, the junction board 14 may be configured to be placed directly on the inclined portion 55 of the junction duct 50.

[0043] The inclined portion 55 is located below the upper surfaces of the left battery 12L and the right battery 12R. This prevents the vertical length of the battery pack 10 from increasing when the junction board 14 is placed on the inclined portion 55.

[0044] Cooling fan 60 is, for example, a sirocco fan, and has an impeller (not shown) inside that can rotate around rotation axis L, an intake port 61 that opens downward, and an exhaust port 62 (see FIG. 2) that opens rearward. Intake port 61 is connected to fan connection portion 54 of junction duct 50, and draws in cooling air as the impeller rotates. Exhaust port 62 is connected to exhaust duct 18, and discharges the cooling air drawn in through intake port 61 into exhaust duct 18.

[0045] The cooling fan 60 is provided on the same side as the inclined portion 55, i.e., inclined to the left. To explain in more detail, the fan connection portion 54 of the junction duct 50 is provided on the same side as the inclined portion 55, i.e., inclined to the left, and the cooling fan 60 is connected to the fan connection portion 54 via a fan bracket 65, inclined to the left.

[0046] 5 indicate the flow of cooling air circulating through the left intake path 40L, the right 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. Therefore, among the flow paths within the merging duct 50, the path FP1 of the cooling air introduced from the left intake path 40L and flowing on the left side is shorter than the path FP2 of the cooling air introduced from the right intake path 40R and flowing on the right side, resulting in a path difference. Therefore, by providing the cooling fan 60 on the same side as the inclined portion 55, i.e., inclined to the left side, the flow of cooling air within the merging duct 50 due to the path difference can be made more uniform, and the occurrence of turbulence within the merging duct 50 can be suppressed.

[0047] 5, a propeller shaft 9 provided in the vehicle's drivetrain is disposed below the case 20 and floor panel 4. Specifically, the case main body 22 is provided with the recess 24 described above, and the floor panel 4 is provided with a recess 4a that is recessed upward and extends along the front-to-rear direction. The propeller shaft 9 is disposed in the recess 24 of the case main body 22 and the recess 4a of the floor panel 4.

[0048] Since the propeller shaft 9 generates heat as it rotates, the battery pack 10 receives heat from the propeller shaft 9 as shown by the solid arrow in Figure 5. Furthermore, in a high-temperature environment, for example, the battery pack 10 receives heat from the road surface.

[0049] Therefore, a heat insulating material 70 is provided between the case 20 and the floor panel 4. In this embodiment, the heat insulating material 70 is provided so as to cover the entire lower surface of the case main body 22, including the recess 24. This makes it possible to suppress the effects of heat from below the battery pack 10 on the battery 12, junction board 14, etc. Note that the heat insulating material 70 may be provided only at a position on the lower surface of the case main body 22 that overlaps with the propeller shaft 9 in a top view. This makes it possible to suppress the effects of heat from the propeller shaft 9 on the battery 12, junction board 14, etc.

[0050] The junction duct 50 is disposed in a position overlapping the vehicle's propeller shaft 9 in a top view. This allows the junction duct 50 to receive heat from the propeller shaft 9, further reducing the effect of heat from the propeller shaft 9 on the junction board 14.

[0051] Furthermore, an upwardly recessed recess 56 is provided on the lower surface of the junction section 53 of the junction duct 50. The recess 56 of the junction section 53 is provided along the recess 24 of the case main body 22. With this configuration, the surface area of ​​the junction duct 50 facing the propeller shaft 9 can be increased, further reducing the effect of heat from the propeller shaft 9 on the battery 12, junction board 14, etc.

[0052] Although one embodiment of the present invention has been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such an embodiment. It is clear that a person skilled in the art can conceive of various modifications or alterations within the scope of the claims, and it is understood that these also naturally fall within the technical scope of the present invention. Furthermore, the components of the above embodiment may be combined in any manner without departing from the spirit of the invention.

[0053] For example, in the above-described embodiment, the junction board 14 is disposed on the inclined portion 55 of the junction duct 50, but this is not limiting. For example, other electrical devices, such as the battery ECU 13, may be disposed on the inclined portion 55. Furthermore, if the battery pack 10 includes, for example, an inverter or a DC-DC converter, these may be disposed on the inclined portion 55 of the junction duct 50.

[0054] This specification describes at least the following: In parentheses, components corresponding to those in the above-described embodiments are shown as examples, but the present invention is not limited to these.

[0055] (1) A first battery (left battery 12L) and a second battery (right battery 12R) arranged apart from each other in the horizontal direction; an electrical device (junction board 14) electrically connected to the first battery and the second battery; a cooling mechanism (cooling mechanism 16) that cools the first battery and the second battery with cooling air; A vehicle battery pack (battery pack 10) including a case (case 20) that houses the first battery, the second battery, the electrical equipment, and the cooling mechanism, The cooling mechanism includes: a first intake path (left intake path 40L) in which the first battery is disposed and through which the cooling air flows; a second intake path (right intake path 40R) in which the second battery is disposed and through which the cooling air flows; a junction duct (junction duct 50) provided between the first battery and the second battery and connected to the first intake path and the second intake path; a cooling fan (cooling fan 60) connected to the confluence duct and circulating the cooling air through the first intake path, the second intake path, and the confluence duct; An inclined portion (inclined portion 55) is provided on the upper surface of the confluence duct, The electrical device is disposed on the inclined portion. Vehicle battery pack.

[0056] According to (1), the electrical equipment is arranged on the upper surface of the junction duct, so that the electrical equipment can be cooled by the junction duct receiving heat from the electrical equipment. In addition, the upper surface of the junction duct is provided with an inclined portion, and the electrical equipment is arranged on the inclined portion, so that tools used for assembling the electrical equipment can easily access the electrical equipment, improving the ease of assembling the electrical equipment.

[0057] (2) A vehicle battery pack according to (1), The electrical device is provided with a terminal (terminal 14a) on the higher side of the inclined portion to which a wiring (DC line 19) is connected. Vehicle battery pack.

[0058] According to (2), a working space for tools used when assembling the wiring to the electrical device can be secured on the higher side of the inclined portion.

[0059] (3) A vehicle battery pack according to (1) or (2), The electric appliance further includes a frame member (frame member 15) that is provided along the inclined portion and supports the electric appliance. the electrical equipment is supported by the frame member with a predetermined gap provided between the electrical equipment and the inclined portion of the junction duct. Vehicle battery pack.

[0060] According to (3), an air layer can be provided between the electrical equipment and the inclined portion, so that the electrical equipment can be cooled efficiently.

[0061] (4) A vehicle battery pack according to any one of (1) to (3), the inclined portion is located below the upper surfaces of the first battery and the second battery. Vehicle battery pack.

[0062] According to (4), the vertical length of the battery pack can be prevented from increasing.

[0063] (5) A vehicle battery pack according to any one of (1) to (4), The inclined portion is inclined toward either the first battery or the second battery. Vehicle battery pack.

[0064] According to (5), a working space for tools used to assemble the electrical device can be secured above the first battery or the second battery.

[0065] (6) A vehicle battery pack according to (5), the inclined portion is inclined toward the first battery, the confluence duct is configured such 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, The cooling fan is provided inclined to the same side as the inclined portion. Vehicle battery pack.

[0066] According to (6), since the cooling fan is provided inclined on the same side as the inclined portion, the flow in the junction duct based on the path difference in the junction duct can be made nearly uniform.

[0067] (7) A vehicle battery pack according to any one of (1) to (6), The case is placed on a floor panel (floor panel 4) of the vehicle, A power transmission shaft (propeller shaft 9) provided in a drive system of the vehicle is disposed below the case and the floor panel, A heat insulating material (heat insulating material 70) is provided between the case and the floor panel at a position overlapping at least with the power transmission shaft when viewed from above. Vehicle battery pack.

[0068] According to (7), by providing a 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 and electrical equipment housed in the case.

[0069] (8) A vehicle battery pack according to any one of (1) to (7), The case is placed on a floor panel (floor panel 4) of the vehicle, A power transmission shaft (propeller shaft 9) provided in a drive system of the vehicle is disposed below the case and the floor panel, The junction duct is disposed at a position overlapping the power transmission shaft in a top view. Vehicle battery pack.

[0070] According to (8), since the confluence duct is disposed between the electric device and the power transmission shaft, the influence of heat from the power transmission shaft on the electric device can be suppressed.

[0071] (9) A vehicle battery pack according to (8), The lower surfaces of the case and the floor panel are provided with recesses (recesses 24, 4a) that are recessed upward and in which the power transmission shaft is disposed, The confluence duct is provided along the recess. Vehicle battery pack.

[0072] According to (9), the surface area of ​​the junction duct facing the power transmission shaft can be increased, thereby preventing the battery, electrical equipment, etc. housed in the case from being affected by heat from the power transmission shaft.

[0073] (10) A vehicle battery pack according to any one of (1) to (9), the electrical device is a junction board electrically connected to the first battery and the second battery; Vehicle battery pack.

[0074] According to (10), the junction board can be cooled by the confluence duct. [Explanation of symbols]

[0075] 4 Floor Panels 9 Propeller shaft (power transmission shaft) 10 Battery pack (vehicle battery pack) 12L Left battery (first battery) 12R Right battery (second battery) 14 Junction board (electrical equipment) 14a terminal 15 Frame members 16 Cooling mechanism 19 DC line (wiring) 20 cases 40L Left intake path (first intake path) 40R Right-side intake path (second intake path) 50 Confluence duct 55 Slope 60 Cooling fan 70 Insulation FP1 Route FP2 Route

Claims

1. a first battery and a second battery arranged spaced apart from each other in a horizontal direction; an electric device electrically connected to the first battery and the second battery; a cooling mechanism that cools the first battery and the second battery with cooling air; A vehicle battery pack including: a case that houses the first battery, the second battery, the electrical device, and the cooling mechanism, The cooling mechanism includes: a first intake path in which the first battery is disposed and through which the cooling air flows; a second intake path in which the second battery is disposed and through which the cooling air flows; a confluence duct provided between the first battery and the second battery and connected to the first intake path and the second intake path; a cooling fan connected to the junction duct for circulating the cooling air through the first intake path, the second intake path, and the junction duct; The upper surface of the junction duct is provided with an inclined portion, The electrical device is disposed on the inclined portion. Vehicle battery pack.

2. 2. The vehicle battery pack according to claim 1, The electrical device is provided with a terminal to which a wire is connected on the higher side of the inclined portion. Vehicle battery pack.

3. 3. The vehicle battery pack according to claim 1, a frame member provided along the inclined portion and supporting the electrical device; The electrical equipment is supported by the frame member with a predetermined gap provided between the electrical equipment and the inclined portion of the junction duct. Vehicle battery pack.

4. 3. The vehicle battery pack according to claim 1, The inclined portion is located below the upper surfaces of the first battery and the second battery. Vehicle battery pack.

5. 3. The vehicle battery pack according to claim 1, The inclined portion is inclined toward either the first battery or the second battery. Vehicle battery pack.

6. 6. The vehicle battery pack according to claim 5, The inclined portion is inclined toward the first battery, the junction duct is configured such 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 provided inclined to the same side as the inclined portion. Vehicle battery pack.

7. 3. The vehicle battery pack according to claim 1, The case is placed on a floor panel of a vehicle, a power transmission shaft provided in a drive system of the vehicle is disposed below the case and the floor panel, a heat insulating material is provided between the case and the floor panel at least at a position overlapping with the power transmission shaft in a top view; Vehicle battery pack.

8. 3. The vehicle battery pack according to claim 1, The case is placed on a floor panel of a vehicle, a power transmission shaft provided in a drive system of the vehicle is disposed below the case and the floor panel, The junction duct is disposed at a position overlapping with the power transmission shaft in a top view. Vehicle battery pack.

9. 9. The vehicle battery pack according to claim 8, A recess is provided on the lower surface of the case and the floor panel, the recess being recessed upward and in which the power transmission shaft is disposed, The junction duct is provided along the recess. Vehicle battery pack.

10. 3. The vehicle battery pack according to claim 1, the electrical device is a junction board electrically connected to the first battery and the second battery, Vehicle battery pack.

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