Vehicle and battery pack

Abstract

The invention relates to a vehicle and a battery pack. A vehicle includes a vehicle body including a vehicle body bottom, and a battery pack attached to the vehicle body below the vehicle body bottom. The battery pack includes an upper surface portion provided so as to face the bottom of the vehicle body, and a heat insulator (attachment member) attached to the upper surface portion. The upper surface portion is provided with a protruding portion that protrudes toward the bottom of the vehicle body. Holes into which the protrusions are inserted are formed in the heat insulating material. The shortest distance between the convex portion and the vehicle body bottom portion is smaller than the minimum value of the thickness of the heat shield.

Description

Technical Field

[0001] The present disclosure relates to a vehicle and a battery pack. Background Art

[0002] Japanese Patent Application Laid-Open No. 2019-046748 discloses a battery pack mounted on a vehicle body frame from the bottom side of the vehicle. The battery pack is equipped with components such as a heat conducting member, a radiator, and a heat insulating sheet. Summary of the invention

[0003] When external force is applied to the battery pack described in Japanese Patent Application Laid-Open No. 2019-046748, components (mounting components) such as the heat conduction member, the heat sink, and the heat insulation sheet may fall off the vehicle. The external force is a vibration load, an impact load, and chemical adhesion.

[0004] The present disclosure has been made to solve the above-mentioned problems, and an object of the present disclosure is to provide a vehicle and a battery pack that can suppress a mounting member mounted on a battery pack from falling off from the vehicle.

[0005] A vehicle according to a first aspect of the present disclosure includes:

[0006] a vehicle body, the vehicle body comprising an underbody; and

[0007] A battery pack is installed below the bottom of the vehicle body.

[0008] Battery pack includes:

[0009] an upper surface portion disposed opposite to a bottom portion of the vehicle body; and

[0010] A mounting member is mounted on the upper surface portion.

[0011] The upper surface portion is provided with a convex portion that protrudes toward the vehicle body bottom side.

[0012] The mounting member has a hole formed therein into which the projection is inserted.

[0013] The shortest distance between the protrusion and the bottom of the vehicle body is smaller than the minimum value of the thickness of the mounting member.

[0014] In the vehicle of the first aspect of the present disclosure, as described above, the shortest distance between the protrusion and the bottom of the vehicle body is less than the minimum value of the thickness of the mounting member. As a result, it is possible to prevent the mounting member from passing through the gap between the protrusion and the bottom of the vehicle body corresponding to the shortest distance. As a result, it is possible to prevent the mounting member mounted on the battery pack from falling off the vehicle.

[0015] Preferably, the vehicle according to the first aspect comprises:

[0016] Engine; and

[0017] An exhaust pipe exhausts gas exhausted from the engine.

[0018] The exhaust pipe is arranged below the bottom of the vehicle body.

[0019] The mounting member is a thermal insulation member.

[0020] If configured in this way, the mounting member (heat insulator) can be used to suppress the transfer of radiant heat from the exhaust pipe to the battery pack. Therefore, suppressing the detachment of the mounting member is effective in suppressing the temperature rise of the battery pack due to the above radiant heat (the temperature of the components in the battery pack exceeding the allowable temperature due to the radiant heat).

[0021] In this case, it is preferable that the mounting member is arranged forward of the center of the battery pack in the front-rear direction of the vehicle body.

[0022] Here, the engine room of the vehicle is generally arranged on the front side of the vehicle body. Therefore, the front side of the battery pack is relatively close to the engine room and is easily affected by the air heated by the engine. Therefore, arranging the mounting member (heat insulation) on the front side of the battery pack is effective in suppressing the temperature rise of the battery pack due to the air heated by the engine (the components in the battery pack exceed the allowable temperature).

[0023] In the vehicle according to the first aspect, it is preferred that the convex portion is separated from the vehicle body bottom.

[0024] This can prevent the vibration of the vehicle body from being transmitted to the battery pack via the convex portion. Therefore, it is possible to prevent the mounting member from falling off the vehicle (battery pack) while preventing the battery pack from being damaged or falling off from the vehicle body due to the vibration of the vehicle body.

[0025] A battery pack according to a second aspect of the present disclosure is a battery pack mounted on a vehicle, the battery pack comprising:

[0026] Battery modules;

[0027] a housing portion that houses the battery module and includes an upper surface portion; and

[0028] A mounting member is mounted on the upper surface portion.

[0029] The upper surface portion is provided so as to face the bottom portion of the vehicle body when the accommodation portion is attached to the vehicle.

[0030] The upper surface portion is provided with a convex portion that protrudes toward the vehicle body bottom side when the storage portion is attached to the vehicle.

[0031] The mounting member has a hole formed therein into which the projection is inserted.

[0032] When the receiving portion is mounted on the vehicle, the shortest distance between the protruding portion and the bottom portion of the vehicle body is smaller than the minimum value of the thickness of the mounting member.

[0033] In the battery pack of the second aspect of the present disclosure, as described above, the shortest distance between the protrusion and the bottom of the vehicle body is smaller than the minimum thickness of the mounting member. This can provide a battery pack that can prevent the mounting member attached to the battery pack from falling off the vehicle.

[0034] According to the present disclosure, it is possible to suppress the attachment member attached to the battery pack from falling off from the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Features, advantages, and technical and industrial significance of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings, in which like reference numerals represent like elements, and in which:

[0036] Figure 1 is a side view showing the structure of a vehicle according to one embodiment;

[0037] Figure 2 is a plan view of a vehicle according to an embodiment viewed from below;

[0038] Figure 3 is a cross-sectional view showing the internal structure of a battery pack according to one embodiment;

[0039] Figure 4 is a plan view of a battery pack according to an embodiment viewed from above;

[0040] Figure 5 It is along Figure 4 A cross-sectional view of line VV;

[0041] Figure 6 It is along Figure 4 A cross-sectional view of line VI-VI;

[0042] Figure 7 is Figure 6 A partial enlarged view of the vicinity of a portion where the distance between the central convex portion and the bottom of the vehicle body is the shortest;

[0043] Figure 8 It is a figure which shows the heat insulating material and the convex part which concern on the modification of one embodiment. DETAILED DESCRIPTION

[0044] use Figures 1 to 7 , the vehicle and battery pack of this embodiment are described. Figures 1 to 7 In the configurations shown in the drawings, the same or substantially the same configurations are denoted by the same reference numerals and repeated descriptions are omitted. Figure 1In the above, “U” indicates an upward direction, “D” indicates a downward direction, “L” indicates a left direction, and “R” indicates a right direction.

[0045] Figure 1 Schematic diagram schematically shows a vehicle 100 equipped with a battery pack 20 of the present embodiment. The vehicle 100 includes a vehicle body 10, a battery pack 20, a drive device 30, and a fuel tank 40. The vehicle 100 is, for example, a PHEV (Plug-in Hybrid Electric Vehicle). The vehicle body 10 includes a vehicle bottom 50. The vehicle bottom 50 is provided at the lower portion (bottom) of the vehicle body 10.

[0046] An engine room 60 and a vehicle interior 70 are formed in the vehicle body 10. The engine room 60 is formed in front of the vehicle interior 70. The engine room 60 is a vehicle body space in which an engine 31 described later is mounted. The vehicle interior 70 is, for example, a space in which passengers ride.

[0047] The drive device 30 includes an engine 31, a rotary electric machine MG1, a rotary electric machine MG2, and a PCU 32. The PCU 32 includes, for example, two inverters and a converter. One inverter is electrically connected to the rotary electric machine MG1, and the other inverter is connected to the rotary electric machine MG2. The converter is electrically connected to the battery pack 20. In addition, the rotary electric machine MG2 mainly functions as a motor for rotating the drive wheels, and the rotary electric machine MG1 mainly functions as a generator. The engine 31 is driven by the fuel supplied from the fuel tank 40 to generate a driving force for rotating the drive wheels.

[0048] The battery pack 20 and the fuel tank 40 are respectively attached to the vehicle body 10 (the vehicle body underbody 50 ) below the vehicle body underbody 50 . The fuel tank 40 is disposed on the rear side of the battery pack 20 .

[0049] Figure 2 is a bottom view showing the bottom surface of the vehicle 100, Figure 3 2 is a plan view (cross-sectional view) schematically showing the structure of the battery pack 20 and its surroundings. Figure 3 This is a plan view of the battery pack 20 as viewed from above.

[0050] The battery pack 20 includes a housing case 21, a plurality of (four in this embodiment) power storage modules 22, and a battery ECU 23 (see Figure 3 ), and the junction box 24 (refer to Figure 3 The housing case 21 houses a plurality of power storage modules 22, a battery ECU 23, and a junction box 24. The housing case 21 and the power storage module 22 are examples of a "housing unit" and a "battery module" in the present disclosure, respectively.

[0051] like Figure 3As shown, the housing 21 includes a front end face 21A, a rear end face 21B, a side face 21C, a side face 21D, and an inclined side face 21E. Figure 3 In the example shown, the side surface 21C is located on the left side. The side surface 21D and the inclined side surface 21E are located on the opposite side to the side surface 21C, and the side surface 21D and the inclined side surface 21E are located on the right side. In addition, the inclined side surface 21E is connected to the top end of the side surface 21D, and the inclined side surface 21E is inclined so as to approach the side surface 21C as it goes forward.

[0052] The four power storage modules 22 are provided at intervals in the width direction (left-right direction) of the vehicle 100. The power storage modules 22 are electrically connected in series with each other.

[0053] Each power storage module 22 includes a plurality of power storage cells. The plurality of power storage cells of each power storage module 22 are arranged in the front-rear direction of the vehicle 100. Each power storage cell is, for example, a secondary battery such as a lithium ion battery, a capacitor, or the like.

[0054] The battery ECU 23 and the junction box 24 are respectively provided in front of the power storage module 22 .

[0055] High voltage wirings 25A and 25B and high voltage wirings 26A and 26B are connected to the junction box 24. The high voltage wirings 25A and 25B electrically connect the junction box 24 and the PCU 32. The high voltage wirings 26A and 26B electrically connect the junction box 24 and the power storage module 22. A relay is provided in the junction box 24. The junction box 24 switches the electrical connection between the high voltage wirings 25A and 25B and the high voltage wirings 26A and 26B.

[0056] A signal wiring 27 including a signal line and the like is connected to the battery ECU 23 , and the signal wiring 27 electrically connects the battery ECU 23 to an ECU (not shown) of the vehicle 100 .

[0057] The vehicle 100 includes an exhaust pipe 80 and a cooling circuit 90. The exhaust pipe 80 is connected to the engine 31 (see Figure 1 ) is connected. The exhaust pipe 80 exhausts the gas exhausted from the engine 31. The exhaust pipe 80 is arranged below the bottom 50 of the vehicle body. The exhaust pipe 80 is formed in a manner that passes under the bottom 50 of the vehicle body and extends from the engine 31 to the rear side. The exhaust pipe 80 is set in a manner along the side 21D and the inclined side 21E of the battery pack 20.

[0058] The cooling circuit 90 includes a compressor 91, a condenser 92, a storage tank 93, an expansion valve 94 (94A, 94B), cooling pipes 95A, 95B, and a plurality of refrigerant pipes 96A, 96B, 96C, 96D. The refrigerant circulates in the cooling circuit 90. The refrigerant flows in a flow direction C.

[0059] The expansion valve 94A is connected to a refrigerant pipe 96C and a cooling pipe 95A. The refrigerant pipe 96C is connected to the accumulator 93. The expansion valve 94B is connected to a refrigerant pipe 96C and a cooling pipe 95B. The expansion valves 94A and 94B are respectively housed in the housing case 21.

[0060] Cooling pipes 95A and 95B are disposed on the lower surface of the power storage module 22 to cool the power storage module 22 . Downstream ends of the cooling pipes 95A and 95B are connected to a refrigerant pipe 96D in the flow direction C. The refrigerant pipe 96D is connected to a compressor 91 provided outside the battery pack 20 .

[0061] The refrigerant pipe 96C and the refrigerant pipe 96D are respectively led out from the inside of the housing case 21 to the outside of the housing case 21. The refrigerant pipe 96C and the refrigerant pipe 96D are respectively led out from the front end surface 21A of the housing case 21 to the outside.

[0062] Figure 4 The top surface 21a is a plan view of the battery pack 20 as viewed from above. The battery pack 20 (housing case 21) includes an upper surface portion 21a. The upper surface portion 21a is a surface arranged to face upward. The upper surface portion 21a is aligned with the vehicle body bottom 50 (see FIG. 1 ) when the battery pack 20 (housing case 21) is installed in the vehicle 100. Figure 1 ) is set in the opposite direction.

[0063] The battery pack 20 includes a heat insulator 28. The heat insulator 28 is mounted on the upper surface portion 21a. Specifically, the heat insulator 28 is attached to the upper surface portion 21a by an adhesive material or a double-sided tape. The heat insulator 28 is formed in a sheet shape. In addition, the heat insulator 28 is an example of a "mounting member" disclosed in the present invention.

[0064] The upper surface portion 21 a is provided with a convex portion 21 b that protrudes toward the vehicle body bottom portion 50 (upward) when the battery pack 20 (housing case 21 ) is mounted on the vehicle 100 .

[0065] The heat insulator 28 has a hole 28a. The convex portion 21b of the upper surface portion 21a is inserted into the hole 28a. Specifically, the convex portion 21b penetrates the hole 28a and protrudes toward the vehicle body bottom 50 side from the heat insulator 28.

[0066] The heat insulator 28 is provided so as to surround the convex portion 21b. Specifically, the heat insulator 28 has no cutout portion (notch) and has an annular shape surrounding the convex portion 21b all around. In addition, the hole 28a is formed near the center of the heat insulator 28 when viewed from above.

[0067] The expansion valve 94 is disposed in the internal space of the housing case 21 corresponding to the convex portion 21b. The expansion valves 94A and 94B may be disposed in the internal space, or only one of the expansion valves 94A and 94B may be disposed. Figure 4 In the following description, the expansion valves 94A and 94B are not distinguished from each other and are described as the expansion valve 94 .

[0068] Figure 5 It is along Figure 4 The cross-sectional view of the VV line. Figure 5 As shown, an air guide portion 51 is formed between the convex portion 21b and the vehicle body bottom 50. The engine 31 (see Figure 1 )The heated air flows toward the rear side of the vehicle 100 through the air guide portion 51.

[0069] Furthermore, the vehicle 100 (vehicle body 10 ) includes an undercover 12 disposed below the battery pack 20 (housing case 21 ).

[0070] Figure 6 It is along Figure 5 The cross-sectional view of the VI-VI line. Figure 5 and Figure 6 As shown, the convex portion 21b is separated from the vehicle bottom 50. In other words, the convex portion 21b is provided on the battery pack 20 in a non-contact state with the vehicle bottom 50. Thus, even if the battery pack 20 is lifted upward due to interference with objects dropped from the vehicle 100, the reaction force from the vehicle bottom 50 is suppressed from being transmitted to the battery pack 20. In addition, the heat insulator 28 is also separated from the vehicle bottom 50.

[0071] Here, in conventional vehicles, when external forces (vibration load, impact load, chemical adhesion, etc.) are applied to the battery pack, components such as heat insulators may fall off the vehicle.

[0072] Therefore, in this embodiment, if Figure 7 As shown, the shortest distance D1 between the convex portion 21b and the vehicle bottom 50 is smaller than the minimum value tmin of the thickness t of the heat insulator 28. In addition, as described above, the convex portion 21b is separated from the vehicle bottom 50, so the shortest distance D1 is greater than zero.

[0073] In addition, Figure 7 In the illustrated example, the portion 21 c of the convex portion 21 b corresponding to the shortest distance D1 and the portion 28 b of the heat insulator 28 corresponding to the minimum value tmin are arranged side by side in the front-rear direction of the vehicle 100 .

[0074] Refer again Figure 4The heat insulating member 28 is arranged in the front-rear direction of the vehicle body 10 (vehicle body 10) at a position forward of the center Pm of the battery pack 20. In other words, the heat insulating member 28 is arranged in the front-rear direction at a position closer to the engine 31 than the center Pm of the battery pack 20 (refer to Figure 1 ) side.

[0075] Specifically, the heat insulator 28 is disposed between the side surface 21C and the inclined side surface 21E in the left-right direction of the vehicle 100. The inclined side surface 21E is provided on the front side relative to the center Pm.

[0076] As described above, in the present embodiment, the shortest distance D1 between the protrusion 21b and the bottom portion 50 of the vehicle body is smaller than the minimum value tmin of the thickness t of the heat insulating member 28. Thus, even the portion 28b of the heat insulating member 28 corresponding to the minimum value tmin cannot pass through the gap between the protrusion 21b (portion 21c) and the bottom portion 50 of the vehicle body corresponding to the shortest distance D1 described above. As a result, the protrusion 21b can be prevented from coming out of the hole 28a. Thus, the heat insulating member 28 can be prevented from falling off from the vehicle 100 (battery pack 20).

[0077] In the above embodiment, the heat insulator 28 is mounted on the battery pack 20 , but the present disclosure is not limited thereto. Instead of the heat insulator 28 , another member (eg, a buffer member) may be mounted on the battery pack 20 .

[0078] In the above embodiment, the heat insulator 28 is arranged forward of the center Pm of the battery pack 20 in the longitudinal direction of the vehicle 100, but the present disclosure is not limited thereto. The heat insulator 28 may be arranged rearward of the center Pm of the battery pack 20 in the longitudinal direction.

[0079] In the above embodiment, an example is shown in which the convex portion 21 b is separated from the vehicle bottom 50 , but the present disclosure is not limited thereto. The convex portion 21 b may be in contact with the vehicle bottom 50 .

[0080] In the above embodiment, an example is shown in which the expansion valve 94 is arranged in the space in the battery pack 20 corresponding to the convex portion 21b, but the present disclosure is not limited thereto. A component other than the expansion valve 94 may be arranged in the above space, or no component may be arranged. In addition, the convex portion may be formed by fixing a predetermined component to the upper surface portion 21a.

[0081] In the above embodiment, an example is shown in which the heat insulating material 28 surrounds the entire circumference of the protrusion 21b, but the present disclosure is not limited to this. The heat insulating material may not surround the entire circumference of the protrusion 21b. Figure 8In the example shown, the heat insulating member 128 is formed with a hole 128a into which the convex portion 21b is inserted, and a gap 128b. The gap 128b is formed continuously with the hole 128a and extends from the hole 128a toward the outer peripheral side. The gap 128b forms a notch in the heat insulating member 128. In addition, as described above, the convex portion 21b is provided with a gap with the shortest distance D1 (see Figure 7 ) corresponds to portion 21c. The shortest distance D2 between the portions of the heat insulating member 128 corresponding to the gap portion 128b (the shortest distance in the circumferential direction of the heat insulating member 128) is smaller than the minimum width W of portion 21c. In addition, the minimum width W refers to the minimum value of the width in the circumferential direction of the protrusion 21b (heat insulating member 128). Thus, it is possible to prevent the heat insulating member 128 from falling off from the vehicle (battery pack) due to the protrusion 21b passing through the gap portion 128b. In addition, the heat insulating member 128 is an example of an "installation component" disclosed in the present invention.

[0082] The embodiments disclosed herein are illustrative in all aspects and should not be construed as restrictive. The scope of the present disclosure is indicated by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims.

Claims

1. A vehicle comprising: a vehicle body, the vehicle body comprising an underbody; and a battery pack, the battery pack being mounted on the vehicle body below the bottom of the vehicle body, The battery pack comprises: an upper surface portion, the upper surface portion being arranged to face the bottom portion of the vehicle body; as well as a mounting member mounted on the upper surface portion, The upper surface portion is provided with a convex portion protruding toward the bottom side of the vehicle body, The mounting member is provided with a hole into which the protrusion is inserted. The shortest distance between the protrusion and the bottom portion of the vehicle body is smaller than a minimum value of a thickness of the mounting member.

2. The vehicle according to claim 1, The vehicle also has: Engine; and an exhaust pipe for exhausting gas exhausted from the engine, The exhaust pipe is arranged below the bottom of the vehicle body. The mounting member is a thermal insulator.

3. The vehicle according to claim 2, The mounting member is disposed forward of a center of the battery pack in a front-rear direction of the vehicle body.

4. The vehicle according to any one of claims 1 to 3, The protrusion is separated from the vehicle body bottom.

5. A battery pack, the battery pack being installed in a vehicle, The battery pack has: Battery modules; a housing portion that houses the battery module and includes an upper surface portion; and a mounting member mounted on the upper surface portion, The upper surface portion is provided so as to face the bottom of the vehicle body when the housing portion is mounted on the vehicle. The upper surface portion is provided with a convex portion that protrudes toward the bottom of the vehicle body when the receiving portion is mounted on the vehicle. The mounting member is provided with a hole into which the protrusion is inserted. When the receiving portion is mounted on the vehicle, the shortest distance between the protrusion and the vehicle body bottom is smaller than a minimum value of a thickness of the mounting member.

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