The lower structure of a hybrid vehicle

Abstract

This invention provides a lower structure for a hybrid electric vehicle, enabling the installation of onboard equipment (7) even in hybrid vehicles where a large battery unit (20) is mounted on the lower surface of the floor (11). The lower structure of the hybrid electric vehicle with a high-voltage battery unit mounted on the lower surface of the floor includes: an engine exhaust system component mounted on the lower surface of the floor, located in front of the high-voltage battery unit and on the side of the vehicle width direction relative to the center of the vehicle width; and a high-voltage device (30, 31) mounted on the lower surface of the floor, located in front of the high-voltage battery unit and on the side of the vehicle width direction relative to the center of the vehicle width. The onboard equipment is mounted between the high-voltage battery unit and the high-voltage device, and the onboard equipment is positioned such that its longitudinal dimension is shorter than its longitudinal dimension when the upper surface of the onboard equipment is horizontal, thus creating an inclined state where the upper surface is tilted in the longitudinal direction.

Description

Technical Field

[0001] This invention relates to a lower structure for a hybrid electric vehicle. Background Technology

[0002] Patent Document 1 discloses a hybrid vehicle. A high-voltage battery and an inverter, converter, etc., serving as high-voltage devices, are disposed on the lower surface of the floor of this hybrid vehicle. The high-voltage battery is a 48V battery and is disposed inside the passageway. The inverter and converter are arranged in a front-to-back direction in the left-side region of the passageway.

[0003] Patent document 2 discloses a vehicle battery support structure that supports a battery pack under the floor of a passenger vehicle that is a gasoline engine-electric hybrid vehicle. The battery pack is suspended on the left and right sides of the floor passage by brackets.

[0004] Patent document 3 discloses an electric vehicle. This electric vehicle has an exhaust pipe on the right side of the vehicle and a front drive motor and a generator motor on the opposite left side. Furthermore, with the exhaust pipe located on the left side of the vehicle, the front drive motor and generator motor are located on the opposite right side. Therefore, the front drive motor and generator motor are not affected by heat transferred from the exhaust pipe.

[0005] Existing technical documents

[0006] Patent documents

[0007] Patent Document 1: Japanese Patent Application Publication No. 2020-172879

[0008] Patent Document 2: Japanese Patent Application Publication No. 2013-067334

[0009] Patent Document 3: Japanese Patent Application Publication No. 2016-002772

[0010] The technical problem that the invention aims to solve

[0011] However, high-voltage devices such as inverters and converters, on-board equipment, battery cells, and engine exhaust system components are located on the lower surface of the floor in hybrid vehicles. Therefore, it is necessary to protect these high-voltage devices and on-board equipment from heat damage caused by the engine exhaust system components. Furthermore, to increase the electric driving range of hybrid vehicles, large battery cells may be installed. However, when large battery cells are installed on the lower surface of the floor, it is difficult to ensure sufficient space for installing on-board equipment there. Summary of the Invention

[0012] Therefore, the present invention provides a structure that enables onboard equipment to be installed even in hybrid vehicles with large battery cells mounted on the lower surface of the floor.

[0013] Technical means for solving technical problems

[0014] In order to achieve the above-mentioned objective, the present invention provides a high-voltage device in front of the high-voltage battery cell and an on-board device is arranged between the high-voltage battery cell and the high-voltage device in an inclined state with the upper surface tilted in the front-rear direction.

[0015] Specifically, the hybrid vehicle disclosed here has a high-voltage battery unit mounted on the lower surface of the floor in its substructure, and features:

[0016] An engine exhaust system component, disposed on the lower surface of the floor, in front of the high-voltage battery cell and on one side relative to the vehicle width direction center; and

[0017] A high-voltage device is disposed on the lower surface of the floor, in front of the high-voltage battery cell and on the opposite side of the vehicle width direction compared to the center of the vehicle width direction.

[0018] A vehicle-mounted device is installed between the high-voltage battery unit and the high-voltage device.

[0019] The vehicle-mounted device is in a tilted state in the front-to-back direction, with its front-to-back dimension being shorter than the front-to-back dimension of its upper surface when it is in a horizontal state.

[0020] According to this structure, by tilting the on-board equipment, it can be installed in the narrow space between the high-voltage battery cell and the high-voltage device. Therefore, even if a large battery cell is installed to ensure sufficient electric driving range, the on-board equipment can still be installed on the lower surface of the floor. Furthermore, the engine exhaust system components, the high-voltage device, and the on-board equipment are positioned on opposite sides of the vehicle width, separated by the center of the vehicle width. This protects the high-voltage device and the on-board equipment from thermal damage caused by the heat from the engine exhaust system components.

[0021] In one embodiment, the high-voltage battery cell is positioned rearwards from the vehicle's rearward side, with the lower portion of its front surface located relative to the upper portion of the front surface.

[0022] The on-board equipment is in an inclined state where the upper surface is tilted downwards towards the rear of the vehicle with the rear end lower than the front end.

[0023] The rear end face of the upper surface of the vehicle-mounted device faces the lower part of the front surface of the high-voltage battery cell.

[0024] Therefore, by setting the lower part of the front surface of the high-voltage battery cell back relative to the upper part of the front surface, a space is created in front of the lower part of the front surface. This space allows the rear end of the upper surface of the tilted vehicle-mounted device to face the lower part of the front surface of the high-voltage battery cell. By arranging it in this way, the vehicle-mounted device can be compactly installed in the narrow space between the high-voltage battery cell and the high-voltage device.

[0025] In one embodiment, the vehicle-mounted equipment is fixed to a mounting plate whose upper surface slopes downward toward the rear of the vehicle, and is supported on the floor via this mounting plate.

[0026] The rear end of the upper surface of the mounting plate faces the lower part of the front surface of the high-voltage battery cell.

[0027] When the mounting plate and onboard equipment move rearward due to a frontal collision, the upper surface of the mounting plate first contacts the upper front surface of the high-voltage battery cell. At this time, the upper front surface of the high-voltage battery cell contacts the inclined upper surface of the mounting plate in a relatively sliding manner. This mitigates the impact on the high-voltage battery cell and onboard equipment caused by a frontal collision.

[0028] Furthermore, when the on-board equipment moves rearward due to a frontal collision, it slides relative to the upper surface of the front surface of the high-voltage battery cell and the inclined upper surface of the mounting plate, thereby guiding the mounting plate and the on-board equipment to descend towards the rear of the vehicle. This allows the mounting plate and the on-board equipment to recede into the space created by the rearward movement of the lower part of the front surface of the high-voltage battery cell.

[0029] In one embodiment, the high-voltage battery cell has a wiring harness connection portion on the lower part of the front surface.

[0030] Therefore, the wiring harness can be connected to the high-voltage battery cell by utilizing the space created by the retraction of the lower part of the front surface of the high-voltage battery cell. This allows for a compact electrical connection to the high-voltage battery cell.

[0031] In one embodiment, the vehicle-mounted device is a high-voltage device that is powered from the wiring harness connection via a wiring harness.

[0032] This allows for a shorter wiring harness used to supply power to onboard equipment, resulting in more compact electrical connections.

[0033] In one embodiment, the high-voltage device is a PTC heater for electrically heating engine cooling water.

[0034] The effects of the invention

[0035] According to the present invention, the engine exhaust system components, the vehicle-mounted equipment, and the high-voltage device are respectively disposed on opposite sides of the vehicle width direction, separated by the center in the vehicle width direction. Therefore, the vehicle-mounted equipment and the high-voltage device can be protected from thermal damage caused by the engine exhaust system components. Furthermore, by arranging the vehicle-mounted equipment in an inclined position, it can be installed in the narrow space between the high-voltage battery cell and the high-voltage device. Therefore, even if the space on the lower surface of the floor becomes narrow due to the placement of a large high-voltage battery cell, the vehicle-mounted equipment can still be installed. Attached Figure Description

[0036] Figure 1 This is a lower surface view of the lower structure of a hybrid vehicle.

[0037] Figure 2 yes Figure 1 Enlarged view of the main parts.

[0038] Figure 3 yes Figure 2 A cross-sectional view at line III-III.

[0039] Figure 4 It is equivalent to omitting the converter. Figure 2 The image.

[0040] Figure 5 It means Figure 4 A diagram of the main parts of the whole.

[0041] Figure 6 Viewed from the lower left Figure 5 A three-dimensional image.

[0042] Figure 7 Viewed from the upper left Figure 5 A three-dimensional image.

[0043] Figure 8 Viewed from above Figure 5 The top surface diagram.

[0044] Figure 9 It is equivalent to omitting the PTC heater. Figure 5 The image.

[0045] Figure 10 It is equivalent to omitting the PTC heater. Figure 6 The image.

[0046] Symbol Explanation

[0047] 1. Hybrid vehicles

[0048] 5. High-voltage device mounting bracket

[0049] 6. Purification device

[0050] 7 PTC heaters

[0051] 8 Mounting Plate

[0052] 11 Floor

[0053] 12. Passage Department

[0054] 20 High-voltage battery cells

[0055] 21 Left battery unit

[0056] 22 Right side battery unit

[0057] 210 Front surface

[0058] 211 Upper front surface

[0059] 212 Lower front surface

[0060] 213 IV Wire Harness Connection

[0061] 214 Wire Harness Connection

[0062] 30 Inverters

[0063] 31 Converter Detailed Implementation

[0064] Hereinafter, embodiments of the present invention will be described in detail based on the accompanying drawings. The following description of preferred embodiments is merely illustrative and is not intended to limit the application or use of the present invention.

[0065] <Substructure of Hybrid Electric Vehicles>

[0066] Figure 1 The lower structure of a hybrid vehicle 1 according to an embodiment of the present invention is shown. Figure 1 In the diagram, the vertical direction represents the vehicle width, the left side represents the front of the vehicle, the right side represents the rear of the vehicle, the inner side of the paper represents the top, and the front side of the paper represents the bottom. Side beams 10 extending in the longitudinal direction are provided at both ends of the hybrid vehicle 1 in the vehicle width direction. A generally horizontal floor 11 is arranged inside these side beams 10 in the vehicle width direction. At the center of the floor 11 in the vehicle width direction, an upward-facing recessed passage portion 12 extends in the longitudinal direction. Floor side frames 13 extending in the longitudinal direction are respectively provided between each side beam 10 and the passage portion 12 in the floor 11.

[0067] like Figure 1As shown, high-voltage battery units 20 supplying power to the vehicle drive motor are arranged on both sides of the passage portion 12 in the vehicle width direction on the lower surface of the floor 11 of the hybrid vehicle 1. The high-voltage battery units 20 consist of a left and right pair: a left battery unit 21 is arranged on the left side (upper side in the figure) in the vehicle width direction, and a right battery unit 22 is arranged on the right side (lower side in the figure) in the vehicle width direction. These left and right battery units 21 and 22 are, for example, lithium-ion batteries, and are high-voltage DC power supplies. The left and right battery units 21 and 22 are mounted on the floor side frame 13 and the passage side frame 14 forming the passage portion 12.

[0068] like Figure 2 As shown, in the front portion of the left battery cell 21 (left side in the figure), the outer side (upper side in the figure) in the vehicle width direction protrudes forward compared to the inner side (lower side in the figure) in the vehicle width direction. A front surface portion 210 facing forward of the vehicle is formed in this protruding portion. An IV (inverter) wiring harness connection portion 213 is provided on the inner side in the vehicle width direction where it does not protrude forward. Figure 3 As shown, the front surface portion 210 of the left battery cell 21 is positioned rearward of the front surface lower portion 212 compared to the front surface upper portion 211, which is located at the rear of the vehicle. The front surface upper portion 211 is configured to be orthogonal to the vehicle's longitudinal direction. Furthermore, the front surface lower portion 212 is angled in the vehicle's longitudinal direction, with its lower end positioned rearward compared to its upper end. A wiring harness connection portion 214 is provided on the front surface lower portion 212 of the left battery cell 21. Four wiring harnesses can be connected to this wiring harness connection portion 214.

[0069] <Purification Device>

[0070] like Figure 1 As shown, on the lower surface of the floor 11, which extends to the right side of the passageway 12 in the vehicle width direction, a purification device 6, serving as an exhaust system component for the vehicle's driving engine, is disposed in front of the right-side battery unit 22. This purification device 6 is a component used to purify the engine exhaust passing through it using a catalyst. The purification device 6 generates heat as the exhaust passes through it is purified.

[0071] A front exhaust pipe 61 extending towards the front of the vehicle is connected to the front of the purification device 6. The front end of the front exhaust pipe 61 is connected to the exhaust manifold of the engine. In addition, a rear exhaust pipe 62 extending towards the rear of the vehicle is connected to the rear of the purification device 6. The rear exhaust pipe 62 extends towards the rear of the vehicle and is inclined towards the center in the width direction, and extends rearward through the passage portion 12.

[0072] <Inverters and Converters>

[0073] like Figure 1As shown, an inverter 30 and a converter 31, serving as high-voltage devices, are arranged in front of the left-side battery unit 21. These inverters 30 and converters 31 are positioned across the passage 12 on the side opposite to the aforementioned purification device 6 in the vehicle width direction. This protects these inverters 30 and converters 31 from heat damage caused by the heat emitted by the purification device 6.

[0074] like Figure 3 As shown, these inverters 30 and converters 31 are mounted across the floor-side frame 13 and the channel-side frame 14 via the high-voltage device mounting bracket 5 in an overlapping configuration. The inverters 30 and converters 31 are rectangular boxes with dimensions longer in the longitudinal and transverse directions than in the thickness. The longitudinal dimension of the inverters 30 and converters 31 is longer than their transverse dimension. The transverse dimensions of these inverters 30 and converters 31 are approximately the same. Furthermore, the longitudinal dimension of the inverter 30 is longer than the longitudinal dimension of the converter 31.

[0075] Although not shown, three switching circuits are built into the inverter 30, arranged horizontally in a row. Through switching operations in these circuits, the inverter 30 outputs controlled three-phase AC power to the motor. By controlling the inverter 30, the motor drives the vehicle with a predetermined output.

[0076] like Figure 1 and Figure 2 As shown, the inverter 30 has an inverter-side connection portion 301 for connecting the IV harness 40 to its front and rear ends. The front inverter-side connection portion 301 is connected to a motor or the like via the IV harness 40. Additionally, the rear inverter-side connection portion 301 is connected to the IV harness connection portion 213 of the left-side battery cell 21 via the IV harness 40.

[0077] Converter 31 is used to step down the DC voltage of the high-voltage battery cell 20 (a so-called DC / DC converter). Although not shown, converter 31 contains a step-down circuit including IGBTs, multiple switching elements, capacitors, and coils. Converter 31 can step down the voltage of the DC current by controlling the switching elements to turn them on and off.

[0078] like Figure 1 and Figure 2 As shown, the converter 31 has converter-side connection portions 311 on both sides of its vehicle width direction (vertical direction in the figure) for connecting the CV (converter) wiring harness 41. The converter-side connection portion 311 on the right side (lower side in the figure) is connected to the wiring harness connection portion 214 of the battery unit 21 on the left side via the CV wiring harness 41. In addition, the output CV wiring harness 41 is connected to the converter-side connection portion 311 on the left side (upper side in the figure).

[0079] <High Voltage Equipment Mounting Bracket>

[0080] 0034 As described above, the inverter 30 and converter 31 are mounted across the floor-side frame 13 and the channel-side frame 14 with their top and bottom overlapping via the high-voltage device mounting bracket 5. Figures 5-8 The high-voltage device mounting bracket 5 is shown. The high-voltage device mounting bracket 5 is formed by stamping a metal sheet.

[0081] The high-voltage device mounting bracket 5 consists of an upper bracket 51 and a lower bracket 52. For example... Figure 5 and Figure 6 As shown, when viewed from above, the lower support 52 has a roughly rectangular shape that is longer in the left-right direction than in the front-back direction. Figures 7-8 As shown, when viewed from above and below, the upper support 51 has an approximately L-shaped profile.

[0082] The upper support 51 and the lower support 52 are respectively formed with a specified bending structure and a specified concave-convex structure. These bending structures and concave-convex structures enhance the rigidity of the upper support 51 and the lower support 52.

[0083] The upper bracket 51 has an upper inner mounting portion 511 extending in the front-rear direction and a mounting portion 512 extending from the front end of the upper inner mounting portion 511 in the vehicle width direction. An upper outer mounting portion 513 is provided at the protruding end of the mounting portion 512. Multiple fastening seats for fastening mounting bolts are provided in the upper inner mounting portion 511 and the upper outer mounting portion 513.

[0084] The lower bracket 52 has a generally rectangular plate-shaped base plate portion 521 and a lower outer mounting portion 522 located at the outer end of the base plate portion 521 in the vehicle width direction along its long side. The lower outer mounting portion 522 is provided with multiple fastening seats for fastening mounting bolts. These upper brackets 51 and lower brackets 52 are integrated by bolt fastening them together in a vertically opposite state.

[0085] The upper inner mounting part 511 is mounted to the channel side frame 14 via a fastening seat and mounting bolts. Similarly, the upper outer mounting part 513 is mounted to the floor side frame 13 via a fastening seat and mounting bolts. Thus, the high-voltage device mounting bracket 5 is mounted on the lower surface of the floor 11.

[0086] like Figure 3As shown, an inverter 30 is disposed between the upper bracket 51 and the lower bracket 52. The inverter 30 is mounted on the base plate 521 and fastened with bolts. In addition, a converter 31 is fastened to the lower surface of the lower bracket 52 by mounting bolts. In this way, the inverter 30 and the converter 31 are mounted across the floor side frame 13 and the channel side frame 14 in an overlapping state.

[0087] <PTC heater>

[0088] like Figure 1 and Figure 2 As shown, a PTC heater 7, serving as an on-board device, is disposed between the left-side battery unit 21 and the inverter 30 and converter 31. The PTC heater 7 is used to electrically heat the engine coolant. The engine coolant heated by the PTC heater 7 is used in the heater of the air conditioner of the hybrid vehicle 1, etc. The PTC heater 7 is disposed on the side opposite to the purification device 6 in the vehicle width direction, separated by the passage portion 12. This protects the PTC heater 7 from heat damage caused by the heat emitted by the purification device 6.

[0089] like Figure 3 As shown, the PTC heater 7 has a rectangular box-shaped heater section 71. In a horizontal state where the upper surface of the PTC heater 7 is level, the longitudinal and transverse dimensions of the heater section 71 are longer than its thickness. Furthermore, a box section 72 is provided at the lower part of the heater section 71. The longitudinal dimension of the box section 72 is shorter than that of the heater section 71, while its thickness is longer than that of the heater section 71. Therefore, in a horizontal state, the longitudinal dimension of the PTC heater 7 is longer than its thickness.

[0090] like Figures 3-5 As shown, the heater section 71 of the PTC heater 7 has a heater-side connection section 711 at the lower part for connecting the heater wiring harness 42 to the front side. The heater-side connection section 711 is connected to the wiring harness connection section 214 of the left battery cell 21 via the heater wiring harness 42. That is, the PTC heater 7 is a high-voltage device that operates by being powered from the high-voltage battery cell 20 via the heater wiring harness 42.

[0091] like Figure 4 and Figure 5 As shown, on the outer side of the box portion 72 of the PTC heater 7 in the vehicle width direction ( Figure 5 The upper part (in the middle) has water distribution pipe connection parts 721, 721 at two locations. Water distribution pipes 73, 73 for circulating engine cooling water are respectively connected to these water distribution pipe connection parts 721. Engine cooling water is supplied to the housing 72 through one of these water distribution pipes 73, and engine cooling water is discharged from the housing 72 through the other.

[0092] like Figure 3 As shown, the PTC heater 7 is configured to be located at the rear end of the upper surface of the heater section 71. Figure 3 The middle is the right side) and the front end ( Figure 3 The PTC heater 7 is tilted downwards in a lower position compared to the left side of the heater 71, and is tilted towards the front and rear of the vehicle. The front and rear dimensions of the PTC heater 7 in this tilted position are shorter than those of the PTC heater 7 in the horizontal position where the upper surface of the heater section 71 is horizontal. The rear end of the upper surface of the tilted heater section 71 faces the lower part 212 of the front surface of the left battery cell 21.

[0093] In this way, by tilting the PTC heater 7 so that its rear end face faces the lower part 212 of the front surface of the left battery cell 21, the PTC heater 7 can be compactly arranged in the narrow space between the left battery cell 21 and the inverter 30 and converter 31. Furthermore, a wiring harness connection portion 214 is provided on the lower part 212 of the front surface of the left battery cell 21, which is facing the PTC heater 7. Therefore, the distance between the PTC heater 7 and the wiring harness connection portion 214 is short, which shortens the length of the heater wiring harness 42 connecting the PTC heater 7 to the wiring harness connection portion 214 of the left battery cell 21. This allows for a compact electrical connection between the PTC heater 7 and the left battery cell 21.

[0094] <Mounting Plate>

[0095] like Figure 3 , Figure 7 and Figure 8 As shown, a mounting plate 8 is fixed to the upper part of the PTC heater 7 to support the PTC heater 7 on the lower surface of the floor 11. The mounting plate 8 is installed in a way that the upper surface of the mounting plate 8 is tilted downward toward the rear of the vehicle by taking advantage of the tilt of the upper part of the PTC heater 7. The rear end face of the upper surface of the mounting plate faces the lower part 212 of the front surface of the left battery cell 21.

[0096] like Figures 7-10 As shown, the mounting plate 8 is rectangular. Bending portions 81 are formed on both sides of the mounting plate 8 in the vehicle width direction, bending downwards at right angles relative to the upper surface of the mounting plate 8. A fixing portion 82 extending outwards is formed at the lower end of each of these bending portions 81. The PTC heater 7 is mounted to each of these fixing portions 82 via mounting bolts. Thus, the PTC heater 7 is fixed to the mounting plate 8.

[0097] like Figure 9 and Figure 10As shown, the inner end of the fixing part 82, located on the inner side in the vehicle width direction, is bent downwards to form an inner end 83. A plate-shaped inner mounting plate 84, extending downwards and inclined at its upper part along the inclination of the mounting plate 8, is provided at this inner end 83. Figure 9 As shown, in front of the inner mounting plate 84 ( Figure 9 The left end of the middle section is provided with an outer side in the vehicle width direction ( Figure 9 The upper part (center) is a curved section 841. An inner mounting plate fastening part 842 extending forward is provided at the lower end of the front end of the curved section 841. The inner mounting plate fastening part 842 is mounted to the lower bracket 52 of the high voltage device mounting bracket 5 by mounting bolts.

[0098] In addition, such as Figure 3 and Figure 7 As shown, a front bracket 85 is provided on the front side of the upper surface of the mounting plate 8. Figure 3 As shown, the front bracket 85 of the plate has a front fixing portion 851 fixed to the upper surface of the heater section 71. A U-shaped portion 852, which is approximately U-shaped and bends downwards and outwards when viewed from the vehicle width direction, is provided at the front end of the front fixing portion 851. Furthermore, a front bracket fastening portion 853 extending forward is provided at the lower end of the U-shaped portion 852. The front bracket fastening portion 853 is mounted to the lower bracket 52 of the high-voltage device mounting bracket 5 and is installed by bolts.

[0099] like Figure 7 and Figure 8 As shown, on the inner side of the mounting plate 8 in the vehicle width direction ( Figure 8 An inner support 86 is provided on the upper side of the plate. For example... Figure 7 As shown, the inner bracket 86 of the plate has an L-shaped portion 861 that is bent in a roughly L-shape when viewed from the vehicle width direction. An inner bracket fixing portion 862 that is fixed to the upper surface of the mounting plate 8 is provided at the outer end of the L-shaped portion 861 in the vehicle width direction. The inner end of the L-shaped portion 861 in the vehicle width direction extends to the lower side of the rear end of the upper inner mounting portion 511 of the high voltage device mounting bracket 5, and is mounted to the rear end of the upper inner mounting portion 511 by mounting bolts.

[0100] <Protection of the mounting plate for the PTC heater>

[0101] use Figure 3 The protection provided by the mounting plate 8 for the PTC heater 7 will be explained. The mounting plate 8 of this invention protects the PTC heater 7 from impact during a vehicle collision (frontal collision).

[0102] In the event of a collision with the hybrid vehicle 1, the mounting plate 8 and the PTC heater 7 are pushed rearward by the impact. Figure 3 (The middle is the right side) moves. For example... Figure 3As shown, the rear end face of the upper surface of the mounting plate 8 faces the lower part 212 of the front surface of the left battery cell 21, thus the upper surface of the mounting plate 8 is opposite to the upper part 211 of the front surface of the left battery cell 21. Therefore, when the mounting plate 8 and the PTC heater 7 move rearward, the upper part 211 of the front surface of the left battery cell 21 contacts the upper surface of the mounting plate 8. At this time, the upper part 211 of the front surface of the left battery cell 21 contacts the upper surface of the mounting plate 8 in a sliding manner along the inclination of the mounting plate 8. Since the contact is in a sliding manner, the impact on the left battery cell 21 and the PTC heater 7 can be mitigated by this contact.

[0103] Furthermore, by sliding the upper part 211 of the front surface of the left battery unit 21 relative to the upper surface of the mounting plate 8, the mounting plate 8 and the PTC heater 7 are guided to descend toward the rear of the vehicle. As a result, the mounting plate 8 and the PTC heater 7, which would have moved rearward due to a vehicle collision, can be retracted into the space created by the retraction of the lower part 212 of the front surface of the left battery unit 21.

Claims

1. A lower structure for a hybrid electric vehicle, wherein a high-voltage battery unit is disposed on the lower surface of the floor, characterized in that, have: An engine exhaust system component is disposed on the lower surface of the floor in front of the high-voltage battery cell and on the side in the vehicle width direction relative to the center of the vehicle width direction. as well as A high-voltage device is disposed on the lower surface of the floor, in front of the high-voltage battery cell and on the opposite side of the vehicle width direction compared to the center of the vehicle width direction. A vehicle-mounted device is installed between the high-voltage battery unit and the high-voltage device. The vehicle-mounted device is in a tilted state where its front-to-back dimension is shorter than its front-to-back dimension when the upper surface of the vehicle-mounted device is in a horizontal state. The high-voltage battery cell is positioned rearwards from the vehicle by placing the lower part of its front surface relative to the upper part of the front surface. The on-board equipment is in an inclined state where the upper surface is tilted downwards towards the rear of the vehicle with the rear end lower than the front end. The rear end face of the upper surface of the vehicle-mounted device faces the lower part of the front surface of the high-voltage battery cell.

2. The lower structure of the hybrid electric vehicle according to claim 1, characterized in that, The vehicle-mounted equipment is fixed to a mounting plate whose upper surface slopes downwards towards the rear of the vehicle, and is supported on the floor via this mounting plate. The rear end of the upper surface of the mounting plate faces the lower part of the front surface of the high-voltage battery cell.

3. The lower structure of the hybrid electric vehicle according to claim 2, characterized in that, The high-voltage battery cell has a wiring harness connection portion on the lower part of its front surface.

4. The lower structure of the hybrid electric vehicle according to claim 3, characterized in that, The on-board equipment is a high-voltage device that is powered from the wiring harness connection via a wiring harness.

5. The lower structure of the hybrid electric vehicle according to claim 4, characterized in that, The high-voltage device is a PTC heater used for electrically heating engine cooling water.

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