Vehicle lower structure

Abstract

The present invention relates to a vehicle lower structure, comprising: a shell body, which is arranged on the lower side of the vehicle and has a battery mounted on a mounting portion; a refrigerant flow path, which is arranged on the lower side of the vehicle of the shell body and can perform heat exchange between the battery on the mounting portion and the refrigerant; and an inlet and outlet portion, which is connected to the refrigerant flow path from the upper side of the vehicle and can allow the refrigerant to flow in or out between the outside of the refrigerant flow path and the refrigerant flow path.

Description

Technical Field

[0001] The present disclosure relates to a vehicle lower structure in which a housing of a battery is arranged on a vehicle lower side of a vehicle. Background Art

[0002] For example, in the underfloor unit disclosed in Japanese Patent Publication No. 2015-224027, the cross-sectional shape of the cooling duct is, for example, set to a roughly U-shape that opens to the upper side of the vehicle. A support plate constituting a base body is arranged on the open side of the cooling duct, and the open side of the cooling duct is closed by the support plate. In addition, the base body has a roughly flat armor plate (protective member). In a first embodiment of Japanese Patent Publication No. 2015-224027, a cooling duct is arranged on the inner side of a groove formed in the armor plate, and in a second embodiment of Japanese Patent Publication No. 2015-224027, a cooling duct is arranged on the armor plate.

[0003] However, in such an underfloor unit, a supply unit for supplying refrigerant from the outside of the cooling duct to the cooling duct or a delivery unit for delivering refrigerant in the cooling duct to the outside of the cooling duct must be provided. However, by providing the supply unit or the delivery unit, the vertical dimension of the underfloor unit becomes larger, making it difficult to ensure the ground height from the road surface to the underfloor unit. Summary of the invention

[0004] The present disclosure takes the above-mentioned facts into consideration, and an object of the present disclosure is to obtain a vehicle lower structure capable of ensuring a sufficient height above the ground from the road surface to the refrigerant flow path.

[0005] The lower vehicle structure of the first scheme of the present disclosure comprises: a shell body, which is arranged on the lower side of the vehicle and has a battery mounted on a mounting portion; a refrigerant flow path, which is arranged on the lower side of the vehicle of the shell body and can perform heat exchange between the battery on the mounting portion and the refrigerant; and an inlet and outlet portion, which is connected to the refrigerant flow path from the upper side of the vehicle and can allow the refrigerant to flow in or out between the outside of the refrigerant flow path and the refrigerant flow path.

[0006] According to the vehicle lower structure of the first aspect of the present disclosure, a battery is placed on the mounting portion of the housing, a flow path of a coolant is set on the vehicle lower side of the mounting portion, and the battery is cooled when heat is exchanged between the coolant flowing in the flow path and the battery on the mounting portion of the housing.

[0007] In addition, the inflow and outflow parts are connected to the refrigerant flow path from the upper side of the vehicle, and the refrigerant flows into the refrigerant flow path from the upper side of the vehicle through the inflow and outflow parts, or the refrigerant flows out from the refrigerant flow path to the upper side of the vehicle through the inflow and outflow parts. In this way, the inflow and outflow parts are connected to the refrigerant flow path from the upper side of the vehicle. Therefore, the ground height from the road surface can be ensured.

[0008] The vehicle lower structure of the second scheme of the present disclosure is based on the vehicle lower structure described in the first scheme of the present disclosure, and includes a frame that is arranged on at least one of the outer sides of the shell in the vehicle front-rear direction and the outer sides of the shell in the vehicle left-right direction to reinforce the shell, and the inflow and outflow part is set on at least one of the outer sides of the vehicle front-rear direction and the outer sides of the vehicle left-right direction relative to the frame.

[0009] According to the vehicle lower structure of the second scheme of the present disclosure, a frame is provided on at least one of the outer sides of the housing in the vehicle front-rear direction and the outer sides in the vehicle left-right direction. Thus, the housing is reinforced by the frame. In addition, the inflow and outflow parts are provided on at least one of the outer sides in the vehicle front-rear direction and the outer sides in the vehicle left-right direction relative to the frame. Thus, the ground height from the road surface can be further effectively ensured.

[0010] A vehicle lower structure according to a third aspect of the present disclosure is the vehicle lower structure according to the second aspect of the present disclosure, wherein each of the frame and the inflow and outflow portion is provided on the vehicle front side of the housing.

[0011] In the vehicle lower structure of the third embodiment of the present disclosure, the frame and the inflow and outflow parts are respectively arranged on the vehicle front side of the housing. Here, in a general vehicle, a refrigerant flow path is arranged on the vehicle rear side of a radiator (heat exchanger) or the like, so that the inflow and outflow parts are easily connected to the radiator (heat exchanger) or the like.

[0012] A vehicle lower structure according to a fourth aspect of the present disclosure is the vehicle lower structure according to any one of the first aspect to the third aspect of the present disclosure, wherein the coolant flow path includes an extension portion extending toward the inflow and outflow portion.

[0013] According to the fourth aspect of the vehicle lower structure of the present disclosure, the refrigerant flow path includes an extension portion extending toward the inlet and outlet portion. Therefore, the inlet and outlet portion may be opened on the vehicle upper side of the extension portion. Therefore, the structure of the inlet and outlet portion can be simplified.

[0014] The vehicle lower structure of the fifth scheme of the present disclosure is based on the vehicle lower structure of the fourth scheme of the present disclosure, wherein the refrigerant flow path and the vehicle upper side portions of the extension portion are opened, the opening of the refrigerant flow path on the vehicle upper side is closed by the loading portion, and the portion of the opening of the extension portion on the vehicle upper side that does not overlap with the loading portion in the vehicle upper and lower directions is closed by a plate portion.

[0015] According to the lower vehicle structure of the fifth scheme of the present disclosure, the refrigerant flow path and the extension portion are partially opened on the upper side of the vehicle. The opening on the upper side of the refrigerant flow path is closed by the mounting portion of the shell. Therefore, the number of components between the battery and the refrigerant can be reduced, and the cooling efficiency of the battery is improved. On the other hand, the opening on the upper side of the extension portion is closed by the plate portion. Therefore, the extension portion and the refrigerant flow path can be integrated, and the structure of the refrigerant flow path and the extension portion can be simplified.

[0016] As described above, in the vehicle lower structure according to the first aspect of the present disclosure, since the ground height from the road surface can be ensured, the transmission of the load to the flow path of the refrigerant can be suppressed.

[0017] In addition, in the vehicle lower structure according to the second aspect of the present disclosure, since the height above the road surface can be more effectively ensured, the transmission of the load to the flow path of the refrigerant can be more effectively suppressed.

[0018] Furthermore, in the vehicle lower structure according to the third aspect of the present disclosure, it is possible to facilitate communication of the inflow and outflow portion with a radiator (heat exchanger) or the like disposed on the vehicle front side of the refrigerant flow path.

[0019] Furthermore, in the vehicle lower structure according to the fourth aspect of the present disclosure, the structure of the inflow and outflow portion can be simplified.

[0020] Furthermore, in the vehicle lower structure according to the fifth aspect of the present disclosure, the cooling efficiency of the battery can be improved, and the structures of the coolant flow path and the extension portion can be simplified. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The structure of the vehicle front side portion of the vehicle lower structure according to one embodiment of the present disclosure is shown along the Figure 2 A cross-sectional view of line 1-1.

[0022] Figure 2 It is an exploded perspective view showing a vehicle lower structure according to an embodiment of the present disclosure.

[0023] Description of symbols

[0024] 14 Shell

[0025] 16 Frames

[0026] 18 Pallets

[0027] 42 Tray bottom (refrigerant flow path, loading part)

[0028] 58 first plate (refrigerant flow path)

[0029] 70 Coolant (refrigerant)

[0030] 80 extension

[0031] 82 Second board (board part)

[0032] 88 Inflow and outflow DETAILED DESCRIPTION

[0033] Next, based on Figure 1 and Figure 2 The vehicle lower structure of one embodiment of the present disclosure is explained in the following figures. Figure 1 and Figure 2 The arrow FR shown appropriately in the figure indicates the front side (vehicle front side) of the vehicle to which the vehicle lower structure is applied. In addition, the arrow UP indicates the upper side of the vehicle, and the arrow LH indicates the left side of the vehicle (the left side in the vehicle width direction).

[0034] <Structure of this embodiment>

[0035] like Figure 1 and Figure 2 As shown, the lower structure of the vehicle of the present embodiment includes a battery unit 12. The battery unit 12 includes a housing 14. The housing 14 is configured to include a frame 16 and a tray 18. The frame 16 is formed of a metal such as aluminum or an alloy including aluminum. The frame 16 includes a frame body 20, and the frame body 20 includes a frame bottom 22. The frame bottom 22 is formed into a rectangular flat plate shape when viewed from the upper and lower sides of the vehicle. In addition, a hole portion 24 is formed on the central side of the frame bottom 22. The hole portion 24 is set to be rectangular when viewed from above. Therefore, the frame bottom 22 is set to be a rectangular frame shape when viewed from above.

[0036] A frame vertical wall 26 is erected from the outer peripheral portion of the frame bottom 22 toward the substantially upper side of the vehicle. A frame flange 28 extends from the end portion of the frame vertical wall 26 on the vehicle front side toward the vehicle front side, and a frame flange 28 extends from the end portion of the frame vertical wall 26 on the vehicle rear side toward the vehicle rear side. In addition, a frame flange 28 extends from the end portion of the frame vertical wall 26 on the vehicle left side toward the vehicle left side, and a frame flange 28 extends from the end portion of the frame vertical wall 26 on the vehicle right side toward the vehicle right side.

[0037] In addition, the frame 16 includes a front frame 30 and a rear frame 32. The front frame 30 is also provided on the vehicle lower side of the frame flange 28 on the vehicle front side, and the rear frame 32 is also provided on the vehicle lower side of the frame flange 28 on the vehicle rear side. The longitudinal direction of the front frame 30 and the rear frame 32 is substantially set to the vehicle width direction. These frame flanges 28 are directly or indirectly connected to the floor from the vehicle lower side of the floor constituting the vehicle body, for example. Thus, the housing 14 is attached to the vehicle body.

[0038] like Figure 1As shown, the cross-sectional shape of each of the front frame 30 and the rear frame 32 when cut in a direction perpendicular to the vehicle width direction is set to a hollow shape. The front frame 30 forms a closed cross-sectional shape together with the frame longitudinal wall 26 on the front side of the vehicle, and the rear frame 32 forms a closed cross-sectional shape together with the frame longitudinal wall 26 on the rear side of the vehicle. In addition, a middle wall 34 is provided inside each of the front frame 30 and the rear frame 32, and the space inside each of the front frame 30 and the rear frame 32 is divided into two in the vehicle vertical direction by the middle wall 34 (the middle wall 34 of the rear frame 32 is omitted in the figure).

[0039] In addition, if Figure 2 As shown, the frame 16 includes a pair of side frames 36. One side frame 36 is also provided on the vehicle lower side of the frame flange 28 on the vehicle left side, and the other side frame 36 is also provided on the vehicle lower side of the frame flange 28 on the vehicle right side. The longitudinal direction of these side frames 36 is generally set to the vehicle front-rear direction.

[0040] Each of the side frames 36 has a hollow cross-sectional shape when cut in a direction perpendicular to the front-rear direction of the vehicle. One side frame 36 forms a closed cross-sectional shape together with the frame longitudinal wall 26 on the left side of the vehicle, and the other side frame 36 forms a closed cross-sectional shape together with the frame longitudinal wall 26 on the right side of the vehicle. In addition, a plurality of middle walls 38 are provided inside each of the side frames 36, and the space inside each of the side frames 36 is divided into three in the vehicle width direction by the middle walls 38.

[0041] On the other hand, the tray 18 constituting the housing 14 together with the frame 16 is entirely formed of a metal such as aluminum or an alloy containing aluminum. Figure 2 As shown, the tray 18 is formed in a box shape as a whole and is opened toward the upper side of the vehicle, and a tray flange 40 extends from the upper end of the tray 18 toward the outer side of the tray 18 in a direction perpendicular to the vertical direction of the vehicle. Figure 1 As shown, the tray 18 is arranged inside the frame body 20 of the frame 16. In a state where the tray 18 is arranged inside the frame body 20, the tray bottom 42, which serves as a placement portion of the tray 18 and constitutes a refrigerant flow path, is connected to the frame bottom 22 of the frame body 20, and the tray bottom 42 and the frame bottom 22 are integrally welded at the welding portion 44.

[0042] A plurality of transverse reinforcements 46 are provided as reinforcements on the inner side of the tray 18. The longitudinal direction of these transverse reinforcements 46 is set to the vehicle width direction. The cross-sectional shape of the transverse reinforcements 46 when cut in a direction orthogonal to the longitudinal direction of these transverse reinforcements 46 is set to be a rectangular shape, and is set to be a hollow shape that penetrates in the longitudinal direction. A middle wall 50 is provided on the inner side of the transverse reinforcement 46, and the space inside the transverse reinforcement 46 is divided into two in the vehicle vertical direction by the middle wall 50.

[0043] A transverse flange 48 extends toward the vehicle front side from the vehicle front side end of the vehicle lower side end of the transverse reinforcement 46, and extends toward the vehicle rear side from the vehicle rear side end of the vehicle lower side end of the transverse reinforcement 46. The transverse flange 48 is connected to the tray bottom 42 of the tray 18, and the transverse flange 48 and the tray bottom 42 are integrally welded at a welding portion 52.

[0044] Batteries 56 are placed on the tray bottom 42 on the vehicle front-rear direction side of the transverse reinforcement 46. These batteries 56 are set as secondary batteries such as lithium ion secondary batteries, for example. The battery 56 is electrically connected to the motor via the control device, and the control device supplies power from the battery 56 to the motor to drive the motor. When the driving wheels of the vehicle are rotated by the driving force output from the motor, the vehicle travels.

[0045] On the other hand, a first plate 58 constituting a refrigerant flow path together with the tray bottom 42 is provided on the vehicle lower side of the tray 18. The first plate 58 is formed by press-forming a plate made of a metal such as aluminum or an alloy containing aluminum, for example.

[0046] A plurality of first recesses 60 are formed in the first plate 58. The first recesses 60 are formed in a substantially U-shape opening toward the upper side of the vehicle, and the longitudinal direction of each first recess 60 is the vehicle width direction. The first recesses 60 are formed at predetermined intervals in the vehicle front-rear direction, and a transverse reinforcement 46 is disposed on the tray bottom 42 of the tray 18 on the upper side of each first recess 60.

[0047] Second recesses 62 are formed on the vehicle front side and the vehicle rear side of the first recesses 60. The second recesses 62 are formed in a substantially U-shape opening toward the upper side of the vehicle, and the longitudinal direction of each second recess 62 is the vehicle width direction. The battery 56 is arranged on the tray bottom 42 of the tray 18 on the vehicle upper side of each second recess 62.

[0048] like Figure 1 As shown, in the first plate 58, the vehicle upper side end portion of the second recessed portion 62 on both sides in the vehicle front-rear direction is connected to the tray bottom 42 of the tray 18 from the vehicle lower side, and is integrally welded to the tray bottom 42 at the welding portion 66. Thus, the cross-sectional shape of the second recessed portion 62 and the tray bottom 42 when cut in a direction orthogonal to the vehicle width direction is set to a closed rectangular shape.

[0049] In addition, if Figure 2As shown, third recesses 64 are formed on both sides of each first recess 60 in the vehicle width direction. The third recess 64 is set to be a substantially U-shaped opening toward the upper side of the vehicle, and both ends of each third recess 64 in the vehicle front-rear direction are connected to the second recess 62, and the inner side of the second recess 62 and the inner side of the third recess 64 are connected to each other.

[0050] A pair of extensions 80 extending toward the vehicle front side are formed on the vehicle front side of the second recess 62 closest to the vehicle front side. The extension 80 is box-shaped and opens toward the vehicle upper side, and the vehicle rear side end communicates with the second recess 62 closest to the vehicle front side in the first plate 58.

[0051] These extensions 80 are provided at a predetermined distance from each other in the vehicle width direction. The extension 80 on the right side of the vehicle is formed along the longitudinal wall on the right side of the vehicle of the first plate 58. The longitudinal wall on the left side of the vehicle of the extension 80 on the right side of the vehicle extends toward the front side of the vehicle, whereas the longitudinal wall on the right side of the extension 80 on the right side of the vehicle gradually inclines toward the front side of the vehicle and toward the left side of the vehicle.

[0052] In contrast, the extension portion 80 on the left side of the vehicle extends from a substantially middle portion in the vehicle width direction of the vehicle front end of the first plate 58. The longitudinal wall on the right side of the vehicle of the extension portion 80 on the left side of the vehicle extends toward the vehicle front side, whereas the longitudinal wall on the left side of the vehicle of the extension portion 80 on the left side of the vehicle gradually inclines toward the vehicle front side and toward the vehicle right side.

[0053] A second plate 82 as a plate portion is provided on the vehicle upper side of the two extensions 80 and on the vehicle lower side of the front frame 30 of the frame 16. The end portion of the second plate 82 on the vehicle front side is integrally joined to the first plate 58 by a welded portion 84. In addition, a pair of holes 86 are formed in the second plate 82. One hole 86 corresponds to one extension 80, and the other hole 86 corresponds to the other extension 80.

[0054] In addition, each hole portion 86 is provided with an inlet and outlet portion 88. The outer diameter of the inlet and outlet portion 88 is set to be equal to the inner diameter of the hole portion 86. In addition, the inlet and outlet portion 88 is set to be a tube penetrating in the vertical direction of the vehicle, and the vehicle lower end of the inlet and outlet portion 88 is connected to the inner side of the extension portion 80. In contrast, these inlet and outlet portions 88 are connected to a radiator (heat exchange device) mounted on the vehicle through another pipe, etc., and the coolant 70 (see Figure 1 ) is supplied to the inlet and outlet portion 88 on one side via another pipe, etc.

[0055] The coolant 70 is formed of a liquid such as water or ethylene glycol. After passing through the hole 86 on one side, the coolant 70 passes through the inner side of the second recess 62 and the inner side of the third recess 64. If the coolant 70 flows inside the second recess 62, heat is exchanged between the coolant 70 and the battery 56, the battery 56 is cooled, and the coolant 70 is heated. The coolant 70 heated in this way flows out from the hole 86 on the other side. The coolant 70 that flows out from the hole 86 flows to the radiator via a pipe or the like. In the radiator, for example, when the vehicle is running, the running wind passing through the radiator exchanges heat with the coolant 70 flowing in the radiator, thereby cooling the coolant 70.

[0056] The above structure has a protective member 72 on the lower side of the vehicle. The protective member 72 is formed of a metal such as aluminum, iron, or an alloy containing such a metal, and is supported by being connected to the floor of the vehicle at the outer peripheral portion. The protective member 72 has a flat plate portion 74. The flat plate portion 74 is formed in a substantially rectangular flat plate shape in a plan view, and is arranged on the lower side of the vehicle of the first plate 58. The surface of the flat plate portion 74 on the upper side of the vehicle of the protective member 72 is in contact with the lower side surface of the vehicle at the bottom of the first recess 60 of the first plate 58, and the surface of the flat plate portion 74 on the upper side of the vehicle and the bottom of the first recess 60 of the first plate 58 are integrally connected by bolts 76 as fastening members.

[0057] Here, the first recessed portion 60 is formed deeper than the second recessed portion 62 and the third recessed portion 64, so the bottom of the first recessed portion 60 is arranged on the lower side of the vehicle than the bottom of the second recessed portion 62 and the bottom of the third recessed portion 64. Therefore, the flat plate portion 74 is in contact with the bottom of the first recessed portion 60, and the flat plate portion 74 is separated from the bottom of the second recessed portion 62 and the bottom of the third recessed portion 64 toward the lower side of the vehicle.

[0058] <Functions and Effects of the Present Embodiment>

[0059] In this embodiment, the battery 56 is placed on the tray bottom 42 of the tray 18 of the housing 14. The battery 56 may generate heat due to charging, for example. Here, the coolant 70 flows in the second recess 62 of the first plate 58 on the vehicle lower side of the battery 56. If the temperature of the coolant 70 is lower than the temperature of the battery 56, heat is exchanged between the coolant 70 and the battery 56. As a result, the battery 56 is cooled, and the temperature rise of the battery 56 can be suppressed.

[0060] On the other hand, when the vehicle is running, the lower part of the vehicle may contact the road surface due to unevenness of the road surface, and the lower part of the vehicle may receive a load from the lower side of the vehicle. Here, a protective member 72 is provided on the lower side of the vehicle of the housing 14. Thus, the housing 14 can be prevented from directly contacting the road surface, and the load from the road surface can be prevented from being directly input to the housing 14. In addition, the flat plate portion 74 of the protective member 72 is provided on the lower side of the vehicle of the first plate 58. Thus, the load from the road surface can be prevented from being directly input to the first plate 58, especially the second recessed portion 62 and the third recessed portion 64.

[0061] The second recessed portion 62 and the third recessed portion 64 of the first plate 58 together with the tray bottom 42 of the tray 18 form a flow path for the coolant 70. Therefore, by preventing the load from the road surface from being directly input to the second recessed portion 62 and the third recessed portion 64, it is possible to suppress the second recessed portion 62 or the third recessed portion 64 from being deformed by the load from the road surface. As a result, it is possible to suppress the flow of the coolant 70 from being stagnant or the coolant 70 from leaking to the outside of the second recessed portion 62 or the third recessed portion 64 due to the deformation of the second recessed portion 62 or the third recessed portion 64.

[0062] In addition, the flat plate portion 74 of the protection member 72 is away from the bottom of the second recess 62 and the bottom of the third recess 64 toward the lower side of the vehicle. Therefore, it is possible to suppress the load from the road surface input to the flat plate portion 74 of the protection member 72 from being transmitted from the flat plate portion 74 to the bottom of the second recess 62 or the bottom of the third recess 64. Thus, it is possible to effectively suppress the second recess 62 or the third recess 64 from being deformed by the load from the road surface. Thus, it is possible to effectively suppress the flow of the coolant 70 from being stagnant or the coolant 70 from leaking to the outside of the second recess 62 or the third recess 64 due to the deformation of the second recess 62 or the third recess 64.

[0063] In addition, the flat plate portion 74 of the protection member 72 is connected to the bottom of the first recessed portion 60 of the first plate 58 by bolts 76. Furthermore, the portions on both sides of the vehicle front-rear direction of the end portion of the first recessed portion 60 on the vehicle upper side of the first plate 58 are integrally welded to the tray bottom 42 of the tray 18 at the welding portions 66. Therefore, the load from the road surface input to the flat plate portion 74 of the protection member 72 is transmitted to the bottom of the first recessed portion 60 of the first plate 58, and further transmitted to the tray bottom 42 of the tray 18. Thus, the load from the road surface can be dispersed to the tray 18.

[0064] The tray bottom 42 of the tray 18 is integrally welded to the frame bottom 22 of the frame 16 at the weld 44. Thus, the load from the road surface can be dispersed to the frame 16 having a higher rigidity than the tray 18 and the first plate 58, and the load from the road surface can be supported by the frame 16.

[0065] The tray bottom 42 of the tray 18 is integrally welded to the transverse reinforcement 46 at the welded portion 52. Thus, the load from the road surface can be dispersed to the high-strength transverse reinforcement 46 provided to reinforce the shell 14 and supported by the transverse reinforcement 46.

[0066] Furthermore, the protector 72 is connected to the first plate 58 by bolts 76. Therefore, it is not necessary to form holes for inserting the bolts 76 and the like in the tray 18. Thus, the liquid-tightness of the tray bottom 42 side of the tray 18 can be improved.

[0067] In this embodiment, the second recess 62 and the third recess 64 of the first plate 58 and the tray bottom 42 of the tray 18 form a flow path for the coolant 70. In such a structure, the tray bottom 42 is directly cooled by the coolant 70. Thus, the battery 56 can be cooled efficiently.

[0068] Moreover, in a structure in which a flow path of a tubular coolant 70 is arranged on the lower side of the vehicle at the tray bottom 42 of the tray 18, a heat conduction component is provided between the flow path and the tray bottom 42 to improve the cooling efficiency of the tray bottom 42. However, in the present embodiment, since the coolant 70 directly cools the tray bottom 42, such a heat conduction component is not required, and the number of components can be reduced.

[0069] In addition, the inflow and outflow portion 88 communicates with the flow path of the coolant 70 in the first plate 58 from the upper side of the vehicle, and the coolant 70 flows into the flow path of the coolant 70 in the first plate 58 from the upper side of the vehicle through the inflow and outflow portion 88, or the coolant 70 flows out from the flow path of the coolant 70 to the upper side of the vehicle through the inflow and outflow portion 88. In this way, the inflow and outflow portion 88 communicates with the flow path of the coolant 70 in the first plate 58 from the upper side of the vehicle. Therefore, the ground height from the road surface can be ensured, and the load can be suppressed from being transmitted to the flow path of the coolant 70 in the first plate 58.

[0070] Furthermore, the front frame 30 is provided on the vehicle front side of the tray 18. Thus, the tray 18 is reinforced by the front frame 30. In addition, the inflow and outflow portion 88 is provided on the vehicle front side relative to the front frame 30. Therefore, the ground height of the flow path of the coolant 70 in the first plate 58 from the road surface can be further effectively ensured, and the transmission of the load to the flow path of the coolant 70 in the first plate 58 can be further effectively suppressed.

[0071] In general vehicles, a heat exchanger such as a radiator is provided on the vehicle front side of the front frame 30. Therefore, since the extension portion 80 extends from the first plate 58 toward the vehicle front side, the coolant 70 can be easily communicated with the heat exchanger.

[0072] Furthermore, the flow path of the coolant 70 in the first plate 58 includes the extension portion 80 extending toward the inlet and outlet portion 88. Therefore, the inlet and outlet portion 88 may be opened on the vehicle upper side of the extension portion 80. Therefore, the structure of the inlet and outlet portion 88 can be simplified.

[0073] In addition, the flow path of the coolant 70 in the first plate 58 and the extension 80 are partially open on the upper side of the vehicle. The opening on the upper side of the flow path of the coolant 70 in the first plate 58 is closed by the tray bottom 42 of the tray 18. Therefore, the number of components between the battery 56 and the refrigerant can be reduced, and the cooling efficiency of the battery 56 is improved. On the other hand, the opening on the upper side of the extension 80 is closed by the second plate 82. Here, the portion of the opening on the upper side of the extension 80 on the vehicle that does not overlap with the tray bottom 42 in the vehicle up-down direction can be closed by the second plate 82. Therefore, the extension 80 and the flow path of the coolant 70 in the first plate 58 can be integrated, and the structure of the flow path of the coolant 70 in the first plate 58 and the extension 80 can be simplified.

[0074] It should be noted that in the present embodiment, the tray bottom 42 of the tray 18 and the second recess 62 of the first plate 58 constitute a flow path for the coolant 70. However, a structure may be provided in which the tubular flow path for the coolant 70 is provided independently of the tray 18, and the tray bottom 42 is cooled indirectly by the coolant 70 via the tubular flow path.

[0075] In this embodiment, the first plate 58 is integrally connected to the frame bottom 22 of the frame 16 and the transverse reinforcement 46 via the tray bottom 42 of the tray 18. However, the first plate 58 may not be connected to the frame bottom 22 or the transverse reinforcement 46.

[0076] Furthermore, in the present embodiment, the refrigerant is the liquid cooling liquid 70. However, the refrigerant may be a gas, and the refrigerant is not limited to a specific form.

[0077] In the present embodiment, the housing 14 is a box-shaped housing opened toward the upper side of the vehicle. However, the housing 14 in the present embodiment may be a lower housing, and an upper housing may be provided to cover and seal the lower housing from the upper side of the vehicle.

[0078] Moreover, in the present embodiment, the front frame 30, the rear frame 32, the side frame 36 on the left side of the vehicle, and the side frame 36 on the right side of the vehicle are provided. However, at least one of the front frame 30, the rear frame 32, the side frame 36 on the left side of the vehicle, and the side frame 36 on the right side of the vehicle may be provided.

[0079] The inflow and outflow portion 88 is provided on the vehicle front side of the first plate 58. However, the inflow and outflow portion 88 may be provided on the vehicle rear side of the first plate 58, on the vehicle left side of the first plate 58, or on the vehicle right side of the first plate 58.

Claims

1. A vehicle lower structure, comprising: The housing has a mounting portion on which the battery is mounted on an upper surface in a vertical direction of the vehicle, and is disposed on a lower side of the vehicle; A frame is provided on at least one of the outer side of the housing in the vehicle front-rear direction and the outer side in the vehicle left-right direction to strengthen the housing; A first plate, disposed on the vehicle lower side of the housing, having a plurality of recessed portions on an upper surface in the vehicle upper and lower directions; An extension portion extending from an end of the first plate and having an opening on an upper side of the vehicle; a second plate, disposed between the housing and the first plate, closing the opening of the extension portion; a refrigerant flow path formed by the plurality of recesses being closed by the lower surface of the mounting portion and the opening of the extension portion being closed by the second plate, and capable of heat exchange between the battery on the mounting portion and the refrigerant; and The inflow and outflow portion is provided on the upper side of the extension portion of the vehicle, is communicated with the refrigerant flow path from the upper side of the vehicle, and can allow the refrigerant to flow in or out. The frame includes a frame flange extending outward from an end portion on an upper side of the vehicle, and the frame flange is directly or indirectly connected to a floor constituting a vehicle body of the vehicle from a lower side of the vehicle.

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