Vehicle battery pack

Abstract

To provide an on-vehicle battery pack which is capable of protecting a battery and a cooling path, and which also allows a reduction in weight.SOLUTION: An on-vehicle battery pack 20 comprises a battery tray 71 made up of a floor part 76, a right frame 96, and a left frame 97. The battery tray has: a battery placement region 115; and a shock absorption region 116 on the right side and a shock absorption region 116 on the left side. The battery placement region is provided at the center in the vehicle width direction, and a battery module 62 is mounted thereon. The shock absorption regions on the right and left sides are provided on the outside of the battery placement region in the vehicle width direction. In the battery placement region, a cooling path 85 for cooling the battery module extends in the vehicle longitudinal direction.SELECTED DRAWING: Figure 5

Description

[Technical field]

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

[0002] A known vehicle-mounted battery pack has, for example, a battery module mounted on a tray bottom plate (hereinafter referred to as a floor), a mounting beam (hereinafter referred to as a frame body) provided around the periphery of the floor, and the frame body attached to the bottom of the vehicle. The floor includes an upper plate portion, a middle plate portion, and a lower plate portion, and a cooling cavity is formed between the upper plate portion and the middle plate portion. In addition, a buffer cavity is formed between the middle plate portion and the lower plate portion (i.e., below the cooling cavity). In the cooling cavity, for example, cooling piping for cooling the battery module is disposed, and in the buffer cavity, for example, the battery module and the cooling piping are protected from impacts from below (for example, see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2019-531955 Summary of the Invention [Problem to be solved by the invention]

[0004] Here, the conventional buffer cavity can protect the battery module and the cooling pipes from impacts from below. However, when a load is input from the side of the vehicle body due to a side collision, it is difficult for the conventional buffer cavity to absorb the input load and protect the battery module and the cooling pipes. Therefore, the load input from the side of the vehicle body due to a side collision may cause the frame body to deform inward in the vehicle width direction, which may damage the battery module (i.e., the battery) and the cooling pipes (i.e., the cooling passage). One possible solution to this problem is to reinforce the floor, for example. However, if the floor is reinforced, it becomes difficult to reduce the weight of the vehicle, and from this perspective, there is still room for improvement.

[0005] An object of the present invention is to provide a battery pack for mounting on a vehicle that can protect a battery and a cooling passage and can also be made lighter in weight. [Means for solving the problem]

[0006] In order to solve the above problems, the present invention proposes the following means. (1) A vehicle-mounted battery pack according to the present invention includes a battery tray (e.g., battery tray 71 in the embodiments) that includes a floor section (e.g., floor section 76 in the embodiments) that is arranged under a floor of a vehicle (e.g., vehicle Ve in the embodiments), and a frame body (e.g., frame body 77 in the embodiments) that has side frames (e.g., right side frame 96 and left side frame 97 in the embodiments) that are arranged at least on the left and right sides of the floor section in the vehicle width direction and are attached to the vehicle. The battery tray includes a battery arrangement area (e.g., battery arrangement area 115 in the embodiments) that is arranged in the center in the vehicle width direction and on which a battery module (e.g., battery module 62 in the embodiments) composed of a plurality of batteries (e.g., battery 123 in the embodiments) is placed, and an impact absorbing area (e.g., impact absorbing area 116 on the left and right sides in the embodiments) that is arranged outside the battery arrangement area in the vehicle width direction. Inside the battery arrangement area, a cooling passage (e.g., cooling passage 85 in the embodiments) that cools the battery module is arranged to extend in the front-rear direction of the vehicle body.

[0007] According to this configuration, the battery module is placed in the battery arrangement area of ​​the battery tray, and the cooling passage is extended in the front-rear direction of the vehicle body inside the battery arrangement area. In other words, the battery arrangement area also serves as a water jacket for the battery pack. Therefore, for example, a cooling water connector that connects the cooling passage to a cooling radiator can be disposed in front of the battery module. This makes it possible to prevent the cooling water connector and the cooling passage (e.g., cooling pipes) from protruding outward in the vehicle width direction of the battery module. Therefore, for example, the coolant connector and the cooling passage can be protected against a load input from the side of the vehicle body due to a side collision (hereinafter also referred to as a side impact load), and the coolant can be prevented from entering the battery module side.

[0008] In addition, an impact absorbing area is provided on the outer side of the battery arrangement area in the vehicle width direction of the battery tray. Therefore, for example, when a side impact load is input from the side of the vehicle body, the impact absorbing area can absorb the side impact load and protect the battery module. This eliminates the need to reinforce the outer part of the vehicle more than necessary, and can reduce the weight of the vehicle. Furthermore, since the battery arrangement area also serves as a water jacket, the floor and the cooling passages can be molded (formed) as a single unit, which contributes to reducing the weight and cost of the battery pack.

[0009] (2) The frame body has, in addition to the side frames, a front frame (e.g., front frame 94 in the embodiments) that is provided on the front side of the floor portion and attached to the vehicle, and a rear frame (e.g., rear frame 95 in the embodiments) that is provided on the rear side of the floor portion and attached to the vehicle, and the side frames, the front frame, and the rear frame form a rectangular frame shape, and the frame body is provided with a lid portion (e.g., case cover 66 in the embodiments) that forms an enclosed space for storing the battery module together with the battery tray, and the cooling passage may be formed by a hollow chamber (e.g., first hollow chamber 81 in the embodiments) that extends in the fore-and-aft direction of the vehicle inside the floor portion.

[0010] According to this configuration, a hollow chamber is provided inside the floor portion, and the cooling passage is formed in the hollow chamber. Therefore, the cooling passage is formed outside the sealed space that houses the battery module, and the cooling passage can be separated from the battery module. This makes it unnecessary to take into consideration (measures) the reliability of manufacturing quality and strength due to water leakage from the cooling passage, for example, and reduces costs and weight.

[0011] (3) At least a pair of hollow chambers may be provided inside the floor portion, and the cooling passage may be formed in a U-shape by the pair of hollow chambers, with one hollow chamber communicating with the other hollow chamber.

[0012] According to this configuration, the cooling passage is formed in a U-shape by a pair of hollow chambers by communicating one hollow chamber with the other hollow chamber. Therefore, the supply port and the discharge port of the cooling passage can be arranged on one of the vehicle body front side and the vehicle body rear side of the floor part (specifically, the battery arrangement area part). This allows, for example, the cooling water connectors that connect the supply port and the discharge port to the radiator to be arranged together on one of the vehicle body front side and the vehicle body rear side of the battery arrangement area part. Therefore, for example, in the engine room of the vehicle, the cooling water connector that connects the cooling passage to the cooling radiator can be arranged at the shortest distance from the cooling radiator.

[0013] In addition, by arranging the cooling water connectors together on either the front side or the rear side of the battery arrangement area, the cooling water connectors can be concentrated in one place, which, for example, simplifies the support part for the cooling water connectors and reduces the weight and cost of the battery pack.

[0014] (4) The floor portion and the side frames may be integrally formed with a plurality of hollow chambers extending in the fore-and-aft direction of the vehicle body.

[0015] According to this configuration, the floor portion and the side frame are each integrally formed with a plurality of hollow chambers, so that the floor portion and the side frame can be formed by extrusion molding, for example. Here, for example, it is conceivable to form the floor and side frames by press molding. However, in this case, when changing, for example, the battery arrangement area and the shock absorbing area in accordance with the size and shape (i.e., size) of the battery module, it is necessary to change (modify) the entire mold for press molding, which is an obstacle to reducing costs. Therefore, the floor and side frames are formed by extrusion molding. This makes it possible to change the floor and side frames at low cost to match the size and shape of the battery module by changing (modifying) the extrusion nozzle of the extrusion molding device.

[0016] Furthermore, by forming the floor and side frames by extrusion molding in the longitudinal direction of the vehicle body, the floor and side frames can be extended in the longitudinal direction of the vehicle body with a hollow cross-section of a uniform thickness, which makes it possible to uniformly absorb the impact energy of, for example, the side frames and impact absorbing regions in response to a side impact load input due to a side collision. Furthermore, by forming the floor and side frames by extrusion molding in the longitudinal direction of the vehicle body, it is possible to change the thickness of the side frames, impact absorbing regions, etc. This makes it possible to adjust the deformation mode of the side frames, impact absorbing regions, etc. in response to a side impact load input due to a side collision, thereby adjusting the impact energy absorption effect.

[0017] (5) The side frame is formed thinner than the impact absorbing area, and the impact absorbing area may have at least one of a sloping portion (e.g., the easily deformable portion 118 in the embodiment) and a thin portion (e.g., the easily deformable portion 118 in the embodiment) in a lower portion (e.g., the lower portion 116a in the embodiment).

[0018] (Effect 5) According to this configuration, the side frame is formed thinner than the impact absorbing region, and furthermore, at least one of an inclined portion and a thin portion is formed on the lower portion (lower surface) of the impact absorbing region. Therefore, when a side impact load is input due to a side collision, the impact absorbing region is deformed downward and the side frame is crushed (compressed), so that the impact energy can be absorbed well. This allows the side frames and the impact absorbing region (ie, the battery pack) to be lighter in weight, and further allows the impact energy absorption effect to be improved.

[0019] In addition, for example, by ensuring the thickness of the impact absorbing region, it is possible to suitably suppress deformation of the impact absorbing region, thereby ensuring good protection of the battery module against a side impact load input due to a side collision.

[0020] (6) The side frame may have a thin portion (for example, thin portion 113a in the embodiment) at the center of the cross section.

[0021] According to this configuration, a thin wall portion is formed at the center of the cross section of the side frame, so that the side frame can be crushed from the center of the cross section by the side impact load input during a side collision, which allows the side frame to be crushed entirely by the side impact load, thereby improving the impact energy absorption effect.

[0022] (7) The side frame may have a lower portion (for example, the lower portion 108c of the protruding portion in the embodiment) disposed at a position lower in the up-down direction than a lower portion of the battery arrangement area (for example, the lower portion 115a in the embodiment).

[0023] According to this configuration, the lower part of the side frame is disposed at a position lower in the up-down direction than the lower part of the battery arrangement area. Therefore, the side frame can be used as a first ground contact point with, for example, a slope of the road surface or a protrusion on the road surface. This allows the side frame to prevent damage to or contact with the battery arrangement area caused by the slope or protrusion. Furthermore, by having the side frame come into contact with the slope of the road surface or a protrusion on the road surface earlier than other parts such as the battery arrangement area, the driver can intuitively be informed of the contact with the slope or protrusion.

[0024] (8) The battery arrangement area may include a plurality of vertically elongated batteries (e.g., battery 123 in the embodiment) constituting the battery module arranged with their longitudinal direction facing the fore-and-aft direction of the vehicle, and may be provided with an upper cross member (e.g., upper cross member 73 in the embodiment) that fixes the plurality of batteries placed in the battery arrangement area from above.

[0025] According to this configuration, the battery module is made up of multiple vertically long batteries arranged in the vehicle front-rear direction. The multiple batteries are fixed from above by the upper cross member. This allows the multiple batteries (i.e., the battery module) to be stably fixed in the battery arrangement area. Furthermore, by arranging the vertically long batteries in the front-rear direction of the vehicle, the width of the battery module (i.e., the battery arrangement area) in the vehicle width direction can be kept narrow. This makes it possible to secure a space for forming an impact absorbing area between the battery arrangement area and the side frame. As a result, the impact absorbing area can protect the battery module from a side impact load.

[0026] (9) The side frame has the cover fixed to an upper portion on the side of the battery module (e.g., cover mounting portion 108a in the embodiment), and has a protrusion (e.g., protrusion 108 in the embodiment) that protrudes outward in the vehicle width direction from the cover, and the outer portion of the protrusion (e.g., side sill mounting portion 108b in the embodiment) may be fixed to the outside in the vehicle width direction on the vehicle.

[0027] According to this configuration, the side frame is formed with a protruding portion that protrudes outward in the vehicle width direction from the lid portion. The lid portion is fixed to the upper portion of this protruding portion on the side of the battery module. Furthermore, the outer portion of the protruding portion is fixed to the outer side in the vehicle width direction (e.g., the side sill inner) at the bottom of the vehicle. Therefore, a deformation allowable space that allows the side frame (specifically, the protruding portion) to be crushed can be secured between the upper portion and the outer portion above the side frame. This allows the side frame (protruding portion) to be crushed well by the side impact load input due to a side collision, and the impact energy absorption effect can be improved. In addition, the cooling passages and the cooling water connectors can be removed from the deformation allowance space between the upper part and the outer part above the overhanging part. This makes it possible to suppress damage to the cooling passages and the cooling water connectors and to suppress water leakage from the cooling passages and the cooling water connectors when the side frame (particularly the overhanging part) is crushed by a side impact load.

[0028] (10) In the battery arrangement area, a plurality of elongated batteries (e.g., battery 123 in the embodiment) constituting the battery module are arranged with their longitudinal direction in the fore-and-aft direction of the vehicle, and inside the floor portion, there is a hollow portion (e.g., cavity 88 in the embodiment) that is isolated from the hollow chamber (e.g., first hollow chamber 81 in the embodiment) that forms the cooling passage and is formed by another hollow chamber (e.g., second hollow chamber 82 in the embodiment) extending in the fore-and-aft direction of the vehicle, and the battery may be fastened in the hollow portion with a fastening member (e.g., fastening bolt 127 in the embodiment).

[0029] According to this configuration, another hollow chamber is provided inside the floor portion, and the cavity is formed by isolating the cavity from the cooling passage. Furthermore, the multiple batteries are fastened in the cavity with fastening members. Therefore, the multiple batteries can be fixed in the battery arrangement area with fastening members that avoid the cooling passage, and damage to the cooling passage can be suppressed. Furthermore, by fixing multiple batteries to the battery arrangement area, the multiple batteries (i.e., battery modules) can be directly in contact with the battery arrangement area, which can eliminate the need for a pressing member that presses the battery modules into contact with the cooling passages, thereby reducing costs and weight.

[0030] (11) The battery arrangement area has a cooling area (e.g., cooling area 91 in the embodiment) formed by the cooling passage and a hollow area (e.g., hollow area 92 in the embodiment) formed by the hollow portion, and the cooling area and the hollow area may be arranged alternately in the vehicle width direction.

[0031] According to this configuration, the cooling regions and the cavity regions are arranged alternately in the vehicle width direction, so that the battery arrangement region can be efficiently cooled by the cooling regions, thereby improving the cooling performance of the battery arrangement region by the cooling regions. Furthermore, by arranging the cooling regions and the hollow regions alternately in the vehicle width direction, the cooling regions can be arranged at intervals in the vehicle width direction. Therefore, by arranging the battery in the fore-aft direction of the vehicle body avoiding the hollow regions, the battery can be arranged along the cooling regions. This allows the battery to be fixed to the battery arrangement region using the hollow regions. In addition, the battery can be efficiently cooled in the cooling regions, and the cooling performance of the battery can be improved.

[0032] (12) The battery tray may be provided with a lower cross member (e.g., lower cross member 72 in the embodiment) extending in the vehicle width direction at the center of the fore-and-aft direction of the vehicle body and attached to the battery tray, and the lower cross member may be fastened to the battery module in the hollow portion with the fastening member.

[0033] According to this configuration, the lower cross member is provided at the center of the battery tray in the front-rear direction of the vehicle body and extends in the vehicle width direction, so that the side impact load input in the event of a side impact can be supported by the lower cross member, thereby protecting the battery module. Furthermore, the lower cross member is fastened to the battery module in the cavity with a fastening member, so that, for example, twisting of the battery tray can be suppressed by the lower cross member, thereby suppressing unevenness of the multiple batteries caused by twisting of the battery tray. Effect of the Invention

[0034] According to the present invention, the cooling passage extends in the front-rear direction of the vehicle body in the battery arrangement area of ​​the battery tray, and the shock absorbing area is provided on the outer side of the battery arrangement area in the vehicle width direction, thereby protecting the battery and the cooling passage and further reducing the weight. [Brief description of the drawings]

[0035] [Figure 1] 1 is a perspective view of a vehicle equipped with an on-board battery pack according to an embodiment of the present invention; [Diagram 2] 1 is a bottom view of a vehicle equipped with an on-board battery pack according to an embodiment. [Diagram 3] 1 is a perspective view of a vehicle equipped with a battery pack for mounting on a vehicle according to an embodiment, the perspective view being cut away at an upper cross member and a lower cross member. [Figure 4] 1 is an exploded perspective view of a battery case according to an embodiment with a case cover removed from a case body. FIG. [Diagram 5] 1 is a cross-sectional view of a vehicle-mounted battery pack according to an embodiment. [Figure 6] FIG. 2 is a perspective view showing a case main body according to one embodiment. [Figure 7] 1 is a cross-sectional view showing a cooling passage of a battery pack to be mounted on a vehicle according to an embodiment of the present invention; [Figure 8] FIG. 6 is an enlarged cross-sectional view of a portion VIII in FIG. 5. [Figure 9] FIG. 2 is a cross-sectional view taken along line IX-IX in FIG. [Figure 10] FIG. 2 is an exploded perspective view of the battery auxiliary device disassembled from the case body of the embodiment. [Figure 11] 2 is a cross-sectional view of the vehicle shown in FIG. 1 taken along line X1-X1. [Figure 12] 11 is a cross-sectional view illustrating an example in which impact energy is absorbed by a right frame in a case body according to an embodiment. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0036] Hereinafter, a vehicle-mounted battery pack according to one embodiment of the present invention will be described with reference to the drawings. In the drawings, an arrow FR indicates the front of the vehicle, an arrow UP indicates the upper side of the vehicle, and an arrow LH indicates the left side of the vehicle. Although the vehicle is not particularly limited in terms of use or type, an automobile will be described as an example of one embodiment. In addition, the vehicle has a generally symmetrical configuration. Therefore, the following description will be given with the same reference numerals assigned to the left and right components.

[0037] <Vehicle> 1 and 2, a vehicle Ve includes a vehicle body (hereinafter sometimes referred to as a vehicle body 10) 10 and a vehicle-mounted battery pack 20. Hereinafter, the vehicle-mounted battery pack 20 may also be simply referred to as the "battery pack 20."

[0038] <Vehicle body> The vehicle body 10 includes a side sill unit 22, a floor panel 23, a floor tunnel 24, a front side frame unit 25, a rear frame unit 26, a floor cross member unit 27, and a floor vertical frame unit 28.

[0039] The side sill unit 22 includes a right side sill 31 and a left side sill 31. The right side sill 31 is formed with a closed cross section and is a highly rigid member that constitutes part of the framework of the vehicle body 10. The right side sill 31 is provided on the right outer side in the vehicle width direction and extends in the front-rear direction of the vehicle body along the right outer portion of the floor panel 23 in the vehicle width direction. The left side sill 31 is formed with a closed cross section and is a highly rigid member that constitutes part of the framework of the vehicle body 10. The left side sill 31 is provided on the left outer side in the vehicle width direction and extends in the front-rear direction of the vehicle body along the left outer portion of the floor panel 23 in the vehicle width direction.

[0040] A floor panel 23 is provided between the left side sill 31 and the right side sill 31. The floor panel 23 is a plate-like member having a generally rectangular shape in a plan view, and forms the floor of the vehicle Ve. A floor tunnel 24 extends in the front-rear direction of the vehicle body at the center of the floor panel 23 in the vehicle width direction. The floor tunnel 24 is raised upward from the floor panel 23.

[0041] The front side frame unit 25 includes a right front side frame 36 and a left front side frame 36. The right front side frame 36 and the left front side frame 36 are provided forward of the battery pack 20 on the vehicle body. The rear frame unit 26 includes a right rear frame 41 and a left rear frame 41. The right rear frame 41 and the left rear frame 41 are provided rearward of the battery pack 20 on the vehicle body.

[0042] The floor cross member unit 27 is disposed between the right side sill 31 and the left side sill 31 and is joined along the upper surface of the floor panel 23. The floor cross member unit 27 comprises a first floor cross member 44 on the right side, a first floor cross member 44 on the left side, a second floor cross member 45 on the right side, a second floor cross member 45 on the left side, a third floor cross member 46 on the right side, a third floor cross member 46 on the left side, and a fourth floor cross member 47. The floor tunnel 24 extends in the fore-and-aft direction of the vehicle body, intersecting (in this embodiment, perpendicular to) the first floor cross members 44 on the left and right sides, the second floor cross members 45 on the left and right sides, and the third floor cross members 46 on the left and right sides.

[0043] 1 and 3, the floor vertical frame unit 28 includes a plurality of first to fourth floor vertical frames 55-58 provided on the floor panel 23 at intervals in the vehicle width direction. Specifically, the first floor vertical frame 55 and the second floor vertical frame 56 are provided on the floor panel 23 to the right of the floor tunnel 24 at intervals in the vehicle width direction. The third floor vertical frame 57 and the fourth floor vertical frame 58 are provided on the floor panel 23 to the left of the floor tunnel 24 at intervals in the vehicle width direction. The battery pack 20 is provided below the floor panel 23.

[0044] <Battery pack> The battery pack 20 is provided below the floor panel 23 (i.e., under the floor of the vehicle Ve). Furthermore, the battery pack 20 is disposed below the left and right second floor cross members 45, the left and right third floor cross members 46, and the first to fourth floor vertical frames 55 to 58. As shown in FIG. 4, the battery pack 20 includes a battery case 61, a battery module 62, and a battery accessory 63.

[0045] (Battery case) 4 to 6, the battery case 61 includes a case body 65 and a case cover (lid portion) 66. The case body 65 includes a battery tray 71, a lower cross member 72, an upper cross member 73, and an upper deck 74. The battery tray 71 includes a floor portion 76 and a frame body 77.

[0046] The floor section 76 is formed, for example, in a rectangular shape in a plan view, and is provided under the floor of the vehicle Ve (see FIG. 1) and below the battery module 62 so that the battery module 62 can be placed thereon. The floor section 76 has, for example, a flat front surface 76a on which the battery module 62 is placed, and a flat back surface 76b opposite the front surface 76a.

[0047] As shown in Figures 5, 7, and 8, in the floor portion 76, between the front surface 76a and the back surface 76b, there are a plurality (eight in this embodiment) of first hollow chambers (hollow chambers) 81 and a plurality (three in this embodiment) of second hollow chambers (other hollow chambers) 82 integrally formed in the floor portion 76. The multiple first hollow chambers 81 extend in the front-rear direction of the vehicle body inside the floor portion 76. The multiple first hollow chambers 81 are arranged in a pair of first hollow chambers 81 adjacent to each other in the vehicle width direction, and are provided at multiple locations inside the floor portion 76. Each pair of the arranged first hollow chambers 81 is provided at two locations near the center of the floor portion 76 in the vehicle width direction and two locations on the left and right sides in the vehicle width direction, spaced apart in the vehicle width direction. In addition, the first hollow chamber 81 has a partition wall 83 formed in the center in the vehicle width direction in order to ensure the strength and rigidity of the floor portion 76, for example.

[0048] 5 and 6, the pair of first hollow chambers 81 are connected, for example, at the rear end 76c of the floor portion 76, with the rear end 81a of one first hollow chamber 81 communicating with the rear end 81a of the other first hollow chamber 81. Also, the pair of first hollow chambers 81 are opened, for example, at the front end 76d of the floor portion 76, with an opening at the front end 81b of one first hollow chamber 81 and an opening at the front end 81b of the other first hollow chamber 81 (see also FIG. 7). That is, the pair of first hollow chambers 81 are formed in a U-shape in a plan view.

[0049] The pair of first hollow chambers 81 form a cooling passage (cooling water passage) 85 in a U-shape (including an approximately U-shape) in plan view. That is, a plurality of cooling passages (four in this embodiment) are formed by a plurality of first hollow chambers 81 (eight in this embodiment). In this manner, the cooling passage 85 is integrally provided extending in the front-rear direction of the vehicle body inside the floor portion 76. Note that it is sufficient to provide at least one cooling passage 85, and the number of cooling passages 85 can be selected arbitrarily.

[0050] The cooling passage 85 has a water supply connector (cooling water connector) 86 (see also FIG. 7) for supplying water connected to an opening (water supply port) of one of the first hollow chambers 81 at the front end portion 76d of the floor portion 76. Also, a drainage connector (cooling water connector) 87 (see also FIG. 7) for draining water connected to an opening (drain port) of the other first hollow chamber 81 at the front end portion 76d of the floor portion 76. Therefore, for example, the cooling water cooled by a radiator (not shown) of the vehicle Ve (see FIG. 1) can be guided from the water supply connector 86 to one cooling passage 85 as shown by the arrow, and then from the rear end 85a of one cooling passage 85 to the rear end 85a of the other cooling passage 85 as shown by the arrow. Also, the cooling water guided to the rear end 85a of the other cooling passage 85 can be guided to the drain connector 87 via the other cooling passage 85 as shown by the arrow. Furthermore, the cooling water guided to the drain connector 87 can be returned from the drain connector 87 to the radiator. This allows the battery module 62 to be cooled by the cooling water guided to the cooling passage 85. That is, the floor portion 76 also serves as a water jacket for the battery pack 20.

[0051] As shown in FIG. 5 and FIG. 8, a second hollow chamber 82 is integrally formed inside the floor portion 76. The second hollow chamber 82 is formed in a state of being isolated (partitioned) in the vehicle width direction from the first hollow chamber 81 forming the cooling passage 85. The second hollow chamber 82 is provided in the center of the floor portion 76 in the vehicle width direction and extends in the vehicle front-rear direction between the pair of cooling passages 85. The second hollow chamber 82 is provided on the left side of the floor portion 76 in the vehicle width direction and extends in the vehicle front-rear direction between the pair of cooling passages 85. The second hollow chamber 82 is provided on the right side of the floor portion 76 in the vehicle width direction and extends in the vehicle front-rear direction between the pair of cooling passages 85. The second hollow chamber 82 has a partition wall 84 formed in the center of the vehicle width direction in order to ensure the strength and rigidity of the floor portion 76, for example.

[0052] A plurality of cavities 88 (three in this embodiment) are formed by the plurality of second hollow chambers 82. The number of cavities 88 can be selected as desired. By forming a plurality of cavities 88 in the floor portion 76, the floor portion 76 is provided with a cooling region 91 formed by the cooling passage 85 and a cavity region 92 formed by the cavity portions 88. The cooling regions 91 and the cavity regions 92 are arranged alternately in the vehicle width direction. A frame body 77 is provided around the floor portion 76.

[0053] As shown in FIG. 6, the frame body 77 includes a front frame (front frame) 94, a rear frame (rear frame) 95, a right frame (side frame) 96, a left frame (side frame) 97, a right inclined frame 98, and a left inclined frame 99.

[0054] As shown in Figs. 2 and 6, the front frame 94 is provided at the front end (vehicle body front side) 76d of the floor portion 76 in the vehicle body front-rear direction. A right front support bracket 102 and a left front support bracket 102 protrude toward the front of the vehicle body from the front frame 94. The right front support bracket 102 is attached to the right branch portion (vehicle bottom) 38 extending from the rear portion 36a of the right front side frame 36. The left front support bracket 102 is attached to the left branch portion (vehicle bottom) 38 extending from the rear portion 36a of the left front side frame 36. In other words, the front frame 94 is attached to the right branch portion 38 and the left branch portion 38.

[0055] The rear frame 95 is provided at the rear end (rear side of the vehicle body) 76c of the floor portion 76 in the front-rear direction of the vehicle body. A right rear support bracket 104 and a left rear support bracket 104 protrude toward the rear of the vehicle body from the rear frame 95. The right rear support bracket 104 is attached to the fourth floor cross member (bottom of the vehicle) 47 via a right connecting bracket 105 (see also FIG. 5). The left rear support bracket 104 is attached to the fourth floor cross member 47 via the left connecting bracket 105. In other words, the front frame 94 is attached to the fourth floor cross member 47.

[0056] 6, 8 and 9, the right frame 96 is provided along the right side (right side) 76e of the floor 76 in the vehicle width direction. The right frame 96 is attached, for example, to the bottom (bottom of the vehicle) 32a of the inner panel 32 of the right side sill 31 from below with fastening bolts 33. The right frame 96 will be described in detail later.

[0057] 2, 5 and 6, the left side frame 97 is provided in the vehicle width direction along the left side portion (left side) 76f of the floor portion 76. The left side frame 97 is attached to the bottom portion 32a (bottom portion of the vehicle) of the inner panel 32 of the left side sill 31 from below. The right oblique frame 98 is connected at an oblique angle to the rear end of the right frame 96 and the right end of the rear frame 95. The left oblique frame 99 is connected at an oblique angle to the rear end of the left frame 97 and the left end of the rear frame 95. The frame body 77 is formed into a rectangular frame shape (including a substantially rectangular frame shape) in a plan view by a front frame 94, a rear frame 95, a left frame 97, a right frame 96, a right inclined frame 98, and a left inclined frame 99. A case cover 66 (see also FIG. 4) is attached to the frame body 77.

[0058] 8 and 9, the right frame 96 has a frame floor portion 107 and a protruding portion (extension portion) 108. The frame floor portion 107 is provided along the right side portion 76e of the floor portion 76, and is provided between the right side portion 76e of the floor portion 76 and the right wall 66a of the case cover 66. The frame floor portion 107 has a surface 107a formed flush with the surface 76a of the floor portion 76.

[0059] The protruding portion 108 protrudes outward in the vehicle width direction (i.e., toward the right side sill 31 side) from the right side wall 66a of the case cover 66. The protruding portion 108 has a cover mounting portion (upper portion) 108a and a side sill mounting portion (outer portion) 108b. The cover mounting portion 108a is formed on the upper side of the protruding portion 108 on the battery module side. The mounting portion 67 (see also FIG. 7) of the case cover 66 is fixed to the cover mounting portion 108a from above with a fastening bolt 111. The side sill mounting portion 108b is formed on the outer side of the protruding portion 108 on the side sill 31 side. The side sill mounting portion 108b is fixed from below by a fastening bolt 33 to a bottom portion 32a of a side sill inner (the outer side in the vehicle width direction at the bottom of the vehicle) 32 of the right side sill 31.

[0060] Inside the right frame 96, a plurality (a large number) of frame hollow chambers (hollow chambers) 112 are formed integrally with a partition wall 113. The plurality of frame hollow chambers 112 are provided inside the right frame 96 and extend in the front-rear direction of the vehicle body. The right frame 96 has, for example, a thin portion 113a at the cross-sectional center of the overhanging portion 108. The thin portion 113a is located at the cross-sectional center of the overhanging portion 108 of the partition wall 113 and is formed horizontally facing in the vehicle width direction. Further, the right frame 96 is arranged such that the lower part (bottom surface) 108c of the protruding part 108 is located lower in the up-down direction than the lower part (bottom surface, lower part of the side frame) 115a of the battery arrangement region 115.

[0061] 5 and 6, the left frame 97 is formed generally symmetrically to the right frame 96. Therefore, hereinafter, the same reference numerals as those in the right frame 96 are used to designate the respective parts forming the left frame 97, and detailed description thereof will be omitted.

[0062] Here, the battery tray 71 has a tray floor 75 formed by floor 76, frame floor 107 of the right frame 96, and frame floor 107 of the left frame 97. The tray floor 75 has a battery arrangement area 115, a right impact absorbing area (impact absorbing area) 116, and a left impact absorbing area (impact absorbing area) 116. The battery arrangement area 115 is located at the center in the vehicle width direction, and the entire battery module 62 is placed therein. Inside the battery arrangement area 115, a plurality (a large number) of first hollow chambers 81 (i.e., cooling passages 85) and a plurality (a large number) of second hollow chambers 82 (i.e., hollow portions 88) are integrally formed.

[0063] 8, the right impact absorbing region 116 is located between the battery arrangement region 115 and the right side wall 66a (i.e., the protruding portion 108) of the case cover 66, on the outer side in the vehicle width direction of the battery arrangement region 115. Inside the right impact absorbing region 116, a plurality of frame cavities 112 (i.e., hollow portions) are integrally formed.

[0064] In addition, the thickness of the partition wall 113 forming the frame hollow chamber 112 of the protruding portion 108 is formed to be thinner than the impact absorbing region 116 on the right side. Furthermore, the impact absorbing region 116 has an easily deformed portion 118, for example, in the lower portion 116a. The easily deformed portion 118 is formed, for example, as an inclined portion inclined upward from the lower portion 108c side of the protruding portion 108 toward the inside in the vehicle width direction. Note that, in the embodiment, an example in which the easily deformed portion 118 is formed as an inclined portion will be described, but this is not limited thereto. As another example, for example, the easily deformed portion 118 may be formed as a thin portion that makes the partition wall 113 corresponding to the easily deformed portion 118 thinner than the thickness of the other partition walls 113. Alternatively, the inclined portion of the embodiment in which the easily deformed portion 118 is formed may be thinner than the thickness of the other partition walls 113.

[0065] 5 and 6, the left shock absorbing region 116 is formed generally symmetrically with the right shock absorbing region 116. Therefore, a detailed description of the left shock absorbing region 116 will be omitted. Note that hereinafter, the right shock absorbing region 116 may be abbreviated to "shock absorbing region 116."

[0066] As shown in Figures 5 and 6, a lower cross member 72 is provided on the tray floor 75. The lower cross member 72 extends in the vehicle width direction at the center (middle) of the tray floor 75 in the fore-and-aft direction of the vehicle body. The lower cross member 72 is attached to the tray floor 75 from above by a fastening bolt 127 (described later in Figure 11). In this state, the lower cross member 72 is connected to the right frame 96 and the left frame 97. The lower cross member 72 will be described in detail later. In battery arrangement area 115 of tray floor 75, driving battery modules 62 (see FIG. 4) are placed in a front area on the vehicle body front side of lower cross member 72 and a rear area on the vehicle body rear side of lower cross member 72.

[0067] (Battery module) As shown in Figures 4 to 6, the battery module 62 is composed of, for example, a first module 121 placed in the front area of ​​the battery arrangement area 115 and a second module 122 placed in the rear area of ​​the battery arrangement area 115. In the first module 121, a plurality of batteries 123 are arranged in the vehicle width direction in the front area. For example, the battery 123 is formed into a vertically long rectangular body by stacking a plurality of battery cells (not shown) in the longitudinal direction. Hereinafter, the vertically long battery 123 may be referred to as a "vertically long battery 123." Furthermore, arranging the vertically long battery 123 vertically means arranging the battery 123 so that its longitudinal direction faces the front-rear direction of the vehicle body.

[0068] That is, the first modules 121 are arranged in the vehicle width direction in a state where multiple vertically long batteries 123 are arranged vertically in the front area of ​​the battery arrangement area 115. The second modules 122 are arranged in the vehicle width direction in a state where multiple vertically long batteries 123 are arranged vertically in the rear area of ​​the battery arrangement area 115. As a result, the lower cross member 72 is disposed between the first module 121 and the second module 122 in the vehicle body front-rear direction. In the embodiment, an example in which the first module 121 and the second module 122 are arranged as a pair in the vehicle front-rear direction has been described, but this is not limiting. As another example, the first modules 121 and the second modules 122 may be arranged in three or more rows in the vehicle front-rear direction.

[0069] 3, 10, and 11, an upper cross member 73 is provided between the first module 121 and the second module 122. The upper cross member 73 is provided above and along the lower cross member 72. The upper cross member 73 is placed on an upper end 124a of a vertical connecting collar 124 and a step portion 123a of the battery 123. The vertical connecting collar 124 has a lower end 124b joined to the lower cross member 72. In this state, the fastening bolt (fastening member) 127 penetrates from above through the flange 73a of the upper cross member 73, the battery 123, the mounting portion 72a of the lower cross member 72, and the upper portion of the tray floor portion 75. A threaded portion 127a of the fastening bolt 127 that penetrates protrudes into the hollow portion 88 and is fastened to a fastening nut 129. Note that in the embodiment, the fastening bolt 127 is illustrated as an example of the fastening member, but is not limited thereto. As another example, for example, a rivet or the like may be used as the fastening member.

[0070] As a result, the lower cross member 72 is fixed to the tray floor 75 in the hollow portion 88 by fastening bolts 127 and fastening nuts 129. The lower cross member 72 is also fastened to a plurality of batteries 123 (i.e., battery modules 62) in the hollow portion 88 by fastening bolts 127 and fastening nuts 129. Furthermore, the upper cross member 73 is connected to the lower cross member 72 and the tray floor 75 by fastening bolts 125, upper and lower connecting collars 124, and fastening nuts 129.

[0071] In addition, the multiple batteries 123 (battery modules 62) are sandwiched in the vertical direction between the upper cross member 73 and the mounting portion 72a of the lower cross member 72 in the hollow portion 88. In this state, the multiple batteries 123 are fastened to the tray floor portion 75 with fastening bolts 127 and fastening nuts 129. As a result, the multiple batteries 123 are fixed from above by the upper cross member 73. That is, the upper cross member 73 fixes the multiple batteries 123 arranged in the vehicle body fore-and-aft direction from above at the center of the battery module 62 in the vehicle body fore-and-aft direction, and also fixes the multiple batteries 123 arranged in the vehicle width direction from above. Furthermore, the multiple batteries 123 arranged in the vehicle width direction are connected at the front end portion 62a of the battery module 62 by a front connecting bracket 131. Furthermore, the multiple batteries 123 arranged in the vehicle width direction are connected at the rear end portion 62b of the battery module 62 by a rear connecting bracket (not shown).

[0072] In this manner, multiple batteries 123 (i.e., battery modules 62) are placed in the battery arrangement region 115, and the battery modules 62 are fixed from above by the upper cross members 73 at the center in the front-rear direction of the vehicle body (see also FIG. 4). This allows the battery modules 62 (i.e., multiple vertically elongated batteries 123) to be stably fixed, and in addition, the battery modules 62 are connected together while ensuring their rigidity.

[0073] (Battery auxiliary equipment) As shown in FIGS. 4 and 10, an upper deck 74 is provided above the battery module 62 in the center in the vehicle width direction. The upper deck 74 is formed in a band shape and extends in the front-rear direction of the vehicle body from the front end 62a to the rear end 62b of the battery module 62. The upper deck 74 is provided with battery accessories 63 such as a high-voltage junction board and an ECU (electronic control unit). The high-voltage junction box is, for example, an auxiliary device that supplies electricity from the drive battery module 62 to a drive motor (not shown). The ECU is, for example, a battery management unit that controls discharging and charging between the drive battery module 62 and the drive motor.

[0074] 4, 6, and 8, the battery module 62, the battery accessories 63, etc. are housed (disposed) in the case main body 65. In this state, the case cover 66 is attached to the frame body 77 from above with fastening bolts 111 via a sealing material 135. As a result, the inside of the battery case 61 is formed as an airtight space by the battery tray 71 and the case cover 66. The battery module 62 is housed in the airtight space of the battery case 61 (see also FIG. 5).

[0075] Furthermore, the case cover 66 has a raised portion 68 that extends in the front-rear direction of the vehicle body along the upper deck 74 at the center in the vehicle width direction. The upper deck 74 and the battery accessories 63 are stored from below in the raised portion 68. The battery pack 20 is assembled in this state, and is attached under the floor of the vehicle Ve (see FIG. 1).

[0076] (Installation of battery pack 20 under the floor of the vehicle) 2, 3 and 6, a right frame 96 of the battery pack 20 is fixed from below to the inner panel 32 of the right side sill 31. A left frame 97 is fixed from below to the inner panel 32 of the left side sill 31. The front frame 94 is fixed to the right branch portion 38 and the left branch portion 38 via a right front support bracket 102 and a left front support bracket 102. The rear frame 95 is fixed to the fourth floor cross member 47 via a right rear support bracket 104, a right connecting bracket 105, a left rear support bracket 104, and a left connecting bracket 105.

[0077] 3 and 11, head 125a of fastening bolt 125 passes through through hole 141 of case cover 66 and contacts upper floor panel 23. In addition, rubber member 142 provided on head 125a passes through through hole 141 of case cover 66 and contacts upper floor panel 23. The female thread 144 of the head 125a is disposed downward to match with the mounting hole 145 of the floor panel 23. A fastening bolt 146 is threadedly coupled to the female thread 144 of the head 125a through the mounting hole 145 of the floor panel 23. The head 146a of the fastening bolt 146 protrudes upward from the through holes 55a-58a at the tops of the first to fourth floor vertical frames 55-58.

[0078] Here, the first to fourth vertical floor frames 55 to 58 have left and right flanges joined to the floor panel 23. Therefore, the upper cross member 73 and the lower cross member 72 of the battery pack 20 are fixed to the first to fourth vertical floor frames 55 to 58 via the floor panel 23. As a result, the battery pack 20 is assembled under the floor of the vehicle Ve in a state where it is stably fixed below the floor panel 23.

[0079] As described above, the vehicle battery pack 20 according to the embodiment provides the following functions and effects. That is, as shown in Fig. 3 to Fig. 5, the battery module 62 is placed in the battery arrangement area 115 of the battery tray 71, and the cooling passage 85 is extended in the vehicle front-rear direction inside the battery arrangement area 115. Therefore, the battery arrangement area 115 (floor portion 76) also serves as a water jacket for the battery pack 20. This allows, for example, a water supply connector 86 and a drainage connector 87 that connect the cooling passage to a cooling radiator (not shown) to be disposed on the vehicle front side of the battery module 62. This allows the water supply connector 86, the drainage connector 87, and the cooling passage 85 (for example, cooling piping) to be prevented from protruding outward in the vehicle width direction of the battery module 62. This makes it possible to protect the water supply connector 86, the drain connector 87, and the cooling passage 85 against a load F input from the side of the vehicle body due to a side collision (hereinafter also referred to as a side impact load F). This makes it possible to prevent the cooling water from entering the battery module 62 side from the water supply connector 86, the drain connector 87, and the cooling passage 85, for example.

[0080] Furthermore, an impact absorbing region 116 is provided on the battery tray 71 on the outer side in the vehicle width direction of the battery arrangement region 115. Therefore, for example, when a side impact load F is input from the side of the vehicle body, the impact absorbing region 116 can absorb the side impact load F to protect the battery module 62. This eliminates the need to unnecessarily reinforce the outer portion of the vehicle Ve (specifically, the side sill 31), and can reduce the weight of the vehicle Ve. Furthermore, since the battery arrangement region 115 also serves as a water jacket, the floor 76 and the cooling passage 85 can be integrally molded (formed), thereby making it possible to reduce the weight and cost of the battery pack 20.

[0081] Further, a first hollow chamber 81 is provided inside the floor portion 76, and the cooling passage 85 is formed in the first hollow chamber 81. Therefore, the cooling passage 85 can be formed outside the sealed space of the battery case 61 that houses the battery module 62, and the cooling passage 85 can be separated from the battery module 62. This makes it unnecessary to take into consideration (measure) the reliability of manufacturing quality and strength due to water leakage from the cooling passage 85, for example, and allows costs and weight to be reduced.

[0082] 5 and 6, the cooling passage 85 is formed in a U-shape (including an approximately U-shape) by the pair of first hollow chambers 81 by communicating from one first hollow chamber 81 to the other first hollow chamber 81. Therefore, for example, the water supply port and the drain port of the cooling passage 85 can be arranged on the vehicle body front side of the floor portion 76 (specifically, the battery arrangement area 115). The water supply port is connected to a water supply connector 86. The drain port is connected to a drain connector 87. This allows, for example, the water supply connector 86 and the drain connector 87 to be arranged together on the vehicle body front side of the battery arrangement area 115. Therefore, for example, in the engine compartment of the vehicle Ve, the water supply connector 86 and the water drain connector 87, which connect the cooling passage 85 to a radiator for cooling, can be disposed at the shortest distance from the radiator for cooling.

[0083] Furthermore, by arranging the water supply connector 86 and the drainage connector 87 together on the vehicle body front side of the battery arrangement area 115, the water supply connector 86 and the drainage connector 87 can be gathered in one place. This allows, for example, to simplify the support parts for the water supply connector 86 and the drainage connector 87, thereby enabling the weight and cost of the battery pack 20 to be reduced.

[0084] In the embodiment, the water inlet and the drain outlet of the cooling passage 85 are disposed on the vehicle body front side of the battery arrangement area 115, but this is not limited to this. As another example, the water inlet and the drain outlet of the cooling passage 85, the water inlet connector 86, and the drain connector 87 may be disposed on the vehicle body rear side of the battery arrangement area 115.

[0085] 5 and 8, a plurality of first hollow chambers 81 and a plurality of second hollow chambers 82 are formed integrally with the floor portion 76. Also, a plurality of frame hollow chambers 112 are formed integrally with the right frame 96. Therefore, for example, the floor portion 76 and the right frame 96 can be formed by extrusion molding.

[0086] Here, for example, it is also conceivable to form the floor portion 76 and the right frame 96 by press molding. In this case, however, when changing, for example, the battery arrangement region 115 and the shock absorbing region 116 in accordance with the size and shape (i.e., size) of the battery module 62, it is necessary to change (modify) the entire mold for press molding, which is an obstacle to reducing costs. Therefore, the floor section 76 and the right frame 96 are formed by extrusion molding. This makes it possible to change the floor section 76 and the right frame 96 at low cost to match the size and shape (dimension) of the battery module 62 by changing (modifying) the extrusion nozzle of the extrusion molding device.

[0087] Furthermore, by forming the floor section 76 and the right side frame 96 by extrusion molding in the longitudinal direction of the vehicle body, the floor section 76 and the right side frame 96 can be extended in the longitudinal direction of the vehicle body with a hollow cross section of a constant thickness. This makes it possible to uniformize the effect of absorbing the impact energy by, for example, the right side frame 96 (specifically, the protruding portion 108) and the impact absorbing region 116 in response to a side impact load F input due to a side collision.

[0088] Furthermore, by forming the floor section 76 and the right side frame 96 by extrusion molding in the front-rear direction of the vehicle body, it is possible to change the thickness of, for example, the right side protrusion 108 and the impact absorbing region 116. This makes it possible to adjust the deformation mode of, for example, the right side protrusion 108 and the impact absorbing region 116 in response to a side impact load F input due to a side collision, thereby adjusting the impact energy absorption effect.

[0089] Also, the right frame 96 (specifically, the protruding portion 108) is formed to be thinner than the impact absorbing region 116, and further, an inclined portion is formed in the lower portion 116a of the impact absorbing region 116 as an easily deformable portion 118. Therefore, the side impact load F inputted due to a side collision causes the impact absorbing region 116 to deform downward and the right protruding portion 108 to be crushed (compressed), thereby making it possible to effectively absorb the impact energy. This allows the right-side projection 108 and the shock absorbing region 116 (ie, the battery pack 20) ​​to be lighter in weight, and further allows the shock energy absorption effect to be improved.

[0090] In addition, for example, by ensuring the thickness of the impact absorbing region 116, it is possible to suitably suppress deformation of the impact absorbing region 116. This makes it possible to satisfactorily protect the battery module 62 against the side impact load F input due to a side collision.

[0091] Furthermore, a thin portion 113a is formed in the center of the cross section of the overhanging portion 108 in the right frame 96. Therefore, the overhanging portion 108 can be crushed from the center of the cross section by the side impact load F inputted in a side collision. As a result, the crushing of the overhanging portion 108 by the side impact load F occurs all over the overhanging portion 108, thereby improving the impact energy absorption effect.

[0092] As shown in Figs. 4, 9 and 12, the right frame 96, particularly the lower part (lower surface) 108c of the overhanging part 108, is disposed at a position lower in the up-down direction than the lower part (lower surface) 115a of the battery arrangement area 115. Therefore, the overhanging part 108 of the right frame 96 can be used as a first grounding point for, for example, a slope of the road surface or a protrusion on the road surface. This makes it possible to prevent damage to or contact with the battery arrangement area 115 due to the slope or protrusion by the overhanging part 108 of the right frame 96. Furthermore, by bringing the overhanging part 108 of the right frame 96 into contact with the slope of the road surface or a protrusion on the road surface earlier than the battery arrangement area 115, etc., the contact with the slope or protrusion can be conveyed to the driver intuitively.

[0093] In addition, a plurality of vertically long batteries 123 constituting the battery module 62 are arranged in the front-rear direction of the vehicle. Furthermore, the plurality of vertically long batteries 123 are fixed from above by the upper cross member 73. This allows the plurality of vertically long batteries 123 (i.e., the battery modules 62) to be stably fixed to the battery arrangement region 115. Furthermore, by arranging the vertically long batteries 123 in the vehicle front-rear direction, the width of the battery module 62 (i.e., the battery arrangement area 115) in the vehicle width direction can be kept narrow. Therefore, a space for forming the impact absorbing area 116 can be secured between the battery arrangement area 115 and the protruding portion 108 of the right frame 96. As a result, the impact absorbing area 116 can protect the battery module 62 from a side collision load.

[0094] Of the overhanging portion 108 of the right frame 96, the case cover 66 is fixed to the cover mounting portion 108a on the side of the battery module 62. In addition, the side sill mounting portion 108b of the overhanging portion 108 is fixed to the bottom portion 32a of the inner panel 32 of the side sill 31. Therefore, a deformation allowance space 152 that allows the overhanging portion 108 to be crushed can be secured between the cover mounting portion 108a and the side sill mounting portion 108b above the right frame 96 (specifically, the overhanging portion 108). This allows the overhanging portion 108 to be crushed well by the side impact load F input due to a side impact, and the impact energy absorption effect can be improved.

[0095] Furthermore, the water supply connector 86, the drain connector 87, and the cooling passage 85 (see FIG. 7) can be removed from the deformation allowance space 152 between the cover mounting portion 108a and the side sill mounting portion 108b above the overhanging portion 108. This makes it possible to suppress damage to the water supply connector 86, the drain connector 87, and the cooling passage 85 and to suppress water leakage from the water supply connector 86, the drain connector 87, and the cooling passage 85 (see FIG. 7) when the right frame 96 (particularly the overhanging portion) is crushed by a side impact load F.

[0096] 4, 5, and 11, a second hollow chamber 82 is provided inside the floor portion 76, and a hollow portion 88 is formed in the second hollow chamber 82 by isolating it from the cooling passage 85. Furthermore, a plurality of batteries 123 are fastened in the hollow portion 88 with fastening bolts 127. Therefore, the plurality of batteries 123 can be fixed in the battery arrangement region 115 with the fastening bolts 127 that avoid the cooling passage 85, and damage to the cooling passage 85 can be suppressed. Furthermore, by fixing the multiple batteries 123 to the battery arrangement region 115, the multiple batteries 123 (i.e., the battery modules 62) can be directly contacted with the battery arrangement region 115. This makes it possible to eliminate the need for a pressing member that presses the battery modules 62 into contact with the cooling passage 85, for example, and thus allows for cost reduction and weight reduction.

[0097] Furthermore, in the floor 76 (battery arrangement area 115), the cooling areas 91 and the hollow areas 92 are arranged alternately in the vehicle width direction. Therefore, the battery arrangement area 115 can be efficiently cooled by the cooling areas 91, and the cooling performance of the cooling area 91 for the battery arrangement area 115 can be improved. Furthermore, by arranging the cooling regions 91 and the hollow regions 92 alternately in the vehicle width direction, the cooling regions 91 can be arranged at intervals in the vehicle width direction. Therefore, by arranging the battery 123 in the front-rear direction of the vehicle body while avoiding the hollow regions 92, the battery 123 can be arranged along the cooling regions 91. This allows the battery 123 to be fixed to the battery arrangement region 115 using the hollow regions 92. In addition, the battery 123 can be efficiently cooled by the cooling regions 91, and the cooling performance of the battery 123 can be improved.

[0098] 5 and 6, a lower cross member 72 is provided at the center of the battery tray 71 in the front-rear direction of the vehicle body, and the lower cross member 72 extends in the vehicle width direction. This allows the lower cross member 72 to support the side impact load F input during a side impact, thereby protecting the battery module 62. Furthermore, the lower cross member 72 is fastened to the battery module 62 in the hollow portion 88 with fastening bolts 127 (see FIG. 11 ). Therefore, for example, twisting of the battery tray 71 can be suppressed by the lower cross member 72. As a result, the lower cross member 72 can suppress variations in the multiple batteries 123 caused by twisting of the battery tray 71.

[0099] The technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

[0100] In addition, within the scope of the invention, the components in the above-described embodiments may be replaced with well-known components, and the above-described modified examples may be combined as appropriate. [Explanation of symbols]

[0101] Vehicle 20 Battery pack (vehicle battery pack) 31 Side sill 32 Inner Panel 32a Bottom of inner panel (bottom of vehicle) 38 Left and right branching sections (bottom of vehicle) 47 4th floor cross member (bottom of vehicle) 62 Battery Module 66 Case cover (lid) 71 Battery Tray 72 Lower cross member 73 Upper cross member 75 Tray floor 76 Floor 77 Frame 81 1st hollow chamber (hollow chamber) 82 Second Vacant Room (Other Vacant Rooms) 85 Cooling passage 88 Cavity 91 Cooling area 92 Cavity area 94 Front frame (front frame) 95 Rear frame (rear frame) 96 Right side frame (side frame) 97 Left side frame (side frame) 108 Overhang 108a Cover mounting part (upper part) 108b Side sill mounting part (outside part) 108c Lower part of overhang (lower part of side frame) 113 Partition Wall 113a Thin section 115 Battery placement area 115a Lower part (bottom surface) of the battery arrangement area 116 Left and right shock absorbing areas (shock absorbing areas) 116a Lower part of the left and right impact absorbing areas 118 Easy-to-deform parts (inclined, thin-walled parts) 123 Battery (vertical battery) 127 Fastening bolts (fastening components)

Claims

1. A floor portion disposed under the floor of the vehicle; a frame body having side frames provided on at least the left and right sides of the floor portion in a vehicle width direction and attached to the vehicle, The battery tray includes: a battery arrangement area provided at the center in the vehicle width direction, on which a battery module including a plurality of batteries is placed; an impact absorbing area provided on an outer side of the battery arrangement area in the vehicle width direction, Within the battery arrangement region, A cooling passage for cooling the battery module is provided extending in the front-rear direction of the vehicle body, The side frame is formed to be thinner than the impact absorbing area, The impact absorbing region has at least one of a sloped portion and a thin portion in a lower portion. A vehicle-mounted battery pack.

2. The frame body is In addition to the side frames, a front frame is provided on a portion of the floor portion on a front side of the vehicle body and attached to the vehicle, and a rear frame is provided on a portion of the floor portion on a rear side of the vehicle body and attached to the vehicle, The side frames, the front frame, and the rear frame form a rectangular frame shape, a lid portion provided on the frame body and forming, together with the battery tray, an enclosed space for accommodating the battery module; The cooling passage includes: The floor portion is formed by a hollow chamber extending in the front-rear direction of the vehicle body.

2. The vehicle battery pack according to claim 1,

3. At least one pair of the hollow chambers is provided inside the floor portion, The cooling passage includes: One hollow chamber is connected to the other hollow chamber, so that the pair of hollow chambers are formed in a U-shape.

3. The vehicle battery pack according to claim 2.

4. The floor section and the side frames are A plurality of hollow chambers extending in the front-rear direction of the vehicle body are integrally formed.

4. The vehicle battery pack according to claim 1, wherein the battery pack is a battery pack for mounting on a vehicle.

5. The side frame has a thin wall portion at the center of the cross section.

5. The vehicle battery pack according to claim 1, wherein the battery pack is a battery pack for mounting on a vehicle.

6. A floor portion disposed under a floor of a vehicle; a frame body having side frames provided on at least the left and right sides of the floor portion in a vehicle width direction and attached to the vehicle, The battery tray includes: a battery arrangement area provided at the center in the vehicle width direction, on which a battery module including a plurality of batteries is placed; an impact absorbing area provided on an outer side of the battery arrangement area in the vehicle width direction, Within the battery arrangement region, A cooling passage for cooling the battery module is provided extending in the front-rear direction of the vehicle body, a lower portion of the side frame is disposed at a position lower than a lower portion of the battery arrangement area in the up-down direction; A vehicle-mounted battery pack.

7. In the battery arrangement region, a plurality of vertically elongated batteries constituting the battery module are arranged with their longitudinal directions aligned in the vehicle front-rear direction, An upper cross member is provided to fix the plurality of batteries placed in the battery arrangement area from above.

7. The vehicle battery pack according to claim 1, wherein the battery pack is a battery pack for mounting on a vehicle.

8. The side frame includes: The cover portion is fixed to an upper portion on the side of the battery module, and has a protruding portion protruding outward in a vehicle width direction from the cover portion, The outer portion of the protruding portion is fixed to the outer side in the vehicle width direction of the vehicle.

4. The vehicle battery pack according to claim 2 or 3.

9. In the battery arrangement region, a plurality of vertically elongated batteries constituting the battery module are arranged with their longitudinal directions aligned in the vehicle front-rear direction, a cavity formed by another cavity that is isolated from the cavity that forms the cooling passage and extends in the vehicle front-rear direction, The battery is fastened in the cavity by a fastening member.

9. The vehicle-mounted battery pack according to claim 2, 3 or 8.

10. The battery arrangement region is The cooling passage includes a cooling region, and the cavity portion includes a cavity region, the cooling region and the cavity region being alternately arranged in a vehicle width direction.

10. The vehicle battery pack according to claim 9.

11. a lower cross member that is provided at a center of the battery tray in the vehicle front-rear direction and extends in a vehicle width direction and is attached to the battery tray; The lower cross member is fastened to the battery module in the cavity by the fastening member.

11. The vehicle-mounted battery pack according to claim 9 or 10.

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