Vehicle power storage device and power storage device mounting structure

Abstract

To obtain a vehicle power storage device and a power storage device mounting structure capable of improving protection performance of a battery module in a configuration including a plurality of battery modules.SOLUTION: A vehicle power storage device 10 includes: a battery module group 37 configured by arranging a plurality of battery modules 36 housing a plurality of battery cells along one direction; and a mounting bracket 40 extending in one direction to couple the plurality of battery modules 36 and fixed to a beam-like member 28 extending in one direction.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a vehicle power storage device and a power storage device mounting structure. [Background technology]

[0002] Patent Document 1 discloses an energy storage device in which a plurality of energy storage units (battery modules) are arranged in a battery case. In the energy storage device disclosed in Patent Document 1, a plurality of beam members (beam-shaped members) are arranged in the battery case, and the energy storage units are fastened to the beam members with bolts via a plurality of second members provided on the energy storage units. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-064815 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the structure disclosed in Patent Document 1, the second members for fastening the energy storage unit to the beam-like member are scattered on the side walls of the energy storage unit, and therefore, in the event of a vehicle collision, the second members cannot bear the collision load, and the beam-like member may buckle.

[0005] In consideration of the above, an object of the present invention is to provide a vehicle power storage device and a power storage device mounting structure that can improve the protection performance of the battery modules in a configuration including a plurality of battery modules. [Means for solving the problem]

[0006] The vehicle energy storage device according to claim 1 includes a battery module group configured by arranging a plurality of battery modules along one direction, each battery module housing a plurality of battery cells, and a mounting bracket extending in the one direction to connect the plurality of battery modules and fixed to a beam-shaped member extending in the one direction.

[0007] In the vehicle energy storage device according to claim 1, a battery module contains multiple battery cells, and a battery module group is formed by arranging multiple battery modules in one direction. The battery modules constituting the battery module group are fixed to a beam-shaped member extending in one direction via a mounting bracket. The mounting bracket connects the multiple battery modules and extends in one direction. This allows, for example, when a collision load is applied in one direction during a vehicle collision, the collision load can be borne by both the beam-shaped member extending in one direction and the mounting bracket, thereby suppressing buckling of the beam-shaped member. As a result, the collision load can be suppressed from being applied to the battery modules.

[0008] A vehicle power storage device according to a second aspect of the present invention is based on the first aspect, wherein the mounting bracket is formed to be longer than the length in the one direction of at least one of the battery modules that constitute the battery module group.

[0009] In the vehicle power storage device according to claim 2, the mounting bracket is longer than the length of the battery module in one direction, which reduces buckling of the beam-like member compared to a configuration in which the mounting bracket is shorter than the battery module.

[0010] The vehicle power storage device according to claim 3 is based on claim 1, and the mounting bracket is formed to be longer than the length of the battery module group in the one direction.

[0011] In the vehicle power storage device according to claim 3, the length of the mounting bracket is longer than the length of the battery module group formed by arranging a plurality of battery modules, and therefore the beam-like member is reinforced by the mounting bracket over the entire area of ​​the battery module group.

[0012] A fourth aspect of the present invention provides the vehicle power storage device according to the third aspect, wherein both end portions of the mounting bracket protrude in the one direction beyond the group of battery modules in a state in which the plurality of battery modules are connected.

[0013] In the vehicle energy storage device according to claim 4, both ends of the mounting bracket protrude in one direction beyond the battery module group, so that when a load is applied in one direction, the load is applied to the mounting bracket before the battery modules, thereby suppressing the load from being applied to the battery modules.

[0014] A vehicle power storage device according to a fifth aspect of the present invention is based on the first aspect of the present invention, and wherein the mounting bracket is fixed to an upper surface of the beam-like member.

[0015] In the vehicle electric power storage device according to claim 5, the mounting bracket is fixed to the upper surface of the beam-like member, whereby the load transfer path of the collision load is dispersed vertically by the beam-like member and the mounting bracket.

[0016] The vehicle energy storage device according to claim 6 is the same as claim 1, in which the battery module groups are stacked in the vertical direction of the vehicle, and the battery module group on the upper side of the vehicle and the battery module group on the lower side of the vehicle are connected via the mounting bracket.

[0017] In the vehicle power storage device according to claim 6, the battery modules are connected in the vertical direction by mounting brackets for fixing to the beam-shaped members, so that many battery modules can be connected without increasing the number of parts.

[0018] A seventh aspect of the present invention provides the vehicle power storage device of the sixth aspect, wherein a heat dissipation panel is interposed between the battery module group on the upper side of the vehicle and the battery module group on the lower side of the vehicle.

[0019] In the vehicle power storage device according to claim 7, the heat dissipation panel absorbs the heat of the battery module, thereby suppressing a rise in the temperature of the battery module.

[0020] The energy storage device mounting structure of claim 8 comprises an energy storage device for a vehicle according to any one of claims 1 to 7, and a beam-shaped member extending in the vehicle width direction and installed between skeletal members, wherein the mounting bracket extends in the vehicle width direction and is fixed to the beam-shaped member, and the beam-shaped member protrudes in the vehicle width direction beyond the group of battery modules when the mounting bracket connects the plurality of battery modules.

[0021] In the energy storage device mounting structure according to claim 8, the beam members extend in the vehicle width direction and are bridged between the frame members. Furthermore, since the beam members protrude further in the vehicle width direction than the battery module group, when a load is input to the side of the vehicle, the load is input to the beam members before it is input to the battery module group, thereby suppressing input of the load to the battery module group.

[0022] The electric storage device mounting structure according to claim 9 is the same as claim 8, further comprising rockers extending in the vehicle front-rear direction on both sides in the vehicle width direction, and the beam-like member and the mounting bracket overlap with the rockers when viewed in the vehicle width direction.

[0023] In the electricity storage device mounting structure according to claim 9, a collision load input to the rocker during a side collision of the vehicle is transmitted to both the beam-like member and the mounting bracket.

[0024] The storage device mounting structure according to claim 10 is the same as claim 9, in which an impact absorbing member is provided outside the rocker in the vehicle width direction, and the impact absorbing member overlaps the entire beam-shaped member and the lower part of the mounting bracket when viewed from the vehicle width direction.

[0025] In the electric storage device mounting structure according to claim 10, the impact absorbing member absorbs a portion of the collision load input during a side collision. Furthermore, the impact absorbing member overlaps the entire beam member and the lower portion of the mounting bracket when viewed from the vehicle width direction. This distributes the load that cannot be absorbed by the impact absorbing member to both the beam member and the mounting bracket. Here, the beam member installed between the frame members bears more of the load, thereby suppressing breakage of the mounting bracket.

[0026] The storage device mounting structure of claim 11 is the same as claim 8, and further comprises a vertical reinforcement positioned between the battery modules and extending in the fore-and-aft direction of the vehicle, and the mounting bracket is fixed to the beam-shaped member and the vertical reinforcement.

[0027] In the energy storage device mounting structure according to claim 11, the mounting bracket is fixed to the beam-like member and the vertical reinforcement, so that the load input to the mounting bracket is dispersed in the fore-and-aft direction of the vehicle via the beam-like member and the vertical reinforcement, thereby making it possible to suppress buckling of the beam-like member and the mounting bracket.

[0028] The storage device mounting structure of claim 12 is the same as claim 8, in that the battery module groups are arranged in the fore-and-aft direction of the vehicle, sandwiching the beam-shaped member, and the battery module group on the front side of the vehicle and the battery module group on the rear side of the vehicle are each fixed to the beam-shaped member via the mounting bracket.

[0029] In the energy storage device mounting structure according to claim 12, battery module groups are arranged in front of and behind a beam-shaped member, and each battery module group is fixed to the beam-shaped member by a mounting bracket. As a result, two mounting brackets are fixed to the beam-shaped member, which suppresses buckling of the beam-shaped member compared to a configuration in which one mounting bracket is fixed. [Effects of the Invention]

[0030] As described above, the vehicle power storage device and power storage device mounting structure according to the present invention can improve the protection performance of the battery module. [Brief explanation of the drawings]

[0031] [Figure 1] 1 is a perspective view showing a main part of a vehicle equipped with a vehicle power storage device according to an embodiment; [Figure 2] 1 is an exploded perspective view of a vehicle power storage device according to an embodiment of the present invention; [Figure 3] 1 is a plan view of a vehicle power storage device according to an embodiment of the present invention; [Figure 4] 2 is an enlarged perspective view of a main part of the vehicle power storage device according to the embodiment; FIG. [Figure 5] FIG. 2 is a perspective view showing a battery module group and a mounting bracket according to the embodiment. [Figure 6] FIG. 6 is a cross-sectional view taken along line 6-6 in FIG. 2. DETAILED DESCRIPTION OF THE INVENTION

[0032] A vehicle power storage device 10 and a mounting structure for a power storage device according to an embodiment will be described with reference to the drawings. Note that the arrows UP, FR, and RH shown as appropriate in each drawing respectively indicate the upward direction in the vehicle vertical direction, the forward direction in the vehicle longitudinal direction, and the right direction in the vehicle lateral direction (vehicle width direction) of a vehicle V on which the vehicle power storage device 10 is mounted. Furthermore, in the following description, when the directions up and down, front and rear, and left and right are simply used, they will respectively indicate front and rear in the vehicle longitudinal direction, up and down in the vehicle vertical direction, and left and right in the vehicle lateral direction (vehicle width direction), unless otherwise specified.

[0033] Fig. 1 is a perspective view showing a main part of a vehicle V equipped with a vehicle power storage device 10 according to an embodiment. As shown in Fig. 1, a pair of left and right rockers 12 are provided in the center of the vehicle V in the vehicle longitudinal direction. The rockers 12 extend in the vehicle longitudinal direction on both sides in the vehicle width direction and constitute skeletal members with a closed cross-sectional structure.

[0034] The front ends of the rockers 12 are connected by a front cross member 14 extending in the vehicle width direction. The rear ends of the rockers 12 are connected by a rear cross member 16 extending in the vehicle width direction, so that the longitudinal center portion of the vehicle V is formed into a substantially rectangular frame shape in plan view by the rockers 12, the front cross member 14, and the rear cross member 16.

[0035] A front module FM that constitutes a power unit compartment is provided further forward of the rocker 12, and a rear module RM that constitutes the rear of the vehicle V is provided further rearward of the rocker 12. Details of the front module FM and the rear module RM will not be explained here. The front module FM and the rear module RM may each be formed by welding a plurality of skeletal members together, or some of the skeletal members may be formed integrally by casting or the like.

[0036] Here, a vehicle power storage device 10 is provided within a frame formed by the rocker 12, the front cross member 14, and the rear cross member 16. The vehicle power storage device 10 is configured to be able to store electric power to be supplied to a motor that is a drive source of the vehicle V. Note that the vehicle V in this embodiment is an electric vehicle (BEV: Battery Electric Vehicle), which runs on power generated by a power unit, a fuel cell electric vehicle (FCEV: Fuel Cell Electric Vehicle), a hybrid vehicle (HEV: Hybrid Electric Vehicle), a plug-in hybrid electric vehicle (PHEV: Plug-in Hybrid Electric Vehicle), or the like.

[0037] 2 is an exploded perspective view of a vehicle power storage device 10 according to an embodiment. The vehicle power storage device 10 of this embodiment includes, as an example, a battery case 20. The battery case 20 is a box-shaped member formed into a substantially rectangular shape in a plan view, and includes a front wall portion 20A extending in the vehicle width direction in front of the vehicle, a rear wall portion 20B extending in the vehicle width direction in the vehicle rear, and a pair of side wall portions 20C connecting both end portions of the front wall portion 20A and the rear wall portion 20B in the front-rear direction.

[0038] Two cross-side brackets 22 are provided on the front surface of the front wall portion 20A, spaced apart in the vehicle width direction. Each cross-side bracket 22 is formed in a substantially L-shape when viewed in the vehicle width direction, and a portion extending in the vehicle vertical direction is fixed to the front wall portion 20A. In addition, a portion of the cross-side bracket 22 extending in the vehicle longitudinal direction is fixed to the lower surface of the front cross member 14 (see FIG. 1).

[0039] A rocker-side bracket 24 is provided on the side wall 20C of the battery case 20. The rocker-side bracket 24 is formed to have approximately the same length as the side wall 20C, extends in the vehicle longitudinal direction, and is formed in a substantially L-shape when viewed from the vehicle longitudinal direction. The portions of the rocker-side bracket 24 that extend in the vertical direction are fixed to the side wall 20C. The portion of the rocker-side bracket 24 that extends in the vehicle width direction is fixed to the underside of the rocker 12 (see FIG. 1).

[0040] Here, the bottom wall of the battery case 20 is provided with a plurality of vertical reinforcements 26 extending in the vehicle longitudinal direction, and a plurality of horizontal reinforcements 28 as beam-shaped members extending in the vehicle width direction (one direction).

[0041] Two vertical reinforcements 26 are provided at the front of the battery case 20, spaced apart in the vehicle width direction, and two are provided at the rear of the battery case 20, spaced apart in the vehicle width direction. Two more vertical reinforcements 26 are also provided at the center of the battery case 20 in the vehicle front-rear direction, spaced apart in the vehicle width direction. These vertical reinforcements 26 are located between battery modules 36 that are adjacent in the vehicle width direction. The battery modules 36 will be described later.

[0042] The lateral reinforcements 28 are provided at positions that divide the battery case 20 into three equal parts in the vehicle longitudinal direction. Specifically, the lateral reinforcement 28 provided on the front side is provided between the front vertical reinforcement 26 and the central vertical reinforcement 26. Furthermore, the lateral reinforcement 28 provided on the rear side is provided between the central vertical reinforcement 26 and the rear vertical reinforcement 26. Furthermore, each of the two lateral reinforcements 28 is formed to be longer in the vehicle vertical direction than the vertical reinforcement 26.

[0043] 1, the battery case 20 includes a cover 30, and a battery pack 34 is housed inside the battery case 20. In addition, devices 32 are provided on the upper surface of the cover 30 at the rear of the battery case 20. The devices 32 include, for example, an ECU (Electronic Control Unit), a BMS (Battery Management System), and a JB (Junction Box).

[0044] 2, the battery pack 34 is configured to include a plurality of battery modules 36. In the present embodiment, as an example, the battery pack 34 is configured to include 18 battery modules 36. Each battery module 36 is modularized in a state where a plurality of cells are stacked.

[0045] Six battery modules 36 are housed in the area surrounded by the front wall 20A, the front lateral reinforcement 28, and the side wall 20C of the battery case 20. Six battery modules 36 are also housed in the area surrounded by the front and rear lateral reinforcements 28 and the side wall 20C. Furthermore, six battery modules 36 are housed in the area surrounded by the rear wall 20B, the rear lateral reinforcement 28, and the side wall 20C. In this way, the battery modules 36 are arranged on both the front and rear sides of the lateral reinforcement 28, with the lateral reinforcement 28 in between.

[0046] Here, the multiple battery modules 36 are connected in the vehicle width direction by a front mounting bracket 40 and a rear mounting bracket 41. Specifically, three battery modules 36 arranged along the vehicle width direction are connected in the vehicle width direction by the front mounting bracket 40 and the rear mounting bracket 41 to form a battery module group 37.

[0047] The front mounting bracket 40 is attached to the front end of the battery module 36, and the rear mounting bracket 41 is attached to the rear end of the battery module 36. The battery modules 36 arranged one above the other are connected by the front mounting bracket 40 and the rear mounting bracket 41. In other words, the front mounting bracket 40 and the rear mounting bracket 41 connect the upper battery module group 37 and the lower battery module group 37 together.

[0048] 3 is a plan view of the vehicle energy storage device 10 according to the embodiment. As shown in this Fig. 3, a front mounting bracket 40 is attached to the front end of the battery module 36, and a rear mounting bracket 41 is attached to the rear end of the battery module 36.

[0049] Here, the battery module groups 37 are arranged adjacent to each other in the fore-and-aft direction of the vehicle with the lateral reinforcement 28 in between, and the front mounting bracket 40 of the battery module 36 arranged on the rear side and the rear mounting bracket 41 of the battery module 36 arranged on the front side are fixed to the lateral reinforcement 28.

[0050] In this embodiment, as an example, the front mounting bracket 40 and the rear mounting bracket 41 are formed in the same shape, and the front mounting bracket 40 is flipped 180 degrees in a plan view and attached to the battery module 36 to form the rear mounting bracket 41.

[0051] In addition, the front mounting bracket 40 is configured to include a base portion 40A, a load transmission portion 40B, and a vertical fixing portion 40C, and the rear mounting bracket 41 is configured to include a base portion 41A, a load transmission portion 41B, and a vertical fixing portion 41C.

[0052] The base portion 40A of the front mounting bracket 40 extends in the vehicle width direction. A plurality of load transmission portions 40B protrude from the base portion 40A toward the front of the vehicle. In this embodiment, as an example, six load transmission portions 40B are provided on the front mounting bracket 40. The load transmission portions 40B are arranged at intervals along the vehicle width direction, and in this embodiment, as an example, the load transmission portions 40B are provided at positions corresponding to corners of the battery module 36.

[0053] The vertical fixing portions 40C are provided between the right-side battery module 36 and the central battery module 36, and between the left-side battery module 36 and the central battery module 36, and extend from the base portion 40A toward the rear of the vehicle. The vertical fixing portions 40C are fastened to the vertical reinforcement 26 by bolts (not shown).

[0054] The base portion 41A of the rear mounting bracket 41 extends in the vehicle width direction. A plurality of load transmission portions 41B protrude from the base portion 41A toward the rear of the vehicle. In this embodiment, as an example, six load transmission portions 41B are provided on the rear mounting bracket 41. The load transmission portions 41B are arranged at intervals along the vehicle width direction, and in this embodiment, as an example, the load transmission portions 41B are provided at positions corresponding to corners of the battery module 36. The load transmission portions 41B are arranged alternately with the load transmission portions 40B of the front mounting bracket 40.

[0055] The vertical fixing portions 41C are provided between the right-side battery module 36 and the central battery module 36, and between the left-side battery module 36 and the central battery module 36, respectively, and extend from the base portion 41A toward the front of the vehicle. The vertical fixing portions 41C are fastened to the vertical reinforcement 26 with bolts (not shown).

[0056] Fig. 4 is an enlarged perspective view of essential parts of the vehicle power storage device 10 according to the embodiment. As shown in Fig. 4, a bolt 44 is inserted into the load transmission portion 40B of the front mounting bracket 40 from above the vehicle, and the load transmission portion 40B is fixed to the lateral reinforcement 28 by this bolt 44. In addition, a bolt 44 is also inserted into the load transmission portion 41B of the rear mounting bracket 41 from above the vehicle, and the load transmission portion 41B is fixed to the lateral reinforcement 28 by this bolt 44 (see Fig. 3).

[0057] Here, bolts 46 are inserted into the front corners of the upper battery module 36, and these bolts 46 are screwed into the base portion 40A, thereby fastening the upper battery module 36 to the front mounting bracket 40.

[0058] Fig. 5 is a perspective view showing a battery module group 37 and a front mounting bracket 40 in the embodiment. As shown in Fig. 5, the battery module group 37 arranged on the lower side has bolts (not shown) inserted into the four corners of the battery modules 36, similar to the battery module group 37 on the upper side, and the lower battery module group 37 is fastened to the front mounting bracket 40 by screwing the bolts into the base portion 40A from below.

[0059] Here, a heat dissipation panel 62 capable of absorbing heat from the battery modules 36 is interposed between the battery module group 37 on the upper side of the vehicle and the battery module group 37 on the lower side of the vehicle. The heat dissipation panel 62 is formed in a substantially rectangular shape in a plan view, and the length of the heat dissipation panel 62 in the front-to-rear direction of the vehicle is approximately the same as the length of the battery module 36. In addition, the length of the heat dissipation panel 62 in the vehicle width direction is approximately the same as the length of the battery module group 37 in the vehicle width direction.

[0060] The radiator panel 62 may have, for example, a refrigerant flow path inside. In this case, a cooling circuit (not shown) is constructed through the radiator panel, and the refrigerant is circulated to cool the surface of the radiator panel 62. In other words, the radiator panel 62 can remove heat from the battery module group 37.

[0061] Three adhesive layers 64 are formed on the upper surface of the heat dissipation panel 62. Each adhesive layer 64 is formed at a position corresponding to a battery module 36, and the battery module 36 is adhered to these adhesive layers 64 from above the vehicle. The adhesive layers 64 may be approximately the same size as the bottom area of ​​the battery module 36, or may be smaller than the bottom area of ​​the battery module 36. An adhesive layer similar to that on the upper surface is formed on the lower surface of the heat dissipation panel 62, and the battery module 36 on the lower side of the vehicle is adhered via the adhesive layer. That is, in this embodiment, the vertically stacked battery module groups 37 are connected vertically via the bolts 46 and the heat dissipation panel 62.

[0062] Fig. 6 is a cross-sectional view taken along line 6-6 in Fig. 2. As shown in Fig. 6, the lateral reinforcement 28 is installed between the rockers 12, and the length of the lateral reinforcement 28 in the vehicle width direction is longer than the battery module group 37.

[0063] A reinforcing portion 21 formed with a substantially L-shaped cross section is provided inside the battery case 20. The reinforcing portion 21 extends in the front-to-rear direction of the vehicle and is joined to the bottom and side wall portions 20C of the battery case 20. The bottom, side wall portions 20C, and reinforcing portion 21 of the battery case 20 form a closed cross section. Note that although FIG. 6 only shows the reinforcing portion 21 on the right side of the vehicle, a similar reinforcing portion is also provided on the left side of the vehicle.

[0064] The lateral reinforcement 28 is installed between the reinforcing portions 21. That is, the right end portion of the lateral reinforcement 28 is joined to the right reinforcing portion 21, and the left end portion of the lateral reinforcement 28 is joined to the left reinforcing portion.

[0065] Furthermore, both end portions of the lateral reinforcement 28 protrude in the vehicle width direction beyond the battery module group 37. Specifically, the right end portion of the lateral reinforcement 28 extends to the right side of the vehicle beyond the battery module group 37. Furthermore, although not shown, the left end portion of the lateral reinforcement 28, like the right end portion, extends to the left side of the vehicle beyond the battery module group 37.

[0066] A weld nut 42 is provided inside the lateral reinforcement 28, and a bolt 44 serving as a fastener is threaded into the weld nut 42. The bolt 44 is inserted into the front mounting bracket 40 from above the vehicle, passes through the front mounting bracket 40, and is threaded into the weld nut 42. In this way, the front mounting bracket 40 is fixed to the upper surface of the lateral reinforcement 28. Although not shown, the rear mounting bracket 41 is also similarly fastened to the lateral reinforcement 28 with a bolt and a weld nut.

[0067] The front mounting bracket 40 is formed to be longer in the vehicle width direction than the battery module group 37, and the right end of the front mounting bracket 40 is located to the right of the rightmost battery module 36. Although not shown, the left end of the front mounting bracket 40 is located to the left of the leftmost battery module 36. For this reason, the front mounting bracket 40 is structured to protrude further in the vehicle width direction than the battery pack 34.

[0068] An impact absorbing member 45 is disposed outward in the vehicle width direction from the rocker 12. Although a cross section of the impact absorbing member 45 is not shown, the impact absorbing member 45 has a shape that is divided into multiple internal spaces so that it can deform when a collision load is input and absorb the collision load. The impact absorbing member 45 extends in the front-to-rear direction of the vehicle adjacent to the rocker 12, and the upper surface of the impact absorbing member 45 is set at a higher position than the lateral reinforcement 28.

[0069] Here, the lateral reinforcement 28 and the front mounting bracket 40 overlap with the rocker 12 when viewed from the vehicle width direction. In addition, the impact absorbing member 45 overlaps with the entire lateral reinforcement 28 and the lower part of the front mounting bracket 40 when viewed from the vehicle width direction.

[0070] (action) Next, the operation of the vehicle power storage device 10 and the power storage device mounting structure according to this embodiment will be described.

[0071] In the vehicle energy storage device 10 and energy storage device mounting structure according to this embodiment, as shown in Fig. 2, a battery module 36 houses a plurality of battery cells, and a plurality of these battery modules 36 are arranged in one direction to form a battery module group 37. Furthermore, as shown in Fig. 3, the battery modules 36 that make up the battery module group 37 are fixed to a lateral reinforcement 28 that extends in one direction via a front mounting bracket 40 and a rear mounting bracket 41.

[0072] Here, the front mounting bracket 40 and the rear mounting bracket 41 connect multiple battery modules 36 and extend in the vehicle width direction. As a result, when a collision load is input in the vehicle width direction during a vehicle collision, for example, the collision load can be borne by both the lateral reinforcement 28 and the mounting brackets (the front mounting bracket 40 and the rear mounting bracket 41), thereby suppressing buckling of the lateral reinforcement 28. As a result, the collision load can be suppressed from being input to the battery modules 36.

[0073] In particular, in this embodiment, battery module groups 37 are arranged in front of and behind the lateral reinforcement 28, and each battery module group 37 is fixed to the lateral reinforcement 28 by mounting brackets (a front mounting bracket 40 and a rear mounting bracket 41). As a result, two mounting brackets, the front mounting bracket 40 and the rear mounting bracket 41, are fixed to the lateral reinforcement 28, which suppresses buckling of the lateral reinforcement 28 compared to a configuration in which only one mounting bracket is fixed. Also, in this embodiment, the load transmission portion 40B of the front mounting bracket 40 and the load transmission portion 41B of the rear mounting bracket 41 are arranged alternately along the vehicle width direction, so that when a collision load is input in the vehicle width direction, the load transmission portion 40B and the load transmission portion 41B come into contact with each other, allowing the collision load to be borne by both the front mounting bracket 40 and the rear mounting bracket 41.

[0074] 6 , in this embodiment, the lateral reinforcement 28 extends in the vehicle width direction and is installed between the rockers 12. Since the lateral reinforcement 28 protrudes further in the vehicle width direction than the battery module group 37, when a load is input to the side of the vehicle, the load is input to the lateral reinforcement 28 before the battery module group 37, thereby suppressing the input of the load to the battery module group 37.

[0075] Furthermore, the front mounting bracket 40 and the rear mounting bracket 41 of this embodiment are longer than the battery module group 37. Therefore, the lateral reinforcement 28 is reinforced by the mounting brackets over the entire area of ​​the battery module group 37. As a result, buckling of the lateral reinforcement 28 can be more effectively suppressed compared to a configuration in which the length of the front mounting bracket 40 and the rear mounting bracket 41 is shorter than the battery module 36 and a configuration in which the length of the front mounting bracket 40 and the rear mounting bracket 41 is shorter than the battery module group 37.

[0076] Furthermore, in this embodiment, both ends of the front mounting bracket 40 and the rear mounting bracket 41 protrude in the vehicle width direction beyond the battery module group 37. Therefore, when a load is input in the vehicle width direction, the load is input to the front mounting bracket 40 and the rear mounting bracket 41 before the battery module 36, thereby suppressing the input of the load to the battery module 36.

[0077] Furthermore, in this embodiment, the front mounting bracket 40 and the rear mounting bracket 41 are fixed to the upper surface of the lateral reinforcement 28. As a result, the load transfer path of the collision load is distributed vertically between the lateral reinforcement 28 and the front mounting bracket 40 and the rear mounting bracket 41. Furthermore, compared to a structure in which the front mounting bracket 40 and the rear mounting bracket 41 are fixed to the front and rear of the lateral reinforcement 28, a larger mounting space for the battery module 36 can be secured.

[0078] Furthermore, in this embodiment, the battery modules 36 are connected in the vertical direction by the front mounting brackets 40 and rear mounting brackets 41 that secure the battery modules 36 to the lateral reinforcement 28. This allows many battery modules 36 to be connected without increasing the number of parts. In other words, there is no need to prepare a dedicated bracket or the like for connecting the battery modules 36.

[0079] Furthermore, in this embodiment, the collision load input to the rocker 12 during a side collision of the vehicle V is transmitted to both the lateral reinforcement 28 and the front mounting bracket 40. Similarly, at the rear of the battery module 36, the collision load input to the rocker 12 during a side collision of the vehicle V is transmitted to both the lateral reinforcement 28 and the rear mounting bracket 41.

[0080] Furthermore, in this embodiment, the impact absorbing member 45 absorbs a portion of the collision load input during a side collision. In addition, the impact absorbing member 45 overlaps the entire lateral reinforcement 28 and the lower parts of the mounting brackets (front mounting bracket 40, rear mounting bracket 41) when viewed from the vehicle width direction. As a result, any load that cannot be absorbed by the impact absorbing member 45 is distributed to both the lateral reinforcement 28 and the mounting brackets. Here, the lateral reinforcement 28 installed between the rockers 12 bears more of the load, thereby suppressing breakage of the mounting brackets.

[0081] In addition, in this embodiment, as shown in FIG. 5, a heat dissipation panel 62 is provided between the upper battery module group 37 and the lower battery module group 37, and this heat dissipation panel 62 absorbs the heat of the battery module 36, thereby suppressing the temperature rise of the battery module 36.

[0082] 3, the front mounting bracket 40 is provided with a vertical fixing portion 40C, which is fastened to the vertical reinforcement 26 by a bolt (not shown). As a result, the load input to the front mounting bracket 40 is dispersed in the fore-and-aft direction of the vehicle via the lateral reinforcement 28 and the vertical reinforcement 26. As a result, buckling of the lateral reinforcement 28 and the front mounting bracket 40 can be suppressed.

[0083] Furthermore, by connecting the lateral reinforcement 28 and the vertical reinforcement 26 with the front mounting bracket 40, the bottom of the battery case 20 is reinforced, and strength against vibrations from the road surface can be improved.

[0084] Although the vehicle power storage device 10 according to the embodiment and the modified example has been described above, it is needless to say that the present invention is not limited thereto and can be embodied in various forms without departing from the spirit of the present invention. For example, in the above embodiment, as shown in Fig. 5, the battery modules 36 are configured such that two are connected vertically, but the present invention is not limited thereto. Also, the battery modules 36 are configured such that three are connected horizontally, but the present invention is not limited thereto.

[0085] In the above embodiment, as shown in Fig. 3, the front mounting bracket 40 and the rear mounting bracket 41 are each formed from a single component extending in the vehicle width direction, but this is not limiting. For example, the mounting brackets may be formed by mechanically connecting multiple components.

[0086] Furthermore, in the above embodiment, the front mounting bracket 40 and the rear mounting bracket 41 are attached to the lateral reinforcement 28 extending in the vehicle width direction, but this is not limiting. For example, mounting brackets extending in the vehicle longitudinal direction may be prepared and attached to the vertical reinforcement. In this case, the load transmission parts are arranged at intervals in the vehicle longitudinal direction, and contact between the load transmission parts during a frontal or rear-end collision of the vehicle prevents the battery module from falling off.

[0087] The following notes are provided regarding the above embodiment.

[0088] (Appendix 1) a battery module group configured by arranging a plurality of battery modules, each housing a plurality of battery cells, along one direction; a mounting bracket extending in the one direction to connect the plurality of battery modules and fixed to the beam-shaped member extending in the one direction; A vehicle power storage device comprising: (Appendix 2) 2. The vehicle power storage device according to claim 1, wherein the mounting bracket is formed to be longer than the length in the one direction of at least one of the battery modules constituting the battery module group. (Appendix 3) 3. The vehicle power storage device according to claim 1, wherein the mounting bracket is formed to be longer than the length of the battery module group in the one direction. (Appendix 4) 4. The vehicle power storage device according to any one of claims 1 to 3, wherein both end portions of the mounting bracket protrude in the one direction beyond the group of battery modules when the plurality of battery modules are connected together. (Appendix 5) 5. The vehicle power storage device according to any one of claims 1 to 4, wherein the mounting bracket is fixed to an upper surface of the beam-like member. (Appendix 6) The battery module group is stacked in the vertical direction of the vehicle, 6. The vehicle power storage device according to any one of claims 1 to 5, wherein the battery module group on the upper side of the vehicle and the battery module group on the lower side of the vehicle are connected via the mounting bracket. (Appendix 7) 7. The vehicle power storage device according to claim 6, wherein a heat dissipation panel is interposed between the battery module group on the upper side of the vehicle and the battery module group on the lower side of the vehicle. (Appendix 8) A vehicle power storage device according to any one of Supplementary Notes 1 to 7; a beam-like member extending in the vehicle width direction and installed between the frame members; and the mounting bracket extends in the vehicle width direction and is fixed to the beam-like member, the beam-shaped member protrudes in the vehicle width direction beyond the battery module group when the plurality of battery modules are connected by the mounting bracket. Structure for mounting a power storage device. (Appendix 9) Rockers are provided on both sides of the vehicle width direction, extending in the vehicle front-rear direction, 9. The electric storage device mounting structure according to claim 8, wherein the beam-like member and the mounting bracket overlap with the rocker when viewed in the vehicle width direction. (Appendix 10) An impact absorbing member is provided on the outer side of the rocker in the vehicle width direction, 10. The electric storage device mounting structure according to claim 9, wherein the impact absorbing member overlaps the entire area of ​​the beam-shaped member and a lower portion of the mounting bracket when viewed in the vehicle width direction. (Appendix 11) a longitudinal reinforcement positioned between the battery modules and extending in the vehicle front-rear direction; 11. The electricity storage device mounting structure according to any one of appendices 8 to 10, wherein the mounting bracket is fixed to the beam-like member and the vertical reinforcement. (Appendix 12) the battery module group is arranged in the vehicle front-rear direction with the beam-shaped member sandwiched therebetween, 12. The energy storage device mounting structure according to any one of claims 8 to 11, wherein the battery module group on the front side of the vehicle and the battery module group on the rear side of the vehicle are fixed to the beam-shaped member via the mounting brackets, respectively. [Explanation of symbols]

[0089] 10 Vehicle power storage device 12 Rocca 26 Vertical reinforcement 28 Lateral reinforcement (beam-like member) 36 Battery Module 37 Battery module group 40 Front mounting bracket 41 Rear mounting bracket 45 Impact absorbing member 62 Heat dissipation panel

Claims

1. a battery module group configured by arranging a plurality of battery modules, each housing a plurality of battery cells, along one direction; a mounting bracket extending in the one direction to connect the plurality of battery modules and fixed to the beam-shaped member extending in the one direction; A vehicle power storage device comprising:

2. The vehicle power storage device according to claim 1, wherein the mounting bracket is formed to be longer than the length in the one direction of at least one of the battery modules constituting the battery module group.

3. The vehicle power storage device according to claim 1 , wherein the mounting bracket is formed to be longer than the length of the battery module group in the one direction.

4. The vehicle power storage device according to claim 3 , wherein both end portions of the mounting bracket protrude in the one direction beyond the group of battery modules when the plurality of battery modules are connected together.

5. The vehicle electric power storage device according to claim 1 , wherein the mounting bracket is fixed to an upper surface of the beam-shaped member.

6. The battery module group is stacked in the vertical direction of the vehicle, 2. The vehicle power storage device according to claim 1, wherein the battery module group on the upper side of the vehicle and the battery module group on the lower side of the vehicle are connected via the mounting bracket.

7. 7. The vehicle power storage device according to claim 6, wherein a heat dissipation panel is interposed between the battery module group on the upper side of the vehicle and the battery module group on the lower side of the vehicle.

8. The vehicle power storage device according to any one of claims 1 to 7, a beam-like member extending in the vehicle width direction and installed between the frame members; and the mounting bracket extends in the vehicle width direction and is fixed to the beam-like member, the beam-shaped member protrudes in the vehicle width direction beyond the battery module group when the plurality of battery modules are connected by the mounting bracket. Structure for mounting a power storage device.

9. Rockers are provided on both sides of the vehicle width direction, extending in the vehicle front-rear direction, The electric storage device mounting structure according to claim 8 , wherein the beam-shaped member and the mounting bracket overlap with the rocker when viewed in the vehicle width direction.

10. An impact absorbing member is provided on the outer side of the rocker in the vehicle width direction, The power storage device mounting structure according to claim 9 , wherein the impact absorbing member overlaps the entire area of ​​the beam-shaped member and a lower portion of the mounting bracket when viewed in the vehicle width direction.

11. a longitudinal reinforcement positioned between the battery modules and extending in the vehicle front-rear direction; The electric storage device mounting structure according to claim 8 , wherein the mounting bracket is fixed to the beam-like member and the vertical reinforcement.

12. the battery module group is arranged in the vehicle front-rear direction with the beam-shaped member sandwiched therebetween, 9. The electric storage device mounting structure according to claim 8, wherein the battery module group on the vehicle front side and the battery module group on the vehicle rear side are fixed to the beam-shaped member via the mounting brackets, respectively.

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