Power storage device

Abstract

To provide a power storage device capable of suppressing an exhaust of a power storage module that discharges gas and smoke downward from being hindered by a foreign matter (debris).SOLUTION: A power storage device 100 includes a power storage module 10 including a lower surface 4a in which an exhaust hole 4b is formed, a lower case 21 including a bottom surface part 21a that covers the lower surface 4a of the power storage module 10 from below, and a cross member 30 (partition member) provided in the lower case 21 so as to partition a region in which the power storage module 10 is disposed in the lower case 21. A groove part 21h (recessed part) recessed downward is formed in the bottom surface part 21a. A smoke discharge passage 30a communicating with a groove part 21h is formed inside the cross member 30.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present disclosure relates to an electricity storage device. [Background technology]

[0002] International Publication No. 2020 / 026973 (Patent Document 1) discloses a battery pack housed in a pack case. The battery pack includes multiple stacked batteries. Patent Document 1 describes an example in which gas is released downward from a valve provided at the bottom of each battery. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2020 / 026973 Summary of the Invention [Problem to be solved by the invention]

[0004] As described above, if gas is released downward from the battery, it is possible that foreign matter (debris) may become lodged between the pack case (lower case) and the battery pack (energy storage module), preventing the gas and smoke from escaping from the battery pack.

[0005] The present disclosure has been made to solve the above-mentioned problems, and its purpose is to provide an energy storage device that can prevent foreign matter (debris) from obstructing the exhaust of an energy storage module that discharges gas and smoke downward. [Means for solving the problem]

[0006] According to one aspect of the present disclosure, there is provided an energy storage device including an energy storage module having a lower surface with an exhaust hole formed therein, a lower case including a bottom surface portion covering the lower surface of the energy storage module from below, and a partition member provided on the lower case so as to partition an area in the lower case where the energy storage module is disposed. The bottom surface portion has a recess formed therein that is recessed downward. A smoke exhaust path communicating with the recess is formed inside the partition member.

[0007] In the energy storage device according to one aspect of the present disclosure, as described above, a recess recessed downward is formed in the bottom surface of the lower case, and a smoke exhaust path communicating with the recess is formed inside the partition member. This allows gas and smoke discharged from an exhaust port provided on the underside of the energy storage module to be discharged into the recess communicating with the smoke exhaust path inside the partition member. As a result, the gas and smoke can be easily guided to the smoke exhaust path. This makes it possible to prevent foreign matter (debris) caused by the gas and smoke from accumulating below the energy storage module. As a result, it is possible to prevent foreign matter (debris) from interfering with the exhaust of the energy storage module, which discharges gas and smoke downward.

[0008] The partition member may have a lower end formed with an opening communicating with the smoke exhaust path, and may be disposed above the recess so that the opening faces the recess in the vertical direction. With this configuration, gas and smoke discharged from the power storage module into the recess can easily flow into the interior of the partition member (smoke exhaust path) through the opening.

[0009] The energy storage device may include a fixing member that fixes the energy storage module to the partition member. The energy storage module may be disposed such that its lower surface is spaced apart from the bottom surface of the lower case when fixed to the partition member by the fixing member. With this configuration, a space is formed between the energy storage module and the bottom surface of the lower case when fixed to the partition member by the fixing member, thereby widening the flow path of gas and smoke discharged downward from the energy storage module by the space. As a result, gas and smoke can be more efficiently exhausted. Note that fixing the energy storage module to the partition member by the fixing member also includes indirectly fixing the energy storage module to the partition member by the fixing member.

[0010] The energy storage modules may include a first energy storage module, a second energy storage module, and a third energy storage module arranged in an arrangement direction, with the second energy storage module being disposed on one side of the first energy storage module in the arrangement direction and the third energy storage module being disposed on the other side of the first energy storage module in the arrangement direction. The partitioning member may include a first partitioning member provided between the first energy storage module and the second energy storage module to extend in a direction intersecting the arrangement direction, and a second partitioning member provided between the first energy storage module and the third energy storage module to extend in the direction intersecting the arrangement direction. The recess may include a first groove formed to extend in the arrangement direction so as to connect the first partitioning member and the second partitioning member. With this configuration, the first groove can guide gas and smoke exhausted from the first energy storage module to each of the smoke exhaust path within the first partitioning member and the smoke exhaust path within the second partitioning member. As a result, gas and smoke can be exhausted more efficiently than when the first groove portion is connected to only one of the smoke exhaust path within the first partition member and the smoke exhaust path within the second partition member.

[0011] The recess may further include a second groove provided below the second power storage module and extending in the arrangement direction, and a third groove provided below the third power storage module and extending in the arrangement direction. The first groove may be separated from each of the second groove and the third groove. This configuration can prevent gas and smoke discharged from the first power storage module into the first groove from circulating through the second groove and the third groove. As a result, it is possible to prevent a thermal chain reaction from occurring between the power storage modules arranged in the arrangement direction. [Effects of the Invention]

[0012] According to the present disclosure, it is possible to prevent foreign matter (debris) from interfering with the exhaust of the power storage module, which discharges gas and smoke downward. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 2 is a perspective view showing an electricity storage device and a frame member according to one embodiment. [Figure 2] 1 is a plan view illustrating a configuration of an electricity storage device according to an embodiment. [Figure 3] FIG. 3 is a schematic cross-sectional view taken along line III-III in FIG. 2. [Figure 4] FIG. 4 is a schematic cross-sectional view taken along line IV-IV in FIG. 2. [Figure 5] FIG. 3 is a cross-sectional view taken along line VV in FIG. [Figure 6] FIG. 10 is a plan view showing the configuration of a power storage device according to a modified example of the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0014] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] The present disclosure will be described with reference to the accompanying drawings, in which the same or corresponding elements are designated by the same reference numerals.

[0015] An electricity storage device 100 according to an embodiment of the present disclosure will be described with reference to FIGS. 1 to 5. FIG. 1 is a perspective view showing the electricity storage device 100 according to this embodiment. In FIG. 1, the electricity storage device 100 is attached to a frame member 110 that is disposed at the bottom of a vehicle (not shown). Examples of vehicles that may incorporate the electricity storage device 100 include hybrid electric vehicles (HVs), plug-in hybrid electric vehicles (Plug-in Hybrid Electric Vehicles), and battery electric vehicles (Battery Electric Vehicles). Note that the use of the electricity storage device 100 is not limited to vehicle use.

[0016] In this specification, the X direction, Y direction, and Z direction are directions that are perpendicular to each other. For example, the X direction and Y direction are the front-to-rear direction and the width direction of the vehicle when the power storage device 100 is mounted on the vehicle. The X1 direction and X2 direction are the front and rear of the vehicle, respectively. The Y1 direction and Y2 direction are the left and right sides of the vehicle, respectively. The Z direction is the up-down (vertical) direction. The X direction and Y direction are examples of the "arrangement direction" and "intersecting direction" in the present disclosure, respectively.

[0017] As shown in FIG. 1, the frame member 110 has a pair of first frames 111, a pair of second frames 112, a first cross frame 113, and a second cross frame 114.

[0018] 1, the equipment unit 120 is disposed on the rear end (X2 side) of the power storage device 100. The equipment unit 120 is electrically connected to the power storage device 100, and includes a junction box, an electricity supply unit, an electronic control unit, etc. (none of which are shown). The position where the equipment unit 120 is disposed is not limited to this example.

[0019] FIG. 2 is a plan view of the energy storage device 100. The energy storage device 100 includes a plurality of energy storage modules 10, a case 20, a plurality (four in this embodiment) of cross members 30, a plurality (six in this embodiment) of cross members 40, a plurality (six in this embodiment) of connecting brackets 50, a plurality of bolts 60, and a plurality of bolts 70. The case 20 houses the plurality of energy storage modules 10. The cross members 30 are an example of a "compartment member" in the present disclosure. The bolts 60 and 70 are each an example of a "fixing member" in the present disclosure. In FIG. 2, a groove portion 21h, which will be described later, is indicated by a dashed line.

[0020] The plurality of energy storage modules 10 are arranged in a matrix (3x3) on the XY plane when viewed from the Z1 side. Specifically, three sets of three energy storage modules 10 arranged in the X direction are arranged in the Y direction.

[0021] The case 20 includes a lower case 21. The lower case 21 is provided to cover the plurality of power storage modules 10 from below.

[0022] The lower case 21 has a bottom surface portion 21a and a peripheral wall portion 21b. The bottom surface portion 21a is provided below the plurality of power storage modules 10. The bottom surface portion 21a is provided so as to cover the plurality of power storage modules 10 from below.

[0023] The peripheral wall portion 21b is provided so as to extend from the outer peripheral edge portion of the bottom surface portion 21a toward the Z1 side. The peripheral wall portion 21b is provided in an annular shape so as to surround the plurality of power storage modules 10.

[0024] The peripheral wall portion 21b is composed of a side wall 21c, a side wall 21d, a side wall 21e, and a side wall 21f. The side wall 21c is provided to extend in the Y direction on the X1 side of the multiple power storage modules 10. The side wall 21d is provided to extend in the Y direction on the X2 side of the multiple power storage modules 10. The side wall 21e is provided to extend in the X direction on the Y1 side of the multiple power storage modules 10. The side wall 21f is arranged to extend in the X direction on the Y2 side of the multiple power storage modules 10.

[0025] A relief valve 21g is provided on the side wall 21c. The relief valve 21g discharges gas and smoke discharged from the power storage module 10 into the case 20 to the outside of the case 20. The relief valve 21g opens when the pressure inside the case 20 reaches or exceeds a certain level.

[0026] The cross members 30 and the cross members 40 extend perpendicular to each other. The multiple cross members 30 and the multiple cross members 40 are provided to define an area in the lower case 21 where the energy storage modules 10 are to be arranged. Specifically, the multiple cross members 30 and the multiple cross members 40 define nine areas. An energy storage module 10 is arranged in each of the nine areas. Each of the multiple cross members 30 and the multiple cross members 40 is provided to the lower case 21 (for example, fixed by welding or the like). The cross members 30 and the cross members 40 may be made of iron, for example. The number and arrangement (layout) of the energy storage modules 10 are not limited to the above example.

[0027] The four cross members 30 are arranged in the X direction at intervals from one another. Each of the four cross members 30 extends in the Y direction along the three power storage modules 10 arranged in the Y direction.

[0028] Of the four cross members 30, the cross member 30 closest to the X1 side is provided between the side wall 21c and the energy storage module 10. Of the four cross members 30, the cross member 30 closest to the X2 side is provided between the side wall 21d and the energy storage module 10. Of the four cross members 30, the second cross member 30 from the X1 side is provided between the energy storage module 10 closest to the X1 side and the central energy storage module 10 among the three energy storage modules arranged in the X direction. Of the four cross members 30, the second cross member 30 from the X2 side is provided between the energy storage module 10 closest to the X2 side and the central energy storage module 10 among the three energy storage modules arranged in the X direction.

[0029] The cross member 30 arranged between the central energy storage module 10 and the energy storage module 10 on the X1 side among the three energy storage modules arranged in the X direction is an example of a "first partition member" in the present disclosure. The cross member 30 arranged between the central energy storage module 10 and the energy storage module 10 on the X2 side among the three energy storage modules 10 arranged in the X direction is an example of a "second partition member" in the present disclosure.

[0030] The six cross members 40 are provided to extend in the X direction between the power storage modules 10 adjacent to each other in the Y direction. Specifically, three sets of three power storage modules 10 arranged in the Y direction are provided inside the case 20. In each of the three sets, a cross member 40 is provided between the power storage modules 10 adjacent to each other in the Y direction.

[0031] Each of the multiple connecting brackets 50 connects three energy storage modules 10 arranged in the Y direction. Each of the multiple connecting brackets 50 extends in the Y direction along the three energy storage modules 10 arranged in the Y direction. The connecting brackets 50 are arranged on the X1 side and X2 side of each set (three sets) made up of three energy storage modules 10 arranged in the Y direction. The connecting brackets 50 may be made of aluminum, for example.

[0032] Each of the multiple energy storage modules 10 includes a fastening portion 11 that is fastened to the connecting bracket 50. The fastening portion 11 is provided to extend in the Y direction at an end on the X1 side and an end on the X2 side of each of the multiple energy storage modules 10. Bolts 60 fasten the end on the Y1 side and the end on the Y2 side of each fastening portion 11 to the connecting bracket 50.

[0033] Each connecting bracket 50 has a plurality of protrusions 51 that protrude from the energy storage module 10 toward the cross member 30 (X1 side or X2 side). Each of the plurality of protrusions 51 is provided above the cross member 30. Bolts 70 fasten the protrusions 51 and the cross member 30 at portions that overlap in the Z direction. Therefore, each energy storage module 10 is fixed to the cross member 30 via the connecting brackets 50.

[0034] Fig. 3 is a cross-sectional view taken along line III-III in Fig. 2. Case 20 includes an upper cover 22. By assembling upper cover 22 to lower case 21, a space is formed in which a plurality of power storage modules 10 are housed.

[0035] Each of the multiple energy storage modules 10 includes a lower module 1, an upper module 2, and a cooler 3. The lower module 1 is provided below the upper module 2. The cooler 3 is sandwiched between the lower module 1 and the upper module 2 in the Z direction. The lower module 1, cooler 3, and upper module 2 are stacked in this order from the bottom up.

[0036] The lower module 1 and the upper module 2 each include a cell case 4 and a cell case 5. Each of the cell case 4 and the cell case 5 houses a plurality of storage cells 6. The cell case 4 and the cell case 5 have the same configuration.

[0037] A plurality of grooves 21h recessed downward are formed in the bottom surface portion 21a of the lower case 21. The bottom surface portion 21a also includes a flat surface portion 21i. That is, each of the plurality of grooves 21h is formed to be recessed downward from the flat surface portion 21i. Each of the plurality of grooves 21h is formed to extend in the X direction. Two grooves 21h are provided below each of the three energy storage modules 10 arranged in the Y direction. Note that the positions of the grooves 21h in the Y direction are the same among the three energy storage modules 10 arranged in the X direction (see FIG. 2). Furthermore, the formation of the grooves 21h forms raised portions (beads) 21k on the outer surface 21j of the bottom surface portion 21a. This improves the rigidity of the bottom surface portion 21a. Note that the raised portions 21k do not necessarily have to be formed. The grooves 21h are an example of a "recess" in the present disclosure.

[0038] The cross member 40 has a hat shape in a cross section taken along the Y direction. Specifically, the cross member 40 has an upper end surface portion 41, a pair of side surface portions 42, and a pair of flange portions 43. The upper end surface portion 41 is formed to extend in the X direction. One and the other of the pair of side surface portions 42 are provided to extend downward from the Y1-side end and Y2-side end of the upper end surface portion 41, respectively. One of the pair of flange portions 43 on the Y1 side extends from the lower end of the side surface portion 42 to the Y1 side. One of the pair of flange portions 43 on the Y2 side extends from the lower end of the side surface portion 42 to the Y2 side.

[0039] Fig. 4 is a cross-sectional view taken along line IV-IV in Fig. 2. A plurality of storage cells 6 are arranged in the X direction inside each of the cell case 4 of the lower module 1 and the cell case 5 of the upper module 2. For simplicity, the connecting bracket 50 is not shown in Fig. 4.

[0040] The cell case 4 of the lower module 1 has a lower surface 4a. An exhaust hole 4b is formed in the lower surface 4a. The lower surface 4a is covered from below by the lower case 21 (bottom surface portion 21a). The cell case 5 of the upper module 2 has an upper surface 5a. An exhaust hole 5b is formed in the upper surface 5a. Note that the number of each of the exhaust hole 4b and the exhaust hole 5b in each energy storage module 10 may be one or more. The lower surface 4a is an example of the "lower surface of the energy storage module" of the present disclosure.

[0041] In a conventional energy storage device, when gas and smoke are released downward from the energy storage module, foreign matter (debris) may become lodged between the lower case and the energy storage module, preventing the gas and smoke from being exhausted from the energy storage module.

[0042] Therefore, in this embodiment, a smoke exhaust path 30a that communicates with the groove portion 21h is formed inside the cross member 30. As a result, the gas and smoke discharged from the exhaust hole 4b flows in the X direction along the groove portion 21h and flows into the smoke exhaust path 30a inside the cross member 30.

[0043] The gas and smoke that flow into the smoke exhaust path 30a flows in the Y direction along the cross member 30 and is discharged into the gap between the power storage module 10 and the peripheral wall portion 21b (FIG. 2). The gas and smoke that are discharged into the gap move along the inner surface of the peripheral wall portion 21b to the relief valve 21g (FIG. 2) and are discharged from the relief valve 21g to the outside of the case 20. An example of the flow path of the gas and smoke that moves along the smoke exhaust path 30a is shown by the dashed-dotted arrow in FIG. 2.

[0044] The cross member 30 has a hat shape in a cross section taken along the X direction. Specifically, the cross member 30 has an upper end surface portion 31, a pair of side surface portions 32, and a pair of flange portions 33. The upper end surface portion 31 is formed to extend in the Y direction. One and the other of the pair of side surface portions 32 are provided to extend downward from the X1-side end and X2-side end of the upper end surface portion 31, respectively. One of the pair of flange portions 33 on the X1 side is provided to extend from the lower end of the side surface portion 32 to the X1 side. One of the pair of flange portions 33 on the X2 side is provided to extend from the lower end of the side surface portion 32 to the X2 side. Each of the pair of flange portions 33 is provided at the lower end 34 of the cross member 30.

[0045] An opening 35 is formed in the lower end 34 of the cross member 30. The opening 35 is provided between the pair of flange portions 33. Therefore, the opening 35 is formed so as to extend in the Y direction along the pair of flange portions 33.

[0046] The cross member 30 is disposed above the groove 21h so that the opening 35 faces the groove 21h in the Z direction. Specifically, the opening 35 of the cross member 30 is disposed at a position that overlaps in the vertical direction with at least one of the end 21l (and its vicinity) on the X1 side and the end 21m (and its vicinity) on the X2 side of the groove 21h.

[0047] Specifically, of the three power storage modules 10 arranged in the X direction, the groove 21h below the central power storage module 10 has a cross member 30 provided at each of the end 21l and end 21m. Of the three power storage modules 10 arranged in the X direction, the groove 21h below the power storage module 10 on the X1 side has a cross member 30 provided at the end 21l. Of the three power storage modules 10 arranged in the X direction, the groove 21h below the power storage module 10 on the X2 side has a cross member 30 provided at the end 21m.

[0048] The central power storage module 10 of the three power storage modules 10 arranged in the X direction and the groove 21h below the central power storage module 10 are examples of the "first power storage module" and the "first groove" of the present disclosure. The power storage module 10 arranged on the X1 side of the central power storage module 10 and the groove 21h below the X1-side power storage module 10 are examples of the "second power storage module" and the "second groove" of the present disclosure. The power storage module 10 arranged on the X2 side of the central power storage module 10 and the groove 21h below the X2-side power storage module 10 are examples of the "third power storage module" and the "third groove" of the present disclosure.

[0049] The grooves 21h provided below each of the three power storage modules 10 arranged in the X direction are separated from one another. Specifically, the bottom surface 21a (flat surface 21i) provided between adjacent grooves 21h in the X direction is in contact (welded) with the flange 33 of the cross member 30. A seal 36 is formed at the contact portion. This prevents gas and smoke from moving between adjacent grooves 21h in the X direction. It is also possible to prevent gas and smoke from the grooves 21h from being discharged toward the side wall 21c or 21d.

[0050] 5 is a cross-sectional view taken along line VV in FIG. 2. The energy storage module 10 is (indirectly) fixed to the cross member 30 by bolts 60 and 70, and is disposed such that the lower surface 4a of the lower module 1 is spaced apart from the bottom surface 21a (flat surface 21i) of the lower case 21. For example, a distance D1 between the flat surface 21i and the lower surface 4a is greater than a thickness t of the plate material constituting the cross member 30. The distance D1 may be greater than a distance D2 between a side surface 32 of the cross member 30 on the energy storage module 10 side and the fastening portion 11a of the energy storage module 10. Note that the distance D2 may be greater than the thickness t.

[0051] The fastening portion 11 of the energy storage module 10 includes a fastening portion 11a and a fastening portion 11b. The fastening portion 11a is provided on the lower module 1. The fastening portion 11b is provided on the upper module 2. The fastening portion 11b is provided above the fastening portion 11a.

[0052] The fastening portion 11a has a through hole 11c formed therethrough in the Z direction. The fastening portion 11b has a through hole 11d formed therethrough in the Z direction. The through holes 11c and 11d overlap in the Z direction.

[0053] The connecting bracket 50 includes a non-protruding portion 52 that is provided continuously with the protruding portion 51. The non-protruding portion 52 is sandwiched in the vertical direction between the fastening portion 11a and the fastening portion 11b. The non-protruding portion 52 is provided so as to extend in the Y direction. A through hole 52a that extends in the Z direction is formed in the non-protruding portion 52. The through hole 52a is threaded.

[0054] The bolt 60 includes a bolt 61 and a bolt 62. The bolt 61 has a head portion 61a and a shank portion 61b extending from the head portion 61a toward the Z1 side. The bolt 62 has a head portion 62a and a shank portion 62b extending from the head portion 62a toward the Z2 side. The shank portion 61b of the bolt 61 passes through a through hole 11c of the fastening portion 11a and is inserted into the through hole 52a from below. The shank portion 62b of the bolt 62 passes through a through hole 11d of the fastening portion 11b and is inserted into the through hole 52a from above. In this way, the energy storage module 10 is fastened (fixed) to the connecting bracket 50.

[0055] The head 61a of the bolt 61 is fixed to the lower surface 11e of the fastening portion 11a. The head 62a of the bolt 62 is fixed to the upper surface 11f of the fastening portion 11b. The lower surface 11e of the fastening portion 11a is located higher than the lower surface 4a of the lower module 1. The upper surface 11f of the fastening portion 11b is located lower than the upper surface 5a of the upper module 2.

[0056] The protrusion 51a has a through hole 51a formed therein that extends in the Z direction. The upper end surface 31 of the cross member 30 has a through hole 31a formed therein that penetrates the upper end surface 31 in the Z direction. The bolt 70 has a head 71 and a shank 72 that extends from the head 71 toward the Z2 side. The shank 72 penetrates the through hole 51a and the through hole 31a. The head 71 is fixed to the upper surface 50a of the connecting bracket 50 (protrusion 51). The shank 72 is fixed by a nut 51b. The nut 51b is fixed to the lower surface 31b of the upper end surface 31 of the cross member 30. The nut 51b is an example of a "fixing member" in the present disclosure.

[0057] In the energy storage device 100 described above, a smoke exhaust path 30a is formed inside the cross member 30. The smoke exhaust path 30a communicates with a downwardly recessed groove 21h formed in the bottom surface 21a of the lower case 21. This allows gas and smoke exhausted downward from the energy storage module 10 toward the lower case 21 to be guided by the groove 21h to the smoke exhaust path 30a in the cross member 30. As a result, the gas and smoke can easily flow into the smoke exhaust path 30a in the cross member 30, allowing the gas and smoke to be efficiently exhausted. This prevents foreign matter (debris) from accumulating on the bottom surface 21a of the lower case 21, thereby preventing the exhaust from being obstructed by the foreign matter. This prevents damage to the case 20 or the energy storage module 10 due to an increase in internal pressure in the space between the energy storage module 10 and the lower case 21.

[0058] In the above embodiment, an example was shown in which the grooves 21h extend in the X direction, but the present disclosure is not limited to this, and the grooves may extend in the Y direction.

[0059] For example, the energy storage device 200 shown in FIG. 6 has grooves 121h extending in the Y direction. Two grooves 121h are formed below each energy storage module 10. The grooves 121h provided below energy storage modules 10 adjacent to each other in the Y direction are formed at different positions in the X direction. In this case, the grooves 121h are an example of a "recess" in the present disclosure, and the Y direction is an example of an "arrangement direction" in the present disclosure. Furthermore, among the components shown in FIG. 6, components that are assigned the same reference numerals as those in the above embodiment have the same configuration as those in the above embodiment, and therefore will not be described again.

[0060] The central power storage module 10 of the three power storage modules 10 arranged in the Y direction and the groove 121h below the central power storage module 10 are examples of the "first power storage module" and the "first groove" of the present disclosure. The power storage module 10 arranged on the Y1 side of the central power storage module 10 and the groove 121h below the Y1-side power storage module 10 are examples of the "second power storage module" and the "second groove" of the present disclosure. The power storage module 10 arranged on the Y2 side of the central power storage module 10 and the groove 121h below the Y2-side power storage module 10 are examples of the "third power storage module" and the "third groove" of the present disclosure.

[0061] The power storage device 200 includes a plurality of (nine in FIG. 6 ) cross members 130, a cross member 131, and a plurality of (three in FIG. 6 ) cross members 140. Each of the cross members 130 is provided between the central power storage module 10 and the power storage module 10 on the X1 side among the three power storage modules 10 arranged in the X direction, between the central power storage module 10 and the power storage module 10 on the X2 side, and between the power storage module 10 on the X1 side and the side wall 21c. The cross member 131 is provided between the power storage module 10 on the X2 side and the side wall 21d. Each of the multiple cross members 130 extends in the Y direction along the side surface of each power storage module 10 in the X direction. The cross member 131 extends in the Y direction so as to straddle the three power storage modules 10 arranged in the Y direction. The cross member 140 is an example of a "compartment member" in the present disclosure.

[0062] Each of the multiple cross members 140 extends in the X direction so as to straddle three energy storage modules 10 arranged in the X direction. The cross members 140 are arranged between pairs of three energy storage modules 10 arranged in the X direction. In other words, the cross members 140 are arranged so as to cross (separate) the space between adjacent cross members 130 in the Y direction. The shape (hat-shaped cross section) of each of the cross members 130 and 140 may be the same as the cross members 30 and 40 of the above embodiment.

[0063] Furthermore, the cross member 140 disposed between the central energy storage module 10 and the energy storage module 10 on the Y1 side among the three energy storage modules arranged in the Y direction is an example of a "first partition member" in the present disclosure. The cross member 140 disposed between the central energy storage module 10 and the energy storage module 10 on the Y2 side among the three energy storage modules arranged in the Y direction is an example of a "second partition member" in the present disclosure.

[0064] Each groove 121h extends to an opening (not shown) provided at a lower end of the cross member 140. Specifically, in the central energy storage module 10 of the three energy storage modules 10 arranged in the Y direction, the groove 121h extends to the openings of the cross member 140 provided on the Y1 side and the Y2 side of the energy storage module 10. In the energy storage module 10 on the Y1 side of the three energy storage modules 10 arranged in the Y direction, the groove 121h extends to the opening of the cross member 140 provided on the Y2 side of the energy storage module 10. In the energy storage module 10 on the Y2 side of the three energy storage modules 10 arranged in the Y direction, the groove 121h extends to the opening of the cross member 140 provided on the Y1 side of the energy storage module 10.

[0065] As a result, the gas and smoke discharged from the power storage module 10 into the groove portion 121h flows through the opening of the cross member 140 into the smoke exhaust path 140a inside the cross member 140. The gas and smoke that flowed into the smoke exhaust path 140a inside the cross member 140 travels through the smoke exhaust path 140a of the cross member 140 to the relief valve 21g as shown by the dashed-dotted arrow in Figure 6, and is discharged from the relief valve 21g.

[0066] Furthermore, some of the gas and smoke that flows into the smoke exhaust path 140a inside the cross member 140 flows toward the cross member 131 (X2 side), as shown by the two-dot chain arrow in Figure 6. The X2 side end of each cross member 140 is in contact with (butts against) the cross member 131. This causes the X2 side end of each cross member 140 to be blocked by the cross member 131. As a result, it is possible to prevent foreign matter (debris) from accumulating around the cross member 131 due to the gas and smoke that flowed toward the cross member 131 leaking from the cross member 140.

[0067] In the above embodiment, an example has been shown in which the lower surface 4a of the energy storage module 10 is spaced apart from the bottom surface portion 21a (flat surface portion 21i) when fixed to the cross member 30, but the present disclosure is not limited to this. The lower surface 4a of the energy storage module 10 may be in contact with the flat surface portion 21i.

[0068] In the above embodiment, an example has been shown in which the groove portions 21h formed below each of the three energy storage modules 10 arranged in the X direction are positioned at the same position in the Y direction, but the present disclosure is not limited to this. The positions in the Y direction of the groove portions 21h may be different between the three energy storage modules 10 (at least between the energy storage modules 10 adjacent in the X direction).

[0069] In the above embodiment, an example has been described in which the grooves 21h below the power storage modules 10 adjacent to each other in the X direction are not connected to each other, but the present disclosure is not limited to this. The grooves 21h may extend in the X direction so as to straddle three power storage modules 10 arranged in the X direction.

[0070] In the above embodiment, an example has been shown in which the power storage module 10 includes the upper module 2 and the lower module 1, but the present disclosure is not limited to this. The power storage module does not have to be divided into an upper module and a lower module.

[0071] In the above embodiment, an example has been shown in which the groove 21h is formed below the energy storage module 10, but the present disclosure is not limited to this. A recess that does not have an elongated shape like a groove may be formed. In this case, a plurality of recesses may be formed below each energy storage module 10.

[0072] In the above embodiment, an example has been described in which the energy storage module 10 is indirectly fixed to the cross member 30 via the connecting bracket 50, but the present disclosure is not limited to this. The energy storage module 10 may also be directly fixed (fastened) to the cross member 30.

[0073] The configurations of the above-described embodiment and the above-described modifications may be combined with each other.

[0074] It should be noted that the embodiments disclosed herein are illustrative in all respects and should not be considered limiting. The scope of the present disclosure is defined by the claims rather than the description of the above embodiments, and further includes all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0075] 4a lower surface, 4b exhaust hole, 10 energy storage module (first energy storage module) (second energy storage module) (third energy storage module), 21 lower case, 21a bottom surface portion, 21h, 121h groove portion (recess) (first groove portion) (second groove portion) (third groove portion), 30, 140 cross member (compartment member) (first partition member) (second partition member), 30a, 140a smoke exhaust path, 34 lower end portion, 35 opening, 51b nut (fastening member), 60, 70 bolt (fastening member), 100, 200 energy storage device.

Claims

1. an electricity storage module including a lower surface having an exhaust hole formed therein; a lower case including a bottom surface portion that covers the lower surface of the power storage module from below; a partition member provided in the lower case so as to partition an area in which the power storage module is to be disposed within the lower case, A recess recessed downward is formed in the bottom surface portion, The electricity storage device, wherein a smoke exhaust path communicating with the recess is formed inside the partition member.

2. The partition member is a lower end portion formed with an opening communicating with the smoke exhaust path; The power storage device according to claim 1 , wherein the opening is disposed above the recess so as to face the recess in the up-down direction.

3. a fixing member that fixes the power storage module to the partition member; The power storage device according to claim 1 or 2, wherein the power storage module is provided such that the lower surface thereof is spaced apart from the bottom surface of the lower case when the power storage module is fixed to the partition member by the fixing member.

4. the power storage modules include a first power storage module, a second power storage module, and a third power storage module arranged in an arrangement direction; the second power storage module is disposed on one side of the first power storage module in the arrangement direction, the third power storage module is disposed on the other side of the first power storage module in the arrangement direction, The partition member is a first partition member provided between the first power storage module and the second power storage module so as to extend in an intersecting direction intersecting the arrangement direction; a second partition member provided between the first power storage module and the third power storage module so as to extend in the intersecting direction, The power storage device according to claim 1 or 2, wherein the recess includes a first groove formed to extend in the arrangement direction so as to connect the first partition member and the second partition member.

5. The recessed portion is a second groove portion provided below the second power storage module and extending in the arrangement direction; a third groove portion provided below the third power storage module and extending in the arrangement direction, The power storage device according to claim 4 , wherein the first groove is separated from each of the second groove and the third groove.

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