Power storage device and vehicle mounted structure of same

Abstract

The invention provides an electricity storage device and a vehicle mounting structure of the electricity storage device, which are capable of suppressing the generation of condensation in a case even when the case is shared. A power storage device according to one embodiment of the present disclosure is provided with: a battery module having a plurality of battery cells; a power storage device includes a plurality of battery modules, and a case that accommodates the battery modules, the power storage device including: a reinforcing member disposed between the battery modules; and a gap filling member disposed between the case and the battery module. The reinforcing member has a protruding portion that protrudes from an end portion of the battery module toward the outside of the electricity storage device. The gap filling member overlaps the protruding portion of the reinforcing member.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to an electrical storage device and a vehicle mounting structure of the electrical storage device. BACKGROUND

[0002] A general electrical storage device is configured such that a battery module in which battery cells are stacked is housed in a case in a state in which the battery module is arranged in a direction orthogonal to the stacking direction of the battery cells, as disclosed in Patent Literature 1, for example.

[0003] Patent Literature 1: Japanese Patent Application Publication No. 2022-128961 SUMMARY

[0004] For example, when a remaining space is formed inside the case when the number and the kind of the mounted battery cells are changed while using a common case, or the like, dew condensation can occur inside the case due to moisture contained in air of the remaining space.

[0005] The present disclosure is achieved in view of such a point, and realizes an electrical storage device and a vehicle mounting structure of the electrical storage device in which dew condensation inside a case can be suppressed even when the case is commonized.

[0006] An electrical storage device of one aspect of the present disclosure includes:

[0007] a battery module having a plurality of battery cells stacked in a first direction; and

[0008] a case housing the battery module,

[0009] The electrical storage device includes:

[0010] a reinforcing member disposed between the battery modules arranged in a second direction orthogonal to the first direction and the up-down direction, extending in the first direction; and

[0011] a gap filling member disposed between the case and the battery modules in the first direction,

[0012] The reinforcing member has a protruding portion protruding from an end portion of the battery module toward an outside of the electrical storage device in the first direction when viewed from the second direction,

[0013] The gap filling member overlaps the protruding portion of the reinforcing member when viewed from the second direction.

[0014] In the above-described electrical storage device, preferably, the gap filling member includes a first member,

[0015] The first member has:

[0016] a first portion in contact with an upper case of the cases arranged above the battery module;

[0017] a second portion in contact with a lower case of the cases arranged below the battery module; and

[0018] a third portion connecting the first portion and the second portion,

[0019] the first portion has a larger area than the third portion when viewed in the up-down direction.

[0020] In the above-described power storage device, it is preferable that the gap filling member include a first member,

[0021] the first member has:

[0022] a first portion in contact with an upper case of the cases arranged above the battery module;

[0023] a second portion in contact with a lower case of the cases arranged below the battery module;

[0024] a third portion connecting the first portion and the second portion; and

[0025] a fourth portion protruding from the first portion toward the second direction,

[0026] the fourth portion is supported by a protruding portion of the reinforcing member.

[0027] In the above-described power storage device, it is preferable that the second portion have a larger area than the third portion when viewed in the up-down direction.

[0028] In the above-described power storage device, it is preferable that the gap filling member include a second member,

[0029] the second member is arranged between the third portions of the first member that are arranged separately in the second direction, and has a smaller density than the first member.

[0030] A vehicle mounting structure of the above-described power storage device,

[0031] the upper case of the cases arranged above the battery module constitutes a floor surface of a passenger compartment of the vehicle.

[0032] In the above-described vehicle mounting structure of the power storage device, it is preferable that the vehicle include a pair of seat cross members extending in a width direction,

[0033] The gap filling member is disposed between the pair of seat cross members when viewed from above.

[0034] In the vehicle-mounted configuration of the electrical storage device described above, it is preferable that the gap filling member overlap at least a portion of the seat cross member of one of the pair of seat cross members when viewed from above.

[0035] According to the present disclosure, it is possible to achieve an electrical storage device and a vehicle-mounted configuration of the electrical storage device in which generation of condensation inside a case is suppressed even when the case is commonized.

[0036] The above and other objects, features and advantages of the present disclosure will be more fully understood from the following detailed description and accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 is a view showing a state in which the electrical storage device of the embodiment is mounted on a vehicle.

[0038] Figure 2 is an exploded view showing the electrical storage device of the embodiment in a simplified manner.

[0039] Figure 3 is a view of the configuration of a battery module and a gap filling member inside the electrical storage device of the embodiment, as viewed from the Z-axis + side.

[0040] Figure 4 is an XZ cross-sectional view of the electrical storage device of the embodiment.

[0041] Figure 5 is a YZ cross-sectional view at the V-V position of Figure 4

[0042] Figure 6 is a YZ cross-sectional view at the VI-VI position of Figure 4

[0043] Figure 7 is a view showing a state in which the gap filling member in the electrical storage device of the embodiment is supported to a reinforcing member.

[0044] Figure 8 is a perspective view showing the electrical storage device and the frame of the embodiment. DETAILED DESCRIPTION

[0045] Hereinafter, a specific embodiment to which the present disclosure is applied will be described in detail with reference to the drawings. However, the present disclosure is not limited to the following embodiment. In addition, the following description and drawings are appropriately simplified in order to make the description clear. Furthermore, in the following description, a three-dimensional (XYZ) coordinate system is used for explanation in order to make the description clear.

[0046] ​​First, the configuration of the power storage device 1 of the present embodiment will be described. Figure 1 is a view showing a state in which the power storage device of the present embodiment is mounted on a vehicle. The power storage device 1 is, for example, as shown in Figure 1 , suitable as a power storage device mounted on a vehicle 100.

[0047] Here, the X-axis + side is the front side of the vehicle 100, and the X-axis - side is the rear side of the vehicle 100. The Y-axis + side is the left side of the vehicle 100, and the Y-axis - side is the right side of the vehicle 100. The Z-axis + side is the upper side of the vehicle 100, and the Z-axis - side is the lower side of the vehicle 100. That is, it is assumed that the vehicle 100 is disposed on a horizontal plane.

[0048] Figure 2 is an exploded view showing the power storage device of the present embodiment. Figure 3 is a view of the configuration of the battery module and the gap filling member inside the power storage device of the present embodiment, as viewed from the Z-axis + side. Figure 4 is an XZ cross-sectional view of the power storage device of the present embodiment.

[0049] Figure 5 is a YZ cross-sectional view at the V-V position of Figure 4 . Figure 6 is a YZ cross-sectional view at the VI-VI position of Figure 4 . Figure 7 is a view showing a state in which the gap filling member in the power storage device of the present embodiment is supported by the reinforcing member.

[0050] As shown in Figures 2 to 7 , the power storage device 1 is provided with a battery module 2, a package case 3, a reinforcing member 4, and a gap filling member 5. The battery module 2 is provided with a plurality of battery cells 10. The battery cell 10 is, for example, formed by housing an electrode body inside a battery case 11 as shown in Figure 5 .

[0051] For example, as shown in Figure 5 , a first electrode terminal 12 of one of the positive electrode terminal and the negative electrode terminal is provided at the end portion of the Y-axis + side of the battery case 11, and a second electrode terminal 13 of the other of the positive electrode terminal and the negative electrode terminal is provided at the end portion of the Y-axis - side of the battery case 11.

[0052] Such battery cells 10 are stacked in the X-axis direction (first direction) in a manner in which the positive electrode terminal and the negative electrode terminal are alternately disposed at the Y-axis + side and the Y-axis - side of the battery module 2, respectively.

[0053] Furthermore, as shown in Figure 5As shown, on the Y-axis positive side of the battery module 2, adjacent first electrode terminals 12 in the X-axis direction are electrically connected by a first bus bar 14, and on the Y-axis negative side of the battery module 2, adjacent second electrode terminals 13 in the X-axis direction are electrically connected by a second bus bar 15. Thus, the battery cells 10 constituting the battery module 2 are electrically connected in series.

[0054] like Figures 2 to 7 As shown, the package case 3 houses the battery module 2. The package case 3 includes an upper case 21 and a lower case 22. The upper case 21 includes, for example, a housing portion 21a that bulges toward the positive side of the Z axis and has an internal space capable of housing the battery module 2, and a flange portion 21b that protrudes outward from the periphery of the housing portion 21a.

[0055] The lower housing 22 is, for example, Figures 2 to 7 As shown, it includes a housing portion 22 a recessed toward the Z-axis side and having an internal space capable of housing the battery module 2 , and a flange portion 22 b protruding outward from the periphery of the housing portion 22 a .

[0056] In a state where the battery modules 2 arranged at predetermined intervals in the Y-axis direction (second direction) are accommodated inside the accommodation portion 21a of the upper shell 21 and the accommodation portion 22a of the lower shell 22, the flange portion 21b of the upper shell 21 and the flange portion 22b of the lower shell 22 are joined by an adhesive component.

[0057] At this time, if Figure 2 and Figure 3 As shown, inside the package case 3, on the X-axis positive side or the X-axis negative side relative to the battery module 2, there is a residual space between the battery module 2 and the package case 3. In other words, the battery module 2 is not arranged so as to fill substantially the entire area inside the package case 3 in the X-axis direction.

[0058] Here, the battery module 2 is preferably arranged on the side where the junction box and other devices are arranged inside the housing 3. For example, when the junction box and other devices are arranged on the X-axis side of the power storage device 1, the battery module 2 is arranged on the side where the junction box and other devices are arranged. Figure 2 and Figure 3 It is preferably arranged on the X-axis-side portion inside the casing 3 as shown.

[0059] Therefore, in this embodiment, if Figure 2 and Figure 3 As shown, the battery module 2 is arranged on the X-axis - side portion of the power storage device 1. This shortens the wiring extending from the junction box and other equipment to each battery cell 10, simplifying the wiring layout.

[0060] The reinforcing member 4 is a rigid member that receives a load in the X-axis direction when the load is input to the power storage device 1. Figures 5 to 7As shown, the reinforcing member 4 is arranged between the battery modules 2 adjacent in the Y-axis direction in a space on the Z-axis side relative to the first bus bar 14 and the second bus bar 15 facing each other in the Y-axis direction, and extends in the X-axis direction.

[0061] The reinforcing member 4 is, for example, Figure 5 and Figure 6 As shown, the reinforcing member 4 has a substantially hat-like shape when viewed from the X-axis direction, and the Z-axis-side end portion thereof is fixed to the Z-axis-side surface of the accommodating portion 22 a of the lower case 22 .

[0062] At this time, the Z-axis side portion of the reinforcing member 4 is as follows, for example Figure 5 and Figure 6 As shown, it is preferably housed in a recess 22c formed in the housing portion 22a of the lower case 22. However, the shape of the reinforcing member 4 is not limited, as long as it is a member elongated in the X-axis direction.

[0063] For example, it is preferable that the end of the reinforcing member 4 on the + side of the X axis reaches near the end of the accommodating portion 22a on the + side of the X axis, and the end of the reinforcing member 4 on the - side of the X axis reaches near the end of the accommodating portion 22a on the - side of the X axis.

[0064] Therefore, when viewed from the Y-axis direction, the X-axis-side end of the reinforcing member 4 is arranged near the X-axis-side end of the battery module 2, and the X-axis-+ side portion of the reinforcing member 4 protrudes from the X-axis-+ side end of the battery module 2 toward the X-axis-+ side. Figure 7 As shown, the reinforcing member 4 has a protruding portion 4 a that protrudes toward the positive side of the X axis relative to the battery module 2 .

[0065] Here, when viewed in the Z-axis direction, it is preferable that the reinforcing member 4 overlaps at least a portion of the first bus bar 14 and the second bus bar 15 that are opposed in the Y-axis direction. This effectively utilizes the space on the Z-axis side of the first bus bar 14 and the second bus bar 15 that are opposed in the Y-axis direction, thereby contributing to the miniaturization of the power storage device 1.

[0066] The gap filling member 5 fills the remaining space between the battery module 2 and the package case 3 inside the package case 3. The gap filling member 5 is, for example, Figure 6 and Figure 7 As shown, it is a block member extending in the X-axis direction and includes a first member 31 and a second member 32 .

[0067] The first member 31 is, for example, Figure 4 and Figure 6 As shown, it is a frame material of the gap filling member 5. The first member 31 includes a first portion 31a, a second portion 31b, a third portion 31c, and a fourth portion 31d.

[0068] As Figure 4 and Figure 6 shown, the first portion 31a is disposed at the end of the first member 31 on the Z-axis + side, and constitutes a beam material on the Z-axis + side of the first member 31. The first portion 31a is, for example, a flat plate of a rectangular shape that is substantially parallel to the XY plane, and can be constituted by a metal plate, an aluminum plate, or a resin plate having rigidity, or the like.

[0069] The length of the first portion 31a in the X-axis direction is, for example, as shown in Figure 4 , a desired length for filling a remaining space between the battery module 2 and the case 3 that fills the inside of the case 3. The length of the first portion 31a in the Y-axis direction is, for example, as shown in Figure 6 , substantially equal to the length of the battery cell 10 in the Y-axis direction.

[0070] As Figure 4 and Figure 6 shown, the second portion 31b is disposed at the end of the first member 31 on the Z-axis - side, and constitutes a beam material on the Z-axis - side of the first member 31. The second portion 31b is substantially equal to the first portion 31a in constitution, and overlaps the first portion 31a when viewed from the Z-axis direction in a state disposed on the Z-axis - side with respect to the first portion 31a.

[0071] As Figure 6 shown, the third portions 31c are disposed at intervals in the Y-axis direction in the first member 31, and constitute column materials of the first member 31. The third portions 31c are, for example, plate bodies that are substantially parallel to the XZ plane, and can be constituted by a corrugated metal plate, an aluminum plate or an aluminum cast plate, an aluminum extruded plate, or a resin plate having rigidity, or the like.

[0072] The length of the third portion 31c in the X-axis direction is, for example, as shown in Figure 7 , substantially equal to the length of the first portion 31a in the X-axis direction. Also, the length of the third portion 31c in the Y-axis direction is, for example, as shown in Figure 6 , shorter than the length of the first portion 31a in the Y-axis direction.

[0073] As Figure 6 shown, the third portions 31c connect the first portion 31a and the second portion 31b. The third portions 31c, for example, connect the end of the first portion 31a on the Y-axis + side and the end of the second portion 31b on the Y-axis + side, and connect the end of the first portion 31a on the Y-axis - side and the end of the second portion 31b on the Y-axis - side.

[0074] Thus, a space surrounded by the first portion 31a, the second portion 31b, and the third portions 31c is formed. At this time, the areas of the first portion 31a and the second portion 31b are larger than the total area of all of the third portions 31c when viewed from the Z-axis direction.

[0075] Further, as shown in Figure 6 , the 3rd portion 31c further connects the 1st portion 31a and the 2nd portion 31b between the 3rd portion 31c on the Y-axis + side and the 3rd portion 31c on the Y-axis - side as appropriate.

[0076] As shown in Figure 6 and Figure 7 , the 4th portion 31d protrudes from the 1st portion 31a in the Y-axis direction, and is a shoulder material for supporting the 1st member 31 to the reinforcing member 4. The 4th portion 31d is, for example, a substantially L-shaped shape when viewed from the X-axis direction, and has an upright portion 31e and a horizontal portion 31f protruding in the Y-axis direction from an end portion of the upright portion 31e on the Z-axis - side.

[0077] The length of the 4th portion 31d in the X-axis direction is, for example, shorter than the length of the 1st member 31 in the X-axis direction. Also, the length of the 4th portion 31d in the Y-axis direction is, for example, half or less of the interval of the battery cases 11 of the battery modules 2 facing each other in the Y-axis direction.

[0078] The upright portion 31e of the 4th portion 31d is, for example, connected to at least one of "the end portion of the 1st portion 31a on the Y-axis + side and the end portion of the 3rd portion 31c on the Y-axis + side on the Y-axis + side" and "the end portion of the 1st portion 31a on the Y-axis - side and the end portion of the 3rd portion 31c on the Y-axis - side on the Y-axis - side" as shown in Figure 6 . At this time, as shown in Figure 7 , the 4th portion 31d is arranged at an interval in the X-axis direction.

[0079] Thus, as shown in Figure 6 , the 4th portion 31d is provided as at least one of "protruding from the 1st portion 31a and the 3rd portion 31c on the Y-axis + side to the Y-axis + side" and "protruding from the 1st portion 31a and the 3rd portion 31c on the Y-axis - side to the Y-axis - side".

[0080] In detail, the gap filling member 5 arranged in the remaining space on the X-axis + side with respect to the battery module 2 arranged on the Y-axis + side among the battery modules 2 arranged in the Y-axis direction is preferably the 4th portion 31d protruding from the 1st member 31 and the 3rd portion 31c on the Y-axis - side to the Y-axis - side.

[0081] Also, the gap filling member 5 arranged in the remaining space on the X-axis + side with respect to the battery module 2 arranged on the Y-axis - side among the battery modules 2 arranged in the Y-axis direction is preferably the 4th portion 31d protruding from the 1st member 31 and the 3rd portion 31c on the Y-axis + side to the Y-axis + side.

[0082] Further, the gap filling member 5, which is disposed in the remaining space on the X-axis + side with respect to the battery module 2 disposed on the Y-axis + side among the battery modules 2 arranged in the Y-axis direction and the battery module 2 disposed on the Y-axis - side, is preferably configured such that the fourth portion 31d protrudes from the first member 31 and the third portion 31c on the Y-axis + side toward the Y-axis + side and from the first member 31 and the third portion 31c on the Y-axis - side toward the Y-axis - side.

[0083] In these first members 31, as shown in Figure 6 the height from the end on the Z-axis - side of the second portion 31b to the end on the Z-axis - side of the horizontal portion 31f of the fourth portion 31d is preferably substantially equal to the height in the Z-axis direction of the reinforcing member 4.

[0084] The second member 32 is, for example, a member such as foamed polyurethane having a smaller density than the first member 31. As shown in Figure 4 and Figure 6 the second member 32 is disposed in the space surrounded by the first portion 31a, the second portion 31b, and the third portion 31c.

[0085] At this time, in order to reduce the remaining space inside the case 3, the second member 32 is preferably disposed so as to fill the entire space surrounded by the first portion 31a, the second portion 31b, and the third portion 31c.

[0086] As shown in Figure 7 such a gap filling member 5 is disposed on the X-axis + side with respect to the battery module 2 so as to overlap the protruding portion 4a of the reinforcing member 4 when viewed in the Y-axis direction, in a manner so as to fill the remaining space between the battery module 2 and the case 3 inside the case 3. Further, the gap filling member 5 is disposed so as to substantially overlap the battery module 2 when viewed in the X-axis direction.

[0087] At this time, as shown in Figure 4 and Figure 6 the end on the Z-axis + side of the first portion 31a of the first member 31 of the gap filling member 5 is in contact with the face on the Z-axis - side of the accommodation portion 21a of the upper case 21, and the end on the Z-axis - side of the second portion 31b of the first member 31 is in contact with the face on the Z-axis + side of the accommodation portion 22a of the lower case 22.

[0088] Thus, a path through which a load input to the upper case 21 is released to the lower case 22 via the first portion 31a, the third portion 31c, and the second portion 31b of the first member 31 can be formed.

[0089] Further, a path that releases a load input to the lower case 22 to the upper case 21 via the second portion 31b, the third portion 31c, and the first portion 31a of the first member 31 can be formed.

[0090] Further, in a state where the gap filling member 5 is supported to the accommodation portion 22a of the lower case 22, as shown in Figs. 1 and 2, the horizontal portion 31f of the fourth portion 31d of the first member 31 of the gap filling member 5 contacts the end portion of the protruding portion 4a of the reinforcing member 4 on the Z-axis + side. Figure 6 and Figure 7 Further, in a state where the gap filling member 5 is supported to the accommodation portion 22a of the lower case 22, as shown in Figs. 1 and 2, the horizontal portion 31f of the fourth portion 31d of the first member 31 of the gap filling member 5 contacts the end portion of the protruding portion 4a of the reinforcing member 4 on the Z-axis + side.

[0091] Further, in a state where the gap filling member 5 is supported to the accommodation portion 22a of the lower case 22, as shown in Figs. 1 and 2, the horizontal portion 31f of the fourth portion 31d of the first member 31 of the gap filling member 5 contacts the end portion of the protruding portion 4a of the reinforcing member 4 on the Z-axis + side.

[0092] Thus, in the power storage device 1 of the present embodiment, the remaining space between the battery module 2 inside the package case 3 and the package case 3 is filled with the gap filling member 5. Therefore, it is possible to reduce the remaining space inside the power storage device 1, and it is possible to suppress generation of condensation inside the power storage device 1.

[0093] Further, in the power storage device 1 of the present embodiment, since the gap filling member 5 is disposed so as to overlap the protruding portion 4a of the reinforcing member 4 when viewed from the Y-axis direction, it is possible to improve the rigidity of the power storage device 1 in the X-axis direction while suppressing generation of condensation inside the power storage device 1.

[0094] Further, in the power storage device 1 of the present embodiment, in a case where the end portion of the first portion 31a of the first member 31 of the gap filling member 5 on the Z-axis + side contacts the surface of the accommodation portion 21a of the upper case 21 on the Z-axis - side, and the end portion of the second portion 31b of the first member 31 on the Z-axis - side contacts the surface of the accommodation portion 22a of the lower case 22 on the Z-axis + side, it is possible to release a load input to the power storage device 1 from the Z-axis + side from the upper case 21 to the lower case 22 favorably, and it is possible to release a load input to the power storage device 1 from the Z-axis - side from the lower case 22 to the upper case 21 favorably.

[0095] Further, in the power storage device 1 of the present embodiment, in a case where the area of the first portion 31a of the first member 31 of the gap filling member 5 is larger than the total area of all of the third portions 31c, it is possible to obtain the contact area of the first portion 31a of the first member 31 with the upper case 21, and it is possible to release a load input to the power storage device 1 from the Z-axis + side from the upper case 21 to the gap filling member 5 favorably.

[0096] Likewise, in the power storage device 1 of the present embodiment, in a case where the area of the second portion 31b of the first member 31 of the gap filling member 5 is larger than the total area of all of the third portions 31c, the contact area of the second portion 31b of the first member 31 with the lower case 22 can be obtained, and the load inputted to the power storage device 1 from the Z-axis - side can be favorably released from the lower case 22 to the gap filling member 5.

[0097] Further, in the power storage device 1 of the present embodiment, in a case where the gap filling member 5 is supported to the reinforcing member 4 via the fourth portion 31d of the first member 31, the load inputted to the power storage device 1 from the Z-axis + side can also be favorably released to the reinforcing member 4.

[0098] Further, in the power storage device 1 of the present embodiment, in a case where the first member 31 of the gap filling member 5 constitutes the skeletal material of the gap filling member 5 and the space formed by the first member 31 is filled with the second member 32 having a smaller density than the first member 31, the remaining space of the power storage device 1 can be reduced. Also, the gap filling member 5 can be made lightweight, and as a result, the power storage device 1 can be made lightweight.

[0099] Next, a preferred mounting configuration of the power storage device 1 of the present embodiment to the vehicle 100 will be described. Figure 8 is a perspective view showing the power storage device and the frame of the present embodiment. As shown in Figure 8 , the frame 101 constitutes a vehicle skeletal member of the vehicle 100.

[0100] The frame 101, for example, as shown in Figure 8 , has, when viewed from the Z-axis direction, a main body portion 101a formed in a frame shape, and a beam portion 101b fixed to the main body portion 101a in a manner of being erected on a portion extending in the X-axis direction on the Y-axis + side and a portion extending in the X-axis direction on the Y-axis - side in the main body portion 101a.

[0101] The beam portion 101b, for example, as shown in Figure 8 , extends in the Y-axis direction, and is a seat cross member for fixing a seat of the vehicle 100. The beam portion 101b, for example, is arranged at intervals in the X-axis direction.

[0102] To such a frame 101, for example, as shown in Figures 4 to 6 , the flange portion 21b of the upper case 21 of the case 3 and the flange portion 22b of the lower case 22 in the power storage device 1 are desirably fixed to the main body portion 101a of the frame 101 from below.

[0103] At this time, when viewed from the Z-axis direction, as shown in Figure 4As shown, it is desirable that the electric storage device 1 be fixed to the frame 101 of the vehicle 100 in a manner that at least a portion of the gap filling member 5 is disposed between the beam portions 101b of the frame 101.

[0104] Also, it is desirable that the upper case 21 of the electric storage device 1 constitute a floor surface (floor panel) of the passenger compartment of the vehicle 100. In the case where the passenger compartment of the vehicle 100 is constituted in this manner, it is desirable that a floor mat, a floor silencer, or the like be disposed on the Z-axis + side surface of the upper case 21 of the electric storage device 1.

[0105] That is, since the gap filling member 5 has less adverse effects even when subjected to a load as compared to the battery cell 10, it is desirable that the gap filling member 5 be disposed at a portion that is likely to be subjected to a load from the Z-axis direction. Thus, the mounting structure of the electric storage device 1 of the present embodiment to the vehicle 100 can reduce adverse effects caused by input of a load to the battery cell 10.

[0106] Furthermore, in the case where the upper case 21 of the electric storage device 1 constitutes a floor surface of the passenger compartment of the vehicle 100, it is not necessary to provide a floor surface separately from the frame 101 as in a general vehicle. Thus, it is possible to achieve weight reduction of the vehicle 100.

[0107] In addition, it is possible to dispose the electric storage device 1 at a high position from the ground when the electric storage device 1 is mounted to the vehicle 100, and it is possible to achieve a minimum ground clearance of the electric storage device 1. However, it is also possible to dispose a portion of the gap filling member 5 so as to overlap the beam portion 101b of the frame 101 as viewed in the Z-axis direction. In addition, the upper case 21 of the electric storage device 1 can be fixed to the beam portion 101b of the frame 101.

[0108] The present disclosure is not limited to the above-described embodiments, and can be appropriately changed within the scope of the gist.

[0109] For example, in the above-described embodiments, the battery cells 10 are stacked in the X-axis direction, but can be stacked in the Y-axis direction, and the disposition of the reinforcement member 4 and the gap filling member 5 is desirably appropriately changed depending on the stacking direction of the battery cells 10.

[0110] For example, the battery cell 10 of the above-described embodiments is provided with the first electrode terminal 12 at the end portion of the battery case 11 on the Y-axis + side, and the second electrode terminal 13 at the end portion of the battery case 11 on the Y-axis - side, but the disposition of the first electrode terminal 12 and the second electrode terminal 13 is not limited thereto, and for example, the first electrode terminal 12 and the second electrode terminal 13 can be provided at the end portion of the battery case 11 on the Z-axis + side, or the like.

[0111] For example, the configuration of the gap filling member 5 of the above-described embodiment is an example, and as long as it is a shape capable of filling the remaining space inside the power storage device 1, for example, the length of the gap filling member 5 in the X-axis direction can also be approximately equal to the battery cell 10. In addition, the fourth portion 31d of the first member 31 in the gap filling member 5 can also be omitted.

[0112] For example, it is preferable that the gap filling member 5 protrude to the Y-axis + side and the Y-axis - side with respect to the battery cell 10 when viewed from the X-axis direction. Thereby, when an impact is applied to the power storage device 1 from the Y-axis direction, the gap filling member 5 comes into contact with the reinforcing member 4 before the battery cell 10, and damage to the battery cell 10 can be suppressed.

[0113] For example, the first portion 31a of the first member 31 in the gap filling member 5 of the above-described embodiment can be in direct contact with the surface on the Z-axis - side of the housing portion 21a of the upper case 21, or can be in contact via a rigid plate material or the like, such as a surface pressure dispersion member, for dispersing a load input to the power storage device 1 from the Z-axis + side.

[0114] In light of the foregoing disclosure, it will be apparent to those of ordinary skill in the art that the embodiments of the disclosure can be varied in a number of ways. Such variations are not to be regarded as a departure from the spirit and scope of the disclosure, and all such modifications as would be obvious to one skilled in the art are intended to be included within the scope of the following claims.

Claims

1. An electric storage device, comprising: a battery module having a plurality of battery cells stacked in a first direction; and a case that houses the battery module, the electric storage device having: a reinforcing member disposed between the battery modules arranged in a second direction orthogonal to the first direction and the up-down direction, extending in the first direction; and a gap filling member disposed between the case and the battery module in the first direction, the reinforcing member having a protruding portion that protrudes from an end portion of the battery module toward an outside of the electric storage device in the first direction when viewed from the second direction, the gap filling member overlapping the protruding portion of the reinforcing member when viewed from the second direction.

2. The electric storage device according to claim 1, the gap filling member having a first member, the first member having: a first portion in contact with an upper case of the case disposed above the battery module; a second portion in contact with a lower case of the case disposed below the battery module; and a third portion connecting the first portion and the second portion, the first portion having a larger area than the third portion when viewed in the up-down direction.

3. The electric storage device according to claim 1, the gap filling member having a first member, the first member having: a first portion in contact with an upper case of the case disposed above the battery module; a second portion in contact with a lower case of the case disposed below the battery module; a third portion connecting the first portion and the second portion; and a fourth portion protruding from the first portion toward the second direction, the fourth portion being supported by the protruding portion of the reinforcing member.

4. The electric storage device according to claim 2, the second portion having a larger area than the third portion when viewed in the up-down direction.

5. The electric storage device according to claim 4, the gap filling member having a second member, the second member being disposed between the third portions of the first member that are separately disposed in the second direction, the second member having a smaller density than the first member.

6. A vehicle mounting structure of an electric storage device, the vehicle mounting structure being the electric storage device according to any one of claims 1 to 5, an upper case of the case disposed above the battery module constituting a floor surface of a passenger compartment of a vehicle.

7. The vehicle mounting structure of an electric storage device according to claim 6, the vehicle having a pair of seat cross members extending in a width direction, the gap filling member being disposed between the pair of seat cross members when viewed from above.

8. The vehicle mounting structure of an electric storage device according to claim 7, the gap filling member overlapping at least a portion of one of the pair of seat cross members when viewed from above. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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