Power storage device and vehicle mounting structure for the power storage device

Abstract

To achieve a power storage device capable of suppressing occurrence of condensation inside a case even if the case is shared.SOLUTION: A power storage device (1) according to one aspect of the present disclosure includes a battery module (2) including a plurality of battery cells (10) and a case (3) housing the battery module (2). The power storage device has a reinforcement member (4) disposed between the battery modules (2) and a gap filling member (5) disposed between the case (3) and the battery module (2). The reinforcement member (4) has a projection (4a) projecting from an end portion of the battery module (2) toward the outside of the power storage device (1). The gap filling member (5) overlaps the projection (4a) of the reinforcement member (4).SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present disclosure relates to an electricity storage device and a vehicle mounting structure for the electricity storage device. [Background technology]

[0002] A typical energy storage device, as disclosed in Patent Document 1, for example, has a configuration in which a battery module made up of stacked battery cells is housed in a case and arranged in a direction perpendicular to the stacking direction of the battery cells. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-128961 Summary of the Invention [Problem to be solved by the invention]

[0004] For example, if excess space is formed inside the case when using a common case but changing the number or type of battery cells installed, there is a possibility that condensation will occur inside the case due to the moisture contained in the air in that excess space.

[0005] The present disclosure has been made in consideration of such problems, and provides an energy storage device and a vehicle mounting structure for the energy storage device that can suppress the occurrence of condensation inside the case even when the case is shared. [Means for solving the problem]

[0006] A power storage device according to one embodiment of the present disclosure includes: a battery module having a plurality of battery cells stacked in a first direction; a case that houses the battery module; A power storage device comprising: a reinforcement member disposed between the battery modules arranged in a second direction perpendicular to the first direction and the up-down direction, and extending in the first direction; a filler member disposed between the case and the battery module in the first direction; and the reinforcement member has a protruding portion that protrudes from an end of the battery module in the first direction toward an outside of the power storage device when viewed from the second direction, The filling member overlaps the protruding portion of the reinforcement member when viewed from the second direction.

[0007] In the above-described energy storage device, the filling member includes a first member, The first member includes: a first portion of the case that comes into contact with an upper case that is disposed above the battery module; a second portion of the case that contacts a lower case that is disposed below the battery module; a third portion connecting the first portion and the second portion; and It is preferable that the first portion has a larger area than the third portion when viewed from above.

[0008] In the above-described energy storage device, the filling member includes a first member, The first member includes: a first portion of the case that comes into contact with an upper case that is disposed above the battery module; a second portion of the case that contacts a lower case that is disposed below the battery module; a third portion connecting the first portion and the second portion; a fourth portion protruding from the first portion in the second direction; and The fourth portion is preferably supported by a protruding portion of the reinforcement member.

[0009] In the above-described power storage device, it is preferable that the second portion has a larger area than the third portion when viewed in the top-bottom direction.

[0010] In the above-described energy storage device, the filling member includes a second member, The second member is preferably disposed between a plurality of the third portions of the first member that are spaced apart in the second direction, and has a lower density than the first member.

[0011] The vehicle mounting structure for the above-mentioned power storage device, An upper case disposed above the battery module in the case constitutes the floor of the passenger compartment of the vehicle.

[0012] In the above-described vehicle mounting structure for an electric storage device, the vehicle includes a pair of seat cross members extending in a width direction, The filling member is preferably disposed between the pair of sheet cloths when viewed from above.

[0013] In the above-described vehicle mounting structure for an electric storage device, it is preferable that the filler member overlaps at least a part of one of the pair of seat cloths when viewed from above. [Effects of the Invention]

[0014] According to the present disclosure, it is possible to realize an electricity storage device and a vehicle mounting structure for the electricity storage device that can suppress the occurrence of condensation inside the case even when the case is shared. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a diagram showing a state in which an electricity storage device according to an embodiment is mounted on a vehicle; [Figure 2] 1 is an exploded view showing a simplified view of an electricity storage device according to an embodiment; [Figure 3] 3 is a diagram showing the arrangement of battery modules and space-filling members inside the energy storage device according to the embodiment, as viewed from the +Z-axis side. FIG. [Figure 4] FIG. 2 is an XZ cross-sectional view of the electricity storage device according to the embodiment. [Figure 5] 5 is a YZ cross-sectional view at the VV position in FIG. 4. [Figure 6] 6 is a YZ cross-sectional view taken along the line VI-VI in FIG. 4. [Figure 7] 10 is a diagram showing a state in which a filling member is supported by a reinforcement member in the energy storage device according to the embodiment. FIG. [Figure 8] FIG. 2 is a perspective view showing the energy storage device and the frame according to the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0016] Specific embodiments to which the present disclosure is applied will be described in detail below with reference to the drawings. However, the present disclosure is not limited to the following embodiments. For clarity of explanation, the following description and drawings have been simplified as appropriate. For clarity of explanation, the following description will be made using a three-dimensional (XYZ) coordinate system.

[0017] First, the configuration of the power storage device 1 of this embodiment will be described. Fig. 1 is a diagram showing a state in which the power storage device of this embodiment is mounted on a vehicle. The power storage device 1 is suitable as a power storage device mounted on a vehicle 100, for example, as shown in Fig. 1.

[0018] Here, the positive side of the X axis is the front side of the vehicle 100, and the negative side of the X axis is the rear side of the vehicle 100. The positive side of the Y axis is the left side of the vehicle 100, and the negative side of the Y axis is the right side of the vehicle 100. The positive side of the Z axis is the top side of the vehicle 100, and the negative side of the Z axis is the bottom side of the vehicle 100. In other words, it is assumed that the vehicle 100 is placed on a horizontal plane.

[0019] Fig. 2 is an exploded view showing a simplified version of the energy storage device of the present embodiment. Fig. 3 is a view showing the arrangement of battery modules and filler members inside the energy storage device of the present embodiment as viewed from the Z-axis + side. Fig. 4 is an XZ cross-sectional view of the energy storage device of the present embodiment.

[0020] Fig. 5 is a YZ cross-sectional view taken along line VV in Fig. 4. Fig. 6 is a YZ cross-sectional view taken along line VI-VI in Fig. 4. Fig. 7 is a view showing a state in which the filling member is supported by the reinforcement member in the energy storage device of the present embodiment.

[0021] As shown in Fig. 2 to Fig. 7, the energy storage device 1 includes a battery module 2, a pack case 3, a reinforcement member 4, and a space-filling member 5. The battery module 2 includes a plurality of battery cells 10. The battery cell 10 is formed by, for example, housing an electrode body inside a battery case 11 as shown in Fig. 5.

[0022] For example, as shown in FIG. 5, a first electrode terminal 12, either a positive electrode terminal or a negative electrode terminal, is provided at the end of the battery case 11 on the + side of the Y axis, and a second electrode terminal 13, either a positive electrode terminal or a negative electrode terminal, is provided at the end of the battery case 11 on the - side of the Y axis.

[0023] Such battery cells 10 are stacked in the X-axis direction so that the positive electrode terminals and negative electrode terminals are alternately arranged in the X-axis direction (first direction) on each of the Y-axis + side and Y-axis - side of the battery module 2.

[0024] 5, on the positive side of the Y axis of the battery module 2, first electrode terminals 12 adjacent in the X axis direction are electrically connected by a first bus bar 14, and on the negative side of the Y axis of the battery module 2, second electrode terminals 13 adjacent in the X axis direction are electrically connected by a second bus bar 15. In this way, the battery cells 10 constituting the battery module 2 are electrically connected in series.

[0025] 2 to 7, the pack case 3 houses the battery modules 2. The pack case 3 includes an upper case 21 and a lower case 22. The upper case 21 includes, for example, a housing portion 21a that protrudes toward the positive side of the Z axis and has an internal space capable of housing the battery modules 2, and a flange portion 21b that protrudes outward from the periphery of the housing portion 21a.

[0026] As shown in Figures 2 to 7, for example, the lower case 22 has a storage section 22a that is recessed toward the Z-axis negative side and has an internal space capable of storing the battery module 2, and a flange section 22b that protrudes outward from the periphery of the storage section 22a.

[0027] With battery modules 2 arranged at a predetermined interval in the Y-axis direction (second direction) housed inside the housing portion 21a of the upper case 21 and the housing portion 22a of the lower case 22, the flange portion 21b of the upper case 21 and the flange portion 22b of the lower case 22 are joined with an adhesive member.

[0028] 2 and 3, an excess space is formed between the battery module 2 and the pack case 3 on the +X-axis side or the -X-axis side of the battery module 2 inside the pack case 3. In other words, the battery module 2 is not arranged so as to fill substantially the entire area in the X-axis direction inside the pack case 3.

[0029] Here, the battery module 2 may be arranged, for example, on the side where a device such as a junction box is arranged inside the pack case 3. For example, when a device such as a junction box is arranged on the negative X-axis side of the power storage device 1, the battery module 2 may be arranged on the negative X-axis side inside the pack case 3, as shown in FIGS.

[0030] 2 and 3, in this embodiment, the battery module 2 is arranged on the negative side of the X axis of the energy storage device 1. This allows the wiring extending from devices such as a junction box to each battery cell 10 to be shortened, thereby simplifying the wiring arrangement.

[0031] The reinforcement member 4 is a rigid member that receives a load, for example, in the X-axis direction when the load is input to the energy storage device 1. As shown in Fig. 5 to Fig. 7 , the reinforcement member 4 is disposed between the battery modules 2 adjacent in the Y-axis direction in the space on the negative Z-axis side of the first bus bar 14 and the second bus bar 15 that face each other in the Y-axis direction, and extends in the X-axis direction.

[0032] As shown in Figures 5 and 6, the reinforcement member 4 is generally hat-shaped when viewed from the X-axis direction, and the end of the reinforcement member 4 on the negative side of the Z-axis is fixed to the surface on the positive side of the Z-axis of the accommodation portion 22a of the lower case 22.

[0033] 5 and 6, the negative Z-axis side portion of the reinforcement member 4 may be accommodated in a recess 22c formed in the accommodation portion 22a of the lower case 22. However, the shape of the reinforcement member 4 is not limited as long as it is a member that is long in the X-axis direction.

[0034] For example, it is preferable that the end of the reinforcement member 4 on the positive side of the X-axis reaches near the end of the accommodation portion 22a of the lower case 22 on the positive side of the X-axis, and the end of the reinforcement member 4 on the negative side of the X-axis reaches near the end of the accommodation portion 22a of the lower case 22 on the negative side of the X-axis.

[0035] Therefore, when viewed from the Y-axis direction, the negative X-axis side end of the reinforcement member 4 is disposed near the negative X-axis side end of the battery module 2, and the positive X-axis side portion of the reinforcement member 4 protrudes toward the positive X-axis side from the positive X-axis end of the battery module 2. In other words, as shown in Fig. 7 , the reinforcement member 4 has a protruding portion 4a that protrudes toward the positive X-axis side with respect to the battery module 2.

[0036] Here, when viewed from the Z-axis direction, it is preferable that the reinforcement member 4 overlaps with at least a part of the first bus bar 14 and the second bus bar 15 that face each other in the Y-axis direction. This makes it possible to effectively utilize the space on the negative Z-axis side of the first bus bar 14 and the second bus bar 15 that face each other in the Y-axis direction, which can contribute to making the energy storage device 1 more compact.

[0037] The space-filling members 5 fill the excess space between the battery modules 2 inside the pack case 3 and the pack case 3. As shown in Figs. 6 and 7, the space-filling members 5 are, for example, block members extending in the X-axis direction, and include a first member 31 and a second member 32.

[0038] 4 and 6, the first member 31 is an aggregate of the filler member 5. The first member 31 includes a first portion 31a, a second portion 31b, a third portion 31c, and a fourth portion 31d.

[0039] 4 and 6, the first portion 31a is disposed at the end of the first member 31 on the +Z axis side, and forms a beam member on the +Z axis side of the first member 31. The first portion 31a is, for example, a rectangular flat plate that is approximately parallel to the XY plane, and can be made of a metal plate, an aluminum plate, a rigid resin plate, or the like.

[0040] The length of the first portion 31a in the X-axis direction is a desired length for filling the excess space between the battery module 2 inside the pack case 3 and the pack case 3, as shown in Fig. 4, for example. The length of the first portion 31a in the Y-axis direction is approximately equal to the length of the battery cell 10 in the Y-axis direction, as shown in Fig. 6, for example.

[0041] 4 and 6, the second portion 31b is disposed at the end of the first member 31 on the negative Z-axis side, and forms a beam member on the negative Z-axis side of the first member 31. The second portion 31b has substantially the same configuration as the first portion 31a, and when disposed on the negative Z-axis side of the first portion 31a, it overlaps with the first portion 31a when viewed from the Z-axis direction.

[0042] 6, the third portions 31c are arranged at intervals in the Y-axis direction in the first member 31 and form pillars of the first member 31. The third portions 31c are, for example, plates that are substantially parallel to the XZ plane, and can be made of a corrugated metal plate or aluminum plate, or a cast aluminum plate, an extruded aluminum plate, or a rigid resin plate.

[0043] The length of the third portion 31c in the X-axis direction is approximately equal to the length of the first portion 31a in the X-axis direction, as shown in Fig. 7. The length of the third portion 31c in the Y-axis direction is shorter than the length of the first portion 31a in the Y-axis direction, as shown in Fig. 6.

[0044] 6, the third portion 31c connects the first portion 31a and the second portion 31b. For example, the third portion 31c connects the end portion on the +Y-axis side of the first portion 31a to the end portion on the +Y-axis side of the second portion 31b, and the end portion on the -Y-axis side of the first portion 31a to the end portion on the -Y-axis side of the second portion 31b.

[0045] As a result, the first portion 31a, the second portion 31b, and the third portion 31c form an enclosed space. In this case, when viewed from the Z-axis direction, the areas of the first portion 31a and the second portion 31b are larger than the total area of ​​all the third portions 31c.

[0046] As shown in FIG. 6, the third portion 31c may further connect the first portion 31a and the second portion 31b between the third portion 31c on the +Y-axis side and the third portion 31c on the -Y-axis side.

[0047] 6 and 7, the fourth portion 31d protrudes from the first portion 31a in the Y-axis direction and is a shoulder member for supporting the first member 31 on the reinforcement member 4. The fourth portion 31d is, for example, substantially L-shaped when viewed from the X-axis direction, and includes a vertical portion 31e and a horizontal portion 31f protruding in the Y-axis direction from the end of the vertical portion 31e on the negative Z-axis side.

[0048] The length of the fourth portion 31d in the X-axis direction is, for example, shorter than the length of the first member 31 in the X-axis direction. The length of the fourth portion 31d in the Y-axis direction is, for example, equal to or less than half the distance between the battery cases 11 of the battery modules 2 that face each other in the Y-axis direction.

[0049] 6, the vertical portion 31e of the fourth portion 31d is connected to at least one of the end portion on the +Y-axis side of the first portion 31a and the end portion on the +Y-axis side of the third portion 31c on the +Y-axis side, or the end portion on the -Y-axis side of the first portion 31a and the end portion on the -Y-axis side of the third portion 31c on the -Y-axis side. In this case, the fourth portions 31d are arranged with an interval in the X-axis direction, as shown in FIG.

[0050] As a result, as shown in Figure 6, the fourth portion 31d protrudes at least to the +Y-axis side from the first portion 31a and the third portion 31c on the +Y-axis side, or to the -Y-axis side from the first portion 31a and the third portion 31c on the -Y-axis side.

[0051] In detail, among the battery modules 2 arranged in the Y-axis direction, the filler member 5 arranged in the excess space on the +X-axis side relative to the battery modules 2 arranged on the +Y-axis side may be configured so that the fourth portion 31d protrudes toward the -Y-axis side from the first member 31 and the third portion 31c on the -Y-axis side.

[0052] Among the battery modules 2 arranged in the Y-axis direction, the filler member 5 arranged in the excess space on the X-axis + side relative to the battery modules 2 arranged on the Y-axis - side may be configured so that the fourth portion 31d protrudes toward the Y-axis + side from the first member 31 and the third portion 31c on the Y-axis + side.

[0053] Furthermore, among the battery modules 2 arranged in the Y-axis direction, the filler member 5 arranged in the excess space on the X-axis + side for the battery module 2 arranged between the battery module 2 arranged on the Y-axis + side and the battery module 2 arranged on the Y-axis - side may be configured so that the fourth portion 31d protrudes toward the Y-axis + side from the first member 31 and the third portion 31c on the Y-axis + side, and also protrudes toward the Y-axis - side from the first member 31 and the third portion 31c on the Y-axis - side.

[0054] In these first members 31, as shown in Figure 6, the height from the Z-axis -side end of the second portion 31b to the Z-axis -side end of the horizontal portion 31f of the fourth portion 31d is preferably approximately equal to the height of the reinforcement member 4 in the Z-axis direction.

[0055] The second member 32 may be, for example, a member such as urethane foam that has a lower density than the first member 31. As shown in Figures 4 and 6, the second member 32 is disposed in a space surrounded by the first portion 31a, the second portion 31b, and the third portion 31c.

[0056] In this case, in order to reduce excess space inside the pack case 3, the second member 32 is preferably arranged so as to fill the entire space surrounded by the first portion 31a, the second portion 31b, and the third portion 31c.

[0057] 7, such space-filling members 5 are arranged on the positive side of the X axis with respect to the battery modules 2 so as to fill the excess space between the battery modules 2 inside the pack case 3 and the pack case 3, and overlap with the protruding portions 4a of the reinforcement members 4 when viewed from the Y axis direction. The space-filling members 5 are arranged so as to substantially overlap with the battery modules 2 when viewed from the X axis direction.

[0058] At this time, as shown in Figures 4 and 6, the end portion on the Z-axis + side of the first portion 31a of the first member 31 in the filler member 5 contacts the Z-axis - side surface of the storage section 21a of the upper case 21, and the Z-axis - side end portion of the second portion 31b of the first member 31 contacts the Z-axis + side surface of the storage section 22a of the lower case 22.

[0059] This allows a path to be formed 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.

[0060] Furthermore, a path can be formed that allows the load input to the lower case 22 to escape to the upper case 21 via the second portion 31b, the third portion 31c, and the first portion 31a of the first member 31.

[0061] Then, when the filler member 5 is supported in the accommodating portion 22a of the lower case 22, as shown in Figures 6 and 7, the end portion on the Z-axis negative side of the horizontal portion 31f of the fourth part 31d of the first member 31 in the filler member 5 contacts the end portion on the Z-axis positive side of the protruding portion 4a of the reinforcement member 4.

[0062] This allows not only a path to dissipate the load input to the energy storage device 1 from the Z-axis + side relative to the filler member 5 to the lower case 22 via the first part 31a, the third part 31c and the second part 31b of the first member 31, but also a path to dissipate the load to the reinforcement member 4 via the fourth part 31d of the first member 31.

[0063] In this way, in the energy storage device 1 of the present embodiment, the excess space between the battery modules 2 inside the pack case 3 and the pack case 3 is filled with the filler member 5. Therefore, the excess space inside the energy storage device 1 can be reduced, and the occurrence of condensation inside the energy storage device 1 can be suppressed.

[0064] Moreover, in the energy storage device 1 of this embodiment, the filler member 5 is arranged to overlap the protrusion 4a of the reinforcement member 4 when viewed from the Y-axis direction, so that the rigidity of the energy storage device 1 in the X-axis direction can be improved while suppressing the occurrence of condensation inside the energy storage device 1.

[0065] Furthermore, in the energy storage device 1 of this embodiment, when the end portion on the Z-axis + side of the first portion 31a of the first member 31 in the gap-filling member 5 contacts the Z-axis - side surface of the storage section 21a of the upper case 21 and the Z-axis - side end portion of the second portion 31b of the first member 31 contacts the Z-axis + side surface of the storage section 22a of the lower case 22, the load input from the Z-axis + side to the energy storage device 1 can be effectively dissipated from the upper case 21 to the lower case 22, and the load input from the Z-axis - side to the energy storage device 1 can be effectively dissipated from the lower case 22 to the upper case 21.

[0066] Furthermore, in the energy storage device 1 of this embodiment, if the area of ​​the first portion 31a of the first member 31 of the filler member 5 is larger than the total area of ​​all the third portions 31c, the contact area between the first portion 31a of the first member 31 and the upper case 21 can be increased, and the load input to the energy storage device 1 from the Z-axis + side can be effectively dissipated from the upper case 21 to the filler member 5.

[0067] Similarly, in the energy storage device 1 of this embodiment, if the area of ​​the second portion 31b of the first member 31 of the filler member 5 is larger than the total area of ​​all the third portions 31c, the contact area between the second portion 31b of the first member 31 and the lower case 22 can be increased, and the load input to the energy storage device 1 from the Z-axis - side can be effectively dissipated from the lower case 22 to the filler member 5.

[0068] Furthermore, in the energy storage device 1 of this embodiment, when the filler member 5 is supported by the reinforcement member 4 via the fourth portion 31d of the first member 31, the load input to the energy storage device 1 from the Z-axis + side can be effectively released to the reinforcement member 4 as well.

[0069] Furthermore, in the energy storage device 1 of the present embodiment, when the first members 31 of the space-filling members 5 form the aggregate of the space-filling members 5, and the space formed by the first members 31 is filled with the second members 32 having a lower density than the first members 31, it is possible to reduce the excess space in the energy storage device 1. Moreover, it is possible to reduce the weight of the space-filling members 5, and as a result, it is possible to reduce the weight of the energy storage device 1.

[0070] Next, a preferred mounting structure for the power storage device 1 of this embodiment on the vehicle 100 will be described. Fig. 8 is a perspective view showing the power storage device and frame of this embodiment. As shown in Fig. 8, the frame 101 forms a vehicle framework member of the vehicle 100.

[0071] As shown in FIG. 8, the frame 101 includes a main body 101a formed in a frame shape when viewed from the Z-axis direction, and a beam 101b fixed to the main body 101a so as to span between a portion of the main body 101a on the +Y-axis side extending in the X-axis direction and a portion of the main body 101a on the -Y-axis side extending in the X-axis direction.

[0072] 8, the beam portions 101b extend in the Y-axis direction and are seat cross members to which seats of the vehicle 100 are fixed. The beam portions 101b are arranged at intervals in the X-axis direction, for example.

[0073] For such a frame 101, for example, as shown in FIGS. 4 to 6, the flange portion 21b of the upper case 21 and the flange portion 22b of the lower case 22 of the pack case 3 in the electricity storage device 1 may be fixed to the main body portion 101a of the frame 101 from below.

[0074] In this case, it is preferable that the energy storage device 1 is fixed to the frame 101 of the vehicle 100 so that at least a part of the filler member 5 is disposed between the beam portions 101b of the frame 101 when viewed from the Z-axis direction, as shown in FIG.

[0075] The upper case 21 of the power storage device 1 may form the floor surface (floor panel) of the passenger compartment of the vehicle 100. When forming the passenger compartment of the vehicle 100 in this manner, a floor mat, a floor silencer, or the like may be disposed on the surface of the upper case 21 of the power storage device 1 on the +Z axis side.

[0076] In other words, since the filler members 5 are less adversely affected by a load than the battery cells 10, they should be disposed in locations that are more likely to receive a load in the Z-axis direction. As a result, the mounting structure of the energy storage device 1 of this embodiment on the vehicle 100 can reduce the adverse effects of a load being input to the battery cells 10.

[0077] Furthermore, when the floor of the passenger compartment of vehicle 100 is formed by upper case 21 of power storage device 1, there is no need to provide a separate floor on frame 101 as in a typical vehicle. This allows vehicle 100 to be made lighter.

[0078] Furthermore, when the energy storage device 1 is mounted on the vehicle 100, the energy storage device 1 can be disposed at a position higher than the ground, thereby increasing the minimum ground clearance of the energy storage device 1. However, the filler member 5 may be disposed so that a portion of the filler member 5 overlaps with the beam portion 101b of the frame 101 when viewed from the Z-axis direction. Furthermore, the upper case 21 of the energy storage device 1 may be fixed to the beam portion 101b of the frame 101.

[0079] The present disclosure is not limited to the above-described embodiments, and can be modified as appropriate within the scope of the present disclosure.

[0080] For example, in the above embodiment, the battery cells 10 are stacked in the X-axis direction, but they may also be stacked in the Y-axis direction, and the arrangement of the reinforcement members 4 and the gap-filling members 5 may also be changed appropriately depending on the stacking direction of the battery cells 10.

[0081] For example, in the battery cell 10 of the above embodiment, the first electrode terminal 12 is provided at the end of the battery case 11 on the + side of the Y axis, and the second electrode terminal 13 is provided at the end of the battery case 11 on the - side of the Y axis, but the arrangement of the first electrode terminal 12 and the second electrode terminal 13 is not limited, and for example, the first electrode terminal 12 and the second electrode terminal 13 may be provided at the end of the battery case 11 on the + side of the Z axis.

[0082] For example, the configuration of the filler member 5 in the above embodiment is merely an example, and any shape may be used as long as it can fill the excess space inside the energy storage device 1, and for example, the length of the filler member 5 in the X-axis direction may be approximately equal to that of the battery cell 10. Also, the fourth portion 31d of the first member 31 in the filler member 5 may be omitted.

[0083] For example, when viewed from the X-axis direction, the filler members 5 may protrude toward the positive Y-axis side and the negative Y-axis side relative to the battery cells 10. This allows the filler members 5 to come into contact with the reinforcement members 4 before the battery cells 10 do when an impact is applied to the energy storage device 1 from the Y-axis direction, thereby preventing damage to the battery cells 10.

[0084] For example, the first portion 31a of the first member 31 in the filler member 5 of the above embodiment may be in direct contact with the negative Z-axis side surface of the storage section 21a of the upper case 21, or may be in contact via a rigid plate material such as a surface pressure distribution member for dispersing the load input to the storage device 1 from the positive Z-axis side. [Explanation of symbols]

[0085] 1. Energy storage device 2 Battery Module 3-pack case 4 reinforcement member, 4a protrusion 5 Filler materials 10 battery cells 11 Battery case 12 First electrode terminal 13 Second electrode terminal 14 First busbar 15 Second busbar 21 upper case, 21a housing portion, 21b flange portion 22 lower case, 22a accommodation portion, 22b flange portion, 22c recess 31 first member, 31a first part, 31b second part, 31c third part, 31d fourth section, 31e vertical section, 31f horizontal section 32 Second member 100 vehicles 101 frame, 101a main body, 101b beam

Claims

1. a battery module having a plurality of battery cells stacked in a first direction; a case that houses the battery module; A power storage device comprising: a reinforcement member disposed between the battery modules arranged in a second direction perpendicular to the first direction and the up-down direction, and extending in the first direction; a filler member disposed between the case and the battery module in the first direction; and the reinforcement member has a protruding portion that protrudes from an end of the battery module in the first direction toward an outside of the power storage device when viewed from the second direction, The filling member overlaps with the protruding portion of the reinforcement member when viewed from the second direction.

2. The filler member includes a first member; The first member includes: a first portion of the case that contacts an upper case that is disposed above the battery module; a second portion of the case that contacts a lower case disposed below the battery module; a third portion connecting the first portion and the second portion; and The power storage device according to claim 1 , wherein the first portion has a larger area than the third portion when viewed from above.

3. The filler member includes a first member; The first member includes: a first portion of the case that contacts an upper case that is disposed above the battery module; a second portion of the case that contacts a lower case disposed below the battery module; a third portion connecting the first portion and the second portion; a fourth portion protruding from the first portion in the second direction; and The power storage device according to claim 1 , wherein the fourth portion is supported by a protruding portion of the reinforcement member.

4. The power storage device according to claim 2 , wherein the second portion has a larger area than the third portion when viewed from above.

5. the filler member comprises a second member; The power storage device according to claim 4 , wherein the second member is disposed between a plurality of the third portions of the first member that are spaced apart in the second direction, and has a lower density than the first member.

6. The vehicle mounting structure for the electricity storage device according to any one of claims 1 to 5, An upper case disposed above the battery module in the case constitutes a floor surface of a passenger compartment of the vehicle.

7. The vehicle includes a pair of seat crosses extending in a width direction, The vehicle mounting structure for an electric storage device according to claim 6 , wherein the filler member is disposed between the pair of seat cloths when viewed from above.

8. The structure for mounting an electricity storage device on a vehicle according to claim 7 , wherein the filler member overlaps at least a part of one of the pair of seat cloths when viewed from above.

Images