Power storage device

Abstract

To achieve a miniaturization of a power storage device.SOLUTION: A power storage device (1) according to the present disclosure includes: a first cover; a plurality of battery cells (10) disposed above the first cover and each of which includes a pair of electrode terminals disposed on a pair of surfaces facing each other in a first direction, respectively; a reinforcement member (4) disposed between the plurality of battery cells (10) and below the electrode terminals; and a second cover disposed below the first cover. The power storage device includes a first connection member (6) that is disposed between the first cover and the second cover and connects the first cover and the second cover, and at least a part of the first connection member (6) overlaps the reinforcement member (4) as viewed from a vertical direction.SELECTED DRAWING: Figure 5

Description

[Technical Field]

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

[0002] For example, the energy storage device of Patent Document 1 includes a tray with an opening, battery cells housed in the tray, a sealing plate that seals the opening of the tray, and a protective plate that is placed below the tray. The energy storage device of Patent Document 1 is configured such that electrode terminals placed on the side surfaces of the battery cells are connected to a wiring box via the sealing plate. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2023-530010 Summary of the Invention [Problem to be solved by the invention]

[0004] The present applicant has found the following problem: In the electricity storage device of Patent Document 1, for example, when an impact is applied to the electricity storage device from below, a space must be secured between the protective plate and the tray so that the protective plate can deform due to the impact, which poses a problem of increasing the size of the electricity storage device.

[0005] The present disclosure has been made in consideration of such problems, and aims to achieve miniaturization of a power storage device. [Means for solving the problem]

[0006] A power storage device according to one embodiment of the present disclosure includes: The first cover and a plurality of battery cells disposed above the first cover, each having a pair of electrode terminals disposed on a pair of surfaces facing each other in a first direction; a reinforcement member disposed below the electrode terminal and between the plurality of battery cells; a second cover disposed below the first cover; A power storage device comprising: a first connecting member disposed between the first cover and the second cover and connecting the first cover and the second cover; When viewed from the top-bottom direction, at least a portion of the first connection member overlaps with the reinforcement member.

[0007] In the above-described power storage device, the reinforcement member extends in a second direction perpendicular to the first direction and the up-down direction, the first connecting member includes a first protruding portion extending in the second direction and protruding in the up-down direction; The width of the first protrusion is preferably equal to or greater than the width of the reinforcement member.

[0008] In the above-described power storage device, it is preferable that an end portion of the first protrusion in the first direction and an end portion of the reinforcement member in the first direction overlap with each other when viewed from the top-bottom direction.

[0009] The above-mentioned power storage device includes an intermediate member disposed at least partially between the battery cells arranged in a second direction perpendicular to the first direction and the up-down direction, The intermediate member preferably protrudes in the first direction relative to the battery cell.

[0010] The above-mentioned power storage device includes a second connection member that is disposed between the first cover and the second cover and connects the first cover and the second cover, It is preferable that at least a portion of the second connecting member overlaps with the intermediate member when viewed from the top-bottom direction.

[0011] In the above-described power storage device, the intermediate member extends in the first direction, the second connection member includes a second protrusion extending in the first direction and protruding in the up-down direction; The width of the second protrusion is preferably equal to or greater than the width of the intermediate member.

[0012] In the above-described power storage device, it is preferable that an end portion of the second protrusion in the second direction overlaps with an end portion of the intermediate member in the second direction when viewed from the top-bottom direction.

[0013] In the above-described power storage device, it is preferable that an elastic member be disposed between the first cover and the second connecting member. [Effects of the Invention]

[0014] According to the present disclosure, it is possible to achieve miniaturization of the power storage device. [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] 5A and 5B are diagrams illustrating the arrangement of reinforcement members, a lower case, a first connecting member, and a shear panel in the energy storage device according to the embodiment. [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] 5A and 5B are diagrams illustrating the arrangement of first and second connecting members of the power storage device 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] FIG. 1 is a diagram showing a state in which the power storage device of this embodiment is mounted on a vehicle. Power storage device 1 is suitable as a power storage device mounted on vehicle 100, for example, as shown in FIG. 1. Here, the positive side of the X axis is the front side of vehicle 100, and the negative side of the X axis is the rear side of vehicle 100. The positive side of the Y axis is the left side of vehicle 100, and the negative side of the Y axis is the right side of vehicle 100. The positive side of the Z axis is the upper side of vehicle 100, and the negative side of the Z axis is the lower side of vehicle 100. In other words, it is assumed that vehicle 100 is placed on a horizontal plane.

[0018] Fig. 2 is an exploded view showing a simplified version of the energy storage device of the present embodiment. Fig. 3 is a diagram for explaining the arrangement of the reinforcement members, lower case, first connecting member, and shear panel in the energy storage device of the present embodiment. Fig. 4 is an XZ cross-sectional view of the energy storage device of the present embodiment.

[0019] 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 diagram for explaining the arrangement of the first connecting member and the second connecting member in the energy storage device of the present embodiment.

[0020] As shown in FIGS. 2 to 7, the electricity storage device 1 includes a battery module 2, a pack case 3, a reinforcement member 4, a share panel (second cover) 5, a first connecting member 6, and a second connecting member 7.

[0021] As shown by the phantom lines in Fig. 4, the battery module 2 includes a plurality of battery cells 10 and an intermediate member 11. The battery cell 10 is formed by, for example, housing an electrode body inside a battery case 12 as shown in Fig. 5.

[0022] For example, as shown in FIG. 5, a first electrode terminal 13, either a positive electrode terminal or a negative electrode terminal, is provided at the end of the battery case 12 on the + side of the Y axis, and a second electrode terminal 14, either a positive electrode terminal or a negative electrode terminal, is provided at the end of the battery case 12 on the - side of the Y axis.

[0023] The battery cells 10 are stacked in the X-axis direction such that the positive electrode terminals and negative electrode terminals are alternately arranged in the X-axis direction (second direction) on each of the Y-axis + side and Y-axis - side of the battery module 2. On the Y-axis + side of the battery module 2, first electrode terminals 13 adjacent to each other in the X-axis direction are electrically connected by a first bus bar 15, and on the Y-axis - side of the battery module 2, second electrode terminals 14 adjacent to each other in the X-axis direction are electrically connected by a second bus bar 16.

[0024] As a result, the plurality of battery cells 10 are electrically connected in series. As shown in Fig. 4, such a plurality of battery cells 10 constitute a battery cell group 17, and the battery cell groups 17 are aligned in the X-axis direction. For example, in the example shown in Fig. 4, two battery cell groups 17 are aligned in the X-axis direction.

[0025] As shown in Fig. 4, the intermediate member 11 is disposed between adjacent battery cell pairs 17 in the X-axis direction. As shown in Fig. 6, the intermediate member 11 has substantially the same shape as the battery case 12 of the battery cell 10, and is a plate body substantially parallel to the YZ plane. In other words, the intermediate member 11 extends in the Y-axis direction (first direction). The intermediate member 11 may be, for example, a hollow extruded member made of aluminum or a solid rigid member made of resin.

[0026] The intermediate members 11 and the battery cell sets 17 may be constrained, for example, in the X-axis direction to form the battery module 2. In this case, although detailed functions will be described later, as shown in Fig. 6, the intermediate members 11 may protrude to the +Y-axis side and the -Y-axis side relative to the battery cells 10 when viewed from the X-axis direction.

[0027] 2 to 6, the pack case 3 houses the battery module 2. The pack case 3 includes an upper case 21 and a lower case (first cover) 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 module 2, and a flange portion 21b that protrudes outward from the periphery of the housing portion 21a.

[0028] As shown in Figures 2 to 6, for example, the lower case 22 has a storage section 22a that is recessed toward the negative Z-axis 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.

[0029] With the battery modules 2 arranged at a predetermined interval in the Y-axis 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. At this time, it is preferable that a first elastic member 31 such as a urethane foam sheet be disposed between the intermediate member 11 and the housing portion 22a of the lower case 22, as shown in FIG.

[0030] The reinforcement member 4 is a rigid member that receives a load in the X-axis direction when the load is input to the energy storage device 1. As shown in Fig. 3 and Fig. 5 , 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 with respect to the first bus bar 15 and the second bus bar 16 that face each other in the Y-axis direction, and extends in the X-axis direction.

[0031] As shown in Figures 5 and 6, for example, the reinforcement member 4 is approximately hat-shaped with a protruding portion 4a that protrudes toward the +Z-axis side when viewed from the X-axis direction, and the end portion of the reinforcement member 4 on the -Z-axis side is fixed to the surface on the +Z-axis side of the accommodation portion 22a of the lower case 22.

[0032] In this case, the protrusions 4a of the reinforcement members 4 are disposed between the battery modules 2 adjacent in the Y-axis direction, for example, as shown in Figures 5 and 6. However, the shape of the reinforcement members 4 is not limited, and they may be any members that are long in the X-axis direction.

[0033] 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 battery module 2 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 battery module 2 on the negative side of the X axis.

[0034] In this case, when viewed from the Z-axis direction, the reinforcement member 4 preferably overlaps with at least a portion of the first bus bar 15 and the second bus bar 16 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 15 and the second bus bar 16 that face each other in the Y-axis direction, which can contribute to miniaturization of the battery module 2.

[0035] 3 to 6, the shear panel 5 covers the lower case 22 from the negative side along the Z axis. The shear panel 5 has, for example, a recess 5a recessed toward the negative side of the Z axis to ensure deformation space for the shear panel 5 toward the positive side along the Z axis, and a flange portion 5b protruding outward from the periphery of the recess 5a. The flange portion 5b of the shear panel 5 is fixed to the periphery of the lower case 22, for example.

[0036] 5, the first connecting member 6 is disposed between the lower case 22 and the shear panel 5 so that at least a portion of the first connecting member 6 overlaps with the reinforcement member 4 when viewed from the Z-axis direction, and connects the lower case 22 and the shear panel 5. When viewed from the X-axis direction, the first connecting member 6 has, for example, a hat shape having a protruding portion (first protruding portion) 6a that protrudes toward the +Z-axis side, and extends in the X-axis direction as shown in FIG.

[0037] 5, the end of the first connecting member 6 on the negative Z-axis side is fixed to the surface of the recess 5a of the share panel 5 on the positive Z-axis side. This allows the first connecting member 6 to function as a reinforcing member for the share panel 5. The end of the protruding portion 6a of the first connecting member 6 on the positive Z-axis side is in contact with the surface of the accommodation portion 22a of the lower case 22 on the negative Z-axis side.

[0038] As a result, when an impact is applied to the share panel 5 from the negative side of the Z axis, the transmission of the impact at the recess 5a of the share panel 5 can be stopped by the first connecting member 6, thereby reducing the EA (Energy Absorption) stroke.

[0039] Therefore, compared to a typical energy storage device, the space in the Z-axis direction in which the share panel 5 deforms when an impact is applied to the share panel 5 is smaller, which contributes to the miniaturization of the energy storage device 1. Furthermore, the bending rigidity of the share panel 5 around the Y-axis can be improved, allowing the share panel 5 to be made thinner. As a result, the weight of the energy storage device 1 can be reduced.

[0040] Furthermore, when an impact is applied to the share panel 5 from the negative side of the Z axis, the load of the impact can be released to the reinforcement member 4 via the first connecting member 6. This eliminates the need for a rigid structure like the share panels of general energy storage devices, and allows the share panel 5 to be made thinner. As a result, the weight of the energy storage device 1 can be reduced.

[0041] At this time, for example, it is preferable to fix the shear panel 5 and the first connecting member 6 to the reinforcement member 4 by screwing a bolt inserted through through holes formed in the shear panel 5, the first connecting member 6, and the lower case 22 into a weld nut housed inside the reinforcement member 4. This makes it possible to suppress vibration of the shear panel 5.

[0042] 5, for example, it is preferable that the width dimension W1 in the Y-axis direction of the end portion on the +Z-axis side of the protrusion 6a of the first connecting member 6 is equal to or greater than the width W2 in the Y-axis direction of the end portion on the -Z-axis side of the protrusion 4a of the reinforcement member 4. In other words, the width dimensions W1 and W2 are lengths in the Y-axis direction, which is perpendicular to the X-axis and Z-axis directions. This ensures that when an impact is applied to the shear panel 5 from the -Z-axis side, the load caused by the impact can be reliably released to the reinforcement member 4 via the first connecting member 6.

[0043] More preferably, for example, as shown in Figure 5, the width dimension W1 in the Y-axis direction of the end of the protrusion 6a of the first connecting member 6 on the +Z-axis side is approximately equal to the width dimension W2 in the Y-axis direction of the protrusion 4a of the reinforcement member 4 on the -Z-axis side.

[0044] In this case, as shown in Figure 5, when viewed from the Z-axis direction, it is preferable that the end of the protrusion 6a of the first connecting member 6 on the +Y-axis side roughly overlaps with the end of the protrusion 4a of the reinforcement member 4 on the +Y-axis side, and the end of the protrusion 6a of the first connecting member 6 on the -Y-axis side overlaps with the end of the protrusion 4a of the reinforcement member 4 on the -Y-axis side.

[0045] As a result, when viewed from the Z-axis direction, the protrusion 6a of the first connecting member 6 is positioned between adjacent battery modules 2 in the Y-axis direction, and when an impact is applied to the share panel 5 from the negative Z-axis side, the first connecting member 6 can be prevented from pushing up against the battery cell 10.

[0046] In addition, the end portion on the Z-axis + side of the protrusion 6a of the first connecting member 6 may contact the Z-axis - side surface of the accommodating portion 22a of the lower case 22 via a second elastic member (not shown) such as a urethane foam sheet, or may directly contact the Z-axis - side surface of the accommodating portion 22a of the lower case 22.

[0047] As shown in Figures 4 and 6, the second connecting member 7 is arranged between the lower case 22 and the share panel 5 so that at least a portion of the second connecting member 7 overlaps with the intermediate member 11 when viewed from the Z-axis direction, connecting the lower case 22 and the share panel 5.

[0048] 4, the second connecting member 7 has a hat shape with a protrusion (second protrusion) 7a that protrudes toward the positive side of the Z axis when viewed from the X axis direction. The second connecting member 7 extends in the Y axis direction and is disposed so as not to interfere with the first connecting member 6, as shown in FIG.

[0049] 4, the end of the second connecting member 7 on the negative side of the Z axis is fixed to the surface on the positive side of the Z axis of the recess 5a of the shear panel 5. This allows the second connecting member 7 to also function as a reinforcing member for the shear panel 5.

[0050] The end of the protrusion 7a of the second connecting member 7 on the Z-axis + side may be in contact with the Z-axis - side surface of the accommodating portion 22a of the lower case 22 via a third elastic member 32 such as a urethane foam sheet, as shown in Figure 4.

[0051] As a result, when an impact is applied to the share panel 5 from the negative side of the Z axis, the transmission of the impact at the recess 5a of the share panel 5 can be stopped not only by the first connecting member 6 but also by the second connecting member 7, thereby further reducing the EA stroke.

[0052] Therefore, compared to a typical energy storage device, the space in the Z-axis direction in which the share panel 5 deforms when an impact is applied to the share panel 5 is smaller, which contributes to the miniaturization of the energy storage device 1. Furthermore, the bending rigidity of the share panel 5 around the X-axis can be improved, allowing the share panel 5 to be made thinner. As a result, the weight of the energy storage device 1 can be reduced.

[0053] Furthermore, when an impact is applied to the share panel 5 from the negative side of the Z axis, the load caused by the impact can be released to the intermediate member 11 via the second connecting member 7. Therefore, there is no need to use a rigid structure like the share panels of general energy storage devices, and the share panel 5 can be made thinner, resulting in a reduction in the weight of the energy storage device 1.

[0054] 4, for example, it is preferable that the width dimension W3 in the X-axis direction of the end portion of the protrusion 7a of the second connecting member 7 on the +Z-axis side be equal to or greater than the width W4 in the X-axis direction of the end portion of the intermediate member 11 on the -Z-axis side. In other words, the width dimensions W3 and W4 are lengths in the X-axis direction, which is perpendicular to the Y-axis and Z-axis directions. This ensures that when an impact is applied to the shear panel 5 from the -Z-axis side, the load caused by the impact can be reliably released to the intermediate member 11 via the second connecting member 7.

[0055] More preferably, for example, as shown in FIG. 4, the width dimension W3 in the X-axis direction of the end of the protrusion 7a of the second connecting member 7 on the +Z-axis side is approximately equal to the width dimension W4 in the X-axis direction of the end of the intermediate member 11 on the -Z-axis side.

[0056] In this case, as shown in FIG. 4, when viewed from the Z-axis direction, the end of the protrusion 7a of the second connecting member 7 on the +X-axis side roughly overlaps with the end of the intermediate member 11 on the +X-axis side, and the end of the protrusion 7a of the second connecting member 7 on the -X-axis side roughly overlaps with the end of the intermediate member 11 on the -X-axis side.

[0057] As a result, when viewed from the Z-axis direction, the protrusion 7a of the second connecting member 7 is positioned between adjacent battery cell sets 17 in the X-axis direction, and when an impact is applied to the share panel 5 from the negative Z-axis side, the second connecting member 7 can be prevented from pushing up against the battery cells 10.

[0058] In such an energy storage device 1, for example, as shown in Figures 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 energy storage device 1 may be fixed from below to a frame-shaped frame 101 of the vehicle 100.

[0059] As described above, the energy storage device 1 of this embodiment is provided with a first connecting member 6 that is arranged between the lower case 22 and the share panel 5 so as to overlap at least a portion of the reinforcement member 4 when viewed from the Z-axis direction, and that connects the lower case 22 and the share panel 5.

[0060] As a result, when an impact is applied to the share panel 5 from the negative side of the Z axis, the transmission of the impact to the recess 5a of the share panel 5 can be stopped by the first connecting member 6, and the EA stroke can be reduced.

[0061] Therefore, compared to a typical energy storage device, the space in the Z-axis direction in which the share panel 5 deforms when an impact is applied to the share panel 5 is smaller, which contributes to the miniaturization of the energy storage device 1. Furthermore, the bending rigidity of the share panel 5 around the Y-axis can be improved, allowing the share panel 5 to be made thinner. As a result, the weight of the energy storage device 1 can be reduced.

[0062] Furthermore, when an impact is applied to the share panel 5 from the negative side of the Z axis, the load of the impact can be released to the reinforcement member 4 via the first connecting member 6. This eliminates the need for a rigid structure like the share panels of general energy storage devices, and allows the share panel 5 to be made thinner. As a result, the weight of the energy storage device 1 can be reduced.

[0063] Furthermore, in the energy storage device 1 of this embodiment, when viewed from the X-axis direction, if the intermediate members 11 protrude toward the Y-axis + side and the Y-axis − side relative to the battery cells 10, when an impact is applied to the energy storage device 1 from the Y-axis direction, the intermediate members 11 come into contact with the protruding portions 4a of the reinforcement members 4 before the battery cells 10, thereby preventing damage to the battery cells 10.

[0064] Furthermore, in the energy storage device 1 of this embodiment, when the shared panel 5 is connected to the storage section 22a of the lower case 22 via the second elastic member and the third elastic member 32, the shared panel 5 can be securely connected to the storage section 22a of the lower case 22 via the second elastic member and the third elastic member 32, and vibration of the shared panel 5 can be suppressed.

[0065] Furthermore, in the energy storage device 1 of this embodiment, when the first elastic member 31 is arranged between the storage section 22a of the lower case 22 and the intermediate member 11, when an impact is applied to the share panel 5 from the Z-axis negative side, the load caused by the impact can be reliably released to the intermediate member 11 via the second connecting member 7.

[0066] The present disclosure is not limited to the above-described embodiments, and can be modified as appropriate within the scope of the present disclosure.

[0067] 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 intermediate member 11, the first connecting member 6, and the second connecting member 7 may also be changed appropriately depending on the stacking direction of the battery cells 10.

[0068] For example, although the first connecting member 6 and the second connecting member 7 in the above embodiment are substantially hat-shaped, they may have any shape that allows a load to be transmitted between the lower case 22 and the shear panel 5. Also, any of the first elastic member 31, the second elastic member, and the third elastic member 32 may be omitted.

[0069] For example, the first connecting member 6 and the second connecting member 7 in the above embodiment are fixed to the shear panel 5, but they may be fixed to the lower case 22, or may not be fixed to the lower case 22 or the shear panel 5. In short, it is sufficient that the first connecting member 6 and the second connecting member 7 connect the lower case 22 and the shear panel 5 so as to be able to transmit a load.

[0070] For example, the shapes of the intermediate member 11 and the second connecting member 7 in the above embodiment are merely examples, and any configuration is sufficient as long as, when an impact is applied to the share panel 5 from the negative side of the Z axis, the load caused by the impact can be released to the intermediate member 11 via the second connecting member 7. Furthermore, although the above embodiment includes the intermediate member 11 and the second connecting member 7, the intermediate member 11 and the second connecting member 7 may be omitted. [Explanation of symbols]

[0071] 1. Energy storage device 2 Battery Module 3-pack case 4 reinforcement member, 4a protrusion 5 Shear panel, 5a Recess, 5b Flange 6 first connecting member, 6a protrusion 7 second connecting member, 7a protrusion 10 battery cells 12 Battery case 13 First electrode terminal 14 Second electrode terminal 15 First bus bar 16 Second busbar 17 Battery cell assembly 21 upper case, 21a housing portion, 21b flange portion 22 lower case, 22 housing portion, 22b flange portion 31 first elastic member 32 third elastic member 100 vehicles 101 frames W1: Width dimension in the Y-axis direction of the protrusion of the first connection member W2: Width dimension of the reinforcement member protrusion in the Y-axis direction W3: Width dimension in the X-axis direction of the protrusion of the second connecting member W4 Width dimension in the X-axis direction of the end of the intermediate part

Claims

1. A first cover; a plurality of battery cells disposed above the first cover, each having a pair of electrode terminals disposed on a pair of surfaces facing each other in a first direction; a reinforcement member disposed below the electrode terminal and between the plurality of battery cells; a second cover disposed below the first cover; A power storage device comprising: a first connecting member disposed between the first cover and the second cover and connecting the first cover and the second cover; The power storage device, wherein at least a portion of the first connection member overlaps with the reinforcement member when viewed from the top-bottom direction.

2. The reinforcement member extends in a second direction perpendicular to the first direction and the up-down direction, the first connecting member includes a first protruding portion extending in the second direction and protruding in the up-down direction, The power storage device according to claim 1 , wherein a width dimension of the first protrusion is equal to or greater than a width dimension of the reinforcement member.

3. The power storage device according to claim 2 , wherein an end of the first protrusion in the first direction overlaps an end of the reinforcement member in the first direction when viewed from the top-bottom direction.

4. an intermediate member disposed at least partially between the battery cells arranged in a second direction perpendicular to the first direction and the up-down direction; The power storage device according to claim 1 , wherein the intermediate member protrudes in the first direction relative to the battery cell.

5. a second connecting member disposed between the first cover and the second cover and connecting the first cover and the second cover; The power storage device according to claim 4 , wherein at least a portion of the second connecting member overlaps with the intermediate member when viewed from the top-bottom direction.

6. the intermediate member extends in the first direction; the second connection member includes a second protruding portion extending in the first direction and protruding in the up-down direction, The power storage device according to claim 5 , wherein a width dimension of the second protrusion is equal to or greater than a width dimension of the intermediate member.

7. The power storage device according to claim 6 , wherein an end of the second protrusion in the second direction overlaps an end of the intermediate member in the second direction when viewed from the top-bottom direction.

8. The power storage device according to claim 7 , wherein an elastic member is disposed between the first cover and the second connecting member.

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