Electricity storage device

Abstract

The purpose of the present invention is to reduce the size of a power storage device. This electricity storage device is provided with a first cover, battery cells disposed above the first cover, a reinforcing member disposed between the plurality of battery cells, and a second cover disposed below the first cover, and is also provided with a first connection member disposed between the first cover and the second cover and connecting the first cover and the second cover. At least a portion of the first connecting member overlaps the reinforcing member when viewed from the vertical direction.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to an electric storage device. BACKGROUND

[0002] For example, the electric storage device of Patent Literature 1 is provided with a tray in which an opening portion is formed, a battery cell housed in the tray, a sealing plate that seals the opening portion of the tray, and a protection plate disposed below the tray. Moreover, the electric storage device of Patent Literature 1 is configured such that an electrode terminal disposed on a side surface of the battery cell is connected to a wiring box via the sealing plate.

[0003] Patent Literature 1: Japanese Patent Application Laid-Open No. 2023-530010

[0004] The present applicant has found the following problem. In the electric storage device of Patent Literature 1, there is a problem in that, for example, a space in which the protection plate deforms due to an impact when the impact is applied to the electric storage device from below needs to be ensured between the protection plate and the tray, leading to a large size of the electric storage device. SUMMARY

[0005] The present disclosure is completed in view of such a problem point, and achieves a small size of an electric storage device.

[0006] An electric storage device according to one embodiment of the present disclosure is provided with: a first housing; a plurality of battery cells disposed above the first housing and having a pair of electrode terminals respectively disposed on a pair of surfaces opposed in a first direction; a reinforcing member disposed below the electrode terminals and between the plurality of battery cells; and a second housing disposed below the first housing, wherein the electric storage device has a first connecting member disposed between the first housing and the second housing and connecting the first housing and the second housing, and at least a portion of the first connecting member overlaps the reinforcing member when viewed in an up-down direction.

[0007] It is preferable that, in the above electric storage device, the reinforcing member extends in a second direction orthogonal to the first direction and the up-down direction, the first connecting member extends in the second direction and has a first protruding portion protruding in the up-down direction, and a width dimension of the first protruding portion is equal to or greater than a width dimension of the reinforcing member.

[0008] It is preferable that, in the above electric storage device, an end portion of the first protruding portion in the first direction overlaps an end portion of the reinforcing member in the first direction when viewed in the up-down direction.

[0009] Preferably, the 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 protruding in the first direction relative to the battery cells.

[0010] Preferably, the power storage device includes a second connecting member disposed between the first cover and the second cover to connect the first cover and the second cover, wherein at least a portion of the second connecting member overlaps with the intermediate member when viewed in the vertical direction.

[0011] Preferably, in the above-described power storage device, the intermediate member extends in the first direction, the second connecting member extends in the first direction and includes a second protrusion protruding in the vertical direction, and a width dimension of the second protrusion is greater than a width dimension of the intermediate member.

[0012] Preferably, in the above-described power storage device, an end portion of the second protrusion in the second direction overlaps an end portion of the intermediate member in the second direction when viewed in the up-down direction.

[0013] Preferably, in the above-described power storage device, an elastic member is disposed between the first cover and the second connecting member.

[0014] According to the present disclosure, it is possible to reduce the size of the power storage device.

[0015] The above objects 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 THE DRAWINGS

[0016] Figure 1 This is a diagram showing a state in which the power storage device according to the embodiment is mounted on a vehicle.

[0017] Figure 2 This is an exploded view showing a simplified view of the power storage device according to the embodiment.

[0018] Figure 3 These are diagrams for explaining the arrangement of the reinforcement member, the lower case, the first connection member, and the common trim plate in the power storage device according to the embodiment.

[0019] Figure 4 It is an XZ cross-sectional view of the power storage device according to the embodiment.

[0020] Figure 5 yes Figure 4 YZ cross-sectional view at the VV position.

[0021] Figure 6 yes Figure 4YZ cross-sectional view at position VI-VI.

[0022] Figure 7 It is a diagram for explaining the arrangement of the first connecting member and the second connecting member of the power storage device according to the embodiment. DETAILED DESCRIPTION

[0023] Specific embodiments to which the present disclosure may be applied are described in detail below with reference to the accompanying drawings. However, the present disclosure is not limited to the following embodiments. Furthermore, the following description and drawings have been appropriately simplified for clarity. Furthermore, in the following description, a three-dimensional (XYZ) coordinate system is used for clarity.

[0024] Figure 1 : is a diagram showing a state where the power storage device of this embodiment is mounted on a vehicle. Figure 1 As shown, power storage device 1 is suitable as a power storage device mounted on vehicle 100. Here, the X-axis (+) side is the front side of vehicle 100, and the X-axis (-) side is the rear side of vehicle 100. The Y-axis (+) side is the left side of vehicle 100, and the Y-axis (-) side is the right side of vehicle 100. The Z-axis (+) side is the top side of vehicle 100, and the Z-axis (-) side is the bottom side of vehicle 100. In other words, this assumes that vehicle 100 is positioned on a horizontal surface.

[0025] Figure 2 This is an exploded view that simply shows the power storage device according to this embodiment. Figure 3 These are diagrams for explaining the arrangement of the reinforcement member, the lower case, the first connection member, and the common trim plate in the power storage device according to the present embodiment. Figure 4 It is an XZ cross-sectional view of the power storage device according to this embodiment.

[0026] Figure 5 yes Figure 4 YZ cross-sectional view at the VV position. Figure 6 yes Figure 4 YZ cross-sectional view at position VI-VI. Figure 7 These are diagrams for explaining the arrangement of the first connecting member and the second connecting member of the power storage device according to the present embodiment.

[0027] like Figures 2 to 7 As shown, the power storage device 1 includes a battery module 2 , a battery pack case 3 , a reinforcement member 4 , a common trim plate (second cover) 5 , a first connecting member 6 , and a second connecting member 7 .

[0028] As in Figure 4 As indicated by the virtual lines in FIG. 1 , the battery module 2 includes a plurality of battery cells 10 and an intermediate member 11. The battery cells 10 are, for example, Figure 5 The battery case 12 shown here houses the electrode assembly.

[0029] For example, Figure 5 As shown, a first electrode terminal 13 serving as a positive electrode terminal or a negative electrode terminal is provided at the end portion on the Y-axis + side of the battery case 12 , and a second electrode terminal 14 serving as the other positive electrode terminal or the negative electrode terminal is provided at the end portion on the Y-axis - side of the battery case 12 .

[0030] The battery cells 10 are stacked in the X-axis direction so that the positive and negative terminals are alternately arranged along the X-axis direction (the second direction) on the Y-axis positive side and the Y-axis negative side of the battery module 2, respectively. Furthermore, on the Y-axis positive side of the battery module 2, adjacent first electrode terminals 13 in the X-axis direction are electrically connected via a first bus bar 15, and on the Y-axis negative side of the battery module 2, adjacent second electrode terminals 14 in the X-axis direction are electrically connected via a second bus bar 16.

[0031] Thus, the plurality of battery cells 10 are electrically connected in series. Figure 4 As shown, such a plurality of battery cells 10 constitute a battery cell group 17, and the battery cell group 17 is arranged in the X-axis direction. Figure 4 In the example shown in FIG, two battery cell groups 17 are arranged in the X-axis direction.

[0032] like Figure 4 As shown, the intermediate member 11 is disposed between the battery cell groups 17 adjacent to each other in the X-axis direction. Figure 6 As shown, the intermediate member 11 has a shape roughly equivalent to the battery case 12 of the battery cell 10 and is a plate-like body generally parallel to the YZ plane. Specifically, the intermediate member 11 extends in the Y-axis direction (the first direction). The intermediate member 11 can be, for example, a hollow extruded aluminum member or a solid rigid resin member.

[0033] These intermediate components 11 and the battery cell group 17 are constrained in the X-axis direction, for example, to form a battery module 2. Figure 6 As shown, when viewed from the X-axis direction, the intermediate member 11 only needs to protrude toward the Y-axis positive side and the Y-axis negative side relative to the battery cell 10 . The detailed function will be described later.

[0034] like Figures 2 to 6 As shown, the battery pack case 3 houses the battery module 2. The battery 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.

[0035] For example, Figures 2 to 6As shown, the lower case 22 has a receiving portion 22a recessed toward the Z-axis side and having an internal space in which the battery module 2 can be received, and a flange portion 22b protruding from the periphery of the receiving portion 22a toward the outside.

[0036] When the battery module 2 is received in the receiving portion 21a of the upper case 21 and the receiving portion 22a of the lower case 22 in a state in which the battery modules 2 are arranged at a prescribed interval in the Y-axis direction, the flange portion 21b of the upper case 21 and the flange portion 22b of the lower case 22 are joined by the adhesive member. At this time, as shown in Figure 4 As shown, a first elastic member 31 such as a foamed urethane sheet is arranged between the intermediate member 11 and the receiving portion 22a of the lower case 22.

[0037] The reinforcing member 4 is a rigid member that bears a load input to the power storage device 1 in the X-axis direction. As shown in Figure 3 and Figure 5 As 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 of the first bus bar 15 and the second bus bar 16 that are opposite in the Y-axis direction, and extends in the X-axis direction.

[0038] For example, as shown in Figure 5 and Figure 6 As shown, the reinforcing member 4 is substantially hat-shaped with a protruding portion 4a protruding toward the Z-axis + side when viewed in the X-axis direction, and an end portion on the Z-axis - side of the reinforcing member 4 is fixed to a surface on the Z-axis + side of the receiving portion 22a of the lower case 22.

[0039] At this time, for example, as shown in Figure 5 and Figure 6 The protruding portion 4a of the reinforcing member 4 is arranged between the battery modules 2 adjacent in the Y-axis direction. The shape of the reinforcing member 4 is not limited, as long as it is a member that is longer in the X-axis direction.

[0040] For example, an end portion on the X-axis + side of the reinforcing member 4 reaches near an end portion on the X-axis + side of the battery module 2, and an end portion on the X-axis - side of the reinforcing member 4 reaches near an end portion on the X-axis - side of the battery module 2.

[0041] At this time, the reinforcing member 4 overlaps at least a portion of the first bus bar 15 and the second bus bar 16 that are opposite in the Y-axis direction, when viewed in the Z-axis direction. Thus, the space on the Z-axis - side of the first bus bar 15 and the second bus bar 16 that are opposite in the Y-axis direction can be effectively utilized, and thus the miniaturization of the battery module 2 can be facilitated.

[0042] As shown in Figures 3 to 6As shown, the common trim plate 5 covers the lower housing 22 from the Z-axis side. The common trim plate 5 includes, for example, a recessed portion 5a recessed toward the Z-axis side to ensure space for deformation toward the Z-axis side, and a flange portion 5b protruding outward from the periphery of the recessed portion 5a. Furthermore, the flange portion 5b of the common trim plate 5 is fixed to the periphery of the lower housing 22, for example.

[0043] like Figure 5 As shown, when viewed from the Z-axis direction, the first connecting member 6 is arranged between the lower shell 22 and the common decorative plate 5 in a manner such that at least a portion of the first connecting member 6 overlaps with the reinforcing member 4, thereby connecting the lower shell 22 and the common decorative plate 5. The first connecting member 6 is, for example, a cap-shaped member having a protrusion (first protrusion) 6a protruding toward the Z-axis positive side when viewed from the X-axis direction, as shown in FIG. Figure 7 As shown, it extends in the X-axis direction.

[0044] like Figure 5 As shown, the Z-axis-side end of the first connecting member 6 is fixed to the Z-axis-side surface of the recessed portion 5a of the common trim panel 5. This allows the first connecting member 6 to function as a reinforcement member for the common trim panel 5. Furthermore, the Z-axis-side end of the protruding portion 6a of the first connecting member 6 contacts the Z-axis-side surface of the housing portion 22a of the lower case 22.

[0045] Thus, when an impact is applied to the common trim panel 5 from the Z-axis side, the first connecting member 6 can prevent the impact from being transmitted to the recessed portion 5 a of the common trim panel 5 , thereby reducing the EA (Energy Absorption) stroke.

[0046] Therefore, when an impact is applied to the common trim panel 5, the space in the Z-axis direction where the common trim panel 5 deforms is smaller than in conventional power storage devices, contributing to a reduction in the size of the power storage device 1. Furthermore, the bending rigidity of the common trim panel 5 about the Y-axis can be increased, allowing the common trim panel 5 to be thinner. Consequently, the power storage device 1 can be made lighter.

[0047] Furthermore, when an impact is applied to the common trim panel 5 from the Z-axis side, the load caused by the impact can be dissipated to the reinforcing member 4 via the first connecting member 6. Therefore, unlike the common trim panels of conventional power storage devices, a rigid structure is not required, and the common trim panel 5 can be made thinner. Consequently, the power storage device 1 can be made lighter.

[0048] At this time, for example, bolts inserted through through-holes formed in the common trim panel 5, the first connecting member 6, and the lower case 22 can be screwed into weld nuts housed inside the reinforcing member 4 to secure the common trim panel 5 and the first connecting member 6 to the reinforcing member 4. This can suppress vibration of the common trim panel 5.

[0049] Moreover, for example, as shown in Figure 5 the width dimension W1 of the end portion of the protruding portion 6a in the first connecting member 6 on the +Z side in the Y-axis direction is equal to or greater than the width dimension W2 of the end portion of the protruding portion 4a in the reinforcing member 4 on the -Z side in the Y-axis direction. That is, the width dimensions W1 and W2 are lengths in the Y-axis direction orthogonal to the X-axis direction and the Z-axis direction. Thus, when an impact is applied to the common trim panel 5 from the -Z side, the load caused by the impact can be reliably released to the reinforcing member 4 via the first connecting member 6.

[0050] More preferably, for example, as shown in Figure 5 the width dimension W1 of the end portion of the protruding portion 6a in the first connecting member 6 on the +Z side in the Y-axis direction is equal to the width dimension W2 of the end portion of the protruding portion 4a in the reinforcing member 4 on the -Z side in the Y-axis direction.

[0051] At this time, as shown in Figure 5 from the Z-axis direction, substantially, the end portion of the protruding portion 6a in the first connecting member 6 on the +Y side overlaps the end portion of the protruding portion 4a in the reinforcing member 4 on the +Y side, and the end portion of the protruding portion 6a in the first connecting member 6 on the -Y side overlaps the end portion of the protruding portion 4a in the reinforcing member 4 on the -Y side.

[0052] Thus, from the Z-axis direction, the protruding portion 6a of the first connecting member 6 is disposed between the battery modules 2 adjacent in the Y-axis direction, and when an impact is applied to the common trim panel 5 from the -Z side, the first connecting member 6 can be prevented from colliding with the battery cell 10.

[0053] Further, the end portion of the protruding portion 6a in the first connecting member 6 on the +Z side can be in contact with the face of the receiving portion 22a of the lower case 22 on the -Z side via a second elastic member such as a foamed polyurethane sheet (not shown), or can be directly in contact with the face of the receiving portion 22a of the lower case 22 on the -Z side.

[0054] As shown in Figure 4 and Figure 6 the second connecting member 7 is disposed between the lower case 22 and the common trim panel 5 in such a manner that at least a portion of the second connecting member 7 overlaps the intermediate member 11 from the Z-axis direction, and connects the lower case 22 and the common trim panel 5.

[0055] For example, as shown in Figure 4 the second connecting member 7 has a cap shape having a protruding portion (second protruding portion) 7a protruding toward the +Z side from the X-axis direction. Moreover, as shown in Figure 7 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.

[0056] As shown in Figure 4As shown, the Z-axis-side end portion of the second connecting member 7 is fixed to the Z-axis-side surface of the recessed portion 5a of the common trim plate 5. Thus, the second connecting member 7 can also function as a reinforcing member of the common trim plate 5.

[0057] Moreover, if Figure 4 As shown, the end portion on the Z-axis + side of the protrusion 7a of the second connecting member 7 may contact the surface on the Z-axis - side of the housing portion 22a of the lower case 22 via a third elastic member 32 such as a foamed urethane sheet.

[0058] Therefore, when an impact is applied to the common trim panel 5 from the Z-axis side, not only the first connecting member 6 but also the second connecting member 7 can prevent the impact from being transmitted to the recessed portion 5 a of the common trim panel 5 , thereby further reducing the EA stroke.

[0059] Therefore, compared to conventional power storage devices, the space in the Z-axis direction required for deformation of the common trim panel 5 when an impact is applied thereto is smaller, contributing to a reduction in the size of the power storage device 1. Furthermore, the bending rigidity of the common trim panel 5 about the X-axis can be increased, allowing the common trim panel 5 to be thinner. Consequently, the power storage device 1 can be made lighter.

[0060] Furthermore, when an impact is applied to the common trim plate 5 from the Z-axis side, the load caused by the impact can be released to the intermediate member 11 via the second connecting member 7. Therefore, unlike common trim plates of conventional power storage devices, a rigid structure is not required, and the common trim plate 5 can be made thinner, resulting in a lighter power storage device 1.

[0061] Here, for example, Figure 4 As shown, the width W3 of the protrusion 7a of the second connecting member 7 on the Z-axis (+) side in the X-axis direction at the end is sufficient to be greater than the width W4 of the intermediate member 11 on the Z-axis (-) side in the X-axis direction. In other words, widths W3 and W4 are the lengths in the X-axis direction, which is perpendicular to the Y-axis and Z-axis directions. This ensures that if an impact is applied to the common trim panel 5 from the Z-axis (-) side, the resulting load is reliably dissipated to the intermediate member 11 via the second connecting member 7.

[0062] More preferably, for example, Figure 4 As shown, the width W3 of the Z-axis + side end portion of the protrusion 7 a of the second connecting member 7 in the X-axis direction is substantially equal to the width W4 of the Z-axis - side end portion of the intermediate member 11 in the X-axis direction.

[0063] At this time, if Figure 4As shown, from the Z-axis direction, the end of the protruding portion 7a of the 2nd connecting member 7 on the X-axis + side overlaps the end of the intermediate member 11 on the X-axis + side, and the end of the protruding portion 7a of the 2nd connecting member 7 on the X-axis - side overlaps the end of the intermediate member 11 on the X-axis - side.

[0064] Thus, from the Z-axis direction, the protruding portion 7a of the 2nd connecting member 7 is disposed between the battery cell groups 17 adjacent in the X-axis direction, and when an impact is applied to the common trim panel 5 from the Z-axis - side, the 2nd connecting member 7 can be prevented from colliding with the battery cell 10.

[0065] For example, as shown in FIG. 6, the protruding portion 4a of the reinforcing member 4 can be disposed so as to overlap the 2nd connecting member 7 from the Z-axis direction. Figures 4 to 6 As shown, for such a power storage device 1, the flange portion 21b of the upper case 21 and the flange portion 22b of the lower case 22 of the battery pack case 3 in the power storage device 1 can be fixed from below to the frame-shaped frame 101 in the vehicle 100.

[0066] Thus, the power storage device 1 of the present embodiment is provided with the 1st connecting member 6 that is disposed between the lower case 22 and the common trim panel 5 in such a manner that at least a portion thereof overlaps the reinforcing member 4 from the Z-axis direction, and connects the lower case 22 and the common trim panel 5.

[0067] Thus, when an impact is applied to the common trim panel 5 from the Z-axis - side, the impact can be prevented from being transmitted to the recessed portion 5a of the common trim panel 5 by the 1st connecting member 6, and thus the EA stroke can be reduced.

[0068] Therefore, compared to a general power storage device, the space in the Z-axis direction in which the common trim panel 5 deforms when an impact is applied thereto is small, and thus the power storage device 1 can be facilitated in size reduction. Also, the bending rigidity of the common trim panel 5 about the Y-axis can be increased, and thus the common trim panel 5 can be made thin. As a result, the power storage device 1 can be made light.

[0069] In addition, the load caused by the impact applied to the common trim panel 5 from the Z-axis - side can be released to the reinforcing member 4 via the 1st connecting member 6. Therefore, the common trim panel 5 does not need to be formed in a strong structure as in a general power storage device, and thus the common trim panel 5 can be made thin. As a result, the power storage device 1 can be made light.

[0070] Also, in the power storage device 1 of the present embodiment, from the X-axis direction, in the case where the intermediate member 11 protrudes to the Y-axis + side and the Y-axis - side with respect to the battery cell 10, when an impact is applied to the power storage device 1 from the Y-axis direction, the intermediate member 11 comes into contact with the protruding portion 4a of the reinforcing member 4 before the battery cell 10, and thus the damage to the battery cell 10 can be suppressed.

[0071] Further, in the power storage device 1 of the present embodiment, in the case where the common trim 5 is connected to the housing portion 22a of the lower case 22 via the second elastic member and the third elastic member 32, the common trim 5 can be reliably connected to the housing portion 22a of the lower case 22 via the second elastic member and the third elastic member 32, and thus the vibration of the common trim 5 can be suppressed.

[0072] Further, in the power storage device 1 of the present embodiment, in the case where the first elastic member 31 is disposed between the housing portion 22a of the lower case 22 and the intermediate member 11, the load caused by the impact applied to the common trim 5 from the Z-axis side can be reliably released to the intermediate member 11 via the second connecting member 7.

[0073] The present disclosure is not limited to the above-described embodiments, and can be appropriately changed without departing from the gist.

[0074] 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 configuration of the intermediate member 11, the first connecting member 6, and the second connecting member 7 can be appropriately changed according to the stacking direction of the battery cells 10.

[0075] For example, the first connecting member 6 and the second connecting member 7 of the above-described embodiments are substantially hat-shaped, but can be any shape that can transmit the load between the lower case 22 and the common trim 5. Further, any one of the first elastic member 31, the second elastic member, and the third elastic member 32 can be omitted.

[0076] For example, the first connecting member 6 and the second connecting member 7 of the above-described embodiments are fixed to the common trim 5, but can be fixed to the lower case 22, or can not be fixed to the lower case 22 and the common trim 5. In any case, the first connecting member 6 and the second connecting member 7 only need to connect the lower case 22 and the common trim 5 so that the load can be transmitted.

[0077] For example, the shape and the like of the intermediate member 11 and the second connecting member 7 of the above-described embodiments are examples, and can be any configuration that can release the load caused by the impact applied to the common trim 5 from the Z-axis side to the intermediate member 11 via the second connecting member 7. Further, in the above-described embodiments, the intermediate member 11 and the second connecting member 7 are provided, but the intermediate member 11 and the second connecting member 7 can be omitted.

[0078] In light of the above disclosure, it is apparent that the embodiments of the present disclosure are susceptible to variations in various ways. These variations should not be considered as departing from the gist and scope of the present disclosure, and all such modifications are obviously included within the scope of the technical solutions for those skilled in the art.

Claims

1. An electric storage device comprising: a first cover; a plurality of battery cells arranged above the first cover and having a pair of electrode terminals arranged on a pair of faces opposing each other in a first direction; a reinforcing member arranged below the electrode terminals and between the plurality of battery cells; and a second cover arranged below the first cover, wherein the electric storage device has a first connecting member arranged between the first cover and the second cover and connecting the first cover and the second cover, and at least a portion of the first connecting member overlaps the reinforcing member as viewed in an up-down direction.

2. The electric storage device according to claim 1, wherein the reinforcing member extends in a second direction orthogonal to the first direction and the up-down direction, the first connecting member extends in the second direction and has a first protruding portion protruding in the up-down direction, and a width dimension of the first protruding portion is equal to or greater than a width dimension of the reinforcing member.

3. The electric storage device according to claim 2, wherein an end portion of the first protruding portion in the first direction overlaps an end portion of the reinforcing member in the first direction as viewed in the up-down direction.

4. The electric storage device according to any one of claims 1 to 3, comprising an intermediate member arranged at least a portion between the battery cells arranged in a second direction orthogonal to the first direction and the up-down direction, the intermediate member protruding in the first direction with respect to the battery cells.

5. The electric storage device according to claim 4, comprising a second connecting member arranged between the first cover and the second cover and connecting the first cover and the second cover, and at least a portion of the second connecting member overlaps the intermediate member as viewed in the up-down direction.

6. The electric storage device according to claim 5, wherein the intermediate member extends in the first direction, the second connecting member extends in the first direction and has a second protruding portion protruding in the up-down direction, and a width dimension of the second protruding portion is equal to or greater than a width dimension of the intermediate member.

7. The electric storage device according to claim 6, wherein an end portion of the second protruding portion in the second direction overlaps an end portion of the intermediate member in the second direction as viewed in the up-down direction.

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

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