Electricity storage device

Abstract

The present invention suppresses an increase in production cost, and suppresses a deterioration in positional accuracy of components. A power storage device is provided with: a power storage module (14); a lower case (12) that houses the power storage module (14); and a positioning member (30) provided in a gap between the side surface of the power storage module (14) and the inner wall of the lower case (12), the positioning member (30) coming into contact with the side surface and the inner wall, and restricting the relative movement of the power storage module (14) within the lower case (12). The positioning member (30) is made of a thermally conductive material that is deformable according to the gap.

Description

TECHNICAL FIELD

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

[0002] For example, in Japanese Patent No. 4858660 (Patent Literature 1), an assembled structure of a secondary battery having a positioning pin is described. PRIOR ART DOCUMENTS PATENT LITERATURE

[0003] Patent Literature 1: Japanese Patent No. 4858660 SUMMARY PROBLEMS TO BE SOLVED BY THE INVENTION

[0004] In a case where the distance between components is narrow, or in a case where the components are easily moved before fastening, in order to avoid the generation of contact or contact-induced abnormal noise by the components after fastening, the components are sometimes assembled using a positioning pin, or a positioning structure is provided. However, if a positioning pin is used in a production process, a process of installing the positioning pin, a process of disassembling, a process for reuse, and the like are required, and thus there is a case where the production cost increases when fully automated, or the production cost increases due to the provision of a positioning structure for the purpose of positioning only.

[0005] The present disclosure was completed in order to solve the above-described problems, and aims to provide an electrical storage device that suppresses an increase in production cost and suppresses deterioration of the positional accuracy of components. TECHNICAL MEANS FOR SOLVING THE PROBLEMS

[0006] The electrical storage device according to an aspect of the present disclosure includes: an electrical storage module; a frame that houses the electrical storage module; and a positioning component that is provided to a gap between a side surface of the electrical storage module and an inner wall of the frame, that abuts against the side surface and the inner wall, respectively, and that restricts relative movement of the electrical storage module in the frame. The positioning component is composed of a material having thermal conductivity that can be deformed according to the gap.

[0007] Thus, the positioning of the electrical storage module in the frame can be performed without using a positioning pin. Furthermore, the heat of the electrical storage module can be dissipated to the frame via the positioning component, and thus the positioning component can have a function of improving cooling performance in addition to a function of positioning. Therefore, it is possible to suppress an increase in production cost and to suppress deterioration of the positional accuracy of components.

[0008] In the present embodiment, the positioning component is provided in a manner of sandwiching the electrical storage module in a predetermined direction, and restricts relative movement in the predetermined direction.

[0009] Thus, the heat of the electrical storage module can be dissipated to the frame via the positioning component while restricting the relative movement of the electrical storage module.

[0010] Moreover, in the present embodiment, the concave-convex portions that can be fitted are provided on the side surface of the electricity storage module and the contact surface of the positioning member that contacts the electricity storage module, respectively.

[0011] In this way, the electricity storage module and the positioning member can be assembled as one body to the frame, and thus the assembly can be improved.

[0012] Moreover, in the present embodiment, the frame includes an upper cover and a lower case. The positioning member is configured such that the upper end of the positioning member abuts against the upper cover.

[0013] In this way, in addition to the inner wall of the lower case, the heat of the electricity storage module can be dissipated to the frame via the positioning member with respect to the upper cover.

[0014] Moreover, in the present embodiment, the positioning member further includes a protruding portion that abuts against the upper surface of the electricity storage module.

[0015] In this way, the relative movement of the electricity storage module in the upward direction can also be restricted by the protruding portion of the positioning member, and thus the generation of abnormal noise and the like can be suppressed. Effects of Invention

[0016] According to the present disclosure, an electricity storage device that suppresses the increase in production cost and suppresses the deterioration of the positional accuracy of components can be provided. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a view that shows an example of the structure of the electricity storage device to which the present embodiment is applied. Figure 2 is a cross-sectional view for explaining an example of the positioning of the electricity storage module. Figure 3 is a cross-sectional view that shows an example of the structure of the electricity storage device to which the present embodiment is applied. Figure 4 is a cross-sectional view that shows an example of the structure of the electricity storage device to which the modification example is applied. Figure 5 is a cross-sectional view that shows another example of the structure of the electricity storage device to which the modification example is applied. DETAILED DESCRIPTION

[0018] Hereinafter, the embodiments of the present disclosure will be described in detail with reference to the drawings. Furthermore, the same reference numerals are assigned to the same or equivalent portions throughout the drawings, and the description thereof will not be repeated.

[0019] Figure 1 is a view that shows an example of the structure of the electricity storage device 10 to which the present embodiment is applied. Figure 1The diagram shows a view of the energy storage device 10 from above. The energy storage device 10 is, for example, mounted in an electric vehicle, such as a hybrid vehicle or an electric vehicle, which is driven by an electric motor. The energy storage device 10 has, for example, a cuboid shape and is mounted in the vehicle such that its length direction aligns with the width direction or the front-rear direction of the vehicle. The energy storage device 10 supplies power to the vehicle's electric motor or receives regenerative power from the electric motor and is charged.

[0020] like Figure 1 As shown, the energy storage device 10 includes an energy storage module 14, a lower housing 12, and positioning components 30, 32, 34, and 36.

[0021] The energy storage module 14 is configured, for example, by arranging and connecting multiple battery cells in a predetermined direction. Alternatively, the energy storage module 14 may also be configured, for example, by connecting multiple battery cell groups with two or more battery cells connected in parallel in series.

[0022] The battery cell is, for example, a secondary battery such as a nickel-metal hydride battery or a lithium-ion battery. The battery cell can have a liquid electrolyte or a solid electrolyte. Furthermore, the battery cell can have a polygonal cylindrical shape or a cylindrical shape. Moreover, the energy storage device 10 can also be constructed using one or more capacitors capable of charging and discharging, instead of a battery cell.

[0023] The energy storage module 14 is housed within the lower housing 12. The frame is formed by the lower housing 12 and the upper cover (not shown), described later. The energy storage module 14 is installed through an opening at the top of the lower housing 12 and is positioned on the bottom surface of the lower housing 12. Along the vertical direction (… Figure 1 Bolt holes 16 are formed on the paper surface (near the front-to-depth direction). Bolt holes 16 can also be provided, for example, on the end plate of the energy storage module 14. The energy storage module 14 is fixed to the bottom surface of the lower housing 12 by passing bolts through the bolt holes 16 and tightening them to nuts fixed to the bottom surface of the lower housing 12. Bolt holes 16 are provided at multiple locations on the energy storage module 14. Figure 1 As an example, this example shows a case where the energy storage module 14 has six bolt holes 16, 18, 20, 22, 24, and 26, and nuts are fixed to the corresponding six locations on the lower housing 12. Multiple fixing points are acceptable, and there is no particular limitation to six. The top cover is designed to close the opening of the lower housing 12 where the energy storage module 14 is fixed.

[0024] In this case, when the positional accuracy between the components deteriorates in the case where the distance between the lower case 12 and the power storage module 14 is narrow, the components sometimes come into contact with each other to generate a noise when the vehicle is vibrated. Also, in the case where the heat-conducting material composed of a silicon-based adhesive or the like is provided between the lower case 12 and the power storage module 14, a positional deviation sometimes occurs between the power storage module 14 and the lower case 12 during a period from when the power storage module 14 is mounted on the lower case 12 to when the power storage module 14 is fastened and coupled to the lower case 12. In order to suppress such deterioration of the positional accuracy and occurrence of the positional deviation, for example, it is considered to assemble the power storage module 14 to the lower case 12 using a positioning pin.

[0025] Hereinafter, an example of positioning of the power storage module 14 relative to the lower case 12 using the positioning pin will be described. Figure 2 is a cross-sectional view for explaining an example of positioning of the power storage module 14. Figure 2 is a view showing a cross section of an A-A surface corresponding to Figure 1

[0026] As shown in Figure 2 , a heat-conducting material 50 is provided between the bottom surface of the lower case 12 and the power storage module 14. In addition, a cooler 60 is provided below the lower case 12. The cooler 60 is composed of, for example, a refrigerant circulation, and is configured to be capable of performing heat exchange with the power storage module 14 via the lower case 12 and the heat-conducting material 50.

[0027] The nut 46 is fixed to the base member 13 by welding or the like. The base member 13 is fixed to the bottom surface of the lower case 12 by welding or the like. The positioning pin 48 is installed in the nut 46. The shape of the base member 13 is only required to be such that the nut 46 can be fastened with the bolt inserted from above when the base member 13 is fixed to the bottom surface of the lower case 12, and is not particularly limited to the shape shown in Figure 2 . The nut 46 can also be directly fixed to the lower case 12 by welding or the like.

[0028] Further, the positioning pin 48 can be installed in the nut at a position corresponding to each of the bolt holes 16, 18, 20, 22, 24, 26, or can be installed in the nut at at least two positions. Thereafter, the heat-conducting material 50 is provided to the bottom surface of the lower case 12. Also, the power storage module 14 is mounted to the lower case 12 in such a manner that the positioning pin 48 is inserted into the bolt hole 16 of the power storage module 14. Thereafter, the positioning pin 48 is removed, and the bolts are passed through the bolt holes 16, 18, 20, 22, 24, 26. The power storage module 14 is fixed to the lower case 12 by fastening the bolts to the nuts 46.

[0029] ​However, if the positioning pin 48 is used in the production process of the power storage device 10, a process of installing the positioning pin 48, a process of removing the positioning pin 48, a process for recycling, and the like are required, and thus there is a case where the production cost increases when fully automated. Alternatively, instead of the positioning pin 48, a configuration for positioning can be provided in the lower case 12 and the power storage module 14, but the production cost can increase due to the provision of the positioning configuration for the purpose of positioning only.

[0030] Therefore, in the present embodiment, a positioning member is provided in a gap between a side surface of the power storage module 14 and an inner wall of the lower case 12 included in the frame, and abuts against the side surface of the power storage module 14 and the inner wall of the lower case 12, respectively, to restrict the relative movement of the power storage module 14 in the frame. The positioning member is composed of a material having thermal conductivity that can deform according to the gap between the side surface of the power storage module 14 and the inner wall of the frame.

[0031] Thus, the positioning of the power storage module 14 in the frame can be performed without using the positioning pin. Furthermore, since the heat of the power storage module 14 can be dissipated to the frame via the positioning member, the positioning member can have a function of improving the cooling performance in addition to the function of positioning. Therefore, the increase in the production cost can be suppressed, and the deterioration of the positional accuracy of the components can be suppressed.

[0032] Figure 3 is a cross-sectional view showing an example of the structure of the power storage device 10 according to the present embodiment. In Figure 3 is a cross-sectional view showing the A-A surface of Figure 1 . As shown in Figure 3 , the power storage device 10 according to the present embodiment is configured to include the positioning members 30, 32, 34, and 36 shown in Figure 1

[0033] As shown in Figure 3 , the positioning member 30 is provided in a gap between a side surface of the power storage module 14 and an inner wall of the lower case 12 included in the frame. The positioning member 30 is formed so as to fill the gap, and abuts against the side surface of the power storage module 14 and the inner wall of the lower case 12, respectively. The positioning member 30 restricts the relative movement of the power storage module 14 in the lower case 12 by the opposing positioning member 32. In the present embodiment, the positioning member 30 corresponds to a "first member", and the positioning member 32 corresponds to a "second member". The positioning member 30 is composed of a material having thermal conductivity that can deform according to the gap between the side surface and the inner wall. As the material constituting the positioning member 30, for example, a resin member or an elastic member such as rubber can be used. Furthermore, as shown in Figure 1 , the positioning member 30 is continuously formed in a predetermined length along the side surface of the power storage module 14.

[0034] ​A heat-conducting material 50 is disposed between the energy storage module 14 and the lower housing 12. The heat-conducting material 50 is applied, for example, before the energy storage module 14 is installed on the lower housing 12. The heat-conducting material 50 is, for example, composed of a silicon-based adhesive with high thermal conductivity. A cooler 60 is disposed below the lower housing 12. The heat generated in the energy storage module 14 exchanges heat with the cooler 60 via the lower housing 12 and the heat-conducting material 50. Thus, the energy storage module 14 is cooled.

[0035] Positioning components 32, 34, and 36 are configured similarly to positioning component 30. Therefore, the energy storage module 14 is positioned in a predetermined first direction ( Figure 1 The battery module 14 is clamped by positioning components 30 and 32 in the horizontal direction of the paper. That is, positioning components 30 and 32 restrict the relative movement of the battery module 14 relative to the lower housing 12 in a first direction. Similarly, the battery module 14 is positioned in a predetermined second direction (…). Figure 1 The battery module 14 is clamped by positioning components 34 and 35 along the longitudinal direction of the paper. That is, positioning components 34 and 36 restrict the relative movement of the battery module 14 with respect to the lower housing 12 in the second direction.

[0036] Moreover, such as Figure 3 As shown, the side of the energy storage module 14 and the contact surface of the positioning component 30 with the energy storage module 14 are respectively provided with fitting protrusions and recesses. More specifically, as shown... Figure 3 As shown, a protrusion 15 protruding towards the inner wall of the lower housing 12 is formed on the side of the energy storage module 14. Additionally, a recess 31 is formed on the contact surface of the positioning member 30 with the energy storage module 14, allowing the protrusion 15 to engage. By engaging the protrusion 15 on the side of the energy storage module 14 with the recess 31 of the positioning member, the energy storage module 14 and the positioning member 30 can move integrally. Positioning members 32, 34, and 36 are mounted on the energy storage module 14 in a manner that allows for integral movement, using the same construction. Positioning members 30, 32, 34, and 36 are housed in the lower housing 12 in a state where they are mounted on the energy storage module 14. With this structure, the relative movement of the energy storage module 14 relative to the lower housing 12 is restricted by the positioning members 30, 32, 34, and 36. In this state, bolts 44 are inserted into bolt holes 16, 18, 20, 22, 24, and 26 respectively, and tightened with nuts 46, thereby fixing the energy storage module 14 to the lower housing 12.

[0037] The operation of the power storage device 10 having the above-described structure will be described. The protruding portions of the side surfaces of the power storage modules 14 are fitted into the recesses of the positioning members 30, 32, 34, 36. Thus, the power storage modules 14 and the positioning members 30, 32, 34, 36 can move integrally. The bottom surface of the lower case 12 is previously coated with the heat-conducting material 50. When the power storage modules 14 and the positioning members 30, 32, 34, 36 are attached from the opening portion of the lower case 12, the positioning members 30, 32, 34, 36 come into abutment with the side surfaces of the power storage modules 14 and the inner walls of the lower case 12, respectively, and restrict the relative movement of the power storage modules 14 with respect to the lower case 12. Thus, the positional deviation of the power storage modules 14 after the assembly into the lower case 12 is suppressed. In this state, the bolts 44 are inserted into the bolt holes 16, 18, 20, 22, 24, 26, respectively, and are fastened to the corresponding nuts 46, respectively, thereby fixing the power storage modules 14 to the lower case 12.

[0038] With this structure, no jig such as a positioning pin is required, and thus the process of attaching the positioning pin to the nut 46 and the process of detaching the positioning pin from the nut 46 are not required, and the production process can be simplified.

[0039] Further, for example, the heat generated in the power storage modules 14 by the exchange of electric power with the electric motor that drives the vehicle is transferred to the lower case 12 via the heat-conducting material 50 and is transferred to the lower case 12 via the positioning members 30, 32, 34, 36. The heat transferred to the lower case 12 is dissipated in the cooler 60, and thus the power storage modules 14 are cooled. In this way, the heat dissipation of the power storage modules 14 is assisted by the positioning members 30, 32, 34, 36, and thus the improvement of the battery performance can be achieved.

[0040] As described above, according to the power storage device 10 according to the present embodiment, the positioning of the power storage modules 14 in the lower case 12 included in the frame can be performed without using a positioning pin. Further, since the heat of the power storage modules 14 can be dissipated to the frame via the positioning members 30, 32, 34, 36, the positioning members 30, 32, 34, 36 have not only the function of positioning but also the function of improving the cooling performance with respect to the positioning members 30, 32, 34, 36. In this way, by providing the positioning members 30, 32, 34, 36 with multiple functions, the increase in the production cost can be suppressed. Thus, a power storage device that suppresses the increase in the production cost and suppresses the deterioration of the positional accuracy of the components can be provided.

[0041] Further, since the positioning members 30, 32, 34, 36 come into abutment with the side surfaces of the power storage modules 14 and the inner walls of the lower case 12, respectively, the noise caused by the repeated contact and separation of the components due to the vibration and the like generated during the driving of the vehicle can be suppressed.

[0042] Since the positioning pin is not required, the process of installing the positioning pin, the process of disassembly, the process for reuse, and the like are not required, and thus the increase in production cost can be suppressed.

[0043] Further, since the relative movement of the electricity storage module 14 within the frame including the lower case is suppressed, for example, even in the case where a collision or the like occurs during the driving of the vehicle, the impact can be mitigated by the positioning members 30, 32, 34, 36, and the inertia generated in the electricity storage module 14 is reduced.

[0044] Hereinafter, a modification will be described. In the above-described embodiment, the structure in which the positioning members 30, 32, 34, 36 abut against the lower case 12 is described as an example, but is not particularly limited to such a structure. The positioning members 30, 32, 34, 36 may, for example, be a structure in which the positioning members 30, 32, 34, 36 abut against the upper cover in addition to the lower case 12. Further, a heat conduction material can be provided between the lower side of the positioning members 30, 32, 34, 36 and the lower case 12.

[0045] Figure 4 is a cross-sectional view that shows an example of the structure of the electricity storage device 10 to which the modification is applied. Figure 4 shows the cross section of the A-A face of Figure 1 . Figure 4 The electricity storage device 10 shown in Figure 3 is different from the electricity storage device 10 shown in Figure 3 in that the upper cover 70 is illustrated, in that the positioning member 38 is included instead of the positioning member 30, and in that the heat conduction material 52 is provided in addition to the heat conduction material 50 provided to the lower case 12. As for the structure other than this, the same structure as the electricity storage device 10 shown in

[0046] As shown in Figure 4 , the positioning member 38 is different from the positioning member 30 in that the positioning member 38 has a shape that protrudes upward more than the upper surface of the electricity storage module 14 and reaches a position at which the positioning member 38 abuts against the upper cover 70. The upper surface of the positioning member 38 is formed along the shape of the upper cover 70 over the entire surface. Further, a heat conduction material 52 is provided between the lower side of the positioning member 38 and the lower case 12. The heat conduction material 52 is composed of a silicon-based adhesive like the heat conduction material 50.

[0047] Further, the shape of the upper surface of the other positioning members corresponding to the positioning members 32, 34, 36, which is above the upper surface of the battery module 14, has a shape in which the entire surface of the upper surface abuts against the upper cover 70, like the positioning member 38. Therefore, the detailed description thereof will not be repeated. Also, the same heat-conducting material 52 as that applied to the lower surface of the lower case 12 is applied to the lower surface of the other positioning members corresponding to the positioning members 32, 34, 36.

[0048] With such a configuration, when the upper cover 70 is installed in a manner to close the opening of the upper portion of the lower case 12, the entire surface of the upper surface portion of the four positioning members abuts against the upper cover 70, while the battery module 14, which has the four positioning members including the positioning member 38, is housed in the lower case 12. Also, the lower surface of the four positioning members abuts against the heat-conducting material 52 applied to the lower case 12. Therefore, the heat generated in the battery module 14 is also transferred from the four positioning members to the upper cover 70 and the heat-conducting material 52. Thus, the heat transfer path is increased, and the cooling performance of the battery module 14 can be further improved.

[0049] The positioning member 38 can also have a configuration to restrict the relative movement in the vertical direction of the battery module 14.

[0050] Figure 5 is a cross-sectional view showing another example of the configuration of the power storage device 10 involved in the modification. Figure 5 shows the configuration of the power storage device 10 in Figure 1 is a view of the section corresponding to the A-A face of Figure 5 the power storage device 10 shown in Figure 4 is different from the power storage device 10 shown in Figure 4 in that the positioning member 40 is included instead of the positioning member 38. As for the configuration other than this, the same configuration as that of the power storage device 10 shown in

[0051] As shown in Figure 5 , the positioning member 40 is provided with a protruding portion 42 that abuts against the upper surface of the battery module 14 from above the upper surface of the battery module 14, compared to the positioning member 38. The protruding portion 42 is, for example, provided protruding from the contact surface of the positioning member 40 with the battery module 14 in the right angle direction (the left direction of the paper face) of the positioning member 40. Figure 5 The protruding portion 42 can be continuously formed along the end portion of the upper surface of the battery module 14, or a plurality of protruding portions 42 of a predetermined length can be provided at a predetermined interval. In addition, for example, as shown in Figure 5The protrusion 42 can also be formed to the position where it abuts against the lower surface of the upper cover 70, as indicated by the dotted line. Further, the shapes of the upper surfaces of the other positioning members corresponding to the positioning members 32, 34, 36, which are located higher than the battery module 14, have the same shape as the positioning member 40. Therefore, detailed description thereof will not be repeated.

[0052] In this way, by the four positioning members, the relative movement of the battery module 14 with respect to the frame (the upper cover 70 and the lower case 12) in the vertical direction, in addition to the horizontal direction, can be restricted.

[0053] Further, in the above-described embodiment, the case where the battery module 14 has a rectangular shape is described as an example, but the rectangular shape is not particularly limited. In particular, the case where the opposed end surfaces have a parallel relationship is not particularly limited, and further, the case where the end surfaces of the battery module 14 are not particularly limited to a flat surface, but can be a curved surface.

[0054] Further, in the above-described embodiment, the case where the protrusion 15 is provided to the battery module 14 and the recess 31 is provided to the positioning member 30 is described as an example, but a recess can be provided to the battery module 14 and a protrusion capable of fitting into the recess can be provided to the positioning member 30.

[0055] Further, in the above-described embodiment, the case where the positioning members are continuously formed along the side surfaces of the battery modules 14 is described as an example, but the positioning members can be provided at a plurality of positions (for example, two positions) spaced apart by a predetermined distance along the side surfaces.

[0056] Further, in the above-described embodiment, the case where the positioning members are formed of, for example, resin, rubber, or the like is described as an example, but the positioning members can be formed by, for example, adhering an insulating member to a metal such as aluminum or the like.

[0057] Further, in the above-described embodiment, the case where the positioning members 30, 32, 34, 36 abut against the lower case 12 and the battery module 14, respectively, is described as an example, but a heat-conducting material can be applied to at least either of the positioning members 30, 32, 34, 36 and the lower case 12, and further, a heat-conducting material can be applied to at least either of the positioning members 30, 32, 34, 36 and the battery module 14.

[0058] Moreover, in the above-described embodiment, a structure in which the recessed and protruding portions that can be fitted are provided on the side surface of the electricity storage module 14 and the contact surface of the positioning member 30 that contacts the electricity storage module 14, respectively, is described as an example, but a plurality of protruding portions can be provided on the side surface of the electricity storage module 14, a plurality of recessed portions that can be fitted with the plurality of protruding portions can be provided on the contact surface of the positioning member 30 that contacts the electricity storage module 14, or a protruding portion and a recessed portion can be provided on the side surface of the electricity storage module 14, and a recessed portion that can be fitted with the protruding portion of the electricity storage module 14 and a protruding portion that can be fitted with the recessed portion of the electricity storage module 14 can be provided on the contact surface of the positioning member 30 that contacts the electricity storage module 14.

[0059] Further, the above-described modified examples can be implemented by appropriately combining all or a part thereof. It should be considered that the embodiments disclosed this time are illustrative in all respects but not restrictive. The scope of the present application is not represented by the above-described description but by the claims, and it is intended to include all modifications within the meaning and scope equivalent to the claims. Explanation of Reference Numerals

[0060] 10 electricity storage device 12 lower case 13 base member 14 electricity storage module 15, 42 protruding portion 16, 18, 20, 22, 24, 26 bolt hole 30, 32, 34, 36, 38, 40 positioning member 31 recessed portion 44 bolt 46 nut 48 positioning pin 50, 52 heat-conducting material 60 cooler 70 upper cover

Claims

1. An electric power storage device, comprising: an electric power storage module; a housing that houses the electric power storage module; and a positioning member provided to a gap between a side surface of the electric power storage module and an inner wall of the housing, which abuts against the side surface and the inner wall, respectively, to restrict relative movement of the electric power storage module in the housing, the positioning member being composed of a material having thermal conductivity that is deformable according to the gap.

2. The power storage device according to claim 1, wherein The positioning member includes first and second members that are provided to sandwich the electric power storage module in a predetermined direction to restrict the relative movement in the predetermined direction.

3. The power storage device according to claim 1, wherein Rough and smooth portions that can be fitted into each other are provided to the side surface of the electric power storage module and a contact surface of the positioning member that contacts the electric power storage module, respectively.

4. The power storage device according to claim 1, wherein The housing includes an upper cover and a lower case, and the positioning member is configured such that an upper end of the positioning member abuts against the upper cover.

5. The power storage device according to claim 4, wherein The positioning member further includes a protruding portion that abuts against an upper surface of the electric power storage module.

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