Power storage device

Abstract

To provide a power storage device that exhibits a current interruption function even when a short circuit is formed in a power storage unit.SOLUTION: The present invention relates to a power storage device 100 mounted on a vehicle. The power storage device 100 includes: a power storage unit 80; an inter-module fuse 70; a first external terminal 55a; and a second external terminal 55b. A power storage unit 81 contains a first power storage module 22 having a first electrode 3 and a second power storage module 23 having a second electrode 3. The first electrode 3 includes a first terminal 3a electrically connected to the first external terminal 55a and a second terminal 3b. The second electrode 3 includes: a third terminal 3b electrically connected to a second external terminal 55b; and a fourth terminal 3a, and the second terminal 3b and the fourth terminal 3a are electrically connected to each other. The inter-module fuse 70 is provided in an electrical path between the second terminal 3b and the fourth terminal 3a.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] For example, Japanese Patent Application Laid-Open Publication No. 2023-046977 (Patent Document 1) discloses a power storage device including an upper case, a lower case, and a power storage unit including multiple power storage modules. The power storage module includes multiple secondary battery cells with smoke exhaust ports and is housed in cases (upper and lower cases). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2023-046977 Summary of the Invention [Problem to be solved by the invention]

[0004] In the power storage device, from the viewpoint of electrical protection, it is conceivable to provide a fuse in the battery pack structure, for example.

[0005] For example, the fuse may be placed between the external terminal of the energy storage device and the energy storage module as a safety device to prevent a large current exceeding specifications from flowing through an electronic device connected to the energy storage device.

[0006] In the above-described power storage device, when the power storage module generates heat, emissions may be generated from the heated power storage module.

[0007] Then, there are cases where the emitted material from the heated power storage module causes a short circuit between the heated power storage module and an adjacent power storage module, resulting in the formation of a short circuit within the power storage unit.

[0008] On the other hand, since the fuse is provided between the external terminal and the power storage unit, it cannot perform its current interruption function even if a short circuit such as that described above is formed.

[0009] The present disclosure has been made in consideration of the above-mentioned problems, and its purpose is to provide an energy storage device that includes an energy storage unit including multiple energy storage modules, and that exhibits a current interruption function even if a short circuit is formed within the energy storage unit. [Means for solving the problem]

[0010] 1. An energy storage device mounted on a vehicle, the energy storage device comprising: an energy storage unit; an inter-module fuse; a first external terminal; and a second external terminal; the energy storage unit includes a first energy storage module having a first electrode; and a second energy storage module arranged adjacent to the first energy storage module in a width direction and having a second electrode; the first electrode is disposed at one end of the energy storage unit in the width direction; the first electrode includes a first terminal electrically connected to the first external terminal and a second terminal; the second electrode is disposed at the other end of the energy storage unit in the width direction; the second electrode includes a third terminal electrically connected to the second external terminal and a fourth terminal; the second terminal and the fourth terminal are electrically connected; and the inter-module fuse is provided in an electrical path between the second terminal and the fourth terminal.

[0011] The power storage device further includes a terminal fuse, the terminal fuse being provided in the electrical path between the second external terminal and the third terminal.

[0012] The energy storage device, wherein the energy storage unit includes a connecting bracket that connects the first energy storage module and the second energy storage module, and the connecting bracket is formed so as to protrude upward beyond the first energy storage module and the second energy storage module.

[0013] The energy storage device further includes a third energy storage module, the third energy storage module being arranged in an arrangement direction intersecting the width direction relative to the energy storage unit, the third energy storage module being arranged between one end and the other end in the width direction, and the inter-module fuse being arranged in a position adjacent to the third energy storage module in the width direction.

[0014] An electricity storage device, comprising a heat insulator disposed above a first fuse. The heat insulating material has an opening formed therein that communicates with the space inside the power storage device.

[0015] The power storage device further includes a lower case, and the first fuse is disposed on the lower case via a thermally conductive member. [Effects of the Invention]

[0016] According to the present disclosure, it is possible to provide an energy storage device that includes an energy storage unit including a plurality of energy storage modules, and that exhibits a current interruption function even if a short circuit is formed within the energy storage unit. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a plan view schematically showing an electricity storage device according to an embodiment of the present invention; [Figure 2] 1 is a perspective view schematically illustrating an electricity storage module according to an embodiment of the present invention. [Figure 3] FIG. 3 is an exploded perspective view of the power storage module shown in FIG. 2. [Figure 4] 1 is a side view schematically showing a storage cell according to an embodiment of the present invention; [Figure 5] FIG. 1 is a perspective view schematically illustrating an electricity storage unit according to an embodiment of the present invention. [Figure 6] FIG. 6 is an enlarged perspective view of the periphery of the connecting bracket shown in FIG. 5. [Figure 7] 7 shows a cross-sectional view taken along line VII-VII in FIG. [Figure 8]8 shows a cross-sectional view taken along the line VIII-VIII in FIG. [Figure 9] 9 shows a cross-sectional view taken along line IX-IX in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0018] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] The present disclosure will be described with reference to the accompanying drawings, in which the same or corresponding elements are designated by the same reference numerals.

[0019] FIG. 1 is a plan view showing a power storage device according to this embodiment. A length direction L, a width direction W, and a vertical direction H shown in FIG. 1 respectively indicate the length direction, width direction, and vertical direction of the power storage device. The power storage device 100 is, for example, a device for storing electric power for driving an electric vehicle (not shown). The width direction W is an example of a "first direction" in the present disclosure, and the length direction L is an example of a "second direction" in the present disclosure.

[0020] The energy storage device 100 includes a case 10, an energy storage assembly 90, a bus bar 40, a junction box 50, an external terminal 55, and an inter-module fuse 70.

[0021] The case 10 houses the power storage assembly 90, the junction box 50, the protective cover 60, and the inter-module fuse 70. The case 10 has a lower case 11 and an upper cover 12 (not shown). The case 10 forms the outer shell of the power storage device 100.

[0022] The lower case 11 is formed to open upward. The upper cover 12 is formed to have the same outer shape as the lower case 11 when viewed from a position away from the up-down direction H. The connection between the lower case 11 and the upper cover 12 forms a space R1.

[0023] Lower case 11 includes a bottom plate and peripheral walls extending upward from the outer periphery of the bottom plate. The peripheral walls include a front wall and a rear wall arranged in a length direction L, and a right side wall and a left side wall arranged in a width direction W.

[0024] The power storage assembly 90 includes a plurality of power storage units 80 and a power storage module 21. The multiple energy storage units 80 are arranged in a row in the length direction L. Each energy storage unit 80 includes one end surface and the other end surface arranged in the width direction W. Each of the multiple energy storage units 80 includes energy storage modules 20 arranged in the width direction W, and connecting brackets 30 that connect adjacent energy storage modules 20 in the width direction W.

[0025] The power storage module 21 is disposed adjacent to the plurality of power storage units 80 in the length direction L. For example, the power storage module 21 is provided on the rear side of the plurality of power storage units 80.

[0026] The power storage module 21 is disposed in the center of the power storage unit 80 in the width direction W. Therefore, the power storage module 21 is located between one end surface and the other end surface of the power storage unit 80 in the width direction W.

[0027] Accordingly, for example, a dead space is formed by the electricity storage unit 80 and the electricity storage module 21 at a position adjacent to the electricity storage module 21 in the width direction W.

[0028] The junction box 50 is provided at a position adjacent to the electricity storage assembly 90 in the longitudinal direction L. For example, the junction box 50 is disposed on the front side of the electricity storage assembly 90. The junction box 50 is disposed on the inner surface side of the front wall of the lower case 11.

[0029] The external terminal 55 is provided on the front wall of the lower case 11, and the external terminal 55 is provided on the outer surface of the front wall of the lower case 11.

[0030] The inter-module fuse 70 is arranged adjacent to the electricity storage module 21 in the width direction W.

[0031] The bus bars 40 connect the power storage modules 20 to each other and connect the power storage modules 20 to the inter-module fuses 70 .

[0032] The power storage device 100 is connected to a PCU (power control unit) of the electric vehicle or the like via a power line or the like connected to an external terminal 55.

[0033] FIG. 2 is a perspective view schematically illustrating the energy storage module according to this embodiment. The energy storage module 20 is a rectangular parallelepiped formed to extend in the width direction W. The energy storage module 20 includes a module case 2 and an electrode 3. The module case 2 has cutouts 2a and 2b at one end of a pair of walls arranged in the width direction W. The electrode 3 is composed of a terminal 3a and a terminal 3b. The terminal 3a is exposed from the cutout 2a of the module case 2, and the terminal 3b is exposed from the cutout 2b of the module case 2.

[0034] Fig. 3 shows an exploded perspective view of the power storage module 20 shown in Fig. 2. The power storage module 20 includes a plurality of power storage cells 1 housed in a module case 2.

[0035] FIG. 4 shows a side view of the energy storage cell. The energy storage cell 1 is formed to extend in the width direction W. The energy storage cell 1 has electrode terminals 1a and 1b at both ends in the width direction W. In the width direction W, the electrode terminal 1a is disposed at one end of the energy storage cell 1, and the electrode terminal 1b is disposed at the other end of the energy storage cell 1. For example, the electrode terminal 1a is a positive electrode terminal, and the electrode terminal 1b is a negative electrode terminal.

[0036] 3 again, the plurality of storage cells 1 are arranged in the length direction L. When the plurality of storage cells 1 are viewed from a position spaced apart from the storage cells 1 in the width direction W, the electrode terminals 1a and the electrode terminals 1b of the storage cells 1 are arranged alternately in the length direction L.

[0037] In the longitudinal direction L, one end of the arranged electrode terminals 1a, 1b is electrode terminal 1a, and the other end is electrode terminal 1b. The electrode terminals 1a and 1b of adjacent energy storage cells 1 are electrically connected in series by a bus bar 40. In the multiple energy storage cells 1 electrically connected in series, the electrode terminal 1a at one end of the conductive path corresponds to the terminal 3a of the energy storage module 20, and the electrode terminal 1b at the other end corresponds to the terminal 3b of the energy storage module 20.

[0038] The module case 2 has an upper frame 4, a lower frame 5, insulating covers 6a and 6b, and end plates 7.

[0039] The upper frame 4 is disposed so as to cover the plurality of energy storage cells 1 from above. A plurality of gas exhaust holes 4a are formed in the upper frame 4. Gas generated from the energy storage cells 1 is exhausted through the gas exhaust holes 4a.

[0040] The lower frame 5 is formed so as to cover the lower surfaces of the plurality of storage cells 1 and a pair of side surfaces arranged in the length direction L. The lower frame 5 supports the plurality of storage cells 1 from below. The lower frame 5 is formed so as to sandwich the plurality of storage cells 1 in the length direction L.

[0041] The pair of insulating covers 6a, 6b are arranged to sandwich the plurality of energy storage cells 1 in the width direction W.

[0042] The insulating cover 6a is disposed on the surface on which the electrode terminals 1a, 1b corresponding to the terminals 3a, 3b are provided in the width direction W. When the insulating cover 6a is viewed from a position away from the width direction W, the insulating cover 6a is formed to cover the multiple energy storage cells 1, and further has cutouts 2a formed therein so that the terminals 3a and 3b are exposed.

[0043] The insulating cover 6b is disposed in a position facing the insulating cover 6a, sandwiching the plurality of energy storage cells 1. The insulating cover 6b is formed so as to cover the plurality of energy storage cells 1 when viewed from a position away from the width direction W.

[0044] The end plate 7 is disposed adjacent to the insulating cover 6b in the width direction W. FIG. 5 shows a perspective view of the energy storage unit. The energy storage unit 80 has a pair of energy storage modules 20 and a connecting bracket 30. The energy storage modules 20 are arranged in the width direction W. The energy storage unit 80 is formed so that insulating covers 6a are arranged on both ends in the width direction W. As a result, in the energy storage unit 80, the end plates 7 of the pair of energy storage modules 20 are arranged so as to face each other. In the energy storage unit 80, the pair of energy storage modules 20 are connected by fastening the connecting bracket 30 to the pair of facing end plates 7.

[0045] FIG. 6 is an enlarged perspective view of a portion formed by a pair of end plates, a connecting bracket, and a bolt in FIG.

[0046] When viewed from a distance from the end plate 7 in the width direction W, the end plate 7 has notches 7a formed at the four corners of the end plate 7. The end plate 7 has through holes 7b formed therein so as to pass between the notches 7a arranged in the up-down direction H.

[0047] The connecting bracket 30 has an upper member 31 and a pair of lower members 34 . The upper member 31 is formed to extend in the longitudinal direction L. The upper member 31 is formed to cover the pair of end plates 7 of the electricity storage unit 80. The upper member 31 is formed from a top plate 32 and a pair of end members 33.

[0048] The top plate 32 is formed to extend in the length direction L. The top plate 32 is formed to cover the upper surface of the end plate 7.

[0049] The pair of end members 33 are arranged in the longitudinal direction L. The pair of end members 33 are connected by a top plate 32. The end members 33 are disposed on the upper surfaces of the cutout portions 7a of the pair of end plates 7. Two through holes 33a are formed in each of the pair of end members 33 so as to extend in the up-down direction H.

[0050] Each of the pair of lower members 34 is formed below the end member 33 so as to fit into the notch 7a of the end plate 7. Two female screw portions 34a are formed in the lower member 34 so as to extend in the up-down direction H. Threads are formed on the side surfaces of the holes that form the female screw portions 34a.

[0051] Fig. 7 is a cross-sectional view taken along line VII-VII in Fig. 1. The through-hole 7b of the end plate 7, the through-hole 33a of the end member 33, and the female screw portion 34a of the lower member 34 are formed coaxially.

[0052] The bolt 35 is formed of a bolt head 35a and a shaft 35b. The shaft 35b is inserted into a hole formed by the through holes 7b, 33a and the female thread portion 34a. The bolt 35 and the lower member 34 are fastened together with the upper member 31 and the end plate 7 sandwiched therebetween. As a result, the pair of end plates 7 are restrained by the connecting bracket 30.

[0053] The plurality of power storage modules 20 are supported from below by the lower case 11. The upper member 31 of the connecting bracket 30 and the end plate 7 are in contact with each other with no gap in the up-down direction H.

[0054] An upper surface 32a of the top plate 32 of the connecting bracket 30 is formed higher than an upper surface 4b of the upper frame 4. Similarly, an upper surface 33b of the end member 33 of the connecting bracket 30 is formed higher than an upper surface 4b of the upper frame 4. In other words, the upper surfaces 32a, 33b of the connecting bracket 30 protrude higher than an upper surface 4b of the power storage module 20. Furthermore, a heat insulating material 36 is arranged to fill the gap between the upper cover 12 and the top plate 32. Note that the heat insulating material 36 may be formed integrally with the top plate 32.

[0055] 1 again, the bus bar 40 electrically connects the junction box 50, the inter-module fuse 70, the energy storage assembly 90, and the external terminal 55 of the energy storage device 100. This forms an electrical path within the energy storage device 100 that terminates at the first external terminal 55a and the second external terminal 55b.

[0056] Specifically, the bus bar 40 electrically connects the energy storage units 80 arranged in the longitudinal direction L. More specifically, the bus bar 40 electrically connects the terminal 3 a of the energy storage module 20 constituting the energy storage unit 80 to the terminal 3 b of the energy storage module 20 adjacent to the terminal 3 a in the longitudinal direction L.

[0057] Of the plurality of power storage units 80 arranged in the length direction L, the power storage unit 81 located at one end is connected to the first external terminal 55a and the second external terminal 55b. The power storage unit 82 located at the other end is electrically connected to the power storage module 21.

[0058] More specifically, in the energy storage unit 81, the terminal 3a of one of the energy storage modules 22 arranged in the width direction W is electrically connected to the first external terminal 55a, and the terminal 3b of the other energy storage module 23 arranged in the width direction W is electrically connected to the second external terminal 55b.

[0059] Furthermore, in the energy storage unit 82 located at the other end, the terminal 3b of one energy storage module 24 in the width direction W is electrically connected to the terminal 3a of the energy storage module 21. The terminal 3a of the other energy storage module 25 in the width direction W is electrically connected to the terminal 3b of the energy storage module 21. As a result, the energy storage module 21 is provided on an electrical path formed by the electrical connection between the terminal 3b of the energy storage module 22 and the terminal 3a of the energy storage module 23.

[0060] The junction box 50 houses electrical devices such as the SMR and fuses of the power storage device 100. Inside the junction box 50, for example, a terminal fuse 51 is provided. The terminal fuse 51 is provided on an electrical path between the terminal 3b of the power storage module 23 of the power storage unit 81 and the second external terminal 55b. The terminal fuse 51 melts down when a large current flows in a state in which a drive system electronic device or the like is connected to the external terminal 55b to form a closed circuit.

[0061] The energy storage device 100 further includes a protective cover 60. The protective cover 60 is provided to prevent conductive foreign matter from adhering to the bus bar 40. The protective cover 60 is formed to extend in the length direction L. The protective covers 60 are arranged side by side in the width direction W. The protective cover 60 is arranged to cover the bus bar 40 that electrically connects the energy storage units 80 to each other.

[0062] The inter-module fuse 70 is provided on the electrical path between the terminal 3 b of the power storage module 21 and the terminal 3 a of the power storage module 25 .

[0063] FIG. 8 shows a cross-sectional view taken along line VIII-VIII in FIG. The inter-module fuse 70 is housed in a fuse case 71. The inter-module fuse 70 is fixed to the bottom surface of the fuse case 71.

[0064] The fuse case 71 is formed so as to surround the inter-module fuse 70 on all four sides. The fuse case 71 may be formed with ventilation holes (not shown) for allowing the inter-module fuse 70 to exchange heat with the air outside the fuse case 71. The fuse case 71 is disposed on the lower case 11 with a heat conductive member 72 sandwiched therebetween. The fuse case 71 has a fixing member 73 formed so as to extend from the fuse case 71. The fixing member 73 connects the fuse case 71 and a reinforcing member 11a fixed on the lower case 11. In this way, the fuse case 71 is fixed on the lower case 11.

[0065] Fig. 9 shows a cross-sectional view taken along line IX-IX in Fig. 1. A heat insulating material 74 is disposed above the fuse case 71. A cover 75 is disposed on top of the heat insulating material 74 so as to cover the heat insulating material 74. An opening 74a is formed in the heat insulating material 74.

[0066] The opening 74a communicates, in the width direction W, the space R2 in which the fuse case 71 is covered with the heat insulating material 74 with the space R1 formed by the lower case 11 and the upper cover 12.

[0067] The bus bar 40 connected to the inter-module fuse 70 is connected to the electrode 3 through the opening 74a.

[0068] In the above embodiment, the energy storage device 100 has the inter-module fuse 70 disposed on the electrical path between the energy storage module 24 and the energy storage module 25. With this configuration, even if the energy storage modules 20 adjacent to each other in the width direction W in the energy storage unit 80 become conductive and a short circuit occurs within the energy storage device 100, the inter-module fuse 70 melts, thereby making it possible to provide the energy storage device 100 that can cut off a large current.

[0069] In the above embodiment, the electricity storage unit 80 includes a connecting bracket 30. The upper member 31 of the connecting bracket 30 and the end plate 7 are in contact with each other with no gap in the up-down direction H. This configuration can prevent smoke discharged from the gas exhaust holes 4a of the upper frame 4 from passing between the upper member 31 and the end plate 7. This can prevent smoke from flowing in the width direction W in the electricity storage unit 80.

[0070] Furthermore, the upper surface 32a of the top plate 32 of the upper member 31 and the upper surface 33b of the end member 33 are located higher than the upper surface 4b of the upper frame 4. With this configuration, it is possible to prevent smoke discharged from the gas discharge holes 4a of the upper frame 4 from passing above the top plate 32 and the end member 33. This makes it possible to prevent the flow of smoke in the width direction W of the electricity storage unit 80.

[0071] In the above embodiment, the heat insulating material 36 is arranged so as to fill the gap between the upper cover 12 and the top plate 32. With this configuration, the flow of smoke in the width direction W in the electricity storage unit 80 can be suppressed.

[0072] In the above embodiment, the energy storage module 21 is arranged in the length direction L at one end of the plurality of energy storage units 80 arranged in the length direction L. The energy storage module 21 is also located between one end and the other end of the energy storage units 80 in the width direction W. Furthermore, the inter-module fuse 70 is arranged in a position adjacent to the energy storage module 21 in the width direction W. With this configuration, it is possible to effectively utilize dead space occurring in positions adjacent to the energy storage modules 21 in the width direction.

[0073] In the above embodiment, the heat insulating material 74 is disposed above the inter-module fuse 70. With this configuration, the inter-module fuse 70 can be protected from high-temperature exhaust smoke generated from the power storage module 20.

[0074] Furthermore, an opening 74a that connects the space R1 and the space R2 is formed in the heat insulating material 74. With this configuration, the cool air in the space R1 flows into the space R2 through the opening 74a, thereby cooling the inter-module fuse 70.

[0075] In the above embodiment, the inter-module fuse 70 is disposed on the fuse case 71. The fuse case 71 is disposed on the lower case 11 with a heat conductive member 72 sandwiched therebetween. The lower case 11 has a larger heat capacity than the fuse case 71. With this configuration, the heat of the inter-module fuse 70 can be dissipated to the lower case 11 via the fuse case 71 and the heat conductive member 72.

[0076] In the above embodiment, the gap between the upper cover 12 and the top plate 32 is filled with the insulating material 36, but the present disclosure is not limited to this. For example, there may be a gap between the upper cover 12 and the top plate 32 without the insulating material 36. Instead, the upper surface 32a of the top plate 32 and the upper surface 33b of the end member 33 are each formed to be located higher than the upper surface 4b of the upper frame 4 of the power storage module 20. With this configuration, it is possible to prevent smoke discharged from the gas exhaust hole 4a of the upper frame 4 from passing above the connecting bracket 30. This makes it possible to prevent the flow of smoke in the width direction W of the power storage unit 80.

[0077] The embodiments disclosed herein should be considered to be illustrative in all respects and not restrictive. The scope of the present disclosure is defined by the claims, not by the description of the above embodiments, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0078] 1 energy storage cell, 1a, 1b electrode terminal, 2 module case, 2a, 2b, 7a notch, 3 electrode, 3a, 3b terminal, 4 upper frame, 4a gas exhaust hole, 4b, 32a, 33b upper surface, 5 lower frame, 6a, 6b insulating cover, 7 end plate, 7b, 33a through hole, 10 case, 11 lower case, 11a reinforcing member, 12 upper cover, 20, 21, 22, 23, 24, 25 energy storage module, 30 connecting bracket, 31 upper member, 32 top plate, 33 end member, 34 lower member, 34a female thread portion, 35 bolt, 35a bolt head, 35b shaft portion, 36, 74 heat insulating material, 40 bus bar, 50 junction box, 51 terminal fuse, 55 external terminal, 55a First external terminal, 55b second external terminal, 60 protective cover, 70 inter-module fuse, 71 fuse case, 72 thermal conduction member, 73 fixing member, 74a opening, 75 cover, 80, 81, 82 energy storage unit, 90 energy storage assembly, 100 energy storage device, H vertical direction, L length direction, R1, R2 space, W width direction.

Claims

1. A power storage device mounted on a vehicle, the power storage device includes a power storage unit, an inter-module fuse, a first external terminal, and a second external terminal; the energy storage unit includes a first energy storage module having a first electrode, and a second energy storage module arranged adjacent to the first energy storage module in a first direction and having a second electrode; the first electrode is disposed at one end of the power storage unit in the first direction; the first electrode includes a first terminal electrically connected to the first external terminal and a second terminal; the second electrode is disposed at the other end of the power storage unit in the first direction, the second electrode includes a third terminal electrically connected to the second external terminal and a fourth terminal; the second terminal and the fourth terminal are electrically connected to each other, The inter-module fuse is provided in an electrical path between the second terminal and the fourth terminal.

2. The power storage device further includes a terminal fuse, The power storage device according to claim 1 , wherein the terminal fuse is provided in an electrical path between the second external terminal and the third terminal.

3. the energy storage unit includes a connecting bracket that connects the first energy storage module and the second energy storage module, 3. The energy storage device according to claim 1, wherein the connecting bracket is formed so as to protrude upward beyond the first energy storage module and the second energy storage module.

4. the power storage device further includes a third power storage module; the third power storage module is disposed in a second direction intersecting the first direction with respect to the power storage unit; the third power storage module is disposed between the one end and the other end in the first direction, The power storage device according to claim 1 , wherein the inter-module fuse is disposed adjacent to the third power storage module in the first direction.

5. The power storage device according to claim 1 , wherein a heat insulating material is disposed above the inter-module fuse.

6. The power storage device according to claim 5 , wherein the heat insulating material has an opening formed therein that communicates with an internal space of the power storage device.

7. The power storage device further includes a lower case, The power storage device according to claim 1 , wherein the inter-module fuse is disposed on the lower case via a thermally conductive member.

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