JP2019204666A - Power storage device - Google Patents

Abstract

To provide a power storage device capable of preventing wrong assembly of power storage modules.SOLUTION: A power storage device 1 comprises a plurality of laminated power storage modules 4, and a conductive plate 5 interposed between adjoining power storage modules 4 and 4, and electrically connecting the adjoining power storage modules 4 and 4. The power storage module 4 has an electrode laminate 11 laminating a plurality of bipolar electrodes 14, and an encapsulation body 12 provided on the lateral face 11a of the electrode laminate 11 in frame-shape, and encapsulating between adjoining bipolar electrodes 14 and 14. The encapsulation body 12 of one of the adjoining power storage modules 4 is provided with a projection 24 projecting to the encapsulation body 12 side of the other of the adjoining power storage modules 4, and the encapsulation body 12 of the other power storage module 4 is provided with a recess 25 corresponding to the projection 24. The projection 24 is located in the recess 25.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a power storage device.

  2. Description of the Related Art Conventionally, a so-called bipolar power storage module including a bipolar electrode in which a positive electrode is provided on one surface of an electrode plate and a negative electrode is provided on the other surface is known (see Patent Document 1). Such a power storage module includes an electrode stack in which a plurality of bipolar electrodes are stacked. A sealing body that seals between adjacent bipolar electrodes is provided on a side surface of the electrode stack.

JP 2011-204386 A

  It is conceivable to configure a power storage device by stacking a plurality of power storage modules as described above with a conductive member interposed therebetween. In this case, it is necessary to stack each power storage module in the correct direction so that the plurality of power storage modules are electrically connected in series, but in such a process, the power storage module is assembled in the wrong direction. Misassembly may occur.

  Then, an object of this invention is to provide the electrical storage apparatus which can prevent the incorrect assembly | attachment of electrical storage modules.

  A power storage device according to one aspect of the present invention includes a plurality of stacked power storage modules, and a conductive member that is interposed between adjacent power storage modules and electrically connects adjacent power storage modules. An electrode laminate in which a plurality of bipolar electrodes are laminated, and a sealing body that is provided on a side surface of the electrode laminate and has a frame shape and seals between adjacent bipolar electrodes. The sealing body of the power storage module is provided with a protruding portion that protrudes toward the sealing body side of the other adjacent power storage module, and the sealing body of the other power storage module is provided with a recess corresponding to the protruding portion. And the protrusion is located in the recess.

  In this power storage device, the sealing body of one adjacent power storage module is provided with a protruding portion that protrudes toward the sealing body side of the other adjacent power storage module. A recess corresponding to the protruding portion is provided. And the protrusion part is located in a recessed part. Accordingly, for example, when one power storage module is stacked in the opposite direction with respect to another power storage module, the projecting portions interfere with each other, so that it is possible to prevent the power storage modules from being assembled in the wrong direction. . Therefore, according to this power storage device, it is possible to prevent erroneous assembly of the power storage modules.

  In at least one direction orthogonal to the stacking direction of the power storage modules, the clearance between the protruding portion and the inner surface of the recess may be smaller than the allowable amount of misalignment between the adjacent power storage modules. In this case, it is possible to position adjacent power storage modules in a direction orthogonal to the stacking direction by disposing the protrusions in the recesses.

  A plurality of protrusions and recesses are provided, and the plurality of protrusions may include at least a pair of protrusions having different shapes. In this case, it is possible to prevent the storage modules from being assembled while the angle around the axis along the stacking direction remains incorrect.

  The conductive member is provided with a flow path extending along a predetermined direction orthogonal to the stacking direction of the power storage modules, and the projecting portion is in a direction orthogonal to both the stacking direction and the predetermined direction in the sealing body. You may be provided in parts other than the side part extended along. In this case, for example, when the refrigerant is circulated in the flow path, it is possible to prevent the refrigerant from being interrupted by the protruding portion, and the refrigerant can be circulated effectively.

  The sealing body has a rectangular frame shape, and the protrusions may be provided at each of the four corners of the sealing body when viewed from the stacking direction of the power storage modules. In this case, for example, when a component such as a safety valve is attached to the sealing body, it is possible to suppress the protrusion from interfering with the component, and to ensure a degree of freedom in design.

  The sealing body has a plurality of primary sealing bodies provided respectively on the edges of the plurality of bipolar electrodes, and a secondary sealing body surrounding the plurality of primary sealing bodies from the outside, and a protruding portion and The concave portion may be provided in the secondary sealing body. In this case, the gap between adjacent bipolar electrodes can be reliably sealed by the sealing body.

  The sealing body may be a resin injection molded body. In this case, in the configuration in which the sealing body is a resin injection molded body, it is possible to prevent erroneous assembly of the power storage modules.

  According to the present invention, it is possible to prevent erroneous assembly between power storage modules.

It is sectional drawing which shows the electrical storage apparatus which concerns on one Embodiment. It is sectional drawing which shows the electrical storage module shown by FIG. It is a perspective view which shows an electrical storage module. It is a perspective view which expands and shows a part of electrical storage module. It is a perspective view which shows the state in which the some electrical storage module was laminated | stacked.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In the following description, the same reference numerals are used for the same or corresponding elements, and duplicate descriptions are omitted.
[Configuration of power storage device]

  The power storage device 1 shown in FIG. 1 is used as a battery for various vehicles such as forklifts, hybrid vehicles, and electric vehicles. The power storage device 1 includes a power storage module stack 2 and a restraining member 3.

  The power storage module laminate 2 includes a plurality (three in the present embodiment) of power storage modules 4 and a plurality (four in the present embodiment) of conductive plates (conductive members) 5. The plurality of power storage modules 4 are stacked along a predetermined stacking direction D1. The power storage module 4 is a bipolar battery including a bipolar electrode 14 described later. The power storage module 4 has, for example, a rectangular shape when viewed from the stacking direction D1. The power storage module 4 is, for example, a secondary battery such as a nickel hydride secondary battery or a lithium ion secondary battery, or an electric double layer capacitor. In the following description, a case where the power storage module 4 is a nickel metal hydride secondary battery will be exemplified.

  The plurality of conductive plates 5 include the conductive plates 5 arranged between the power storage modules 4 and 4 adjacent in the stacking direction D1. These conductive plates 5 are interposed between the power storage modules 4 and 4 adjacent in the stacking direction D1, and electrically connect the power storage modules 4 and 4 adjacent in the stacking direction D1. Thereby, the some electrical storage module 4 is electrically connected in series.

  The plurality of conductive plates 5 further include conductive plates 5 arranged on both sides of the plurality of power storage modules 4 in the stacking direction D1. A positive electrode terminal 6 is electrically connected to the conductive plate 5 arranged on one side in the stacking direction D1 with respect to the plurality of power storage modules 4. A negative electrode terminal 7 is electrically connected to the conductive plate 5 disposed on the other side in the stacking direction D1 with respect to the plurality of power storage modules 4. For example, the positive electrode terminal 6 and the negative electrode terminal 7 are drawn from the edge of the conductive plate 5 in a direction orthogonal to the stacking direction D1. The power storage device 1 is charged and discharged by the positive electrode terminal 6 and the negative electrode terminal 7.

  Inside each conductive plate 5, a plurality of flow paths 5a for circulating a refrigerant such as air are provided. Each flow path 5a extends, for example, along the stacking direction D1 and the flow direction (predetermined direction) D3 orthogonal to the lead-out direction D2 from which the positive electrode terminal 6 and the negative electrode terminal 7 are drawn. In other words, each flow path 5a penetrates the conductive plate 5 along the flow direction D3. By causing the refrigerant to flow through these flow paths 5a, the conductive plate 5 functions as a connecting member that electrically connects the power storage modules 4 and 4, and also dissipates heat generated by the power storage module 4. Also has a function as a member. For example, the conductive plate 5 is disposed on the inner side of the outer edge of the power storage module 4 when viewed from the stacking direction D1.

  The restraining member 3 includes a pair of end plates 8A and 8B that sandwich the power storage module stack 2 in the stacking direction D1, applies a restraining load to the power storage module stack 2, and a fastening bolt B that fastens the end plates 8A and 8B together. Nut N. Each end plate 8A, 8B is formed in a rectangular shape by, for example, metal. When viewed from the stacking direction D <b> 1, the outer edges of the end plates 8 </ b> A and 8 </ b> B are located outside the outer edge of the power storage module 4.

  Each end plate 8 </ b> A, 8 </ b> B is provided with an insertion hole 8 a in a portion located outside the power storage module stack 2 when viewed from the stacking direction D <b> 1. The fastening bolt B is passed from the insertion hole 8a of the other end plate 8B in the stacking direction D1 toward the insertion hole 8a of the one end plate 8A. A nut N is screwed onto the tip of the fastening bolt B protruding from the insertion hole 8a of the end plate 8A. As a result, the power storage module 4 and the conductive plate 5 are sandwiched between the end plates 8A and 8B to be unitized as the power storage module stack 2, and a restraining load is applied to the power storage module stack 2 in the stacking direction D1. Yes.

The power storage device 1 further includes a pair of insulating members 9 interposed between the end plates 8A and 8B and the conductive plates 5 adjacent to the end plates 8A and 8B. The pair of insulating members 9 electrically insulate between the end plates 8A and 8B and the conductive plate 5 respectively. Each insulating member 9 is formed into a sheet shape with, for example, an electrically insulating resin. The pair of insulating members 9 are provided on the inner surfaces (surfaces on the power storage module laminate 2 side) of the end plates 8A and 8B, for example.
[Configuration of power storage module]

  As shown in FIG. 2, the power storage module 4 includes an electrode stack 11 and a resin sealing body 12 that seals the electrode stack 11. The electrode laminate 11 is configured by laminating a plurality of bipolar electrodes 14 with a separator 13 interposed therebetween. In the present embodiment, the stacking direction of the electrode stack 11 coincides with the stacking direction D1 of the power storage module stack 2. The electrode stack 11 has a side surface 11 a formed by stacking bipolar electrodes 14.

  The bipolar electrode 14 includes an electrode plate 15, a negative electrode 16 provided on one surface 15 a of the electrode plate 15, and a positive electrode 17 provided on the other surface 15 b of the electrode plate 15. The negative electrode 16 is a negative electrode active material layer formed by applying a negative electrode active material. The positive electrode 17 is a positive electrode active material layer formed by coating a positive electrode active material. In the electrode laminate 11, the negative electrode 16 of one bipolar electrode 14 faces the positive electrode 17 of one bipolar electrode 14 adjacent in the stacking direction D <b> 1 via the separator 13. The positive electrode 17 of the one bipolar electrode 14 is opposed to the negative electrode 16 of the other bipolar electrode 14 adjacent in the stacking direction D1 through the separator 13.

  In the electrode laminate 11, a positive electrode termination electrode 18 is disposed at one end in the lamination direction D1. A negative electrode termination electrode 19 is disposed at the other end in the stacking direction D1. The positive electrode termination electrode 18 includes an electrode plate 15 and a positive electrode 17 provided on the other surface 15 b of the electrode plate 15. The positive electrode 17 of the positive electrode termination electrode 18 opposes the negative electrode 16 of the bipolar electrode 14 disposed at one end in the stacking direction D1 with the separator 13 interposed therebetween. One conductive plate 5 adjacent to the power storage module 4 is in contact with one surface 15 a of the electrode plate 15 of the positive electrode termination electrode 18.

  The negative electrode termination electrode 19 includes an electrode plate 15 and a negative electrode 16 provided on one surface 15 a of the electrode plate 15. The negative electrode 16 of the negative electrode termination electrode 19 is opposed to the positive electrode 17 of the bipolar electrode 14 disposed at the other end in the stacking direction D1 via the separator 13. The other conductive plate 5 adjacent to the power storage module 4 is in contact with the other surface 15 b of the electrode plate 15 of the negative electrode termination electrode 19.

  The electrode plate 15 is made of, for example, a metal foil made of nickel or a nickel-plated steel plate, and is formed in a rectangular shape. The region on the edge 15c in the electrode plate 15 is an uncoated region where the positive electrode active material and the negative electrode active material are not coated. Examples of the negative electrode active material constituting the negative electrode 16 include a hydrogen storage alloy. An example of the positive electrode active material constituting the positive electrode 17 is nickel hydroxide.

The separator 13 is formed in a sheet shape, for example. Examples of the separator 13 include a porous film made of a polyolefin resin such as polyethylene (PE) and polypropylene (PP), and a woven or non-woven fabric made of polypropylene, methylcellulose, or the like. The separator 13 may be reinforced with a vinylidene fluoride resin compound. The separator 13 is not limited to a sheet shape, and may be formed in a bag shape.
[Detailed structure of sealed body]

  As shown in FIGS. 2 and 3, the sealing body 12 is provided on the side surface 11 a of the electrode laminate 11 and has a rectangular frame shape. Examples of the resin material constituting the sealing body 12 include polypropylene (PP), polyphenylene sulfide (PPS), and modified polyphenylene ether (modified PPE).

  The sealing body 12 includes a plurality of primary sealing bodies 21 provided on the edge 15c of the electrode plate 15 (the edge of the bipolar electrode 14), respectively, and two primary sealing bodies 21 that surround the entire primary sealing body 21 from the outside. And a next sealing body 22. The primary sealing body 21 is formed in a rectangular frame shape by, for example, resin injection molding, and is firmly bonded to the edge portion 15c by welding using ultrasonic waves or heat. For example, the primary sealing body 21 protrudes from the edge 15c in a direction orthogonal to the stacking direction D1, and is embedded in the secondary sealing body 22 in the protruding portion.

  The secondary sealing body 22 is formed in a rectangular frame shape by, for example, resin injection molding, and is welded to the outer surface of the primary sealing body 21 by heat at the time of injection molding. The secondary sealing body 22 seals between the bipolar electrodes 14 and 14 adjacent in the stacking direction D1. Thereby, an internal space V is formed between the bipolar electrodes 14 adjacent to each other in the stacking direction D1. In the internal space V, an electrolytic solution E made of an alkaline solution such as an aqueous potassium hydroxide solution is accommodated.

  In the secondary sealing body 22, a plurality (four in this embodiment) of mounting portions for mounting a safety valve (not shown) on one of the pair of side portions 22a extending along the flow direction D3 described above. 23 is provided. Each attachment part 23 is comprised by the some opening which penetrates the side part 22a along the drawer direction D2 orthogonal to the distribution direction D3, for example.

  As shown in FIGS. 3 and 4, the secondary sealing body 22 has a first surface 22b and a second surface 22c (see FIG. 2) that face each other in the stacking direction D1. The first surface 22b faces the secondary sealing body 22 of the power storage module 4 adjacent to the other side in the stacking direction D1, or the other end plate 8B in the stacking direction D1. The 2nd surface 22c opposes the secondary sealing body 22 of the electrical storage module 4 adjacent to the one side in the lamination direction D1, or the end plate 8A of the one side in the lamination direction D1.

  The first surface 22b is provided with a plurality of protrusions 24 that protrude from the first surface 22b along the stacking direction D1. In more detail, the protrusion part 24 is provided in each of the four corners of the 1st surface 22b. Each of these four protrusions 24 extends along the outer edge of the first surface 22b and has, for example, a C shape when viewed from the stacking direction D1. In the present embodiment, the four protrusions 24 have the same shape. The height L1 (length in the stacking direction D1) of the protrusion 24 is, for example, about 4 to 5 mm. The thickness L2 of the protrusion 24 (the length in the direction orthogonal to the extending direction of the protrusion 24 when viewed from the stacking direction D1) is, for example, about 1 to 2 mm.

  A plurality of recesses 25 corresponding to the plurality of protrusions 24 are provided on the second surface 22c. In more detail, the recessed part 25 is provided in each of the four corners of the 2nd surface 22c. Each of these four recesses 25 extends along the outer edge of the second surface 22c and has, for example, a C shape in a cross section perpendicular to the stacking direction D1. In the present embodiment, the four recesses 25 have the same shape. The depth L3 (length in the stacking direction D1) of the recess 25 is, for example, about 5 to 6 mm. The thickness L4 of the concave portion 25 (the length in the direction orthogonal to the extending direction of the concave portion 25 when viewed from the stacking direction D1) is, for example, about 1.5 to 1.7 mm. The depth L3 of the recess 25 may be greater than the height L1 of the protrusion 24. The thickness L4 of the recess 25 may be greater than the thickness L2 of the protrusion 24.

  As shown in FIG. 5, the manufacturing process of the power storage device 1 is a stack in which a plurality of power storage modules 4 are stacked along the stacking direction D <b> 1 with the conductive plate 5 interposed therebetween to obtain a power storage module stack 2. Process. In this stacking step, when another power storage module 4 is stacked on one power storage module 4, the protruding portion 24 of one power storage module 4 is inserted into the recess 25 of another power storage module 4. As a result, in the obtained power storage module laminate 2, the protruding portion 24 of one adjacent power storage module 4 protrudes toward the sealing body 12 of the other adjacent power storage module 4, and the recess of the other power storage module 4 25. In the present embodiment, a part of the front end side of the protruding portion 24 is located (arranged) in the concave portion 25.

  In the electricity storage module laminate 2, the depth L <b> 3 of the recess 25 is larger than the height L <b> 1 of the protrusion 24 as described above, so that the tip surface of the protrusion 24 is separated from the bottom surface of the recess 25. Further, since the thickness L4 of the recess 25 is larger than the thickness L2 of the protrusion 24, the protrusion 24 is separated from the inner surface 25a of the recess 25 in the direction orthogonal to the stacking direction D1.

In a direction orthogonal to both the stacking direction D1 and the extending direction of the protrusion 24, the clearance (gap) between the protrusion 24 and the inner surface 25a is a position between the power storage modules 4 and 4 adjacent to each other in the stacking direction D1. It is set smaller than the allowable amount of deviation. The allowable amount is determined based on, for example, the specification of the power storage device 1. For example, the clearance may be set smaller than the dimensional difference between the conductive plate 5 and the primary sealing body 21. Alternatively, when the conductive plate 5 is disposed on the primary sealing body 21 and the conductive plate 5 and the secondary sealing body 22 are opposed to each other, the clearance is separated from the conductive plate 5 and the secondary sealing body. It may be set smaller than the dimensional difference between the stationary body 22 and the stationary body 22. That is, the allowable amount may be set smaller than the dimensional difference between the conductive plate 5 and the portion of the sealing body 12 facing the conductive plate 5. In FIG. 5, the mounting portion 23 of the first-stage and third-stage power storage modules 4 is provided on the other of the pair of side portions 22a extending along the flow direction D3.
[Function and effect]

  In the power storage device 1, the sealing body 12 of one adjacent power storage module 4 is provided with a protruding portion 24 that protrudes toward the sealing body 12 of the other adjacent power storage module 4. The four sealing bodies 12 are provided with recesses 25 corresponding to the protrusions 24. The protrusion 24 is located in the recess 25. Thereby, for example, if one power storage module 4 is stacked on the other power storage module 4 in the opposite direction, the protrusions 24 interfere with each other, so that the power storage modules 4 and 4 are assembled in the wrong direction. Can be prevented. In other words, the power storage modules 4 and 4 are assembled only when one power storage module 4 is stacked in the correct orientation with respect to another power storage module 4 so that the protrusion 24 is disposed in the recess 25. Can do. Therefore, according to the power storage device 1, it is possible to prevent erroneous assembly of the power storage modules 4.

  In the power storage device 1, the clearance between the protruding portion 24 and the inner surface 25 a of the concave portion 25 is between adjacent power storage modules 4 and 4 in the direction orthogonal to both the stacking direction D1 and the extending direction of the protruding portion 24. Smaller than the allowable amount of displacement. Thereby, the adjacent electrical storage modules 4 and 4 can be positioned by arrange | positioning the protrusion part 24 in the recessed part 25. FIG.

  In the power storage device 1, the protruding portion 24 is provided in a portion other than the side portion 22 a extending along the drawing direction D <b> 2 orthogonal to both the stacking direction D <b> 1 and the flow direction D <b> 3 in the secondary sealing body 22. . More specifically, the protrusion 24 is provided at the corner of the first surface 22b. Thereby, for example, when the refrigerant is circulated in the flow path 5a along the flow direction D3, it is possible to prevent the refrigerant from being interrupted by the protrusion 24, and the refrigerant can be circulated effectively. .

  In the power storage device 1, the protrusions 24 are provided at the four corners (four corners of the first surface 22 b) of the secondary sealing body 22 when viewed from the stacking direction D <b> 1. Thereby, when components, such as a safety valve, are attached to the sealing body 12, for example, it can suppress that the protrusion part 24 interferes with the said components, and can ensure a design freedom.

  In the power storage device 1, the sealing body 12 includes a plurality of primary sealing bodies 21 provided at the edges of the plurality of bipolar electrodes 14, and a secondary sealing body that surrounds the plurality of primary sealing bodies 21 from the outside. 22, and the protrusion 24 and the recess 25 are provided in the secondary sealing body 22. Thereby, the gap between adjacent bipolar electrodes 14 and 14 can be reliably sealed by the sealing body 12.

  In the power storage device 1, the sealing body 12 is an injection molded body of resin. Thereby, in the configuration in which the sealing body 12 is an injection molded body of resin, it is possible to prevent erroneous assembly of the power storage modules 4 and 4.

  In the power storage device 1, a recess 25 is formed in the sealing body 12. Thereby, in the formation part of the recessed part 25, the thickness (The length in the direction orthogonal to the extending direction of the recessed part 25 when it sees from the lamination direction D1) is thin. As a result, it is possible to suppress the occurrence of voids and sink marks when the sealing body 12 (secondary sealing body 22) is molded.

  Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment. The plurality of protrusions 24 may include at least a pair of protrusions 24 having different shapes. As a specific example, in the above embodiment, even if the shape of the two protrusions 24 provided on one side in the pull-out direction D2 is different from the shape of the two protrusions 24 provided on the other side in the pull-out direction D2. Good. In this case, according to the change of the shape of the protrusion part 24, the shape of the recessed part 25 in which the protrusion part 24 is inserted may also be changed. Also according to such a modification, the incorrect assembly | attachment of the electrical storage modules 4 can be prevented similarly to the said embodiment. Furthermore, it is possible to prevent the power storage modules 4 and 4 from being assembled together while the angle around the axis along the stacking direction D1 is incorrect. In the specific example described above, it is possible to prevent the power storage modules 4 and 4 from being assembled while the direction in the pull-out direction D2 is incorrect.

  The shape and arrangement of the protrusion 24 and the recess 25 are not limited to the shape and arrangement of the above embodiment. One protrusion 24 and one recess 25 may be provided. The protrusion 24 may be formed in a pin shape having a circular cross section or a rectangle, and the recess 25 may be a hole having a circular cross section or a rectangle. When the adjacent power storage modules 4, 4 are not positioned using the protrusion 24 and the recess 25, the clearance between the protrusion 24 and the inner surface 25 a of the recess 25 is a positional deviation between the adjacent power storage modules 4, 4. It may not be smaller than the allowable amount. The protrusion 24 may be provided on the side 22a extending along the pull-out direction D2 in the secondary sealing body 22, or provided on the side extending along the flow direction D3. Also good. The conductive plate 5 may have any shape, and the conductive plate 5 may not be provided with the flow path 5a.

  DESCRIPTION OF SYMBOLS 1 ... Power storage device, 4 ... Power storage module, 5 ... Conductive plate (conductive member), 5a ... Flow path, 8A, 8B ... End plate, 11 ... Electrode laminated body, 11a ... Side surface, 12 ... Sealed body, 14 ... Bipolar Electrode, 21 ... primary sealing body, 22 ... secondary sealing body, 22a ... side, 22b ... first surface, 24 ... projection, 25 ... recess, 25a ... inner surface, D1 ... stacking direction, D2 ... extraction direction , D3: Distribution direction (predetermined direction).

Claims (7)

A plurality of stacked power storage modules;
A conductive member interposed between the adjacent power storage modules and electrically connecting the adjacent power storage modules;
The power storage module includes an electrode stack in which a plurality of bipolar electrodes are stacked, and a sealing body that is provided on a side surface of the electrode stack to form a frame and seals between the adjacent bipolar electrodes. And
The sealing body of one of the adjacent power storage modules is provided with a protruding portion that protrudes toward the sealing body side of the other adjacent power storage module, and the sealing body of the other power storage module Is provided with a recess corresponding to the protruding portion,
The protruding portion is a power storage device located in the recess.   The clearance between the projecting portion and the inner surface of the recess in at least one direction orthogonal to the stacking direction of the power storage modules is smaller than an allowable amount of misalignment between the adjacent power storage modules. The power storage device described. A plurality of the protrusions and the recesses are provided,
The power storage device according to claim 1, wherein the plurality of protrusions include at least a pair of the protrusions having different shapes. The conductive member is provided with a flow path extending along a predetermined direction orthogonal to the stacking direction of the power storage modules,
The said protrusion part is provided in parts other than the edge part extended along the direction orthogonal to both the lamination direction and the predetermined direction of the said electrical storage module in the said sealing body. The power storage device according to claim 1. The sealing body has a rectangular frame shape,
The power storage device according to any one of claims 1 to 4, wherein the protrusion is provided at each of the four corners of the sealing body when viewed from the stacking direction of the power storage module. The sealing body has a plurality of primary sealing bodies provided respectively at edges of the plurality of bipolar electrodes, and a secondary sealing body surrounding the plurality of primary sealing bodies from the outside,
The power storage device according to any one of claims 1 to 5, wherein the protrusion and the recess are provided in the secondary sealing body.   The power storage device according to claim 1, wherein the sealing body is a resin injection-molded body.

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