JP2018106976A - Power storage module and manufacturing method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power storage module capable of improving sealing performance and a manufacturing method of the power storage module.SOLUTION: A power storage module 10 comprises: a first cylindrical seal member 50 provided on an external side of a plurality of bipolar electrodes 32 in a direction crossing a lamination direction of the plurality of bipolar electrodes 32; and a second seal member 60 provided on the external side of the first cylindrical seal member 50 in the direction crossing the lamination direction. The first cylindrical seal member 50 includes a plurality of frame bodies 51 provided between adjacent electrode plates 34 in the lamination direction. Each frame body 51 includes: a seal part 52 overlapped with a peripheral edge part 34c of each electrode plate 34 in the lamination direction; and a projection part 53 projected to the external side from each electrode plate 34 in the direction crossing to lamination direction. A gap S is formed between adjacent projection parts 53 in the lamination direction, and a part of the second seal member 60 is entered into the gap S.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a power storage module and a method for manufacturing a power storage module.

  As described in Patent Document 1, a bipolar battery including a bipolar electrode in which a positive electrode is formed on one surface of a current collector and a negative electrode is formed on the other surface is known. In this bipolar battery, a plurality of bipolar electrodes are stacked in series across an electrolyte layer. The electrolyte layer is held by the separator. A sealing resin member is disposed on the outer peripheral portion of the separator where the electrolyte is held.

JP 2011-151016 A

  In the bipolar battery as described above, a seal member is provided in order to prevent electrolyte solution, gas, and the like from flowing into adjacent cells. However, in the bipolar battery described in Patent Document 1, since the sealing member is provided only on the outer peripheral portion of the separator, the sealing performance is insufficient. Therefore, it is required to improve the sealing performance of the bipolar battery.

  An object of this invention is to provide the electrical storage module which can aim at the improvement of a sealing performance, and the manufacturing method of an electrical storage module.

  One embodiment of the present invention is an electricity storage in which a plurality of bipolar electrodes each including a positive electrode provided on an electrode plate and a first surface of the electrode plate and a negative electrode provided on a second surface of the electrode plate are stacked via a separator. A cylindrical first seal member provided outside the plurality of bipolar electrodes in a direction intersecting the stacking direction of the plurality of bipolar electrodes, and an outside of the first seal member in the direction intersecting the stacking direction A first seal member having a plurality of frames provided between adjacent electrode plates in the stacking direction, each of the frames in the stacking direction. Including a seal portion that overlaps the peripheral edge of the electrode plate, and a protruding portion that protrudes outward from the electrode plate in a direction intersecting the stacking direction, and a gap is formed between the adjacent protruding portions in the stacking direction, Between intrudes part of the second seal member.

  This power storage module includes a first seal member and a second seal member having a plurality of frames. A gap is formed between the projecting portions of the frame bodies adjacent in the stacking direction, and a part of the second seal member enters the gap. As a result, for each bipolar electrode, a seal portion is formed between the first seal member and the second seal member in a direction crossing the stacking direction. Therefore, since the seal length between the first seal member and the second seal member can be increased, the sealing performance of the power storage module can be improved.

  Frame bodies may be joined to the first surface and the second surface of the electrode plate, respectively. In this case, since the first surface and the second surface of the electrode plate are both sealed by the first seal member, the sealing performance with respect to the peripheral portion of the electrode plate can be further improved.

  In the stacking direction, the sum of the thickness of the seal portion and the electrode plate is larger than the thickness of the protruding portion, and the protruding portion may be recessed in the stacking direction with respect to the seal portion. In this case, the gap can be reliably formed by the recess of the frame. Therefore, since the seal length between the first seal member and the second seal member can be increased, the sealing performance of the power storage module can be improved.

  A method for manufacturing a power storage module according to one embodiment of the present invention includes a first surface, an electrode plate having a second surface opposite to the first surface, a positive electrode provided on the first surface, and a second surface. Preparing a plurality of bipolar electrodes having a negative electrode, and a first sealing step of joining a frame as a sealing component to at least one side of the first surface and the second surface at the peripheral portion of the electrode plate And a laminating step of laminating a plurality of bipolar electrodes joined to the frame through a separator, and a second sealing step of forming a second seal member outside the frame with respect to the laminated bipolar electrodes In the first sealing step, each inner peripheral portion of the frame body overlaps the peripheral edge of the electrode plate in the bipolar electrode stacking direction, and each outer peripheral portion of the frame member is stacked in the stacking direction. Electrodes in the direction intersecting The frame body is joined so as to protrude outward from the peripheral edge portion, and in the laminating step, a gap is formed between portions on the outer peripheral side of adjacent frame bodies in the laminating direction, and in the second sealing step, the gap is formed. The second seal member is formed so that a part of the second seal member enters.

  In this method of manufacturing an electricity storage module, in the stacking step, a gap is formed between portions on the outer peripheral side of adjacent frames in the stacking direction. In the second sealing step, the second sealing member is formed so that a part of the second sealing member enters the gap. Thus, for each bipolar electrode, a seal portion is formed in a direction intersecting the stacking direction between the frame and the second seal member. Therefore, since the seal length between the frame and the second seal member can be increased, the sealing performance of the power storage module can be improved.

  ADVANTAGE OF THE INVENTION According to this invention, the electrical storage module which can aim at the improvement of a sealing performance, and the manufacturing method of an electrical storage module are provided.

1 is a cross-sectional view schematically showing a power storage device including a power storage module according to a first embodiment of the present invention. It is sectional drawing which shows schematically the electrical storage module which comprises the electrical storage apparatus of FIG. FIG. 3 is an enlarged cross-sectional view of a part of the power storage module in FIG. 2. It is a figure for demonstrating the manufacturing method of the electrical storage module of FIG. It is a figure for demonstrating the manufacturing method of the electrical storage module of FIG. It is a figure for demonstrating the manufacturing method of the electrical storage module of FIG. It is sectional drawing to which a part of electrical storage module which concerns on 2nd Embodiment of this invention was expanded. It is sectional drawing to which a part of electrical storage module which concerns on 3rd Embodiment of this invention was expanded. It is sectional drawing which expanded a part of electrical storage module which concerns on a comparative example.

  Hereinafter, various embodiments will be described in detail with reference to the drawings. In addition, in each drawing, the same code | symbol is attached | subjected to the same or an equivalent part, and the overlapping description is abbreviate | omitted.

[First Embodiment]
FIG. 1 is a cross-sectional view schematically showing a power storage device including the power storage module according to the first embodiment of the present invention. 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 plurality (three in this embodiment) of power storage modules 10, but may include a single power storage module 10. The power storage module 10 is a bipolar battery, for example. The power storage module 10 is a secondary battery such as a nickel hydride secondary battery or a lithium ion secondary battery, but may be an electric double layer capacitor. In the following description, a nickel metal hydride secondary battery is illustrated.

  The plurality of power storage modules 10 are stacked via a conductive plate 14 such as a metal plate. When viewed from the stacking direction, the power storage module 10 and the conductive plate 14 have, for example, a rectangular shape. The detailed structure of each power storage module 10 will be described later. The conductive plates 14 are also arranged outside the power storage modules 10 positioned at both ends in the stacking direction (Z-axis direction) of the power storage modules 10. The conductive plate 14 is electrically connected to the adjacent power storage module 10. Thereby, the some electrical storage module 10 is connected in series in the lamination direction. In the stacking direction, a positive electrode terminal 24 is connected to the conductive plate 14 located at one end, and a negative electrode terminal 26 is connected to the conductive plate 14 located at the other end. Each of the positive terminal 24 and the negative terminal 26 may be integrated with the conductive plate 14 to be connected. The positive electrode terminal 24 and the negative electrode terminal 26 extend in a direction crossing the stacking direction (X-axis direction). The positive and negative terminals 24 and 26 can charge and discharge the power storage device 1.

  The conductive plate 14 can also function as a heat radiating plate for releasing heat generated in the power storage module 10. A plurality of gaps 14 a are provided inside the conductive plate 14. When the refrigerant such as air passes through the gap 14a, the heat from the power storage module 10 can be efficiently released to the outside. Each gap 14a extends, for example, in a direction (Y-axis direction) intersecting the stacking direction. When viewed from the stacking direction, the conductive plate 14 is smaller than the power storage module 10, but may be the same as or larger than the power storage module 10.

  The power storage device 1 includes a restraining member 16 that restrains alternately stacked power storage modules 10 and conductive plates 14 in the stacking direction. The restraining member 16 includes a pair of restraining plates 16A and 16B and a connecting member (bolt 18 and nut 20) for joining the restraining plates 16A and 16B to each other. An insulating film 22 such as a resin film is disposed between each of the restraining plates 16A and 16B and the conductive plate 14. Each restraint plate 16A, 16B is comprised, for example with metals, such as iron. When viewed from the stacking direction, each of the restraining plates 16A and 16B and the insulating film 22 has a rectangular shape, for example. The insulating film 22 is larger than the conductive plate 14, and the restraining plates 16 </ b> A and 16 </ b> B are larger than the power storage module 10. As viewed from the stacking direction, an insertion hole 16A1 through which the shaft portion of the bolt 18 is inserted is provided at a position on the outer side of the power storage module 10 at the edge portion of the restraint plate 16A. Similarly, an insertion hole 16 </ b> B <b> 1 through which the shaft portion of the bolt 18 is inserted is provided at a position on the outer side of the power storage module 10 at the edge portion of the restraining plate 16 </ b> B when viewed from the stacking direction. When each restraint plate 16A, 16B has a rectangular shape when viewed from the stacking direction, the insertion hole 16A1 and the insertion hole 16B1 are located at the corners of the restraint plates 16A, 16B, for example.

  One constraining plate 16A is abutted against the conductive plate 14 connected to the negative terminal 26 via the insulating film 22, and the other constraining plate 16B has the insulating film 22 applied to the conductive plate 14 connected to the positive terminal 24. Has been hit through. For example, the bolt 18 is passed through the insertion hole 16A1 and the insertion hole 16B1 from one restraint plate 16A side to the other restraint plate 16B side, and a nut 20 is attached to the tip of the bolt 18 protruding from the other restraint plate 16B. It is screwed. Thereby, the insulating film 22, the conductive plate 14, and the power storage module 10 are sandwiched and unitized, and a restraining load is applied in the stacking direction.

  Next, the structure of the power storage module 10 will be described. 2 is a cross-sectional view schematically showing a power storage module constituting the power storage device of FIG. As shown in FIG. 2, the power storage module 10 includes a plurality of bipolar electrodes 32. Each bipolar electrode 32 includes an electrode plate 34, a positive electrode 36 provided on the first surface 34 a of the electrode plate 34, and a negative electrode 38 provided on the second surface 34 b of the electrode plate 34. The plurality of bipolar electrodes 32 are stacked via the separator 40 to form a stacked body 30. When viewed from the stacking direction of the bipolar electrode 32, the stacked body 30 has, for example, a rectangular shape. In the stacked body 30, the positive electrode 36 of one bipolar electrode 32 faces the negative electrode 38 of one bipolar electrode 32 adjacent in the stacking direction across the separator 40, and the negative electrode 38 of one bipolar electrode 32 connects the separator 40. It faces the positive electrode 36 of the other bipolar electrode 32 that is adjacent in the stacking direction. In the laminating direction, an electrode plate 34 (negative electrode termination electrode) having a negative electrode 38 disposed on the inner surface is disposed at one end of the laminate 30 and a positive electrode 36 is disposed on the inner surface at the other end. 34 (positive terminal electrode) is arranged. The negative electrode 38 of the negative electrode-side termination electrode faces the positive electrode 36 of the uppermost bipolar electrode 32 with the separator 40 interposed therebetween. The positive electrode 36 of the positive terminal electrode is opposed to the negative electrode 38 of the lowermost bipolar electrode 32 with the separator 40 interposed therebetween. The electrode plates 34 of these termination electrodes are respectively connected to the adjacent conductive plates 14 (see FIG. 1).

  The electrode plate 34 is a rectangular metal foil made of nickel, for example. An example of the positive electrode active material constituting the positive electrode 36 is nickel hydroxide. Examples of the negative electrode active material constituting the negative electrode 38 include a hydrogen storage alloy. The formation region of the negative electrode 38 on the second surface 34 b of the electrode plate 34 is slightly larger than the formation region of the positive electrode 36 on the first surface 34 a of the electrode plate 34. The edge of the electrode plate 34 is an uncoated region where the positive electrode active material and the negative electrode active material are not coated.

  For example, the separator 40 is formed on a sheet. Examples of the material forming the separator 40 include porous films made of polyolefin resins such as polyethylene (PE) and polypropylene (PP), woven fabrics and nonwoven fabrics made of polypropylene, polyethylene terephthalate (PET), methylene cellulose, and the like. The The separator 40 may be reinforced with a vinylidene fluoride resin compound. In addition, the separator 40 is not restricted on a sheet | seat, For example, you may use a bag-shaped thing.

  The power storage module 10 includes a cylindrical first seal member 50 provided outside the plurality of bipolar electrodes 32 (laminated body 30) in a direction crossing the stacking direction, and a first seal member 50 in a direction crossing the stacking direction. And a second seal member 60 provided on the outer side. The first seal member 50 is configured to surround the side surface of the stacked body 30, and the second seal member 60 is configured to surround the side surface of the first seal member 50. The second seal member 60 has a cylindrical shape, for example. A peripheral edge portion 34 c (an uncoated region of the electrode plate 34) of the electrode plate 34 is held in a state of being buried in the first seal member 50. Thereby, an internal space V partitioned by the electrode plate 34 and the first seal member 50 is formed between the electrode plates 34 adjacent in the stacking direction. In the internal space V, for example, an electrolytic solution (not shown) made of an alkaline solution such as an aqueous potassium hydroxide solution is accommodated. The internal space V is kept airtight by the electrode plate 34, the first seal member 50, and the second seal member.

  The first seal member 50 and the second seal member 60 are made of, for example, an insulating resin material. Examples of the resin material include polypropylene (PP), polyphenylene sulfide (PPS), and modified polyphenylene ether (modified PPE).

  Next, the configuration of the first seal member 50 and the second seal member 60 will be described in detail with reference to FIG. FIG. 3 is an enlarged cross-sectional view of a part of the power storage module of FIG. 3 shows a power storage module in which two bipolar electrodes 32 are stacked for simplicity of explanation, the number of bipolar electrodes 32 to be stacked is not particularly limited. The first seal member 50 has a frame shape. As shown in FIG. 3, the first seal member 50 includes a plurality of frames 51 that are seal components provided between the electrode plates 34 adjacent in the stacking direction. Each of the frame bodies 51 includes a seal portion 52 that overlaps the peripheral edge portion 34c of the electrode plate 34 in the stacking direction, and a protrusion 53 that protrudes outward from the electrode plate 34 in a direction intersecting the stacking direction. The frame 51 is provided on the first surface 34 a side and the second surface 34 b side with respect to the one electrode plate 34. On both the first surface 34a and the second surface 34b of the electrode plate 34, the seal portion 52 of the frame 51 is joined to the peripheral portion 34c. Further, the frame body 51 provided on the first surface 34 a side of the one electrode plate 34 and the frame body 51 provided on the second surface 34 b side of the electrode plate 34 are joined to each other at the protruding portions 53. Has been. Thereby, a seal is formed between the electrode plate 34 and the frame body 51.

  The frame 51 has a step between the seal portion 52 and the protruding portion 53. The sum of the thickness t52 of the seal portion 52 and the thickness t34 of the electrode plate 34 is larger than the thickness t53 of the protruding portion 53, and the protruding portion 53 is recessed with respect to the seal portion 52 in the stacking direction. As a result, a gap S is formed between the protrusion 53 of the frame 51 joined to one electrode plate 34 and the protrusion 53 of the frame 51 joined to another electrode plate 34 adjacent to the electrode plate 34. Is formed. The frame bodies 51 are also joined to the electrode plates 34 of the negative electrode side end electrode and the positive electrode side termination electrode, respectively. Also between the protrusion 53 of the frame 51 joined to the electrode plate 34 of the negative electrode and the terminal electrode of the positive electrode, and the protrusion 53 of the frame 51 joined to the electrode plate 34 of the bipolar electrode 32, A gap S is formed. The frame body 51 joined to the electrode plate 34 of the negative electrode end electrode and the positive electrode termination electrode may or may not have a step between the seal portion 52 and the protruding portion 53. Good.

  A part of the second seal member 60 enters the gap S, and the second seal member 60 and the frame body 51 (first seal member 50) are joined to each other. As a result, a seal portion C is formed that is interposed between the frame 51 joined to one electrode plate 34 and the frame 51 joined to another electrode plate 34 adjacent to the electrode plate 34. . The seal portion C includes a side surface portion that extends in the stacking direction (Z-axis direction and Y direction) and an interposition portion that extends in a direction intersecting the stacking direction (X-axis direction and Y-axis direction). The side surface portion seals the side surface of the frame body 51, and the interposition portion seals the recessed portion of the frame body 51.

  As described above, the power storage module 10 according to the present embodiment includes the first seal member 50 and the second seal member 60 having the plurality of frame bodies 51. A gap S is formed between the protrusions 53 of the frame bodies 51 adjacent in the stacking direction, and a part of the second seal member 60 enters the gap S. Thereby, for each bipolar electrode 32, an interposed portion of the seal portion C is formed between the first seal member 50 and the second seal member 60 in a direction crossing the stacking direction. On the other hand, in the power storage module 10A according to the comparative example (see FIG. 9), the frame 51A does not have a protruding portion, and no gap is formed. With this structure, in the power storage module 10A according to the comparative example, the seal portion C between the first seal member 50A and the second seal member 60A is formed only on the side surface of the first seal member 50A. That is, the seal portion C of the power storage module 10A according to the comparative example has only the side surface portion and does not have the interposition portion. Therefore, compared with the power storage module 10A according to the comparative example, the power storage module 10 according to the present embodiment increases the seal length (the length of the seal portion C) between the first seal member 50 and the second seal member 60. Therefore, the sealing performance of the power storage module can be improved.

  In the present embodiment, the frame bodies 51 are joined to the first surface 34a and the second surface 34b of the electrode plate 34, respectively. Thereby, since both the 1st surface 34a and the 2nd surface 34b of the electrode plate 34 are sealed by the 1st seal member 50, the sealing performance with respect to the peripheral part 34c of the electrode plate 34 can further be improved.

  In the present embodiment, in the stacking direction, the sum of the thickness t52 of the seal portion 52 and the thickness t34 of the electrode plate 34 is larger than the thickness t53 of the protruding portion 53, and the protruding portion 53 is in the stacking direction with respect to the seal portion 52. It is recessed. Thereby, the clearance gap S can be reliably formed by the dent of the frame 51. Accordingly, since the seal length between the first seal member 50 and the second seal member 60 can be increased, the sealing performance of the power storage module 10 can be improved.

[Method for manufacturing power storage module]
Next, with reference to FIGS. 4-6, the manufacturing method of the electrical storage module 10 is demonstrated. 4-6 is a figure for demonstrating the manufacturing method of the electrical storage module of FIG. First, as shown in FIG. 4A, an electrode plate 34 having a first surface 34a and a second surface 34b opposite to the first surface 34a, a positive electrode 36 provided on the first surface 34a, A plurality of bipolar electrodes 32 having a negative electrode 38 provided on the second surface 34b are prepared (preparation step). In addition, a plurality of frames 51 for bonding to the bipolar electrode 32 are prepared. At this time, the frame 51 is in a state where there is no step between the seal portion 52 and the protruding portion 53.

  Next, as shown in FIG. 4B, the frame 51 is joined to the first surface 34a and the second surface 34b at the peripheral edge 34c of the electrode plate 34 (first sealing step). The electrode plate 34 and the frame 51 are joined by, for example, hot pressing. In this first sealing step, the inner peripheral portions of the frame 51 overlap the peripheral edge 34c of the electrode plate 34 in the stacking direction of the bipolar electrodes 32, and the outer peripheral portions of the frame 51 are stacked. The frame body 51 is joined so as to protrude outward from the peripheral edge 34c of the electrode plate 34 in a direction intersecting the direction. Thereby, the seal part 52 and the protrusion part 53 are formed in the frame 51, and the seal part 52 of the frame 51 is joined to the peripheral part 34c of the first surface 34a and the second surface 34b of the electrode plate 34, respectively. Become. Further, by this step, the protruding portion 53 is recessed with respect to the seal portion 52 in the stacking direction. The frame body 51 is bonded only to the second surface 34b with respect to the electrode plate 34 of the negative side electrode, and the frame body 51 is bonded only to the first surface 34a with respect to the electrode plate 34 of the positive terminal electrode. Join.

  Next, as shown in FIG. 5, the plurality of bipolar electrodes 32 to which the frame body 51 is bonded are stacked via the separator 40 (stacking step). By this lamination process, as shown in FIG. 6, a laminated body 30 is formed. Moreover, the clearance gap S is formed between the protrusion parts 53 of the frame 51 adjacent in the lamination direction. In the present embodiment, the frame 51 is joined to the bipolar electrode 32 before the lamination step, but the frame 51 may be joined to the bipolar electrode 32 after the lamination step.

  Finally, a second seal member 60 is formed outside the frame 51 (first seal member 50) for the plurality of stacked bipolar electrodes 32 (stacked body 30) (second sealing step). In the second sealing step, the second sealing member 60 is formed so that a part of the second sealing member 60 enters the gap S formed in the stacking step. The second seal member 60 is formed by, for example, injection molding. Through the above steps, the power storage module 10 shown in FIG. 3 is manufactured.

  As described above, in this power storage module manufacturing method, in the stacking step, the gap S is formed between the protrusions 53 on the outer peripheral side of the frame bodies 51 adjacent in the stacking direction. In the second sealing step, the second seal member 60 is formed so that a part of the second seal member 60 enters the gap S. As a result, for each bipolar electrode 32, a portion sealed between the frame body 51 (first seal member 50) and the second seal member 60 in a direction crossing the stacking direction is formed. Therefore, since the seal length between the frame 51 (first seal member 50) and the second seal member 60 can be increased, the sealing performance of the power storage module can be improved.

[Second Embodiment]
FIG. 7 is an enlarged cross-sectional view of a part of the power storage module according to the second embodiment of the present invention. The power storage module 110 shown in FIG. 7 is different from the power storage module 10 shown in FIG. 1 in that a frame 151 is joined to one electrode plate 134 only on the first surface 134a side. That is, in the power storage module 10, the two frames 51 are provided between the adjacent electrode plates 34, whereas in the power storage module 110, the frame 151 provided between the adjacent electrode plates 34 is There is only one. Further, in the power storage module 110, the frame 151 is joined only to the first surface 134a of the electrode plate 134 of the positive terminal electrode, and the frame 151 is not joined to the electrode plate 134 of the negative terminal electrode. In this case, the sealing performance between the electrode plate 34 of the negative terminal electrode and the frame 151 is ensured by the electrode plate 34 of the negative terminal electrode and the second seal member 160 provided outside the frame 151. . The frame 151 may be bonded only to the second surface 134b side. In this case, the frame 151 is bonded only to the second surface 134b of the electrode plate 134 of the negative terminal electrode.

  Also in the power storage module 110 according to the second embodiment, each of the frames 151 protrudes outward from the electrode plate 134 in the direction intersecting the stacking direction and the seal portion 152 that overlaps the peripheral edge 134c of the electrode plate 134 in the stacking direction. And a projecting portion 153. In addition, the frame 151 has a step between the seal portion 152 and the protruding portion 153, and the protruding portion 153 is recessed with respect to the seal portion 152 in the stacking direction. Thereby, the clearance gap S is formed between the protrusion parts 153 of the adjacent frame 151, and the seal | sticker part C which enters the clearance gap S is formed. Therefore, also in the electrical storage module 110, the same effect as the electrical storage module 10 according to the first embodiment can be obtained. Further, in the power storage module 110, since the frame 151 is joined to only one of the first surface 134a and the second surface 134b, the power storage module 110 can be easily manufactured.

[Third Embodiment]
FIG. 8 is an enlarged cross-sectional view of a part of the power storage module according to the third embodiment of the present invention. The power storage module 210 shown in FIG. 8 is different from the power storage module 10 shown in FIG. 1 in that the protruding portion 253 of the frame 251 is not recessed in the stacking direction with respect to the seal portion 252 and one electrode The projecting portion 253 of the frame body 251 provided on the first surface 234a side of the plate 234 and the projecting portion 253 of the frame body 251 provided on the second surface 234b side of the electrode plate 234 are not joined to each other. Is a point. In this case, the protruding portion 253 of the frame body 251 provided on the first surface 234a side of one electrode plate 234 and the protruding portion 253 of the frame body 251 provided on the second surface 234b side of the electrode plate 234. A gap S is formed between them, and a seal portion C that enters the gap S is formed. Therefore, the same effect as the power storage module 10 according to the first embodiment can be obtained in the power storage module 210 according to the third embodiment.

  As mentioned above, although embodiment of this invention has been described, this invention is not limited to embodiment mentioned above, A various deformation | transformation aspect is employable. For example, in the above-described embodiment, when the frame body 51 is pressurized in the first sealing step, the protruding portion 53 is recessed in the stacking direction with respect to the sealing portion 52. The seal portion 52 may be recessed in the stacking direction.

  In the above embodiment, the frame body 51 is individually bonded to one electrode plate 34, but the frame body 51 may be bonded to a plurality of electrode plates 34 at a time. In this case, pressure is applied only to a portion where the frame body 51 and the electrode plate 34 overlap in the stacking direction so that a gap S is formed between the protruding portions 53 of the adjacent frame bodies 51. In this way, the power storage module 10 can be more easily manufactured by joining the frame body 51 to the electrode plate 34.

  DESCRIPTION OF SYMBOLS 1 ... Power storage device 10, 10A, 110, 210 ... Power storage module, 14 ... Conductive plate, 16 ... Restraining member, 22 ... Insulating film, 24 ... Positive electrode terminal, 26 ... Negative electrode terminal, 30 ... Laminated body, 32 ... Bipolar electrode 34, 134, 234 ... electrode plate, 34a, 134a, 234a ... first surface, 34b, 134b, 234b ... second surface, 34c, 134c ... peripheral portion, 36 ... positive electrode, 38 ... negative electrode, 40 ... separator, 50 , 50A ... first seal member, 51, 51A, 151, 251 ... frame, 52, 252 ... seal part (inner peripheral side part), 53, 153, 253 ... projecting part (outer peripheral part), 60, 60A, 160 ... second seal member, C ... seal portion, S ... gap, V ... internal space.

Claims (4)

A power storage module in which a plurality of bipolar electrodes each including an electrode plate, a positive electrode provided on the first surface of the electrode plate, and a negative electrode provided on the second surface of the electrode plate are stacked via a separator,
A cylindrical first seal member provided outside the plurality of bipolar electrodes in a direction intersecting a stacking direction of the plurality of bipolar electrodes;
A second seal member provided outside the first seal member in a direction intersecting the stacking direction,
The first seal member has a plurality of frames provided between the electrode plates adjacent in the stacking direction,
Each of the frames includes a seal portion that overlaps with a peripheral portion of the electrode plate in the stacking direction, and a protruding portion that protrudes outward from the electrode plate in a direction intersecting the stacking direction,
A gap is formed between the protrusions adjacent in the stacking direction,
The power storage module, wherein a part of the second seal member enters the gap.   The power storage module according to claim 1, wherein the frame body is bonded to the first surface and the second surface of the electrode plate. In the laminating direction, the total thickness of the seal portion and the electrode plate is larger than the thickness of the protruding portion,
The power storage module according to claim 1, wherein the protruding portion is recessed in the stacking direction with respect to the seal portion. A plurality of bipolar electrodes having an electrode plate having a first surface and a second surface opposite to the first surface, a positive electrode provided on the first surface, and a negative electrode provided on the second surface A preparation process to prepare,
A first sealing step of joining a frame, which is a sealing component, to at least one side of the first surface and the second surface at a peripheral portion of the electrode plate;
A laminating step of laminating a plurality of the bipolar electrodes to which the frame body is bonded through a separator;
A second sealing step of forming a second seal member on the outside of the frame body with respect to the plurality of stacked bipolar electrodes,
In the first sealing step, each inner peripheral portion of the frame body overlaps the peripheral edge portion of the electrode plate in the lamination direction of the bipolar electrode, and each outer peripheral portion of the frame body is the Joining the frame so as to protrude outward from the peripheral edge of the electrode plate in a direction intersecting the stacking direction,
In the laminating step, a gap is formed between the outer peripheral portions of the frame bodies adjacent in the laminating direction,
In the second sealing step, the second sealing member is formed so that a part of the second sealing member enters the gap.

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