JP2019129030A - Power storage module, and manufacturing method of power storage module - Google Patents

Abstract

To provide a power storage module capable of preventing short circuit while avoiding increase of cost, and to provide a manufacturing method of power storage module.SOLUTION: A power storage module 4 includes multiple bipolar electrodes 14, multiple separators 13, and multiple first resin parts 21 for forming an internal space V between the bipolar electrodes 14. The bipolar electrode 14 has an electrode plate 15 having a first face 15a, and a positive electrode 16 formed on the first face 15a. The first face 15a includes a first region 15d where the positive electrode 16 is formed, and a second region 15e exposed from the positive electrode 16 on the outside of the first region 15d and subjected to surface roughening. The separator 13 is extending from the first region 15d to overlap the second region 15e. The first resin parts 21 are placed to overlap the separator 13 and the second region 15e. The separator 13 and the first resin parts 21 are deposited to the second region 15e.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a storage module and a method of manufacturing the storage module.

  Patent Document 1 describes a bipolar plate type laminated battery. In this bipolar plate type laminated battery, a space defined by the negative side current collector plate, the positive side current collector plate and the cell casing is constituted by a plurality of single cells separated by a plurality of bipolar plates. . A positive electrode and a negative electrode are arranged on both sides of one bipolar plate. A separator is interposed between the positive electrode and the negative electrode.

Patent No. 4570863

  In the above laminated battery, the bipolar plate extends outside the positive electrode and the negative electrode and is sandwiched by the cell casing. On the other hand, the separator is smaller than the bipolar plate and does not reach the sandwiching portion of the bipolar plate in the cell casing.

  Therefore, in the above laminated battery, there is a possibility that a short circuit may occur in a part of the bipolar plate exposed from the separator when viewed in the laminating direction. On the other hand, in order to prevent a short circuit, it is possible to enlarge a separator and to set it as the structure clamped by a cell casing. However, in this case, it is necessary to constitute one cell casing by two parts for sandwiching the separator. Therefore, the cost increases due to the increase in the number of parts.

  Then, an object of the present invention is to provide a storage module capable of preventing a short circuit while avoiding an increase in cost, and a method of manufacturing the storage module.

  The storage module of the present invention comprises: a plurality of bipolar electrodes stacked along a first direction; and a plurality of separators disposed between adjacent bipolar electrodes along a first direction along a first direction Forming a space between the bipolar electrodes to be formed and a plurality of resin portions for sealing the space, the bipolar electrode comprising an electrode plate having a first surface, and an active material layer formed on the first surface And the first surface includes a first region in which an active material layer is formed, and a second region that is exposed from the active material layer outside the first region and is roughened, The separator extends from the first area to overlap the second area as viewed from the first direction, and the resin portion is arranged to overlap the separator and the second area as viewed from the first direction. And the separator and the resin part are welded to the second region. To have.

  In this storage module, the electrode plate of the bipolar electrode has a first surface including a first region, and a second region exposed and roughened from the active material layer outside the first region. ing. In addition, the separator extends so as to overlap the second region as viewed from the first direction. Moreover, a resin portion for forming a space between the bipolar electrodes and sealing the space is disposed so as to overlap the separator and the second region as viewed from the first direction, and is welded to the second region together with the separator. ing. Thereby, a short circuit between electrode plates can be prevented while avoiding an increase in cost due to an increase in the number of parts.

  In the storage module of the present invention, the material of the separator and the material of the resin portion may have compatibility. In this case, the resin portion and the separator can be reliably welded to the electrode plate by forming a region in which the resin portion and the separator are compatible with each other. As a result, a short circuit can be reliably prevented.

  In the method of manufacturing a storage module according to the present invention, a preparation step of preparing a bipolar electrode having an electrode plate having a first surface and an active material layer formed on the first surface, and facing the first surface A first disposing step of disposing the separator on the first surface, a second disposing step of disposing the resin portion so as to face the first surface, and a welding step of welding the separator and the resin portion on the first surface, The surface includes a first region in which the active material layer is formed, and a second region exposed and roughened from the active material layer outside the first region, and in the first arrangement step, The separator is disposed so as to extend from the first area and overlap the second area as viewed from the first direction intersecting the first surface, and in the second arrangement step, the separator and the second area as viewed from the first direction. Place the resin part so that it overlaps Welding the separator and the resin portion in the second region.

  According to this method for manufacturing a power storage module, the above-described power storage module can be manufactured.

  ADVANTAGE OF THE INVENTION According to this invention, the electrical storage module which can prevent a short circuit while avoiding increase in cost, and the manufacturing method of an electrical storage module can be provided.

It is a schematic sectional drawing which shows one Embodiment of an electrical storage apparatus. It is a schematic sectional drawing which shows the internal structure of the electrical storage module shown by FIG. FIG. 3 is an enlarged view of a portion of the storage module shown in FIG. 2;

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and redundant description will be omitted.

  FIG. 1 is a schematic cross-sectional view showing an embodiment of a power storage device. The storage device 1 shown in FIG. 1 is used, for example, as a battery of various vehicles such as a forklift, a hybrid car, and an electric car. The power storage device 1 includes a module stack 2 including a plurality of power storage modules 4 stacked on one another, and a constraining member 3 that applies a constraint load to the module stack 2 in the stacking direction.

  The module stack 2 includes a plurality of (here, three) storage modules 4 and a plurality (here, four) conductive plates 5. The storage module 4 is a bipolar battery, and has a rectangular shape when viewed from the stacking direction. The storage module 4 is, for example, a nickel-hydrogen secondary battery, a secondary battery such as a lithium ion secondary battery, or an electric double layer capacitor. The following description exemplifies a nickel-hydrogen secondary battery.

  The storage modules 4 adjacent to each other in the stacking direction are electrically connected via the conductive plate 5. The conductive plates 5 are respectively disposed between the storage modules 4 adjacent to each other in the stacking direction and at the outside of the storage modules 4 located at the stacking end. The positive electrode terminal 6 is connected to one of the conductive plates 5 disposed on the outer side of the storage module 4 located at the lamination end. The negative electrode terminal 7 is connected to the other conductive plate 5 disposed outside the power storage module 4 located at the stacking end. The positive electrode terminal 6 and the negative electrode terminal 7 are drawn out, for example, from the edge of the conductive plate 5 in the direction crossing the stacking direction. Charging and discharging of the power storage device 1 are performed by the positive electrode terminal 6 and the negative electrode terminal 7.

  Inside the conductive plate 5, a plurality of flow paths 5 a for circulating a refrigerant such as air are provided. The flow path 5 a extends, for example, along a direction intersecting (orthogonal to) the stacking direction and the drawing direction of the positive electrode terminal 6 and the negative electrode terminal 7. The conductive plate 5 has a function as a connecting member for electrically connecting the storage modules 4 to each other, and as a heat sink for radiating heat generated by the storage module 4 by circulating a refrigerant through the flow paths 5a. It also has a function. In the example of FIG. 1, although the area of the conductive plate 5 viewed from the stacking direction is smaller than the area of the storage module 4, the area of the conductive plate 5 is the area of the storage module 4 from the viewpoint of improving heat dissipation. And may be larger than the area of the storage module 4.

  The restraint member 3 is configured by a pair of end plates 8 sandwiching the module stack 2 in the stacking direction, and a fastening bolt 9 and a nut 10 fastening the end plates 8 to each other. The end plate 8 is a rectangular metal plate having an area slightly larger than the areas of the storage module 4 and the conductive plate 5 as viewed in the stacking direction. On the inner side surface of the end plate 8 (surface on the module laminate 2 side), a film F having electrical insulation is provided. The film F insulates between the end plate 8 and the conductive plate 5.

  At the edge of the end plate 8, an insertion hole 8 a is provided at a position outside the module stack 2. The fastening bolt 9 is passed from the insertion hole 8a of one end plate 8 toward the insertion hole 8a of the other end plate 8, and the tip portion of the fastening bolt 9 protrudes from the insertion hole 8a of the other end plate 8 , The nut 10 is screwed. As a result, the storage module 4 and the conductive plate 5 are sandwiched by the end plates 8 to be unitized as the module stack 2, and a restraining load is applied to the module stack 2 in the stacking direction.

  Next, the configuration of the storage module 4 will be described in detail. FIG. 2 is a schematic cross-sectional view showing an internal configuration of the storage module shown in FIG. As shown in FIG. 2, the storage module 4 includes an electrode stack (stack) 11, and a resin sealing body 12 that seals the electrode stack 11. The electrode stack 11 includes a plurality of electrodes (a plurality of bipolar electrodes 14, a single negative electrode) stacked one on another along a stacking direction D (first direction) via a plurality of separators 13 and a plurality of separators 13. A termination electrode 18 and a single positive electrode termination electrode 19) are included. Here, the stacking direction D of the electrode stack 11 coincides with the stacking direction of the module stack 2. The electrode stack 11 has side surfaces 11 a extending in the stacking direction D. The stacking direction D intersects a first surface 15 a described later.

  The bipolar electrode 14 includes an electrode plate 15, a positive electrode 16 provided on the first surface 15 a of the electrode plate 15, and a negative electrode 17 provided on the second surface 15 b opposite to the first surface 15 a of the electrode plate 15. The positive electrode 16 is a positive electrode active material layer formed by applying a positive electrode active material to the electrode plate 15. The negative electrode 17 is a negative electrode active material layer formed by applying a negative electrode active material to the electrode plate 15. In the electrode stack 11, the positive electrode 16 of one bipolar electrode 14 faces the negative electrode 17 of another bipolar electrode 14 adjacent in the stacking direction D across the separator 13. In the electrode stack 11, the negative electrode 17 of one bipolar electrode 14 faces the positive electrode 16 of another bipolar electrode 14 adjacent in the stacking direction D across the separator 13. That is, in the bipolar electrode 14, the positive electrode 16 and the negative electrode 17 are alternately arranged along the stacking direction D and stacked one on another.

  The negative electrode termination electrode 18 includes an electrode plate 15 and a negative electrode 17 provided on the second surface 15 b of the electrode plate 15. The negative electrode termination electrode 18 is disposed at one end in the stacking direction D so that the second surface 15b is inside the electrode stack 11 (center side in the stacking direction D). The negative electrode 17 of the negative electrode terminal electrode 18 is opposed to the positive electrode 16 of the bipolar electrode 14 at one end in the stacking direction D via the separator 13. The positive electrode terminal electrode 19 includes an electrode plate 15 and a positive electrode 16 provided on a first surface 15 a of the electrode plate 15. The positive electrode terminal electrode 19 is disposed at the other end in the stacking direction D such that the first surface 15 a thereof is inside the electrode stack 11. The positive electrode 16 of the positive electrode terminal electrode 19 is opposed to the negative electrode 17 of the bipolar electrode 14 at the other end in the stacking direction D via the separator 13.

  The conductive plate 5 is in contact with the first surface 15 a of the electrode plate 15 of the negative electrode termination electrode 18. The other conductive plate 5 adjacent to the storage module 4 is in contact with the second surface 15 b of the electrode plate 15 of the positive electrode terminal electrode 19. The restraint load from the restraint member 3 is applied to the electrode stack 11 from the negative electrode termination electrode 18 and the positive electrode termination electrode 19 via the conductive plate 5.

  The electrode plate 15 is made of, for example, a metal such as a nickel or nickel plated steel plate. As an example, the electrode plate 15 is a rectangular metal foil made of nickel. An edge portion of the electrode plate 15 (edge portion of the bipolar electrode 14, the negative electrode termination electrode 18, and the positive electrode termination electrode 19) 15c has a rectangular frame shape, and a positive electrode active material and a negative electrode active material are not coated It has become. As a positive electrode active material which comprises the positive electrode 16, nickel hydroxide is mentioned, for example. As a negative electrode active material which comprises the negative electrode 17, a hydrogen storage alloy is mentioned, for example. In the present embodiment, the formation region of the negative electrode 17 on the second surface 15 b of the electrode plate 15 is slightly larger than the formation region of the positive electrode 16 on the first surface 15 a of the electrode plate 15.

  The separator 13 is disposed between the bipolar electrodes 14 adjacent along the stacking direction D. The separator 13 is interposed at least between the positive electrode 16 and the negative electrode 17 of the bipolar electrode 14 adjacent to each other along the stacking direction D. Here, the separator 13 is disposed between the negative electrode 17 of the negative electrode terminal electrode 18 and the positive electrode 16 of the bipolar electrode 14 adjacent to the negative electrode terminal electrode 18, the positive electrode 16 of the positive electrode terminal electrode 19, and the positive electrode terminal electrode 19. It is also interposed between the negative electrode 17 of the bipolar electrode 14 adjacent thereto.

  The separator 13 is formed in, for example, a sheet shape. Examples of the separator 13 include porous films made of polyolefin resins such as polyethylene (PE) and polypropylene (PP). The separator 13 may be reinforced with a vinylidene fluoride resin compound.

  The sealing body 12 is formed in a rectangular cylinder as a whole, for example, with an insulating resin. The sealing body 12 is provided on the side surface 11a of the electrode laminate 11 so as to surround the edge portion 15c. The sealing body 12 holds the edge 15 c at the side surface 11 a. The sealing body 12 surrounds the first resin portion 21 from the outside along the plurality of first resin portions (a plurality of resin portions) 21 welded to the edge portion 15 c and the side surface 11 a to form the first resin portion 21. And a single second resin portion 22 joined.

  The first resin portion 21 is provided to form an internal space (space) V between the adjacent bipolar electrodes 14 along the stacking direction D and to seal the internal space V. Specifically, when viewed in the stacking direction D, the first resin portion 21 has a rectangular annular shape, and is continuously provided over the entire circumference of the edge portion 15 c. The first resin portion 21 is welded to the first surface 15a of the electrode plate 15 and is airtightly joined. The first resin portion 21 is welded, for example, by ultrasonic waves or heat. The first resin portion 21 is a film having a predetermined thickness (length in the stacking direction D). The end face of the electrode plate 15 is exposed from the first resin portion 21. A part of the inside of the first resin portion 21 is located between the edge portions 15c of the electrode plates 15 adjacent to each other in the stacking direction D, and a part of the outside protrudes from the electrode plate 15 to the outside . The first resin portion 21 is embedded in the second resin portion 22 at a part of the outside. The first resin portions 21 adjacent to each other along the stacking direction D are separated from each other.

  The second resin portion 22 is provided outside the electrode stack 11 and the first resin portion 21, and constitutes an outer wall (housing) of the storage module 4. The second resin portion 22 is formed, for example, by injection molding of a resin, and extends along the stacking direction D along the entire length of the electrode stack 11. The second resin portion 22 has a cylindrical shape (annular shape) extending with the stacking direction D as the axial direction. The second resin portion 22 is welded (joined) to the outer surface of the first resin portion 21 by, for example, heat at the time of injection molding.

  The second resin portion 22 is, together with the first resin portion 21, between the bipolar electrodes 14 adjacent to each other along the stacking direction D, between the negative electrode terminal electrode 18 and the bipolar electrode 14 adjacent to each other along the stacking direction D, And between the positive electrode terminal electrode 19 and the bipolar electrode 14 which mutually adjoin along the lamination direction D, it each seals. As a result, an airtightly partitioned internal space V is formed between the bipolar electrode 14, between the negative electrode termination electrode 18 and the bipolar electrode 14, and between the positive electrode termination electrode 19 and the bipolar electrode 14. There is. In the internal space V, for example, an electrolytic solution (not shown) made of an alkaline aqueous solution such as a potassium hydroxide aqueous solution is accommodated. The electrolytic solution is impregnated in the separator 13, the positive electrode 16, and the negative electrode 17.

  The first resin portion 21 and the second resin portion 22 are, for example, insulating resins, and may be made of polypropylene (PP), polyphenylene sulfide (PPS), modified polyphenylene ether (modified PPE), or the like.

  FIG. 3 is an enlarged view of a portion of the storage module shown in FIG. As shown in FIG. 3, the first surface 15 a of the electrode plate 15 is a first area 15 d on which the positive electrode (active material layer) 16 is formed, and a second area exposed from the positive electrode 16 outside the first area 15 d. Region 15e. The outer shape of the first region 15 d is defined by the outer shape of the positive electrode 16. As an example, the positive electrode 16 is formed in a rectangular shape when viewed from the stacking direction D. Therefore, the outer shape of the first region 15d is, for example, rectangular. The second region 15 e is one of the outer surfaces of the edge portion 15 c of the electrode plate 15. Therefore, the outer shape of the second region 15 e is defined by the outer shape of the electrode plate 15. As an example, when viewed from the stacking direction D, the outer shape of the electrode plate 15 is rectangular. Therefore, the outer shape of the second region 15e is, for example, rectangular. The second region 15e is provided over the entire circumference of the edge 15c. Therefore, the second region 15e has, for example, a rectangular annular shape as a whole.

  The second surface 15b of the electrode plate 15 includes a third region 15f in which the negative electrode (active material layer) 17 is formed, and a fourth region 15g exposed from the negative electrode 17 outside the third region 15f. The outer shape of the third region 15 f is defined by the outer shape of the negative electrode 17. As an example, the negative electrode 17 is formed in a rectangular shape when viewed from the stacking direction D. Therefore, the outer shape of the third region 15f is, for example, rectangular. The fourth region 15 g is the other outer surface of the edge 15 c of the electrode plate 15. Therefore, the outer shape of the fourth region 15 g is defined by the outer shape of the electrode plate 15. Therefore, the outer shape of the fourth region 15g is, for example, rectangular. The fourth region 15g is provided over the entire circumference of the edge 15c. Therefore, the fourth region 15g has, for example, a rectangular annular shape as a whole.

  As described above, in the electrode plate 15, the formation region of the negative electrode 17 is larger than the formation region of the positive electrode 16. In other words, the size of the first region 15d and the size of the third region 15f are different from each other. Further, the size of the second region 15e and the size of the fourth region 15g are different from each other. Here, the first area 15d is smaller than the third area 15f, and the second area 15e is larger than the fourth area 15g.

  The separator 13 extends from the first area 15 d to the second area 15 e as viewed in the stacking direction D. However, the separator 13 does not reach the outer edge of the second region 15e. The first resin portion 21 is disposed so as to overlap the separator 13 and the second region 15 e as viewed in the stacking direction D. The first resin portion 21 overlaps the outer edge of the second region 15e. A portion on the center side of the first resin portion 21 is disposed in the second region 15 e via the edge 13 c of the separator 13.

  The edge 13 c of the separator 13 and the first resin portion 21 (except for the outermost first resin portion 21 on the negative electrode terminal electrode 18 side) are partially overlapped with each other as viewed in the stacking direction D, and the second region 15 e It is welded to Here, the material of the separator 13 and the material of the first resin portion 21 have compatibility. In FIG. 3, the boundary line between the edge 13c of the separator 13 and the first resin portion 21 is shown. In practice, however, the edge 13c and the first resin portion 21 are melted together. And may not have clear boundaries.

  The second region 15e is roughened. Here, the entire surface of the electrode plate 15 including the first surface 15a, the second surface 15b, and the end surface is roughened. The surface of the electrode plate 15 is roughened by forming a plurality of protrusions 15p by, for example, electrolytic plating. When the electrode plate 15 is roughened as described above, the separator 13 and the first resin portion 21 in a molten state are formed by roughening at the bonding interface between the electrode plate 15 and the separator 13 and the first resin portion 21. It enters into the recessed part and the anchor effect is exhibited. Thereby, the coupling | bonding force with the electrode plate 15, the separator 13, and the 1st resin part 21 can be improved. The protrusion 15p has, for example, a shape that tapers from the proximal end side toward the distal end side. In this case, the cross-sectional shape between the adjacent protrusions 15p is an undercut shape, and an anchor effect is likely to occur. FIG. 3 is a schematic diagram, and the shape and density of the protrusions 15p are not particularly limited.

  As described above, in the storage module 4, the electrode plate 15 of the bipolar electrode 14 is exposed from the positive electrode 16 outside the first region 15 d and the first region 15 d and roughened in the second region 15 e And a first surface 15a. Further, the separator 13 extends so as to overlap the second region 15 e when viewed in the stacking direction D. Moreover, the first resin portion 21 for forming the internal space V between the bipolar electrodes 14 and sealing the internal space V is disposed so as to overlap the separator 13 and the second region 15 e when viewed from the stacking direction D. And is welded to the second region 15 e together with the separator 13. Thereby, a short circuit between the electrode plates 15 can be prevented while avoiding an increase in cost due to an increase in the number of parts.

  Further, in the storage module 4, the material of the separator 13 and the material of the first resin portion 21 have compatibility. In this case, the first resin portion 21 and the separator 13 can be reliably welded to the electrode plate 15 by forming a region in which the first resin portion 21 and the separator 13 are compatible with each other. As a result, a short circuit can be reliably prevented.

  Subsequently, an example of a method of manufacturing power storage device 1 will be described. In this method, first, the above storage module 4 is manufactured. The method of manufacturing the storage module 4 includes a primary molding process (primary sealing process, sealing process), a lamination process, a secondary molding process (secondary sealing process, sealing process), and an injection process. .

  In the primary molding process, a predetermined number of bipolar electrodes 14, a negative electrode terminal electrode 18 and a positive electrode terminal electrode 19 are prepared, and the first resin portion 21 is welded to the first surface 15a of the edge 15c of each electrode plate 15. Specifically, the primary forming step has a preparation step, a first arrangement step, a second arrangement step, and a welding step. First, a predetermined number of bipolar electrodes 14, a negative electrode termination electrode 18, and a positive electrode termination electrode 19 are prepared (preparation step). Subsequently, the separator 13 is disposed so as to face the first surface 15 a of the bipolar electrode 14 and the electrode plate 15 of the positive electrode terminal electrode 19 (first arrangement step). Specifically, viewed from the stacking direction D, the separator 13 is disposed so as to extend from the first region 15 d and overlap the second region 15 e.

  Subsequently, the separator 13 is welded to the first surface 15a (welding step). Specifically, the edge 13c of the separator 13 is welded to the second region 15e. Subsequently, the first resin portion 21 is arranged so as to face the first surface 15a (second arrangement step). Specifically, as viewed in the stacking direction D, the first resin portion 21 is disposed so as to overlap the separator 13 and the second region 15 e. Here, the 1st resin part 21 is arrange | positioned so that it may overlap with the edge part 13c of the separator 13 at least. Then, the 1st resin part 21 is welded to the 1st surface 15a (welding process). Specifically, the first resin portion 21 is welded to the second region 15e. At this time, the first resin portion 21 is welded to the second region 15e while being melted with the edge portion 13c of the separator 13 welded to the second region 15e.

  The first resin portion 21 welded to the negative electrode terminal electrode 18 overlaps the first resin portion 21 welded to the bipolar electrode 14 or the positive electrode terminal electrode 19 as viewed in the stacking direction D, Is welded to the first surface 15a of For welding in the present embodiment, for example, laser welding, thermal welding, ultrasonic welding, or the like can be used.

  In the laminating step, the first resin portion 21 is disposed between the edge portions 15 c of the electrode plate 15, and the positive electrode 16 and the negative electrode 17 are alternately arranged along the laminating direction D while interposing the separator 13. The electrode stack 11 is formed by laminating the bipolar electrode 14, the negative electrode terminal electrode 18, and the positive electrode terminal electrode 19 as shown in FIG.

  In the secondary molding step, the electrode laminate 11 is placed in a mold (not shown) for injection molding, and then a molten resin is injected into the mold. Thus, the second resin portion 22 is provided so as to surround the first resin portion 21. Thereby, the sealing body 12 is formed on the side surface 11 a of the electrode stack 11. In the injection step, the electrolytic solution is injected into the internal space V after the secondary forming step. Thereby, the electrical storage module 4 is obtained.

  Thereafter, the obtained power storage module 4 and the conductive plate 5 are stacked to form the module stack 2, and the power storage device 1 is manufactured through steps such as restraining the module stack 2 by the restraint member 3.

  As described above, according to the method of manufacturing a storage module, the storage module 4 can be manufactured.

  Although one embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment.

  In the above embodiment, the separator 13 interposed between the positive electrode 16 of one bipolar electrode 14 and the negative electrode 17 of another bipolar electrode 14 adjacent to the one bipolar electrode 14 is the first separator of the one bipolar electrode 14. The example welded with the 1st resin part 21 to the 2nd field 15e of 1 side 15a was explained. However, the separator 13 interposed between the positive electrode 16 of one bipolar electrode 14 and the negative electrode 17 of another bipolar electrode 14 adjacent to the one bipolar electrode 14 is the second surface 15 b of the other bipolar electrode 14. It may be welded together with the first resin portion 21 to the fourth region 15g. That is, the second surface 15b in the above embodiment can be read as the first surface, and each of the third area 15f and the fourth area 15g can be read as the first area and the second area.

  Further, although an example is shown in which the entire surface of the electrode plate 15 including the first surface 15a, the second surface 15b, and the end surface is roughened, at least the second region 15e may be roughened. Also in this case, the effect of improving the bonding strength can be obtained.

  Further, the material of the separator 13 and the material of the first resin portion 21 may not have compatibility. The material of the separator 13 may be a woven or non-woven fabric made of polypropylene, polyethylene terephthalate (PET), methyl cellulose or the like. Further, the first resin portion 21 may be made of an elastic material such as, for example, an elastomer, modified PPE, or acid-modified PP.

  In the method of manufacturing the storage module, although the first resin portion 21 is disposed after the separator 13 is welded to the second region 15 e and the second resin region 15 e is welded, the separator 13 and the first resin portion are illustrated. After arranging 21, the separator 13 and the first resin portion 21 may be simultaneously welded to the second region 15 e. At this time, the order of arrangement of the separator 13 and the first resin portion 21 is not limited. After disposing the separator 13, the first resin portion 21 may be disposed, or after disposing the first resin portion 21, the separator 13 may be disposed. That is, the first arrangement step and the second arrangement step may be interchanged.

  4 storage module 13 separator 14 bipolar electrode 15 electrode plate 15a first surface 15d first region 15e second region 16 positive electrode (active material layer) 21 first Resin part (resin part), D ... stacking direction (first direction), V ... internal space (space).

Claims (3)

A plurality of bipolar electrodes stacked along the first direction;
A plurality of separators disposed between the adjacent bipolar electrodes along the first direction;
A plurality of resin portions for forming a space between the adjacent bipolar electrodes along the first direction and sealing the space;
With
The bipolar electrode includes an electrode plate having a first surface, and an active material layer formed on the first surface,
The first surface includes a first region in which the active material layer is formed, and a second region that is exposed from the active material layer and roughened outside the first region,
The separator extends from the first area to overlap the second area as viewed in the first direction,
The resin portion is disposed so as to overlap the separator and the second region when viewed from the first direction,
The separator and the resin portion are welded to the second region,
Power storage module. The material of the separator and the material of the resin portion are compatible with each other,
The power storage module according to claim 1. Preparing a bipolar electrode having an electrode plate having a first surface and an active material layer formed on the first surface;
Arranging a separator so as to face the first surface;
A second disposing step of disposing a resin portion so as to face the first surface;
A welding step of welding the separator and the resin portion to the first surface;
With
The first surface includes a first region in which the active material layer is formed, and a second region that is exposed from the active material layer and roughened outside the first region,
In the first arrangement step, the separator is arranged so as to extend from the first region and overlap the second region as seen from the first direction intersecting the first surface,
In the second disposing step, the resin portion is disposed so as to overlap the separator and the second region when viewed from the first direction,
In the welding step, the separator and the resin portion are welded to the second region,
A method for manufacturing a power storage module.

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