JP2018106962A - Power storage module and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power storage module which can suppress occurrence of wrinkle and warp of an electrode plate and a manufacturing method of the power storage module.SOLUTION: A power storage module 12 includes a bipolar electrode 32 composed of an electrode plate 34 having a positive electrode 36 formed on one surface 34a and a negative electrode 38 formed on the other surface 34b. The power storage module 12 includes a laminate 30 formed by laminating the bipolar electrodes 32 via a separator 40 and a frame body 50 for holding an edge portion 35 of the electrode plate 34 on a side face 30a of the laminate 30 formed by stacking the bipolar electrodes 32. The frame body 50 includes a first portion 52 disposed at least between the edge portions 35 of the electrode plate 34 and a second portion 54 surrounding the first portion 52 from the outside along the side face 30a of the laminate 30. The first portion 52 includes a resin portion 62 coupled to the edge portion 35 of the electrode plate 34 and a core portion 64 having a thermal expansion coefficient smaller than the thermal expansion coefficient of the resin portion 62.SELECTED DRAWING: Figure 3

Description

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

  As a conventional power storage module, a bipolar battery including a bipolar electrode in which a positive electrode is formed on one surface of an electrode plate and a negative electrode is formed on the other surface is known (see Patent Document 1). The bipolar battery is provided with a laminate formed by laminating a plurality of bipolar electrodes via a separator. The laminated body is provided with a sealing frame made of resin, and the edge of the electrode plate is held on the side surface formed by the lamination of the bipolar electrodes.

JP 2011-204386 A

  As a method of manufacturing the power storage module as described above, for example, a part of the frame is formed in advance on the edge of each electrode plate, and the part is positioned between the edges of the electrode plates. A method of forming the remaining part of the frame so as to surround the part from the outside after the bipolar electrodes are stacked is conceivable. However, in such a case, there is a concern that when the part of the frame is welded to the edge of the electrode plate, the part is thermally contracted, thereby causing wrinkles or warpage in the electrode plate. The wrinkles and warpage of the electrode plates may induce a short circuit between adjacent electrode plates.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a power storage module and a method for manufacturing the power storage module that can suppress generation of wrinkles and warpage of an electrode plate.

  An electricity storage module according to one aspect of the present invention is an electricity storage module having a bipolar electrode composed of an electrode plate having a positive electrode formed on one surface side and a negative electrode formed on the other surface side. A laminated body formed by laminating, and a frame body that holds an edge portion of the electrode plate on a side surface of the laminated body formed by laminating bipolar electrodes, and the frame body is at least between the edge portions of the electrode plate. A first portion disposed, and a second portion surrounding the first portion from the outside along the side surface of the laminate, the first portion including a resin portion coupled to an edge of the electrode plate, and a resin And a core part having a thermal expansion coefficient smaller than the thermal expansion coefficient of the part.

  In this power storage module, at least the first portion of the frame disposed between the edge portions of the electrode plates is added to the resin portion coupled to the edge portions of the electrode plates, and the thermal expansion coefficient of the resin portion. Includes a core part having a small thermal expansion coefficient. Thereby, compared with the case where the whole 1st part consists of resin, the thermal contraction amount of the 1st part at the time of welding can be reduced, and generation | occurrence | production of the wrinkles and curvature of an electrode plate can be suppressed.

  The rigidity of the core part may be larger than the rigidity of the resin part. In this case, generation | occurrence | production of the curvature of an electrode plate can be suppressed further according to the rigidity of a core material part.

  The core material part may be comprised with the nonwoven fabric. In this case, generation of wrinkles and warpage of the electrode plate can be suppressed by the core portion formed of the nonwoven fabric.

  The core member may be made of metal. In this case, generation of wrinkles and warpage of the electrode plate can be suppressed by the core portion made of metal.

  The core part may be formed in parallel with the electrode plate and in layers. In this case, generation | occurrence | production of the wrinkles and curvature of an electrode plate can be suppressed further.

  The core part may be provided so as to be sandwiched between the resin parts. In this case, generation | occurrence | production of the wrinkles and curvature of an electrode plate can be suppressed further.

  The core part may be provided on the resin part. In this case, generation | occurrence | production of the wrinkles and curvature of an electrode plate can be suppressed further.

  The resin part and the core part may be provided on each of the one side and the other side of the electrode plate. In this case, the thermal contraction amount of the first portion can be reduced on each of the one surface side and the other surface side of the electrode plate, and wrinkles and warpage of the electrode plate can be further suppressed.

  The core part is made of metal and is provided so as to sandwich the resin part between the electrode plate, the bonding surface with the resin part in the electrode plate, and the bonding surface with the resin part in the core material part are: It may be a roughened surface. In this case, the warp due to the heat shrinkage at the bonding surface between the electrode plate and the resin portion and the warpage at the bonding surface between the core material portion and the resin portion can be offset, and wrinkles and warpage of the electrode plate can be prevented. It can be further suppressed.

  A method for manufacturing a power storage module according to one aspect of the present invention is formed by a bipolar electrode laminate including an electrode plate in which a positive electrode is formed on one side and a negative electrode is formed on the other side, and a laminate of bipolar electrodes. A frame body that holds the edge portion of the electrode plate on the side surface of the laminated body, and a primary forming step of forming a first portion of the frame body on the edge portion of the electrode plate, By laminating the bipolar electrodes so that the first part is disposed between the edges of the electrode plates, a laminating step for obtaining a laminated body, and the first part along the side surface of the laminated body among the frames. A second molding step for forming a second portion surrounding from the outside, wherein the first molding step includes a resin portion and a core portion having a thermal expansion coefficient smaller than that of the resin portion. On the edge of the electrode plate in the resin part. To.

  In this method of manufacturing the electricity storage module, in the primary molding step, the resin part and the first part including the core part having a coefficient of thermal expansion smaller than the coefficient of thermal expansion of the resin part are used. Weld to the part. Thereby, compared with the case where the whole 1st part consists of resin, the thermal contraction amount of the 1st part at the time of welding can be reduced, and generation | occurrence | production of the wrinkles and curvature of an electrode plate can be suppressed.

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of the electrical storage module and electrical storage module which can suppress generation | occurrence | production of the wrinkles and curvature of an electrode plate can be provided.

It is a schematic sectional drawing of one Embodiment of an electrical storage apparatus provided with an electrical storage module. It is a schematic sectional drawing of the electrical storage module of FIG. It is the schematic sectional drawing to which the 1st part of FIG. 2 was expanded. It is a schematic sectional drawing of the 1st part of the electrical storage module which concerns on a 1st modification. (A) And (b) is a schematic sectional drawing of the 1st part of the electrical storage module which concerns on a 2nd modification and a 3rd modification. It is a schematic sectional drawing of the 1st part of the electrical storage module which concerns on a 4th modification.

  Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings. In the following description, the same or equivalent elements will be denoted by the same reference numerals, and redundant description will be omitted. In the drawing, an XYZ orthogonal coordinate system is shown.

  The power storage device 10 shown in FIG. 1 is used as a battery for various vehicles such as forklifts, hybrid vehicles, and electric vehicles. The power storage device 10 includes a plurality (three in the present embodiment) of power storage modules 12, but may include a single power storage module 12. The power storage module 12 is, for example, a bipolar battery. The power storage module 12 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 12 are stacked via a conductive plate 14 such as a metal plate. When viewed from the stacking direction, the power storage module 12 and the conductive plate 14 have, for example, a rectangular shape. Details of the power storage module 12 will be described later. The conductive plates 14 are also arranged outside the power storage modules 12 located at both ends in the stacking direction (Z direction) of the power storage modules 12. The conductive plate 14 is electrically connected to the adjacent power storage module 12. Thereby, the some electrical storage module 12 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. The positive terminal 24 may be integrated with the conductive plate 14 to be connected. The negative electrode 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 (X direction) intersecting the stacking direction. The positive and negative terminals 24 and 26 can charge and discharge the power storage device 10.

  The conductive plate 14 can also function as a heat radiating plate for releasing heat generated in the power storage module 12. When a refrigerant such as air passes through the plurality of gaps 14a provided inside the conductive plate 14, heat from the power storage module 12 can be efficiently released to the outside. Each gap 14a extends, for example, in a direction (Y direction) intersecting the stacking direction. When viewed from the stacking direction, the conductive plate 14 is smaller than the power storage module 12, but may be the same as or larger than the power storage module 12.

  The power storage device 10 includes a restraining member 16 that restrains alternately stacked power storage modules 12 and conductive plates 14 in the stacking direction. The restraining member 16 includes a pair of restraining plates 17 and 17 and a connecting member (bolt 18 and nut 20) that joins the restraining plates 17 and 17 together. An insulating film 22 such as a resin film is disposed between each restraint plate 17 and the conductive plate 14. Each constraining plate 17 is made of a metal such as iron.

  When viewed from the stacking direction, each restraint plate 17 and the insulating film 22 have, for example, a rectangular shape. The insulating film 22 is larger than the conductive plate 14, and each restraint plate 17 is larger than the power storage module 12. An insertion hole 17 a 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 12 at the edge portion of each restraint plate 17. When each restraint plate 17 has a rectangular shape, the insertion hole 17 a is positioned at a corner of the restraint plate 17.

  One constraining plate 17 is abutted against the conductive plate 14 connected to the positive terminal 24 via the insulating film 22, and the other constraining plate 17 applies the insulating film 22 to the conductive plate 14 connected to the negative terminal 26. Has been hit through. For example, the bolt 18 is passed through the insertion hole 17a from the other restraint plate 17 side toward the one restraint plate 17 side, and a nut 20 is screwed onto the tip of the bolt 18 protruding from the one restraint plate 17. Has been. Thereby, the insulating film 22, the conductive plate 14, and the power storage module 12 are sandwiched and unitized, and a restraining load is applied in the stacking direction.

  As shown in FIG. 2, the power storage module 12 includes a laminated body 30 of bipolar electrodes 32 and a frame body 50 that holds the laminated body 30. The stacked body 30 is configured by stacking a plurality of bipolar electrodes 32 with a separator 40 interposed therebetween. The stacking direction of the bipolar electrode 32 coincides with the stacking direction of the power storage module 12. The bipolar electrode 32 is an electrode composed of an electrode plate 34 having a positive electrode 36 formed on one side 34a and a negative electrode 38 formed on the other side 34b. 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. Each of the terminal electrode plates 34 is connected to the adjacent conductive plate 14 (see FIG. 1).

  The electrode plate 34 is a rectangular metal foil made of nickel, for example. The edge 35 of the electrode plate 34 is an uncoated region where the positive electrode active material and the negative electrode active material are not coated. 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 other surface 34 b of the electrode plate 34 is slightly larger than the formation region of the positive electrode 36 on the one surface 34 a of the electrode plate 34.

  The separator 40 is formed in a sheet shape, for example. Examples of the material forming the separator 40 include a porous film made of a polyolefin resin such as polyethylene (PE) and polypropylene (PP), a woven fabric or a non-woven fabric made of polypropylene, polyethylene terephthalate (PET), methylcellulose, and the like. . The separator 40 may be reinforced with a vinylidene fluoride resin compound. The separator 40 is not limited to a sheet shape, and may be a bag shape.

  The frame 50 has, for example, a rectangular cylindrical shape, and holds the edge portion 35 of the electrode plate 34 on the side surface 30a of the stacked body 30 formed by stacking the bipolar electrodes 32. The frame 50 includes a plurality of first portions 52 that respectively hold the edge portions 35 of the electrode plates 34, and a second portion 54 that surrounds the entire first portion 52 from the outside along the side surface 30a. Yes.

  The first portion 52 is provided on the edge 35 of the electrode plate 34 so as to extend over the one surface 34 a side and the other surface 34 b side of the electrode plate 34. The first portion 52 is provided over the entire circumference of the edge portion 35 of the electrode plate 34. As a result, the edge portion 35 of the electrode plate 34 of the bipolar electrode 32 is buried and held in the first portion 52. Similarly to the edge 35 of the electrode plate 34 of the bipolar electrode 32, the edge 35 of the electrode plate 34 disposed at both ends of the laminate 30 is also embedded and held in the first portion 52.

  The first portions 52 adjacent in the stacking direction are in contact with each other on the opposing surface. The second portion 54 seals the whole of the plurality of first portions 52 arranged in the stacking direction from the outside along the side surface 30a. As a result, an internal space that is airtightly partitioned by the electrode plates 34 and 34 and the frame body 50 is formed between the adjacent electrode plates 34 and 34. An electrolytic solution (not shown) made of an alkaline solution such as an aqueous potassium hydroxide solution is accommodated in the internal space.

  Next, the configuration of the first portion 52 described above will be described in more detail with reference to FIG.

  The first portion 52 has a first resin portion 62 coupled to the edge portion 35 of the electrode plate 34. The first resin portion 62 is provided across the one surface 34a side and the other surface 34b side of the electrode plate 34, and is coupled to the one surface 34a, the other surface 34b, and the end surface 34c of the electrode plate 34. That is, the edge portion 35 of the electrode plate 34 is buried and held in the first resin portion 62. A part of the inside of the first resin part 62 is located between the edge parts 35 of the electrode plate 34, and a part of the outside protrudes outward from the electrode plate 34. Each of the first surface 62 a and the second surface 62 b facing each other in the stacking direction in the first resin portion 62 is a flat surface parallel to the electrode plate 34.

  The first portion 52 further includes core parts 64, 64 provided over the first surface 62 a and the second surface 62 b of the first resin part 62, respectively. Each core part 64 is formed in layers in parallel with the electrode plate 34. The core parts 64 and 64 have the same thickness, for example.

  The first portion 52 further includes second resin portions 66 and 66 provided over the core portions 64 and 64, respectively. Each second resin portion 66 is formed in parallel and in layers with the electrode plate 34. The thickness of the second resin portion 66 disposed on the one surface 34a side with respect to the electrode plate 34 is thinner than, for example, the thickness of the second resin portion 66 disposed on the other surface 34b side.

  Thus, in this embodiment, the 1st resin part 62, the core part 64, and the 2nd resin part 66 are provided in the one surface 34a side and the other surface 34b side of the electrode plate 34, respectively. Each core member 64 is sandwiched between the first resin portion 62 and the second resin portion 66 in the stacking direction.

  The first resin portion 62 and the second resin portion 66 of the first portion 52 and the second portion 54 are made of an insulating resin such as polypropylene (PP), polyphenylene sulfide (PPS), or modified polyphenylene ether (modified PPE). It is formed by. For example, the second resin portion 66 is formed of the same resin material as that of the first resin portion 62, but may be formed of a resin material different from that of the first resin portion 62. The second portion 54 is also formed of the same resin material as the first resin portion 62, for example, but may be formed of a resin material different from the first resin portion 62.

The core part 64 is formed so as to have a thermal expansion coefficient smaller than that of the first resin part 62 and to have rigidity higher than that of the first resin part 62. Examples of the material constituting the core part 64 include non-woven fabric, metal, ceramic, or resin. As a nonwoven fabric which comprises the core material part 64, what consists of PA (polyamide), PPS (polyphenylene sulfide) etc. is illustrated, and what impregnated the nonwoven fabric with resin may be used. Examples of the metal constituting the core member 64 include nickel, and the same material as the electrode plate 34 may be used. For example, when the core material portion 64 is made of a nonwoven fabric made of PA and the first resin portion 62 is made of modified PPE, the thermal expansion coefficient of the core material portion 64 is −5 × 10 ⁻⁶ to −1 × 10. ⁻⁴ (1 / K), which is smaller than the thermal expansion coefficient of the first resin portion 62 from 1.5 × 10 ^{−4 to} 2.1 × 10 ⁻⁴ (1 / K).

  Then, the manufacturing method of the electrical storage module 12 mentioned above is demonstrated. First, the first portion 52 is formed on the edge portion 35 of the electrode plate 34 (primary forming step). In the primary molding step, the first portion 52 including the first resin portion 62 and the core portion 64 is prepared in advance, and the first portion 52 is melted and solidified to make the first portion 52 the first resin. The portion 62 is welded to the edge portion 35 of the electrode plate 34. Then, the laminated body 30 is obtained by laminating | stacking the some bipolar electrode 32 so that the 1st part 52 may be arrange | positioned between the edge parts 35 of the electrode plate 34 (lamination process). Then, the 2nd part 54 which surrounds the 1st part 52 from the outer side along the side surface 30a of the laminated body 30 is formed by injection molding (secondary molding process). Then, the electrical storage module 12 is obtained by sealing the said liquid injection port, after inject | pouring electrolyte solution into the internal space formed in the frame 50 from the liquid injection port (not shown).

  As described above, in the power storage module 12, the first portion 52 disposed at least between the edge portions 35 of the electrode plate 34 of the frame 50 is coupled to the edge portion 35 of the electrode plate 34. In addition to the first resin portion 62, a core material portion 64 having a thermal expansion coefficient smaller than that of the first resin portion 62 is included. Thereby, compared with the case where the whole 1st part 52 consists of resin, the thermal contraction amount of the 1st part 52 at the time of welding can be reduced, and generation | occurrence | production of the wrinkles and curvature of the electrode plate 34 can be suppressed.

  Further, in the power storage module 12, since the rigidity of the core part 64 is larger than the rigidity of the first resin part 62, the warpage of the electrode plate 34 can be further suppressed by the rigidity of the core part 64.

  Moreover, in the electrical storage module 12, the core material part 64 may be comprised with the nonwoven fabric or the metal, and generation | occurrence | production of the wrinkles and curvature of the electrode plate 34 can be suppressed by the core material part 64 comprised with the nonwoven fabric or the metal in this case. .

  Further, in the power storage module 12, since the core member 64 is formed in parallel and in layers with the electrode plate 34, generation of wrinkles and warpage of the electrode plate 34 can be further suppressed.

  Further, in the power storage module 12, since the core member portion 64 is provided so as to be sandwiched between the first resin portion 62 and the second resin portion 66, generation of wrinkles and warpage of the electrode plate 34 can be further suppressed.

  In the power storage module 12, the first resin portion 62 and the core material portion 64 are provided on each of the one surface 34 a side and the other surface 34 b side of the electrode plate 34. Thereby, the amount of thermal contraction of the first portion 52 can be reduced on each of the one surface 34a side and the other surface 34b side of the electrode plate 34, and the generation of wrinkles and warpage of the electrode plate 34 can be further suppressed.

  Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment. For example, the 2nd resin part 66 does not need to be provided like the 1st modification shown by FIG. In the first modification, each core member 64 on the first resin portion 62 is located on the outermost side in the stacking direction. The thickness of the core member 64 disposed on the one surface 34a side with respect to the electrode plate 34 is thinner than the thickness of the core member 64 disposed on the other surface 34b side. Also according to such a first modification, the amount of thermal contraction of the first portion 52 can be reduced and the occurrence of wrinkles and warping of the electrode plate 34 can be suppressed, as in the above embodiment. In addition, when the core member 64 is provided on the outermost side in the stacking direction as in the first modification, if the core member 64 is made of an insulating material, occurrence of a short circuit between the electrode plates 34 is caused. Can be suppressed.

  Moreover, the core part 64 may be embed | buried in the 1st resin part 62A like the 2nd modification shown by Fig.5 (a). In the second modification, the core member 64 is sandwiched in the stacking direction by the first resin portion 62A. Also according to the second modified example, the amount of thermal contraction of the first portion 52 can be reduced and the occurrence of wrinkles and warping of the electrode plate 34 can be suppressed as in the above embodiment.

  5B, the first resin portion 62, the core member portion 64, and the second resin portion 66 may be provided only on the one surface 34a side of the electrode plate 34. . In the third modification, the first resin portion 62B is coupled only to the one surface 34a and the end surface 34c of the electrode plate 34. Also according to the third modified example, the amount of thermal contraction of the first portion 52 can be reduced and the occurrence of wrinkles and warping of the electrode plate 34 can be suppressed, as in the above embodiment.

  Moreover, the 1st part 52 may be comprised like the 4th modification shown by FIG. The layer configuration of the first portion 52 in the fourth modification is the same as that in the first modification. In the fourth modification, each core member 64 is made of metal. The coupling surfaces 34d and 34d with the first resin part 62 in the electrode plate 34 and the coupling surface 64a with the first resin part 62 in the core member 64 are roughened surfaces. These roughened surfaces are provided with irregularities for promoting bonding with the resin during welding. These roughened surfaces can be formed by, for example, electrolytic plating.

  According to the fourth modified example, similarly to the above embodiment, the amount of heat shrinkage of the first portion 52 can be reduced, and the occurrence of wrinkles and warping of the electrode plate 34 can be suppressed. Furthermore, the warpage due to thermal contraction at the coupling surface 34d between the electrode plate 34 and the first resin portion 62 and the warpage at the coupling surface 64a between the core member portion 64 and the first resin portion 62 can be offset. Generation of wrinkles and warping of the electrode plate 34 can be further suppressed. In the fourth modification, the first resin portion 62 and the core member 64 may be provided only on the one surface 34a side of the electrode plate 34 as in the third modification. Even in this case, it is possible to cancel the warpage due to thermal contraction at the coupling surface 34d between the electrode plate 34 and the first resin portion 62 and the warpage at the coupling surface 64a between the core member portion 64 and the first resin portion 62. it can.

  In the above embodiment, a part of the outside of the first portion 52 protrudes outward from the electrode plate 34, but the first portion 52 only needs to be disposed at least between the edge portions 35 of the electrode plate 34, For example, the entire first portion 52 may be disposed between the edge portions 35 of the electrode plate 34.

DESCRIPTION OF SYMBOLS 12 ... Power storage module, 30 ... Laminated body, 30a ... Side surface, 32 ... Bipolar electrode, 34 ... Electrode plate, 34a ... One side, 34b ... Other side, 34d ... Binding surface, 35 ... Edge, 36 ... Positive electrode, 38 ... Negative electrode 40 ... Separator 50 ... Frame body 52 ... First part 54 ... Second part 62, 62A, 62B ... First resin part 64 ... Core part 64a ... Binding surface 66 ... Second resin Department.

Claims (10)

A power storage module having a bipolar electrode made of an electrode plate having a positive electrode formed on one side and a negative electrode formed on the other side,
A laminate formed by laminating the bipolar electrode via a separator;
A frame that holds the edge of the electrode plate on the side surface of the laminate formed by the lamination of the bipolar electrodes,
The frame body includes at least a first portion disposed between edges of the electrode plates, and a second portion surrounding the first portion from the outside along the side surface of the stacked body,
The first part includes a resin part coupled to an edge of the electrode plate, and a core part having a thermal expansion coefficient smaller than that of the resin part.   The power storage module according to claim 1, wherein the rigidity of the core part is greater than the rigidity of the resin part.   The power storage module according to claim 1, wherein the core member is made of a nonwoven fabric.   The power storage module according to claim 1, wherein the core part is made of metal.   The power storage module according to any one of claims 1 to 4, wherein the core portion is formed in parallel and in layers with the electrode plate.   The power storage module according to claim 1, wherein the core member is provided so as to be sandwiched between the resin portions.   The power storage module according to any one of claims 1 to 6, wherein the core part is provided on the resin part.   The power storage module according to any one of claims 1 to 7, wherein the resin portion and the core material portion are provided on each of the one surface side and the other surface side of the electrode plate. The core part is made of metal and is provided so as to sandwich the resin part between the electrode plate,
3. The power storage module according to claim 1, wherein a coupling surface with the resin portion in the electrode plate and a coupling surface with the resin portion in the core member portion are roughened surfaces. A bipolar electrode laminate comprising an electrode plate having a positive electrode on one side and a negative electrode on the other side, and an edge of the electrode plate on the side of the laminate formed by the lamination of the bipolar electrodes A method of manufacturing a power storage module comprising:
A primary forming step of forming the first portion of the frame on the edge of the electrode plate;
A lamination step of obtaining the laminate by laminating the bipolar electrode such that the first portion is disposed between edges of the electrode plates;
A secondary molding step of forming a second portion surrounding the first portion from the outside along the side surface of the laminated body of the frame body, and
In the primary molding step, the first part including a resin part and a core part having a thermal expansion coefficient smaller than the thermal expansion coefficient of the resin part is welded to an edge of the electrode plate in the resin part. The manufacturing method of an electrical storage module.

Images