JP2019106317A - Power storage module and method for manufacturing power storage module - Google Patents

Abstract

To provide a power storage module capable of suppressing deformation of an electrode laminate when a sealing body is formed, and a method for manufacturing a power storage module.SOLUTION: A power storage module 4 includes an electrode laminate 11 on which a plurality of bipolar electrodes 14 are laminated, and a sealing body 12 that seals a space between the adjacent bipolar electrodes 14 and 14 in a lamination direction on the electrode laminate 11, in which the sealing body 12 includes a group H of primary sealing bodies 21 provided on each edge part 15c of electrode plates 15 configuring the plurality of bipolar electrodes 14 and a secondary sealing body 22 bonding the group H of the primary sealing bodies 21, the group H of the primary sealing bodies 21 is configured of a plurality of resin materials having different coefficients of static frictions, and an outside surface Ha in the lamination direction of the primary sealing bodies 21 positioned on the lamination end in the lamination direction is formed of a resin material having the highest coefficient of static friction among the plurality of resin materials, in the group H of the primary sealing bodies 21.SELECTED DRAWING: Figure 6

Description

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

  As a conventional storage module, for example, there is a storage module described in Patent Document 1. This storage module is a so-called bipolar storage module 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. The storage module includes an electrode stack formed by stacking a plurality of bipolar electrodes via a separator. The sealing body which seals between the bipolar electrodes which adjoin in the lamination direction is provided in the side of an electrode laminated body.

JP, 2011-204386, A

  In forming the sealed body, for example, a primary sealed body is disposed at an edge portion of an electrode plate constituting a bipolar electrode, and a bipolar electrode having the primary sealed body is stacked to form an electrode stack. Thereafter, the primary sealing bodies of the respective bipolar electrodes are joined together by the secondary sealing body to form a sealing body. The secondary seal is formed, for example, by injection molding. At the time of injection molding, for example, a molten resin is injected to an electrode laminate disposed in a mold. At this time, if the pressure resistance of the electrode laminate against the injection pressure of the molten resin is insufficient, the electrode laminate may be deformed.

  The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a storage module and a method for manufacturing the storage module, which can suppress deformation of the electrode stack at the time of forming a sealing body.

  A storage module according to one aspect of the present invention includes an electrode stack body in which a plurality of bipolar electrodes are stacked, and a sealing body that seals between bipolar electrodes adjacent in the stacking direction in the electrode stack body, The body has a group of primary seals provided respectively at the edge of an electrode plate constituting a plurality of bipolar electrodes, and a secondary seal joining the group of primary seals, The group of stoppers is made of a plurality of resin materials having different coefficients of static friction, and in the group of primary seals, the outer surface of the primary sealing body located at the lamination end in the stacking direction is a plurality of resin materials Among them, it is made of a resin material having the highest coefficient of static friction.

  In this storage module, the outer surface in the stacking direction of the primary sealing body located at the stacking end in the stacking direction is made of the resin material having the highest static friction coefficient among the plurality of resin materials constituting the group of primary sealing bodies. It is done. When the secondary sealing body is formed by injection molding, the pressure resistance of the electrode laminate against the injection pressure of the molten resin is the compressive reaction force caused by the compressive force applied in the lamination direction of the electrode laminate by the mold, and gold It is defined by the product of the static friction coefficient of the outer surface in the stacking direction of the primary sealing body in contact with the mold. Therefore, by sufficiently securing the static friction coefficient of the outer surface of the primary sealing body in the stacking direction, it is possible to increase the withstand voltage of the electrode stack against the injection pressure of the molten resin, and the electrode stack at the time of forming the sealing body Can suppress the deformation of

  In a group of primary sealing bodies, when a resin material having the highest friction coefficient is used as the first resin material and a resin material other than the first resin material is used as the second resin material among a plurality of resin materials. The primary sealing body positioned at the lamination end in the lamination direction is formed in a single layer by the first resin material, and the primary sealing body positioned in the middle in the lamination direction is formed in a single layer by the second resin material It may be formed. In this case, it is possible to avoid the complication of the configuration of the electrode stack while enhancing the withstand voltage of the electrode stack.

  In a group of primary sealing bodies, when a resin material having the highest friction coefficient is used as the first resin material and a resin material other than the first resin material is used as the second resin material among a plurality of resin materials. The primary sealing body located at the lamination end of the lamination direction is formed in a single layer by the first resin material, and the primary sealing body located at the middle of the lamination direction is the first resin in order from the electrode plate side It may be formed in multiple layers by the material and the second resin material. In this case, it is possible to avoid the complication of the configuration of the electrode stack while enhancing the withstand voltage of the electrode stack.

  In the method of manufacturing a storage module according to one aspect of the present invention, an electrode including a primary sealed body-attached bipolar electrode formed by disposing a primary sealed body at an edge portion of an electrode plate constituting the bipolar electrode is stacked. An electrode laminate forming step of forming an electrode laminate, and placing the electrode laminate in a mold for injection molding so that a compressive force in the laminating direction is applied to the electrode laminate, and a molten resin in the die And a plurality of resin materials constituting the group of primary seals in the step of forming an electrode laminate, wherein the step of forming a secondary seal is performed to form a secondary seal that is injected to bond the group of primary seals. By forming the outer surface of the primary sealing body located at the lamination end in the laminating direction with the resin material having the highest coefficient of static friction among them, and pressing the outer surface with a mold in the sealing body forming step A compressive force is applied to the electrode stack.

  In this method of manufacturing a storage module, the outer surface of the primary sealing body located at the stacking end in the stacking direction is the resin having the highest coefficient of static friction among the plurality of resin materials constituting the group of primary sealing bodies. Composed of materials. When the secondary sealing body is formed by injection molding, the pressure resistance of the electrode laminate against the injection pressure of the molten resin is the compressive reaction force caused by the compressive force applied in the lamination direction of the electrode laminate by the mold, and gold It is defined by the product of the static friction coefficient of the outer surface in the stacking direction of the primary sealing body in contact with the mold. Therefore, by sufficiently securing the static friction coefficient of the outer surface of the primary sealing body in the stacking direction, it is possible to increase the withstand voltage of the electrode stack against the injection pressure of the molten resin, and the electrode stack at the time of forming the sealing body Can suppress the deformation of

  According to the present invention, it is possible to suppress the deformation of the electrode laminate at the time of forming the sealing body.

It is a schematic diagram showing one embodiment of a power storage device. It is a schematic sectional drawing which shows one Embodiment of the electrical storage module which comprises an electrical storage apparatus. It is the principal part expansion schematic which shows an example of a structure of a sealing body. It is a flowchart which shows one Embodiment of the manufacturing method of an electrical storage module. It is the schematic which shows an example of an electrode laminated body formation process. It is the schematic which shows an example of a sealing body formation process. It is the principal part expansion schematic which shows the modification of an electrical storage module. It is the principal part expansion schematic which shows another modification of an electrical storage module.

  Hereinafter, preferred embodiments of a storage module and a method of manufacturing the storage module according to one aspect of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a schematic cross-sectional view showing an embodiment of a power storage device. The storage device 1 shown in the figure is a device used as a battery of various vehicles such as, for example, a forklift, a hybrid car, and an electric car. The storage device 1 is configured to include a storage module stack 2 formed by stacking a plurality of storage modules 4 and a restraint member 3 that applies a restraint load to the storage module stack 2 in the stacking direction.

  The storage module laminate 2 is configured of a plurality (three in the present embodiment) of storage modules 4 and a plurality (four in the present embodiment) of conductive plates 5. The storage module 4 is, for example, a bipolar battery provided with a bipolar electrode 14 described later, 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.

  In the storage module stack 2, the storage modules 4, 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 4 adjacent to each other in the stacking direction and on the outer side of the storage module 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 each conductive plate 5, a plurality of flow paths 5a for circulating a refrigerant such as air are provided. The respective flow paths 5a extend parallel to each other in a direction orthogonal to, for example, the stacking direction and the drawing direction of the positive electrode terminal 6 and the negative electrode terminal 7. In addition to the function as a connecting member for electrically connecting the storage modules 4 and 4 to each other, the conductive plate 5 dissipates heat generated by the storage module 4 by circulating the refrigerant through the flow paths 5a. It also has the function of In the example of FIG. 1, the area of the conductive plate 5 viewed from the stacking direction is smaller than the area of the storage module 4, but from the viewpoint of improvement of heat dissipation, the area of the conductive plate 5 is the storage module The area of 4 may be the same, or the area of the storage module 4 may be larger.

  The restraint member 3 includes a pair of end plates 8 and 8 sandwiching the storage module stack 2 in the stacking direction, and a fastening bolt 9 and a nut 10 for fastening the end plates 8 and 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. The film F which has electrical insulation is provided in the inner surface (surface by the side of the electrical storage module laminated body 2) of the end plate 8. As shown in FIG. The film F electrically 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 power storage module laminate 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 and 8 to be unitized as the storage module stack 2, and a restraint load is applied to the storage module stack 2 in the stacking direction.

  Next, the configuration of the storage module 4 will be described. FIG. 2 is a schematic cross-sectional view showing an embodiment of a storage module. As shown to the same figure, the electrical storage module 4 is equipped with the electrode laminated body 11 and the resin-made sealing body 12 which seals the electrode laminated body 11. As shown in FIG.

  The electrode stack 11 is configured by stacking a plurality of bipolar electrodes 14 via a separator 13. In the present embodiment, the stacking direction of the electrode stack 11 and the stacking direction of the storage module stack 2 coincide with each other. The electrode stack 11 has side surfaces 11 a extending in the stacking direction. The bipolar electrode 14 includes an electrode plate 15, a positive electrode 16 provided on one surface 15 a of the electrode plate 15, and a negative electrode 17 provided on the other surface 15 b of the electrode plate 15.

  The positive electrode 16 is a positive electrode active material layer formed by coating a positive electrode active material. The negative electrode 17 is a negative electrode active material layer formed by coating a negative electrode active material. In the electrode stack 11, the positive electrode 16 of one bipolar electrode 14 faces the negative electrode 17 of one bipolar electrode 14 adjacent in the stacking direction across the separator 13. In the electrode stack 11, the negative electrode 17 of one bipolar electrode 14 faces the positive electrode 16 of the other bipolar electrode 14 adjacent in the stacking direction across the separator 13.

  In the electrode stack 11, the negative electrode termination electrode 18 is disposed at one end in the stacking direction. Moreover, the positive electrode terminal electrode 19 is arrange | positioned at the other end of the lamination direction. The negative electrode terminal electrode 18 includes an electrode plate 15 and a negative electrode 17 provided on the other surface 15 b of the electrode plate 15. The negative electrode 17 of the negative electrode terminal electrode 18 faces the positive electrode 16 of the bipolar electrode 14 at one end in the stacking direction via the separator 13. One conductive plate 5 adjacent to the storage module 4 is in contact with one surface 15 a of the electrode plate 15 of the negative electrode terminal electrode 18. The positive electrode terminal electrode 19 includes an electrode plate 15 and a positive electrode 16 provided on one surface 15 a of the electrode plate 15. The other conductive plate 5 adjacent to the storage module 4 is in contact with the other surface 15 b of the electrode plate 15 of the positive electrode terminal electrode 19. 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 via the separator 13.

  The electrode plate 15 is made of, for example, a metal foil made of nickel or a nickel-plated steel plate, and has a rectangular shape. The edge 15 c of the electrode plate 15 is an uncoated region on which the positive electrode active material and the negative electrode active material are not applied. 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 other surface 15 b of the electrode plate 15 is one size larger than the formation region of the positive electrode 16 on the one surface 15 a of the electrode plate 15.

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

  The sealing body 12 is formed in, for example, a rectangular cylindrical shape by an insulating resin. The sealing body 12 is configured to hold the edge 15 c of the electrode plate 15 at the side surface 11 a of the electrode stack 11 extending in the stacking direction and to surround the side surface 11 a. The sealing body 12 is provided so as to surround the primary sealing body 21 provided along the edge 15 c of the electrode plate 15 of each bipolar electrode 14 and the group H of the primary sealing body 21 from the outside. The secondary sealing body 22 is configured.

  The primary sealing body 21 is formed, for example, by injection molding of a resin, and is continuously provided over all the sides of the electrode plate 15 at an edge portion 15c (uncoated region) on one surface 15a side of the electrode plate 15 There is. The primary sealing body 21 has a function as a spacer between the electrode plates 15 and 15 of the bipolar electrodes 14 and 14 adjacent in the stacking direction. An internal space V defined by the distance between the primary sealing bodies 21 and 21 in the stacking direction is formed between the electrode plates 15 and 15. In the internal space V, an electrolytic solution E made of an alkaline solution such as a potassium hydroxide aqueous solution is accommodated.

  The primary sealing body 21 has an overlapping portion 21 a overlapping the edge 15 c of the electrode plate 15 and an overhanging portion 21 b projecting outward beyond the edge of the electrode plate 15. At least a portion of the overlapping portion 21a is firmly coupled to the edge 15c by welding using, for example, ultrasonic waves or heat. When bonding the primary sealing body 21 and the electrode plate 15, the bonding surface of the electrode plate 15 to the primary sealing body 21 is a roughened plating surface provided with a plurality of fine protrusions.

  In the present embodiment, the entire surface of one surface 15 a of the electrode plate 15 on which the positive electrode 16 is provided is a roughened plating surface. The fine projection is, for example, a projection-like deposited metal (including an applied substance) formed by electrolytic plating on the electrode plate 15. On the roughened plating surface, the resin material constituting the primary sealing body 21 enters into the gaps between the fine projections to produce an anchor effect, and the bonding strength between the electrode plate 15 and the primary sealing body 21 and liquid tightness It is possible to improve the

  FIG. 3: is the principal part enlarged schematic which shows an example of a structure of a sealing body. In the example of the figure, in order to simplify the description, the separator 13 is omitted, and the step portion in which the separators 13 overlap in the primary sealing body 21 is omitted. As shown in FIG. 3, in the electrode stack 11, a group H of primary sealing bodies 21 is formed by stacking the bipolar electrode 14, the negative electrode terminal electrode 18, and the positive electrode terminal electrode 19. The group H of the primary sealing body 21 is made of a plurality of resin materials having different static friction coefficients. Further, in the group H of the primary sealing body 21, the outer surface Ha of the primary sealing body 21 located at the stacking end of the electrode stack 11 in the stacking direction has the most static coefficient of friction among the plurality of resin materials. It is made of high resin material.

  In this embodiment, among the plurality of resin materials, the resin material having the highest coefficient of friction is the first resin material 21A, and the resin material other than the first resin material 21A is the second resin material 21B. In the group H of the sealing body 21, the primary sealing body 21 located at the lamination end of the electrode laminated body 11 in the lamination direction is formed in a single layer by the first resin material 21 </ b> A. In addition, in the group H of the primary sealing body 21, the primary sealing body 21 positioned in the middle of the stacking direction of the electrode stack 11 is formed in a single layer by the second resin material 21B.

  In the example of FIG. 3, the primary sealing body 21 formed on the edge 15 c of the one surface 15 a of the electrode plate 15 of the negative electrode termination electrode 18 and the edge 15 c of the other surface 15 b of the electrode plate 15 of the positive electrode termination electrode 19. The formed primary sealing body 21 is formed of the first resin material 21A. On the other hand, the primary sealing body 21 formed on the edge 15 c of the one surface 15 a of the electrode plate 15 in the bipolar electrode 14 constituting the intermediate layer of the electrode stack 11 and the one surface 15 a of the electrode plate 15 of the positive electrode termination electrode 19 The primary sealing body 21 formed at the edge portion 15c of the first resin material 21A is formed.

  As 1st resin material 21A, the elastomer which mixed the rubber component and the polypropylene, an acid-modified polypropylene etc. are mentioned, for example. Further, as the second resin material 21B, for example, modified polyphenylene ether such as Zylon (registered trademark), polypropylene and the like can be mentioned.

  The secondary sealing body 22 is formed, for example, by injection molding of a resin, and extends over the entire length in the stacking direction of the electrode stack 11. The secondary sealing body 22 is welded to the outer surface of each primary sealing body 21 by, for example, heat at the time of injection molding, and joins the group H of the primary sealing body 21. The secondary sealing body 22 also enters between the primary sealing bodies 21 and 21 adjacent to each other in the stacking direction, and is firmly bonded to the group H of the primary sealing bodies 21. With such a configuration, the electrolytic solution E accommodated in the internal space V can pass between the primary sealing bodies 21 and 21 adjacent to each other in the stacking direction, but between the primary sealing body 21 and the secondary sealing body 22 It is sealed by the welding part.

  Subsequently, a method of manufacturing the storage module 4 will be described. FIG. 4 is a flow chart showing an embodiment of a method of manufacturing the storage module described above. As shown to the same figure, the manufacturing method of this electrical storage module is comprised including an electrode laminated body formation process (step S01) and a sealing body formation process (step S02).

  In the electrode laminate formation step, for example, as shown in FIG. 5, a primary seal-attached bipolar electrode 32 formed by welding the primary seal 21 in advance to the edge 15c of the electrode plate 15 constituting the bipolar electrode 14 is specified. Stack several. Further, a primary sealing body-attached negative electrode termination electrode 33 in which the primary sealing body 21 is disposed in advance at an edge 15 c of the electrode plate 15 constituting the negative electrode termination electrode 18 and an electrode plate 15 constituting the positive electrode termination electrode 19. A positive electrode terminal electrode 34 with a primary seal body, in which the primary seal body 21 is previously disposed at the edge portion 15c, is disposed so as to sandwich the laminate of the bipolar electrode 32 with a primary seal body in the lamination direction. Get the body 11

  In the primary sealed body-attached bipolar electrode 32, the primary sealed body 21 is formed in a single layer by the second resin material 21B, and in the primary sealed body-attached negative electrode termination electrode 33, the primary sealed body 21 is the first. The resin material 21A is formed in a single layer. Moreover, in the primary sealing body-attached positive electrode terminal electrode 34, the primary sealing body 21 on one surface 15a side is formed in a single layer by the second resin material 21B, and the primary sealing body 21 on the other surface 15b side is the first The resin material 21A is formed in a single layer. Therefore, in the group H of the primary sealing body 21, the outer surface Ha of the primary sealing body 21 located at the stacking end of the electrode stack 11 in the stacking direction has the most static coefficient of friction among the plurality of resin materials. It will be constituted by a high resin material.

  At a sealing body formation process, as shown in FIG. 6, the electrode laminated body 11 is arrange | positioned in the metal mold | die K for injection molding. At this time, the outer surface Ha of the primary sealing body 21 located at the stacking end of the electrode stack 11 in the stacking direction is pressed by the mold K, and a compressive force in the stacking direction is applied to the electrode stack 11. Then, a molten resin is injected into the mold K from an injection port (not shown) provided in the mold K, and the secondary seal 22 is formed on the outer surface of the group H of the primary seal 21. Thereby, the group H of the primary sealing body 21 is joined by the secondary sealing body 22, and the sealing body 12 is formed.

  In this sealed body forming step, the pressure resistance of the electrode stack 11 to the injection pressure P of the molten resin injected into the mold K is attributed to the compressive force applied by the mold K in the stacking direction of the electrode stack 11. It is proportional to the product of the compression reaction force F and the static friction coefficient μ of the outer surface Ha in the stacking direction of the primary sealing body 21 in contact with the mold K. Therefore, for the same compression reaction force F, it is possible to increase the withstand voltage of the electrode stack 11 as the static friction coefficient μ of the outer side surface Ha is higher.

The compression reaction force F can be obtained based on the product of the compression surface pressure and the compression width B. The compression surface pressure is the compression ratio of the group H of the primary seal 21 (≒ thickness t _{1 of the} electrode stack 11 after compression / thickness t _{0 of the} electrode stack 11 before compression) and of the primary seal 21. It can be obtained based on the product of the group H and the Young's modulus. The compression width B can be obtained based on the width of the overlapping portion 21 a overlapping the edge 15 c of the electrode plate 15.

  As described above, in the electric storage module 4 and the method of manufacturing the same, the outer surface Ha of the primary sealing body 21 located at the stacking end in the stacking direction forms the group H of the primary sealing body 21. Among resin materials, it is made of a resin material having the highest coefficient of static friction. As described above, when the secondary sealing body 22 is formed by injection molding, the pressure resistance of the electrode stack 11 against the injection pressure of the molten resin is the compressive force applied in the stacking direction of the electrode stack 11 by the mold K. It is determined by the product of the compression reaction force resulting from and the static friction coefficient of the outer surface Ha of the primary sealing body 21 in contact with the mold K in the stacking direction. Therefore, by sufficiently securing the static friction coefficient of the outer side surface Ha of the primary sealing body 21 in the stacking direction, it is possible to increase the withstand voltage of the electrode stack 11 against the injection pressure of the molten resin. The deformation of the electrode stack 11 can be suppressed.

  Further, in the present embodiment, in the group H of the primary sealing body 21, the primary sealing body 21 located at the lamination end in the lamination direction is formed in a single layer by the first resin material 21 A, and The primary sealing body 21 located in the middle is formed in a single layer by the second resin material 21B. With such a configuration, it is possible to avoid the complication of the configuration of the electrode stack 11 while enhancing the withstand voltage of the electrode stack 11.

  The present invention is not limited to the above embodiment. For example, in the group H of the primary sealing body 21, as shown in FIG. 7, for example, the primary sealing body 21 located at the lamination end of the lamination direction of the electrode lamination 11 is formed in a single layer by the first resin material 21A. The primary sealing body 21 positioned in the middle of the stacking direction of the electrode stack 11 may be formed in a plurality of layers by the first resin material 21A and the second resin material 21B. In the example of FIG. 7, the primary sealing body 21 located at the lamination end of the lamination direction of the electrode lamination body 11 is configured in a single layer by the first resin material 21A, as in the case of FIG. Further, the primary sealing body 21 positioned in the middle of the stacking direction of the electrode stack 11 is configured in two layers by the first resin material 21A and the second resin material 21B formed in order from the electrode plate 15 side. ing.

  Also in such a configuration, the static friction coefficient of the outer side surface Ha of the primary sealing body 21 in the stacking direction can be sufficiently secured, and the withstand voltage of the electrode stack 11 can be increased. Moreover, complication of the structure of the electrode laminated body 11 can also be avoided. In addition, in order to simplify the manufacturing process, it is preferable that the thicknesses of the first resin material 21A and the second resin material 21B which constitute the primary sealing body 21 of the intermediate layer be equal.

  Further, in the group H of the primary sealing body 21, as shown in FIG. 8, for example, the primary sealing body 21 located at the lamination end of the lamination direction of the electrode lamination 11 is formed in a plurality of layers by the first resin material 21A. The primary sealing body 21 positioned in the middle of the stacking direction of the electrode stack 11 may be formed in a plurality of layers by the first resin material 21A and the second resin material 21B. In the example of FIG. 8, the primary sealing body 21 located at the lamination end of the electrode laminated body 11 in the lamination direction is formed of two layers of first resin materials 21A and 21A. In addition, the primary sealing body 21 positioned in the middle of the stacking direction of the electrode stack 11 is a first resin material 21A and a second resin material sequentially formed from the electrode plate 15 side as in the case of FIG. It is comprised by two layers by 21B.

  Also in such a configuration, the static friction coefficient of the outer side surface Ha of the primary sealing body 21 in the stacking direction can be sufficiently secured, and the withstand voltage of the electrode stack 11 can be increased. Moreover, complication of the structure of the electrode laminated body 11 can also be avoided. In addition, in order to simplify the manufacturing process, it is preferable that the thickness of the first resin materials 21A and 21A constituting the primary sealing body 21 at the laminated end be equal. Moreover, it is preferable that the thickness of 1st resin material 21A which comprises the primary sealing body 21 of an intermediate | middle layer, and 2nd resin material 21B is equal thickness.

  DESCRIPTION OF SYMBOLS 4 ... Storage module, 11 ... Electrode laminated body, 12 ... Sealed body, 14 ... Bipolar electrode, 15 ... Electrode plate, 15c ... Edge part, 21 ... Primary sealing body, 21A ... 1st resin material, 21B ... 1st 2 resin material, 22 secondary sealing body H primary sealing body group Ha outer side surface K die.

Claims (4)

An electrode stack in which a plurality of bipolar electrodes are stacked;
A sealing body for sealing between the bipolar electrodes adjacent in the stacking direction in the electrode stack;
The sealing body includes a group of primary sealing bodies provided on an edge of an electrode plate constituting the plurality of bipolar electrodes, and a secondary sealing body for coupling the group of primary sealing bodies. Have
The group of primary seals is made of a plurality of resin materials having different coefficients of static friction,
In the group of primary seals, the outer surface in the stacking direction of the primary sealing body located at the stacking end in the stacking direction is made of a resin material having the highest static friction coefficient among the plurality of resin materials. Storage module. In the case where the resin material having the highest coefficient of friction is the first resin material and the resin material other than the first resin material is the second resin material among the plurality of resin materials,
In the group of primary sealing bodies, the primary sealing body located at the lamination end in the lamination direction is formed in a single layer by the first resin material, and the primary one located in the middle of the lamination direction The storage module according to claim 1, wherein a sealing body is formed in a single layer by the second resin material. In the case where the resin material having the highest coefficient of friction is the first resin material and the resin material other than the first resin material is the second resin material among the plurality of resin materials,
In the group of primary sealing bodies, the primary sealing body located at the lamination end in the lamination direction is formed in a single layer by the first resin material, and the primary one located in the middle of the lamination direction The power storage module according to claim 1, wherein a plurality of sealing bodies are formed of the first resin material and the second resin material in order from the electrode plate side. An electrode laminated body forming step of laminating an electrode including a primary sealed body-attached bipolar electrode formed by arranging a primary sealed body at an edge portion of an electrode plate constituting the bipolar electrode to form an electrode laminated body;
The electrode laminate is disposed in a mold for injection molding so that a compressive force in the lamination direction is applied to the electrode laminate, and a molten resin is injected into the mold to group the primary sealing body. Forming a secondary sealing body for bonding
In the electrode laminated body forming step, the lamination of the primary sealed body positioned at the lamination end in the laminating direction by a resin material having the highest static friction coefficient among the plurality of resin materials constituting the group of the primary sealed bodies. Constitute the outer side of the direction,
The manufacturing method of the electrical storage module which applies the said compressive force to the said electrode laminated body by pressing the said outer surface with the said metal mold in the said sealing body formation process.

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