JP2019200954A - Manufacturing method of power storage module and jig for manufacturing power storage module - Google Patents

Abstract

To prevent occurrence of a non-impregnated part, in manufacture of a power storage module having an internal space by an uncoated part.SOLUTION: In a manufacturing method of a power storage module 4A where multiple bipolar electrodes 14A, having a positive electrode 16 and a negative electrode 17 coated with an active material, respectively, on one face 15a and the other face 15b of an electrode plate 15 and an uncoated part 15u, not coated with the active material, are laminated via a separator 13 so that the uncoated parts 15u are superposed, and electrolyte is injected between the bipolar electrodes 14A, the size of the internal space V between the bipolar electrodes 14A is reduced, by applying pressure to the uncoated parts 15u, respectively, in the compression step. In a state where the size of the internal space V is reduced by the compression step, electrolyte is injected between the bipolar electrodes 14A by the injection step. With such an arrangement, occurrence of a non-impregnated part can be prevented in manufacture of a power storage module 4A having the internal space V by the uncoated part 15u.SELECTED DRAWING: Figure 6

Description

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

  A power storage module has been proposed in which a plurality of electrodes are stacked via a separator and an electrolyte is impregnated between the electrodes. In order to cope with the gas generated during charging / discharging in the power storage module, for example, in Patent Document 1, a plurality of grooves reaching the end of the electrode are provided in the active material layer of the electrode, and an internal space is formed by the groove. A battery is disclosed. Further, in Patent Document 2, a surface of the electrode such as a bipolar electrode that is in contact with a separator is provided with a groove that is an uncoated portion that is opened at an outer peripheral edge of the electrode, and an internal space is formed by the groove. A hydrogen storage battery is disclosed.

JP 2002-15764 A Japanese Patent Application No. 2017-136271

  By the way, in the technology as described above, when an electrolyte solution is injected between the electrodes at the time of manufacturing the power storage module, the electrolyte solution is impregnated in preference to the internal space by the uncoated part, and a prescribed amount of the electrolyte solution is injected. There is a possibility that an unimpregnated part may occur even if the liquid is used.

  Accordingly, an object of the present invention is to provide a method for manufacturing a power storage module and a jig for manufacturing a power storage module that can prevent an unimpregnated portion from occurring in the manufacture of a power storage module having an internal space by an uncoated portion. To do.

  According to the present invention, a plurality of bipolar electrodes each having an electrode part coated with an active material on each of both surfaces of an electrode plate and an uncoated part not coated with an active material are uncoated via a separator. A method of manufacturing a power storage module in which each of the working parts is laminated so that they overlap each other, and an electrolyte is injected between the bipolar electrodes, and by applying pressure to each of the uncoated parts, the internal space between the bipolar electrodes A method of manufacturing a power storage module comprising a pressurizing step for reducing the size of the battery and a pouring step for injecting an electrolyte between the bipolar electrodes in a state where the size of the internal space is reduced by the pressurizing step is there.

  According to this configuration, a plurality of bipolar electrodes each having an electrode part coated with an active material on each of both surfaces of the electrode plate and an uncoated part not coated with an active material are interposed via a separator. In a method of manufacturing a power storage module in which each uncoated part is stacked so that the electrolyte solution is injected between bipolar electrodes, by applying pressure to each uncoated part in a pressurizing step, The size of the internal space between the electrodes is reduced. By the liquid injection process, the electrolytic solution is injected between the bipolar electrodes in a state where the size of the internal space is reduced by the pressurization process. Thereby, it can prevent that an unimpregnated part arises in manufacture of the electrical storage module which has the interior space by an uncoated part.

  In this case, the power storage module includes a plurality of bipolar electrodes through a separator between a pair of terminal electrodes each having an electrode part to which the active material is applied and an uncoated part to which the active material is not applied. The uncoated parts of the terminal electrode and the bipolar electrode are stacked so as to overlap each other, and in the pressurizing process, pressure is applied to the uncoated part of the terminal electrode, so that between the bipolar electrodes and between the terminal electrode and the bipolar electrode In the liquid injection process, it is preferable to inject an electrolyte between the bipolar electrodes and between the termination electrode and the bipolar electrode.

  According to this configuration, a plurality of bipolar electrodes are sandwiched between a pair of terminal electrodes having an electrode part to which an active material is applied and an uncoated part to which no active material is applied via a separator. In the power storage module in which the uncoated portions of the terminal electrode and the bipolar electrode are stacked so that they overlap each other, in the pressurizing step, pressure is applied to the uncoated portion of the terminal electrode so The size of the internal space between the electrode and the bipolar electrode can be reduced. In the liquid injection process, the electrolyte is injected between the bipolar electrodes and between the terminal electrode and the bipolar electrode. It is possible to prevent the unimpregnated portion from being easily generated by the pressurization.

  In addition, it is preferable to further include a restoration step for reducing the pressure applied in the pressurization step after the liquid injection step.

  According to this configuration, since the pressure applied in the pressurization step is reduced after the liquid injection step by the restoration step, the size of the internal space can be restored.

  Further, the present invention provides an electrode plate that is sandwiched between a pair of terminal electrodes having an electrode part to which an active material is applied and an uncoated part to which an active material is not applied via a separator. Each of a plurality of bipolar electrodes each having an electrode part coated with an active material on each of both surfaces and an uncoated part not coated with an active material is terminated by a separator between them. And a non-coated portion of the bipolar electrode are laminated so as to overlap each other, and a jig for manufacturing an electricity storage module in which an electrolytic solution is injected between the bipolar electrodes and between the termination electrode and the bipolar electrode. It is a jig for manufacture of an electrical storage module provided with the projection part pushed in toward the uncoated part.

  According to this configuration, the electrode plate is sandwiched between the pair of terminal electrodes having the electrode part to which the active material is applied and the uncoated part to which the active material is not applied via the separator. Each of a plurality of bipolar electrodes each having an electrode part coated with an active material on each of both surfaces and an uncoated part not coated with an active material is terminated by a separator between them. In an electrical storage module manufacturing jig in which the uncoated portions of the electrode and the bipolar electrode are laminated so that they overlap each other, and the electrolytic solution is injected between the bipolar electrodes and between the termination electrode and the bipolar electrode, the protruding portion terminates. Injecting the electrolyte between the bipolar electrodes and between the termination electrode and the bipolar electrode in a state in which the size of the internal space is reduced by a jig with a simple structure to push toward the uncoated part of the electrode In I, it is possible to prevent the non-impregnated portion is generated.

  According to the method for manufacturing a power storage module and the jig for manufacturing a power storage module of the present invention, it is possible to prevent the occurrence of an unimpregnated portion in the manufacture of a power storage module having an internal space by an uncoated portion.

It is a schematic sectional drawing which shows one Embodiment of an electrical storage apparatus. It is a schematic sectional drawing by the XZ plane which shows the internal structure of the electrical storage module of FIG. It is a schematic sectional drawing by the YZ plane which shows the internal structure of the electrical storage module of FIG. It is a longitudinal cross-sectional view by the alpha line of the bipolar electrode of FIG. (A) is a schematic sectional drawing by the XZ plane which shows the outline of the jig for manufacture of the electrical storage module which concerns on embodiment, (B) is the schematic cross section by the YZ plane which shows the outline of the jig for manufacture of the electrical storage module which concerns on embodiment. FIG. It is a schematic sectional drawing by the XZ plane which shows the outline of the pressurization process and liquid injection process of the manufacturing method of the electrical storage module which concerns on embodiment. It is a schematic sectional drawing by the YZ plane which shows the outline of the pressurization process of the manufacturing method of the electrical storage module which concerns on embodiment. (A), (B) and (C) are schematic sectional views corresponding to FIG. 4 of a bipolar electrode according to another embodiment. It is a longitudinal cross-sectional view which shows the outline of the jig for manufacture of an electrical storage module provided with the bipolar electrode of FIG. 8 (A).

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a schematic cross-sectional view showing an embodiment of a power storage device. The power storage device 1 shown in FIG. 1 is used as a battery for various vehicles such as forklifts, hybrid vehicles, and electric vehicles. The power storage device 1 includes a power storage module stack 2 formed by stacking a plurality of power storage modules 4A, and a restraining member 3 that applies a restraining load to the power storage module stack 2 in the stacking direction along the Z axis. It is configured.

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

  The power storage modules 4 </ b> A and 4 </ b> A adjacent in the stacking direction are electrically connected via the conductive plate 5. The conductive plates 5 are respectively disposed between the power storage modules 4A and 4A adjacent in the stacking direction and the outside of the power storage module 4A located at the stacking end. A positive electrode terminal 6 is connected to one of the conductive plates 5 arranged outside the power storage module 4A located at the end of the stack. A negative electrode terminal 7 is connected to the other conductive plate 5 disposed outside the power storage module 4A located at the stacking end. For example, the positive electrode terminal 6 and the negative electrode terminal 7 are drawn from the edge of the conductive plate 5 in a direction along the X axis that intersects the stacking direction. The power storage device 1 is charged and discharged by the positive electrode terminal 6 and the negative electrode terminal 7.

  Inside each conductive plate 5, a plurality of flow paths 5a for circulating a refrigerant such as air are provided. Each flow path 5a extends in parallel to each other in a direction along the Y axis that is orthogonal to the stacking direction and the drawing direction of the positive electrode terminal 6 and the negative electrode terminal 7, for example. By causing the refrigerant to flow through these flow paths 5a, the conductive plate 5 functions as a connecting member that electrically connects the power storage modules 4A and 4A, and also dissipates heat generated in the power storage module 4. It also has the function as 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 power storage module 4, but from the viewpoint of improving heat dissipation, the area of the conductive plate 5 is the area of the power storage module 4. It may be the same as or larger than the area of the power storage module 4.

  The restraining member 3 includes a pair of end plates 8 and 8 that sandwich the power storage module stack 2 in the stacking direction, and a fastening bolt 9 and a nut 10 that fasten the end plates 8 and 8 together. The end plate 8 is a rectangular metal plate having an area that is slightly larger than the areas of the power storage module 4 and the conductive plate 5 as viewed from the stacking direction. On the inner side surface of the end plate 8 (the surface on the power storage module laminate 2 side), an electrically insulating film F is provided. The film F insulates the end plate 8 from the conductive plate 5.

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

  Next, the configuration of the power storage module 4A will be described in more detail. As illustrated in FIGS. 2 and 3, the power storage module 4 </ b> A includes an electrode stack 11 and a seal member 12 that seals (seals) the electrode stack 11.

  The electrode laminate 11 is formed by laminating a plurality of bipolar electrodes 14 </ b> A via separators 13. In this example, the stacking direction D1 of the electrode stack 11 coincides with the Z-axis direction that is the stacking direction of the power storage module stack 2. The bipolar electrode 14 </ b> A includes an electrode plate 15, a positive electrode 16 that is an electrode portion provided on one surface 15 a of the electrode plate 15, and a negative electrode 17 that is an electrode portion 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 </ b> A faces the negative electrode 17 of one bipolar electrode 14 </ b> A adjacent in the stacking direction D <b> 1 across the separator 13. In the electrode laminate 11, the negative electrode 17 of one bipolar electrode 14 </ b> A faces the positive electrode 16 of the other bipolar electrode 14 </ b> A adjacent in the stacking direction D <b> 1 with the separator 13 interposed therebetween.

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

  The electrode plate 15 is made of metal, and is made of, for example, nickel or a nickel-plated steel plate. The electrode plate 15 is a rectangular metal foil made of nickel, for example. As shown in FIGS. 2, 3 and 4, on one surface 15a of the electrode plate 15 of the bipolar electrode 14A, six rectangular positive electrodes 16 whose longitudinal direction is the X-axis direction are arranged in the Y-axis direction. . Similarly, on the other surface 15b of the electrode plate 15 of the bipolar electrode 14A, six rectangular negative electrodes 17 whose longitudinal direction is the X-axis direction are arranged in the Y-axis direction. In the one surface 15a and the other surface 15b of the electrode plate 15 of the bipolar electrode 14A, a portion where the positive electrode 16 and the negative electrode 17 are not formed is an uncoated portion 15u. The outer edge portion 15c of the electrode plate 15 (the outer edge portion of the bipolar electrode 14A) has a rectangular frame shape, and is an uncoated portion 15u to which the positive electrode active material and the negative electrode active material are not applied.

  An example of the positive electrode active material constituting the positive electrode 16 is nickel hydroxide. 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 slightly larger than the formation region of the positive electrode 16 on the one surface 15 a of the electrode plate 15. The arrangement of the negative electrode 17 and the uncoated portion 15u of the negative electrode termination electrode 18 and the arrangement of the positive electrode 16 and the uncoated portion 15u of the positive electrode termination electrode 19 are also the same as the negative electrode 17, the positive electrode 16 and the uncoated portion 15u of the bipolar electrode 14A. It is the same as the arrangement.

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

  The seal member 12 is made of, for example, an insulating resin. Examples of the resin material constituting the seal member 12 include polypropylene (PP), polyphenylene sulfide (PPS), and modified polyphenylene ether (modified PPE). The sealing member 12 surrounds the electrode laminate 11 and is configured to hold the outer edge portions 15 c of the plurality of electrode plates 15.

  The seal member 12 includes a frame-shaped primary seal 21 (resin frame) provided at the outer edge portion 15 c and a cylindrical secondary seal 22 (provided around the primary seal 21) that accommodates the electrode stack 11. Resin tube). The primary seal 21 is a film having a predetermined thickness (length in the stacking direction D1). The primary seal 21 has a rectangular frame shape when viewed from the stacking direction D1, and is continuously welded over the entire circumference of the outer edge portion 15c by, for example, ultrasonic waves or heat. The primary seal 21 is provided on the outer edge portion 15 c on the one surface 15 a side of the electrode plate 15. The primary seal 21 is provided on the outer edge portion 15 c with the outer edge portion 15 c embedded therein, and covers the end surface of the electrode plate 15. The primary seal 21 is provided apart from the positive electrode 16 and the negative electrode 17 when viewed from the stacking direction D1. The primary seals 21 and 21 adjacent in the stacking direction D1 are in contact with each other.

  The primary seal 21 has a first portion 21a and a second portion 21b. The first portion 21a is provided on the one surface 15a and overlaps the electrode plate 15 when viewed from the stacking direction D1. The second portion 21b is formed integrally with the first portion 21a and is provided outside the electrode plate 15 when viewed from the stacking direction D1. The thickness of the first portion 21a is smaller than the thickness of the second portion 21b and is equal to the thickness of the positive electrode 16, but may be equal to or greater. A step surface 21c extending in the stacking direction D1 is formed between the first portion 21a and the second portion 21b.

  The outer edge portion of the separator 13 is disposed on the upper surface of the first portion 21a. When viewed from the stacking direction D1, the first portion 21a and the outer edge portion of the separator 13 overlap each other. The outer edge portion of the separator 13 is fixed to the upper surface of the first portion 21a, for example, by welding at a plurality of locations aligned along the outer edge of the separator 13. The outer edge of the separator 13 may be in contact with the step surface 21c or may be separated from the step surface 21c. In the present embodiment, the height of the step surface 21c (the length in the stacking direction D1) is equal to the sum of the thickness of the separator 13 and the thickness of the negative electrode 17, but may be equal to or greater.

  The secondary seal 22 surrounds the electrode stack 11 and the primary seal 21 and constitutes the outer wall (housing) of the power storage module 4. The secondary seal 22 is formed by, for example, resin injection molding, and extends over the entire length of the electrode stack 11 in the stacking direction D1. The secondary seal 22 has a rectangular cylindrical shape extending with the stacking direction D1 as the axial direction. The secondary seal 22 covers the outer surface of the primary seal 21 extending in the stacking direction D1. The secondary seal 22 is joined to the outer surface of the primary seal 21 and seals the outer surface of the primary seal 21. The secondary seal 22 is welded to the outer surface of the primary seal 21 by heat during injection molding, for example. The secondary seal 22 may be welded to the outer surface of the primary seal 21 by hot plate welding.

  Between the uncoated portions 15u and 15u of the electrode plates 15 and 15 of the bipolar electrode 14A, the negative electrode termination electrode 18 and the positive electrode termination electrode 19 which are adjacent to each other in the stacking direction D1, the electrode plate 15 and the seal member 12 provide airtightness. An internal space V partitioned in a watertight manner is formed. The internal space V is formed in order to cope with the gas generated during charging / discharging in the power storage module 4A. In the internal space V, an electrolytic solution (not shown) made of an alkaline aqueous solution such as an aqueous potassium hydroxide solution is accommodated. The electrolytic solution is impregnated in the separator 13, the positive electrode 16, and the negative electrode 17. Since the electrolytic solution is strongly alkaline, the seal member 12 is made of a resin material having strong alkali resistance.

  The primary seal 21 is provided with a liquid injection port 21p that extends in the X-axis direction intersecting (here, orthogonal) to the stacking direction D1 and communicates from each internal space V to the secondary seal 22. The secondary seal 22 has a liquid injection port 22p that extends in the X-axis direction intersecting (here, orthogonal) to the stacking direction D1 and communicates from the liquid injection port 21p of the primary seal 21 to the outside of the power storage module 4A. Is provided. The liquid injection port portions 21p and 22p function as a liquid injection port for injecting an electrolytic solution into each internal space V, and also function as a connection port for a pressure regulating valve (not shown) after the electrolytic solution is injected. To do.

  As described above, in the power storage module 4A, the pair of the negative electrode termination electrode 18 and the positive electrode termination electrode 19 each including the positive electrode 16 and the negative electrode 17 coated with the active material and the uncoated portion 15u not coated with the active material. The active material is not applied to the positive electrode 16 and the negative electrode 17 on which the active material is applied to each of the one surface 15a and the other surface 15b of the electrode plate 15 so as to be sandwiched between the electrodes 13 Each of the plurality of bipolar electrodes 14A having the coating part 15u overlaps the uncoated part 15u of the negative electrode termination electrode 18, the positive electrode termination electrode 19 and the bipolar electrode 14A via the separator 13 therebetween. Are stacked. An electrolyte is injected between the bipolar electrodes 14A, between the negative electrode termination electrode 18 and the bipolar electrode 14A, and between the positive electrode termination electrode 19 and the bipolar electrode 14A. Note that all the uncoated portions 15u of the bipolar electrode 14A, the negative electrode termination electrode 18 and the positive electrode termination electrode 19 do not have to overlap. Moreover, all the internal spaces V do not need to overlap.

  Hereinafter, the jig for manufacturing the power storage module of this embodiment will be described. A jig 40A for manufacturing the power storage module 4A as shown in FIGS. 5A and 5B has a configuration substantially similar to that of the restraining member 3. The manufacturing jig 40A includes a pressure plate 41 that applies pressure from the pressure surface 41p to the other surface 15b of the positive electrode termination electrode 19 on the opposite side of the positive electrode 16 and the uncoated portion 15u of the electrode plate 15. Further, the manufacturing jig 40A includes a pressure plate 42 that applies pressure from the pressure surface 42p to the one surface 15a opposite to the negative electrode 17 and the uncoated portion 15u of the electrode plate 15 of the negative electrode termination electrode 18. The manufacturing jig 40 </ b> A includes a bolt 43 that connects the pressure plate 41 and the pressure plate 42 while changing the interval between the pressure plate 41 and the pressure plate 42.

  The manufacturing jig 40A has an uncoated positive electrode termination electrode 19 on the pressure surface 41p of the pressure plate 41 and the other surface 15b of the positive electrode termination electrode 19 opposite to the positive electrode 16 and the uncoated portion 15u. The protrusion part 44 pushed toward the part 15u is provided. In addition, the manufacturing jig 40A is configured so that the negative electrode termination electrode 18 is not applied to the pressure surface 42p of the pressure plate 42 on the one surface 15a of the negative electrode termination electrode 18 opposite to the negative electrode 17 and the uncoated portion 15u. A projecting portion 44 that is pushed toward the coating portion 15u is provided. In other words, the manufacturing jig 40A includes a protruding portion 44 that protrudes from a portion of the pressing surfaces 41p and 42p that faces the uncoated portion 15u. For example, the length of the protrusion 44 protruding from the pressure surfaces 41p and 42p can be set to a length equal to or less than half of the total thickness of the internal space V along the stacking direction D1 of the electrode stack 11. . In addition, the protrusion part 44 does not need to protrude from the site | part which opposes all the uncoated parts 15u.

  Hereinafter, the manufacturing method of the electrical storage module of this embodiment is demonstrated. As shown in FIGS. 6 and 7, a pressure process is performed to reduce the size of the internal space V between the bipolar electrodes 14 </ b> A by applying pressure to each of the uncoated portions 15 u of the power storage module 4 </ b> A. In the pressurizing step, the manufacturing jig 40A is attached to the power storage module 4A, and a pressure is applied to the uncoated portion 15u of the negative electrode termination electrode 18 by the protruding portion 44 of the pressurizing surface 42p of the manufacturing jig 40A. The size of the internal space V between the electrodes 14A and between the negative electrode termination electrode 18 and the bipolar electrode 14A is reduced. Further, in the pressurizing step, pressure is applied to the uncoated portion 15u of the positive electrode termination electrode 19 by the protruding portion 44 of the pressurization surface 41p of the manufacturing jig 40A, so that the gap between the bipolar electrodes 14A and between the positive electrode termination electrode 19 and the bipolar electrode 14A is increased. The size of the internal space V between the two is reduced.

  In the present embodiment, the size of the internal space V is reduced in the pressurizing step, and the internal space V substantially disappears. However, the internal space V does not necessarily need to be extinguished, and a part of the internal space V may remain. Further, the size of all the internal spaces V may not be reduced. 6 and 7 are schematic diagrams schematically showing dimensions of the electrode stack 11 in the stacking direction D1, such as the thickness of the internal space V along the stack direction D1 (Z-axis direction) of the electrode stack 11. Is highlighted. However, in actuality, the inside of the bipolar electrode 14A, the negative electrode termination electrode 18 and the positive electrode termination electrode 19 of the electrode laminate 11 is larger than the size of the one surface 15a and the other surface 15b of the electrode plate 15 in the X-axis direction and the Y-axis direction. The dimension in the stacking direction D1 of the electrode stack 11 such as the thickness of the space V is extremely small. Therefore, the projection 44 of the manufacturing jig 40A can easily reduce the size of the internal space V until it almost disappears.

  As shown in FIG. 6, in the state where the size of the internal space V is reduced by the pressurization process, the liquid injection port 50 pours the liquid injection port 22 p of the secondary seal 22 and the primary seal 21 of the seal member 12. A liquid injection step of injecting an electrolytic solution from the liquid inlet 21p to the bipolar electrode 14A, between the negative electrode termination electrode 18 and the bipolar electrode 14A, and between the positive electrode termination electrode 19 and the bipolar electrode 14A is performed. Thereby, the electrolytic solution is impregnated in the separator 13, the positive electrode 16, and the negative electrode 17.

  As shown in FIG.2 and FIG.3, the restoration process which reduces the pressure added by the pressurization process is performed after an injection process. In the restoration process, for example, the size of the internal space V is restored by removing the manufacturing jig 40A from the power storage module 4A. Thereafter, as illustrated in FIG. 1, the power storage module stack 2 is formed by stacking the power storage module 4 </ b> A and the conductive plate 5, and the stacking direction along the Z axis with respect to the power storage module stack 2 by the restraining member 3. The power storage device 1 is manufactured by applying a restraining load to D1.

  In the present embodiment, a plurality of positive electrodes 16 and negative electrodes 17 each coated with an active material on each of the one surface 15a and the other surface 15b of the electrode plate 15 and an uncoated portion 15u that is not coated with an active material. In the manufacturing method of the power storage module 4A in which the bipolar electrodes 14A are stacked so that the uncoated portions 15u overlap each other via the separator 13, and the electrolyte solution is injected between the bipolar electrodes 14A, By applying pressure to each of the coating portions 15u, the size of the internal space V between the bipolar electrodes 14A can be reduced. By the liquid injection process, the electrolytic solution is injected between the bipolar electrodes 14A in a state where the size of the internal space V is reduced by the pressurization process. Thereby, it can prevent that an unimpregnated part arises in manufacture of electrical storage module 4A which has internal space V by uncoated part 15u.

  Moreover, according to this embodiment, the negative electrode termination electrode 18 which has the negative electrode 17 to which the active material is applied, and the uncoated part 15u to which the active material is not applied, and the positive electrode to which the active material is applied A plurality of bipolar electrodes 14A are sandwiched between a positive electrode termination electrode 19 having an uncoated portion 15u not coated with an active material 16 via a separator 13, and a negative electrode termination electrode 18 and a positive electrode termination electrode 19 In the power storage module 4A stacked so that the uncoated portions 15u and the bipolar electrode 14A overlap each other, in the pressurizing step, pressure is applied to the uncoated portions 15u of the negative electrode termination electrode 18 and the positive electrode termination electrode 19. This reduces the size of the internal space V between the bipolar electrodes 14A, between the negative electrode termination electrode 18 and the bipolar electrode 14A, and between the positive electrode termination electrode 19 and the bipolar electrode 14A. It is. Further, in the liquid injection process, an electrolytic solution is injected between the bipolar electrodes 14A, between the negative electrode termination electrode 18 and the bipolar electrode 14A, and between the positive electrode termination electrode 19 and the bipolar electrode 14A. For this reason, it can prevent that an unimpregnated part arises easily by the pressurization from the outer side of the electrical storage module 4A.

  Moreover, according to this embodiment, since the pressure applied in the pressurization process is reduced after the liquid injection process by the restoration process, the size of the internal space V can be restored.

  Further, according to the present embodiment, in the jig 40A for manufacturing the electricity storage module 4A as described above, the protruding portion 44 is pushed toward the uncoated portion 15u of the negative electrode termination electrode 18 and the positive electrode termination electrode 19, so that the simple In a state where the size of the internal space V is reduced by the jig having the configuration, an electrolytic solution is injected between the bipolar electrodes 14A, between the negative terminal electrode 18 and the bipolar electrode 14A, and between the positive terminal electrode 19 and the bipolar electrode 14A. The liquid can prevent an unimpregnated part from occurring.

  As mentioned above, although embodiment of this invention was described, this invention is implemented in various forms, without being limited to the said embodiment. For example, the arrangement of the positive electrode 16, the negative electrode 17 and the uncoated portion 15u on the one surface 15a and the other surface 15b of the electrode plate 15 of the bipolar electrode 14A, the negative electrode termination electrode 18 and the positive electrode termination electrode 19 can be changed as appropriate. For example, as shown in FIG. 8A, on the one surface 15a of the electrode plate 15 of the bipolar electrode 14B, a plurality of rectangular positive electrodes 16 whose longitudinal direction is the Y-axis direction may be arranged in the vertical direction. .

  Further, as shown in FIG. 8B, on one surface 15a of the electrode plate 15 of the bipolar electrode 14C, one rectangular positive electrode 16 is disposed in the center of the one surface 15a, and the periphery of the positive electrode 16 is not coated. The part 15u may be arranged. Further, as shown in FIG. 8C, a plurality of rectangular positive electrodes 16 are arranged on the one surface 15a of the electrode plate 15 of the bipolar electrode 14D while being dispersed at various locations on the one surface 15a. An uncoated portion 15u may be disposed between each of the above and around each of the positive electrodes 16.

  In the bipolar electrodes 14B, 14C, and 14D, the arrangement of the negative electrode 17 and the uncoated portion 15u on the other surface 15b of each of the bipolar electrodes 14B, 14C, and 14D is also the same as the one surface 15a of each of the bipolar electrodes 14B, 14C, and 14D. The arrangement of the positive electrode 16 and the uncoated portion 15u in FIG. Further, when the bipolar electrodes 14B, 14C, and 14D are applied, the arrangement of the negative electrode 17 of the negative electrode termination electrode 18 and the uncoated portion 15u and the positive electrode 16 of the positive electrode termination electrode 19 and the uncoated portion 15u are arranged. The arrangement is changed in accordance with the arrangement of the positive electrode 16, the negative electrode 17, and the uncoated portion 15u of each of the bipolar electrodes 14B, 14C, and 14D.

  Further, in any of the bipolar electrodes 14B, 14C, and 14D, on the pressure surface 41p of the pressure plate 41, on the other surface 15b on the opposite side of the positive electrode 16 of the electrode plate 15 of the positive electrode termination electrode 19 and the uncoated portion 15u. A protrusion 44 that pushes toward the uncoated portion 15 u of the positive electrode termination electrode 19, and is opposite to the negative electrode 17 and the uncoated portion 15 u of the electrode plate 15 of the negative electrode termination electrode 18 on the pressure surface 42 p of the pressure plate 42. By using a manufacturing jig provided with a protruding portion 44 that is pushed toward the uncoated portion 15u of the negative electrode termination electrode 18 on the one side surface 15a, the pressurization step and the liquid injection step can be performed. For example, when manufacturing a power storage module including the bipolar electrode 14B as shown in FIG. 8A, a manufacturing jig 40B as shown in FIG. 9 can be applied.

  Further, in the pressurizing step, the internal space V between the bipolar electrodes 14 is increased by applying pressure to each of the uncoated portions 15u by a method using a press machine or the like other than the method using the manufacturing jigs 40A and 40B. The thickness may be reduced.

  DESCRIPTION OF SYMBOLS 1 ... Power storage device, 2 ... Power storage module laminated body, 3 ... Restraint member, 4A ... Power storage module, 5 ... Conductive plate, 5a ... Flow path, 6 ... Positive electrode terminal, 7 ... Negative electrode terminal, 8 ... End plate, 8a ... Insertion Holes, 9 ... fastening bolts, 10 ... nuts, 11 ... electrode laminates, 12 ... seal members, 13 ... separators, 14A, 14B, 14C, 14D ... bipolar electrodes, 15 ... electrode plates, 15a ... one side, 15b ... other Direction, 15c ... outer edge portion, 15u ... uncoated portion, 16 ... positive electrode, 17 ... negative electrode, 18 ... negative electrode termination electrode, 19 ... positive electrode termination electrode, 21 ... primary seal, 21a ... first part, 21b ... second Part, 21c ... step surface, 21p ... injection port, 22 ... secondary seal, 22p ... injection port, 40A, 40B ... manufacturing jig, 41, 42 ... pressure plate, 41p, 42p ... pressure surface, 43 ... Bolt, 50 ... Injector, F ... Irumu, V ... internal space.

Claims (4)

A plurality of bipolar electrodes each having an electrode part coated with an active material on each of both surfaces of the electrode plate and an uncoated part not coated with the active material are separated from each other by a separator. Is a method of manufacturing a power storage module in which each of the layers is stacked so that an electrolyte is injected between the bipolar electrodes,
A pressure process for reducing the size of the internal space between the bipolar electrodes by applying pressure to each of the uncoated portions;
A liquid injection step of injecting the electrolytic solution between the bipolar electrodes in a state where the size of the internal space is reduced by the pressurization step. The power storage module includes a plurality of the bipolar via a separator between a pair of terminal electrodes having an electrode part to which the active material is applied and an uncoated part to which the active material is not applied. The electrode is sandwiched, and the terminal electrode and the bipolar electrode are stacked so that each of the uncoated portions overlaps,
In the pressurizing step, by applying pressure to the uncoated portion of the termination electrode, the size of the internal space between the bipolar electrodes and between the termination electrode and the bipolar electrode is reduced,
The method for manufacturing an energy storage module according to claim 1, wherein in the liquid injection step, the electrolytic solution is injected between the bipolar electrodes and between the terminal electrode and the bipolar electrode.   The manufacturing method of the electrical storage module of Claim 1 or Claim 2 further equipped with the decompression | restoration process which reduces the pressure added by the said pressurization process after the said liquid injection process. Both surfaces of the electrode plate are sandwiched between a pair of terminal electrodes having an electrode part to which an active material is applied and an uncoated part to which the active material is not applied via a separator. Each of a plurality of bipolar electrodes each having an electrode part to which an active material is applied and an uncoated part to which the active material is not applied is interposed between the terminal electrode and the terminal electrode via the separator. A jig for manufacturing an electricity storage module in which each of the uncoated portions with a bipolar electrode is laminated so as to overlap, and an electrolytic solution is injected between the bipolar electrodes and between the termination electrode and the bipolar electrode. ,
A jig for manufacturing a power storage module, comprising a protruding portion pushed into the uncoated portion of the terminal electrode.

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