JP2018088312A - Manufacturing method of power storage device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of a power storage device, capable of controlling a filling quantity of an electrolyte, while reducing a manufacturing time.SOLUTION: A manufacturing method of a power storage device 1, comprises: a first step S1 of housing a laminate body 2 at least having a positive electrode 12 and a negative electrode 13, and housing, in a chamber 31, a case C to which a liquid injection port 1a of an electrolyte E is provided; a second step S2 of reducing a pressure in the chamber 31 down to a pressure P2 that is lower than an ambient pressure P1; a third step S3 of doping the liquid injection port 1a of the case C into the electrolyte E in a state of maintaining an inner side of the chamber 31 to the pressure P2; and a fourth step S4 of injecting the electrolyte E into the case C from the liquid injection port 1a by increasing the pressure in the chamber 31 from the pressure P2 up to the ambient pressure P1 in a state of doping the liquid injection port 1a in the electrolyte E. The pressure P2 is set to a value larger than a pressure allowing an inner space of the case C to be filled with the electrolyte E.SELECTED DRAWING: Figure 2

Description

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

  As a conventional power storage device, 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 includes a stacked body in which a plurality of bipolar electrodes are stacked via a separator, and a frame body in which the stacked body is accommodated.

  In the frame of the bipolar battery as described above, an electrolytic solution is accommodated in addition to the laminate. For example, Patent Document 2 described below describes a method in which an electrolytic solution is injected into the battery can by applying pressure after immersing the open end of the battery can (case) in the electrolytic solution under vacuum.

JP 2011-151016 A Japanese Patent Laid-Open No. 5-94816

  By the way, in a power storage device such as the above-described bipolar battery, in order to suppress a reduction in life due to expansion of the case, a space for accommodating a gas generated according to use or the like is provided in the case. However, when the method of injecting the electrolytic solution as described above is simply adopted, the electrolytic solution is accommodated in the case without any gap, and the space is not provided in the case. For this reason, if the process of discharging a part of the injected electrolyte from the case in order to secure the space, man-hours increase.

  An object of the present invention is to provide a method of manufacturing a power storage device that can easily control the amount of electrolyte injected while realizing a reduction in manufacturing time.

  A method for manufacturing a power storage device according to one aspect of the present invention includes a first step of accommodating a laminate having at least a positive electrode and a negative electrode, and accommodating a case provided with an electrolyte injection port in the chamber; A second step of lowering the internal pressure to a pressure P2 lower than the atmospheric pressure P1, a third step of immersing the liquid injection port of the case in the electrolyte while maintaining the inside of the chamber at the pressure P2, and a liquid injection And a fourth step of injecting the electrolyte from the injection port into the case by increasing the pressure in the chamber from the pressure P2 to the atmospheric pressure P1 with the mouth immersed in the electrolyte. Is set larger than the pressure that can fill the internal space of the case with the electrolyte.

  In this power storage device manufacturing method, in the second step, the pressure P2 is set to be larger than the pressure at which the internal space of the case can be filled with the electrolytic solution. For this reason, gas remains in the internal space of the case after the second step. Then, by performing the third step and the fourth step in order, the electrolytic solution can be injected into the internal space while the gas remains in the internal space of the case. Thereby, both gas and electrolyte can be made to exist in the internal space of a case, without performing the process etc. which discharge | emit the electrolyte solution accommodated in the case. Therefore, the manufacturing time of the power storage device can be shortened. In addition, by adjusting the pressure P2 in the second step, the occupation ratio of the gas space in the internal space of the case can be adjusted in advance. This makes it possible to easily control the amount of electrolyte injected.

  In the first step, a plurality of cases constrained to each other are accommodated in the chamber. In the third step, the liquid injection port in each case is immersed in the electrolytic solution. In the fourth step, the electrolytic solution is placed in each case. You may inject into. In this case, since the electrolytic solution can be injected into a plurality of cases at the same time, the manufacturing efficiency of the power storage device can be improved.

  In the second step, the inside of the chamber may be lowered to the pressure P3 lower than the pressure P2, and then the pressure may be raised to the pressure P2 by supplying gas into the chamber. In this case, a desired gas can be accurately introduced into the case.

  The pressure P2 may be 5% or more and 20% or less of the atmospheric pressure P1. In this case, it is possible to sufficiently ensure the life and performance of the power storage device, and to suppress the evaporation of the electrolyte in the chamber.

  The laminated body may constitute a bipolar electrode, and the diameter of the liquid injection port may be 3 mm or less. In this case, it is possible to suppress the electrolytic solution from being discharged out of the case through the injection port.

  The electrolytic solution is housed in a container installed below the case in the chamber, and the liquid injection port facing downward may be immersed in the electrolytic solution in the third step. In this case, since the part in contact with the electrolyte solution in the case can be reduced, the amount of the electrolyte solution accommodated in the chamber can be reduced.

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of the electrical storage apparatus which can control the injection amount of electrolyte solution can be provided, implement | achieving shortening of manufacturing time.

FIG. 1 is a schematic cross-sectional view showing the configuration of the power storage device according to the present embodiment. FIG. 2 is a process diagram for explaining a method of manufacturing the power storage device. FIG. 3A is a schematic diagram for explaining the first step, and FIG. 3B is a schematic diagram for explaining the third step. FIG. 4 is a schematic diagram showing a method for injecting an electrolytic solution in a comparative example. FIG. 5 is a process diagram showing a second process according to the first modification. FIG. 6 is a schematic diagram for explaining the third step when the case according to the second modification is used.

  Hereinafter, a preferred embodiment of a method for manufacturing a power storage device according to one aspect of the present invention will be described in detail with reference to the drawings. In the following description, the same reference numerals are used for the same elements or elements having the same functions, and redundant description is omitted.

  FIG. 1 is a schematic cross-sectional view showing the configuration of the power storage device according to the present embodiment. The power storage device 1 shown in the figure is a bipolar battery including a laminated body 2 of bipolar electrodes 3. The power storage device 1 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. The power storage device 1 is used as a battery for various vehicles such as forklifts, hybrid vehicles, and electric vehicles. In the following description, a nickel metal hydride secondary battery is illustrated.

  The power storage device 1 includes the laminated body 2 of the bipolar electrode 3 described above, a frame body 4 that houses the laminated body 2, and a restraining member 5 that restrains the laminated body 2.

  The laminate 2 is configured by laminating a plurality of bipolar electrodes 3 with separators 6 interposed therebetween. Each of the bipolar electrodes 3 has at least a positive electrode 12 and a negative electrode 13. More specifically, each bipolar electrode 3 includes an electrode plate 11, a positive electrode 12 provided on one surface 11 a of the electrode plate 11, and a negative electrode 13 provided on the other surface 11 b of the electrode plate 11. Yes. In the stacked body 2, the positive electrode 12 of one bipolar electrode 3 faces the negative electrode 13 of one bipolar electrode 3 adjacent in the stacking direction across the separator 6, and the negative electrode 13 of one bipolar electrode 3 It faces the positive electrode 12 of the other bipolar electrode adjacent in the stacking direction.

  The electrode plate 11 is a metal foil made of nickel, for example. The thickness of the electrode plate 11 is, for example, about 0.1 μm to 1000 μm. An example of the positive electrode active material constituting the positive electrode 12 is nickel hydroxide. An example of the negative electrode active material constituting the negative electrode 13 is a hydrogen storage alloy. The formation region of the negative electrode 13 on the other surface 11 b of the electrode plate 11 may be slightly larger than the formation region of the positive electrode 12 on the one surface 11 a of the electrode plate 11.

  The edge portion 11 c of the electrode plate 11 is an uncoated region where the positive electrode active material and the negative electrode active material are not applied, and is held by the frame body 4 while being embedded in the inner wall 4 a of the frame body 4. Thereby, a space partitioned by the electrode plates 11 and 11 and the inner wall 4a of the frame body 4 is formed between the electrode plates 11 and 11 adjacent in the stacking direction. In the space, an electrolytic solution (not shown) made of an alkaline solution such as an aqueous potassium hydroxide solution is accommodated.

  An electrode plate 11A in which only the negative electrode 13 is provided on one side is laminated on one laminated end of the laminated body 2 (upper laminated end in FIG. 1). The electrode plate 11A is arranged so that the negative electrode 13 and the positive electrode 12 of the uppermost bipolar electrode 3 face each other with the separator 6 interposed therebetween. In addition, an electrode plate 11B provided with only the positive electrode 12 on one side is stacked on the other stacked end of the stacked body 2 (lower stacked end in FIG. 1). The electrode plate 11B is arranged so that the positive electrode 12 and the negative electrode 13 of the lowermost bipolar electrode 3 face each other with the separator 6 interposed therebetween. The edge portions of the electrode plates 11 </ b> A and 11 </ b> B are held by the frame body 4 in a state of being buried in the inner wall 4 a of the frame body 4, similarly to the electrode plate 11 of the bipolar electrode 3. The electrode plates 11A and 11B may be formed thicker than the electrode plate 11 of the bipolar electrode 3. For example, the thickness of the electrode plates 11A and 11B is preferably a thickness that does not deform or is difficult to deform when the power storage device 1 is left in a vacuum atmosphere.

  The separator 6 is formed in a sheet shape, for example. Examples of the material for forming the separator include a porous film made of a polyolefin resin such as polyethylene (PE) and polypropylene (PP), a woven fabric or a nonwoven fabric made of polypropylene, polyethylene terephthalate (PET), methylcellulose, and the like. The separator 6 may be reinforced with a vinylidene fluoride resin compound. The separator 6 is not limited to a sheet shape, and may be a bag shape.

  The frame 4 is formed in a rectangular cylindrical shape by, for example, injection molding using an insulating resin. Examples of the resin material constituting the frame 4 include polypropylene (PP), polyphenylene sulfide (PPS), and modified polyphenylene ether (modified PPE). The frame body 4 is a member that surrounds and holds the side surface 2 a of the multilayer body 2 formed by the lamination of the bipolar electrodes 3. More specifically, the frame body 4 holds the edge portion 11c of the electrode plate 11 of the bipolar electrode 3 and the edge portions of the electrode plates 11A and 11B located at the stacking end of the stacked body 2, and the bipolar electrode 3, The space in which the electrolyte formed between the three is accommodated is sealed. In other words, the electrode plates 11 </ b> A and 11 </ b> B and the frame body 4 define a case C that forms a space (internal space) that houses the multilayer body 2 and the electrolytic solution. A part of the frame 4 in the case C is provided with a liquid injection port 1a (see FIGS. 3A and 3B described later) for injecting the electrolytic solution into the internal space. The diameter (diameter) of the liquid injection port 1a is, for example, 3 mm or less. In this case, it is possible to prevent the electrolyte from being discharged out of the case C from the liquid injection port 1a due to the surface tension of the electrolyte.

  When the frame body 4 is formed of a resin material, the frame body 4 has a rigidity that does not deform or is difficult to deform when the power storage device 1 is left in a vacuum atmosphere.

  The restraining member 5 includes a pair of restraining plates 21 and 21 and connecting members (bolts 22 and nuts 23) that join the restraining plates 21 and 21 together. The restraint plate 21 is formed in a flat plate shape with a metal such as iron. An insertion hole 21 a through which the bolt 22 is inserted is provided at a position on the outer side of the frame body 4 at the edge of the restraint plate 21. Further, a current collecting plate 25 (25A, 25B) is coupled to one surface side of the restraining plate 21 via an insulating member 24. Thereby, the restraining plate 21 is a restraining plate with a current collecting plate that serves both as a restraining function and a current collecting function. Examples of the material for forming the insulating member 24 interposed between the restraint plate 21 and the current collector plate 25 include urethane resin, epoxy resin, polypropylene, PA66, and the like.

  One restraint plate 21 is abutted against one end surface of the frame body 4 so that the current collector plate 25 </ b> A and the electrode plate 11 </ b> A are in contact with each other inside the frame body 4, and the other restraint plate 21 is disposed inside the frame body 4. The current collector plate 25B and the electrode plate 11B are abutted against the other end surface of the frame body 4 so as to contact each other. For example, the bolt 22 is passed through the insertion hole 21a from one restraint plate 21 side to the other restraint plate 21 side, and a nut 23 is screwed onto the tip of the bolt 22 protruding from the other restraint plate 21. Yes.

  Thereby, the laminate 2, the electrode plates 11A and 11B, and the frame 4 are sandwiched and unitized, and a restraining load is applied. Further, the current collector plates 25A and 25B are disposed between the constraining plate 21 and the stacked body 2 so as to sandwich the stacked body 2 in the stacking direction. A positive electrode terminal 26 is connected to the current collector plate 25A, and a negative electrode terminal 27 is connected to the current collector plate 25B. The power storage device 1 can be charged and discharged by the positive electrode terminal 26 and the negative electrode terminal 27.

  Next, an example of a method for manufacturing the power storage device 1 described above will be described in detail with reference to FIGS. 2 and 3A and 3B. FIG. 2 is a process diagram for explaining a method of manufacturing the power storage device. FIG. 3A is a schematic diagram for explaining the first step, and FIG. 3B is a schematic diagram for explaining the third step.

  First, as shown in FIG. 2, the case C in which the stacked body 2 is accommodated is accommodated in the chamber 31 (first step S1). As shown in FIG. 3A, in the first step S <b> 1, a plurality of cases C constrained to each other are accommodated in the chamber 31. A container 32 is disposed below the plurality of cases C in the chamber 31. The container 32 contains the electrolytic solution E, and the upper end thereof is opened. The case C is accommodated in the chamber 31 so that the liquid injection port 1a of each case C faces the container 32 and faces downward. In the chamber 31, the case C is supported by, for example, an arm (not shown) that can be driven in the vertical direction.

The gas in the chamber 31 may be air or an inert gas such as nitrogen. In the first step S1, the inside of the chamber 31 in which the case C and the container 32 are accommodated is set to the atmospheric pressure P1. The atmospheric pressure P1 may be about 1 × 10 ⁵ Pa (about 0.1 MPa).

Next, the pressure in the chamber 31 is lowered to a pressure P2 lower than the atmospheric pressure P1 (second step S2). In the second step S2, the inside of the chamber 31 is decompressed using the pump 33 connected to the chamber 31. The pressure P2 is set to be larger than the pressure that can fill the internal space of the case C with the electrolyte E. The pressure that can fill the internal space of the case C with the electrolytic solution E means that the internal space of the case C is substantially completely filled with the electrolytic solution E after the third step S3 and the fourth step S4 described later. It is the pressure that can be. This pressure is, for example, in the range of high vacuum (0.1 to 10 ⁻⁵ Pa) or ultra high vacuum (10 ⁻⁵ Pa).

  The amount of gas accommodated in the remaining space in the case C in the chamber 31 is adjusted by lowering the inside of the chamber 31 to the pressure P2 in the second step S2. Specifically, when the amount of gas accommodated in the remaining space of the case C at the atmospheric pressure P1 is α and the amount of gas β accommodated in the internal space of the case C at the pressure P2, the remaining space of the case C The amount of gas accommodated in is reduced by β / α times (pressure P2 / atmospheric pressure P1 times) compared to the case where the pressure is atmospheric pressure P1. This is because the amount of gas accommodated in the remaining space (or in the chamber 31) of the case C and the pressure in the remaining space (or in the chamber 31) are substantially proportional to each other. The remaining space is a space other than the region occupied by the contents (that is, the laminate 2) in the internal space of the case C. The remaining space includes a gap provided in the laminate 2 (for example, a gap in the separator 6 when the separator 6 is porous). In addition, the amount of gas accommodated in the remaining space of the case C after the second step S2 is not strictly β / α times, but about β / α times compared to the case where the atmospheric pressure P1. Good.

  From the viewpoint of securing the gas accommodated in the case C (that is, from the viewpoint of securing the life of the power storage device 1), the pressure P2 is set to, for example, 5% or more of the atmospheric pressure P1. Further, from the viewpoint of housing sufficient electrolytic solution E in case C (that is, from the viewpoint of sufficiently exerting the performance of power storage device 1), pressure P2 is set to 20% or less of atmospheric pressure P1, for example. From the viewpoint of preventing volatilization of the electrolytic solution E in the chamber 31 (that is, from the viewpoint of adjusting the boiling point of the electrolytic solution E), the pressure P2 is set to 5% or more of the atmospheric pressure P1, for example. Therefore, it is preferable to set the pressure P2 to, for example, 5% or more and 20% or less of the atmospheric pressure P1. In this case, the amount of gas accommodated in the remaining space of the case C is 80% or more and 95% or less as compared with the case where the atmospheric pressure P1.

  Next, as shown in FIG. 3B, the liquid injection port 1a of the case C is immersed in the electrolytic solution E in a state where the inside of the chamber 31 is maintained at the pressure P2 (third step S3). In the third step S3, for example, the case C is moved to the container 32 side, so that the liquid injection port 1a in each case C is immersed in the electrolytic solution E.

  Next, the electrolyte solution E is injected into the case C from the injection port 1a by raising the pressure in the chamber 31 to the atmospheric pressure P1 while the injection port 1a is immersed in the electrolyte solution E (first). 4 steps S4). In 4th process S4, the pressure in the chamber 31 is gradually raised to atmospheric pressure P1 by injecting gas in the chamber 31 using the pump 33. FIG. At this time, a difference is generated between the pressure in the chamber 31 and the pressure in the case C, and the electrolytic solution E is injected into each case C. Thereby, the electrolyte E is accommodated in the remaining space of each case C. In the fourth step S4, leakage of the gas stored in the remaining space in each case C can be prevented by preventing the liquid injection port 1a from being exposed from the electrolytic solution E. A part of the remaining space is provided with a space in which the gas in the case C is accommodated. The volume of this space is equivalent to the volume of the remaining space minus the volume of the electrolyte E.

  Next, the case C is taken out from the chamber 31 (fifth step S5). The liquid injection port 1a of each case C taken out from the chamber 31 is closed by a lid or the like. This prevents the electrolyte E from leaking out of the case C. And the electrical storage apparatus 1 is manufactured by attaching the restraint member 5 to the case C with which the liquid injection port 1a was block | closed. Note that before the case C is taken out from the chamber 31, the liquid injection port 1a may be directed upward.

  Below, the effect produced by the manufacturing method of the electrical storage apparatus 1 which concerns on this embodiment is demonstrated, comparing with the method shown by FIG. FIG. 4 is a schematic diagram showing a method for injecting an electrolytic solution in a comparative example.

  As shown in FIG. 4, in the comparative example, a metering pump 41 having a discharge port 42 and a funnel 43 attached to the liquid injection port 1 a of each case C are provided in the chamber 31. The discharge port 42 is provided in the chamber 31 and discharges the electrolytic solution E supplied from the metering pump 41. In the comparative example, a predetermined amount of the electrolytic solution E is supplied into each funnel 43 using the metering pump 41 in the chamber 31 set in a reduced pressure state. The supplied electrolytic solution E is gradually poured into the case C. In such a comparative example, in order to supply the electrolyte solution E to the plurality of funnels 43 simultaneously, a plurality of discharge ports 42 and a control device for supplying an appropriate amount of the electrolyte solution E to each discharge port 42 are provided. Cost.

  On the other hand, according to the method for manufacturing power storage device 1 according to the present embodiment, in second step S2, pressure P2 is set to be larger than the pressure at which the internal space of case C can be filled with the electrolytic solution. . For this reason, gas remains in the internal space of case C after 2nd process S2. Then, by performing the third step S3 and the fourth step S4 in order, the electrolyte E can be injected into the internal space while the gas remains in the internal space of the case C. Thereby, both gas and electrolyte solution E can exist in the internal space of case C. Therefore, by adjusting the pressure P2 in the second step S2, the occupation ratio of the gas space in the internal space of the case C can be adjusted in advance. Thereby, the injection amount of the electrolytic solution E can be easily controlled.

  In the first step S1, a plurality of cases C constrained to each other are accommodated in the chamber 31, and in the third step S3, the liquid injection port 1a in each case C is immersed in the electrolyte E, and in the fourth step S4. The electrolytic solution E may be injected into each case C. In this case, since the electrolytic solution E can be injected into a plurality of cases C at the same time, the manufacturing efficiency of the power storage device 1 can be improved.

  The pressure P2 is 5% or more and 20% or less of the atmospheric pressure P1. For this reason, it is possible to sufficiently ensure the life and performance of the power storage device 1 and to suppress the evaporation of the electrolyte E in the chamber 31.

  The laminated body 2 constitutes a bipolar electrode 3, and the diameter of the liquid injection port 1a is 3 mm or less. In this case, it is possible to prevent the electrolytic solution E from being discharged out of the case C through the injection port 1a.

  The electrolytic solution E is accommodated in a container 32 installed below the case C in the chamber 31, and the injection port 1a facing downward is immersed in the electrolytic solution E in the third step S3. ing. For this reason, since the area which contacts the electrolyte solution E in case C can be reduced, the quantity of the electrolyte solution E accommodated in the chamber 31 can be reduced.

In addition, the manufacturing method of the electrical storage apparatus which concerns on this invention is not limited to the said embodiment. For example, in the second step S2, the pressure in the chamber 31 is simply reduced to the pressure P2, but this is not limitative. FIG. 5 is a process diagram showing a second process S2 according to the first modification. As shown in FIG. 5, in the second step S2 of the first modified example, first, the pressure in the chamber 31 is lowered to a pressure P3 lower than the pressure P2 (step S21). In step S21, the pressure P3 only needs to be lower than the pressure P2, and may be in a high vacuum state (for example, 1 × 10 ⁻¹ Pa or less). Next, by supplying gas into the chamber 31, the pressure in the chamber 31 is raised to the pressure P2 (step S22). In step S22, the gas supplied by the pump 33 may be air or an inert gas such as nitrogen. According to the 1st modification, while having the same operation effect as the above-mentioned embodiment, the inside of chamber 31 can be accurately set to pressure P2 in the 2nd process S2. Further, a desired gas can be introduced into the case C with high accuracy. In the case where volatilization of the electrolytic solution E occurs at the pressure P3, the electrolytic solution E is not stored in the container 32 in advance, but may be supplied from the outside after reaching the pressure P2 at which volatilization does not occur. .

  Moreover, in the said embodiment, you may change suitably the position of the liquid injection hole 1a provided in case C. FIG. FIG. 6 is a schematic diagram for explaining the third step when the case C1 according to the second modification is used. As shown in FIG. 6, the liquid injection port 1a may be provided around the corner portion of the case C1. In this case, it is preferable that the case C1 in the chamber 31 is tilted and supported so that each corner of the case C1 is closest to the electrolyte E at the corner closest to the liquid injection port 1a. Thereby, the part which contacts the electrolyte solution E in case C can be reduced more.

  Moreover, in the said embodiment, although the nickel hydride secondary battery is illustrated as the electrical storage apparatus 1, as mentioned above, the electrical storage apparatus 1 is not restricted to a nickel hydride secondary battery. For this reason, the case C is provided by the frame 4 and the electrode plates 11A and 11B, but is not limited thereto. For example, a case made of metal or resin surrounding the frame 4 and the electrode plates 11A and 11B may be used as the case C. In this case, at least one of the frame body 4 and the electrode plates 11A and 11B may not be included in the power storage device. Note that the metal or resin case preferably has a rigidity that does not deform or is not easily deformed when the power storage device 1 is left in a vacuum atmosphere.

  DESCRIPTION OF SYMBOLS 1 ... Power storage device, 1a ... Injection hole, 2 ... Laminated body, 2a ... Side surface, 3 ... Bipolar electrode, 4 ... Frame, 6 ... Separator, 11, 11A, 11B ... Electrode plate, 11a ... One side, 11b ... The other surface, 12 ... positive electrode, 13 ... negative electrode, 31 ... chamber, 32 ... container, 33 ... pump, C ... case, E ... electrolyte.

Claims (6)

A first step of accommodating a laminate having at least a positive electrode and a negative electrode, and accommodating a case provided with an electrolyte injection port in the chamber;
A second step of lowering the pressure in the chamber to a pressure P2 lower than the atmospheric pressure P1,
A third step of immersing the liquid injection port of the case in the electrolyte while maintaining the pressure P2 in the chamber;
By increasing the pressure in the chamber from the pressure P2 to the atmospheric pressure P1 in a state where the liquid injection port is immersed in the electrolytic solution, the electrolytic solution is injected into the case from the liquid injection port. A fourth step,
The pressure P2 is set to be larger than the pressure that can fill the internal space of the case with the electrolytic solution.
A method for manufacturing a power storage device. In the first step, a plurality of cases constrained to each other are accommodated in the chamber,
In the third step, the liquid injection port in each of the cases is immersed in the electrolytic solution,
The method for manufacturing a power storage device according to claim 1, wherein in the fourth step, the electrolytic solution is injected into each case.   3. The power storage according to claim 1, wherein, in the second step, the chamber is lowered to a pressure P <b> 3 lower than the pressure P <b> 2 and then raised to the pressure P <b> 2 by supplying a gas into the chamber. Device manufacturing method.   The said pressure P2 is a manufacturing method of the electrical storage apparatus as described in any one of Claims 1-3 which is 5% or more and 20% or less of the said atmospheric pressure P1. The laminate constitutes a bipolar electrode,
The diameter of the said liquid injection port is a manufacturing method of the electrical storage apparatus as described in any one of Claims 1-4 which is 3 mm or less. The electrolytic solution is contained in a container installed below the case in the chamber,
The method for manufacturing a power storage device according to any one of claims 1 to 5, wherein, in the third step, the liquid injection port facing downward is immersed in the electrolytic solution.

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