JP7116633B2 - Power storage module, power storage device, and method for manufacturing power storage device - Google Patents

Description

The present invention relates to an electricity storage module, an electricity storage device, and a method for manufacturing an electricity storage device.

A power storage module (bipolar battery) is known that includes a bipolar electrode in which a positive electrode is formed on one side of a current collector and a negative electrode is formed on the other side. For example, in the power storage device (assembled battery) described in Patent Document 1, the power storage modules as described above are electrically stacked in series or in parallel, and the power storage modules adjacent to each other are connected by conductive plates (having conductivity). layer).

JP 2007-122977 A

In the power storage device as described above, the power storage modules are stacked in one direction and bound together. At this time, by arranging a conductive plate between the adjacent power storage modules, the adjacent power storage modules are electrically connected (hereinafter, such a work process is simply referred to as "integration"). However, the power storage module does not have a portion for positioning the conductive plate. For this reason, it takes time to position the conductive plates when they are integrated.

An object of the present invention is to provide an electricity storage module, an electricity storage device, and a method for manufacturing an electricity storage device that can improve workability when integrating electricity storage modules.

A power storage module according to the present invention comprises: a bipolar electrode group in which bipolar electrodes each including an electrode plate having a positive electrode layer formed on one surface and a negative electrode layer formed on the other surface are laminated in one direction with a separator interposed therebetween; A first terminal electrode consisting of an electrode plate arranged at one end of the bipolar electrode group in one direction via a separator and having a positive electrode layer formed on the surface facing the bipolar electrode group, and at the other end of the bipolar electrode group in one direction a second terminal electrode consisting of an electrode plate having a negative electrode layer formed on a surface facing the bipolar electrode group and arranged with a separator interposed therebetween; a conductive plate having a plurality of holes arranged in contact with at least one side and extending in a direction orthogonal to one direction; and a sealing body provided so as to surround a side surface of the laminate, comprises a plurality of frame-shaped first seal portions provided on the periphery of each electrode plate of a plurality of bipolar electrodes, a first terminal electrode, and a second terminal electrode; and a plurality of first seals laminated in one direction. a second sealing portion integrally surrounding the periphery of the portion, and the conductive plate is secured to the second sealing portion by a securing portion formed on a portion of the second sealing portion.

In the power storage module with this configuration, the conductive plate is fixed to the second seal portion by the fixing portion formed in a part of the second seal portion. That is, the conductive plate is integrated as an electricity storage module. As a result, in the process of manufacturing an electric storage device by stacking electric storage modules, there is no need to position separate conductors between adjacent electric storage modules. As a result, it is possible to improve the workability when integrating the power storage modules.

In the electric storage module according to the present invention, the fixing portion may fix the entire peripheral edge of the conductive plate. In this power storage module, the conductive plate can be more firmly fixed to the second seal portion.

In the electric storage module according to the present invention, the fixing portion may fix a part of the peripheral edge of the conductive plate. In this power storage module, the conductive plate can be more easily fixed to the second seal portion.

In the electric storage module according to the present invention, a plurality of conductive plates may be arranged in a direction orthogonal to one direction. When the conductive plate is formed from a plurality of members (conductive plates), it becomes more difficult to stack the power storage modules in one direction. With this power storage module, even in such a case, it is possible to improve workability when integrating the power storage module.

In the electricity storage module according to the present invention, the laminate further includes an uncoated electrode plate arranged outside the second terminal electrode, and the uncoated electrode plate is provided with the first sealing portion on the periphery thereof. good too. Here, for example, when the electrolytic solution is an alkaline solution, the electrolytic solution runs along the surface of the electrode plate of the negative terminal electrode and passes between the sealing body and the electrode plate due to the so-called alkali creep phenomenon. may bleed out to the outer surface side of the In this electricity storage module, since the seepage as described above can be suppressed, for example, corrosion of the conductive plate arranged adjacent to the negative terminal electrode, short circuit between the negative terminal electrode and the restraint member, and the like can be suppressed, and reliability can be improved. can be improved.

In the power storage module according to the present invention, the conductive plate may be arranged on the side of the second terminal electrode in one direction. Also in this case, it is possible to improve the workability when integrating the power storage modules.

A method for manufacturing a power storage device according to the present invention may include a first step of manufacturing the power storage module, and a second step of stacking the power storage modules manufactured in the first step in one direction. In this electricity storage device manufacturing method, since the electricity storage modules having the conductive plates fixed to the second seal portion by the fixing portion formed in a part of the second seal portion are stacked, separate bodies are formed between the adjacent electricity storage modules. Eliminates the task of locating and arranging conductors. As a result, it is possible to improve the workability when manufacturing the power storage device by integrating the power storage modules.

In the method for manufacturing a power storage device according to the present invention, when the conductive plate is fixed to the first seal portion in the first step, a masking process may be performed to cover the end portion of the hole. As a result, the hole is not blocked by the first seal portion during the manufacturing stage of the power storage module. As a result, a power storage device with excellent cooling performance can be provided.

ADVANTAGE OF THE INVENTION According to this invention, workability|operativity when integrating an electrical storage module can be improved.

1 is a schematic cross-sectional view showing a power storage device including power storage modules according to an embodiment; FIG. FIG. 2 is a schematic cross-sectional view showing an embodiment of the power storage module shown in FIG. 1; FIG. 2 is a perspective view showing the power storage module shown in FIG. 1; FIG. 2 is a plan view showing the power storage module shown in FIG. 1; 4 is a flow chart showing a method for manufacturing an electricity storage module and an electricity storage device according to one embodiment. FIG. 10 is a plan view showing a modification of the power storage module; FIG. 11 is a schematic cross-sectional view showing a further modified example of the power storage module;

An embodiment will now be described in detail with reference to the accompanying drawings. In the description of the drawings, the same reference numerals are used for the same or equivalent elements, and overlapping descriptions are omitted. 1 to 3 show an XYZ Cartesian coordinate system.

First, the configuration of the power storage device 10 including the power storage module 12 according to one embodiment will be described. A power storage device 10 shown in FIG. 1 is used as a battery for various vehicles such as forklifts, hybrid vehicles, and electric vehicles. The power storage module 12 is, for example, a bipolar battery. Examples of the power storage module 12 include secondary batteries such as nickel-hydrogen secondary batteries and lithium-ion secondary batteries, and electric double layer capacitors. In the following description, a nickel-metal hydride secondary battery is exemplified.

A plurality of power storage modules 12 are stacked via a conductive plate 14 such as a metal plate, for example. When viewed from the stacking direction D1 (Z direction), the power storage module 12 and the conductive plate 14 have, for example, a rectangular shape. Three conductive plates 14 are arranged in the X direction (see FIG. 3). Details of each power storage module 12 will be described later. The conductive plates 14 are also arranged outside the power storage modules 12 positioned at both ends in the stacking direction D1 of the power storage modules 12 . The conductive plate 14 is electrically connected to adjacent power storage modules 12 . Thereby, the plurality of power storage modules 12 are connected in series in the stacking direction D1.

A terminal member 24 is connected to the conductive plate 14 positioned at one end in the stacking direction D1, and a terminal member 26 is connected to the conductive plate 14 positioned at the other end. The terminal member 24 may be integrated with the conductive plate 14 to which it is connected. The terminal member 26 may be integrated with the conductive plate 14 to which it is connected. The terminal members 24 and 26 extend in a direction (X direction) substantially perpendicular to the stacking direction D1. Charging and discharging of the power storage device 10 can be performed by these terminal members 24 and 26 .

The conductive plate 14 can also function as a radiator plate for releasing heat generated in the power storage module 12 . Coolant such as air passes through the plurality of holes 14 a provided inside the conductive plate 14 , so that heat from the power storage module 12 can be efficiently released to the outside. Each hole 14a extends, for example, in a direction (Y direction) substantially orthogonal to the stacking direction D1. The conductive plate 14 is smaller than the power storage module 12 when viewed from the stacking direction D<b>1 , but may be the same as or larger than the power storage module 12 . As will be described in detail later, the conductive plate 14 is integrally formed as the electricity storage module 12 described later.

The power storage device 10 includes a restraining member 16 that restrains the alternately stacked power storage modules 12 and the conductive plates 14 in the stacking direction D1. The restraint member 16 includes a pair of restraint plates 16A and 16B, and a connecting member (bolt 18 and nut 20) that connects the restraint plates 16A and 16B. An insulating film 22 such as a resin film is arranged between each restraining plate 16A, 16B and the conductive plate 14 . Each restraining plate 16A, 16B is made of metal such as iron. Each of the constraining plates 16A and 16B and the insulating film 22 has, for example, a rectangular shape when viewed from the stacking direction D1. The insulating film 22 is larger than the conductive plate 14 and each of the constraining plates 16A, 16B is larger than the power storage module 12. As shown in FIG.

As viewed from the stacking direction D1, an insertion hole H1 through which the shaft of the bolt 18 is inserted is provided at a position outside the power storage module 12 at the edge of the restraining plate 16A. Similarly, when viewed from the stacking direction D1, an insertion hole H2 through which the shaft of the bolt 18 is inserted is provided at a position outside the power storage module 12 at the edge of the restraining plate 16B. When each constraining plate 16A, 16B has a rectangular shape when viewed from the stacking direction D1, the insertion holes H1 and H2 are positioned at the corners of the constraining plates 16A, 16B.

One constraining plate 16A abuts the conductive plate 14 connected to the terminal member 26 via the insulating film 22, and the other constraining plate 16B applies the insulating film 22 to the conductive plate 14 connected to the terminal member 24. being pushed through. The bolts 18 are passed through the insertion holes H1 from, for example, the one restraining plate 16A side toward the other restraining plate 16B side, and a nut 20 is screwed to the tip of the bolt 18 protruding from the other restraining plate 16B. there is As a result, the insulating film 22, the conductive plate 14, and the power storage module 12 are sandwiched and unitized, and a restraining load is applied in the stacking direction D1.

As shown in FIGS. 2 to 4, the power storage module 12 includes a laminate 30 including a bipolar electrode group 31, a first terminal electrode 39A, and a second terminal electrode 39B. The bipolar electrode group 31 comprises an electrode plate 34 having a positive electrode layer 36 formed on one surface and a negative electrode layer 38 formed on the other surface. It is The first terminal electrode 39A is arranged at one end of the bipolar electrode group 31 in the Z direction with a separator 40 interposed therebetween, and consists of an electrode plate 34 having a positive electrode layer 36 formed on the surface (inner surface) facing the bipolar electrode group 31. . The second terminating electrode 39B is arranged at the other end of the bipolar electrode group 31 in the Z direction with the separator 40 interposed therebetween, and the electrode plate 34 having the negative electrode layer 38 formed on the surface (inner surface) facing the bipolar electrode group 31. Become.

The laminate 30 has, for example, a rectangular shape when viewed from the lamination direction D1. In the laminate 30, the positive electrode layer 36 of one bipolar electrode 32 faces the negative electrode layer 38 of the one bipolar electrode 32 adjacent in the stacking direction D1 with the separator 40 interposed therebetween, and the negative electrode layer 38 of the one bipolar electrode 32 , the positive electrode layer 36 of the other bipolar electrode 32 adjacent in the stacking direction D1 with the separator 40 interposed therebetween. The positive electrode layer 36 of the first terminal electrode 39A faces the negative electrode layer 38 of the bottom bipolar electrode 32 with the separator 40 interposed therebetween. The negative electrode layer 38 of the second terminal electrode 39B faces the positive electrode layer 36 of the uppermost bipolar electrode 32 with the separator 40 interposed therebetween.

The electrode plate 34 is a rectangular metal foil made of nickel, for example. Alternatively, the electrode plate 34 may be a nickel plated steel plate. A peripheral edge portion 34a of the electrode plate 34 is an uncoated region where the positive electrode active material and the negative electrode active material are not coated, and the uncoated region is embedded in the first seal portion 52 forming the inner wall of the frame 50. It is an area that is held as Examples of the positive electrode active material forming the positive electrode layer 36 include nickel hydroxide. Examples of the negative electrode active material forming the negative electrode layer 38 include hydrogen storage alloys. The formation area of the negative electrode layer 38 on the other surface of the electrode plate 34 is one size larger than the formation area of the positive electrode layer 36 on the one surface of the electrode plate 34 .

The separator 40 is formed in a sheet shape, for example. The separator 40 is a member that prevents a short circuit between the adjacent bipolar electrodes 32,32. Examples of the material forming the separator 40 include porous films made of polyolefin resins such as polyethylene (PE) and polypropylene (PP), and woven or nonwoven fabrics made of polypropylene or the like. Moreover, the separator 40 may be reinforced with a vinylidene fluoride resin compound or the like.

The power storage module 12 includes a frame body (sealing body) 50 that holds the peripheral edge portion 34a of the electrode plate 34 on the side surface 30a of the laminate 30 extending in the stacking direction D1. The frame 50 is provided around the laminate 30 when viewed from the lamination direction D1. That is, the frame 50 is configured to surround the side surface 30 a of the laminate 30 . The frame body 50 includes a plurality of frame-shaped first seal portions 52 provided on the peripheral edges of the electrode plates 34 of the plurality of bipolar electrodes 32, the first terminal electrode 39A, and the second terminal electrode 39B, and the Z direction. and a second seal portion 54 that integrally surrounds the periphery of the plurality of stacked first seal portions 52 (surroundings of the first seal portions 52 when viewed from the stacking direction D1).

The first sealing portion 52 forming the inner wall of the frame 50 extends from one surface of the electrode plate 34 of each bipolar electrode 32 (here, the surface on which the positive electrode layer 36 is formed) to the end surface of the electrode plate 34 at the peripheral portion 34a. is provided. Each first seal portion 52 is provided over the entire peripheral edge portion 34 a of the electrode plate 34 of each bipolar electrode 32 when viewed from the stacking direction D<b>1 . Adjacent first seal portions 52 are welded together on the surface extending outside the other surface of the electrode plate 34 of each bipolar electrode 32 (here, the surface on which the negative electrode layer 38 is formed). As a result, the peripheral edge portion 34 a of the electrode plate 34 of each bipolar electrode 32 is buried and held in the first seal portion 52 .

As with the peripheral edge portions 34 a of the electrode plates 34 of the bipolar electrodes 32 , the peripheral edge portions 34 a of the electrode plates 34 of the first terminal electrode 39 A and the second terminal electrode 39 B arranged at both ends of the laminate 30 also have the first sealing portion 52 . It is kept buried in As for the first termination electrode 39A, a first sealing portion 52 is also provided on the outer surface (the surface connected to the conductive plate 14) of the first termination electrode 39A. That is, the peripheral edge portion 34a of the electrode plate 34 in the first terminal electrode 39A is formed by the first sealing portion 52 provided on the outer surface of the first terminal electrode 39A (the first sealing portion 52 provided at the bottom in FIG. 2). ) and the first sealing portion 52 provided on one surface of the first terminal electrode 39A.

The second seal portion 54 that forms the outer surface of the frame 50 includes a side surface portion 54a that covers the side surface of the first seal portion 52 and a ridge projecting inward from the side surface portion 54a in plan view in the stacking direction D1. and a protruding portion (fixed portion) 54b.

A plurality of internal spaces V hermetically partitioned by the electrode plates 34, 34 and the first seal portion 52 are formed between the electrode plates 34, 34 adjacent in the stacking direction D1. An electrolytic solution (not shown) made of an alkaline solution such as an aqueous potassium hydroxide solution is present in a part of the internal space V, for example.

One side surface 50s of the frame 50 is provided with a plurality of (here, four) valve mounting regions 50a to which the pressure regulating valves 60 are mounted. Each valve attachment region 50a of the first seal portion 52 is provided with a plurality of communication holes (not shown). This communication hole communicates with the internal space V of each cell of the power storage module 12 . The second seal portion 54 is also provided with a valve attachment region 50a. For this reason, the second seal portion 54 is provided with a plurality of holes connected to the communication holes.

The pressure regulating valve 60 is a member having a function of opening and closing according to the internal pressure of the internal space V to adjust the pressure (for example, opening when the internal pressure exceeds a predetermined value to release gas). The pressure regulating valve 60 is attached to the valve attachment area 50a. The hole and communication hole provided in the valve mounting region 50a can also be used as an injection port (electrolyte injection port) for injecting the electrolytic solution into the internal space V. As shown in FIG.

The frame body 50 (the first seal portion 52 and the second seal portion 54) is formed in a rectangular tubular shape from, for example, an insulating resin. Examples of the resin material forming the first seal portion 52 include acid-modified polypropylene. Examples of the resin material forming the first seal portion 52 include polyphenylene sulfide (PPS), modified polyphenylene ether (modified PPE), and the like.

The conductive plate 14 is arranged in contact with at least one of both ends of the laminate 30 (that is, the first terminal electrode 39A and the second terminal electrode 39B) in the Z direction. In this embodiment, the conductive plate 14 is arranged on the second terminal electrode 39B side in the Z direction. The conductive plate 14 is in contact with the electrode plate 34 via the conductive member 134 . The conductive plate 14 is welded (fixed) to the projecting portion 54 b of the second seal portion 54 . The contact portion of the electrode plate 34 with the second seal portion 54 is the edge portion 54c of the projecting portion 54b, and the entire contact portion is welded to the edge portion 54c. That is, the entire circumference of the outer shape of the electrode plate 34 is welded to the edge 54c of the projecting portion 54b. The conductive plate 14 is arranged inside the projecting portion 54b of the second seal portion 54 in plan view in the Z direction.

Next, a method for manufacturing power storage device 10 configured as described above will be described. As shown in FIG. 5, first, the power storage module 12 having the configuration described above is manufactured. A first step S1 for manufacturing the electric storage module 12 includes a laminate forming step S11, a conductive plate temporary fixing step S12, and a second sealing portion forming step S13.

In the laminated body forming step S11, the bipolar electrodes 32 with the frame-shaped first sealing portion 52 arranged on the peripheral edge portion 34a of the electrode plate 34 are laminated via the separator 40 to form the bipolar electrode group 31. Next, a first terminating electrode 39A and a second terminating electrode 39B are arranged at both ends of the bipolar electrode group 31 with a separator 40 interposed therebetween, and when these are welded and integrated, an intermediate body that becomes the laminate 30 is formed. do. Next, the laminated body 30 is placed in a hot plate welding machine, and the first seal portions 52 and the electrode plate 34 are welded together, and the first seal portions 52 are welded together to form the laminated body 30 .

The conductive plate temporary fixing step S12 positions the conductive plate 14 with respect to the first seal portion 52 provided on the second terminal electrode 39B. Specifically, the conductive plate temporary fixing step S<b>12 temporarily fixes the conductive plate 14 to the first seal portion 52 provided on the second terminal electrode 39</b>B in the laminate 30 . In this embodiment, three conductive plates 14 are arranged in the X direction and temporarily fixed. The operation of temporarily fixing the conductive plate 14 to the first seal portion 52 provided on the second terminal electrode 39B may be performed at the same time as the laminate forming step S11. That is, it may be carried out at the same time as the laminate 30 is formed. In this embodiment, since the first seal portion 52 is made of acid-modified polypropylene, the first seal portion 52 and the conductive plate 14 are temporarily fixed by thermal welding. Instead of temporarily fixing the conductive plate 14, the conductive plate 14 may be positioned on the first seal portion 52 provided on the second terminal electrode 39B using a jig or the like.

In the conductive plate temporary fixing step S<b>12 , a masking process is performed to cover the end portion of the hole 14 a of the conductive plate 14 . Examples of masking include application of masking tape, placement of nests, and the like.

The second seal portion forming step S13 integrally surrounds the periphery of the first seal portion 52 . In this embodiment, the second seal portion 54 is formed by, for example, injection molding. The second seal portion 54 is formed by placing a mold around the periphery of the first seal portion 52 and pouring the fluid resin material of the second seal portion 54 into the mold. In this embodiment, the conductive plate 14 is welded by the projecting portion 54 b of the second seal portion 54 . Thereby, as shown in FIG. 2, the electric storage module 12 having the conductive plate 14 fixed to one end in the stacking direction D1 is formed. At the same time, the storage module 12 is formed with the conductive plate 14 fixed to one end in the stacking direction D1. Although details are omitted, the power storage module 12 as shown in FIG. 3 is formed through the liquid injection process and the pressure control valve mounting process.

Next, power storage device 10 having the configuration described above is manufactured. The second step S2 for manufacturing the power storage device 10 includes a power storage module stacking step S21 and an array body restraining step S22.

In the storage module stacking step S21, the storage modules 12 manufactured in the first step S1 are stacked in one direction to form an array. Since the conductive plate 14 is arranged only on one side of the power storage module 12 in the Z direction, a separate conductive plate 14 is arranged on the other end side of the array. As a result, an array in which the conductive plates 14, 14 are arranged at both ends in the Z direction is formed.

Next, a pair of restraining plates 16A and 16B are placed on both ends of the array thus formed via insulating films 22, and the restraining plates 16A and 16B are connected to each other by connecting members (bolts 18 and nuts 20). connect. As a result, the insulating film 22, the conductive plate 14, and the power storage module 12 are sandwiched and integrated (unitized), and a binding load is applied in the stacking direction D1.

Effects of the power storage module 12 and the power storage device 10 of the above embodiment will be described. As shown in FIGS. 2 and 3 , in the power storage module 12 of the above embodiment, the conductive plate 14 is welded to the overhanging portion 54 b of the second seal portion 54 . That is, the conductive plate 14 is integrated as the power storage module 12 . As a result, in the process of manufacturing the power storage device 10 by stacking the power storage modules 12, the work of positioning and arranging the separate conductive plates 14 between the adjacent power storage modules 12, 12 is eliminated. Thereby, it is possible to improve the workability when integrating the power storage modules 12 .

In the power storage module 12 of the above embodiment, a plurality (three) of conductive plates 14 are arranged in the X direction orthogonal to the Z direction. When the conductive plate 14 is formed from a plurality of members (conductive plates 14 ) in this way, it becomes more difficult to stack the power storage modules 12 in one direction. Even in such a case, the power storage module 12 of the above embodiment can improve workability when integrating the power storage module 12 .

In the electricity storage module 12 of the above-described embodiment, the conductive plate 14 is arranged on the second terminal electrode 39B side in the Z direction, and in this case as well, workability when integrating the electricity storage module 12 can be improved. .

In the power storage device 10 of the above embodiment, the plurality of power storage modules 12 described above are stacked in the Z direction. In the power storage device 10 having this configuration, in the power storage module lamination step S21 for stacking the power storage modules 12 to which the conductive plates 14 are welded, there is no need to position and dispose the separate conductive plates 14 between the adjacent power storage modules 12, 12. , the simple work of stacking the electric storage modules 12 integrated with the conductive plates 14 . This makes it possible to improve workability when manufacturing the power storage device 10 by integrating the power storage modules 12 .

In the method for manufacturing the power storage device 10 of the above-described embodiment, the power storage modules 12 having the conductive plates 14 welded to the first seal portions 52 are stacked, so that the separate conductive plates 14 are positioned between the adjacent power storage modules 12, 12. No more work to place. Thereby, it is possible to improve the workability when integrating the power storage modules 12 .

In the method for manufacturing the power storage device 10 of the above embodiment, the first seal portion 52 to which the conductive plate 14 is welded is made of acid-modified polypropylene, and the conductive plate 14 is heat-sealed to the first seal portion 52. It is temporarily fixed by Therefore, the operation of temporarily fixing the conductive plate 14 to the first seal portion 52 is facilitated.

In the method for manufacturing the power storage device 10 of the above-described embodiment, when the conductive plate 14 is welded to the first seal portion 52 in the first step S1, mask processing is performed to cover the end portion of the hole portion 14a. As a result, the hole portion 14 a is not blocked by the first seal portion 52 during the manufacturing stage of the power storage module 12 . As a result, it is possible to provide the power storage module 12 and the power storage device 10 with excellent cooling performance.

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

In the above embodiment, an example in which the frame 50 (the first seal portion 52 and the second seal portion 54) is formed from acid-modified polypropylene was described, but polyphenylene sulfide (PPS) or modified polyphenylene ether (modified PPE) ), etc. In this case, the conductive plate 14 may be temporarily fixed to the first seal portion 52 with an adhesive, a seal, or the like.

In the above-described embodiment and modification, an example in which the entire circumference of the outer shape of the electrode plate 34 is welded to the edge 54c of the projecting portion 54b has been described, but the present invention is not limited to this. For example, as shown in FIG. 6, the second seal portion 54 is provided with a fixing portion 54d that projects further inward from the projecting portion 54b, and the conductive plate 14 is welded by an edge portion 54e of the fixing portion 54d. good too. That is, a part of the outer shape of the electrode plate 34 may be welded to the edge portion 54e of the fixing portion 54d.

As shown in FIG. 7, in addition to the configurations of the above embodiments and modifications, the laminate 30 of the electricity storage module 12 includes an uncoated electrode plate 33 arranged outside the second terminal electrode 39B. good too. A first seal portion 52 is provided on the peripheral edge portion 33 a of the uncoated electrode plate 33 , and the first seal portion 52 is also integrally held by a second seal portion 54 . The conductive plate 14 is welded (fixed) to the projecting portion 54b of the second seal portion 54, as in the above-described embodiment. In the above-described embodiment and modification, the electrolytic solution is an alkaline solution. Therefore, due to the so-called alkaline creep phenomenon, the electrolytic solution runs along the surface of the electrode plate 34 of the second terminal electrode 39B, and the first sealing portion 52 and the conductive plate 14 are separated. may leak out to the outer surface side of the conductive plate 14 through the gap. In the electricity storage module 12 according to this modification, the seepage as described above can be suppressed. A short circuit or the like can be suppressed, and reliability can be improved.

In the modified example above, an example in which the uncoated electrode plate 33 is arranged adjacent to the second terminal electrode 39B has been described. Alternatively, the uncoated electrode plate 33 may be arranged. Also in this case, the same effect as described above can be obtained.

In the above-described embodiment and modification, as shown in FIG. 3, three conductive plates 14 are arranged in the X direction. Two or four or more conductive plates 14 may be arranged.

In the above-described embodiment and modifications, as shown in FIGS. 2 and 3, the conductive plate 14 is fixed to only one side of the power storage module 12 in the stacking direction D1. It may be a configuration that is fixed to the. When integrated as the power storage device 10, power storage modules having a configuration in which the conductive plates 14 are fixed to both sides in the stacking direction D1 and power storage modules having a configuration in which the conductive plates 14 are not fixed may be alternately stacked. .

In the above-described embodiment and modified example, the example in which the frame 50 is formed by welding the first seal portion 52 to the peripheral edge of the electrode plate 34 has been described. A body 50 may be formed.

In the above embodiments and modifications, the method for manufacturing a nickel-metal hydride battery has been described, but the method may also be applied to a method for manufacturing a lithium-ion secondary battery. In this case, the configuration may include a laminate in which an electrode plate having a positive electrode formed thereon and an electrode plate having a negative electrode formed thereon are laminated with a separator interposed therebetween. Examples of positive electrode active materials include composite oxides, metallic lithium, and sulfur. Examples of the negative electrode active material include graphite, highly oriented graphite, mesocarbon microbeads, carbon such as hard carbon and soft carbon, alkali metals such as lithium and sodium, metal compounds, and SiOx (0.5≦x≦1.5). and other metal oxides, boron-added carbon, and the like. A stainless steel foil or the like can be used for the electrode plate.

REFERENCE SIGNS LIST 10 power storage device 12 power storage module 14 conductive plate 14a hole 30 laminate 31 bipolar electrode group 32 bipolar electrode 33 uncoated electrode plate 34 electrode plate 36 Positive electrode layer 38 Negative electrode layer 39A First terminal electrode 39B Second terminal electrode 40 Separator 50 Frame 52 First seal portion 54 Second seal portion 54a Side portion , 54b... overhanging portion, 54c... edge, 54d... fixing portion, 54e... edge, S1... first step, S11... laminate forming step, S12... conductive plate temporary fixing step, S13... second sealing portion formation Steps, S2...second step, S21...storage module laminating step, S22...array body constraining step, V...internal space.

Claims (9)

A bipolar electrode group in which a bipolar electrode consisting of an electrode plate having a positive electrode layer formed on one surface and a negative electrode layer formed on the other surface is laminated in one direction with a separator interposed therebetween, and the bipolar electrode group in the one direction A first terminal electrode consisting of an electrode plate having a positive electrode layer formed on a surface facing the bipolar electrode group and arranged at one end with a separator interposed therebetween, and a separator interposed at the other end of the bipolar electrode group in the one direction a second terminal electrode consisting of an electrode plate having a negative electrode layer formed on a surface facing the bipolar electrode group;
a conductive plate disposed in contact with at least one of both ends of the laminate in the one direction and having a plurality of holes extending in a direction orthogonal to the one direction;
a sealing body provided so as to surround the side surface of the laminate,
The encapsulant is
a plurality of frame-shaped first seal portions provided on the periphery of each of the electrode plates of the plurality of bipolar electrodes, the first terminal electrode, and the second terminal electrode;
a second seal portion integrally surrounding the periphery of the plurality of first seal portions stacked in one direction;
The electric storage module, wherein the conductive plate is fixed to the second seal portion by a fixing portion formed on a part of the second seal portion. 2. The power storage module according to claim 1, wherein said fixing portion fixes the entire periphery of said conductive plate. 2. The power storage module according to claim 1, wherein said fixing portion fixes a part of the peripheral edge of said conductive plate. The power storage module according to any one of claims 1 to 3, wherein a plurality of said conductive plates are arranged in a direction orthogonal to said one direction. The laminate further includes an uncoated electrode plate disposed outside the second terminal electrode,
The power storage module according to any one of claims 1 to 4, wherein the first sealing portion is provided on the periphery of the uncoated electrode plate. The power storage module according to any one of claims 1 to 5, wherein the conductive plate is arranged on the side of the second terminal electrode in the one direction. An electricity storage device, wherein a plurality of electricity storage modules according to any one of claims 1 to 6 are stacked in the one direction. a first step of manufacturing the electricity storage module according to any one of claims 1 to 6;
a second step of stacking the power storage modules manufactured in the first step in one direction;
A method of manufacturing a power storage device, comprising: The first step is
At least one of the first seal portion arranged on the peripheral edge portion of the electrode plate of the first terminal electrode and the first seal portion arranged on the peripheral edge portion of the electrode plate of the second terminal electrode in the laminate has the A conductive plate temporary fixing step of temporarily fixing by fixing the conductive plate;
In a step after the temporary fixing step, the second seal portion is formed to integrally surround the peripheral edges of the plurality of first seal portions stacked in one direction, and the second seal portion is provided with the conductive material. a second sealing portion forming step of fixing the conductive plate temporarily fixed in the plate temporary fixing step;
9. The method of manufacturing a power storage device according to claim 8 , wherein in said conductive plate temporary fixing step, a masking process is performed to cover an end portion of said hole of said conductive plate .

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