JP2018067382A - Power storage device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power storage device in which the displacement between adjacent bipolar electrodes is suppressed.SOLUTION: A power storage device 10 comprises a plurality of bipolar electrodes 12 laminated. Each bipolar electrode 12 has: a current collector 16 having a first face 16a and a second face 16b on a side opposite to the first face 16a; a positive electrode layer 18 provided on the first face 16a; and a negative electrode layer 20 provided on the second face 16b. The power storage device 10 further comprises: a resin member 28 provided on at least one face of the first face 16a and the second face 16b in at least a part of an outer peripheral portion 161 of the current collector 16; an insulative case 30 provided on the resin members 28, and supporting the outer peripheral portions 161 of the current collectors 16 through the resin members 28; and a resin member 128 serving to join the resin members 28 of adjacent bipolar electrodes 12 to each other in a lamination direction of the plurality of bipolar electrodes 12.SELECTED DRAWING: Figure 3

Description

  One aspect of the present invention relates to a power storage device.

  A bipolar battery is known that includes a bipolar electrode in which a positive electrode is formed on one surface of a current collector and a negative electrode is formed on the other surface. In a bipolar battery, a plurality of bipolar electrodes are stacked in series across an electrolyte layer.

  For example, in the bipolar battery disclosed in Patent Document 1, a polypropylene layer covers the periphery of a bipolar plate (current collector) using a metal such as nickel. A polypropylene layer and a polypropylene cell casing for supporting a plurality of current collectors are fixed together by integral molding. When the polypropylene layer and the cell casing are integrally molded, a bipolar plate coated with the polypropylene layer is placed in a mold, and the polypropylene is injected into the mold to perform injection molding (insert molding method).

JP 2005-135664 A

  When injection molding is performed by laminating a plurality of bipolar plates in a mold, positional deviation may occur between the adjacent bipolar plates due to the pressure of polypropylene flowing into the mold.

  An object of one embodiment of the present invention is to provide a power storage device in which positional deviation between adjacent bipolar electrodes is suppressed.

  The power storage device according to one aspect of the present invention includes a plurality of stacked bipolar electrodes, and each of the plurality of bipolar electrodes has a first surface and a second surface opposite to the first surface. A plurality of bipolar electrodes, and an outer periphery of the current collector, the current collector having a current collector, a positive electrode layer provided on the first surface, and a negative electrode layer provided on the second surface A first resin member provided on at least one of the first surface and the second surface, and provided on the first resin member in at least a part of the portion; A second resin member that supports the outer peripheral portion of the current collector via a resin member and a first resin member that connects each of the first resin members of the bipolar electrodes adjacent in the stacking direction of the plurality of bipolar electrodes. 3 resin members.

  In the power storage device described above, the first resin members of the bipolar electrodes adjacent in the stacking direction of the plurality of bipolar electrodes are connected by the third resin member. Therefore, even when pressure is applied to the bipolar electrode when forming the second resin member, it is possible to suppress positional deviation between adjacent bipolar electrodes.

  The first resin member is provided with a through-hole penetrating the first resin member in the stacking direction of the plurality of bipolar electrodes, and the third resin member passes through the through-hole. Good.

  In this case, misalignment between adjacent first resin members is suppressed in a direction orthogonal to the stacking direction of the plurality of bipolar electrodes.

  The first resin member may be provided with a plurality of through holes, and the third resin member may penetrate each of the plurality of through holes.

  In this case, the effect of suppressing displacement is greater than in the case of one through hole.

  The first resin member has an outer portion located outside the through hole when viewed from the stacking direction of the plurality of bipolar electrodes, and the through hole is the outer peripheral portion of the current collector. And the outer portion.

  In this case, it can suppress that a 3rd resin member moves to the outer side of a through-hole.

  When viewed from the stacking direction of the plurality of bipolar electrodes, the first resin member may have an inner portion located between the outer peripheral portion of the current collector and the through hole.

  In this case, it can suppress that a 3rd resin member moves to the inner side of a through-hole. Therefore, it is possible to suppress the outer peripheral portion of the current collector from being deformed by the third resin member.

  The third resin member may be provided on an end surface of the first resin member when viewed from the stacking direction of the plurality of bipolar electrodes.

  The third resin member may be disposed on each side of the current collector having a rectangular shape when viewed from the stacking direction of the plurality of bipolar electrodes.

  In this case, compared with the case where the 3rd resin member is arrange | positioned at each vertex of an electrical power collector, the effect which suppresses the position shift between adjacent bipolar electrodes is large.

  According to one aspect of the present invention, a power storage device in which positional deviation between adjacent bipolar electrodes is suppressed can be provided.

It is sectional drawing which shows typically the electrical storage apparatus which concerns on embodiment. It is an exploded perspective view showing typically a part of power storage device concerning an embodiment. It is an expanded sectional view of the 1st resin member, the 2nd resin member, and the 3rd resin member. It is sectional drawing of the electrical storage apparatus along the IV-IV line of FIG. It is sectional drawing of the electrical storage apparatus which has the 3rd resin member which concerns on a modification. It is sectional drawing of the electrical storage apparatus which has the 3rd resin member which concerns on a modification. It is an expanded sectional view of the 1st resin member concerning the modification, the 2nd resin member, and the 3rd resin member. It is sectional drawing which shows 1 process of the manufacturing method of the electrical storage apparatus which concerns on embodiment. It is sectional drawing which shows 1 process of the manufacturing method of the electrical storage apparatus which concerns on embodiment. It is sectional drawing which shows 1 process of the manufacturing method of the electrical storage apparatus which concerns on embodiment.

  Hereinafter, embodiments of the present invention will 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 redundant descriptions are omitted. In the drawing, an XYZ orthogonal coordinate system is shown as necessary.

  FIG. 1 is a cross-sectional view schematically showing the power storage device according to the embodiment. FIG. 2 is an exploded perspective view schematically showing a part of the power storage device according to the embodiment. The power storage device 10 shown in FIG. 1 may be a secondary battery such as a nickel hydride secondary battery or a lithium ion secondary battery, or may be an electric double layer capacitor. The power storage device 10 can be mounted on a vehicle such as a forklift, a hybrid vehicle, or an electric vehicle.

  The power storage device 10 includes a plurality of bipolar electrodes 12. The plurality of bipolar electrodes 12 are stacked in series via the separator 14. Each of the bipolar electrodes 12 includes a current collector 16 having a first surface 16a and a second surface 16b opposite to the first surface 16a, and a positive electrode layer 18 provided on the first surface 16a. And a negative electrode layer 20 provided on the second surface 16b. The positive electrode layer 18 and the negative electrode layer 20 extend along a plane (for example, an XY plane) that intersects the stacking direction of the plurality of bipolar electrodes 12 (hereinafter also referred to as the Z-axis direction).

  The separator 14 may be a sheet shape or a bag shape. The separator 14 is a porous film or a nonwoven fabric, for example. The separator 14 can permeate the electrolytic solution. Examples of the material of the separator 14 include polyolefins such as polyethylene and polypropylene, polyamides such as polyimide and aramid fibers, and the like. Moreover, the separator 14 reinforced with the vinylidene fluoride resin compound may be used. As the electrolytic solution, for example, an alkaline solution such as an aqueous potassium hydroxide solution can be used.

The current collector 16 may be a metal foil such as a nickel foil, or may be a conductive resin member such as a conductive resin film. The thickness of the current collector 16 is, for example, 0.1 to 1000 μm. The positive electrode layer 18 includes a positive electrode active material. When the power storage device 10 is a nickel metal hydride secondary battery, the positive electrode active material is, for example, nickel hydroxide (Ni (OH) ₂ ) particles. When the power storage device 10 is a lithium ion secondary battery, the positive electrode active material is, for example, a composite oxide, metallic lithium, sulfur, or the like. The negative electrode layer 20 includes a negative electrode active material. When the power storage device 10 is a nickel metal hydride secondary battery, the negative electrode active material is, for example, particles of a hydrogen storage alloy. When the power storage device 10 is a lithium ion secondary battery, the negative electrode active material is, for example, carbon such as graphite, highly oriented graphite, mesocarbon microbeads, hard carbon, and soft carbon, alkali metals such as lithium and sodium, metal compounds, Examples thereof include metal oxides such as SiO _x (0.5 ≦ x ≦ 1.5), boron-added carbon and the like.

  In the Z-axis direction, the plurality of bipolar electrodes 12 and the plurality of separators 14 may be sandwiched between the electrode 112 and the electrode 212. The electrode 112 and the electrode 212 are electrodes located on the outermost side in the Z-axis direction. The electrode 112 includes a current collector 116 and a positive electrode layer 18 provided on the surface of the current collector 116 on the separator 14 side. The electrode 212 includes a current collector 116 and a negative electrode layer 20 provided on the surface of the current collector 116 on the separator 14 side. The current collector 116 has the same configuration as the current collector 16 except that it is thicker than the current collector 16 in the Z-axis direction.

  The power storage device 10 includes a resin member 28 (first resin member), an insulating case 30 (second resin member), and a resin member 128 (third resin member). The resin member 28 is provided on the outer peripheral portion 161 (see FIG. 3 described later) of the current collector 16. The insulating case 30 is a resin case that supports the plurality of bipolar electrodes 12 via the resin member 28. The resin member 128 connects the resin members 28 of the bipolar electrodes 12 adjacent to each other in the stacking direction of the plurality of bipolar electrodes 12. The material of the resin member 128 may be the same as or different from the material of the resin member 128. The material of the insulating case 30 may be the same as or different from the material of the resin member 28 or the resin member 128. The insulating case 30 is, for example, a case made of polyparaphenylene benzobisoxazole (Zylon (registered trademark)). The insulating case 30 may support the electrode 112 and the electrode 212. The insulating case 30 may be a cylindrical member that can accommodate the plurality of bipolar electrodes 12 and the plurality of separators 14. An electrolytic solution is accommodated in the insulating case 30. Details of the resin member 28, the insulating case 30, and the resin member 128 will be described later with reference to FIGS.

  The power storage device 10 may include a positive electrode plate 40 and a negative electrode plate 50. The positive electrode plate 40 and the negative electrode plate 50 sandwich the plurality of bipolar electrodes 12 and the plurality of separators 14 in the Z-axis direction. The positive electrode plate 40 and the negative electrode plate 50 may sandwich the electrode 112, the electrode 212, and the insulating case 30. The electrode 112 is disposed between the positive electrode plate 40 and the separator 14. The electrode 212 is disposed between the negative electrode plate 50 and the separator 14. A positive electrode terminal 42 is connected to the positive electrode plate 40. A negative electrode terminal 52 is connected to the negative electrode plate 50. The positive and negative terminals 42 and 52 can charge and discharge the power storage device 10.

  The positive electrode plate 40 and the negative electrode plate 50 are provided with through holes for passing through the bolts B extending in the Z-axis direction. The through hole is disposed outside the insulating case 30 when viewed from the Z-axis direction. The bolt B can be inserted from the positive electrode plate 40 toward the negative electrode plate 50 while being insulated from the positive electrode plate 40 and the negative electrode plate 50. A nut N is screwed to the tip of the bolt B. Thereby, the positive electrode plate 40 and the negative electrode plate 50 can restrain the plurality of bipolar electrodes 12, the plurality of separators 14, the electrodes 112, the electrodes 212, and the insulating case 30. As a result, the inside of the insulating case 30 can be sealed.

  FIG. 3 is an enlarged cross-sectional view of the resin member 28, the insulating case 30, and the resin member 128. The resin member 28 is provided on at least a part of the outer peripheral portion 161 of the current collector 16. The resin member 28 may be provided in an annular shape over the entire outer peripheral portion 161. The resin member 28 is provided on at least one of the first surface 16 a and the second surface 16 b of the current collector 16. In the example shown in FIG. 3, the resin member 28 is provided on both the first surface 16 a and the second surface 16 b of the current collector 16. The resin member 28 has a contact surface 28 a that contacts the first surface 16 a of the current collector 16 and a contact surface 28 b that contacts the second surface 16 b of the current collector 16. The resin member 28 may also be provided on the end surface 16c of the current collector 16, and in this case, the resin member 28 also has a contact surface 28c that contacts the end surface 16c of the current collector 16. The end surface 16c is a surface that connects the first surface 16a and the second surface 16b. The contact surface 28c is a surface that connects the contact surface 28a and the contact surface 28b. The resin member 28 has a U-shaped cross section as viewed from the direction orthogonal to the outer peripheral direction of the current collector 16 (Y-axis direction in the portion shown in FIG. 3) so as to cover the outer peripheral portion 161 of the current collector 16. Have.

  The resin member 28 is provided with a through hole 28h that penetrates the resin member 28 in the Z-axis direction. The number of through holes 28h may be one, or two or more. The resin member 128 passes through the through hole 28h.

  Examples of the material of the resin member 28 are polystyrene (PS), polyamide (PA) 66, polycarbonate (PC), polyphenylene sulfide (PPS), polybutylene terephthalate (PBT resin), and the like. By using these materials, the resin member 28 can be provided with insulating properties.

  The insulating case 30 is provided on the resin member 28. The insulating case 30 supports the outer peripheral portion 161 of the current collector 16 through the resin member 28. In the example shown in FIG. 3, the resin member 28 is embedded in the insulating case 30 together with the outer peripheral portion 161 of the current collector 16. The insulating case 30 includes a first portion 301 located between the resin members 28 adjacent in the Z-axis direction, and a second portion 302 that covers the outside of the resin member 28. The first portions 301 and the second portions 302 are alternately arranged in the Z-axis direction.

  The resin member 128 fixes the resin members 28 of the bipolar electrodes 12 adjacent in the Z-axis direction. The resin member 128 extends from the bipolar electrode 12 at one end to the bipolar electrode 12 at the other end in the Z-axis direction. The resin member 128 is, for example, a rod-shaped member. The resin member 128 may be formed by pouring resin into the through hole 28h of the resin member 28, or a pre-molded resin member 128 may be inserted into the through hole 28h.

  FIG. 4 is a cross-sectional view of the power storage device taken along line IV-IV in FIG. As shown in FIG. 4, the resin member 128 may be disposed on each side of the current collector 16 having a rectangular shape, for example, when viewed from the Z-axis direction. In this case, the plurality of resin members 128 are arranged apart from each other. The resin member 128 is disposed, for example, at the center of each side of the current collector 16. The resin member 128 may be disposed at each vertex of the current collector 16 having a rectangular shape, for example.

  As shown in FIG. 4, the resin member 28 is provided with a plurality of through holes 28h, and the resin member 128 passes through each of the plurality of through holes 28h. The resin member 28 has an outer portion 282 located outside the through hole 28h when viewed from the Z-axis direction. The through hole 28h is located between the outer peripheral portion 161 and the outer portion 282 of the current collector 16. Is located. The resin member 28 may not have the outer portion 282. In this case, the through hole 28h is exposed at the end face 28e of the resin member 28. When viewed from the Z-axis direction, the resin member 28 has an inner portion 281 located between the outer peripheral portion 161 of the current collector 16 and the through hole 28h. The resin member 28 may not have the inner portion 281. In this case, the through hole 28 h comes into contact with the outer peripheral portion 161 of the current collector 16.

  Alternatively, as shown in FIGS. 5 and 6, a resin member 128 may be provided on the end surface 28 e of the resin member 28 when viewed from the Z-axis direction. In the example shown in FIG. 5, the resin member 128 is disposed in a cut portion 28 g provided on the end surface 28 e of the resin member 28. The cut portion 28g penetrates the resin member 28 in the Z-axis direction. In this case, the resin member 128 can be formed, for example, by pouring resin into the cut portion 28g in a state where a flat plate is pressed against the end surface 28e of the resin member 28. In the example shown in FIG. 6, the resin member 128 is disposed on the flat end surface 28 e of the resin member 28. In this case, for example, the resin member 128 is welded to the end face 28e.

  In the power storage device 10 described above, the resin members 28 of the bipolar electrodes 12 adjacent in the Z-axis direction are connected by the resin member 128. Therefore, for example, when the insulating case 30 is formed by injection molding (insert molding), for example, even if a pressure in the lateral direction (in the XY plane) is applied to the bipolar electrode 12 by the fluid of the material of the insulating case 30, for example, The positional deviation between the matching bipolar electrodes 12 can be suppressed. When the number of stacked bipolar electrodes 12 is increased or the thickness of the bipolar electrode 12 is decreased, the positional deviation between the adjacent bipolar electrodes tends to be large. However, even in such a case, the power storage device 10 can suppress misalignment between adjacent bipolar electrodes 12. By suppressing misalignment between the adjacent bipolar electrodes, short circuit due to contact between the adjacent bipolar electrodes, poor dimension of the bipolar electrode, misalignment of the internal space in the insulating case 30, and the like are suppressed.

  When the resin member 28 is provided with a through hole 28h, and the resin member 128 passes through the through hole 28h, in a direction orthogonal to the Z-axis direction (for example, a direction in the XY plane), the resin members 28 are adjacent to each other. Is suppressed. If the resin member 28 is provided with a plurality of through holes 28h and the resin member 128 passes through each through hole 28h, the effect of suppressing the displacement is greater than in the case where there is one through hole 28h.

  The resin member 28 has an outer portion 282 positioned outside the through hole 28h when viewed from the Z-axis direction, and the through hole 28h is between the outer peripheral portion 161 and the outer portion 282 of the current collector 16. If it is located, it can suppress that the resin member 128 moves to the outer side of the through-hole 28h.

  When the resin member 28 has an inner portion 281 positioned between the outer peripheral portion 161 of the current collector 16 and the through hole 28h when viewed from the Z-axis direction, the resin member 128 is located inside the through hole 28h. It can suppress moving. Therefore, deformation of the outer peripheral portion 161 of the current collector 16 by the resin member 128 can be suppressed.

  As shown in FIG. 4 to FIG. 6, when the resin member 128 is disposed on each side of the current collector 16 having a rectangular shape when viewed from the Z-axis direction, the resin member 128 of the current collector 16 is Compared with the case where it arrange | positions at each vertex, the effect which suppresses the position shift between the adjacent bipolar electrodes 12 is large. This is because, generally, the pressure applied to the bipolar electrode 12 is larger at each side than the apexes of the current collector 16, and the amount of displacement is larger.

  In the example described above, the first resin members (resin members 28) adjacent to each other are provided apart via the insulating case 30, but are provided so that the first resin members are in contact with each other. Also good. FIG. 7 is an enlarged cross-sectional view of the first resin member (resin member 29), the second resin member (insulating case 31), and the third resin member (resin member 129) according to such a modification. In the example shown in FIG. 7, the resin members 29 of the bipolar electrodes 12 adjacent in the Z-axis direction are in contact with each other. Specifically, the resin member 29 has a contact surface 29 c on the side opposite to the contact surface 29 a that contacts the first surface 16 a of the current collector 16, and contacts the second surface 16 b of the current collector 16. A contact surface 29d is provided on the side opposite to the contact surface 29b. The contact surface 29c of the resin member 29 is in contact with the contact surface 29d of the resin member 29 below (in the negative Z-axis direction). The contact surface 29d of the resin member 29 is in contact with the upper contact surface 29c of the resin member 29 (Z-axis positive direction). The separator 14 is located inside the resin member 29 when viewed from the Z-axis direction. In the example shown in FIG. 7, the contact surface 29 c of the resin member 29 is located in the center of the separator 14 below the current collector 16 provided with the resin member 29 in the Z-axis direction. The contact surface 29 d of the resin member 29 is located at the center of the separator 14 above the current collector 16 provided with the resin member 29. The insulating case 31 is shaped to match the shape of the resin member 29, and does not have a portion located between the resin members 29 adjacent in the Z-axis direction as compared to the insulating case 30 (FIG. 3). Is different.

  The resin member 29 is provided with a through hole 29h that penetrates the resin member 29 in the Z-axis direction. The number of through holes 29h may be one or two or more. The resin member 129 passes through the through hole 29h.

  The thickness of the resin member 29 is larger than any of the thickness of the positive electrode layer 18 and the thickness of the negative electrode layer 20. In the case where the resin member 29 is provided on both the first surface 16 a and the second surface 16 b of the current collector 16, the resin member 29 is provided on the first surface 16 a of the current collector 16. The thickness of the provided portion (the length in the Z-axis direction) is larger than the thickness of the negative electrode layer 20. Further, the thickness of the portion of the resin member 29 provided on the second surface 16 b of the current collector 16 is larger than the thickness of the positive electrode layer 18.

  As described above, the thickness of the resin member 29 may be larger than any of the thickness of the positive electrode layer 18 and the thickness of the negative electrode layer 20. Thereby, the space | interval of the positive electrode layer 18 and the negative electrode layer 20 which were provided in the electrical power collector 16 of the bipolar electrode 12 adjacent in the lamination direction (Z-axis direction) of the some bipolar electrode 12 is securable.

  The resin members 29 of the bipolar electrodes 12 adjacent in the Z-axis direction may be in contact with each other. Thereby, the distance between the current collectors 16 can be determined using the thickness of the resin member 29.

  The resin member 129 fixes the resin members 29 of the bipolar electrodes 12 adjacent in the Z-axis direction. The resin member 129 extends from the bipolar electrode 12 at one end to the bipolar electrode 12 at the other end in the Z-axis direction. The resin member 129 can be formed by the same method as the resin member 128. The resin member 129 may be arranged at a position similar to the position of the resin member 128 shown in FIGS. An example of the material of the resin member 129 is the same as the example of the material of the resin member 128.

  The resin member 29 has an outer portion 292 positioned outside the through hole 29h when viewed from the Z-axis direction. The through hole 29h is located between the outer peripheral portion 161 of the current collector 16 and the outer portion 292. Is located. The resin member 29 may not have the outer portion 292. In this case, the through hole 29h is exposed at the end face 29e located outside the resin member 29 when viewed from the Z-axis direction. When viewed from the Z-axis direction, the resin member 29 has an inner portion 291 located between the outer peripheral portion 161 of the current collector 16 and the through hole 29h. The resin member 29 may not have the inner portion 291. In this case, the through hole 29 h comes into contact with the outer peripheral portion 161 of the current collector 16.

  Next, an example of a method for manufacturing the power storage device 10 will be described with reference to FIGS. 8-10 is sectional drawing which shows 1 process of the manufacturing method of the electrical storage apparatus which concerns on embodiment. Here, a case where the first resin member, the second resin member, and the third resin member are the resin member 29, the insulating case 31, and the resin member 129 shown in FIG. 7 described above will be described.

(Preparation process)
First, as shown in FIG. 8, a plurality of bipolar electrodes 12 and a plurality of separators 14 are prepared. Each of the plurality of bipolar electrodes 12 includes a current collector 16, a positive electrode layer 18, and a negative electrode layer 20.

(Step of providing the first resin member)
Next, as shown in FIG. 8, the resin member 29 is provided on the outer peripheral portion 161 (see FIG. 7) of the current collector 16. The resin member 29 may be provided on both the first surface 16 a and the second surface 16 b of the current collector 16 over the entire outer peripheral portion 161. For example, the resin member 29 is formed by injection molding so that the resin member 29 covers the outer peripheral portion 161 of the current collector 16. Thereby, the current collector 16 and the resin member 29 are welded.

  Thereafter, a through hole 29 h is formed in the resin member 29. The through hole 29h may be formed, for example, by making a through hole in a molded resin member, or may be formed when the resin member 29 is molded. The through hole 29h may be formed after a laminating process described later.

(Lamination process)
Next, as shown in FIG. 9, a plurality of bipolar electrodes 12 are stacked in series via a separator 14. In this lamination step, the resin members 29 of the bipolar electrodes 12 adjacent in the lamination direction of the plurality of bipolar electrodes 12 are in contact with each other. The separator 14 is provided so as to be positioned inside the resin member 29 when viewed from the stacking direction (Z-axis direction) of the plurality of bipolar electrodes 12. In the lamination step, the adjacent bipolar electrodes 12 can be positioned using the through holes 29h.

(Step of providing a third resin member)
Next, as shown in FIG. 9, the resin members 29 of the bipolar electrodes 12 adjacent in the stacking direction of the plurality of bipolar electrodes 12 are connected by a resin member 129. The resin member 129 may be formed, for example, by pouring resin into the through hole 29h of the resin member 29, or a pre-molded resin member 129 may be inserted into the through hole 29h. Thereby, the adjacent bipolar electrodes 12 are fixed.

(Step of providing the second resin member)
Next, as shown in FIG. 10, the insulating case 31 is provided on the resin members 29 connected to each other by the resin member 129. For example, the insulating case 31 is formed by injection molding using a mold M. First, a plurality of bipolar electrodes 12 connected to each other by the resin member 129 are arranged in the mold M. Thereafter, the material fluid of the insulating case 31 is supplied into the mold M, and the material is solidified. Thereby, the resin member 29 and the resin member 129 and the insulating case 31 are welded. The insulating case 31 supports the outer peripheral portion of the current collector 16 through the resin member 29.

  Thereafter, as described above with reference to FIG. 1, the plurality of bipolar electrodes 12, the plurality of separators 14, the electrodes 112, the electrodes 212, and the insulating case 31 are sandwiched between the positive electrode plate 40 and the negative electrode plate 50. Further, a binding force is applied to the positive electrode plate 40 and the negative electrode plate 50 using the bolt B and the nut N. Thereby, the electrical storage apparatus 10 is manufactured.

  In addition, when the first resin member, the second resin member, and the third resin member are the resin member 28, the insulating case 30, and the resin member 128 shown in FIG. The device 10 can be manufactured.

  According to the method for manufacturing the power storage device described above, after providing the resin member 29 on at least one of the first surface 16 a and the second surface 16 b in at least a part of the outer peripheral portion 161 of the current collector 16. A plurality of bipolar electrodes 12 are stacked. Thereby, when laminating | stacking the some bipolar electrode 12, the resin member 29 provided in the collector 16 of each bipolar electrode 12 can also be utilized for relative positioning of collectors.

  In addition, the resin members 29 of the bipolar electrodes 12 adjacent in the stacking direction of the plurality of bipolar electrodes 12 are connected by the resin member 129. Therefore, for example, when forming the insulating case 31 by injection molding, even if a lateral pressure is applied to the bipolar electrode 12 by the fluid of the material of the insulating case 31, for example, it is possible to suppress the positional deviation between the adjacent bipolar electrodes 12. .

  In the step of providing the resin member 29 (first resin member), the resin member 29 may be provided on both the first surface 16a and the second surface 16b. In the stacking step, a plurality of bipolar electrodes 12 are stacked via the separators 14, and the resin members 29 of the bipolar electrodes 12 adjacent in the stacking direction of the plurality of bipolar electrodes 12 are in contact with each other. The separator 14 may be located inside the resin member 29 when viewed from the stacking direction. In this case, since the resin members 29 of the bipolar electrodes 12 adjacent in the stacking direction are in contact with each other, the distance between the current collectors 16 can be determined using the thickness of the resin member 29. Further, since the separator 14 is positioned inside the resin member 29 when viewed from the stacking direction, the separator 14 can be positioned using the resin member 29.

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

  For example, when viewed from the stacking direction of the plurality of bipolar electrodes 12, the current collector 16 may have a shape such as a polygon or a circle.

  The resin member 128 or the resin member 129 may be disposed so as to surround the entire periphery of the outer peripheral portion 161 of the current collector 16 when viewed from the stacking direction of the plurality of bipolar electrodes 12. In this case, the resin member 128 or the resin member 129 is a cylindrical member. Alternatively, the resin member 128 or the resin member 129 may be disposed on at least a part of the outer peripheral portion 161 of the current collector 16 when viewed from the stacking direction of the plurality of bipolar electrodes 12.

  Further, the cross-sectional shape perpendicular to the Z-axis direction of the resin member 128 or the resin member 129 may be circular as shown in FIG. 4, for example, or one side of the rectangular shape is curved as shown in FIG. For example, as shown in FIG. 6, it may be a rectangular shape.

  DESCRIPTION OF SYMBOLS 10 ... Power storage device, 12 ... Bipolar electrode, 14 ... Separator, 16 ... Current collector, 16a ... First surface, 16b ... Second surface, 18 ... Positive electrode layer, 20 ... Negative electrode layer, 28, 29 ... Resin member (First resin member), 28e ... end face, 28h, 29h ... through hole, 30, 31 ... insulating case (second resin member), 128, 129 ... resin member (third resin member), 161 ... outer periphery Part, 281, 291 ... inner part, 282, 292 ... outer part.

Claims (7)

A plurality of stacked bipolar electrodes, each of the plurality of bipolar electrodes having a first surface and a second surface opposite to the first surface; and the first surface A plurality of bipolar electrodes having a positive electrode layer provided on the second surface and a negative electrode layer provided on the second surface;
A first resin member provided on at least one of the first surface and the second surface in at least a part of the outer peripheral portion of the current collector;
A second resin member provided on the first resin member and supporting the outer peripheral portion of the current collector via the first resin member;
A third resin member for connecting the first resin members of each of the bipolar electrodes adjacent in the stacking direction of the plurality of bipolar electrodes;
A power storage device. The first resin member is provided with a through hole penetrating the first resin member in the stacking direction of the plurality of bipolar electrodes.
The power storage device according to claim 1, wherein the third resin member passes through the through hole. The first resin member is provided with a plurality of the through holes,
The power storage device according to claim 2, wherein the third resin member passes through each of the plurality of through holes.   The first resin member has an outer portion located outside the through hole when viewed from the stacking direction of the plurality of bipolar electrodes, and the through hole is the outer peripheral portion of the current collector. The power storage device according to claim 2, wherein the power storage device is located between the outer portion and the outer portion.   The first resin member has an inner portion located between the outer peripheral portion of the current collector and the through hole when viewed from the stacking direction of the plurality of bipolar electrodes. 5. The power storage device according to claim 4.   2. The power storage device according to claim 1, wherein the third resin member is provided on an end surface of the first resin member when viewed from the stacking direction of the plurality of bipolar electrodes.   The third resin member according to any one of claims 1 to 6, wherein the third resin member is disposed on each side of the current collector having a rectangular shape when viewed from the stacking direction of the plurality of bipolar electrodes. Power storage device.

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