JP2019012653A - Power storage device and manufacturing method for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power storage device in which defective molding of a frame body of a power storage module is suppressed while maintaining sufficient heat dissipation performance, and a manufacturing method thereof. According to the power storage device including the power storage module and the method for manufacturing the same, since the protruding portion of the overhang portion has a thickness H1 larger than the thickness h1 of the base portion when the second resin portion 54 is molded. The resin is more likely to flow into the void portion 61 of the die corresponding to the protruding portion than the void portion 63 of the die corresponding to the base portion. The resin that has flowed into the void portion 61 can flow into the void portion 63. Therefore, even if the thickness h1 of the base portion is reduced for heat dissipation of the conductive plate and the void portion 63 becomes narrow, the void portion 63 can be sufficiently filled with the resin. Therefore, the power storage device in which a defective molding of the frame body is suppressed by the protrusions provided in parallel on the base while maintaining sufficient heat dissipation performance by the base. [Selection diagram] Fig. 6

Description

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

  A power storage module (bipolar battery) is known in which 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 laminated in one direction via a separator that holds an electrolyte. And the electrical storage apparatus (battery unit) which electrically connected such an electrical storage module is disclosed. For example, Patent Document 1 discloses a power storage device having a heat dissipation structure in which a plurality of power storage modules are electrically connected in parallel and a conductor is interposed between adjacent power storage modules.

JP 2009-117105 A

  About the conductor interposed between adjacent electrical storage modules, heat dissipation can be accelerated | stimulated by using refrigerant | coolants, such as air. From the viewpoint of securing a wide refrigerant flow path, it is conceivable to increase the separation distance between adjacent power storage modules by reducing the height of the power storage modules (that is, the length in the stacking direction).

  However, in the case where the power storage module has a configuration in which a plurality of bipolar electrodes are stacked via separators and a resin frame provided around the stack as viewed from the stacking direction, As the height of the body is reduced, a narrow portion is generated, resulting in a defective molding of the frame.

  An object of the present invention is to provide a power storage device and a method of manufacturing the power storage device in which defective molding of the frame of the power storage module is suppressed while maintaining sufficient heat dissipation performance.

  In a power storage device according to one aspect of the present invention, a plurality of bipolar electrodes each having a positive electrode layer provided on one surface of an electrode plate and a negative electrode layer provided on the other surface of the electrode plate are stacked in a first direction via a separator. A laminated body, a plurality of first resin portions for holding the edge portions of each electrode plate of the plurality of bipolar electrodes, and a cylindrical second provided around the plurality of first resin portions as viewed from the first direction. A plurality of power storage modules arranged in the first direction and disposed between adjacent power storage modules in the first direction, and each stacked body of adjacent power storage modules. An overhang portion that covers the edge of the first resin portion that is located on the outermost side in the first direction among the plurality of first resin portions from the first direction. Having an overhang portion in the first direction A first portion having a first thickness and a second portion having a second thickness greater than the first thickness and protruding in the first direction, the first portion and the second portion, Are aligned along the edge of the first resin portion.

  In the above power storage device, when the second resin portion is molded, the second portion of the overhang portion has a second thickness that is thicker than the first thickness of the first portion, and thus a mold corresponding to the first portion. The resin tends to flow into the void portion of the mold corresponding to the second portion rather than the void portion. The resin that has flowed into the void portion of the mold corresponding to the second portion can flow into the void portion of the mold corresponding to the first portion along the edge of the first resin portion. Therefore, even if the first thickness of the first portion of the overhang portion is reduced in order to promote heat dissipation of the conductor, and the gap portion of the mold corresponding to the first portion is narrowed, The resin can be sufficiently filled in the void portion of the mold corresponding to one portion. Therefore, in the above power storage device, the molding failure of the frame body is suppressed by the second portion arranged in parallel with the first portion while maintaining sufficient heat dissipation performance by the first portion of the overhang portion.

  In the power storage device according to another aspect of the present invention, the overhang portion includes a first overhang portion that covers an edge portion of the first resin portion located on the outermost side on one side, and a first resin located on the outermost side on the other side. A second overhang portion covering the edge of each portion, each of the first overhang portion and the second overhang portion having a first portion and a second portion, and the first portion and the second portion being the first It is lined up along the edge of the resin part. In this case, in both the first overhang portion and the second overhang portion of the second resin portion, the frame portion is poorly molded by the second portion arranged in parallel with the first portion while maintaining sufficient heat dissipation performance by the first portion. Is suppressed.

  In the power storage device according to another aspect of the present invention, the second portion of the first overhang portion and the second portion of the second overhang portion protrude alternately along the edge of the first resin portion. In this case, a plurality of power storage modules can be arranged so that the second portions of the second resin portions of the power storage modules adjacent in the first direction do not contact each other.

  In the power storage device according to another aspect of the present invention, in the frame of the power storage module adjacent in the first direction, the second portion of the overhang portion protrudes from one frame toward the other frame, and A second portion of the overhang portion projects from the other frame toward the one frame. In this case, in the frame body of the adjacent power storage module, the molding failure of the frame body is suppressed by the second portion arranged in parallel with the first portion while maintaining sufficient heat dissipation performance by the first portion.

  The power storage device according to another aspect of the present invention includes a second portion of an overhang portion projecting from one frame body toward the other frame body, and an overhang portion projecting from the other frame body toward the one frame body And a second portion of which defines a vent. In this case, a refrigerant such as air can be sent to the conductor interposed between the adjacent power storage modules through the vent hole.

  In the power storage device according to another aspect of the present invention, the conductor has a through hole extending along a direction orthogonal to the first direction, and the vent hole and the through hole of the conductor communicate with each other. In this case, heat dissipation by the conductor is further promoted.

  In a method for manufacturing a power storage device according to one aspect of the present invention, a plurality of bipolar electrodes each having a positive electrode layer provided on one surface of an electrode plate and a negative electrode layer provided on the other surface of the electrode plate are arranged in a first direction via a separator. , A plurality of first resin portions that hold the edge portions of the electrode plates of the plurality of bipolar electrodes, and a cylindrical shape that is provided around the plurality of first resin portions as viewed from the first direction. Each of the plurality of power storage modules arranged in the first direction and between the adjacent power storage modules disposed in the first direction. A power storage device manufacturing method for manufacturing a power storage device comprising a conductor in contact with a body, wherein an electrode laminate in which a plurality of bipolar electrodes provided with a first resin portion are stacked is housed in a cavity of a mold, Electrode product viewed from the first direction A first air gap is formed around the body, and an overhang portion is formed that covers the edge of the first resin portion located in the outermost position in the first direction among the plurality of first resin portions from the first direction. A step of forming a second void, and a step of injecting a resin to be the second resin portion into the cavity of the mold and filling the first void and the second void with the resin to be the second resin portion. And a step of curing the resin to be the second resin portion to form the second resin portion, wherein the second gap is an overhang portion having a first thickness as a thickness in the first direction. A first gap portion corresponding to the first portion, and a second gap portion having a second thickness larger than the first thickness and corresponding to the second portion of the overhang portion protruding in the first direction. Including the first gap portion and the second gap portion along the edge of the first resin portion. Sort Te, in the step of filling the second gap in the resin to the second resin portion, the resin to be the second resin portion flows toward the first air gap portion from the second air gap portion.

  In the method for manufacturing the power storage device, when the second resin portion is molded, the second portion of the overhang portion has a second thickness that is greater than the first thickness of the first portion, and thus corresponds to the first portion. The resin tends to flow into the second gap portion of the mold corresponding to the second portion rather than the first gap portion of the mold. The resin that has flowed into the second gap portion can flow into the first gap portion along the edge of the first resin portion. Therefore, even if the first thickness of the first portion of the overhang portion is reduced in order to promote heat dissipation of the conductor and the first gap portion is narrowed, the first gap portion is sufficient. Can be filled with resin. Therefore, according to the method of manufacturing the power storage device, the power storage device in which the molding failure of the frame body is suppressed by the second portion arranged in parallel to the first portion while maintaining sufficient heat dissipation performance by the first portion of the overhang portion. Is obtained.

  ADVANTAGE OF THE INVENTION According to this invention, the electrical storage apparatus with which the shaping | molding defect of the frame of an electrical storage module was suppressed, and its manufacturing method are provided, maintaining sufficient heat dissipation performance.

It is a schematic sectional drawing which shows one Embodiment of an electrical storage apparatus provided with an electrical storage module. It is a schematic sectional drawing which shows the electrical storage module which comprises the electrical storage apparatus of FIG. It is a schematic perspective view which shows the electrical storage module of FIG. It is a side view of the electrical storage module of FIG. It is a schematic perspective view which shows the manufacturing apparatus which manufactures the electrical storage module of FIG. It is the figure which showed the space | gap of the metal mold | die in the manufacturing apparatus of FIG. It is the flowchart which showed the procedure which manufactures the electrical storage module of FIG. It is a side view which shows the state which the electrical storage module of FIG. 2 overlapped. It is the figure which showed the 2nd part of the overhang part of a different aspect.

  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.

  FIG. 1 is a schematic cross-sectional view illustrating an embodiment of a power storage device including a power storage module. The power storage device 10 shown in the figure is used as a battery for various vehicles such as forklifts, hybrid vehicles, and electric vehicles. The power storage device 10 includes a plurality (three in the present embodiment) of power storage modules 12, but may include a single power storage module 12. The power storage module 12 is, for example, a bipolar battery. The power storage module 12 is a secondary battery such as a nickel hydride secondary battery or a lithium ion secondary battery, but may be an electric double layer capacitor. In the following description, a nickel metal hydride secondary battery is illustrated.

  The plurality of power storage modules 12 can be stacked via a conductive plate (conductor) 14 such as a metal plate, for example. When viewed from the stacking direction (Z direction, first direction), the power storage module 12 and the conductive plate 14 have, for example, a rectangular shape. 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 of the power storage modules 12. The conductive plate 14 is electrically connected to the adjacent power storage module 12. Thereby, the some electrical storage module 12 is connected in series in the lamination direction. In the stacking direction, a positive electrode terminal 24 is connected to the conductive plate 14 located at one end, and a negative electrode terminal 26 is connected to the conductive plate 14 located at the other end. The positive terminal 24 may be integrated with the conductive plate 14 to be connected. The negative electrode terminal 26 may be integrated with the conductive plate 14 to be connected. The positive electrode terminal 24 and the negative electrode terminal 26 extend in a direction (X direction) intersecting the stacking direction. The positive and negative terminals 24 and 26 can charge and discharge the power storage device 10.

  The conductive plate 14 can also function as a heat radiating plate for releasing heat generated in the power storage module 12. Specifically, the conductive plate 14 has higher thermal conductivity than the contact surface of the power storage module 12 with the conductive plate 14. The conductive plate 14 can be formed of a metal material such as aluminum or copper, for example. Inside the conductive plate 14, a plurality of through holes 14 a extending in a direction (Y direction) orthogonal to the stacking direction is provided. The through hole 14a communicates from one side surface facing each other in the conductive plate 14 to the other side surface. The through holes 14a are arranged in a direction intersecting the stacking direction and the Y direction (X direction). When a gaseous refrigerant such as air passes through such a through hole 14a, heat generated in the power storage module 12 can be efficiently released to the outside. The size of the conductive plate 14, the material of the conductive plate 14, the size of the through holes 14a, the number of the through holes 14a, and the like are appropriately adjusted so that the temperature of the power storage device 10 does not exceed 50 ° C., for example. The power storage module 12 may be provided with a device that actively circulates (circulates) air through the through hole 14a. When viewed from the stacking direction, the conductive plate 14 is smaller than the power storage module 12, but may be the same as or larger than the power storage module 12. In other words, the conductive plate 14 is disposed in a region where the power storage module 12 is disposed when viewed from the stacking direction.

  The power storage device 10 may include a restraining member 16 that restrains the alternately stacked power storage modules 12 and conductive plates 14 in the stacking direction. The restraining member 16 includes a pair of restraining plates 16A and 16B and a connecting member (bolt 18 and nut 20) for joining the restraining plates 16A and 16B to each other. An insulating film 22 such as a resin film is disposed between the restraining plates 16A and 16B and the conductive plate. Each restraint plate 16A, 16B is comprised, for example with metals, such as iron. When viewed from the stacking direction, each of the restraining plates 16A and 16B and the insulating film 22 has, for example, a rectangular shape. The insulating film 22 is larger than the conductive plate 14, and the restraining plates 16 </ b> A and 16 </ b> B are larger than the power storage module 12. When viewed from the stacking direction, an insertion hole 16A1 through which the shaft portion of the bolt 18 is inserted is provided at a position on the outer side of the power storage module 12 at the edge portion of the restraint plate 16A. Similarly, an insertion hole 16 </ b> B <b> 1 through which the shaft part of the bolt 18 is inserted is provided at a position on the outer side of the power storage module 12 at the edge of the restraint plate 16 </ b> B when viewed from the stacking direction. When each restraint plate 16A, 16B has a rectangular shape when viewed from the stacking direction, the insertion hole 16A1 and the insertion hole 16B1 are located at the corners of the restraint plates 16A, 16B.

  One constraining plate 16A is abutted against the conductive plate 14 connected to the negative terminal 26 via the insulating film 22, and the other constraining plate 16B has the insulating film 22 applied to the conductive plate 14 connected to the positive terminal 24. Has been hit through. For example, the bolt 18 is passed through the insertion hole 16A1 from one restraint plate 16A side toward the other restraint plate 16B side, and a nut 20 is screwed onto the tip of the bolt 18 protruding from the other restraint plate 16B. Yes. Accordingly, 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.

  2 is a schematic cross-sectional view showing a power storage module constituting the power storage device of FIG. The power storage module 12 shown in the figure includes a stacked body 30 in which a plurality of bipolar electrodes 32 are stacked. The laminated body 30 has, for example, a rectangular shape when viewed from the lamination direction of the bipolar electrode 32. A separator 40 may be disposed between the adjacent bipolar electrodes 32. The bipolar electrode 32 includes an electrode plate 34, a positive electrode (positive electrode layer) 36 provided on one surface of the electrode plate 34, and a negative electrode (negative electrode layer) 38 provided on the other surface of the electrode plate 34. In the stacked body 30, the positive electrode 36 of one bipolar electrode 32 faces the negative electrode 38 of one bipolar electrode 32 adjacent in the stacking direction across the separator 40, and the negative electrode 38 of one bipolar electrode 32 connects the separator 40. It faces the positive electrode 36 of the other bipolar electrode 32 that is adjacent in the stacking direction. In the laminating direction, an electrode plate 34 (negative electrode termination electrode) having a negative electrode 38 disposed on the inner surface is disposed at one end of the laminate 30 and a positive electrode 36 is disposed on the inner surface at the other end. 34 (positive terminal electrode) is disposed. The negative electrode 38 of the negative electrode-side termination electrode faces the positive electrode 36 of the uppermost bipolar electrode 32 with the separator 40 interposed therebetween. The positive electrode 36 of the positive terminal electrode is opposed to the negative electrode 38 of the lowermost bipolar electrode 32 with the separator 40 interposed therebetween. The electrode plates 34 of these termination electrodes are connected to the adjacent conductive plates 14 (see FIG. 1).

  The power storage module 12 includes a frame body 50 that holds the edge portion 34 a of the electrode plate 34 on the side surface 30 a of the stacked body 30 that extends in the stacking direction of the bipolar electrodes 32. The frame body 50 is configured to surround the side surface 30 a of the stacked body 30. The side surface 50 s has, for example, a rectangular shape when viewed from the lamination direction of the bipolar electrode 32. In this case, the side surface 50s is composed of four rectangular surfaces. The frame 50 can include a first resin portion 52 that holds the edge portion 34a of the electrode plate 34 and a second resin portion 54 that is provided around the first resin portion 52 when viewed from the stacking direction.

  The first resin portion 52 constituting the inner wall of the frame 50 is provided from one surface (surface on which the positive electrode 36 is formed) of the electrode plate 34 of each bipolar electrode 32 to the end surface of the electrode plate 34 at the edge portion 34a. . When viewed from the stacking direction of the bipolar electrodes 32, each first resin portion 52 is provided over the entire circumference of the edge portion 34 a of the electrode plate 34 of each bipolar electrode 32. Adjacent first resin portions 52 are welded to each other on the surface extending outside the other surface (surface on which the negative electrode 38 is formed) of the electrode plate 34 of each bipolar electrode 32. As a result, the edge portion 34 a of the electrode plate 34 of each bipolar electrode 32 is buried and held in the first resin portion 52. Similarly to the edge portion 34 a of the electrode plate 34 of each bipolar electrode 32, the edge portions 34 a of the electrode plates 34 disposed at both ends of the laminated body 30 are also held in a state of being buried in the first resin portion 52. Thus, an internal space V that is airtightly partitioned by the electrode plates 34 and 34 and the first resin portion 52 is formed between the electrode plates 34 and 34 adjacent in the stacking direction. In the internal space V, for example, an electrolytic solution (not shown) made of an alkaline solution such as an aqueous potassium hydroxide solution is accommodated. In the following description, the stacked body 30 in which each bipolar electrode 32 is provided with the first resin portion 52 is also referred to as an electrode stacked body 58.

  The second resin portion 54 constituting the outer wall of the frame body 50 is a rectangular cylindrical portion extending over the entire length of the multilayer body 30 in the lamination direction of the bipolar electrode 32. The second resin portion 54 covers the outer surface of the first resin portion 52 extending in the stacking direction of the bipolar electrode 32. The second resin portion 54 is welded to the outer surface of the first resin portion 52 on the inner surface that extends in the stacking direction of the bipolar electrode 32. In addition, the second resin portion 54 is an edge portion of the first resin portion 52 located on the outermost side in the stacking direction among the plurality of first resin portions 52 provided over the end surface of the electrode plate 34 constituting the stacked body 30. Has an overhang portion 55 that covers from the stacking direction. As shown in FIG. 2, the overhang portion 55 includes a first overhang portion 55a that covers the edge of the first resin portion 52 located on the outermost side on one side (the upper side in FIG. 2) and the other side (the lower side in FIG. 2). A second overhang portion 55b covering the edge of the first resin portion 52 located on the outermost side.

  The electrode plate 34 is a rectangular metal foil made of nickel, for example. The edge 34 a 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 buried in the first resin portion 52 constituting the inner wall of the frame body 50. It is an area to be held. An example of the positive electrode active material constituting the positive electrode 36 is nickel hydroxide. Examples of the negative electrode active material constituting the negative electrode 38 include a hydrogen storage alloy. The formation region of the negative electrode 38 on the other surface of the electrode plate 34 is slightly larger than the formation region of the positive electrode 36 on one surface of the electrode plate 34.

  The separator 40 is formed in a sheet shape, for example. Examples of the material forming the separator 40 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 40 may be reinforced with a vinylidene fluoride resin compound. The separator 40 is not limited to a sheet shape, and may be a bag shape.

  The frame 50 (the first resin portion 52 and the second resin portion 54) is formed in a rectangular cylindrical shape by, for example, injection molding using an insulating resin. Examples of the resin material constituting the frame 50 include polypropylene (PP), polyphenylene sulfide (PPS), and modified polyphenylene ether (modified PPE).

  FIG. 3 is a schematic perspective view showing the power storage module of FIG. FIG. 4 is a side view of the power storage module of FIG.

  The second resin portion 54 of the frame 50 surrounds the periphery of the electrode laminate 58 (that is, the laminate 30 in which the first resin portion 52 is provided on each bipolar electrode 32). The overhang portion 55 of the second resin portion 54 covers the entire circumference of the edge portion of the first resin portion 52 of the electrode laminate 58. The second resin portion 54 has a rectangular cylindrical shape, and includes a pair of side wall portions 54A and 54B that face each other in the Y direction and a pair of side wall portions 54C and 54D that face each other in the X direction. Protruding portions 60 projecting in the Z direction are provided on the overhang portions 55 in the pair of side wall portions 54A and 54B. In addition, the protrusion part 60 is not provided in the overhang part 55 in a pair of side wall part 54C, 54D. The pair of side wall portions 54 </ b> C and 54 </ b> D may be provided with a liquid injection port (not shown) for injecting the electrolytic solution into the frame body 50.

  Here, the overhang part 55 in the side wall part 54A of the second resin part 54 will be described with reference to FIG.

  The overhang portion 55 in the side wall portion 54 </ b> A includes a first overhang portion 55 a located above the electrode laminate 58 and a second overhang portion 55 b located below the electrode laminate 58.

  The first overhang portion 55a includes a projecting portion 60 (second portion) having a thickness H1 in the Z direction and a base portion 62 (first portion) having a thickness h1 in the Z direction. Specifically, the protrusions 60 and the base portions 62 are alternately arranged along the edge of the first resin portion 52 (that is, along the X direction). The protruding portion 60 is a rectangular portion protruding in the Z direction with respect to the base portion 62, and the thickness H1 thereof is larger than the thickness h1 of the base portion (H1> h1).

  The second overhang portion 55b includes a protrusion 60 (second portion) having a thickness H2 in the Z direction and a base portion 62 (first portion) having a thickness h2 in the Z direction. Also in the second overhang portion 55b, the protruding portions 60 and the base portions 62 are alternately arranged along the edge of the first resin portion 52 (that is, along the X direction). Similarly to the protrusion 60 of the first overhang 55a, the protrusion 60 of the second overhang 55b is a rectangular portion that protrudes in the Z direction with respect to the base 62, and its thickness H2 is the thickness h2 of the base. Greater than (H2> h2). The protrusions 60 of the first overhang part 55a and the protrusions 60 of the second overhang part 55b are alternately protruded along the edge of the first resin part 52 (that is, along the X direction) (so-called Staggered).

  In the present embodiment, the protruding portion 60 of the first overhang portion 55a and the protruding portion 60 of the second overhang portion 55b have the same shape and dimensions, and their thicknesses are equal (H1 = H2). Further, the thickness h1 of the base portion 62 of the first overhang portion 55a is equal to the thickness h2 of the base portion 62 of the second overhang portion 55b (h1 = h2).

  In addition, although description is abbreviate | omitted, the shape of the overhang part of the side wall part 54B of the 2nd resin part 54 is the same as that of the overhang part of 54 A of side wall parts mentioned above.

  FIG. 5 is a schematic perspective view showing a manufacturing apparatus for manufacturing the above-described power storage module 12.

  Specifically, the manufacturing apparatus 100 shown in FIG. 5 is a vertical injection molding machine that forms the second resin portion 54 of the frame 50 by insert molding, and includes a mold 130 including a lower mold 110 and an upper mold 120. And an injector 140 for injecting the resin 54a into the mold 130.

  The lower mold 110 extends in the horizontal direction and has a rectangular cavity 112 that is recessed in the vertical direction. Inside the cavity 112, an electrode laminate 58 is disposed as an insert. At this time, the electrode laminate 58 is arranged such that the lamination direction (that is, the lamination direction of the laminate 30) is substantially parallel to the vertical direction. The cavity 112 is designed to have such a size that a rectangular annular gap G having a uniform width is formed around the electrode laminate 58 when the electrode laminate 58 is disposed. Further, the depth of the cavity 112 is set so that the overhang portion 55 of the second resin portion 54 that covers the peripheral portion of the electrode laminate 58 from the lamination direction is formed as shown in FIG. It is designed deeper by a predetermined length.

  The upper mold 120 extends in the horizontal direction so as to face the lower mold 110, and covers the cavity 112 of the lower mold 110 when superimposed on the lower mold 110. Four gates 122 for injecting the resin 54 a injected from the injector 140 into the cavity 112 are provided on the facing surface 120 a of the upper mold 120 that faces the lower mold 110.

  The injector 140 injects the resin 54 a to be the second resin portion 54 of the frame 50 into the mold 130. The resin 54a injected from the nozzle of the injector 140 is sent to the gate 122 of the upper mold 120 through a runner (not shown). The head portion 142 of the injector 140 is a portion that advances and retreats along the vertical direction by, for example, a screw or a plunger. By moving the head portion 142, the injection amount and injection pressure of the resin 54a injected from the injector 140 can be adjusted. The injector 140 is controlled by a controller (not shown).

  When the upper mold 120 is overlaid on the lower mold 110 in which the electrode stack 58 is accommodated, as shown in FIG. 6, a gap is formed between the mold 130 and the electrode stack 58 as the first described above. A gap portion 61 (second gap portion) corresponding to the protruding portion 60 of the overhang portion 55a and a gap portion 63 (first gap portion) corresponding to the base portion 62 are formed. Further, a gap portion 61 corresponding to the protruding portion 60 of the second overhang portion 55 b and a gap portion 63 corresponding to the base portion 62 are also formed as a gap between the mold 130 and the electrode laminate 58.

  Next, a procedure for manufacturing the power storage module 12 using the manufacturing apparatus 100 shown in FIGS. 5 and 6 will be described with reference to the flowchart of FIG.

When manufacturing the power storage module 12, first, the electrode stack 58 is disposed in the cavity 112 of the lower mold 110, and the upper mold 120 is overlaid on the lower mold 110 along a predetermined guide pin. The stacked body 58 is disposed in the mold 130. (Step S1 in FIG. 7) Next, a resin 54a to be the second resin portion is injected. Specifically, the controller controls the injector 140 to inject the resin 54a from each gate 122 of the upper mold 120 into the cavity 112. (Step S2 in FIG. 7)
The resin 54a that has flowed into the gap G from the gate 122 flows along each side of the gap G, covers the periphery of the electrode stack 58, and also flows into the gap portions 61 and 63 corresponding to the overhang portions. At this time, as shown in FIG. 6, the resin 54 a is difficult to flow into the narrow gap portion 63 corresponding to the base portion 62. On the other hand, since the gap portion 61 corresponding to the protruding portion 60 is larger than the gap portion 63, the resin 54a easily flows and the gap portion 61 is filled with the resin 54a. When the gap portion 61 corresponding to the protrusion 60 is filled with the resin 54 a to some extent, the resin 54 a that has flowed into the gap portion 61 starts to flow from the gap portion 61 toward the gap portion 63. As a result, the resin portion 54a flows into the gap portion 63 corresponding to the base portion 62 from three directions as shown in FIG. 6, and the resin filling into the gap portion 63 is promoted more than when the resin 54a flows from one direction. .

  After the cavity 112 including the gap portions 61 and 63 is filled with the resin 54a, a predetermined curing process is performed (step S3 in FIG. 7). Thereby, the 2nd resin part 54 which resin 54a hardened is obtained. Further, the resin 54a that has flowed into the gap portions 61 and 63 becomes the protruding portion 60 and the base portion 62 of the overhang portion 55, respectively.

  The power storage modules 12 described above can be stacked in the manner shown in FIG. That is, when the upper power storage module 12A and the lower power storage module 12B adjacent in the Z direction are overlapped, the second resin portion 54 of the upper power storage module 12A is changed to the second resin portion 54 of the lower power storage module 12B. A projecting portion 60 of the second overhang portion 55b projecting toward the second and a first overhang portion 55a projecting from the second resin portion 54 of the lower power storage module 12B toward the second resin portion 54 of the upper power storage module 12A. The protrusions 60 are engaged with each other, and the air holes 64 are defined between the protrusions 60. The size and position of the vent hole 64 can be adjusted by adjusting the dimensions of the protruding portion 60 and the base portion 62 of the overhang portion 55. In the present embodiment, four vent holes 64 are defined by the upper power storage module 12A and the lower power storage module 12B at equal intervals. In addition, each vent 64 communicates with the through hole 14a of the conductive plate 14 interposed between the upper power storage module 12A and the lower power storage module 12B.

  When the upper power storage module 12A and the lower power storage module 12B are overlapped, the protruding portion 60 of one power storage module 12 is close to the other power storage module 12 but not in contact therewith. The protruding portion 60 of one power storage module 12 may be brought into contact with the other power storage module 12, but in this case, it may be difficult to apply a sufficient restraining load by the restraining plates 16A and 16B. Can occur.

  According to the power storage device 10 including the power storage module 12 and the manufacturing method thereof, when the second resin portion 54 is molded, the protrusion 60 of the overhang portion 55 has a thickness H1 thicker than the thickness h1 of the base portion 62. Therefore, the resin 54 a is more likely to flow into the gap portion 61 of the mold 130 corresponding to the protruding portion 60 than the gap portion 63 of the mold 130 corresponding to the base portion 62. The resin 54 a that has flowed into the gap portion 61 can flow into the gap portion 63 along the edge of the first resin portion 52 (that is, along the X direction). Therefore, even if the thickness h1 of the base portion 62 of the overhang portion 55 is reduced in order to promote heat dissipation of the conductive plate 14 and the gap portion 63 becomes narrow, the resin 54a is sufficiently filled in the gap portion 63. Can be filled.

  Therefore, in the power storage device 10, a defective molding of the frame body 50 is suppressed by the projecting portion 60 provided in parallel to the base portion 62 while maintaining sufficient heat dissipation performance by the base portion 62 of the overhang portion 55.

  In particular, in the above-described embodiment, both the first overhang portion 55a and the second overhang portion 55b of the second resin portion 54 have protrusions arranged in parallel to the base portion 62 while maintaining sufficient heat dissipation performance by the base portion 62. The molding failure of the frame 50 can be suppressed by the portion 60.

  In the above-described embodiment, since the protruding portions 60 of the first overhang portions 55a and the protruding portions 60 of the second overhang portions 55b protrude alternately along the edge of the first resin portion 52, the Z direction The plurality of power storage modules 12 can be arranged so that the protrusions 60 of the second resin portions 54 of the adjacent power storage modules 12A and 12B are not in contact with each other.

  In the above-described embodiment, the protruding portion 60 of the second overhang portion 55b protruding from the second resin portion 54 of the upper power storage module 12A toward the second resin portion 54 of the lower power storage module 12B, and the lower side The projection portion 60 of the first overhang portion 55a that projects from the second resin portion 54 of the storage module 12B toward the second resin portion 54 of the upper storage module 12A meshes with the vent 64 in the space between the projections 60. By defining the above, it is possible to send a refrigerant such as air to the conductive plate 14 interposed between the power storage modules 12A and 12B through the vent hole 64. In particular, since the vent hole 64 and the through hole 14a of the conductive plate 14 interposed between the power storage modules 12A and 12B communicate with each other, the refrigerant sent through the vent hole 64 promotes heat dissipation of the conductive plate 14. obtain.

  The present invention is not limited to the above-described embodiments, and can be modified in various ways.

  For example, the shape of the protruding portion 60 of the overhang portion 55 is not limited to a rectangular shape, and may be a shape as shown in FIGS. The protrusion 60A shown in FIG. 9A has a shape in which the upper corner of the protrusion 60 is chamfered. The protrusion 60B shown in FIG. 9B is a trapezoid (more specifically, a trapezoid whose upper side is shorter than the lower side). The protrusion 60C shown in FIG. 9C has a shape in which the side surface of the protrusion 60B is curved inward.

  Even if it is protrusion part 60A-60C of these shapes, there exists the same or equivalent effect as the protrusion part 60 mentioned above.

  Further, the number and position of the protrusions 60 of the overhang portion 55 can be changed as appropriate.

  Furthermore, in the said embodiment or modification, although the electrical storage apparatus 10 gave and demonstrated the example of the nickel hydride secondary battery, the electrical storage apparatus 10 may be a lithium ion secondary battery. In this case, the positive electrode active material is, for example, a composite oxide, metallic lithium, sulfur or the like. Examples of the negative electrode active material include carbon such as graphite, highly oriented graphite, mesocarbon microbeads, hard carbon, and soft carbon, alkali metals such as lithium and sodium, metal compounds, and SiOx (0.5 ≦ x ≦ 1.5). And metal oxides such as boron and carbon added with boron.

  DESCRIPTION OF SYMBOLS 10 ... Power storage device, 12 ... Power storage module, 30 ... Laminated body, 32 ... Bipolar electrode, 34 ... Electrode plate, 34a ... Edge, 34b ... End face, 36 ... Positive electrode, 38 ... Negative electrode, 50 ... Frame, 52 ... 1st 1 resin part, 54 ... second resin part, 54a ... resin, 55, 55a, 55b ... overhang part, 58 ... electrode laminate, 60, 60A, 60B, 60C ... projecting part, 62 ... base part, 61, 63 ... Cavity part, 100 ... manufacturing apparatus, 130 ... mold, V ... space.

Claims (7)

A laminated body in which a plurality of bipolar electrodes each having a positive electrode layer provided on one surface of the electrode plate and a negative electrode layer provided on the other surface of the electrode plate are stacked in a first direction via a separator; and the plurality of bipolar electrodes A plurality of first resin portions that hold the edge portions of the electrode plates, and a cylindrical second resin portion provided around the plurality of first resin portions when viewed from the first direction. A plurality of power storage modules arranged in the first direction;
A conductor disposed between the power storage modules adjacent in the first direction and in contact with the stacked body of each of the adjacent power storage modules;
The second resin portion of the frame has an overhang portion that covers an edge portion of the first resin portion that is located on the outermost side in the first direction among the plurality of first resin portions from the first direction. And
The overhang portion has a first portion having a first thickness as a thickness in the first direction, and a second thickness that is thicker than the first thickness and protrudes in the first direction. A power storage device including two portions, wherein the first portion and the second portion are arranged along an edge of the first resin portion. The overhang portion covers a first overhang portion covering the edge portion of the first resin portion located on the outermost side on one side, and a second overhang covering the edge portion of the first resin portion located on the outermost side on the other side. Including
Each of the first overhang portion and the second overhang portion includes the first portion and the second portion, and the first portion and the second portion are along an edge of the first resin portion. The power storage device according to claim 1, wherein the power storage devices are arranged side by side.   The power storage device according to claim 2, wherein the second portion of the first overhang portion and the second portion of the second overhang portion protrude alternately along an edge portion of the first resin portion.   In the frame of the power storage module adjacent in the first direction, the second portion of the overhang portion protrudes from one frame toward the other, and one frame from the other frame The power storage device according to any one of claims 1 to 3, wherein the second portion of the overhang portion projects toward the top.   The second portion of the overhang portion protruding from the one frame body toward the other frame body, and the second portion of the overhang portion protruding from the other frame body toward the one frame body. The power storage device according to claim 4, wherein a ventilation hole is defined. A through hole is formed in which the conductor extends along a direction orthogonal to the first direction;
The power storage device according to claim 5, wherein the vent hole communicates with the through hole of the conductor. A laminated body in which a plurality of bipolar electrodes each having a positive electrode layer provided on one surface of the electrode plate and a negative electrode layer provided on the other surface of the electrode plate are stacked in a first direction via a separator; and the plurality of bipolar electrodes A plurality of first resin portions that hold the edge portions of the electrode plates, and a cylindrical second resin portion provided around the plurality of first resin portions when viewed from the first direction. A plurality of power storage modules arranged in the first direction;
A method for manufacturing a power storage device that manufactures a power storage device that is disposed between the power storage modules adjacent in the first direction and includes a conductor in contact with each of the stacked bodies of the adjacent power storage modules,
An electrode laminate in which a plurality of the bipolar electrodes provided with the first resin portion are stacked is accommodated in a cavity of a mold, and a first gap is formed around the electrode laminate as viewed from the first direction. And forming a second gap in which an overhang portion is formed to cover the edge of the first resin portion located in the outermost position in the first direction among the plurality of first resin portions from the first direction. And a process of
Injecting resin to be the second resin part into the cavity of the mold, and filling the first gap and the second gap with resin to be the second resin part;
Curing the resin to be the second resin part and forming the second resin part,
A first gap portion corresponding to a first portion of the overhang portion, wherein the second gap has a first thickness as a thickness in the first direction, and a second thickness that is greater than the first thickness. And a second gap portion corresponding to a second portion of the overhang portion projecting in the first direction, wherein the first gap portion and the second gap portion are the first resin. Line along the edge of the part,
In the step of filling the second gap with the resin to be the second resin part, the power storage device in which the resin to be the second resin part flows from the second gap part toward the first gap part Manufacturing method.

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