JP2013074205A - Power storage element, power storage device and circuit board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure which facilitates connection to a part where a plurality of power storage elements are connected in series, when connecting a plurality of power storage elements in series.SOLUTION: A power storage element 10 includes a first electrode 11 having a first polarizable electrode provided on the surface of a first collector, a second electrode 12 having a second polarizable electrode provided on the surface of a second collector and facing the first polarizable electrode via a separator, a first lead-out part 11L connected electrically with the first collector and being led out from the first electrode 11, and a second lead-out part 12L connected electrically with the second collector and being led out from the second electrode 12 in a direction other than the direction parallel with the lead-out direction of the first lead-out part, when viewed from the facing direction of the first and second polarizable electrodes.

Description

  The present invention relates to a power storage element such as an EDLC (Electric Double Layer Capacitor), a power storage device using the same, and a circuit board on which the power storage device is mounted.

  A flat-type power storage element is described in Patent Document 1, for example. In such a flat power storage element, a plurality of leads extend from the inside to the outside of the exterior body having a square planar shape. By connecting two or more of these power storage elements in series, the rated voltage increases.

International Publication No. 2007/063877

  However, in the electric device (storage element) described in Patent Document 1, two electrode tabs of one electric device are drawn in opposite directions. When such electric devices are connected in series, the portions where the electrode tabs are connected to each other overlap when viewed from the stacking direction of the electric devices. For this reason, there existed a problem that it was difficult to connect the circuit which adjusts the balance between electrical devices, and the part which connected electrode tabs. An object of this invention is to provide the structure which is easy to connect to the part which connected several electrical storage elements in series, when connecting several electrical storage elements in series.

  The present invention provides a first electrode in which a first polarizable electrode is provided on a surface of a first current collector, a second polarizable electrode is provided on a surface of a second current collector, and the second polarizable electrode is A second electrode opposed to the first polarizable electrode via a separator; a first extraction portion electrically connected to the first current collector and drawn from the first electrode; and the second collection In addition to being electrically connected to an electric body and viewed from the direction in which the first polarizable electrode and the second polarizable electrode face each other, it is not parallel to the direction in which the first lead portion is drawn out And a second lead portion drawn from the second electrode in the direction.

  This power storage element has the above-described structure, so that the first lead portion and the second lead portion can be freely drawn according to the design of the circuit board. As a result, an effect of increasing the degree of freedom in designing the circuit board can be obtained.

  In the present invention, an angle θ formed by a straight line parallel to the direction in which the first lead portion is drawn from the first electrode and a straight line parallel to the direction in which the second lead portion is drawn from the second electrode is 360. / N degrees (n is an integer of 3 or more) is preferable.

  This power storage element forms leads (first lead portion and second lead portion) at a constant angle. Therefore, a mathematical design angle can be obtained in designing the circuit board. As a result, an effect of facilitating the design of the substrate circuit can be obtained.

  In the present invention, n is preferably 12 or less.

  In this power storage element, the minimum value of the angle (lead angle) formed by the two leads (the first lead portion and the second lead portion) is 30 degrees. If the angle becomes smaller than this, it becomes difficult to ensure the pad dimensions of the substrate circuit. Since this storage element has an angle of 30 degrees or more, the effect of avoiding the possibility of contact connection with an adjacent pad when the substrate is mounted can be obtained.

  In the present invention, when viewed from the direction in which the first polarizable electrode and the second polarizable electrode face each other, the shapes of the first electrode and the second electrode are preferably an n-gon or a circle. .

  In this power storage element, the electrode has a shape that can be easily calculated mathematically. As a result, when the electrodes are prepared and collected and the leads (first lead portion and second lead portion) are attached, it is possible to easily locate the lead attachment position.

  The present invention is a power storage device in which a plurality of the power storage elements are stacked and the first lead portion and the second lead portion of the adjacent power storage elements are electrically connected.

  This power storage element is formed by connecting a plurality of power storage elements in series. With such a structure, the rated voltage of the power storage element can be increased by a multiple of the series number. As a result, it is possible to obtain an effect that a design with an increased operating voltage as a storage element can be performed from the viewpoint of a circuit.

  In the present invention, the number D of the plurality of power storage elements is preferably D ≦ ceil ((360−θ) / θ). Here, ceil (x) represents a ceiling function and is defined as the smallest integer equal to or greater than x with respect to the real number x.

  The maximum number D of the power storage elements is a number obtained based on an angle formed by the first lead portion and the second lead portion, that is, a lead angle. This power storage device has an effect that it is easy to connect three or more series by providing a certain lead angle.

  In the present invention, when viewed from the direction in which the first polarizable electrode and the second polarizable electrode face each other, the shape of at least one of the power storage elements is different from the shape of the other power storage elements. May be.

  This power storage element may have a shape in which opposed electrodes are different. Depending on the shape of the electrode, when connecting the lead (first lead part or second lead part), it is possible to use an electrode shape that makes it easy to control the connection position. By combining these, the lead can be drawn in any direction. The effect of being able to be obtained.

  In the present invention, the first drawer part that is not electrically connected to the second drawer part, the second drawer part that is not electrically connected to the first drawer part, and the first drawer part It is preferable that the terminal of the conductor is electrically connected to the connection portion with the second lead portion.

  In this power storage element, a metal terminal different from the lead (first lead portion or second lead portion) drawn from the electrode is connected to the lead so that solder connection processing when mounting the substrate is easy. preferable. For example, Ni, Cu, and a metal with good wettability with solder may be used. As a result, it is easy to connect the electrode of the substrate and the lead with solder, and an effect that a reliable connection can be obtained is obtained.

  The present invention is a power storage device in which a plurality of power storage elements including at least one power storage element are arranged in the same plane and connected in series.

  This power storage element is obtained by connecting a plurality of power storage elements in series on the same plane. Thereby, the rated voltage of an electrical storage element can be enlarged by the multiple of the series number, and the connection to a surface direction can be performed. As a result, from the viewpoint of the circuit, it is possible to design with an increased operating voltage as a power storage element, and to obtain an effect of suppressing the size in the height direction.

  In the present invention, it is preferable that the terminals of the conductors are electrically connected to the connecting portions of the power storage elements and to both sides of the plurality of power storage elements connected in series.

  In this power storage element, a metal terminal different from the lead (first lead portion or second lead portion) drawn from the electrode is connected to the lead so that solder connection processing when mounting the substrate is easy. preferable. The metal terminal is, for example, Ni or Cu, and may be a metal having good wettability with solder. As a result, it is easy to connect the electrode of the substrate and the lead with solder, and an effect that a reliable connection can be obtained is obtained.

  In the present invention, the surface of the terminal is preferably coated with Sn-Cu or Cu-Ni.

  In this power storage element, the surface of the connected metal terminal is processed. By coating the surface of the metal terminal with Sn—Cu or Cu—Ni by plating, the effect of improving the wettability of the solder can be obtained.

  In the present invention, it is preferable that the power storage device is housed in an exterior body, and the terminal is taken out of the exterior body.

  This power storage element is housed in an exterior body, and a lead (first lead portion or second lead portion) is taken out from the inside. The exterior body is obtained by covering both surfaces of a metal foil with a resin layer. The metal foil includes Al or SUS (stainless steel), and the resin layer includes PP (polypropylene), PET (polyethylene terephthalate), and nylon. By storing the power storage element in the exterior body, an effect that resistance in a use environment can be increased is obtained.

  The present invention includes the power storage device, the substrate on which the power storage device is mounted, a substrate having an electrode pad on the surface, a surface of the exterior body, and a fixing member that is interposed between the substrate and fixes both A circuit board comprising: a solder material interposed between the electrode pads and the terminals to electrically connect them.

  The power storage element includes a solder connection with a terminal and a fixing member with the main body in fixing to the substrate. Thereby, the whole electrical storage element will be fixed to a board | substrate, and the effect that the disconnection of the lead (1st drawer part or 2nd drawer part) by a vibration can be suppressed will be acquired.

  The present invention can provide a structure in which a plurality of power storage elements can be easily connected to a part where the plurality of power storage elements are connected in series when the plurality of power storage elements are connected in series.

FIG. 1 is a plan view of the energy storage device according to the first embodiment. FIG. 2 is a cross-sectional view taken along the line AA of FIG. 3 is a cross-sectional view taken along line BB in FIG. FIG. 4 is a plan view showing a direction in which the first lead portion is drawn from the first electrode and a direction in which the second lead portion is drawn from the second electrode. FIG. 5 is a plan view showing another shape of the first current collector and the second current collector. FIG. 6 is a plan view showing a power storage element according to a modification of the first embodiment. FIG. 7 is a cross-sectional view taken along the line AA of FIG. FIG. 8 is a plan view illustrating an example of a power storage device in which a plurality of power storage elements according to this embodiment are stacked. FIG. 9 is a diagram illustrating a state where the power storage device is viewed from the direction of arrow D in FIG. 8. 10-1 is explanatory drawing of the method to manufacture the electrical storage element which concerns on Embodiment 1, and the electrical storage apparatus using multiple this. 10-2 is explanatory drawing of the method to manufacture the electrical storage element which concerns on Embodiment 1, and the electrical storage apparatus using multiple this. 10-3 is explanatory drawing of the method to manufacture the electrical storage element which concerns on Embodiment 1, and the electrical storage apparatus using multiple this. 10-4 is explanatory drawing of the method to manufacture the electrical storage element which concerns on Embodiment 1, and the electrical storage apparatus using multiple this. 10-5 is explanatory drawing of the method of manufacturing the electrical storage element which concerns on Embodiment 1, and an electrical storage apparatus using multiple this. 10-6 is explanatory drawing of the method to manufacture the electrical storage element which concerns on Embodiment 1, and the electrical storage apparatus using multiple this. 10-7 is explanatory drawing of the method of manufacturing the electrical storage element which concerns on Embodiment 1, and an electrical storage apparatus using multiple this. 10-8 is explanatory drawing of the method to manufacture the electrical storage element which concerns on Embodiment 1, and the electrical storage apparatus using multiple this. 10-9 is explanatory drawing of the method to manufacture the electrical storage element which concerns on Embodiment 1, and the electrical storage apparatus using multiple this. 10-10 is explanatory drawing of the method to manufacture the electrical storage element which concerns on Embodiment 1, and the electrical storage apparatus using multiple this. FIG. 11 is a plan view showing an example in which a conductor terminal is connected to a first lead portion and a second lead portion that are terminal electrodes. FIG. 12 is a side view showing a circuit board on which a power storage device obtained by stacking power storage elements according to the present embodiment is mounted on a substrate. FIG. 13 is a plan view of the energy storage device according to the second embodiment. FIG. 14 is a plan view of the energy storage device according to the second embodiment. 15 is a cross-sectional view taken along the line BB in FIG. FIG. 16A is a plan view of a power storage element according to a modification of the second embodiment. FIG. 16-2 is a side view of the energy storage device according to the modification of the second embodiment. FIG. 17 is a plan view of the energy storage device according to the third embodiment. FIG. 18 is a plan view showing a power storage device in which a plurality of power storage elements according to the third embodiment are stacked. FIG. 19 is a plan view of the energy storage device according to the fourth embodiment. FIG. 20 is a plan view showing a power storage device in which a plurality of power storage elements according to the fourth embodiment are stacked. FIG. 21 is a plan view of the energy storage device according to the fifth embodiment. FIG. 22 is a plan view showing a power storage device in which a plurality of power storage elements according to Embodiment 5 are arranged on the same plane. FIG. 23 is a plan view of the energy storage device according to the sixth embodiment. FIG. 24 is a plan view showing a power storage device in which a plurality of power storage elements according to Embodiment 6 are arranged on the same plane.

  DESCRIPTION OF EMBODIMENTS Embodiments (embodiments) for carrying out the present invention will be described in detail with reference to the drawings. The present invention is not limited by the contents described in the following embodiments. The constituent elements described below include those that can be easily assumed by those skilled in the art and those that are substantially the same. Furthermore, the constituent elements described below can be appropriately combined. Furthermore, the constituent elements disclosed in the following embodiments can be appropriately combined. In addition, various omissions, substitutions, or changes of components can be made without departing from the scope of the present invention.

(Embodiment 1)
FIG. 1 is a plan view of the energy storage device according to the first embodiment. FIG. 2 is a cross-sectional view taken along the line AA of FIG. 3 is a cross-sectional view taken along line BB in FIG. FIG. 4 is a plan view showing a direction in which the first lead portion is drawn from the first electrode and a direction in which the second lead portion is drawn from the second electrode. In this embodiment, the electrical storage element 10 is EDLC. However, the electricity storage element 10 is not limited to EDLC, but is a lithium ion capacitor, an electrolytic capacitor, an all-solid battery in which the electrolytic solution is changed to a solid electrolyte, a lithium ion battery, a magnesium ion battery, a calcium ion battery, or other secondary batteries. It can also be applied to batteries and the like.

  The power storage element 10 includes a first electrode 11, a second electrode 12, a first lead portion 11L, and a second lead portion 12L. As shown in FIGS. 2 and 3, the first electrode 11 is provided with a first polarizable electrode 11S on the surface of the first current collector 11C. As shown in FIGS. 2 and 3, the second electrode 12 is provided with a second polarizable electrode 12S on the surface of the second current collector 12C. In the second electrode 12, the second polarizable electrode 12S faces the first polarizable electrode 11S through the separator 13.

  The first lead portion 11L is electrically connected to the first current collector 11C and is drawn from the first electrode 11. The second lead portion 12L is electrically connected to the second current collector 12C, and the first polarizable electrode 11S and the second polarizable electrode 12S face each other (in the direction of the arrow R in FIGS. 2 and 3). When viewed from the direction shown), the first lead portion 11L is pulled out from the second electrode 12 in a direction other than parallel to the direction in which it is pulled out.

  Each of the first current collector 11C and the second current collector 12C is a rectangular sheet-like or foil-like conductor in plan view, more specifically, a square sheet-like or foil-like conductor. Therefore, the shape of the first electrode 11 and the second electrode 12 in plan view is the same as that of the first current collector 11C and the second current collector 12C. As will be described later, the shape of the first current collector 11C and the second current collector 12C in plan view is not limited to a square. The plan view is a state viewed from a direction orthogonal to the surface 11P or 12P of the first current collector 11C or the second current collector 12C. The direction orthogonal to the surface 11P of the first current collector 11C and the surface 12P of the second current collector 12C corresponds to the direction in which the first polarizable electrode 11S and the second polarizable electrode 12S face each other. The surface 11P of the first current collector 11C is the surface of the first electrode 11, and the surface 12P of the second current collector 12C is the surface of the second electrode 12.

  The direction in which the first extraction portion 11L is extracted from the first electrode 11 (first extraction direction) is the direction indicated by the arrow C1 in FIGS. 1 and 4, and the direction in which the second extraction portion 12L is extracted from the second electrode 12. (Second pull-out direction) is a direction indicated by an arrow C2 in FIGS. The first extraction direction is a direction from the center of the first electrode 11 having a square shape in plan view to the outside, and the first extraction portion 11 </ b> L extends from the first electrode 11. The second extraction direction is a direction from the center of the second electrode 12 having a square shape in plan view to the outside, and the second extraction portion 12L extends from the second electrode 12.

  Each of the first drawing portion 11L and the second drawing portion 12L is a sheet-like or foil-like member having a rectangular shape in plan view. The first lead portion 11 </ b> L is attached to the first electrode 11 with its long side orthogonal to one side of the first electrode 11. Similarly, the second lead portion 12 </ b> L is attached to the first electrode 11 with its long side orthogonal to one side of the second electrode 12. With such a structure, the first lead portion 11L extends from the first electrode 11 in the direction parallel to the long side, and the second lead portion 12L is the second electrode 12 in the direction parallel to the long side. Extend from. For this reason, in the electricity storage device 10, the direction parallel to the long side of the first lead portion 11L, that is, the longitudinal direction of the first lead portion 11L corresponds to the first lead direction, and is parallel to the long side of the second lead portion 12L. Direction, that is, the longitudinal direction of the second extraction portion 12L corresponds to the second extraction direction.

  As shown in FIGS. 1 and 4, when viewed from the direction in which the first polarizable electrode 11S and the second polarizable electrode 12S face each other, that is, in plan view, the second lead portion 12L is the first lead portion. 11L is pulled out in a direction other than parallel to the direction in which it is pulled out. That is, as shown in FIG. 4, the power storage element 10 includes a straight line L1 parallel to the direction in which the first extraction portion 11L is extracted from the first electrode 11 (first extraction direction), and the second extraction portion 12L is the second electrode. The angle (drawing angle) θ formed by the straight line L2 parallel to the direction drawn from 12 (second drawing direction) is larger than 0 degree and smaller than 180 degrees. In the present embodiment, the extraction angle θ is 90 degrees. The straight line L1 and the straight line L2 'have a drawing angle θ of 180 degrees. When the drawing angle θ is 180 degrees, the first drawing portion 11L and the second drawing portion 12L are drawn in opposite directions.

  In the present embodiment, the extraction angle θ is 360 / n degrees (n is an integer of 3 or more). The electricity storage element 10 has n = 4 and the lead angle θ is 90 degrees. This corresponds to the shape of the electricity storage element 10 in a plan view being a square (quadrangle).

  A plurality of power storage elements 10 are stacked in a direction orthogonal to the surface 11P of the first electrode 11 and the surface 12P of the second electrode 12. And the electrical storage apparatus which connected the some electrical storage element 10 in series can be made by electrically connecting the 1st drawer | drawing-out part 11L and the 2nd drawer | drawing-out part 12L of the electrical storage element 10 which adjoins. Since the first lead-out direction and the second lead-out direction of the power storage element 10 are non-parallel, the plurality of power storage elements 10 can be formed by appropriately setting the number of the power storage elements 10 stacked and the size of the lead-out angle θ. When the power storage device obtained by stacking is viewed from a direction parallel to the stacking direction, the first lead portion 11L1, and a plurality of connecting portions between the first lead portion 11L1 and the second lead portion 12L exist. , The second drawing part 12L does not overlap. That is, the first lead portion 11L1, the second lead portion, and the plurality of connection portions extend to different positions in the circumferential direction of the power storage device. In this embodiment, the number D of power storage elements 10 included in a power storage device in which a plurality of power storage elements 10 are connected in series is preferably D ≦ ceil ((360−θ) / θ). Here, ceil (x) represents a ceiling function, and is defined by a minimum integer equal to or larger than x with respect to the real number x.

  Since a power storage device in which a plurality of power storage elements 10 are connected in series needs to balance the power storage elements 10 (cell balance), an adjustment circuit is provided at the joint between the first lead portion 11L1 and the second lead portion 12L. Often connected. As described above, in the power storage element 10, since the connection portions of the plurality of first lead portions 11L1 and second lead portions 12L do not overlap, the adjustment circuit is easily and reliably connected to the power storage device. Can do. Next, the internal structure of the electricity storage element 10 will be described.

  The 1st current collector 11C of the 1st electrode 11 and the 2nd current collector 12C of the 2nd electrode 12 are manufactured with metal foil which is a conductor. As the first current collector 11C and the second current collector 12C, in addition to an aluminum foil or a titanium foil having a smooth surface, those whose surfaces are roughly processed by embossing or etching can be used. Since the first current collector 11C and the second current collector 12C have the same shape as the first electrode 11 and the second electrode 12, the plan view has a square shape. The first lead portion 11L is attached to the surface of the first current collector 11C having such a shape and extended from one side, and the second lead portion 12L is attached to the surface of the second current collector 12C and extended from one side. . The first current collector 11C to which the first lead portion 11L is attached is desirably free of the first polarizable electrode 11S, and is preferably removed in advance. Similarly, the second current collector 12C to which the second lead portion 12L is attached is desirably free of the second polarizable electrode 12S, and is preferably removed in advance.

  FIG. 5 is a plan view showing another shape of the first current collector and the second current collector. The first current collector 11C to be the first electrode 11 is a sheet or foil-like conductor having a square shape in plan view, and an attachment portion 11T for attaching the first extraction portion 11L protrudes from one side of the square. . The second current collector 12C to be the second electrode 12 is also a square sheet or foil-like conductor in plan view, and an attachment portion 12T for attaching the second lead portion 12L protrudes from one side of the square. As described above, the first current collector 11C and the second current collector 12C have the attachment portions 11T and 12T, respectively, so that the first lead portion 11L and the second lead portion 12L are connected to the first current collector 11C and the second current collector 11C. 2 It becomes easy to attach to the current collector 12C. In addition, it is desirable that the attachment portions 11T and 12T do not have the first polarizable electrode 11S and the second polarizable electrode 12S. By doing in this way, the attachment parts 11T and 12T, when a large number of the first electrodes 11 and the second electrodes 12 are alternately stacked via the separator 13, the attachment parts 11T that overlap with the first lead part 11L. And the attachment part 12T which overlapped many 2nd drawer | drawing-out part 12L can be connected easily.

  In the present embodiment, the first lead portion 11L and the second lead portion 12L are a material containing Al. In addition, although the 1st extraction part 11L and the 2nd extraction part 12L are Al as a main component, they may contain a trace amount impurity. The content rate of Al used for the 1st extraction part 11L and the 2nd extraction part 12L is at least 50 mass% or more. In consideration of electrical conductivity and resistance to the electrolytic solution, the content range is preferably 95% by mass or more. In this way, it is possible to obtain the first lead portion 11L and the second lead portion 12L that are excellent in electrical conductivity and resistance to the electrolytic solution.

  The first polarizable electrode 11S and the second polarizable electrode 12S are active material layers. The first polarizable electrode 11S and the second polarizable electrode 12S can be manufactured using a porous material. The porous material used for the first polarizable electrode 11S and the second polarizable electrode 12S can be manufactured, for example, by mixing activated carbon with a binder resin. Examples of the binder resin include fluorine-containing polymer compounds such as polytetrafluoroethylene and polyvinylidene fluoride, rubber-based polymer compounds such as styrene butadiene rubber, and carboxymethyl cellulose. In the first polarizable electrode 11S and the second polarizable electrode 12S, carbon black, carbon nanotubes, fine particles of graphite or fine fibers may be blended as a conductive additive as necessary. When manufacturing the first polarizable electrode 11S and the second polarizable electrode 12S, these materials are applied to one side or both sides of the first current collector 11C and the second current collector 12C.

  As a method of manufacturing the first electrode 11 and the second electrode 12, a method of adhering to the first current collector 11C and the second current collector 12C after adding a conductive additive and a binder to activated carbon to form a sheet, In addition, there is a method of applying activated carbon to the first current collector 11C and the second current collector 12C in a slurry state. As a method for applying the slurry-like activated carbon to the first current collector 11C and the second current collector 12C, there are an applicator method, a gravure method, a reverse roll method, an extrusion (nozzle) method, a dip method, and the like.

  The separator 13 is interposed between the first polarizable electrode 11S of the first electrode 11 and the second polarizable electrode 12S of the second electrode 12. As shown in FIGS. 1 to 3, in the present embodiment, the separator 13 has a square shape in plan view. The separator 13 extends outside the outer peripheral portions of the first electrode 11 and the second electrode 12. As the separator 13, for example, a nonwoven fabric or a porous film containing a polyolefin resin having a mass ratio of 10% or more can be used. By applying pressure to the pair of polarizable electrodes, that is, the first polarizable electrode 11S and the second polarizable electrode 12S in a temperature environment equal to or higher than the softening point temperature of the polyolefin resin, the first polarizable electrode 11S. The second polarizable electrode 12S and the separator 13 can be bonded together. As the separator 13, a cellulose nonwoven fabric or an aramid fiber nonwoven fabric may be used.

  In the electricity storage element 10, an electrolytic solution is interposed between the first polarizable electrode 11S and the second polarizable electrode 12S. As the electrolytic solution, either an aqueous solution or an organic solution can be used. Examples of the solvent for the organic electrolyte include propylene carbonate, ethylene carbonate, dimethyl carbonate, methyl ethyl carbonate, diethyl carbonate, γ-butyrolactone, dimethylformamide, sulfolane, acetonitrile, propionitrile, and methoxyacetonitrile. As solutes, ammonium salts, amine salts, amidine salts, and the like are known.

  FIG. 6 is a plan view showing a power storage element according to a modification of the first embodiment. FIG. 7 is a cross-sectional view taken along the line AA of FIG. The power storage element 10 ′ is obtained by enclosing the power storage element 10 described above in an exterior body 14. Other structures are the same as those of the power storage element 10 described above. The power storage element 10 ′ includes the power storage element 10 housed in the exterior body 14, and a first lead portion 11 </ b> L and a second lead portion 12 </ b> L extending from the outer peripheral portion of the power storage element 10.

  The exterior body 14 has a size larger than that of the power storage element 10, and the first extraction portion 11 </ b> L and the second extraction portion 12 </ b> L extend outward from the outer peripheral portion of the exterior body 14. As shown in FIG. 7, the exterior body 14 is formed by superimposing the first laminate sheet 14 </ b> A and the second laminate sheet 14 </ b> B and bonding the peripheral side regions around these. 14 A of 1st laminate sheets and 2nd laminate sheet 14B coat | cover the outer surface and inner surface of an aluminum thin film with the resin layer, respectively. Sealing materials 15A and 15B are interposed between the exterior body 14 and the first lead portion 11L and between the exterior body 14 and the second lead portion 12L. The sealing materials 15A and 15B seal between the exterior body 14 and the first lead portion 11L. In the following description, the sealing materials 15A and 15B may be omitted.

  As shown in FIG. 7, the electricity storage element 10 is disposed in the sealed internal spaces 14SA and 14SB of the exterior body 14 together with the electrolytic solution. The power storage element 10 can accumulate charges through the first lead portion 11L and the second lead portion 12L, and can also release the accumulated charges.

  In the present modification, the shape of the exterior body 14 in plan view is a polygon (in this example, a quadrangle, more specifically a square, in accordance with the position where the first lead portion 11L and the second lead portion 12L are pulled out. ) Is preferred. A power storage device having a plurality of power storage elements 10 ′ is formed by stacking a plurality of power storage elements 10 ′ and electrically connecting the first lead portion 11L and the second lead portion 12L of the adjacent power storage elements 10 ′. Can do. In this case, the plurality of power storage elements 10 ′ are stacked, and the power storage element 10 ′ is rotated around an axis that is orthogonal to the stacking direction and passes through the center (centroid) of the power storage element 10 ′ in plan view. In this way, the positions of the first lead portion 11L and the second lead portion 12L of the adjacent power storage element 10 'are overlapped. The overlapped first lead portion 11L and second lead portion 12L are connected and welded outside the exterior body 14. Note that when a plurality of the above-described power storage elements 10 are stacked to form a power storage device, the same technique as that when the power storage element 10 ′ is used can be used.

  FIG. 8 is a plan view illustrating an example of a power storage device in which a plurality of power storage elements according to this embodiment are stacked. FIG. 9 is a diagram illustrating a state where the power storage device is viewed from the direction of arrow D in FIG. 8. The power storage device 100 shown in FIGS. 8 and 9 is formed by stacking a plurality (three in this example) of the power storage elements 10 shown in FIGS. 1 to 3, and the first lead portion 11L and the second lead of the adjacent power storage elements 10 are stacked. It can be manufactured by electrically connecting the part 12L. With such a structure, the power storage element 10 includes three power storage elements 10 connected in series. As shown in FIG. 9, an insulator 20 is provided between adjacent power storage elements 10. The material of the insulator 20 is preferably, for example, polyethylene, polypropylene, or a resin material obtained by modifying these. The power storage device 100 may have an exterior body 21 on the outside. As the exterior body 21, for example, a laminate sheet can be used in the same manner as the exterior body 14 included in the power storage element 10 'described above. When the power storage device 100 has the exterior body 21 on the outside, each insulator 20 is sandwiched between the exterior bodies 14. For this reason, the dimension in planar view of the exterior body 21 and the insulator 20 becomes substantially the same.

  In the power storage device 100, the first lead portion 11L and the second lead portion 12L that are not connected to the first lead portion 11L or the second lead portion 12L serve as terminal electrodes connected to external terminals or the like. Each power storage element 10 included in the power storage device 100 is arranged as a thin layer between the first polarizable conductor 11S, the electrolyte (liquid), and the second polarizable electrode 12S. Charge is stored by applying a bias in between. The first lead portion 11L and the second lead portion 12L that are electrically connected are used to control the potential at the connection point between the two power storage elements 10 connected in series. Next, a method for manufacturing the power storage element 10 and a power storage device 100 using a plurality of the power storage elements 10 will be described.

  FIGS. 10-1 to 10-10 are explanatory diagrams of a power storage element according to the first embodiment and a method of manufacturing a power storage device using a plurality of the power storage elements.

  A polarizable electrode is applied to the current collector 1 by an applicator method, and the solvent is removed by drying to obtain a current collector body 2. The current collector body 2 is cut into a shape of 50 mm × 50 mm, and the polarizable electrode at the portion to which the lead portion 3 is attached is removed (not shown). By doing in this way, the drawer | drawing-out part 3 and the electrical power collector 1 can be connected reliably. It is not necessary to remove the polarizable electrode at the portion where the extraction portion 3 is attached. In order to ensure the subsequent adhesion with the exterior body, a material sandwiched between sheets of modified PP is used for the drawer 3 (not shown). The lead portion 3 is overlapped at the place where the polarizable electrode is removed, and this portion is connected by ultrasonic welding. Two of these are prepared as a first electrode 11 and a second electrode 12. The first electrode 11 and the second electrode 12 are opposed to each other so that the first extraction portion 11L and the second extraction portion 12L are in a 90-degree direction via a separator 13 cut out in a 54 mm × 54 mm shape, and Get 10. Three power storage elements 10 are prepared and stacked via an insulator 20 cut out to 60 mm × 60 mm. When stacking, the storage element is rotated by 90 degrees so that the lead-out portion 12L of the adjacent power storage element 10 and the lead-out portion 11L of the adjacent power storage element 10 overlap. By repeating this, three power storage elements 10 are stacked to obtain a power storage element assembly 100a.

  Two exterior bodies 21 cut out to 60 mm × 60 mm are prepared, the electricity storage element assembly 100a is sandwiched, and the three sides of the exterior body 21 are hot-pressed and sealed to obtain a power storage device 100b before sealing. From the remaining one side of the outer package 21 that is not sealed, the electrolytic solution ES is put into each power storage element 10, and the remaining one side is sealed by hot pressing. The connecting portions W are connected to the portions where the lead portions 11L and 12L overlap with each other by ultrasonic welding to obtain the power storage device 100 in which the three power storage elements 10 are connected in series. The number of series is not limited to this, and can be arbitrarily determined.

  FIG. 11 is a plan view showing an example in which a conductor terminal is connected to a first lead portion and a second lead portion that are terminal electrodes. FIG. 12 is a side view showing a circuit board on which a power storage device obtained by stacking power storage elements according to the present embodiment is mounted on a substrate. FIG. 12 illustrates a state where the power storage device 100 illustrated in FIG. 11 is viewed from the direction indicated by the arrow D.

  The power storage device 100 includes, in the stacked power storage elements 10, a first lead portion 11 </ b> L of one power storage device 10 (see FIG. 1), a second lead portion 12 </ b> L of one power storage device 10, and a first lead of the other power storage device 10. Terminals 16L, 17L, and 18L of dissimilar metals as conductors are connected to the respective leading ends of the portions where the portion 11L overlaps and the leading end of the second lead portion 12L of the other storage element 10 so that soldering is easy. It is preferable to keep it. That is, in the stacked power storage elements 10, the leading end of the first leading portion that is not connected to the second leading portion 12L, the leading end of each portion where the first leading portion 11L and the second leading portion 12L are overlapped, and It is preferable that different metal terminals 16L, 17L, and 18L as conductors are connected to the tip of the second lead portion 12L that is not connected to the first lead portion 11L. W denotes a connection portion between the first lead portion 11L and the terminal 16L, a connection portion between the second lead portion 12L and the terminal 18L, and a connection portion between the first lead portion 11L, the second lead portion 12L, and the terminal 17L. The dissimilar metal is preferably nickel or copper provided with a plating layer. The plating layer preferably includes 98 ± 1 (mass%) Sn and 2 ± 1 (mass%) Cu. ± 1% is an allowable error. Moreover, when the said different metal is copper, what plated nickel may be used. A different metal terminal 17L is placed on the tip of the portion where the first lead portion 11L of one power storage element 10 and the second lead portion 12L of the other power storage element 10 are overlapped, and the first lead portion 11L and the second lead portion Dissimilar metal terminals 16L and 18L are overlapped at the tips of the portions where the portion 12L is not overlapped with each other. Then, the overlapped terminals of different metals are connected to the lead portion by ultrasonic welding to form the connection portion W. By doing in this way, the terminal of a different metal can be formed in the front-end | tip of each drawer | drawing-out part. The terminals 16L and 17L are connected to the pads 112 of the substrate by solder 113. For the connection between the first lead portion 11L and the second lead portion 12L and the dissimilar metal terminals 16L and 17L, the overlapped surfaces may be used entirely.

(Embodiment 2)
13 and 14 are plan views of the energy storage device according to the second embodiment. 15 is a cross-sectional view taken along the line BB in FIG.

  The current collector body to be the first electrode 11a is cut into a regular hexagonal shape with one side being 25 mm, and the polarizable electrode is removed from the portion to which the lead portion 3 (see FIG. 10-3) is attached (not shown). . In order to ensure the subsequent adhesion with the exterior body, a material sandwiched between sheets of modified PP is used for the drawer 3 (not shown). 11 L of 1st extraction parts are piled up in the place from which the polarizable electrode was removed, and this part is connected by ultrasonic welding. Two of these are prepared as a first electrode 11a and a second electrode 12a. A straight line L1 in the direction in which the first lead portion 11L is drawn and a second lead portion through a separator 13 (not shown) in which the first electrode 11a and the second electrode 12a are cut into a regular hexagonal shape with a side of 30 mm. It is made to oppose so that the angle (theta) which cross | intersects the straight line L2 of the direction of 12L pull-out may be 60 degree | times, and the electrical storage element 10a is obtained.

  Five power storage elements 10a are prepared and stacked via an insulator 20 (see FIG. 15) cut into a regular hexagonal shape with a side of 35 mm. When stacking, the storage element is rotated by 60 degrees so that the leading portion 12L of the adjacent power storage element 10a and the leading portion 11L of the adjacent power storage element 10a overlap. This is repeated, and five power storage elements 10a are stacked to obtain a power storage element assembly 100a shown in FIG. Two exterior bodies 21 cut into a regular hexagonal shape with a side of 35 mm are prepared, the power storage element assembly 100a is sandwiched, and 5 sides of the exterior body 21 are hot-pressed and sealed, obtain. An electrolyte solution (not shown) is put into each power storage element 10a from the remaining one side of the unsealed exterior body 21, and the remaining one side is sealed by hot pressing. The portions where the respective lead portions 11L and the second lead portions 12L overlap are connected by ultrasonic welding to form a connection portion W, thereby obtaining a power storage device 100 'in which five power storage elements 10a are connected in series. Each insulator 20 is sandwiched between exterior bodies 21. For this reason, the dimension in planar view of the exterior body 21 and the insulator 20 becomes substantially the same. A part of the insulator 20 is sandwiched between the exterior bodies 21. Since the power storage device 100 ′ has a hexagonal shape, the angle between the power storage element 10 a and the first lead portion 11 </ b> L and the second lead portion 12 </ b> L is maintained at 60 degrees, and an accurate angle can be obtained. The number of series is not limited to this, and can be arbitrarily determined.

(Modification)
FIG. 16A is a plan view of a power storage device according to a modification of the second embodiment. FIG. 16-2 is a side view of the energy storage device according to the modification of the second embodiment. The power storage device 100 a ″ is obtained by sealing a hexagonal power storage element 10 a in a plan view inside the exterior body 21 and laminating a plurality thereof. The electricity storage element 10a (see FIG. 13) is sandwiched between two exterior bodies 21 cut into a regular hexagonal shape with one side of 35 mm. The two exterior bodies 21 sandwiching the electricity storage element 10a are sealed by hot pressing the five sides. In the two exterior bodies 21, the electrolytic solution is injected into the electric storage element 10 a from the remaining one side that is not sealed. Thereafter, the two exterior bodies 21 seal the remaining one side by hot pressing. Thus, the electrical storage element 10a enclosed in the exterior body 21 is obtained.

  A plurality of power storage elements 10a enclosed in the outer package 21 are stacked. And the part where 11 L of drawer | drawing-out parts and the 2nd drawer | drawing-out part 12L of each electrical storage element 10a overlapped is connected by ultrasonic welding, and becomes the connection part W. FIG. Five power storage elements 10a sealed in the outer package 21 are connected in series to form a power storage device 100 ''. Since the power storage device 100 ″ has a hexagonal shape, the angle between the power storage element 10 a, the first extraction unit 11 </ b> L, and the second extraction unit 12 </ b> L is maintained at 60 degrees, and an accurate angle can be obtained. The number in series is not limited to five and can be arbitrarily determined.

(Embodiment 3)
FIG. 17 is a plan view of the energy storage device according to the third embodiment. FIG. 18 is a plan view showing a power storage device in which a plurality of power storage elements according to the third embodiment are stacked.

  The current collector element body serving as the first electrode 11b is cut into a circular shape having a diameter of 50 mm, and the polarizable electrode at the portion to which the lead portion 3 is attached is removed (not shown). In order to ensure the subsequent adhesion with the exterior body, a material sandwiched between sheets of modified PP is used for the drawer 3 (not shown). 11 L of 1st extraction parts are piled up in the place from which the polarizable electrode was removed, and this part is connected by ultrasonic welding. Two of these are prepared as a first electrode 11b and a second electrode 12b.

  A straight line L1 in the direction in which the first lead portion 11L is drawn and a second lead portion through a separator 13 (not shown) obtained by cutting the first electrode 11b and the second electrode 12b into a circular shape having a diameter of 55 mm. It is made to oppose so that the angle (theta) which cross | intersects the straight line L2 of the direction of 12L pull-out may be 30 degree | times, and the electrical storage element 10b is obtained. Eleven power storage elements 10b are prepared and stacked via an insulator 20 (not shown) cut into a circular shape with a diameter of 60 mm. When stacking, the power storage element is rotated 30 degrees so that the second lead portion 12L of the adjacent power storage element 10b and the first lead portion 11L of the adjacent power storage element 10b overlap. By repeating this, 11 power storage elements 10a are stacked to obtain a power storage element assembly 100b as a power storage device.

  Two exterior bodies 21 cut into a circular shape with a diameter of 60 mm are prepared, the power storage element assembly 100b is sandwiched, and a part of the circumference of the exterior body 21 is left and hot-pressed to be sealed. A power storage element assembly 100b (not shown) is obtained. An electrolyte solution (not shown) is put into each power storage element 10b from the remaining circumference of the outer package 21 that is not sealed, and the remaining one side is sealed by hot pressing. A portion where the first lead portion 11L and the second lead portion 12L overlap is connected by ultrasonic welding to form a connection portion W, thereby obtaining a power storage element assembly 100b in which eleven power storage devices 10b are connected in series. Since the electricity storage element assembly 100b is circular, the angles of the first lead portion 11L and the second lead portion 12L can be arbitrarily designed without being affected by the shape of the electricity storage element. The number of series and the angle θ are not limited to this, and can be arbitrarily determined.

(Embodiment 4)
FIG. 19 is a plan view of the energy storage device according to the fourth embodiment. FIG. 20 is a plan view showing a power storage device in which a plurality of power storage elements according to the fourth embodiment are stacked. The current collector body 2 (see FIG. 10-2) is cut into a square shape of 50 mm × 50 mm, and the polarizable electrodes at portions where the lead portions 3 are attached are removed (not shown). In order to ensure the subsequent adhesion with the exterior body, a material sandwiched between sheets of modified PP is used for the drawer 3 (not shown). The lead portion 3 is overlapped at the place where the polarizable electrode is removed, and this portion is connected by ultrasonic welding. Two of these are prepared as a first electrode 11 and a second electrode 12. The first electrode 11 and the second electrode 12 are opposed to each other so that the first extraction portion 11L and the second extraction portion 12L are in a 90-degree direction through a separator 13 cut out in a 54 mm × 54 mm shape. Element 10 is obtained.

  The current collector body 2 is cut into an equilateral triangular shape with a side of 50 mm, and the polarizable electrodes at portions where the lead portions 3 are attached are removed (not shown). In order to ensure the subsequent adhesion with the exterior body, a material sandwiched between sheets of modified PP is used for the drawer 3 (not shown). The lead portion 3 is overlapped at the place where the polarizable electrode is removed, and this portion is connected by ultrasonic welding. Two of these are prepared as a first electrode 11 and a second electrode 12. The first lead portion 11L and the second lead portion 12L are opposed to each other in a 120-degree direction through a separator 13 in which the first electrode 11 and the second electrode 12 are cut into a regular triangle shape having a side of 55 mm. To obtain the electricity storage device 10c.

  The electric storage elements 10 and 10c are stacked via an insulator 20 cut out to 60 mm × 60 mm. When stacking, the storage elements 10 and 10c are overlapped so that the leading portion 12L of the adjacent storage element 10 and the leading portion 11L of the adjacent storage element 10c overlap to obtain the storage element assembly 100c. Two exterior bodies 21 cut out to 60 mm × 60 mm are prepared, the power storage element assembly 100c is sandwiched, and three sides of the exterior body 21 are hot-pressed and sealed to obtain a power storage device before sealing. From the remaining one side of the exterior body 21 that is not sealed, the electrolytic solution is put into the respective power storage elements 10 and 10c, and the remaining one side is sealed by hot pressing. The connecting portion W is connected to the portion where the lead portions 11L and 12L overlap with each other by ultrasonic welding to obtain a power storage device in which the two power storage elements 10 and 10c are connected in series. By having different electrode shapes and lead portions, it is possible to design the lead portions in any direction. The number of series is not limited to this, and can be arbitrarily determined.

(Embodiment 5)
FIG. 21 is a plan view of the energy storage device according to the fifth embodiment. FIG. 22 is a plan view showing a power storage device in which a plurality of power storage elements according to Embodiment 5 are arranged on the same plane. The current collector body 2 is cut into a shape of 50 mm × 50 mm, and the polarizable electrode at the portion to which the lead portion 3 is attached is removed (not shown). In order to ensure the subsequent adhesion with the exterior body, a material sandwiched between sheets of modified PP is used for the drawer 3 (not shown). The lead portion 3 is overlapped at the place where the polarizable electrode is removed, and this portion is connected by ultrasonic welding. Two of these are prepared as a first electrode 11 and a second electrode 12. The first electrode 11 and the second electrode 12 are opposed to each other so that the first extraction portion 11L and the second extraction portion 12L are in a 90-degree direction through a separator 13 cut out in a 54 mm × 54 mm shape. Element 10 is obtained.

  Two exterior bodies 21 cut out to 60 mm × 60 mm are prepared, the power storage element 10 is sandwiched, and the three sides of the exterior body 21 are hot-pressed and sealed to obtain a power storage device before sealing. From the remaining one side of the exterior body 21 that is not sealed, the electrolytic solution is put into the electric storage element 10 and the remaining one side is sealed by hot pressing.

  The current collector body 2 is cut into a shape of 50 mm × 50 mm, and the polarizable electrode at the portion to which the lead portion 3 is attached is removed (not shown). In order to ensure the subsequent adhesion with the exterior body, a material sandwiched between sheets of modified PP is used for the drawer 3 (not shown). The lead portion 3 is overlapped at the place where the polarizable electrode is removed, and this portion is connected by ultrasonic welding. Two of these are prepared as a first electrode 11 and a second electrode 12. The first electrode 11 and the second electrode 12 are opposed to each other so that the first extraction portion 11L and the second extraction portion 12L are in a 180-degree direction through a separator 13 cut out in a 54 mm × 54 mm shape, and 10d is obtained.

  Two exterior bodies 21 cut out to 60 mm × 60 mm are prepared, the power storage element 10 is sandwiched, and the three sides of the exterior body 21 are hot-pressed and sealed to obtain a power storage device before sealing. From the remaining one side of the exterior body 21 that is not sealed, the electrolytic solution ES is put into the electric storage element 10c, and the remaining one side is sealed by hot pressing.

  Three power storage elements 10 and six power storage elements 10d are prepared, nine power storage elements are arranged, and a power storage device 100d in which the overlapping first and second lead portions 11L and 12L are connected by ultrasonic welding is obtained. As a result, the 9 series-connected power storage device 100d can be mounted on the mounting surface with a high mounting efficiency and a small height. The arrangement and number in series are not limited to this, and can be arbitrarily determined.

(Embodiment 6)
FIG. 23 is a plan view of the energy storage device according to the sixth embodiment. FIG. 24 is a plan view showing a power storage device in which a plurality of power storage elements according to Embodiment 6 are arranged on the same plane. The current collector element body to be the first electrode 11a (see FIG. 13) is cut into a regular hexagonal shape with one side of 25 mm, and the polarizable electrode to which the lead portion 3 is attached is removed (not shown). In order to ensure the subsequent adhesion with the exterior body, a material sandwiched between sheets of modified PP is used for the drawer 3 (not shown). 11 L of 1st extraction parts are piled up in the place from which the polarizable electrode was removed, and this part is connected by ultrasonic welding. Two of these are prepared as a first electrode 11a and a second electrode 12a. A straight line L1 in the direction in which the first lead portion 11L is pulled out and a second lead through a separator 13 (not shown) in which the first electrode 11a and the second electrode 12a are cut into a regular hexagonal shape with a side of 30 mm. It is made to oppose so that the angle (theta) which cross | intersects the straight line L2 of the direction where the part 12L is pulled out may be 60 degree | times, 120 degree | times, or 180 degree | times, and electrical storage element 10a, 10a1, 10e is obtained.

  Two exterior bodies 21 cut into a hexagonal shape with one side of 35 mm are prepared, the electricity storage element 10a, 10a1 or 10e is sandwiched, and the 5 sides of the exterior body 21 are hot-pressed and sealed, Get dressed up. From the remaining one side of the exterior body 21 that is not sealed, the electrolytic solution ES is put into the power storage element 10a, 10a1, 10e, and the remaining one side is sealed by hot pressing.

  Four power storage elements 10a, four power storage elements 10a1 and two power storage elements 10e are prepared, and a total of ten power storage elements 10a, 10a1, 10e are arranged, and the first and second lead portions 11L and 12L overlap. Is obtained by ultrasonic welding. As a result, the 10 series-connected power storage devices have a high mounting efficiency with respect to the mounting surface and can have a small height. The arrangement and number in series are not limited to this, and can be arbitrarily determined.

  The invention is not limited to what has been described. The number of electrode sides and the number of leads do not have to be the same, and a cell in which the electrode shape is square and the lead position is rotated by 60 degrees may be combined. Three series of electrodes may be combined by combining cells whose electrode shape is hexagonal and whose lead position is rotated 120 degrees. Further, they may be arranged on the mounting plane without being stacked. In one cell, two or more electrodes may be stacked via a separator.

  As described above, the thin EDLC using the laminate outer package is required to improve the rated voltage. However, there is a limit to the rated voltage of the EDLC, and a method of increasing the rated voltage by connecting in series is used. In the present embodiment, a series connection structure can be easily adopted by designing the cell shape and the lead angle to be adjusted.

DESCRIPTION OF SYMBOLS 1 Current collector 2 Current collector element body 3 Drawer part 10, 10a, 10a1, 10b, 10c, 10d, 10e Power storage element 11, 11a, 11b First electrode 11C First current collector 11L First lead part 11T, 12T Mounting portion 11P, 12P Surface 11S First polarizable electrode 12, 12a, 12b Second electrode 12L Second extraction portion 12T Mounting portion 12C Second current collector 12P Surface 12S Polarized electrode 13 Separator 14A First laminate sheet 14B Second Laminate sheet 14, 21 Exterior body 14SA Internal space 16L, 17L, 18L Terminal 20 Insulator 100, 100 ′, 100 ″, 100d, 100e Power storage device 100a Power storage element assembly 100b, 100c Power storage device 112 before sealing 112 Pad 113 Solder

Claims (9)

A first electrode provided with a first polarizable electrode on the surface of the first current collector;
A second polarizable electrode provided on the surface of the second current collector, the second polarizable electrode facing the first polarizable electrode via a separator;
A first lead part electrically connected to the first current collector and drawn from the first electrode;
When electrically connected to the second current collector and viewed from the direction in which the first polarizable electrode and the second polarizable electrode face each other, the direction in which the first lead portion is drawn out A second lead portion drawn from the second electrode in a direction other than parallel to the second electrode;
A power storage element comprising:   An angle θ between a straight line parallel to the direction in which the first lead portion is drawn from the first electrode and a straight line parallel to the direction in which the second lead portion is drawn from the second electrode is 360 / n degrees ( The electric storage element according to claim 1, wherein n is an integer of 3 or more.   The electric storage element according to claim 2, wherein n is 12 or less.   4. The shape of the first electrode and the second electrode when viewed from the direction in which the first polarizable electrode and the second polarizable electrode face each other is an n-gon or a circle. 5. Power storage element.   5. A power storage device comprising a plurality of the power storage elements according to claim 1, wherein the first lead portion and the second lead portion of the adjacent power storage elements are electrically connected to each other. apparatus. The power storage device according to claim 5, wherein the number D of the plurality of power storage elements is D ≦ ceil ((360−θ) / θ).
ceil (x) represents a ceiling function, and is the smallest integer greater than or equal to x with respect to the real number x.   The shape of at least one of the power storage elements is different from the shape of the other power storage elements when viewed from the direction in which the first polarizable electrode and the second polarizable electrode face each other. The power storage device described in 1.   5. A power storage device comprising: a plurality of power storage elements including at least one power storage element according to claim 1 arranged in the same plane and connected in series. The power storage device according to any one of claims 5 to 8,
While the power storage device is mounted, a substrate having an electrode pad on the surface,
A fixing member that is interposed between the surface of the exterior body and the substrate and fixes both;
A solder material interposed between the electrode pad and the terminal to electrically connect both;
A circuit board comprising:

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