JP2019004099A - Power storage device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electricity storage device having excellent thermal durability. A first external electrode 18 has a first metal cap 18c and a first adhesive layer 18d. The first metal cap 18c covers a portion of the device body 10 on the first end face 10e side. The first adhesive layer 18d adheres the first metal cap 18c to at least one of the main surfaces 10a and 10b and the side surfaces 10c and 10d. The second external electrode 19 has a second metal cap 19c and a second adhesive layer 19d. The second metal cap 19c covers the portion of the device body 10 on the second end face 10f side. The second adhesive layer 19d adheres the second metal cap 19c to at least one of the main surfaces 10a and 10b and the side surfaces 10c and 10d. Each edge of the first and second metal caps 18c, 19c includes a portion whose normal direction is inclined with respect to the length direction L. [Selection diagram] Figure 2

Description

  The present invention relates to an electricity storage device.

  Conventionally, various power storage devices such as electric double layer capacitors and secondary batteries are known. For example, Patent Document 1 describes an example thereof. Patent Document 1 describes an electricity storage device including an external electrode having a metal cap.

International Publication No. 2016/031270

  For example, when the reflow mounting is performed on the power storage device, the temperature may increase. Here, the coefficient of thermal expansion differs between the device body of the electricity storage device and the metal cap. Usually, the thermal expansion coefficient of the metal cap is lower than the thermal expansion coefficient of the device body. For this reason, when the temperature of an electrical storage device rises, there exists a possibility that a metal cap and the internal electrode exposed to the end surface of a device main body may be disconnected. Therefore, there is a demand for an electricity storage device to improve thermal durability.

  A main object of the present invention is to provide an electricity storage device having excellent thermal durability.

  An electricity storage device according to the present invention includes a device body, a first external electrode, and a second external electrode. The device body has first and second main surfaces, first and second side surfaces, and first and second end surfaces. The first and second main surfaces extend along the length direction and the width direction. The first and second side surfaces extend along the length direction and the thickness direction. The first and second end faces extend along the width direction and the thickness direction. The device body has a first internal electrode and a second internal electrode. The first internal electrode is drawn out to the first end face. The second internal electrode is drawn out to the second end face. The first external electrode covers a portion on the first end face side of the device body. The first external electrode is electrically connected to the first internal electrode. The second external electrode covers a portion on the second end face side of the device body. The second external electrode is electrically connected to the second internal electrode. The first external electrode has a first metal cap and a first adhesive layer. The first metal cap covers a portion on the first end face side of the device body. The first adhesive layer adheres the first metal cap to the first and second main surfaces and at least one of the first and second side surfaces. The second external electrode has a second metal cap and a second adhesive layer. The second metal cap covers a portion on the second end face side of the device body. The second adhesive layer adheres the second metal cap to the first and second main surfaces and at least one of the first and second side surfaces. Each edge of the first and second metal caps includes a portion in which the normal direction is inclined with respect to the length direction. For this reason, the length of each edge of the 1st and 2nd metal cap is long. Therefore, the adhesive force in the length direction between the metal cap and the device body is enhanced. Therefore, for example, when the temperature of the electricity storage device rises and the metal cap is about to be displaced outward in the length direction with respect to the device body, the metal cap is difficult to peel from the device body. Therefore, in the electricity storage device according to the present invention, the external electrode and the internal electrode are not easily broken, and excellent thermal durability is realized.

  In the electricity storage device according to the present invention, it is preferable that each end edge of the first and second metal caps includes a wave-like portion.

  In the electricity storage device according to the present invention, a portion located on the first main surface of the edge of the first metal cap, a portion located on the second main surface, and the first side surface It is preferable that the portion located on the second side and the portion located on the second side surface each include a portion inclined with respect to the width direction. A portion located on the first main surface of the edge of the second metal cap, a portion located on the second main surface, a portion located on the first side surface, It is preferable that the portion located on the second side surface includes a portion inclined with respect to the width direction. It is preferable that the first conductive adhesive layer adheres the first metal cap to the first and second main surfaces and the first and second side surfaces. The second conductive adhesive layer preferably adheres the second metal cap to the first and second main surfaces and the first and second side surfaces.

  In the electricity storage device according to the present invention, the first external electrode bonds the first end face and the first metal cap, and electrically connects the first internal electrode and the first metal cap. The first conductive adhesive layer may further be provided. The second external electrode has a second conductive property that bonds the second end face and the second metal cap, and electrically connects the second internal electrode and the second metal cap. It may further have an adhesive layer. In that case, it is preferable that the first and second adhesive layers have lower moisture permeability than the first and second conductive adhesive layers, respectively.

  ADVANTAGE OF THE INVENTION According to this invention, the electrical storage device which has the outstanding thermal durability can be provided.

It is a typical perspective view of the electrical storage device concerning one embodiment of the present invention. It is typical sectional drawing in line II-II of FIG. FIG. 3 is a schematic cross-sectional view taken along line III-III in FIG. 2. It is a schematic plan view of the 1st main surface of the electrical storage device which concerns on one Embodiment of this invention. It is a schematic plan view of the 2nd main surface of the electrical storage device which concerns on one Embodiment of this invention. It is a typical top view of the 1st side of an electrical storage device concerning one embodiment of the present invention. It is a typical top view of the 2nd side of an electrical storage device concerning one embodiment of the present invention.

  Hereinafter, an example of the preferable form which implemented this invention is demonstrated. However, the following embodiment is merely an example. The present invention is not limited to the following embodiments.

  Moreover, in each drawing referred in embodiment etc., the member which has a substantially the same function shall be referred with the same code | symbol. The drawings referred to in the embodiments and the like are schematically described. A ratio of dimensions of an object drawn in a drawing may be different from a ratio of dimensions of an actual object. The dimensional ratio of the object may be different between the drawings. The specific dimensional ratio of the object should be determined in consideration of the following description.

  FIG. 1 is a schematic perspective view of the electricity storage device according to this embodiment. 2 is a schematic cross-sectional view taken along line II-II in FIG. 3 is a schematic cross-sectional view taken along line III-III in FIG.

  The power storage device 1 shown in FIGS. 1 to 3 is, for example, an electric double layer capacitor or a device constituting a secondary battery.

  The power storage device 1 includes a device body 10. As shown in FIGS. 2 and 3, the device main body 10 includes a functional unit 10 </ b> A and an exterior body 10 </ b> B.

  The functional unit 10A is a part that at least partially exhibits a function as a power storage device. The functional unit 10A is provided in a rectangular parallelepiped shape. The functional unit 10A includes first and second main surfaces 10a1 and 10b1, first and second side surfaces 10c1 and 10d1 (see FIG. 3), and first and second end surfaces 10e1 and 10f1 (FIG. 2). For example). The first and second main surfaces 10a1 and 10b1 extend along the length direction L and the width direction W. The first main surface 10a1 and the second main surface 10b1 face each other in the thickness direction T. As shown in FIG. 3, the first and second side surfaces 10 c 1 and 10 d 1 extend along the length direction L and the thickness direction T. The first side surface 10c1 and the second side surface 10d1 face each other in the width direction W. As shown in FIG. 2, the first and second end faces 10 e 1, 10 f 1 extend along the width direction W and the thickness direction T. The first end surface 10e1 and the second end surface 10f1 face each other in the length direction L.

  In the present invention, the “rectangular shape” includes a rectangular shape in which corners and ridges have chamfered shapes or rounded shapes.

  The functional unit 10 </ b> A includes a first internal electrode 11, a second internal electrode 12, and an electrolyte layer 13.

  The first internal electrode 11 extends along the length direction L and the width direction W. The first internal electrode 11 is provided in parallel with the first and second main surfaces 10a1 and 10b1. The first internal electrode 11 is drawn out to the first end face 10e1, but is not drawn out to the first and second side faces 10c1, 10d1 and the second end face 10f1.

  The first internal electrode 11 includes a first current collector 11a and a first active material layer 11b.

  The 1st electrical power collector 11a can be comprised by the metal foil etc. which consist of at least 1 type of metals, such as aluminum and copper, for example.

  In the present invention, “metal” includes an alloy.

  A first active material layer 11b is provided on the surface of one side of the first current collector 11a. The first active material layer 11b includes an active material. When the electricity storage device 1 constitutes an electric double layer capacitor, the first active material layer 11b constitutes a polarizable electrode. When the electricity storage device 1 constitutes an electric double layer capacitor, the first active material layer 11b as a polarizable electrode preferably contains, for example, a carbon material such as activated carbon as an active material.

  The second internal electrode 12 extends along the length direction L and the width direction W. The second internal electrode 12 is provided in parallel with the first and second main surfaces 10a1 and 10b1. The second internal electrode 12 is drawn out to the second end face 10f1, but is not drawn out to the first and second side faces 10c1, 10d1 and the first end face 10e1. The second internal electrode 12 is laminated in the thickness direction T with respect to the first internal electrode 11. The portion of the second internal electrode 12 excluding the end portion on the second end face 10f1 side is opposed to the portion of the first internal electrode 11 excluding the end portion on the first end face 10e1 side in the thickness direction T.

  The second internal electrode 12 includes a second current collector 12a and a second active material layer 12b.

  The 2nd electrical power collector 12a can be comprised with the metal foil which consists of at least 1 type of metals, such as aluminum and copper, for example.

  The second active material layer 12b is provided on the surface of the second current collector 12a on the first internal electrode 11 side. The second active material layer 12b is opposed to the first active material layer 11b in the thickness direction T. The second active material layer 12b includes an active material. When the electricity storage device 1 constitutes an electric double layer capacitor, the second active material layer 12b constitutes a polarizable electrode. When the electricity storage device 1 constitutes an electric double layer capacitor, the second active material layer 12b as the polarizable electrode preferably contains, for example, a carbon material such as activated carbon as an active material.

  An electrolyte layer 13 is provided between the first active material layer 11 b of the first internal electrode 11 and the second active material layer 12 b of the second internal electrode 12. The electrolyte layer 13 is a layer containing an electrolyte. The electrolyte layer 13 may be constituted by a gel electrolyte which is a gel electrolyte, or may be constituted by a porous body such as a separator impregnated with an electrolytic solution. Specific examples of the gel electrolyte include high molecular polyethylene oxide containing an electrolyte.

  Specific examples of the electrolyte include ionic liquids such as EMITFSI (1-ethyl-3-methylimidazolium bis (trifluoromethanesulfonyl) imide), EMIBF4 (1-ethyl-3-methylimidazolium borofluoride), or One of these electrolytes that can be used in which the ionic liquid is dissolved in an organic solvent such as propylene carbonate and acetonitrile may be used, or a mixture of a plurality of types may be used.

  Specifically, in the present embodiment, the electrolyte layer 13 includes a first electrolyte layer 13a and a second electrolyte layer 13b. The first electrolyte layer 13a is provided on the first active material layer 11b. On the other hand, the second electrolyte layer 13b is provided on the second active material layer 12b. The first electrolyte layer 13a and the second electrolyte layer 13b are in contact with each other so that the electrolytes can move relative to each other. The first electrolyte layer 13a and the second electrolyte layer 13b are preferably in close contact with each other.

  Specifically, in the present embodiment, as shown in FIG. 2, only the first current collector 11a of the first internal electrode 11 is exposed to the first end face 10e1. Of the second internal electrode 12, only the second current collector 12a is exposed at the second end face 10f1. The first active material layer 11b of the first internal electrode 11, the second active material layer 12b of the second internal electrode 12, and the electrolyte layer 13 are not exposed to the first and second end faces 10e, 10f. .

  An insulating layer 15 is provided between the first and second active material layers 11b and 12b and the electrolyte layer 13 and each of the first and second end faces 10e1 and 10f1. Specifically, the insulating layer 15 includes a first insulating layer 15a and a second insulating layer 15b. The first active material layer 11b and the first electrolyte layer 13a are isolated from the first and second end faces 10e1 and 10f1 by the first insulating layer 15a. The second active material layer 12b and the second electrolyte layer 13b are isolated from the first and second end faces 10e1 and 10f1 by the second insulating layer 15b.

  As shown in FIG. 3, the insulating layer 15 includes first and second active material layers 11b and 12b, first and second electrolyte layers 13a and 13b, and a first side surface 10c1 and a second side surface 10d1. It is provided to isolate each other. Specifically, the first active material layer 11b and the first electrolyte layer 13a are isolated from the first and second side surfaces 10d1 by the first insulating layer 15a. That is, the first insulating layer 15a covers the first and second end faces 10e1, 10f1 side and the first and second side faces 10c1, 10d1 side of the first active material layer 11b and the first electrolyte layer 13a. It is provided as follows. On the other hand, the second insulating layer 15b isolates the second active material layer 11b and the second electrolyte layer 13b from the first and second side surfaces 10c1 and 10d1. That is, the second insulating layer 15b covers the first and second end faces 10e1, 10f1 side and the first and second side faces 10c1, 10d1 side of the second active material layer 11b and the second electrolyte layer 13b. It is provided as follows.

  The insulating layer 15 can be made of, for example, urethane resin, acrylic resin, epoxy resin, polyimide resin, silicone resin, or the like.

  In the electricity storage device 1 of this embodiment, the pair of first and second internal electrodes 11, 12, the electrolyte layer 13, and the insulating layer 15 constitute one electricity storage unit 17. In the power storage device 1, a plurality of power storage units 17 are stacked, and a stack of the plurality of power storage units 17 constitutes a functional unit 10 </ b> A. In addition, the power storage units 17 adjacent in the stacking direction T are bonded by the adhesive layer 16. In addition, the power storage units 17 positioned in the uppermost layer and the lowermost layer in the stacking direction T are bonded to the inner surface of the exterior body 10B by the adhesive layer 16.

  However, the present invention is not limited to the above configuration. For example, the power storage device according to the present invention may have only one power storage unit. The power storage unit may be configured by a laminate of a plurality of pairs of first and second internal electrodes 11 and 12 that sandwich the electrolyte layer.

  An exterior body 10B is provided outside the functional unit 10A. The exterior body 10B has a function of suppressing intrusion of moisture and the like into the functional unit 10A and a function of suppressing leakage of the electrolytic solution from the functional unit 10A. The exterior body 10B can be composed of, for example, an epoxy resin such as a naphthalene-based epoxy resin, a liquid crystal polymer, or the like.

  The exterior body 10B is provided so as to cover the first and second main surfaces 10a1 and 10b1 and the first and second side surfaces 10c1 and 10d1 of the functional unit 10A. The first and second end faces 10e, 10f of the functional unit 10A are exposed from the exterior body 10B.

  The device body 10 constituted by the exterior body 10B and the functional unit 10A has a rectangular parallelepiped shape. The device body 10 includes first and second main surfaces 10a2 and 10b2 extending along the length direction L and the width direction W, and first and second side surfaces 10c2 extending along the length direction L and the thickness direction T. , 10d2 (see FIG. 3) and first and second end faces 10e2 and 10f2 extending along the width direction W and the thickness direction T. At least a part of the first end face 10e2 is constituted by the first end face 10e1. At least a part of the second end face 10f2 is constituted by the second end face 10f1.

  As shown in FIG. 2, a first external electrode 18 electrically connected to the first internal electrode 11 is provided on the first end faces 10 e 1 and 10 e 2. The first external electrode 18 includes a first electrode film 18a, a first conductive adhesive layer 18b, a first metal cap 18c, and a first adhesive layer 18d.

  A first electrode film 18a is provided on the first end faces 10e1 and 10e2. The first electrode film 18a covers substantially the entire first end faces 10e1 and 10e2.

  The first metal cap 18c covers a portion of the device main body 10 on the first end face 10e1, 10e2 side. Specifically, the first metal cap 18c includes the first end surfaces 10e1 and 10e2, the first main surfaces 10a2 and 10b2, and the first and second side surfaces 10c2 and 10d2. The end surface 10e1, 10e2 side portion is covered. A first conductive adhesive layer 18b is provided between the first metal cap 18c and the first electrode film 18a. The first metal cap 18c and the first electrode film 18a are electrically connected by the first conductive adhesive layer 18b.

  The first metal cap 18c is bonded to the device body 10 by the first adhesive layer 18d. Specifically, the first metal cap 18c is a first adhesive layer with respect to at least one of the first and second main faces 10a2, 10b2 and the first and second side faces 10c2, 10d2 of the device body 10. Bonded by 18d. More specifically, in the present embodiment, the first metal cap 18c is provided for each of the first and second main surfaces 10a2, 10b2 and the first and second side surfaces 10c2, 10d2 of the device body 10. Bonded by the first adhesive layer 18d. The first adhesive layer 18d is at least the ends of the portions of the first metal cap 18c located on the first and second main surfaces 10a2, 10b2 and the first and second side surfaces 10c2, 10d2, respectively. The edge and the device body 10 are bonded. However, in the present invention, the first adhesive layer is not necessarily bonded to the entire end edge portion of the first metal cap and the device body. The first adhesive layer preferably adheres 5% or more of the edge of the first metal cap to the device body, and preferably adheres 50% or more of the device body to the device body. Is more preferable, and it is still more preferable that substantially the entire device body is bonded to the device body.

  A second external electrode 19 that is electrically connected to the second internal electrode 12 is provided on the second end faces 10f1 and 10f2. The second external electrode 19 and the first external electrode 18 cover the exposed portions (first and second end surfaces 10e1, 10f1) of the functional portion 10A from the exterior body 10B. The second external electrode 19 includes a second electrode film 19a, a second conductive adhesive layer 19b, a second metal cap 19c, and a second adhesive layer 19d.

  A second electrode film 19a is provided on the second end faces 10f1 and 10f2. The second electrode film 19a covers substantially the entire second end faces 10f1 and 10f2.

  The second metal cap 19c covers a portion of the device body 10 on the second end face 10f2 side. Specifically, the second metal cap 19c includes the second end face 10f2, the first and second main faces 10a2 and 10b2, and the second end faces 10f2 of the first and second side faces 10c2 and 10d2. Covers the side part. A second conductive adhesive layer 19b is provided between the second metal cap 19c and the second electrode film 19a. By this second conductive adhesive layer 19b, the second metal cap 19c and the second electrode film 19a are electrically connected.

  The second metal cap 19c is adhered to the device body 10 by the second adhesive layer 19d. Specifically, the second metal cap 19c is a second adhesive layer with respect to at least one of the first and second main faces 10a2, 10b2 and the first and second side faces 10c2, 10d2 of the device body 10. Bonded by 19d. More specifically, in the present embodiment, the second metal cap 19c is provided to each of the first and second main surfaces 10a2, 10b2 and the first and second side surfaces 10c2, 10d2 of the device body 10. Bonded by the second adhesive layer 19d. The second adhesive layer 19d is at least the ends of the portions of the second metal cap 19c located on the first and second main faces 10a2, 10b2 and the first and second side faces 10c2, 10d2, respectively. The edge and the device body 10 are bonded. However, in the present invention, it is not always necessary that the second adhesive layer adheres the entire end edge portion of the second metal cap and the device body. The second adhesive layer preferably adheres 50% or more of the edge portion of the second metal cap to the device body, and preferably 5% or more of the device body and the device body. Is more preferable, and it is still more preferable that substantially the entire device body is bonded to the device body.

  Each of the first and second electrode films 18a and 19a is preferably composed of a sprayed film. The first and second electrode films 18a and 19a can be made of, for example, at least one metal selected from the group consisting of Al, Cu, and Al—Si.

  The first and second metal caps 18c and 19c are, for example, a base material containing an alloy (Fe-42Ni alloy), a base material made of aluminum or an aluminum alloy, a base material made of copper or a copper alloy, and the outside of the base material. It can be constituted by Ni / Ag plating or Ni / Au plating covering the surface.

  Incidentally, when the power storage device 1 is reflow-mounted, the temperature of the power storage device 1 may rise. In general, the device body 10 and the metal caps 18c and 19c have different coefficients of thermal expansion. Usually, the thermal expansion coefficient of the metal caps 18 c and 19 c is smaller than the thermal expansion coefficient of the device body 10. For this reason, when the temperature of the electricity storage device 1 rises, the amount of thermal expansion of the metal caps 18 c and 19 c becomes relatively smaller than the amount of thermal expansion of the device body 10, and the metal caps 18 c and 19 c peel from the device body 10. There is a fear.

  Here, in the electricity storage device 1, the end edges 18 </ b> A and 19 </ b> A of the first and second metal caps 18 c and 19 c include portions in which the normal direction is inclined with respect to the length direction L. For this reason, the end edges 18A and 19A of the first and second metal caps 18c and 19c are long. Therefore, the adhesive force in the length direction L between the metal caps 18c and 19c and the device body 10 is enhanced. Therefore, for example, when the temperature of the power storage device 1 rises and the metal caps 18 c and 19 c try to move outside in the length direction L with respect to the device body 10, the metal caps 18 c and 19 c are removed from the device body 10. Hard to peel. Therefore, in the electrical storage device 1, the first external electrode 18 and the first internal electrode 11 are not easily broken. The second external electrode 19 and the second internal electrode 12 are not easily broken. For this reason, the electricity storage device 1 has excellent thermal durability.

  From the viewpoint of more effectively suppressing the peeling between the metal caps 18c and 19c and the device body 10 when the temperature of the electricity storage device 1 rises, the adhesive layers 18d and 19d of the metal caps 18c and 19c are attached to the device body 10 It is preferable that the end edges 18A and 19A bonded to each other have a longer length. Therefore, it is more preferable that the end edges 18A and 19A of the first and second metal caps 18c and 19c include wavy portions.

  In the present invention, the “wavy” means not only a shape in which a uniform curved portion is periodically repeated continuously, such as a sine curve, but also a shape in which random curves are repeatedly repeated irregularly. Shall also be included.

  In addition, from the viewpoint of more effectively suppressing the peeling between the metal caps 18c and 19c and the device body 10 when the temperature of the electricity storage device 1 rises, as shown in FIGS. A portion located on the first main surface 10a2 of the end edge 18A of 18c, a portion located on the second main surface 10b2, and a portion located on the first side surface 10c2. It is preferable that at least two of the portions located on the second side surface 10d2 are provided with portions whose normals are inclined with respect to the length direction L. More preferably, a portion where the normal is inclined with respect to the length direction L is provided. A portion of the edge 19A of the second metal cap 19c located on the first main surface 10a2, a portion located on the second main surface 10b2, and a portion located on the first side surface 10c2. It is preferable that at least two or more portions of the portion and the portion located on the second side surface 10d2 are provided with portions whose normals are inclined with respect to the length direction L. More preferably, all portions are provided with portions whose normals are inclined with respect to the length direction L.

  As described above, in the electricity storage device 1, the end edges 18A and 19A of the first and second metal caps 18c and 19c are respectively provided in a wave shape. For this reason, each of the end edges 18A and 19A has a plurality of portions whose normal directions are different from each other. Therefore, for example, when the power storage device 1 is mounted using solder or the like, the tombstone phenomenon is less likely to occur. Therefore, the electricity storage device 1 can be easily mounted at a desired position in a desired posture.

  In the electricity storage device 1, it is preferable that the first and second adhesive layers 18d and 19d have moisture permeability lower than that of the first and second conductive adhesive layers 18b and 19b, respectively. According to this configuration, moisture can be effectively suppressed from entering the functional unit 10 </ b> A of the electricity storage device 1. From the viewpoint of more effectively suppressing the intrusion of moisture into the functional unit 10A, the first and second adhesive layers 18d and 19d are respectively permeable to moisture through the first and second conductive adhesive layers 18b and 19b. The water permeability is preferably 0.5 times or less of the degree, and more preferably 0.1 times or less.

1: Power storage device 10: Device main body 10A: Functional part 10a1: 1st main surface 10b1: 2nd main surface 10c1: 1st side surface 10d1: 2nd side surface 10e1: 1st end surface 10f1: 2nd end surface 10B: exterior body 10a2: first main surface 10b2: second main surface 10c2: first side surface 10d2: second side surface 10e2: first end surface 10f2: second end surface 11: first internal electrode 11a : First current collector 11b: first active material layer 12: second internal electrode 12a: second current collector 12b: second active material layer 13: electrolyte layer 13a: first electrolyte layer 13b : Second electrolyte layer 15: insulating layer 15a: first insulating layer 15b: second insulating layer 16: adhesive layer 17: power storage unit 18: first external electrode 18a: first electrode film 18b: first Conductive adhesive layer 18c: first Metal cap 18d: first adhesive layer 19: second external electrode 19a: second electrode film 19b: second conductive adhesive layer 19c: second metal cap 19d: second adhesive layer

Claims (4)

First and second main surfaces extending along the length direction and the width direction, first and second side surfaces extending along the length direction and the thickness direction, and first extending along the width direction and the thickness direction A device body having a first internal electrode drawn out to the first end face and a second internal electrode drawn out to the second end face; ,
A first external electrode that covers a portion of the device body on the first end face side and is electrically connected to the first internal electrode;
A second external electrode that covers a portion of the device body on the second end face side and is electrically connected to the second internal electrode;
With
The first external electrode is
A first metal cap that covers a portion of the device body on the first end face side;
A first adhesive layer bonding the first metal cap to the first and second main surfaces and at least one of the first and second side surfaces;
Have
The second external electrode is
A second metal cap that covers a portion of the device body on the second end face side;
A second adhesive layer bonding the second metal cap to the first and second main surfaces and at least one of the first and second side surfaces;
Have
Each edge of the said 1st and 2nd metal cap is an electrical storage device containing the part which the normal line direction inclined with respect to the length direction.   2. The electricity storage device according to claim 1, wherein each edge of the first and second metal caps includes a wave-like portion. A portion of the edge of the first metal cap located on the first major surface, a portion located on the second major surface, and located on the first side surface; And the portion located on the second side surface each include a portion inclined with respect to the width direction,
A portion located on the first main surface of an edge of the second metal cap; a portion located on the second main surface; and a portion located on the first side surface. And the portion located on the second side surface each include a portion inclined with respect to the width direction,
The first conductive adhesive layer bonds the first metal cap, the first and second main surfaces, and the first and second side surfaces, respectively.
The said 2nd electroconductive contact bonding layer has adhere | attached the said 2nd metal cap, the said 1st and 2nd main surface, and each of the said 1st and 2nd side surface. The electricity storage device described. The first external electrode bonds the first end face and the first metal cap, and electrically connects the first internal electrode and the first metal cap. A first conductive adhesive layer;
The second external electrode bonds the second end face and the second metal cap, and electrically connects the second internal electrode and the second metal cap. A second conductive adhesive layer;
4. The electricity storage device according to claim 3, wherein the first and second adhesive layers have moisture permeability lower than that of the first and second conductive adhesive layers, respectively.

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