WO2016031270A1 - Electricity storage device - Google Patents

Abstract

A small electricity storage device is provided. A device main body 10 has electrolyte-containing layers 13a, 13b, 14a, and 14b. A first internal electrode 11 is provided inside of the device main body 10. The first internal electrode 11 is led out to a first end surface 10e. A second internal electrode 12 is provided such that the second internal electrode faces, in the device main body 10, the first internal electrode 11 by having the electrolyte-containing layers 13a, 13b, 14a, and 14b therebetween. The second internal electrode 12 is led out to a second end surface 10f. An exterior body 20 covers first and second main surfaces 10a and 10b, and first and second side surfaces 10c and 10d.

Description

Power storage device

The present invention relates to a power storage device.

Conventionally, various electric storage devices such as electric double layer capacitors and secondary batteries are known. For example, Patent Document 1 describes an example of an electric double layer capacitor. The electric double layer capacitor described in Patent Document 1 has a ceramic container for sealing an element. This is because the element of the electric double layer capacitor is easily deteriorated by oxygen and moisture.

JP 2006-156124 A

There is a desire to miniaturize electrical storage devices such as electric double layer capacitors.

The main object of the present invention is to provide a small power storage device.

The electricity storage device according to the present invention includes a device body, a first internal electrode, a second internal electrode, and an exterior body. 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 an electrolyte-containing layer. The electrolyte-containing layer includes an electrolyte. The first internal electrode is provided in the device body. The first internal electrode is drawn out to the first end face. The second internal electrode is provided in the device main body so as to face the first internal electrode through the electrolyte-containing layer. The second internal electrode is drawn out to the second end face. The exterior body covers the first and second main surfaces and the first and second side surfaces.

Thus, in the electricity storage device according to the present invention, since the exterior body covers the first and second main surfaces and the first and second side surfaces, there is a dead space between the device body and the exterior body. do not do. Therefore, the electricity storage device according to the present invention is small.

The electricity storage device according to the present invention is electrically connected to the first internal electrode, and includes a first external cap having a first metal cap that covers a portion of the first end face and the first end face side of the exterior body. An electrode, and a second external electrode that is electrically connected to the second internal electrode and has a second metal cap that covers the second end surface and a portion of the exterior body on the second end surface side. It is preferable.

In this case, the first and second metal caps can prevent moisture, oxygen, and the like from entering the device body from the first and second end faces. Therefore, the weather resistance of the electricity storage device can be improved.

In the electricity storage device according to the present invention, the first and second metal caps are respectively positioned on the first and second main surfaces of the exterior body, and the first and second side surfaces of the exterior body. It is preferable to cover both the upper part and the part located above.

In this case, it is possible to more effectively suppress moisture, oxygen, and the like from entering the device body from the first and second end faces. Therefore, the weather resistance of the electricity storage device can be further improved.

In the electricity storage device according to the present invention, the first metal cap is any one of the first metal cap main body and the first metal cap main body, the first main surface, the second main surface, and the first and second side surfaces. It is preferable to have a first protrusion extending from the inner surface of the portion provided so as to cover the cover to the exterior body toward the first end face. The second metal cap is provided so as to cover one of the second metal cap main body and the second metal cap main body, the first and second main surfaces, and the first and second side surfaces. It is preferable to have the 2nd protrusion part extended to an exterior body from the inner surface of a part toward the 2nd end surface side.

In this case, the bonding strength between the first and second metal caps and the device body can be improved.

In the electricity storage device according to the present invention, it is preferable that the first and second metal caps each have a metal cap body made of Fe—Ni alloy, Cu—Zn alloy, Cu—Zn—Ni alloy or Al.

In the electricity storage device according to the present invention, it is preferable that the first and second metal caps are respectively provided on the surface of the metal cap main body and further have a coating layer containing Ag, Au, or Sn.

In the electricity storage device according to the present invention, it is preferable that the first and second metal caps each further include a Ni layer provided between the coating layer and the metal cap body so as to be in contact with the coating layer.

In the electricity storage device according to the present invention, the first external electrode is provided on the first end face, and the first internal electrode and the first metal cap are electrically connected to each other. The second thermal spraying further includes a thermal spraying film, the second external electrode is provided on the second end face, and electrically connects the second internal electrode and the second metal cap. It is preferable to further have a film.

In the electricity storage device according to the present invention, the first external electrode further includes a first conductive film connecting the first sprayed film and the first metal cap, and the second external electrode includes the first external electrode, It is preferable to further have a second conductive film that connects the second sprayed film and the second metal cap.

In the electricity storage device according to the present invention, it is preferable that the first and second conductive films are each composed of a conductive adhesive layer including a resin and conductive particles dispersed in the resin.

In the electricity storage device according to the present invention, the electrolyte-containing layer may be composed of a gel.

In the electricity storage device according to the present invention, the electrolyte-containing layer may contain an ionic liquid. Here, “ionic liquid” refers to a liquid salt having a melting point of 100 ° C. or lower.

According to the present invention, a small power storage device can be provided.

FIG. 1 is a schematic perspective view of the electricity storage device according to the first embodiment. FIG. 2 is a schematic cross-sectional view taken along line II-II in FIG. FIG. 3 is a schematic cross-sectional view of a portion III in FIG. FIG. 4 is a schematic front view of the device body and the exterior body in the first embodiment. FIG. 5 is a schematic perspective view for explaining a manufacturing process of the electricity storage device according to the first embodiment. FIG. 6 is a schematic perspective view for explaining a manufacturing process of the electricity storage device in the first embodiment. FIG. 7 is a schematic plan view for explaining a manufacturing process of the electricity storage device in the first embodiment. FIG. 8 is a schematic plan view for explaining a manufacturing process of the electricity storage device according to the first embodiment. FIG. 9 is a schematic cross-sectional view of the electricity storage device according to the second embodiment. FIG. 10 is a schematic perspective view of a metal cap in the third embodiment.

Hereinafter, an example of a preferable embodiment in which the present invention is implemented will be described. However, the following embodiment is merely an example. The present invention is not limited to the following embodiments.

In each drawing referred to in the embodiment and the like, members having substantially the same function are referred to by the same reference numerals. The drawings referred to in the embodiments and the like are schematically described, and the ratio of the dimensions of the objects drawn in the drawings may be different from the ratio of the dimensions of the actual objects. 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.

(First embodiment)
FIG. 1 is a schematic perspective view of the electricity storage device according to this embodiment. FIG. 2 is a schematic cross-sectional view taken along line II-II in FIG. FIG. 3 is a schematic cross-sectional view of a portion III in FIG. FIG. 4 is a schematic front view of the device body and the exterior body in the first embodiment.

(Configuration of power storage device 1)
The power storage device 1 shown in FIGS. 1 to 4 is, for example, an electric double layer capacitor or a device constituting a secondary battery.

The electricity storage device 1 includes a device body 10. The device body 10 has first and second main surfaces 10a and 10b, first and second side surfaces 10c and 10d, and first and second end surfaces 10e and 10f. The first and second main surfaces 10a and 10b extend along the length direction L and the width direction W, respectively. The first main surface 10a and the second main surface 10b face each other in the thickness direction T. The first and second side surfaces 10c and 10d extend along the length direction L and the thickness direction T, respectively. The first side surface 10c and the second side surface 10d face each other in the width direction W. Part of each of the first and second end faces 10e, 10f extends along the width direction W and the thickness direction T. The first end surface 10e and the second end surface 10f face each other in the length direction L. In the present embodiment, the device body 10 has a substantially rectangular parallelepiped shape.

As shown in FIG. 2, the first end face 10e has a first portion 10e1 and a second portion 10e2. The first portion 10 e 1 extends along the width direction W and the thickness direction T. The second portion 10e2 is located outside the first portion 10e1. The second portion 10e2 connects the first portion 10e1, the first and second main surfaces 10a and 10b, and the first and second side surfaces 10c and 10d. The second portion 10e2 is inclined with respect to the first portion 10e1. Specifically, the second portion 10e2 extends toward the center in the length direction L of the device body 10 as it goes outward from the first portion 10e1 side.

As shown in FIG. 2, the second end surface 10f also has a third portion 10f1 and a fourth portion 10f2 in the same manner as the first end surface 10e. The third portion 10f1 extends along the width direction W and the thickness direction T. The fourth portion 10f2 is located outside the third portion 10f1. The fourth portion 10f2 connects the third portion 10e1, the first and second main surfaces 10a and 10b, and the first and second side surfaces 10c and 10d. The fourth portion 10f2 is inclined with respect to the third portion 10f1. Specifically, the fourth portion 10f2 extends toward the center side in the length direction L of the device body 10 as it goes outward from the third portion 10f1 side.

As shown in FIG. 2, the device body 10 has a plurality of first internal electrodes 11 and a plurality of second internal electrodes 12. The first and second internal electrodes 11 and 12 are alternately provided along the thickness direction T.

The first internal electrode 11 is provided in parallel with the first and second main surfaces 10a and 10b. At least a part of the first internal electrode 11 is drawn out to the first end face 10e. The first internal electrode 11 is not drawn out to the second end face 10f and the first and second side faces 10c, 10d.

The first internal electrode 11 has a first current collector 11a and first active material layers 11b and 11c. The first active material layers 11b and 11c are provided on at least one of the first current collectors 11a. In the present embodiment, first active material layers 11b and 11c are provided on both surfaces of the first current collector 11a.

The first current collector 11a can be made of a metal foil made of at least one metal such as aluminum or copper.

The first active material layers 11b and 11c are members constituting a polarizable electrode when the electricity storage device 1 constitutes an electric double layer capacitor. In this case, it is preferable that the first active material layers 11b and 11c include a carbon material such as activated carbon.

The second internal electrode 12 is provided in parallel with the first and second main surfaces 10a and 10b. At least a part of the second internal electrode 12 is drawn out to the second end face 10f. The second internal electrode 12 is not drawn out to the first end face 10e and the first and second side faces 10c, 10d.

The second internal electrode 12 has a second current collector 12a and second active material layers 12b and 12c. The second active material layers 12b and 12c are provided on the surface of at least one side of the second current collector 12a. In the present embodiment, second active material layers 12b and 12c are provided on both surfaces of the second current collector 12a.

The second current collector 12a can be made of a metal foil made of at least one metal such as aluminum or copper.

The second active material layers 12b and 12c are members constituting polarizable electrodes when the electricity storage device 1 constitutes an electric double layer capacitor. In this case, it is preferable that the second active material layers 12b and 12c include a carbon material such as activated carbon.

The first electrolyte containing layer 13a is provided on the first active material layer 11b. A first electrolyte-containing layer 13b is provided on the first active material layer 11c. The first electrolyte containing layers 13 a and 13 b are provided on the first internal electrode 11. The first electrolyte-containing layers 13a and 13b are provided separately from the second end face 10f. A second electrolyte-containing layer 13c is provided on the second active material layer 12b. A second electrolyte-containing layer 13d is provided on the second active material layer 12c. The second electrolyte containing layers 13 c and 13 d are provided on the second internal electrode 12. The second electrolyte-containing layers 13c and 13d are provided separately from the first end face 10e.

Note that the first electrolyte-containing layer and the second electrolyte-containing layer may be provided integrally. That is, the first electrolyte-containing layer and the second electrolyte-containing layer that are adjacent to each other may be provided integrally.

The electrolyte containing layers 13a, 13b, 13c, and 13d each contain an electrolyte. The electrolyte-containing layers 13a, 13b, 13c, and 13d are each preferably composed of a gel containing an electrolyte. By adopting the gel electrolyte, it is possible to suppress leakage and evaporation of the electrolyte, and to reduce the resistance of the electrode and the electrolyte interface. In addition, there is an effect that a separator is not required and the element can be reduced in weight and thickness. As the gel, for example, a high molecular polyethylene oxide resin or the like can be used. In addition, each of the electrolyte containing layers 13a, 13b, 13c, and 13d may contain an ionic liquid. By containing the ionic liquid in the electrolyte-containing layers 13a, 13b, 13c, and 13d, an effect that the reaction between the first internal electrode 11 and the like caused by moisture and the nonaqueous electrolytic solution can be suppressed is achieved. . Specific examples of the ionic liquid preferably used include, for example, a quaternary ammonium ion having a structure in which an alkyl group or an alkoxyalkyl group is bonded to a nitrogen atom as a cation, and an alkyl group or an alkoxyalkyl group bonded to the nitrogen atom. A pyrrolidinium ion having a structure, and an imidazo having a structure in which an alkyl group or an alkoxyalkyl group is bonded to two nitrogen atoms, respectively, and a hydrogen group or an alkyl group is bonded to a carbon atom (C) between the two nitrogen atoms What contains any 1 type or 2 types or more, such as a lithium ion, is mentioned. Specific examples of the ionic liquid preferably used include, for example, BF ₄ ⁻ , PF ₆ ⁻ , AsF ₆ ⁻ , SbF ₆ ⁻ , NbF ₆ ⁻ , TaF ₆ ⁻ , CG ₃ SO ₃ ⁻ and CF ₃ as anions. SO ₃ ⁻ , C ₄ F ₉ SO ₃ ⁻ , (CF ₃ CO) (CF ₃ SO ₂ ) N ⁻ , (FSO ₂ ) ₂ N ⁻ , (FSO ₂ ) (CF ₃ SO ₂ ) N ⁻ , (CF _{3 SO 2) 2 N-, (CF} 3 SO 2) (C 2 F 5 SO 2) N -, (C 2 F 5 SO 2) 2 N-, (CF 3 SO 2) 3 C -, (CN) 4 ^{_{B -, CF 3 BF 3 -}} , C 2 F 5 BF 3 -, C 3 F 7 BF 3 - include those containing one, or two or more of such. The ionic liquid is, for example, a combination of at least one kind of the cation and at least one kind of the anion so as to be liquid at room temperature. Specific examples of the ionic liquid include, for example, 1-ethyl-3-methylimidazolium tetrafluoroborate (EMIBF ₄ ), 1-ethyl-3-methylimidazolium hexafluorophosphate (EMIPF ₆ ), 1-ethyl-3- Methylimidazolium bis (trifluoromethanesulfonyl) imide (EMITFSI), 1-ethyl-3-methylimidazolium trifluoromethaneacetonate (EMITfAc), 1-ethyl-3-methylimidazolium trifluoromethanesulfonate (EMICF ₃ SO ₃ ) And trimethylbutylammonium bis (trifluoromethanesulfonyl) imide (TMBNTFSI).

The first active material layer 11b and the second active material layer 12c are opposed to each other via the first electrolyte-containing layer 13a and the second electrolyte-containing layer 13d. The first active material layer 11c and the second active material layer 12b are opposed to each other via the first electrolyte-containing layer 13b and the second electrolyte-containing layer 13c.

The first and second main surfaces 10a and 10b and the first and second side surfaces 10c and 10d of the device body 10 are covered with an exterior body 20. The exterior body 20 and the device body 10 are in close contact with each other. That is, there is substantially no space between the exterior body 20 and the device body 10. As shown in FIGS. 2 and 4, the exterior body 20 includes first to fourth portions 20a, 20b, 20c, and 20d. As shown in FIG. 2, the first portion 20a covers the first main surface 10a. The second portion 20b covers the second main surface 10b. As shown in FIG. 4, the third portion 20c covers the first side surface 10c. The fourth portion 20d covers the second side surface 10d.

The exterior body 20 can be comprised by various polymers, such as a liquid crystal polymer, for example.

The first external electrode 18 is provided on the first end face 10e. The first external electrode 18 is electrically connected to the first internal electrode 11. The first external electrode 18 covers the first end surface 10e and the portion of the exterior body 20 on the first end surface 10e side.

The first external electrode 18 has a first sprayed film 18a, a first conductive film 18b, and a first metal cap 18c. The first sprayed film 18a is provided on the first end face 10e. The first end face 10e is covered with a first sprayed film 18a. The first sprayed film 18 a is connected to the first internal electrode 11. By providing the first sprayed film 18a, an effect that the electric resistance value of the first external electrode 18 can be lowered is exhibited.

The first metal cap 18c covers the first end face 10e via the first conductive film 18b, and covers the portion of the exterior body 20 on the first end face 10e side. The first metal cap 18c has first to fifth portions 18c1 to 18c5. The first portion 18c1 is located on the first end face 10e. The second portion 18c2 is connected to the first portion 18c1. The second portion 18c2 is located on the first main surface 10a. The third portion 18c3 is connected to the first portion 18c1. The third portion 18c3 is located on the second main surface 10b. The fourth portion 18c4 is connected to the first portion 18c1 and the second portion 18c2. The fourth portion 18c4 covers the first side surface 10c. The fifth portion 18c5 is connected to the first portion 18c1 and the second portion 18c2. The fifth portion 18c5 covers the second side surface 10d.

The first metal cap 18c is electrically connected to and adhered to the first sprayed film 18a by the first conductive film 18b. Therefore, the first metal cap 18 c is electrically connected to the first internal electrode 11.

A second external electrode 19 is provided on the second end face 10f. The second external electrode 19 is electrically connected to the second internal electrode 12. The second external electrode 18 covers the second end face 10f and the portion of the exterior body 20 on the second end face 10f side.

The second external electrode 19 includes a second sprayed film 19a, a second conductive film 19b, and a second metal cap 19c. The second sprayed film 19a is provided on the second end face 10f. The second end face 10f is covered with a second sprayed film 19a. The second sprayed film 19 a is connected to the second internal electrode 12. By providing the second sprayed film 19a, there is an effect that the electric resistance value of the second external electrode 19 can be lowered.

The second metal cap 19c covers the second end face 10f via the second conductive film 19b, and covers the portion of the exterior body 20 on the second end face 10f side. The second metal cap 19c has first to fifth portions 19c1 to 19c5. The first portion 19c1 is located on the second end face 10f. The second portion 19c2 is connected to the first portion 19c1. The second portion 19c2 is located on the first main surface 10a. The third portion 19c3 is connected to the first portion 19c1. The third portion 19c3 is located on the second main surface 10b. The fourth portion 19c4 is connected to the first portion 19c1 and the second portion 19c2. The fourth portion 19c4 covers the first side surface 10c. The fifth portion 19c5 is connected to the first portion 19c1 and the second portion 19c2. The fifth portion 19c5 covers the second side surface 10d.

The second metal cap 19c is electrically connected to and adhered to the second sprayed film 19a by the second conductive film 19b. Therefore, the second metal cap 19 c is electrically connected to the second internal electrode 12.

The first and second sprayed films 18a and 19a can be made of, for example, Al or an Al alloy. In the present embodiment, the first and second sprayed films 18a and 19a are composed of a porous body such as Al or an Al alloy and a sealing agent filled in the pores of the porous body. Specific examples of the sealant preferably used include curable resins such as epoxy resin, phenol resin, silicon resin, polyimide resin, and acrylic resin, and these may be used alone or in combination of two or more. Is possible.

The first and second conductive films 18a and 19a can be composed of, for example, a conductive adhesive layer. Here, the “conductive adhesive layer” is composed of a resin and conductive particles dispersed in the resin. The conductive adhesive layer has a function of electrically connecting and a function of bonding. Examples of the resin of the conductive adhesive layer that is preferably used include an epoxy resin, a phenolic tree species, a silicon resin, a polyimide resin, and an acrylic resin, and these can be used alone or in combination of two or more. Examples of the conductive particles of the conductive adhesive preferably used include gold, silver, copper, nickel, aluminum, and carbon.

The first and second metal caps 18c and 19c can be made of various metals and alloys, for example. In the present embodiment, the first and second metal caps 18 c and 19 c have a metal cap body 21, a Ni layer 22, and a coating layer 23. The metal cap body 21 can be made of, for example, an Fe—Ni alloy, a Cu—Zn alloy, a Cu—Zn—Ni alloy, Al, or the like. By configuring the metal cap body 21 with these materials, it is possible to improve the strength of the metal caps 18c and 19c themselves and the solderability of the metal caps 18c and 19c.

A coating layer 23 is provided on the metal cap body 21. In the present embodiment, substantially the entire surface of the metal cap body 21 is covered with the coating layer 23. The coating layer 23 can be made of, for example, Ag, Au, Sn, or an alloy containing at least one of them. By comprising the coating layer 23 with these materials, the effect that the solderability of the metal caps 18c and 19c can be improved is exhibited. The coating layer 23 may be composed of a stacked body of a plurality of layers, for example. The coating layer 23 may be composed of a plating layer.

A Ni layer 22 is provided between the coating layer 23 and the metal cap body 21 so as to be in contact with the coating layer 23. By providing the Ni layer 22, the effect that the solderability of the metal caps 18c and 19c can be improved is exhibited. The Ni layer is made of Ni or Ni alloy. The Ni layer 22 may be composed of a plating layer.

The electricity storage device 1 is provided with first isolation layers 14a and 14b that isolate the first electrolyte-containing layers 13a and 13b and the first end face 10e. Second isolation layers 15a and 15b are provided to isolate the second electrolyte-containing layers 13c and 13d from the second end face 10f. Since these isolation layers 14a, 14b, 15a, and 15b are provided, the electrolyte contained in the electrolyte-containing layers 13a, 13b, 13c, and 13d is unlikely to leak from the end faces 10e and 10f. Therefore, the electricity storage device 1 has excellent reliability.

Further, in the electricity storage device 1, third isolation layers 16a and 16b that isolate the first electrolyte-containing layers 13a and 13b and the second end face 10f are provided. Fourth isolation layers 17a and 17b for isolating the second electrolyte-containing layers 13c and 13d and the first end face 10e are provided. Since these isolation layers 16a, 16b, 17a, and 17b are provided, the electrolyte contained in the electrolyte containing layers 13a, 13b, 13c, and 13d is unlikely to leak from the end faces 10e and 10f. Therefore, the electricity storage device 1 has more excellent reliability.

The isolation layers 14a, 14b, 15a, 15b, 16a, 16b, 17a, and 17b are preferably made of a material that does not allow electrolyte to permeate. The isolation layers 14a, 14b, 15a, 15b, 16a, 16b, 17a, and 17b are preferably constituted by, for example, a resin layer. The isolation layers 14a, 14b, 15a, 15b, 16a, 16b, 17a, and 17b are preferably made of a resin composition containing, for example, an acrylic resin and a filler such as silica.

By the way, for example, when a ceramic container for sealing an element like the electric double layer capacitor described in Patent Document 1 is provided, a dead space is generated between the ceramic container and the element. For this reason, electric double layer capacitors tend to increase in size. On the other hand, in the electrical storage device 1, the exterior body 20 which covers the 1st and 2nd main surfaces 10a and 10b of the device main body 10, and the 1st and 2nd side surfaces 10c and 10d is provided. The exterior body 20 prevents oxygen, moisture, and the like from entering the device body 10. Further, the device body 10 is covered with the exterior body 20, and there is substantially no gap between the device body 10 and the exterior body 20. For this reason, the electrical storage device 1 is small. As described above, since the exterior body 20 that covers the first and second main surfaces 10a and 10b and the first and second side surfaces 10c and 10d of the device body 10 is provided, the power storage device 1 is excellent. It has a small size while having excellent weather resistance.

The power storage device 1 is provided with a first metal cap 18c that covers the first end surface 10e and the portion of the exterior body 20 on the first end surface 10e side. A second metal cap 19c that covers the second end surface 10f and the portion of the exterior body 20 on the second end surface 10f side is provided. By these metal caps 18c and 19c, the penetration of moisture and oxygen into the device body 10 is more effectively suppressed. In particular, in the present embodiment, the metal caps 18c and 19c are provided on the portions 18c1, 18c2, 19c1 and 19c2 covering the first and second main surfaces 10a and 10b, and on the first and second side surfaces 10c and 10d. 18c3, 18c4, 19c3, 19c4. For this reason, the penetration | invasion of the water | moisture content and oxygen in the device main body 10 is suppressed more effectively.

(Method for manufacturing power storage device 1)
Hereinafter, an example of a method for manufacturing the electricity storage device 1 will be described with reference to FIGS.

First, a base material for forming a plurality of device bodies 10 is manufactured. The base material can be manufactured by a known method. The base material 31 (see FIG. 5) is produced by cutting the base material into strips. The strip-shaped base material 31 has a plurality of portions for constituting the device body 10 along the longitudinal direction.

Next, as shown in FIG. 5, the strip base material 31 is disposed in each of the plurality of linear recesses 32 a of the first exterior body base material 32. Next, as shown in FIG. 6, the base material 34 is manufactured by covering the second exterior body base material 33 on the first exterior body member 32 and bonding them. The first and second exterior body base materials 32 and 33 are members for configuring the exterior body 20.

Next, the base material 34 is divided into a plurality along the cut line CL. Thereby, the device main body 10 covered with the exterior body 20 shown in FIG. 7 is produced. You may perform a roughening process with respect to the end surface of the device main body 10 covered with this exterior body 20. FIG. Next, the ridge line part of the end surface of the device body 10 covered with the exterior body 20 is chamfered to form second portions 10e1 and 10f2.

Next, thermal spraying is performed on the end surface of the device body 10 covered with the exterior body 20 by using a thermal spray gun. Then, after making it dry, the obtained chip | tip is immersed in the solution containing a sealing agent. Thereby, the 1st sprayed film 18a (refer FIG. 8) and the 2nd sprayed film 19a are formed. Next, by cleaning the chip, the sprayed metal particles are exposed on the surfaces of the sprayed films 18a and 19a.

Next, conductive films 18b and 19b are formed by applying a conductive paste on the sprayed films 18a and 19a and drying. Finally, the electricity storage device 1 can be completed by inserting a chip into the metal caps 18c and 19c.

Hereinafter, another example of the preferred embodiment of the present invention will be described. In the following description, members having substantially the same functions as those of the first embodiment are referred to by the same reference numerals, and description thereof is omitted.

(Second Embodiment)
FIG. 9 is a schematic cross-sectional view of an electricity storage device 1a according to the second embodiment. The power storage device 1a shown in FIG. 9 has substantially the same configuration as the power storage device 1 according to the first embodiment except for the metal caps 18c and 19c.

The first metal cap 18c includes a first metal cap body 18c6 and first protrusions 18c7 and 18c8. The first protrusion 18c7 extends from the inner surface of the portion provided to cover the first main surface 10a of the first metal cap 18c6 toward the first end surface 10e. The first protrusion 18c7 reaches the exterior body 20. The second protrusion 18c8 extends from the inner surface of the portion provided to cover the second main surface 10b of the first metal cap 18c6 toward the first end surface 10e. The first protrusion 18c8 reaches the exterior body 20. The first metal cap 18c is locked to the exterior body 20 by the first protrusions 18c7 and 18c8. Therefore, the bonding strength between the first metal cap 18c and the exterior body 20 can be increased.

The second metal cap 19c has a second metal cap body 19c6 and second protrusions 19c7 and 19c8. The second protrusion 19c7 extends from the inner surface of the portion provided to cover the first main surface 10a of the second metal cap 19c6 toward the second end surface 10f. The second protrusion 19c7 reaches the exterior body 20. The second protrusion 19c8 extends from the inner surface of the portion provided to cover the second main surface 10b of the second metal cap 19c6 toward the second end surface 10f. The second protrusion 19c8 reaches the exterior body 20. The second metal cap 19c is locked to the exterior body 20 by the second protrusions 19c7 and 19c8. Accordingly, the bonding strength between the second metal cap 19c and the outer package 20 can be increased.

(Third embodiment)
FIG. 10 is a schematic perspective view of a metal cap in the third embodiment.

In the first embodiment, each of the first and second metal caps 18c and 19c includes a part of each of the first and second main surfaces 10a and 10b, and the first and second side surfaces 10c and 10d. The example which covers both of each part of was demonstrated. However, the present invention is not limited to this. For example, as shown in FIG. 10, a metal cap 40 having a U-shaped cross section may be used. In this case, the metal cap 40 covers the first and second main surfaces 10a and 10b or the first and second side surfaces 10c and 10d.

1,1a Power storage device 10 Device body 10a First main surface 10b Second main surface 10c First side surface 10d Second side surface 10e First end surface 10f Second end surface 11 First internal electrode 11a First Current collectors 11b, 11c First active material layer 12 Second internal electrode 12a Second current collectors 12b, 12c Second active material layers 13a, 13b First electrolyte-containing layers 13c, 13d Second electrolyte Contained Layer 18 First External Electrode 18a First Thermal Spray Film 18b First Conductive Film 18c First Metal Cap 18c6 First Metal Cap Body 18c7, 18c8 First Protrusion 19 Second External Electrode 19a Second Thermal spray film 19b Second conductive film 19c Second metal cap 19c6 Second metal cap body 19c7, 19c8 Second protrusion 20 Exterior body 21 Metal cap body 22 Ni layer 23 Computing layer 31 rectangular preform 32 first exterior member 32a linear recess 33 second external housing preform 34 matrix

Claims (12)

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 And a device body having an electrolyte-containing layer including an electrolyte, and a second end surface;
A first internal electrode provided in the device body and led out to the first end face;
In the device body, the second internal electrode provided to face the first internal electrode through the electrolyte-containing layer, and drawn to the second end surface;
An exterior body covering the first and second main surfaces and the first and second side surfaces;
An electricity storage device comprising: A first external electrode that is electrically connected to the first internal electrode and has a first metal cap that covers the first end surface and a portion of the exterior body on the first end surface side;
A second external electrode that is electrically connected to the second internal electrode and has a second metal cap that covers the second end surface and a portion of the exterior body on the second end surface side;
The electricity storage device according to claim 1, further comprising: The first and second metal caps are respectively positioned on the first and second main surfaces of the exterior body and on the first and second side surfaces of the exterior body. The electricity storage device according to claim 2, which covers both of the portions to be connected. The first metal cap covers either the first metal cap main body or the first metal cap main body and the first and second main surfaces and the first and second side surfaces of the first metal cap main body. A first protrusion extending from the inner surface of the portion provided to the exterior body toward the first end face,
The second metal cap covers the second metal cap main body and the first metal second main surface and the first and second side surfaces of the second metal cap main body. The power storage device according to claim 2, further comprising a second protrusion extending from the inner surface of the provided portion to the exterior body toward the second end face. The first and second metal caps each have a metal cap body made of Fe-Ni alloy, Cu-Zn alloy, Cu-Zn-Ni alloy, or Al, respectively. The electricity storage device described. The electricity storage device according to claim 5, wherein each of the first and second metal caps is provided on a surface of the metal cap body, and further includes a coating layer containing Ag, Au, or Sn. The electricity storage according to claim 6, wherein each of the first and second metal caps further includes a Ni layer provided between the coating layer and the metal cap main body so as to be in contact with the coating layer. device. The first external electrode is provided on the first end face, and further includes a first sprayed film that electrically connects the first internal electrode and the first metal cap. Have
The second external electrode is provided on the second end surface, and further includes a second sprayed film that electrically connects the second internal electrode and the second metal cap. The electricity storage device according to any one of claims 2 to 7, comprising: The first external electrode further includes a first conductive film connecting the first sprayed film and the first metal cap,
The power storage device according to claim 8, wherein the second external electrode further includes a second conductive film that connects the second sprayed film and the second metal cap. 10. The electricity storage device according to claim 9, wherein each of the first and second conductive films is composed of a conductive adhesive layer including a resin and conductive particles dispersed in the resin. The electricity storage device according to any one of claims 1 to 10, wherein the electrolyte-containing layer is made of a gel. The electricity storage device according to any one of claims 1 to 10, wherein the electrolyte-containing layer contains an ionic liquid.

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