JP7196827B2 - circuit device - Google Patents

Description

This specification discloses an electrical storage device and a circuit arrangement.

Conventionally, as a circuit device equipped with a power storage device, there are first and second common mode cores connected to a LISN in parallel with a battery power supply, a normal mode core and a switching power supply connected thereto, and between this power supply and the normal mode core. The switching power supply housing is wired between the first and second capacitors and the housing is grounded, and L and C of each circuit satisfy a predetermined formula. A proposal has been made that satisfies this requirement (see, for example, Patent Document 1). In this circuit device, it is possible to keep the noise within the noise limits specified in the international standard CISPR25 in the switching power supply for electrical equipment for automobiles.

JP 2008-79386 A

However, in the circuit device of Patent Document 1, capacitors and coils are arranged in the circuit as means for reducing noise, but these configurations are not essential if noise reduction is achieved. Thus, there has been a demand for further simplification of the configuration of the circuit device.

The present disclosure has been made in view of such problems, and a main object thereof is to provide an electricity storage device and a circuit device that can further simplify the circuit configuration.

As a result of intensive research to achieve the above-described object, the present inventors have found that by configuring the power storage device in a columnar shape and forming it into a coil shape, the coil for noise reduction as another configuration is omitted. We have found that it is possible, and have completed the invention disclosed in this specification.

That is, the electricity storage device disclosed in this specification is
a columnar first electrode having a first active material and including fibrous;
a separation membrane having ionic conductivity and insulation and covering the first electrode;
a second electrode formed on the separation membrane and having a second active material;
The outer shape is formed in a coil shape.

A circuit device disclosed in the present specification includes the power storage device described above.

The present disclosure allows for a simpler circuit configuration. The reason why such effects are obtained will be described below, for example. In general, a circuit using a power storage device such as a secondary battery may have a problem of noise generation. There are various causes of noise, but when attenuating high-frequency components, it is common to include an element that functions as a low-pass filter in the circuit. Low-pass filters include a method in which an inductor (coil) is inserted in series and a method in which a capacitor is inserted across the noise source. In the present disclosure, by forming the power storage device arranged in series in the circuit into a coil shape, the device itself has an inductor component, and noise equivalent to a low-pass filter is arranged without a coil as a low-pass filter. allow reduction. In this way, the power storage device, which is a power supply, has a coil shape that is useful for noise reduction, and the circuit device can omit the coil for noise reduction. Therefore, the present disclosure can further simplify the circuit configuration.

FIG. 2 is a schematic diagram showing an example of a circuit device 10 including an electricity storage device 20; FIG. 2 is a schematic diagram showing an example of a circuit device 10B including an electricity storage device 20B; The schematic diagram which shows an example of 10 C of circuit apparatuses provided with 20 C of electrical storage devices. FIG. 2 is a schematic diagram showing an example of a conventional circuit device 110 and a circuit device 210;

(circuit device)
Embodiments of a circuit device and an electricity storage device according to the present disclosure will be described below with reference to the drawings. FIG. 1 is a schematic diagram showing an example of a circuit device 10 and an electricity storage device 20. As shown in FIG. FIG. 2 is a schematic diagram showing an example of a circuit device 10B having an electricity storage device 20B with a fiber bundle 21B. FIG. 3 is a schematic diagram showing an example of a circuit device 10C including an electricity storage device 20C made up of a cell bundle 21C. FIG. 4 is a schematic diagram showing an example of a conventional circuit device 110 having a coil 130 and a conventional circuit device 210 having a capacitor 230. As shown in FIG.

The circuit device 10 includes a load 12 , a noise source 15 and an electricity storage device 20 . The load 12 is operated by electric power supplied from the power storage device 20, and includes, for example, a driving section and an element. Examples of driving units include synchronous motors, induction motors, and stepping motors. Examples of elements include semiconductor elements, piezoelectric elements, optical elements, thermoelectric elements, and the like. The noise source 15 generates noise when the circuit device 10 operates.

The power storage device 20 is a power supply for the circuit device 10 and also has a function of reducing noise from the noise source 15 . The electricity storage device 20 includes a columnar first electrode 21 having a first active material, a separation film 24 having ion conductivity and insulation and covering the first electrode 21 , and a second electrode 24 formed on the separation film 24 . a second electrode 22 comprising an active material. In this electric storage device 20, the first electrode 21 is preferably the negative electrode and the second electrode 22 is preferably the positive electrode, but the first electrode 21 may be the positive electrode and the second electrode 22 may be the negative electrode. In addition, the term "columnar" includes not only a non-bendable thickness but also a bendable fibrous thickness. The first electrode may have a columnar shape, and its cross section may be circular or polygonal. In this electricity storage device 20, one or more of the first electrode 21, the second electrode 22, and the separation membrane 24 may contain an electrolytic solution. Further, the first electrode 21 and the second electrode 22 may have a current collecting member such as a collecting wire embedded therein, or may not have the current collecting member. Also, the power storage device 20 may be an alkali metal secondary battery, an alkali metal ion secondary battery, a capacitor, a hybrid capacitor, or the like. Alkali metals include lithium, sodium and potassium, with lithium being preferred. Here, for convenience of explanation, a lithium secondary battery in which the first electrode 21 is a cylindrical negative electrode, the second electrode 22 is a positive electrode, and lithium ions are used as carriers will be described as a main example.

The power storage device 20 has a coil-shaped outer shape. The electric storage device 20 is not a stack of sheet-like electrodes, but has a columnar and coil-like shape with a predetermined direction as the longitudinal direction. The power storage device 20 may have, for example, a helical structure that is flexible, or may be non-flexible. The size of the power storage device 20 may be any value according to the performance required of the circuit device 10 . Also, although the power storage device 20 has a coil shape, the coil length A, coil diameter R, number of coil turns N, coil shape, etc. can be set to arbitrary values according to the performance required of the circuit device 10. can. For example, the coil length A can range from 5 mm to 100 mm. The coil diameter R can range from 5 mm to 100 mm. The number of coil turns N can range from 2 to 100, for example. The coil shape is, for example, generally cylindrical, but may be polygonal such as rectangular or hexagonal. Also, the power storage device 20 may have a core at the center of the coil. Note that the coil diameter R, the outer diameter D of the electricity storage device 20, the diameter d of the first electrode 21, and the like refer to the maximum values of the length of the outer shape when the target shape is polygonal or elliptical. do.

Various designs of the coil-shaped low-pass filter are conceivable depending on the circuit. Specific examples include the following cases. For example, in the case of a low-pass filter with an operating frequency of 10 kHz, the inductance is estimated to be about 10 μH for 48V. In this case, assuming that the voltage of the electricity storage device 20 is 4 V, the cell is about 1 μH, and if the coil diameter R of the electricity storage device 20 is 40 mm, the coil winding number N is estimated to be about 5. In a small system low-pass filter with an operating frequency of 100 kHz, the inductance is estimated to be about 1 μH for 48V. In this case, assuming that the voltage of the electricity storage device 20 is 4 V, the cell is about 100 mH.

In this coil-shaped electricity storage device, like the electricity storage device 20B shown in FIG. 2, the first electrode 21 may be a fiber bundle 21B in which a plurality of fibers 23 containing the first active material are bundled. The fiber bundle 21B may be formed by bundling the fibers 23 and then fixing them, or may be formed by spinning the fibers 23 . In this electric storage device 20B, since highly flexible fibers 23 are used, the first electrode 21 can be easily formed into a coil shape, which is preferable. The thickness of the fibers 23 can be, for example, 0.5 μm or more, 1 μm or more, or 10 μm or more, and can be 50 μm or less, 20 μm or less, or 15 μm or less. Moreover, like the electricity storage device 20C shown in FIG. 3, it may have a structure of a cell bundle 21C in which unit cells each having the first electrode 21, the separation membrane 24, and the second electrode 22 are bundled. In this electric storage device 20C, by bundling the single cells, the strength of the coil shape can be further increased, and the capacity of the electric storage device can be further increased, which is preferable. In this electricity storage device 20C, the first electrode 21 of the single cell of the cell bundle 21C may be integrated like the first electrode 21 shown in FIG. good too. Also, the second electrode 22 may be present around the first electrode 21 with the separation film 24 interposed therebetween, or may be filled in the space between the first electrodes 21 .

The power storage device 20 can control the magnetic flux generated by the current. The power storage device 20 may have one or more of a current smoothing function by inductance, a filter function by inductance, and a function of forming a closed magnetic circuit for current sensing. In addition, the power storage device 20 has a coil shape that is designed for a load in which the output current of the power storage device 20 pulsates, and that X/D, which is the ratio of the length X of the power storage device 20 to the outer diameter D, is 10 or more. may have When X/D is 10 or more, for example, it is easy to form a coil shape. This X/D may be 100 or more, 1000 or more, or 10000 or less. The electric storage device 20 preferably has an outer diameter D of 20 μm or more in a cross section perpendicular to the longitudinal direction, and may be 100 μm or more. Moreover, the outer diameter D of the electricity storage device 20 is preferably 1000 μm or less, and may be 500 μm or less. When the outer diameter D is 20 μm or more, sufficient discharge capacity can be secured. Further, when the outer diameter D is 1000 μm or less, the movement distance of carrier ions is not too long, and high output performance can be obtained. Further, when the outer diameter D is in the range of 100 μm to 500 μm, both high output performance and discharge capacity can be achieved. Also, the outer diameter D may be in the range of 1 μm or more and 100 μm or less, for example. Within this range, the electrical storage device 20 can be a micro-shaped coil-shaped power storage device 20 . The length X in the longitudinal direction of the electricity storage device 20 can be appropriately determined depending on the application of the circuit device 10, and may be, for example, in the range of 20 mm or more and 200 mm or less.

The first electrode 21 is a columnar body containing a negative electrode active material. The first electrode 21 faces the second electrode 22 with the separation film 24 interposed therebetween at least at the periphery other than the end face. The first electrode 21 preferably has a diameter d of a cross section perpendicular to the longitudinal direction of 10 μm or more, more preferably 50 μm or more. Also, the diameter d of the first electrode 21 is preferably 500 μm or less, more preferably 200 μm or less. When the diameter d is 10 μm or more, strength can be secured and stable charging and discharging can be performed. Further, when the diameter d is 500 μm or less, the moving distance of carrier ions does not become too long, and high output performance can be obtained. Further, when the diameter d is in the range of 50 μm to 200 μm, the moving distance of carrier ions can be shortened, and charging and discharging can be performed with a larger current. Furthermore, the diameter d of the first electrode 21 may be in the range of 0.5 μm or more and 50 μm or less. Within this range, the electrical storage device 20 can be a micro-shaped coil-shaped power storage device 20 . The length X of the columnar first electrode 21 in the longitudinal direction can be appropriately determined according to the application of the circuit device 10, and may be, for example, in the range of 20 mm or more and 200 mm or less. When the length X of the columnar body is 20 mm or more, the battery capacity can be further increased, and when it is 200 mm or less, the electrical resistance of the electrode can be further reduced, which is preferable. The first electrode 21 may contain one or more of a metal, an alloy, and a carbon material as a negative electrode active material. Metals include lithium metal, and alloys include lithium alloys and tin compounds. Carbon materials include, for example, one or more of graphites, cokes, vitreous carbons, non-graphitizable carbons, and pyrolytic carbons. Among these, graphites such as artificial graphite and natural graphite are preferred. Carbon fibers having a graphite structure may also be used. Such carbon fibers preferably have crystals oriented in the longitudinal direction, which is the fiber direction, for example. Moreover, it is preferable that the crystals are oriented radially from the center to the outer peripheral surface side when viewed in cross section in a direction orthogonal to the longitudinal direction (fiber direction). Alternatively, the columnar first electrode 21 may be formed by molding a composite oxide capable of intercalating and deintercalating carrier ions into a columnar body. Examples of composite oxides include lithium-titanium composite oxides. The first electrode 21 may have a conductive component formed on at least part of its surface. This conductive component can further increase the conductivity. This conductive component is not particularly limited as long as it is a highly conductive material, and may be, for example, a metal.

The separation film 24 has ion conductivity for ions (for example, lithium ions) that are carriers, and insulates the first electrode 21 and the second electrode 22 from each other. The isolation film 24 is formed on the entire outer peripheral surface of the first electrode 21 facing the second electrode 22 to prevent short-circuiting between the first electrode 21 and the second electrode 22 . The separation membrane 24 may be made of a resin having ionic conductivity and insulating properties. The separation membrane 24 may be formed, for example, by preparing a self-supporting film from a raw material solution containing a resin and coating the surface of the first electrode 21 with this self-supporting film, or by inserting the first electrode 21 into the raw material solution. It may be formed by dipping and coating the surface. Examples of this resin include polyvinylidene fluoride (PVdF), a copolymer of PVdF and hexafluoropropylene (PVdF-HFP), polymethyl methacrylate (PMMA), and a copolymer of PMMA and an acrylic polymer. are mentioned. For example, in the case of a copolymer of PVdF and HFP, part of the electrolytic solution swells and gels the film, forming an ion-conducting film. For example, the thickness of the separation membrane 24 is preferably 2 μm or more, more preferably 5 μm or more, and may be 8 μm or more. A thickness L of 2 μm or more is preferable for ensuring insulation. In particular, if the thickness of the separation membrane 24 is 2 μm or more, it is easy to manufacture. Also, the thickness of the separation membrane 24 is preferably 15 μm or less, more preferably 10 μm or less. A thickness L of 15 μm or less is preferable in terms of suppressing a decrease in ionic conductivity and further reducing the volume occupied in the cell. When the thickness L is in the range of 2 to 15 μm, the ionic conductivity and insulating properties are favorable.

Separation membrane 24 may contain an electrolytic solution that conducts ions that are carriers. Examples of the electrolytic solution include non-aqueous solvents. Solvents for the electrolytic solution include, for example, solvents for non-aqueous electrolytic solutions. Examples of the solvent include carbonates, esters, ethers, nitriles, furans, sulfolanes and dioxolanes, and these can be used singly or in combination. Specifically, the carbonates include cyclic carbonates such as ethylene carbonate (EC), propylene carbonate, vinylene carbonate, butylene carbonate, and chloroethylene carbonate, dimethyl carbonate (DMC), ethylmethyl carbonate (EMC), diethyl carbonate, ethyl - chain carbonates such as n-butyl carbonate, methyl-t-butyl carbonate, di-i-propyl carbonate and t-butyl-i-propyl carbonate; cyclic esters such as γ-butyl lactone and γ-valerolactone; Chain esters such as methyl formate, methyl acetate, ethyl acetate and methyl butyrate; ethers such as dimethoxyethane, ethoxymethoxyethane and diethoxyethane; nitriles such as acetonitrile and benzonitrile; furans such as tetrahydrofuran and methyltetrahydrofuran. sulfolane such as sulfolane and tetramethylsulfolane; and dioxolane such as 1,3-dioxolane and methyldioxolane. The electrolytic solution may contain a supporting salt containing ions, which are carriers of the electric storage device 20, dissolved therein. Examples of supporting salts include _LiPF6 , _LiBF4 , _LiAsF6 , _LiCF3SO3 , LiN( _CF3SO2 ) ₂ , _{LiC ( CF3SO2} ) ₃ , _LiSbF6 , _LiSiF6 , _LiAlF4 , _LiSCN , LiClO ₄ , LiCl, LiF, LiBr, LiI, LiAlCl ₄ and the like. Among them, 1 selected from the group consisting of inorganic salts such as LiPF ₆ , LiBF ₄ and LiClO ₄ and organic salts such as LiCF ₃ SO ₃ , LiN(CF ₃ SO ₂ ) ₂ and LiC(CF ₃ SO ₂ ) ₃ From the viewpoint of electrical properties, it is preferable to use a species or a combination of two or more salts. The concentration of the supporting salt in the electrolytic solution is preferably 0.1 mol/L or more and 5 mol/L or less, more preferably 0.5 mol/L or more and 2 mol/L or less.

The second electrode 22 contains a positive electrode active material and is formed around the outer periphery of the first electrode 21 with a separation film 24 interposed therebetween. The second electrode 22 itself may be conductive, and the collector member and the like may be omitted. The second electrode 22 may have a current collector directly connected to part or all of its outer surface. The second electrode 22 may be formed, for example, by forming the separation membrane 24 around the outer circumference of the first electrode 21 and then coating the outer circumference with the raw material of the second electrode 22 . The second electrode 22 contains a positive electrode active material, but if the positive electrode active material does not have conductivity, it may be mixed with a conductive material having conductivity, for example. For example, the second electrode 22 may be formed by mixing a positive electrode active material, optionally a conductive material, and a binder. Examples of the positive electrode active material include materials capable of intercalating and deintercalating lithium, which is a carrier. Examples of positive electrode active materials include compounds containing lithium and a transition metal, such as oxides containing lithium and a transition metal element, and phosphate compounds containing lithium and a transition metal element. Specifically, a lithium-manganese composite oxide having a basic composition formula of Li _(1-x) MnO ₂ (0≦x≦1, etc., hereinafter the same) or Li _(1-x) Mn ₂ O ₄ , etc., basic composition A lithium cobalt composite oxide having a formula such as Li _{( 1} -x)CoO2, a lithium nickel composite oxide having a basic composition formula such as Li( _{1 -x)} NiO2, and a basic composition formula of Li _{(1-x) CoaNibMncO2 (} a>0, _b >0, _c >0, a+b+ _c =1), Li _{(1-x) CoaNibMncO4 (} 0<a<1, 0< _b <1, 1 ≤ c < 2, a + b + c = 2), etc., lithium vanadium composite oxides with a basic composition formula of LiV ₂ O ₃ , etc., basic composition formulas of V ₂ O ₅ , etc. A transition metal oxide or the like can be used. Also, a lithium iron phosphate compound having a basic compositional formula of LiFePO ₄ or the like can be used as the positive electrode active material. Among these, lithium-cobalt-nickel-manganese composite oxides such as LiCo _1/3 Ni _1/3 Mn _1/3 O ₂ are preferred. In addition, the "basic composition formula" means that other elements such as Al and Mg may be included. Alternatively, the positive electrode active material may be a carbonaceous material used in capacitors, lithium ion capacitors, and the like. Carbonaceous materials include, for example, activated carbons, cokes, vitreous carbons, graphites, non-graphitizable carbons, pyrolytic carbons, carbon fibers, carbon nanotubes, and polyacenes. Among these, activated carbons exhibiting a high specific surface area are preferred. Activated carbon as the carbonaceous material preferably has a specific surface area of 1000 m ² /g or more, more preferably 1500 m ² /g or more. When the specific surface area is 1000 m ² /g or more, the discharge capacity can be further increased. The specific surface area of this activated carbon is preferably 3000 m ² /g or less, more preferably 2000 m ² /g or less, for ease of production.

The conductive material contained in the second electrode 22 is not particularly limited as long as it is an electronic conductive material that does not adversely affect the battery performance. Black, carbon black, ketjen black, carbon whisker, needle coke, carbon fiber, metals (copper, nickel, aluminum, silver, gold, etc.) can be used alone or in combination of two or more. The binder plays a role of binding the active material particles and the conductive material particles to keep them in a predetermined shape. Fluororesins, thermoplastic resins such as polypropylene and polyethylene, ethylene propylene diene monomer (EPDM) rubbers, sulfonated EPDM rubbers, natural butyl rubbers (NBR), and the like can be used alone or as a mixture of two or more. Cellulose-based or styrene-butadiene rubber (SBR) aqueous dispersions, which are water-based binders, can also be used.

In the second electrode 22, the content of the positive electrode active material is preferably larger, preferably 70% by mass or more, more preferably 80% by mass or more with respect to the entire mass of the second electrode 22. . The content of the conductive material is preferably in the range of 0% by mass or more and 20% by mass or less, more preferably in the range of 0% by mass or more and 10% by mass or less with respect to the entire mass of the second electrode 22. . Within such a range, a decrease in battery capacity can be suppressed and sufficient conductivity can be imparted. In addition, the content of the binder is preferably in the range of 0.1% by mass or more and 5% by mass or less with respect to the entire mass of the second electrode 22, and is in the range of 0.2% by mass or more and 3% by mass or less. is more preferable.

In the electricity storage device 20, the positive/negative electrode capacity ratio (negative electrode capacity/positive electrode capacity), which is the ratio of the capacity of the negative electrode active material to the capacity of the positive electrode active material, is preferably in the range of 1.0 or more and 1.5 or less. More preferably, it is in the range of 1.2 or less. The formation thickness of the second electrode 22 is appropriately set according to the diameter d of the first electrode 21 and the positive/negative electrode capacity ratio, and may be, for example, in the range of 5 μm or more and 50 μm or less. The formation thickness of the positive electrode refers to, for example, the maximum thickness of the portion formed on the first electrode 21 .

The power storage device 20 can be manufactured by the manufacturing method described below. The method of manufacturing the electricity storage device 20 may be, for example, forming the separation film 24 and the second electrode 22 after forming the first electrode 21 into a coil shape. This molding can be performed, for example, by extruding a raw material containing the active material. Here, when fabricating the electric storage device 20C having the structure of the cell bundle 21C of FIG. After that, the space between the first electrodes 21 may be filled with the second electrodes 22 . Further, when the first electrode 21 is flexible, after forming the separation film 24 and the second electrode 22 on the first electrode 21 to obtain the linear electric storage device 20, the electric storage device 20 is coiled. It may be transformed. In the step of forming the separation membrane 24 , for example, a resin having ion conductivity and insulation is formed on the first electrode 21 containing the active material, and heated and melted to form the separation membrane 24 on the first electrode 21 . It can be a thing. At this time, a raw material solution may be prepared by dissolving a resin in a solvent, and this raw material solution may be applied onto the first electrode 21, or the first electrode 21 may be immersed in the raw material solution. In the step of forming the second electrode 22 , the separation film 24 may be formed on the surface of the first electrode 21 and then the electrode mixture of the second electrode 22 may be formed on the separation film 24 . At this time, a slurry may be prepared by adding the electrode compound material to a solvent, and the slurry may be applied onto the separation membrane 24, or the first electrode 21 may be immersed in the slurry. In this manner, the electric storage device 20 having a coil-shaped outer shape can be manufactured.

In the circuit device 10 including the electrical storage device 20 described in detail above, the circuit configuration can be further simplified. The reason why such effects are obtained will be described below. In general, for example, in a circuit using a power storage device such as a secondary battery, noise generation may pose a problem. There are various causes of noise, but when attenuating high-frequency components, it is common to include an element that functions as a low-pass filter in the circuit. Low-pass filters include a method of inserting a coil 130 in series (FIG. 4A) and a method of inserting a capacitor 230 across the noise source (FIG. 4B). In the circuit device 10 described above, by forming the power storage device arranged in series in the circuit into a coil shape, the device itself has an inductor component, and a low-pass filter is arranged without a coil as a low-pass filter. Allows for equivalent noise reduction. Thus, the power storage device 20 as a power supply has a coil shape useful for noise reduction, and the circuit device 10 can omit the noise reduction coil 130 . Therefore, the present disclosure can further simplify the circuit configuration. The same applies to the circuit devices 10B and 10C.

It goes without saying that the present disclosure is not limited to the above-described embodiments, and can be implemented in various forms as long as they fall within the technical scope of the present disclosure.

For example, in the above-described embodiment, the negative electrode and the positive electrode in the electricity storage device 20 do not include a current collecting member. You may have

Further, in the above-described embodiment, the carrier of the electricity storage device 20 is lithium ions, but it is not particularly limited to this. good too.

In the above-described embodiment, the cross-sectional shape of the first electrode 21 and the electricity storage device 20 has been explained as an example in which it is columnar, but it is not particularly limited to this, and may be in the shape of a square column, a hexagonal column, an elliptical column, or the like. .

Reference Signs List 10, 10B, 10C, 110, 210 circuit device, 12 load, 15 noise source, 20, 20B, 20C, 120 power storage device, 21 first electrode, 21B fiber bundle, 21C cell bundle, 22 second electrode, 23 Fiber, 24 separation membrane, 130 coil, 230 capacitor, A coil length, d diameter, D outer diameter, N number of coil turns, R coil diameter, X length.

Claims (7)

a columnar first electrode having a first active material and including fibrous;
a separation membrane having ionic conductivity and insulation and covering the first electrode;
a second electrode formed on the separation membrane and having a second active material;
A power storage device having a coil-shaped outer shape,
The electric storage device has one or more of a current smoothing function by inductance, a filter function by inductance, and a function of forming a closed magnetic circuit for current sensing . 2. The circuit apparatus according to claim 1, wherein said power storage device controls magnetic flux generated by current. 2. The coil shape of claim 1 or 2, wherein X/D, which is the length X of the electricity storage device with respect to the outer diameter D of the electricity storage device, is 10 or more, and the output current of the electricity storage device has a coil shape designed for a pulsating load. 3. The circuit device according to 2. 4. The circuit device according to any one of claims 1 to 3 , wherein said first electrode is a bundled body in which a plurality of fibrous first active materials are bundled. 5. The circuit device according to claim 1 , wherein said electricity storage device has a structure in which single cells each having said first electrode, said separation membrane and said second electrode are bundled together. 6. The circuit device according to claim 1, wherein said first electrode has a diameter d in the range of 10 μm to 500 μm. 7. The circuit device according to claim 1, wherein said separation film has a thickness of 15 μm or less.

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