JP2007012803A - Electrochemical element - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrochemical element comprising a concave container and a sealing plate, capable of preventing the sealing plate or a cell content from scattering, when cell internal pressure rises. <P>SOLUTION: An electric double-layer capacitor comprises a pair of polarizable electrodes 1a and 1b, an electrolysis solution, and a container which accommodates polarizable electrodes 1a and 1b and the electrolysis solution. A container consists of a concave frame 3, and a sealing plate 5 for sealing the opening of the frame 3. Furthermore, terminals 6a and 6c and a protection element 7 are embedded in the frame 3 or in the inside of the sealing plate 5. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electrochemical device including a pair of electrodes, an electrolytic solution, and a container that houses the pair of electrodes and the electrolytic solution.

  Conventionally, electrochemical devices such as chemical batteries and electric double layer capacitors with high volumetric energy density have been used for backup power supplies and auxiliary power supplies for mobile phones and household electrical products, and high performance is expected. .

  These electrochemical elements are soldered and mounted on printed circuit boards of various electronic devices. Conventional electrochemical devices have a round shape such as a coin type or a button type, and in order to solder this to a printed circuit board, it is necessary to attach terminals. Also, because of the round shape, the occupied area during mounting is larger than the container of the electrochemical element. For this reason, an electric double layer capacitor comprising a concave container using ceramic or resin and a sealing plate having a metal part has been disclosed (for example, see Patent Document 1 and Patent Document 2). As a result, the terminal attachment process and the mounting area can be reduced.

On the other hand, the high volume energy density of these electrochemical elements increases the influence when overcurrent or overheating occurs. Therefore, when actually using an electrochemical element using an organic electrolyte, an electronic element such as a protective element or a temperature sensor is required to protect the electrochemical element from overcurrent or overheating and to improve reliability. Therefore, it is required to reduce the installation space with these components mounted. In response to such demands, in an electrochemical element using a flexible film with a protective element added to the outer bag, the internal heat is reliably transmitted to the protective element without changing the maximum thickness, thereby ensuring safety. Has been disclosed (see, for example, Patent Document 3). Also, a space formed by an adhesive portion in which at least two or more electrochemical elements are stacked so that output terminals of different polarities face each other, and the output terminals of the two or more electrochemical elements are led out. However, a structure that forms a space having a thickness larger than the thickness of the electrochemical element is also disclosed (for example, see Patent Document 4).
JP-A-11-54387 JP 2001-216852 A JP 2002-8630 A JP 2003-257393 A

  However, in the electrochemical element that employs the technology disclosed in Patent Document 3 and Patent Document 4 described above, when various electronic elements are soldered to a printed circuit board and mounted, the mounting area becomes large or small electrochemical The element has a problem that it is difficult to accommodate the electronic element.

  Therefore, in view of the above problems, the present invention provides an electrochemical element composed of a concave frame body and a sealing plate, which simultaneously realizes space saving and improved reliability. With the goal.

  In order to achieve the above object, the present inventors have focused on embedding an electronic element inside a concave frame or sealing plate, and have completed the present invention.

  A feature of the present invention is an electrochemical element including a pair of electrodes, an electrolytic solution, and a container that accommodates the pair of electrodes and the electrolytic solution, and the container includes a concave frame and an opening of the frame. The gist of the present invention is an electrochemical element that is composed of a sealing plate to be sealed, and in which an electronic element is embedded in the frame or the sealing plate.

  Here, the “electronic element” refers to an element, a circuit, or the like for protecting the electrochemical element from overcurrent or overheating and improving reliability. For example, a positive temperature coefficient thermistor (PTC element), a Zener diode, Examples include a protective element such as a varistor, and a temperature sensor such as a thermocouple, thermistor, and resistance temperature detector.

  According to the electrochemical device according to the features of the present invention, it is possible to simultaneously realize space saving and improved reliability by embedding the electronic device in the frame or the sealing plate.

  In the electrochemical device according to the feature of the present invention, the frame body or the sealing plate in which the electronic device is embedded may be made of a resin.

  In this case, the electronic element may be embedded in the frame or the sealing plate by insert molding, or may be embedded by welding or bonding two or more resin parts constituting the frame or the sealing plate.

  Since the resin used for the frame or the sealing plate has a relatively low melting point of 270 to 400 ° C., according to this electrochemical element, even an electronic element having low heat resistance can be embedded.

  In the electrochemical device according to the feature of the present invention, the frame is formed by laminating a plurality of layers made of ceramic, and the electronic device is disposed on the surface of the layer, and the frame is formed by sintering the frame. It may be embedded inside.

  According to this electrochemical element, the electronic element can be formed as a thin film by a screen printing method, and the electronic element can be easily embedded in the frame.

  According to the present invention, it is possible to provide an electrochemical element including a concave frame body and a sealing plate, which simultaneously realizes space saving and improved reliability.

  Next, embodiments of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic and ratios of dimensions and the like are different from actual ones. Accordingly, specific dimensions and the like should be determined in consideration of the following description. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings.

(First embodiment)
In the first embodiment, an electric double layer capacitor including a concave frame and a sealing plate will be described as an example of an electrochemical element.

  As shown in FIG. 1, the electric double layer capacitor includes a pair of polarizable electrodes 1a and 1b, a separator 2 interposed between the pair of polarizable electrodes 1a and 1b, a pair of polarizable electrodes 1a and 1b, and a separator. 2 to be impregnated. The container for storing the polarizable electrodes 1 a and 1 b and the electrolyte is composed of a concave frame 3 and a sealing plate 5 that seals the opening of the frame 3.

  A current collector 4 a is disposed on the inner bottom surface of the frame 3, and a current collector 4 b is disposed on the inner surface of the sealing plate 5 on the polarizable electrode 1 b side. The polarizable electrode 1a and the current collector 4a, and the polarizable electrode 1b and the current collector 4b are joined by a conductive adhesive layer. The terminals 6a and 6c and the protective element 7 are embedded in the frame 3 by insert molding and are electrically connected in series with the pair of polarizable electrodes 1a and 1b.

  The current collector 4 a is electrically connected to a terminal 6 c embedded in the frame 3, and the protective element 7 embedded in the frame 3 includes a terminal 6 a embedded in the frame 3 and It is electrically connected to the terminal 6c. The current collector 4 b is electrically connected to a terminal 6 b that penetrates the wall surface of the frame 3 and extends to the outer bottom surface of the frame 3.

  The concave frame 3 is made of a resin such as polyether ether ketone, polyphenylene sulfide, or liquid crystal polymer having a melting point of 270 to 400 ° C. so as to withstand the processing temperature of the soldering process at the time of mounting.

  Sealing plate 5 is made of a metal material such as nickel, copper, brass, zinc, tin, gold, platinum, stainless steel (SUS444, SUS239J4L, SUS317J4L, etc.), tungsten, aluminum, cobalt, or a heat resistant resin, glass, ceramics or ceramic glass. It consists of heat-resistant materials such as. When the sealing board 5 is comprised from a metal material, the sealing board 5 can serve as the electrical power collector 4b.

  In FIG. 1, the terminals 6 a and 6 c and the protective element 7 are embedded in the frame 3, but the sealing plate 5 is formed of resin and the terminals and protective elements are embedded in the sealing plate 5. May be.

  In addition to the insert mold, the protective element 7 in FIG. 1 is configured by forming the frame 3 with two or more resin parts and bonding or welding the protective elements 7 so as to be embedded between the resin parts. Can also be buried.

  The conductive adhesive layer is made of conductive material such as gold, platinum, nickel, carbon, polyvinylidene fluoride (PVdF), polyimide (PI) resin, styrene-butadiene resin represented by SBR, polypropylene, and polyethylene. What mixed resin, such as the representative polyolefin resin, can be illustrated.

  The polarizable electrodes 1a and 1b are produced by extracting sheet-like activated carbon made of activated carbon fiber or activated carbon powder with a punching die. The polarizable electrode material can be used as long as it is an electrochemically inert material having a high specific surface area, but it is preferable to mainly use activated carbon powder having a large specific surface area. In addition to the activated carbon powder, materials having a large specific surface area such as carbon black, metal fine particles, and conductive metal oxide fine particles can be preferably used. In many cases, the polarizable electrode mainly composed of these polarizable electrode materials is used for both the positive electrode and the negative electrode to form an electric double layer capacitor as shown in FIG. A polarizable electrode may be used, and the other one may be a nonpolarizable electrode material that can be charged / discharged, that is, a nonpolarizable electrode mainly composed of a secondary battery active material.

  The current collectors 4a and 4b for electrically connecting the polarizable electrodes 1a and 1b may be any material having excellent conductivity and electrochemical durability, such as a valve made of aluminum, titanium or tantalum. Carbon-based materials such as metals, stainless steel, noble metals such as gold and platinum, and conductive rubbers including graphite, glassy carbon, and carbon black can be preferably used.

  As the separator 2, an insulating film or cloth having a large ion permeability and a predetermined mechanical strength is used. In reflow soldering, glass fibers can be used most stably, but resins such as polyphenylene sulfide, polyethylene terephthalate, polyamide, polyimide having a heat distortion temperature of 230 ° C. or higher can also be used. The pore diameter and thickness of the separator 2 are not particularly limited, and are design matters determined based on the current value of the device used and the internal resistance of the capacitor. The separator 2 may be a ceramic porous body.

  The electrolytic solution is an organic electrolytic solution. Here, the solvent used in the electrolytic solution may be any solvent that can dissolve the electrolyte, and generally a known solvent used in the electrolytic solution of an electric double layer capacitor or a non-aqueous electrolyte secondary battery should be used. Can do. For example, ethylene carbonate, propylene carbonate, butylene carbonate, γ-butyrolactone, γ-valerolactone, sulfolane, ethylene glycol, polyethylene glycol, vinylene carbonate, chloroethylene carbonate, dimethyl carbonate, diethyl carbonate, methyl ethyl carbonate, dipropyl carbonate, dibutyl Use carbonate, dimethoxymethane, dimethoxyethane, methoxyethoxyethane, diethoxyethane, tetrahydrofuran, 2-methyl-tetrahydrofuran, dimethylformamide, dimethyl sulfoxide, acetonitrile, methyl formate, dioxolane, 4-methyl-1,3-dioxolane, etc. be able to.

  In addition, as the electrolyte in the above electrolytic solution, alkali metal salts such as sodium salts and potassium salts, ammonium salts, and the like can be used.

Here, as the above ammonium salt, for _{example, NH 4 ClO 4, NH 4} BF 4, NH 4 PF 6, NH 4 CF 3 SO 3, (NH 4) 2 B 10 Cl 10, (NH 4) 2 B ₁₂ Cl ₁₂ , NH ₄ N (CF ₃ SO ₂ ) ₂ , NH ₄ N (C ₂ F ₃ SO ₂ ) ₂ , NH ₄ N (C ₄ F ₉ SO ₂ ) (CF ₃ SO ₂ ), NH ₄ C ( CF ₃ SO ₂ ) ₃ or the like can be used.

Examples of other electrolytes include (C ₂ H ₅ ) ₄ NClO ₄ , (C ₂ H ₅ ) ₄ NBF ₄ , (C ₂ H ₅ ) ₄ NPF ₆ , (C ₂ H ₅ ) ₄ NCF ₃ SO ₃ , [(C ₂ H ₅ ) ₄ N] ₂ B ₁₀ Cl ₁₀ , [(C ₂ H ₅ ) ₄ N] ₂ B ₁₂ Cl ₁₂ , (C ₂ H ₅ ) ₄ N (CF ₃ SO ₂ ) ₂ , (C _{2 H 5) 4 N (C} 2 F 5 SO 2) 2, (C 2 H 5) 4 N (C 4 F 9 SO 2) (CF 3 SO 2), (C 2 H 5) 4 C (CF 3 SO ₂ ) ₃ or the like can be used.

  According to the electrochemical device according to the first embodiment, by embedding an electronic device such as the protective device 7 in the frame 3 or the sealing plate 5, space saving and improved reliability can be realized at the same time. be able to.

  Further, the frame body 3 or the sealing plate 5 is made of resin, and the protective element 7 can be embedded in the frame body 3 or the sealing plate 5. Since the resin used for the frame 3 or the sealing plate 5 has a relatively low melting point of 270 to 400 ° C., even an electronic element having low heat resistance can be embedded.

(Second Embodiment)
In the second embodiment, an electric double layer capacitor having a concave frame and a sealing plate will be described as an example of an electrochemical element.

  As shown in FIG. 4, the electric double layer capacitor includes a pair of polarizable electrodes 1a and 1b, a separator 2 interposed between the pair of polarizable electrodes 1a and 1b, a pair of polarizable electrodes 1a and 1b, and a separator. 2 to be impregnated. The container for storing the polarizable electrodes 1 a and 1 b and the electrolyte is composed of a concave frame 3 and a sealing plate 5 that seals the opening of the frame 3.

  A current collector 4 a is disposed on the inner bottom surface of the frame 3, and a current collector 4 b is disposed on the inner surface of the sealing plate 5 on the polarizable electrode 1 b side. The polarizable electrode 1a and the current collector 4a, and the polarizable electrode 1b and the current collector 4b are joined by a conductive adhesive layer.

  The concave frame 3 is formed by laminating a plurality of ceramic layers 3a, 3b,.

  The terminals 6a, 6c, 6d and the temperature sensor 8 are arranged on the surfaces of the ceramic layers 3e and 3f and inside the layers, and are embedded in the frame 3 by sintering the frame 3.

  Specifically, the ceramic layer 3e is made of a thin film having a terminal 6a printed on the surface, and the ceramic layer 3f is made of a thin film having a terminal 6c, a temperature sensor 8, and a terminal 6d printed on the surface.

  The terminal 6a is formed of a metal embedded in a via hole penetrating the ceramic layer 3e and the ceramic layer 3f, and one end thereof is formed on the surface of the ceramic layer 3e and the other end is formed on the back surface of the ceramic layer 3f. One end formed on the surface of the ceramic layer 3e is connected to the current collector 4a.

  The terminal 6c is formed of a metal embedded in a via hole penetrating the ceramic layer 3f, and has one end formed on the surface of the ceramic layer 3f and the other end formed on the back surface of the ceramic layer 3f. One end of the terminal 6 c formed on the surface of the ceramic layer 3 f is connected to one end of the temperature sensor 8.

  Similarly to the terminal 6c, the terminal 6d is formed of a metal embedded in a via hole penetrating the ceramic layer 3f, and one end thereof is formed on the surface of the ceramic layer 3f and the other end is formed on the back surface of the ceramic layer 3f. One end of the terminal 6d formed on the surface of the ceramic layer 3f is connected to one end of the temperature sensor 8 different from the end to which the terminal 6c is connected.

  The current collector 4a is electrically connected to a terminal 6a embedded in the frame 3, and the temperature sensor 8 is electrically connected to the terminal 6c and the terminal 6d. The current collector 4 b is electrically connected to a terminal 6 b that penetrates the wall surface of the frame 3 and extends to the outer bottom surface of the frame 3.

  The polarizable electrodes 1a and 1b, the separator 2, the current collectors 4a and 4b, the sealing plate 5 and the conductive adhesive layer in the second embodiment are the same as those in the first embodiment. Omitted.

  The ceramic layers 3a, 3b,..., 3f can be made of a ceramic and glass mixture in addition to ceramic. By using a mixture of ceramic and glass, the sintering temperature of the frame 3 can be lowered.

  In FIG. 4, the terminals 6 a, 6 c, 6 d and the temperature sensor 8 are embedded in the frame 3, but the sealing plate 5 is formed of a laminated ceramic, and the terminals and temperature are provided inside the sealing plate 5. Sensors may be embedded.

  According to the electrochemical element according to the second embodiment, the frame 3 is configured by laminating a plurality of ceramic layers, and the electronic elements such as the temperature sensor 8 are disposed on the surface of the ceramic layer and inside the ceramic layer. It can be embedded and embedded in the frame 3 by sintering the frame 3. In addition, according to this electrochemical element, the electronic element can be formed as a thin film by a screen printing method, and the electronic element can be easily embedded in the frame 3.

(Other embodiments)
Although the present invention has been described according to the above-described embodiments, it should not be understood that the descriptions and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

  For example, the electrochemical element according to the present embodiment has been described using an electric double layer capacitor. However, the present invention is not limited thereto, and a thin battery such as a lithium battery or a polyacene battery including a concave container and a sealing plate is used. In the present invention, the present invention can be similarly applied. Note that the material of such an element is not particularly limited, and the element can be manufactured using a known material.

  As described above, the present invention naturally includes various embodiments not described herein. Therefore, the technical scope of the present invention is defined only by the invention specifying matters according to the scope of claims reasonable from the above description.

  Hereinafter, the electric double layer capacitor according to the present invention will be specifically described by way of examples. In addition, the electric double layer capacitor according to the present invention is not limited to those shown in the following examples, and can be appropriately changed and implemented without departing from the gist thereof.

Example 1
In Example 1, as described below, polarizable electrodes 1a and 1b were prepared, and an electrolytic solution was prepared to produce an electric double layer capacitor as shown in FIG.

[Preparation of polarizable electrode]
Acetaldehyde black 5 wt% and polytetrafluoroethylene (PTFE) 5 wt% are added to activated carbon powder having a specific surface area of 2000 m ² / g and kneaded, and square polarizable electrodes 1 a and 1 b having a thickness of 3.8 mm and a thickness of 0.5 mm are obtained. Produced.

[Preparation of electrolyte]
Propylene carbonate was used as a solvent, and (C ₂ H ₅ ) ₄ NBF ₄ as a solute was dissolved at a concentration of 1 mol / l to prepare an electrolytic solution.

[Production of electric double layer capacitor cell]
The two polarizable electrodes 1a and 1b produced as described above were opposed to each other with a glass fiber separator 2 interposed therebetween, and a current collector 4a by plating was previously provided on the bottom surface of this electrode group. , And housed in a frame 3 having a side of 5 mm and a height of 1.5 mm. And after inject | pouring the said electrolyte solution of the same volume as an electrode volume so that an electrode may fully immerse in the frame 3, the liquid collector made from the liquid crystal polymer by which the collector 4b was provided by plating in the part which contact | connects the polarizable electrode 1b The sealing plate 5 was sealed by ultrasonic welding to obtain an electric double layer capacitor.

  Here, the frame 3 is composed of a liquid crystal polymer having a melting point of 270 to 400 ° C., and the terminals 6 a and 6 c and the protective element 7 are embedded in the frame 3 by an insert mold when the frame 3 is manufactured. And electrically connected in series with the pair of polarizable electrodes 1a and 1b. Further, a positive temperature coefficient thermistor (PTC element) was used as the protective element 7. Specifically, as the terminals 6a and 6c, two stainless steel frames having a thickness of 0.2 mm and a width of 1.0 mm are used, and both ends of a chip-shaped protective element 7 having a side of 1.0 mm and a thickness of 0.2 mm are used. Was subjected to insert molding in a state of being fixed to the terminals 6a and 6c by spot welding or a conductive adhesive. In addition, since the insert molding process using a liquid crystal polymer can be manufactured at a temperature similar to that of a general electronic element molding process, electronic elements embedded in the frame 3 include thermistors, transistors, diodes, varistors, and the like. A small IC such as an electronic element or a wireless tag IC can be used.

  In the electric double layer capacitor manufactured by the above method, since the protective element 7 is embedded inside the frame 3, compared with the case where the protective element 7 is attached outside the frame 3 as in the prior art. Thus, not only the installation area can be reduced, but also when the temperature of the electric double layer capacitor rises, the internal resistance of the protective element 7 increases rapidly, and the electric current of the electric double layer capacitor can be suppressed.

(Example 2)
In Example 2, an electric double layer capacitor as shown in FIG. 2 is obtained in the same manner as in Example 1 except that an electronic element embedded in the frame 3 and its electrical connection method are different. It was.

  That is, the frame body 3 in Example 2 is made of a liquid crystal polymer resin, and the terminals 6a and the protective elements 7 were embedded in the frame body 3 by insert molding when the frame body 3 was produced. The terminals 6a and 6b are electrically connected to the current collector 4a and current collector 4b, respectively, and the protective element 7 is electrically connected in parallel to the pair of polarizable electrodes 1a and 1b. A varistor was used as the protective element 7.

  In the electric double layer capacitor created by the above method, when an excessive voltage is applied to the electric double layer capacitor, the internal resistance of the protective element 7 is quickly reduced, and an excessive current flows through the electric double layer capacitor. Can be prevented. In particular, since the protective element 7 is embedded in the frame 3, compared to the case where the protective element 7 is attached to the outside of the frame 3 as in the prior art, the electrostatic capacitance to the protective element 7 is increased. The influence of surge can be avoided. The same effect can be obtained even if a Zener diode is used as the protective element 7.

(Example 3)
In Example 3, an electric double layer capacitor as shown in FIG. 3 is obtained in the same manner as in Example 1 except that the electronic element embedded in the frame 3 and its electrical connection method are different. It was.

  That is, the frame body 3 in Example 3 is made of a liquid crystal polymer resin, and the terminals 6a, 6c, 6d and the temperature sensor 8 are embedded in the frame body 3 by an insert mold when the frame body 3 is manufactured. It was. The terminals 6a and 6b are electrically connected to the current collector 4a and current collector 4b, respectively, and the temperature sensor 8 is electrically connected to the terminals 6c and 6d. The temperature sensor 8 was a thermocouple. The temperature sensor 8 was electrically insulated from the pair of polarizable electrodes 1a and 1b.

  In the electric double layer capacitor manufactured by the above method, since the temperature sensor 8 is embedded inside the frame body 3, as compared with the conventional case where the temperature sensor is attached outside the frame body. The temperature change of the electric double layer capacitor can be measured with good followability. The same effect can be obtained even if a thermistor or a resistance temperature detector is used as the temperature sensor 8.

Example 4
In Example 4, the frame 3 was made of a multilayer ceramic, and an electric double layer capacitor as shown in FIG. 4 was obtained.

  That is, the frame 3 in Example 4 is composed of six laminated ceramic layers (ceramic green sheets) 3a, 3b, ..., 3f. The external shape of the ceramic green sheet was a square shape with a side of 5 mm.

  The ceramic layer 3e is made of a ceramic green sheet on the surface of which a predetermined pattern that becomes a part of the terminal 6a is formed by screen printing. Further, the ceramic layer 3e has one via hole penetrating therein, and a metal that becomes a part of the terminal 6a is embedded in the via hole.

  The ceramic layer 3f is made of a ceramic green sheet on the surface of which a predetermined pattern to be the temperature sensor 8 and a part of the terminals 6c and 6d are formed by screen printing. Moreover, the ceramic layer 3f has two via holes penetrating therein, and the metal which becomes a part of the terminal 6c and the terminal 6d, respectively, is buried in the two via holes.

  Then, the six ceramic layers 3a, 3b,..., 3f are stacked, pressed, and fired in a nitrogen atmosphere, whereby the terminals 6a, 6c, 6d and the temperature sensor 8 are embedded in the frame 3. A structure similar to that of Example 3 was obtained.

  Specifically, the terminal 6a is formed of a metal embedded in a via hole penetrating the ceramic layer 3e and the ceramic layer 3f, and one end thereof is formed on the surface of the ceramic layer 3e and the other end is formed on the back surface of the ceramic layer 3f. It was. One end formed on the surface of the ceramic layer 3e was connected to the current collector 4a.

  The terminal 6c is formed of a metal embedded in a via hole penetrating the ceramic layer 3f, and one end thereof is formed on the surface of the ceramic layer 3f and the other end is formed on the back surface of the ceramic layer 3f. One end of the terminal 6 c formed on the surface of the ceramic layer 3 f was connected to one end of the temperature sensor 8.

  Similarly to the terminal 6c, the terminal 6d was formed of a metal embedded in a via hole penetrating the ceramic layer 3f, and one end thereof was formed on the surface of the ceramic layer 3f and the other end was formed on the back surface of the ceramic layer 3f. One end of the terminal 6d formed on the surface of the ceramic layer 3f was connected to one end of the temperature sensor 8 different from the end to which the terminal 6c was connected.

  Further, the temperature sensor 8 was formed by forming a pattern having a thickness of 1 μm, a width of 50 μm, and a length of 1 mm on a ceramic green sheet with a paste containing a metal or an oxide thereof. In the paste, when the ceramic layers 3a, 3b,..., 3f are high-temperature sintered ceramics (sintering temperature 1000 ° C. or higher), metals or metal oxides such as Pt, Pd, and W are added to the ceramic layers 3a, 3b. When 3f is a low-temperature sintered ceramic (sintering temperature 900 to 1000 ° C.), a material containing a metal or metal oxide such as Ag or Cu is used. In order to prevent diffusion during sintering, the surface of the temperature sensor 8 can be covered with alumina paste. A mixture of alumina and borosilicate glass can be used for the low-temperature sintered ceramic, and alumina can be used for the high-temperature sintered ceramic.

  By using the same method, it is also possible to produce the same structure as in Examples 1 and 2 in which the frame 3 is made of a multilayer ceramic.

1 is a cross-sectional view of an electric double layer capacitor according to Example 1. FIG. 6 is a cross-sectional view of an electric double layer capacitor according to Example 2. FIG. 6 is a cross-sectional view of an electric double layer capacitor according to Example 3. FIG. 6 is a cross-sectional view of an electric double layer capacitor according to Example 4. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a, 1b ... Polarizable electrode 2 ... Separator 3 ... Frame body 3a, 3b, ..., 3f ... Ceramic layer 4a, 4b ... Current collector 5 ... Sealing plate 6a, 6b, 6c, 6d ... Terminal 7 ... Protection element 8 ... Temperature sensor

Claims (3)

An electrochemical device comprising a pair of electrodes, an electrolytic solution, and a container for containing the pair of electrodes and the electrolytic solution,
The container is composed of a concave frame and a sealing plate that seals the opening of the frame,
An electrochemical element, wherein an electronic element is embedded in the frame or the sealing plate.   The electrochemical element according to claim 1, wherein the frame body or the sealing plate in which the electronic element is embedded is made of a resin. The frame is configured by laminating a plurality of layers made of ceramic,
The electrochemical device according to claim 1, wherein the electronic device is disposed on a surface of the layer and is embedded in the frame body by sintering the frame body.

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