WO2010092944A1 - 電気化学セル、携帯電子機器、及び電気化学セルの製造方法 - Google Patents
電気化学セル、携帯電子機器、及び電気化学セルの製造方法 Download PDFInfo
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- WO2010092944A1 WO2010092944A1 PCT/JP2010/051862 JP2010051862W WO2010092944A1 WO 2010092944 A1 WO2010092944 A1 WO 2010092944A1 JP 2010051862 W JP2010051862 W JP 2010051862W WO 2010092944 A1 WO2010092944 A1 WO 2010092944A1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/08—Structural combinations, e.g. assembly or connection, of hybrid or EDL capacitors with other electric components, at least one hybrid or EDL capacitor being the main component
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/74—Terminals, e.g. extensions of current collectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/78—Cases; Housings; Encapsulations; Mountings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/78—Cases; Housings; Encapsulations; Mountings
- H01G11/80—Gaskets; Sealings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/116—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material
- H01M50/117—Inorganic material
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/116—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material
- H01M50/117—Inorganic material
- H01M50/119—Metals
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/147—Lids or covers
- H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
- H01M50/169—Lids or covers characterised by the methods of assembling casings with lids by welding, brazing or soldering
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2300/00—Electrolytes
- H01M2300/0017—Non-aqueous electrolytes
- H01M2300/0025—Organic electrolyte
- H01M2300/0045—Room temperature molten salts comprising at least one organic ion
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Definitions
- the present invention relates to an electrochemical cell such as a nonaqueous electrolyte battery and an electric double layer capacitor.
- the conventional electrochemical cell has a coin-like shape for crimping and sealing the battery can. Since it has a coin shape, the mounting area cannot be utilized effectively, which has been a factor that hinders space saving. Further, in order to perform reflow soldering, it is necessary to weld terminals and the like to the case in advance, which increases costs in terms of an increase in the number of parts and an increase in manufacturing man-hours.
- a metal ring is provided on the upper end surface of a concave container, covered with a bonding material, and a sealing plate plated with the bonding material and a metal ring-shaped bonding material are provided. Joined by welding.
- the object of the present invention is to provide an electrochemical cell that solves the above-mentioned problems and can be sealed without causing cracks in a concave container by short-time welding.
- the thermal shock applied to the concave container can be reduced and the occurrence of cracks can be prevented.
- the present invention has been found that by adding phosphorus to nickel plating, welding can be performed quickly and uniformly even if the welding power is small.
- the electrochemical cell according to the present invention accommodates a plurality of electrodes composed of a positive electrode and a negative electrode, a separator positioned between the electrodes, and an electrolytic solution, and is electrically connected to either the positive electrode or the negative electrode, respectively.
- a concave container having a pair of connection terminals on the outer bottom surface; a nickel plating layer on a surface joined to the concave container; a sealing plate for sealing the concave container; and an upper end surface of the concave container;
- a metal ring having a nickel plating layer on a surface to be bonded to the plate, and a bonding layer made of a nickel alloy containing phosphorus and bonding the metal ring and the sealing plate.
- the amount of phosphorus contained in both or one of the nickel plating layer provided on the metal ring and the nickel plating layer provided on the sealing plate is 3. To 12% by mass, preferably 5 to 12% by mass, more preferably 5 to 10% by mass. If the amount of phosphorus contained in the nickel plating layer is within these ranges, cracks occurring in the concave container can be more reliably prevented.
- the amount of phosphorus contained in the bonding layer is 2 to 10% by mass, preferably 3 to 10% by mass, more preferably 5 to 8% by mass. It is characterized by being. If the amount of phosphorus contained in the bonding layer is within these ranges, cracks generated in the concave container can be more reliably prevented.
- the amount of phosphorus contained in either or both of the nickel plating layer provided on the metal ring and the nickel plating layer provided on the sealing plate is 5. To 12% by mass.
- the electrochemical cell according to the present invention is characterized in that the nickel plating layer of one or both of the metal ring and the sealing plate is formed by electroless plating or electrolytic plating.
- the electrochemical cell according to the present invention is characterized in that the concave container is made of ceramics.
- the electrochemical cell according to the present invention is characterized in that the concave container is made of alumina.
- the electrochemical cell according to the present invention is characterized in that the electrolytic solution contains either propylene carbonate or sulfolane. According to this structure, there is little change of the electrolyte solution by welding heat.
- the electrochemical cell according to the present invention is characterized in that the electrolyte contains at least one of dimethyl carbonate, methyl propionate, and ethyl methyl sulfolane. According to this structure, there is little change of the electrolyte solution by welding heat.
- the nickel plating layer provided on the metal ring and the nickel plating layer provided on the sealing plate or phosphorus contained in one of the nickel plating layers is a nickel plating layer. It is characterized by being contained in a large amount on the surface of. According to this configuration, the welding time can be shortened even when the welding heat is low.
- the electrochemical cell according to the present invention is a portable electronic device equipped with the electrochemical cell according to any one of claims 1 to 15. According to this configuration, since a rectangular parallelepiped capacitor can be reflow mounted, a portable electronic device having a high mounting density can be manufactured.
- the method for producing an electrochemical cell comprises a pair of electrodes comprising a positive electrode and a negative electrode, a separator positioned between the electrodes and an electrolyte, and either the positive electrode or the negative electrode on the outer bottom surface.
- a step of housing in a concave container having a pair of connection terminals electrically connected to each other, a sealing plate having a nickel plating layer on a surface joined to the concave container and sealing the concave container, and an upper surface of the concave container A joining step of joining a metal ring having a nickel plating layer to a face on a side to be joined to the sealing plate provided on an end face, and forming a joining layer made of a nickel alloy containing phosphorus. . According to this configuration, the welding time can be shortened even when the welding heat is low. For this reason, the crack which arises in a concave container can be prevented.
- the manufacturing method of the electrochemical cell according to the present invention includes the amount of phosphorus contained in at least one nickel plating layer of the nickel plating layer provided on the metal ring and the nickel plating layer provided on the sealing plate. Is 5 to 12% by mass.
- the method for producing an electrochemical cell according to the present invention is characterized in that the amount of phosphorus contained in the bonding layer is 3% by mass to 10% by mass.
- the welding temperature at the time of sealing the electrochemical cell can be made lower than before. For this reason, even if welding heat is low, welding time can be shortened and the crack which arises in a concave container can be prevented. According to the present invention, the reliability of the sealing can be improved, and a highly reliable electrochemical cell can be provided.
- FIG. 1 is a cross-sectional view of a nonaqueous electrolyte battery or electric double layer capacitor of the present invention which is a rectangular parallelepiped.
- the concave container 101 has a rectangular parallelepiped shape having a concave portion.
- a positive electrode active material 106, a negative electrode active material 107, a separator 105, and an electrolytic solution (not shown) are accommodated in the recess.
- the positive electrode active material 106 and the negative electrode active material 107 are separated and stored by a separator 105.
- the positive electrode active material 106 is fixed to the current collector 113 with a conductive adhesive A1111.
- the negative electrode active material 107 is fixed to the nickel plating layer B1082 on the sealing plate 102 with a conductive adhesive B1112.
- the simple term “positive electrode” refers to the positive electrode active material 106.
- the negative electrode active material 107 is referred to.
- a metal ring 109 is formed on the upper end surface of the concave container 101.
- the upper surface of the metal ring 109 is covered with a nickel plating layer A1081.
- the sealing plate 102 that seals the concave container 101 has a nickel plating layer B1081 on the surface on the joining side.
- the bonding layer 112 is generated between the nickel plating layer A1081 connection layer and the nickel plating layer B1082.
- the outer periphery of the sealing plate 102 is larger than the inner periphery of the upper end portion of the concave container 101 and smaller than the outer periphery. In this case, the joint 112 is melted to the outer peripheral edge of the sealing plate 102 during welding.
- This concave container 101 is made of ceramics.
- the concave container 101 is formed by stacking green sheets, printing tungsten on the concave container, and baking it. By firing a laminate of green sheets printed with tungsten, the connection terminals A103 and B104 are formed.
- a Kovar metal ring 109 is brazed to the upper end surface of the concave container 101.
- the Kovar of the present embodiment described below is an alloy composed of Co: 17% by mass, Ni: 29% by mass, and Fe: balance.
- the surface of connection terminal A103 and connection terminal B104 has nickel plating and gold plating.
- nickel plating containing phosphorus is applied to the upper portion of the metal ring 109 to form a nickel plating layer 1081. In order to prevent oxidation, the surface of the nickel plating layer 1081 may be plated with gold.
- a metal ring was disposed on the edge of the upper end surface of the concave container 101.
- This metal ring is made of an alloy such as Kovar.
- the surface of the metal ring opposite to the concave container 101 is covered with a nickel plating layer A1081.
- the thickness of the metal layer including the metal ring 109 and the nickel plating layer A 1081 is thinner than the total thickness of the negative electrode active material 107 and the separator 105.
- the thickness of the metal layer is larger than the total thickness of the negative electrode active material 107 and the separator 105, the metal layer and the positive electrode active material 106 come into contact with each other, and the metal layer does not function as a nonaqueous electrolyte battery or an electric double layer capacitor. there is a possibility.
- connection terminal A103 penetrates the side wall surface from the bottom surface of the concave portion inside the concave container 101, and is formed from the side portion outside the concave container to the bottom portion.
- the connection terminal A103 is fixed to the inner bottom portion of the concave container 101.
- the current collector 113 is fixed to the inner bottom portion of the concave container 101 so as to cover the inner bottom surface of the concave container 101 and the connection terminal A103.
- the current collector 113 and the positive electrode active material 106 are fixed by a conductive adhesive A1111.
- connection terminal B104 extends from the outer bottom surface of the concave container 101 to the metal ring 109, and the connection terminal B104 and the metal ring 109 are electrically connected.
- the connection terminal A and the connection terminal B reach the bottom surface on the outer side of the concave container. However, even if the connection terminal A and the connection terminal B are stopped on the side surface of the container, they can be soldered to the substrate by wetting with the solder.
- a current collector made of tungsten is provided on the inner bottom surface of the concave container. This current collector is electrically connected to a connection terminal A103 penetrating the concave container wall surface. This current collector is formed by printing tungsten on a green sheet.
- the current collector located inside the concave container 101 is preferably coated with a valve metal such as aluminum in order to prevent corrosion.
- the current collector and the positive electrode active material 106 are bonded with a conductive adhesive 1111 containing carbon. The current collector and the positive electrode active material 106 are not necessarily bonded, and the positive electrode active material 106 may be simply placed on the current collector.
- the surface of the sealing plate 102 on the side of the concave container 101 is plated with nickel containing phosphorus to form a nickel plating layer B1082.
- the sealing plate 102 and the negative electrode active material 107 are bonded in advance with a conductive adhesive B1112 containing carbon.
- the positive electrode active material 106, the negative electrode active material 107, the separator 105, and an electrolyte are accommodated in the concave container 101, covered with a sealing plate 102, and then welded.
- This method provides a highly reliable seal.
- the nickel plating layer A 1081 on the metal ring and the nickel plating layer 1082 on the sealing plate are melted to form a bonding layer.
- This bonding layer is formed of a nickel alloy containing phosphorus.
- This bonding layer is formed by bonding a sealing plate and a concave container.
- the melting point of nickel is 1453 ° C., but the melting point can be lowered by adding phosphorus to nickel. Moreover, welding temperature can also be lowered
- electrolytic plating As a method for forming the nickel plating layer containing phosphorus, electrolytic plating or electroless plating can be used.
- electroless plating phosphorus can be contained from sodium hypophosphite used as a reducing agent.
- electrolytic plating a nickel plating layer containing phosphorus can be formed from a nickel plating bath containing phosphorous acid and phosphoric acid.
- the nickel plating layer A 1081 and the nickel plating layer B 1082 are formed by electroless plating.
- the method for producing the nickel plating layer containing phosphorus is not particularly limited, but it is preferably formed by electroless plating. This is because in electroless plating, the plating layer can easily contain phosphorus.
- the melting point of the surface of the nickel plating layer can be made lower than the inside.
- the phosphorus concentrations in the nickel plating applied to the metal ring 109 and the sealing plate 102 are different, both are easily melted, and highly reliable welding is possible.
- the melting point of the nickel compound Ni 3 P containing phosphorus is about 965 ° C. It can be seen that the film after plating is a microcrystal close to amorphous according to X-ray diffraction. From this, it is considered that phosphorus is segregated in the vicinity of the grain boundary. For this reason, the melting point of the nickel plating film containing phosphorus is considered to be 965 ° C. or lower.
- the phosphorus contained in the nickel plating layer A 1081 and the nickel plating layer B 1082 is preferably 5 to 12% by mass.
- the more phosphorus contained in the nickel the lower the welding temperature.
- the nickel plating layer preferably contains 5% or more of phosphorus. Even if the phosphorus content is 3 to 12% by mass, the welding temperature can be lowered and welding can be performed. When the phosphorus content of the nickel plating layer is 3% or less, the melting point cannot be lowered sufficiently to prevent cracks.
- the amount of phosphorus contained in nickel is too large, a large amount of Ni 3 P is generated in the joining layer by welding. If 10 mass% or more of phosphorus remains in the bonding layer, a large amount of Ni 3 P is generated, and the composition of the bonding layer becomes nonuniform. Thereby, the strength of the bonding layer portion is lowered. For this reason, it is preferable that phosphorus content of a joining layer will be 10 mass% or less.
- the nickel plating layer has 5% phosphorus, the phosphorus content in the bonding layer is about 3% by mass. Even if the phosphorus content of the bonding layer is 2%, it is possible to bond without causing cracks. However, in order to bond more reliably, the phosphorus content of the bonding layer must be 3% or more. preferable. Furthermore, if the phosphorus content of the bonding layer is 5% or more, bonding can be performed more reliably.
- the content of phosphorus contained in the nickel plating layer A 1081 and the nickel plating layer B 1082 is preferably 12% by mass or less. If the content of phosphorus contained in the nickel plating layer is 12% by mass, phosphorus is sublimated by welding heat, so the content of phosphorus contained in the joining layer is 10% by mass or less. More preferably, the content of phosphorus contained in the nickel plating layer is 10% by mass. The phosphorus contained in the bonding layer may be 8% by mass.
- nickel containing phosphorus As a method of forming nickel containing phosphorus, electrolytic plating or electroless plating can be used.
- electroless plating P can be contained from sodium hypophosphite used as a reducing agent.
- nickel plating containing phosphorus In electroplating, nickel plating containing phosphorus can be formed from a nickel plating bath containing phosphorous acid and phosphoric acid.
- the concave container 101 used in the present embodiment is made of ceramic. In particular, considering the cost and formability, the product made of alumina is good.
- the alumina concave container 101 can be manufactured by laminating and baking alumina green sheets and conductor printing.
- the material of the metal ring 109 is preferably a material whose thermal expansion coefficient is close to that of the concave container 101.
- the metal ring preferably uses Kovar having a thermal expansion coefficient of 5.2 ⁇ 10 ⁇ 6 / ° C.
- the current collector 113 formed on the inner bottom surface of the concave container 101 is preferably tungsten. In addition, palladium, silver, platinum, or gold can be used for the current collector 113.
- the current collector 113 is preferably covered with a valve metal such as aluminum or titanium, carbon, or the like. Thus, by covering with a valve metal having a high withstand voltage, the current collector can be prevented from being dissolved when a positive potential is applied.
- the current collector 113 can also be formed by vapor deposition, thermal spraying, or plating from a room temperature molten salt (butylpidium chloride bath, imidazolium chloride bath). Furthermore, in order to improve the electrical connection between the electrode and the current collector 113, it is effective to use a conductive adhesive A1111 containing carbon.
- connection terminals A103 and B104 it is preferable to provide nickel, gold, tin, and solder layers on the surface of the connection terminals A103 and B104 in contact with the mounting substrate in order to improve solderability.
- ⁇ Seam welding using the resistance welding method can be used for welding the joining layer.
- the nickel plating layer melts and can be welded by the principle of resistance welding.
- the electrochemical cell of the present invention can also be configured using a separator using a heat-resistant resin or glass fiber.
- Example 1 was produced using the storage container shown in FIG.
- the concave container 101 is made of alumina and has a size of 3.2 ⁇ 2.5 ⁇ 0.9 mm.
- the depth of the dent of the concave portion was 0.4 mm, and the size was 2.4 ⁇ 1.7 mm.
- the connection terminal A, the connection terminal B, and the current collector were formed by performing gold plating on the surface of the tungsten layer.
- As the sealing plate 102 a Kovar plate having a thickness of 0.1 mm and a nickel plating layer containing 3% by mass of phosphorus with a thickness of about 5 ⁇ m was used.
- As the metal ring 109 of the concave container 101 a metal plating layer containing 3% by mass of phosphorus and having a thickness of about 5 ⁇ m was used.
- activated carbon (specific surface area 2260 m 2 / g) added with carbon black as a conductive agent and formed into a sheet with a Teflon (registered trademark) binder as a binder was used. This sheet was cut into a positive electrode active material 106 and a negative electrode active material 107.
- As the electrolytic solution a solution of 1 mol / L of (CH 3 ) (C 2 H 5 ) 3 NBF 4 dissolved in propylene carbonate was used.
- a separator 105 made of Teflon (registered trademark) was used.
- the positive electrode active material 106 was adhered to the bottom surface of the concave container 101 with a conductive adhesive A1111.
- a negative electrode active material 107 was also bonded to the sealing plate 102 with a conductive adhesive 1112. Thereafter, the positive electrode active material 106 and the negative electrode active material 107 were dried at 250 ° C.
- the dried separator 105 was placed on the positive electrode active material 106 in the concave container 101, and the electrolytic solution was dropped into the concave container 101.
- the sealing plate 102 was placed on the opening of the concave container 101, and the metal ring 109 provided on the upper end of the concave container and the sealing plate 102 were resistance welded.
- Example 2 was prepared by setting the phosphorus content of the nickel plating layer disposed on both the metal ring 109 and the sealing plate 102 to 5 mass%. Other manufacturing conditions are the same as in Example 1.
- Example 3 was manufactured by setting the phosphorus content of the nickel plating layer disposed on both the metal ring 109 and the sealing plate 102 to 8 mass%. Other manufacturing conditions are the same as in Example 1.
- Example 4 was prepared by setting the phosphorus content of the nickel plating layer disposed on both the metal ring 109 and the sealing plate 102 to 10 mass%. Other manufacturing conditions are the same as in Example 1.
- Example 5 was manufactured by setting the phosphorus content of the nickel plating layer disposed on both the metal ring 109 and the sealing plate 102 to 12 mass%. Other manufacturing conditions are the same as in Example 1.
- Example 6 was prepared by setting the phosphorus content of the nickel plating layer disposed on both the metal ring 109 and the sealing plate 102 to 15 mass%. Other manufacturing conditions are the same as in Example 1.
- the nickel plating layer B1082 of the sealing plate 102 was formed with a thickness of about 5 ⁇ m without containing phosphorus.
- a nickel plating layer A1081 containing 10% by mass of phosphorus was formed with a thickness of about 5 ⁇ m.
- Other configurations and the sealing method are the same as those in the first embodiment.
- Nickel plating layer B1082 of sealing plate 102 contained 10% by mass of phosphorus and was formed with a thickness of about 5 ⁇ m. On the metal ring 109, a nickel plating layer A1081 containing no phosphorus was formed to a thickness of about 5 ⁇ m.
- Other configurations and the sealing method are the same as those in the first embodiment.
- Comparative Example 1 Both the metal ring 109 and the sealing plate 102 were subjected to nickel plating not containing phosphorus to produce Comparative Example 1.
- the welding power in Examples 1 to 6 and Comparative Example 1 was measured.
- the welding power is determined by the applied voltage, current, and time, and is a value that does not cause cracks in the concave container 101 and eliminates an unwelded portion.
- the lowest welding power at which there is no unwelded portion when phosphorus is not contained in both the nickel plating layer A 1081 and the nickel plating layer B 1082 is 100%, and the welding power in each example is shown in FIG.
- FIG. 2 is a table showing the relationship between the phosphorus content in the nickel plating layer and the welding power.
- FIG. 3 is a graph of the results of FIG. In the graph of FIG. 3, the horizontal axis represents the mass% of phosphorus contained in the nickel plating, and the vertical axis represents the relative welding power.
- Example 1 From the experimental results of Example 1, the welding power is reduced by about 2% even if only 3% by mass of phosphorus is contained in the nickel plating. Further, the welding power decreases as the phosphorus content in the nickel plating increases. The welding power of Example 6 having the largest phosphorus content in nickel plating is about 82%. From these experimental results, it can be said that if the nickel plating contains phosphorus, the welding power decreases.
- the welding power is preferably 95% or less. If the welding power is greater than 95%, cracks are generated in the ceramic concave container 101 with a probability of 0.2 to 2.3%. For this reason, the crack which arises in a concave container can be prevented efficiently by reducing welding power to 95% or less.
- the phosphorus content of the bonding layer 112 formed by melting the nickel plating layer A 1081 and the nickel plating layer B 1082 is preferably 10% by mass or less. If more than 10% by mass of phosphorus remains in the bonding layer 112, a large amount of Ni 3 P is generated and the composition becomes nonuniform. For this reason, the mechanical strength of the bonding layer is lowered.
- the content of phosphorus present in the nickel plating before welding is preferably 12% by mass or less. This is because if the amount of phosphorus contained in the nickel plating is about 12% by mass, the content of phosphorus after welding is preferably 10% by mass or less.
- the phosphorus content of the nickel plating layer A 1081 and the nickel plating layer B 1082 may be different.
- the cross section of the electrochemical cell after welding was observed, it was found that the nickel plating layer on the metal ring was greatly melted. For this reason, phosphorus may be contained only in the nickel plating layer formed on the metal ring. This is because the welding power can be reduced if phosphorus is contained in the nickel plating layer on the metal ring that is easily subjected to welding heat.
- Example 7 the nickel plating layer B1082 does not contain phosphorus, and the content of phosphorus in the nickel plating layer A1081 is 10% by mass. Even in this example, the welding power could be reduced to about 90% compared to the case without phosphorus.
- Example 7 When the welded part of Example 7 was cut and cross-sectional observation was performed with a 1000 ⁇ optical microscope, the nickel plating layer 1081 containing 10% by mass of phosphorus was dissolved, but the nickel plating layer 1082 containing no phosphorus was It was not dissolved.
- Example 8 the content of phosphorus in the nickel plating layer B1082 is 10% by mass, and the nickel plating layer A1081 does not contain phosphorus. Also in this example, as in Example 7, the welding power could be reduced to about 90% compared to the case without phosphorus.
- the phosphorus content is preferably 5 to 12% by mass.
- the electrochemical cell according to the present invention can be used as a primary battery, a secondary battery, and a capacitor. Furthermore, since the mounting area of the electrochemical cell according to the present invention is smaller than that of a coin-type electrochemical cell, the electrochemical cell is used as an electrochemical cell for portable electronic devices. In particular, it is useful to use it as a capacitor in a portable electronic device.
Abstract
Description
本実施例に用いられる凹状容器101は、セラミック製である。特に、コストおよび成形性を考慮するとアルミナ製が良好である。アルミナ製の凹状容器101は、アルミナのグリーンシートと導体印刷により積層し、焼成して製造することができる。
金属リング109および封口板102の両方に、リンを含まないニッケルめっきを施し比較例1を作製した。
102 封口板
103 接続端子A
104 接続端子B
105 セパレータ
106 正極活物質
107 負極活物質
1081 ニッケルめっき層A
1082 ニッケルめっき層B
109 金属リング
1111 導電性接着剤A
1112 導電性接着剤B
112 接合層
113 集電体
Claims (18)
- 正極および負極からなる複数の電極と前記電極の間に位置するセパレータと電解液とを収納し、前記正極及び前記負極のどちらか一方と電気的にそれぞれ接続した一対の接続端子を外側底面に有する凹状容器と、
前記凹状容器と接合する面にニッケルめっき層を有し、前記凹状容器を密閉する封口板と、
前記凹状容器の上端面に設けられ、前記封口板と接合する側の面にニッケルめっき層を有する金属リングと、
前記金属リングと前記封口板とを接合し、リンを含有するニッケル合金からなる接合層と、
を有する電気化学セル。 - 前記金属リングに設けられたニッケルめっき層と前記封口板とに設けられたニッケルめっき層の双方または一方のニッケルめっき層に含まれるリンの量が、3から12質量%である請求項1に記載の電気化学セル。
- 前記金属リングに設けられたニッケルめっき層と前記封口板とに設けられたニッケルめっき層の双方または一方のニッケルめっき層に含まれるリンの量が、5から12質量%である請求項1に記載の電気化学セル。
- 前記金属リングに設けられたニッケルめっき層と前記封口板とに設けられたニッケルめっき層の双方または一方のニッケルめっき層に含まれるリンの量が、5から10質量%である請求項1に記載の電気化学セル。
- 前記接合層に含まれるリンの量が2質量%から10質量%である請求項1から請求項4のいずれか一項に記載の電気化学セル。
- 前記接合層に含まれるリンの量が3質量%から10質量%である請求項1から請求項4のいずれか一項に記載の電気化学セル。
- 前記接合層に含まれるリンの量が5質量%から8質量%である請求項1から請求項4のいずれか一項に記載の電気化学セル。
- 前記金属リングに設けられたニッケルめっき層と前記封口板とに設けられたニッケルめっき層の双方または一方のニッケルめっき層に含まれるリンの量が、5から12質量%である請求項1から請求項7のいずれか一項に記載の電気化学セル。
- 前記金属リング及び前記封口板の一方または双方の前記ニッケルめっき層が、無電解めっきまたは電解めっきにより形成されている請求項1から請求項8のいずれか一項に記載の電気化学セル。
- 前記凹状容器がセラミックス製である請求項1から請求項9のいずれか一項に記載の電気化学セル。
- 前記凹状容器がアルミナ製である請求項1から請求項9のいずれか一項に記載の電気化学セル。
- 前記電解液がプロピレンカーボネートもしくはスルフォランのいずれか一方を含む請求項1から請求項11のいずれか一項に記載の電気化学セル。
- 前記電解液が、少なくともジメチルカーボネート、プロピオン酸メチル、エチルメチルスルフォランのいずれか一種類を含む請求項1から請求項12のいずれか一項に記載の電気化学セル。
- 前記金属リングに設けられたニッケルめっき層と前記封口板とに設けられたニッケルめっき層の双方または一方のニッケルめっき層に含まれるリンが、ニッケルめっき層の表面に多く含まれることを特徴とする請求項1から請求項13にいずれか一項に記載の電気化学セル。
- 請求項1から請求項14にいずれか一項に記載の電気化学セルを搭載した携帯電子機器。
- 正極および負極からなる一対の電極と前記電極の間に位置するセパレータと電解液とを、外側底面に前記正極及び前記負極のどちらか一方と電気的にそれぞれ接続した一対の接続端子を有する凹状容器に収納する工程と、
前記凹状容器と接合する面にニッケルめっき層を有し前記凹状容器を密閉する封口板と、前記凹状容器の上端面に設けられ前記封口板と接合する側の面にニッケルめっき層を有する金属リングとを接合し、リンを含有するニッケル合金からなる接合層を生成する接合工程と、
を有する電気化学セルの製造方法。 - 前記金属リングに設けられたニッケルめっき層と前記封口板とに設けられたニッケルめっき層の少なくとも一方のニッケルめっき層に含まれるリンの量が、5から12質量%である請求項16に記載の電気化学セルの製造方法。
- 前記接合層に含まれるリンの量が3質量%から10質量%である請求項16または請求項17に記載の電気化学セルの製造方法。
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Cited By (6)
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JP2010186691A (ja) * | 2009-02-13 | 2010-08-26 | Seiko Instruments Inc | 電気化学セル |
JP2011204487A (ja) * | 2010-03-25 | 2011-10-13 | Seiko Instruments Inc | 電気化学素子 |
CN102683030A (zh) * | 2011-03-18 | 2012-09-19 | 太阳诱电株式会社 | 电化学装置 |
JP2013077486A (ja) * | 2011-09-30 | 2013-04-25 | Kyocera Corp | 二次電池 |
JP2013251421A (ja) * | 2012-06-01 | 2013-12-12 | Seiko Instruments Inc | 電子部品、及び電子装置 |
US11830672B2 (en) | 2016-11-23 | 2023-11-28 | KYOCERA AVX Components Corporation | Ultracapacitor for use in a solder reflow process |
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JPWO2010092944A1 (ja) | 2012-08-16 |
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CN102308413B (zh) | 2014-06-18 |
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