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AssigneesJapan Vilene Company, Ltd., Power Systems Co., Ltd.
InventorsFuminori Kimura, Takeshi Kobayashi, Kouji Kimura, Masahiko Shimizu
Estimating the term…
A process for manufacturing an electric double-layer capacitor with an excellent property of preventing a short circuit between the electrodes, a better ionic permeability and a high strength is provided, said process comprising using, as a separator, a fiber sheet containing a fiber having fibrils and a fine polyester fiber having a fineness of not more than 0.45 dtex (decitex) and drying the separator at a specific temperature.
A process for manufacturing an electric double-layer capacitor, including the steps of inserting an electrolyte and an electrode group assembled from a current collector electrode, an electrode and a separator into a case and sealing the case,
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
Characterised by their structure, e.g. multi-layered, porosity or surface features: arranged or disposed on a current collector; Layers or phases…
Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the…:…
Cases; Housings; Encapsulations; Mountings: fixing or assembling a capacitive element in a housing, e.g. mounting electrodes, current collectors…
Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation: energy storage using capacitors
Term ended 13 Nov 2021 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
The present invention relates to a process for manufacturing an electric double-layer capacitor.
An electric double-layer capacitor has a relatively high capacity; moreover, it has a long life and a capability of being quickly charged and discharged. Therefore, it has been used not only for conventional applications such as leveling of power sources and absorption of noises but also as a memory backup power source for personal computers as well as a supplement or substitute for secondary batteries. In recent years, it has been expected to be used as a secondary battery for electric automobiles.
This electric double-layer capacitor has such a structure that a pair of electrodes is dipped in an electrolyte solution. When a voltage is applied to this electric double-layer capacitor, ions having an opposite sign to an electrode will be distributed near the electrode to form a layer of the ions while charges having an opposite sign to the ion will be accumulated within the electrode. Then, when a load is placed across the electrodes, the charges within the electrode will be discharged and, at the same time, the ions distributed near the electrode will leave therefrom whereby a neutral state will return.
(Manufacture of the Separator)
Fibril fibers formed from para-type aromatic polyamide (Registered Trademark: KEVLAR, Du Pont; carbonizing temperature: not lower than 500° C.) and fine fibers formed from polyethylene terephthalate (fineness: 0.11 dtex, fiber length: 3 mm, melting temperature: 260° C., softening temperature: 253° C., cross section: circular) were prepared.
Next, a slurry containing the fibril fibers and the fine fibers at a mass ratio of 1:1 was formed and subjected to web-forming processes using an inclined wire type short net system to form a fiber web. Then this fiber web was dried by a hot-air circulating drier set to the temperature of 120° C. Thereafter, the dried fiber web was compressed (linear pressure: 4.7 kN/cm) by a pair of hot calenders set to the temperature of 220° C. to manufacture a compressed wet-laid nonwoven fabric (i.e. separator) having a weight per unit area of 20 g/m2, a thickness of 25 μm and an apparent density of 0.8 g/m3. The constituent fibril fibers for this separator contained the part where the fine fibers were in a bundle. Although the constituent fine fibers (formed from polyethylene terephthalate) for the separator were a bit adhered by pressure, they were thermally nonfused and, therefore, free from forming a coat.