Tdk Corporation

Yoshihiko Ohashi

Hidetake Itoh

Kazuo Katai

Hiroaki Hasegawa

Keita Kobayashi

Tetsuya Takahashi

Mitsuo Kougo

Yosuke Miyaki

Kazunori Yoshikawa

Yuji Yoshino

Kiyonori Hinoki

Atsuko Kosuda

Katsuo Naoi

Naoto Tsukamoto

Kenji Nishizawa

Kazuhiro Anai

Akio Yamanaka

An electrochemical device includes an element body, an exterior sheet, a seal part, and a leading terminal. The element body includes a pair of inner electrodes laminated to sandwich a separator sheet. The exterior sheet covers the element body. The seal part seals a peripheral part of the exterior sheet for immersing the element body in an electrolyte. The leading terminal extends outward from the seal part of the exterior sheet. The exterior sheet includes a front sheet and a back sheet. The front sheet includes a front-side metal sheet. The back sheet includes a back-side metal sheet.

Electrochemical device

An electrochemical device which includes: an element main body wherein a pair of internal electrodes are laminated so as to sandwich a separator sheet there between; an outer casing sheet that covers the element main body; sealing parts that hermetically seal the peripheral part of the outer casing sheet so that the element main body is immersed in an electrolyte solution; and lead terminals that are electrically connected to the internal electrodes respectively and are led out from the sealing parts of the outer casing sheet to the outside. A resin inner layer that is present in the inner surface of the outer casing sheet is provided with a fusion bonding part for separators, which partially bonds a part of the separator sheet to the inner surface of the outer casing sheet.

Electrochemical device and method for manufacturing same

An electrochemical device includes a wound laminated body with first and second electrodes, first and second separators, an electrolytic solution; and an outer package that houses the wound body and the electrolytic solution. The electrochemical device satisfies, at an outer end of the laminated body in a winding direction: the first and second separators protrude more outward in the winding direction than the second electrode; the first electrode protrudes more outward in the winding direction than the first and second separators; and an outer end of the first separator in the winding direction inclines toward a winding center and comes into contact with an upper surface of the second separator beyond the second electrode and an outer end of the first electrode in the winding direction inclines toward the winding center and comes into contact with the second separator and with the peripherally inner first electrode beyond the second electrode.

Electrochemical device and method for manufacturing electrochemical device

In an electrochemical device having an element main bodyA enclosed in an exterior packageB, a peripheral region of the exterior packageB is provided with an elastic structure or a plurality of elastic structures R, Rhaving an elastic force in a thickness direction (Z-axis direction) of films. Each of the elastic structures R, Rhas a first region of the exterior packageB folded along a film outer edge, and a second region of the exterior packageB opposed to the first region. Two ends R, R(R, R) of the first region in a direction along the film outer edge are in contact with the second region, and between the two ends R, R(R, R) there is a space (with a maximum height 2R) between the first region and the second region.

A leadof an electrochemical device includes a lead bodyA containing Al, and a bent metallic thin filmprovided to a tip part of the lead bodyA. The metallic thin filmincludes a thin film bodycontaining Ni, and a plating layercontaining Sn and covering at least an outer surface of the bent thin film body. A specific area of an inner surface of the bent thin film bodyand a surface of the lead bodyA are welded in a predetermined area without the plating layerbeing disposed there between.

Electrochemical device and manufacturing method thereof, circuit board and housing tray

An electric double layer capacitor comprising a plurality of electrode bodies comprising a positive electrode and a negative electrode laminated via a separator and being impregnated with an electrolyte solution, wherein the plurality of electrode bodies are electrically connected in series, the positive electrode and the negative electrode comprise an active material having pores, the electrolyte solution comprises an electrolyte having a cation and a counteranion of the cation, a ratio of an average pore diameter of the active material of the positive electrode to an ion diameter of the counteranion is in the range of 2.5 to 2.8, and a ratio of an average pore diameter of the active material of the negative electrode to an ion diameter of the cation is in the range of 1.65 to 1.85.

Electric double layer capacitor with non-equal areas of the active material layers of the positive electrode and the negative electrode

A lithium-ion secondary battery separator has a porous structure formed by laminating a second polymer layer, a first polymer layer, and a second polymer layer in sequence. The second polymer layer has a melting point lower than that of the first polymer layer. The second polymer layer has a higher molecular part formed on a side in contact with the first polymer layer and a lower molecular part formed on a side farther from the first polymer layer than is the higher molecular part. The higher and lower molecular parts have a weight-average molecular weight ratio (higher molecular part/lower molecular part) of 4 to 19 therebetween.

Lithium-ion secondary battery separator and lithium-ion secondary battery

A wound electrochemical device has a wound body formed by winding a multilayer member including a multilayer structure composed of a positive electrode, a separator, and a negative electrode; wherein each of the positive and negative electrodes, includes a structure having an active material layer formed on both sides of a current collector; wherein the wound body has a space at a center portion thereof; and wherein the smallest radius of curvature R of a curved part in an innermost circumferential portion of the wound body satisfies the following expression (1):=&#x3b1;&#xd7;(2)&#x2003;&#x2003;(1)where R is the smallest radius of curvature of the curved part in the innermost circumferential portion of the wound body (unit: &#x3bc;m), &#x3b1; is a value within the range of 3.33 to 7.12, Tis a thickness of the current collector of the electrode positioned at the innermost circumference of the wound body (unit: &#x3bc;m), and Tis a thickness of the active material layer of the electrode positioned at the innermost circumference of the wound body (unit: &#x3bc;m), Tbeing a value within the range of 8 to 30 (unit: &#x3bc;m).

Wound electrochemical device and method of manufacturing same

An electro-chemical device comprises a package including a metal film, a battery element sealed within the package, resin layers disposed at least on the inside of a seal part of the package, and a lead extending from the battery element to the outside of the package through between the resin layers at the seal part of the package. The lead has a special form into which the resin of the resin layers bites, so that the lead is firmly buried in the resin layers, whereby the lead is fully inhibited from moving. Therefore, an electro-chemical device having a high quality can be obtained.

Electro-chemical device and method for manufacturing the same

The electric double-layer capacitor has a portion where a thickness of a sealing member from a surface of an outer package to a surface of a lead in a laminating direction of electrode bodies on one side of the lead differs from that on the other side of the lead such that two leads connected to each electrode body are arranged within the same plane perpendicular to the laminating direction of the electrode bodies. The electrode bodies are laminated in the outer package such as to yield portions where only one of the planar leads of a first electrode body overlaps one of the planar leads of a second electrode body in the laminating direction of the electrode bodies in the opening part of the outer package.

Electric double-layer capacitor and method of manufacturing electric double-layer capacitor

The lithium-ion secondary battery has a portion where a thickness of a sealing member from a surface of an outer package to a surface of a lead in a laminating direction of electrode bodies on one side of the lead differs from that on the other side of the lead such that two leads connected to each electrode body are arranged within the same plane perpendicular to the laminating direction of the electrode bodies. The electrode bodies are laminated in the outer package such as to yield portions where only one of the planar leads of a first electrode body overlaps one of the planar leads of a second electrode body in the laminating direction of the electrode bodies in the opening part of the outer package.

Lithium-ion secondary battery and method of manufacturing lithium-ion secondary battery

In an electrochemical device comprising a multilayer body having a separator and a pair of electrodes disposed so as to hold the separator therebetween, and an electrolyte infiltrated in the multilayer body; the electrodes contain an active material particle; the separator is made of a nonwoven fabric having an average fiber diameter Df of 0.1 to 1.0 &#x3bc;m; T&#x2267;5 &#x3bc;m and T/Df&#x2267;20, where T is the thickness of the separator; and Dp&#x3c;T, where Dp is the average particle size of the active material particle.

An electrochemical device comprises collector plates having main parts and tab parts and being arranged such that the main parts oppose each other; a separator having a main part and a tab part and being arranged such that the main part is disposed between the main parts of the collector plates while the tab part projects out from between the main parts of the collector plates; an active material layer formed on each of the main parts of the collector plates and in contact with the separator; an electrolyte in contact with each active material layer; and an insulative fixing member securing the tab parts of the collector plates and the tab part of the separator to each other.

An electric double layer capacitor comprising a pair of electrodes and an electrolytic solution in contact with said pair of electrodes, wherein: the electrolytic solution contains a compound having the formula (1) and an organic solvent. Here, Ris a group selected from among dimethylene, trimethylene, tetramethylene and pentamethylene, and Ris tetramethylene or pentamethylene. 

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Tokyo, Japan

Yoshihiko Ohashi