Panasonic Corporation

Panasonic Intellectual Property Management Co., Ltd.

Matsushita Electric Industrial Co., Ltd.

Sanyo Electric Co., Ltd.

Panasonic Intellectual Property Mgmt Co., Ltd.

Yasutaka Kogetsu

Kazuyoshi Honda

Masaya Ugaji

Toshitada Sato

Hiroshi Yoshizawa

Nobuaki Nagao

Shuji Ito

Masaki Hasegawa

Keiichi Takahashi

Shinji Mino

Katsuhisa Wadasaki

Taisuke Yamamoto

Koki Inoue

Yuki Suehiro

Takaya Saito

Kazuya Iwamoto

Sadayuki Okazaki

Hidekazu Hiratsuka

Satoshi Shibutani

Keisuke Ohara

Yoshiyuki Ozaki

Akira Kakinuma

Teruhisa Miura

Katsumi Kashiwagi

Takuhiro Nishimura

Yuuko Ogawa

Takashi Takeuchi

Noriyuki Uchida

Masanori Sumihara

Yasuhiro Ueyama

Tsutomu Nishioka

Sumihito Ishida

Tatsuki Hiraoka

Kunihiko Bessho

Takashi Shimada

Suguru Matsumura

Nobuyuki Kirihara

Hitoshi Katayama

A winding-type battery includes a battery case, a power generating element, a cap for blocking an opening of the battery case, and a gasket for insulating the battery case from the cap. The power generating element includes a first electrode, a second electrode, a separator interposed between them, and an electrolyte. The first electrode and the second electrode are wound via the separator to form an electrode group, and the first electrode is connected to the cap via a first current collecting lead, and the second electrode is connected to the battery case via a second current collecting lead. A groove is formed near the opening end of the battery case. The gasket includes: an annular seal portion interposed between a rim of the cap and the region from the groove to the end; and a tubular portion that is integrated with the seal portion, and is disposed closer to the electrode group than the seal portion is. The first current collecting lead is connected to the cap through a hollow in the tubular portion.

Wound battery

A battery includes: an electrode group including a first electrode, a second electrode, and a separator interposed between the first electrode and the second electrode; an electrolyte; a container for accommodating the electrode group and the electrolyte; a sealing member for blocking an opening in the container; and a first lead for electrically connecting the first electrode to the sealing member. The first lead has a weld region welded to the sealing member, and the weld region has at least one first bump along the longitudinal direction of the first lead. The cross section of the boundary between the weld region and a non-weld region on the first electrode side has a projecting shape corresponding to the bump.

Battery with lead weld region bump

A winding-type battery includes a battery case, a power generating element, a cap for blocking an opening of the battery case, and a gasket for insulating the battery case from the cap. The first electrode is connected to the cap via a first current collecting lead, and the second electrode is connected to the battery case via a second current collecting lead. A groove is formed near the opening end of the battery case. The gasket includes: an annular seal portion interposed between a rim of the cap and the region from the groove to the end; and a tubular portion that is integrated with the seal portion, and is disposed closer to the electrode group than the seal portion is. The first current collecting lead is connected to the cap through a hollow in the tubular portion.

A winding-type battery includes an electrode group that is formed by winding a first electrode and a second electrode via a separator and has a first end surface and a second end surface. The first electrode includes a first current collector sheet, and a first active material layer formed on its surface. The second electrode includes a second current collector sheet, and a second active material layer formed on its surface. The first current collector sheet includes, at its end disposed on the first end surface of the electrode group, a first uncoated portion having no first active material layer on either surface thereof. An edge surface of the first uncoated portion is at least partially covered with an insulating layer, and an end of the insulating layer projects more than an end of the separator on the first end surface.

Battery having separator protection provided to electrode

A small cylindrical lithium-ion secondary battery provided with a safety mechanism that enables internal pressure to be released when an anomaly occurs. The battery includes an electrode group formed of a positive electrode and a negative electrode that are wound or stacked with a separator interposed therebetween, an electrolytic solution, a battery case that contains the electrode group and the electrolytic solution, and a sealing body. The battery case has an outer diameter of 10 mm or less. The sealing body includes a ring having a through-hole and includes a sheet-like or film-like valve member disposed such that the valve member covers the through-hole of the ring, and a safety mechanism that causes the valve member to cleave when the internal pressure reaches a predetermined pressure is disposed therein. The ring includes protrusions formed of linear ridge lines that protrude toward an inside of the through-hole.

Cylindrical lithium-ion secondary battery

A negative electrodefor lithium secondary batteries, which can increase the charge/discharge capacity of a lithium secondary battery, includes a negative electrode current collector, a negative electrode active material layer, and a lithium layer. The negative electrode active material layer is disposed on regions and of the respective surfaces and of the negative electrode current collector. The lithium layer is disposed on uncovered regions and, which are regions of the respective surfaces and of the negative electrode current collector on which the negative electrode active material layer is not disposed. The lithium layer includes lithium.

Negative electrode for lithium secondary batteries, lithium secondary battery, and method for producing the negative electrode for lithium secondary batteries

To improve high temperature storage characteristic of a non-aqueous electrolyte secondary battery suitable for high input/output application, the structure of a positive electrode active material is optimized. The non-aqueous electrolyte secondary battery includes a positive electrode; a negative electrode; a separator interposed between the positive and negative electrodes; and a non-aqueous electrolyte. The positive electrode active material includes secondary particles, each formed of an aggregate of primary particles. A value (V) defined by the formula: V=(1&#x2212;C/D)/(A&#xd7;B) is not less than 0.0005 and not greater than 0.04, where an average particle size of the primary particles is A &#x3bc;m, an average particle size of the positive electrode active material is B &#x3bc;m, a tap density of the positive electrode active material is C g/ml, and a true specific gravity of the positive electrode active material is D g/ml.

Non-aqueous electrolyte secondary battery

The present invention relates to a current collector including a base portion with a flat face, primary projections projecting from the flat face, and secondary projections projecting from the top of the primary projections. The present invention also relates to a current collector including a base portion with a flat face and primary projections projecting from the flat face, wherein the roughening rate of the top of the primary projections is 3 to 20. By using such a current collector, separation of the active material from the current collector can be inhibited when using an active material that has a high capacity but undergoes a large expansion at the time of lithium ion absorption.

Electrode, and current collector used therefor

In order to enhance charge and discharge efficiency and to improve cycle characteristics by increasing a facing area between a positive electrode active material and a negative electrode active material, in a negative electrode for lithium secondary battery having a current collector and an active material layer carried on the current collector, the active material layer includes a plurality of columnar particles. The columnar particles include an element of silicon, and are tilted toward the normal direction of the current collector. Angle &#x3b8; formed between the columnar particles and the normal direction of the current collector is preferably 10&#xb0;&#x2266;&#x3b8;&#x3c;90&#xb0;.

Lithium secondary battery

The negative electrode for a lithium secondary battery includes: a current collectorhaving a plurality of bumpson a surface thereof; a first active material layer formed on the current collector; and a second active material layerdisposed on the first active material layerand including a plurality of active material particles. Each of the plurality of active material particlesis located on a corresponding bumpof the current collector, and each of the first active material layerand the plurality of active material particleshas a chemical composition represented as SiO(0&#x3c;x&#x3c;1).

Negative electrode contacting silicon oxide active material layers for lithium secondary battery and method for producing the same

A negative electrode for a lithium secondary battery of the present invention includes a current collector and a negative electrode active material layer carried on the current collector. The negative electrode active material layer includes a plurality of columnar particles. The current collector has a surface including a depression and a plurality of projected regions defined by the depression. The projected regions carry the columnar particles. Further, the present invention relates to a lithium secondary battery using the foregoing negative electrode. According to the present invention, it is possible to provide a high-capacity negative electrode excellent mainly in cycle characteristics for a lithium secondary battery, and a lithium secondary battery including the same.

Negative electrode for lithium secondary battery, and lithium secondary battery including the same

This invention provides a negative electrode and a non-aqueous electrolyte secondary battery including the negative electrode. The negative electrode includes a Li-absorbing element as a negative electrode active material, is free from deformation, separation of the negative electrode active material layer from the negative electrode current collector, and deposition of lithium on the negative electrode current collector, and is excellent in cycle characteristic, large-current discharge characteristic, and low-temperature discharge characteristic. The negative electrode of this invention includes: a current collector having depressions and protrusions on a surface in the thickness direction thereof; and a negative electrode active material layer that includes a plurality of columns containing a negative electrode active material that absorbs and releases lithium ions, the columns being grown outwardly from the surface of the current collector. The negative electrode of this invention is characterized in that the columns are grown at an inclination angle relative to the direction perpendicular to the surface of the current collector, and that the inclination angle of the columns changes reversibly depending on absorption and release of lithium ions by the negative electrode active material.

Negative electrode for non-aqueous electrolyte secondary battery, method for producing the same, and non-aqueous electrolyte secondary battery

An electrode for a lithium secondary battery including a sheet-like current collector and an active material layer carried on the current collector. The active material layer is capable of absorbing and desorbing lithium, and the active material layer includes a plurality of columnar particles having at least one bend. An angle &#x3b8;formed by a growth direction of the columnar particles from a bottom to a first bend of the columnar particles, and a direction normal to the current collector is preferably 10&#xb0; or more and less than 90&#xb0;. When &#x3b8;is an angle formed by a growth direction of the columnar particles from an n-th bend counted from a bottom of the columnar particles to an (n+1)-th bend, and the direction normal to the current collector, and n is an integer of 1 or more, &#x3b8;is preferably 0&#xb0; or more and less than 90&#xb0;.

Electrode for lithium secondary battery, lithium secondary battery and method for producing the same

A negative electrode for a lithium ion secondary battery of the present invention includes a sheet-like current collector and an active material layer carried on the current collector. The current collector includes a substrate and a surface portion that undergoes plastic deformation more easily than the substrate. The surface portion has protrusions and recesses. The active material layer includes a plurality of columnar particles containing silicon. The columnar particles are carried on the surface portion.

Negative electrode for lithium ion secondary battery and lithium ion secondary battery including the same

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Osaka, Japan

Yasutaka Kogetsu