Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Shinsei Kagaku Kogyo Co., Ltd.

Fumio Daio

Hideo Kaiya

Akihiro Sano

Eiichi Tsuboka

Seiichi Mizutani

Munehisa Ikoma

Toshiyuki Shimizu

Naoto Arai

Kazunori Haraguchi

Ken Nishimura

Takeshi Inui

Shuichi Nishino

Masatsugu Kondo

Shusuke Oguro

Toru Oshima

Mitsugu Okahisa

Takayuki Tanahashi

Daisuke Yoshida

Yoshimitsu Kaneda

Hiroaki Yoshino

Tatsuya Hashimoto

Kenji Yoshida

Masao Nakamura

Koji Arai

Masahiko Yoshida

Shinji Tsurutani

Yoshinobu Morita

Satoshi Ogawa

Naoko Souma

Kenichi Nakatsu

Yukimasa Niwa

Kunihide Miura

Yoshiki Terao

Sakae Sadakuni

Norimasa Takahashi

Akira Iguchi

Kenichi Ohshima

Seiichi Mizuani

Norio Saito

Syunichi Tanoue

Masaki Kojima

Kazumitsu Jibiki

Seiichi Mitzutani

An authentication system determines if a counterfeit ineligible unit is installed in a main device. When connected with a battery pack, a notebook PC generates and combines a random number and a function determination signal using a signal combining unit and transmits same to the battery pack. A first function calculation unit calculates the function of the random number. The battery pack has a signal separation unit to separate the combined signal into the random number and function determination signal, and a second function calculation unit to calculate the function of the random number for transmitting back to the notebook PC. A comparison unit compares the calculation results by the first and second function calculation units to determine whether the connected battery pack is an authorized one and denies connection if the pack is an unauthorized one.

Authentication system

A current collector sheet for an electrode of an electrochemical device has a conductive area and an insulating area on the surface thereof. Examples of the current collector sheet includes: a current collector sheet including an insulating sheet, wherein the conductive area has a conductive layer formed on the surface of the insulating sheet, and the insulating area has an exposed portion of the insulating sheet; a current collector sheet including a conductive sheet, wherein the insulating area has an insulating layer formed on the surface of the conductive sheet, and the conductive area has an exposed portion of the conductive sheet; and a current collector sheet including a conductive sheet portion and an insulating sheet portion positioned flush with each other, wherein the conductive area has a surface of the conductive sheet portion, and the insulating area has a surface of the insulating sheet portion.

Current collector sheet and electrochemical device

An electrochemical device having an electrode plate assembly. The electrode plate assembly includes (a) at least one first electrode, (b) at least one second electrode, and (c) a separator interposed between the first electrode and the second electrode. The first electrode includes a first current collector sheet and at least one first electrode mixture layer carried thereon. The second electrode includes a second current collector sheet and at least one second electrode mixture layer carried thereon. At least one of the first current collector sheet and the second current collector sheet has a conductive area and an insulating area.

Electrochemical device and method for producing the same

An IC chip in an IC tag is provided with a voltage application terminal in connection with its internal circuit, and a high voltage or a reverse voltage is applied to the voltage application upon unlawful handling of the IC tag, so that the IC chip is electrically broken down. In this way, an IC tag installed in an item is prevented from being misused when the IC tag is no longer necessary or being removed for misuse.

Method of installing IC tag

IC tags are installed in rechargeable batteries and then information required for manufacturing control of the rechargeable batteries or information required to produce battery packs which use rechargeable batteries is recorded onto the IC tags. Allowing the information recorded onto the IC tags to be rewritten makes it possible to search for the causes of occurring problems as well as make the best use of improvements to the rechargeable batteries when information during use of the rechargeable batteries is recorded after the rechargeable batteries are manufactured and shipped.

Manufacturing control method for rechargeable battery

A battery pack includes an IC tag carrying predetermined information. The IC tag stops functioning when the battery pack is disassembled or modified so that recorded information cannot be read out, whereby an act of disassembling or modification is detected, connection of an unqualified battery pack to a loading device or charging device is prevented, and connection of a counterfeit is prevented.

Battery pack having IC tag for detecting modification

An electrochemical device having an electrode plate assembly that includes: (a) at least one first electrode; (b) at least one second electrode; and (c) a separator interposed between the first electrode and the second electrode, the electrode plate assembly including a PTC device. The use of the electrochemical device according to this invention makes it possible to efficiently manufacture secondary batteries with a simple structure, a high reliability and a high electrical capacity.

Electrochemical device

A method of attaching a battery cell in an apparatus acted upon by centrifugal force avoids an extreme decline in discharge capacity of the battery cell when acted upon by the centrifugal force. The battery, of the type including a positive polarity material and a negative polarity material which are placed in opposition in a thickness direction of a battery case with an intervening separator disposed therebetween, and a liquid electrolyte packed inside the battery case, is mounted in the apparatus, oriented such that a negative polarity material side of the battery cell faces generally in a direction in which the centrifugal force acts on the apparatus, and an angle of inclination of a thickness direction of the battery cell is within a range of 0 to about 60 degrees relative to the direction of the centrifugal force.

Method and device for mounting cell

A battery cell is attached in an apparatus loaded in a revolving body, etc., such that the negative electrode side of the battery cell is oriented, within a prescribed angular range, in the direction in which centrifugal force acts.

A battery has an organic electrolyte, a negative electrode having at least one metal out of alkaline metal and alkaline metal alloy, and a positive electrode including a conductive core having at least one metal out of porous metal plate and metal mesh, wherein an active material covers the core. At least a part of one side of the core is exposed from the active material at a position confronting the negative electrode, and the width of narrowest part of the metal is greater than the thickness of the negative electrode. In this constitution, the discharge reaction is delayed in the exposed portion of the core of the positive electrode. By this delay in discharge reaction, the electric connection of the negative electrode is maintained up to the end of discharge. Hence, voltage drop at the end of discharge is suppressed. As a result, the battery having an excellent discharge capacity up to the end of the discharge is obtained.

Exposed conductive core battery

A method for producing a sealing member for a battery includes integrally insert-molding a gasket on a peripheral edge of a metal sealing plate. The gasket is molded on the peripheral edge of the metal sealing plate by inserting the metal sealing plate between the female and male molds, the female mold having a concave surface conforming to the upper surface of the metal sealing plate and provided with a magnet or vacuum suction mouth to attract the metal sealing plate in its center, and the male mold having a surface conforming to the lower surface of the metal sealing plate, then injecting a molten resin into a cavity formed between the female mold and the male mold while pressing the female and male molds against each other by an elastic member.

Method for producing sealing member for battery

In a battery comprising a spirally wound electrode group, a lead plate drawn from one electrode of the electrode group and connected to the inner bottom surface of the battery case in electrically conducting relationship, and an insulating plate interposed between the lead plate and the electrode group, at least the bottom surface of the insulating plate is formed from a heat weldable material, and the lead plate is heat-welded to this heat weldable material. This construction not only serves to completely prevent accidental short-circuiting, but enables high-speed assembling of batteries.

Method of fabricating batteries having spirally wound electrodes

Growing community of inventors

Osaka, Japan

Fumio Daio