Panasonic Intellectual Property Management Co., Ltd.

Panasonic Corporation

Matsushita Electric Industrial Co., Ltd.

Fumio Kato

Jun Nunome

Kohji Yuasa

Futoshi Tanigawa

Akira Kakinuma

Keisuke Yoneda

Yasushi Nakamura

Yoshitaka Dansui

Kiyoshi Hayashi

Hideaki Ohyama

Shinichi Sumiyama

Akiko Okabe

Shigeto Noya

Harunari Shimamura

Toshiyuki Shimizu

Tatsuhiko Suzuki

Yasuo Mukai

Katsuya Sawada

Yusuke Fukumoto

Yasuhiko Bito

Hizuru Koshina

Shozo Fujiwara

Hiroki Takeshima

Masumi Katsumoto

Hidekatsu Izumi

Takafumi Oura

Kenichi Morigaki

Keiko Kosuge

Tadaya Okada

Kenji Suzuki

Yuji Mototani

Shinichiro Tahara

Norihiro Yamamoto

Yusuke Kawahara

Fumiharu Sakashita

Isamu Saruwatari

Machiko Tsukiji

Yoshiki Fukuhara

A lithium primary cell includes an electrode group and a non-aqueous electrolytic solution. The electrode group includes a positive electrode, a negative electrode, and a separator, in which the positive electrode and the negative electrode are wound with the separator interposed therebetween. In the electrode group, an area where the positive electrode and the negative electrode face each other is 250 cmor more and 350 cmor less. The positive electrode includes a positive electrode mixture including manganese dioxide and a boron compound. The negative electrode includes lithium metal or a lithium alloy. The non-aqueous electrolytic solution includes ethylene carbonate. A content of the boron compound in the positive electrode is 0.5 parts by mass or more and 2 parts by mass or less in terms of boron with respect to 100 parts by mass of the positive electrode mixture. A content of the ethylene carbonate in the non-aqueous electrolytic solution is 1 part by mass or more and 10 parts by mass or less with respect to 100 parts by mass of the manganese dioxide.

Lithium primary cell with a positive electrode including manganese dioxide and a boron compound

Provided is an electrode alloy powder that is useful to obtain a nickel-metal hydride storage battery having a high battery capacity and a reduced self-discharge. The alloy powder is: a mixture including particles of a first hydrogen storage alloy having an AB-type crystal structure, and particles of at least one second hydrogen storage alloy selected from the group consisting of a hydrogen storage alloy a having an AB-type crystal structure and a hydrogen storage alloy b having an AB-type crystal structure, wherein an amount of the first hydrogen storage alloy included in the mixture is greater than 50 mass %.

Electrode alloy powder, negative electrode for nickel-metal hydride storage batteries using the same, and nickel-metal hydride storage battery

A positive electrode for alkaline storage batteries that enables to improve the active material utilization rate, while suppressing the self-discharge. The positive electrode for alkaline storage batteries includes a support having conductivity, and a positive electrode active material adhering to the support. The positive electrode active material includes particles of a nickel oxide. The particles of the nickel oxide include a first particle group having a particle diameter of 20 &#x3bc;m or more, and a second particle group having a particle diameter of less than 20 &#x3bc;m. The first particle group includes a first component with cracks, and a second component without cracks. The proportion of the first particle group in the particles of the nickel oxide is 15 vol % or more, and the proportion by number of the first component in the first particle group is 15% or more.

Positive electrode for alkaline storage batteries and alkaline storage battery

Disclosed is an alloy powder for electrodes for nickel-metal hydride storage batteries having a high battery capacity and being excellent in life characteristics and high-temperature storage characteristics. The alloy powder includes a hydrogen storage alloy containing elements L, M, Ni, Co, and E. L includes La as an essential component. L includes no Nd, or when including Nd, the percentage of Nd in L is less than 5 mass %. The percentage of La in the hydrogen storage alloy is 23 mass % or less. M is Mg, Ca, Sr and/or Ba. A molar ratio &#x3b1; to a total of L and M is 0.045&#x2264;&#x3b1;&#x2264;0.133. A molar ratio x of Ni to the total of L and M is 3.5&#x2264;x&#x2264;4.32, and a molar ratio y of Co is 0.13&#x2264;y&#x2264;0.5. The molar ratios x and y, and a molar ratio z of E to the total of L and M satisfy 4.78&#x2264;x+y+z&#x3c;5.03.

Alloy powder for electrodes, negative electrode for nickel-metal hydride storage batteries including the same, and nickel-metal hydride storage battery including the same

Provided is an alloy powder for an electrode which enables an alkaline storage battery to have both excellent discharge characteristics and excellent life characteristics. The alloy powder includes a hydrogen storage alloy including an element L, Mg, Ni, Al, and an element M. The element L is at least one selected from the group consisting of group 3 elements and group 4 elements of the periodic table (excluding Y). The element Mis at least two selected from the group consisting of Ge, Y, and Sn. A molar proportion x of Mg in a total of the element L and Mg is 0.008&#x2266;x&#x2266;0.54. A molar proportion y of Ni, a molar proportion &#x3b1; of Al, and a molar proportion &#x3b2; of the element M, per the foregoing total is 1.6&#x2266;y&#x2266;4, 0.008&#x2266;&#x3b1;&#x2266;0.32, and 0.01&#x2266;&#x3b2;&#x2266;0.12, respectively.

Alloy powder for electrode, negative electrode for alkaline storage battery using the same, and alkaline storage battery

There is provided a nickel-metal hydride storage battery with suppression of rise in internal pressure, allowing suppression of alkaline electrolyte leakage even when two or more of the batteries are used. The battery includes: positive and negative electrodes; a separator interposed therebetween; and an alkaline electrolyte. The negative electrode includes: a material mixture layer including hydrogen storage alloy powder capable of electrochemically absorbing and releasing hydrogen; and a water-repellent layer including a first polymer including tetrafluoroethylene as monomer units, formed on the material mixture layer. The separator includes: a primary layer having a non-woven fabric structure of fibers; and a composite layer formed on the primary layer and being in contact with the water-repellent layer. The composite layer includes: fibers in continuity with the non-woven fabric structure; and a second polymer including tetrafluoroethylene as monomer units. The composite layer has a water contact angle of 10 to 80&#xb0;.

Nickel-hydrogen storage battery and battery pack

An alkaline storage battery includes: a cylindrical case having a side wall including an opening end portion and a bottom; a sealing plate; a gasket interposed between the sealing plate and the opening end portion; and a sealant between the gasket and the opening end portion. The side wall has an annular groove opened at an outer surface thereof, and an inwardly curl portion at the opening end portion. In at least part of the groove, the minimum width L1 is within 0.2 mm. The sealant includes a polyamide resin formed such that when two test-plate materials are bonded together at bonding faces facing each other via a bonding portion of the sealant, and moved in parallel with the bonding faces and in opposite directions to have a relative displacement within 0.5 to 5 mm, a stress at least 0.02 N/mmis applied to the bonding portion.

Cylindrical alkaline storage battery

Disclosed is an optical device which includes: optical components configured to be electrically actuated such that light transmission states are variable; a driver circuit for the optical components; a power source unit for driving the optical components; rims for supporting the optical components; temples having front and rear ends and connected at the front ends to the rims; and earpieces formed at the rear ends of the temples. The power source unit includes a secondary battery, and a charge/discharge circuit for controlling charge and discharge of the secondary battery. The secondary battery is provided near the rear end of the temple or in the earpiece.

Optical device

In an alkaline battery in which a positive electrodecontaining manganese dioxide, a negative electrode, and a separatorinterposed therebetween are housed in a closed-end cylindrical battery casewhose opening is sealed with a gasket, a half-width of a 110 plane peak of the manganese dioxide measured by a powder X-ray diffraction analysis is in the range of 1.80-2.40 degrees, and anatase titanium dioxide is contained in the positive electrode such that a ratio of anatase titanium dioxide to the positive electrode is in the range of 0.10-1.50 mass %.

Alkaline battery

A lithium primary battery includes a positive electrodeusing iron sulfide as a positive electrode active material, a negative electrodeusing a lithium alloy as a negative electrode active material, an electrode groupformed by winding the positive and negative electrodeswith a separatorbeing interposed therebetween, and a non-aqueous electrolytic solution. The lithium alloy contains at least one of magnesium or tin in a range of 0.02-0.2 mol %.

Lithium primary battery

In an alkaline battery, a positive electrodecontaining manganese dioxide, a negative electrode, and a separatorinterposed therebetween are housed in a closed-end cylindrical battery casewhose openingis sealed with a gasket. The positive electrode contains graphite in such a manner that a ratio of graphite to the positive electrode is in the range of 2.5-4.3 mass %. A half-width of a 110 plane of the manganese dioxide measured by a powder X-ray diffraction analysis is in the range of 2.00-2.40 degrees.

Disclosed is an optical device which includes: an optical component configured to be electrically actuated such that a light transmission state is variable; a driver circuit for the optical component; a power source unit for driving the optical component; a rim for supporting the optical component; a temple having front and rear ends and connected at the front end to the rim; and an earpiece formed at the rear end of the temple. The power source unit includes a secondary battery, a power switch, a power switch control portion, and a use-status sensing portion for sensing the status of use by a user of the optical device. The power switch control portion performs control to turn off the power switch when the use-status sensing portion does not sense any use by the user of the optical device.

A stereoscopic image viewing device to be attached for stereoscopic image viewing to eyeglasses; which includes: a pair of light shutters for right and left eyes; a driver circuit for the light shutters; a power source unit for driving the light shutters; a bridge for supporting the light shutters at their inside edges; a binding portion for removably binding the stereoscopic image viewing device to the eyeglasses; and a support for supporting the driver circuit and the power source unit. The power source unit includes a secondary battery. The binding portion and the support are integrally formed with the bridge. The stereoscopic image viewing device has a center of gravity positioned in the bridge.

Stereoscopic image viewing device

A stereoscopic image viewing device to be attached for stereoscopic image viewing to eyeglasses, which includes: a pair of light shutters for right and left eyes; a driver circuit for the light shutters; a power source unit for driving the light shutters; a support for supporting the light shutters; and a first binding portion for removably binding the stereoscopic image viewing device to the eyeglasses, the first binding portion being integrally formed with the support. The power source unit and the driver circuit are connected to the support by a flexible connecting member without being fixed to the light shutters.

Growing community of inventors

Osaka, Japan

Fumio Kato