Panasonic Corporation

Matsushita Electric Industrial Co., Ltd.

Panasonic Intellectual Property Management Co., Ltd.

Imec Vzw

Sony Corporation

Sanyo Electric Co., Ltd.

Mikinari Shimada

Masato Fujikawa

Hajime Nishino

Shinji Kasamatsu

Masakazu Tanahashi

Seiichi Nakatani

Norihisa Mino

Emiko Igaki

Kaoru Inoue

Hideharu Takezawa

Yasuhiko Nakada

Seigo Shiraishi

Shuji Tsutsumi

Tsunenori Yoshida

Hiroyuki Handa

Kohei Suzuki

Kazuhiro Okamura

Masashi Shoji

Mitsuhiro Murata

Koichi Hirano

Yasuhiro Sugaya

Masahide Tsukamoto

Morio Tomiyama

Yukihiro Kaneko

Philippe Vereecken

Tamao Kojima

Miyuki Nakai

Munehiro Tabata

Akihiro Ishikawa

Mitsuhiro Takeno

Maarten Mees

Akihiko Sagara

Yuu Inatomi

Seiji Nonaka

Knut Bjarne Gandrud

Masatoshi Takahashi

Akira Takahashi

Kensuke Nakura

Satoru Fujii

Yukihiro Okada

Nobuhiko Hojo

Kazuya Iwamoto

Masayuki Nagamine

Tomohiko Yokoyama

Yoshiyuki Muraoka

Kenichi Suzuki

Masaaki Kuranuki

Shoichiro Watanabe

Hirotoshi Watanabe

Shunsuke Yasui

Masato Iwanaga

Yasunori Nishida

Norihisa Takahara

Tomomichi Ueda

Kozo Watanabe

Toshiro Kume

Akira Nagasaki

Hideki Masumi

Eiji Yamashita

Masaru Kawabe

Xubin Chen

Masato Hagino

Yasuo Fukase

Susumu Nomoto

Kanji Katou

Keizou Nakagawa

Kyousuke Miyata

Tetsu Hashimoto

Shouichi Imashuku

A solid electrolyte () of the present disclosure includes porous silica () having a plurality of pores () interconnected mutually and an electrolyte () coating inner surfaces of the plurality of pores (). The electrolyte () includes 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide represented by EMI-TFSI and a lithium salt dissolved in the EMI-TFSI. A molar ratio of the EMI-TFSI to the porous silica () is larger than 1.5 and less than 2.0.

Solid electrolyte, electrode, power storage device, and method for producing solid electrolytes

A solid electrolyte () of the present disclosure includes porous silica () having a plurality of pores () interconnected mutually and an electrolyte () coating inner surfaces of the plurality of pores (). The electrolyte () includes 1-ethyl-3-methylimidazolium bis(fluorosulfonyl)imide represented by EMI-FSI and a lithium salt dissolved in the EMI-FSI. A molar ratio of the EMI-FSI to the porous silica () is larger than 1.0 and less than 3.5.

A battery housing includes: an exterior member; and a first terminal of a non-metallic material, wherein the first terminal has a first end extending to outside of the exterior member, the first terminal has a second end extending to inside of the exterior member, the first terminal includes a first long-diameter part having a first long diameter and a second long-diameter part having a second long diameter larger than the first long diameter, the first long-diameter part and the second long-diameter part being disposed between the first end of the first terminal and the second end of the first terminal, and the first long-diameter part and the second long-diameter part are embedded in the exterior member.

Battery housing and power storage device having a non-metallic terminal

In a battery pack, a plurality of cells are arranged, the cells each have an outlet through which gas generated in the cell is released in one direction, each two of the cells are arranged as one unit, and the each two of the cells are arranged such that directions of gas released through the outlets of the two cells are opposite to each other.

Battery pack

In a charging method for a lithium ion battery, constant current charging of the lithium ion battery is performed. The constant current charging includes at least three consecutive charging stages. The at least three consecutive charging stages include consecutive first, second, and third charging stages. The second charging stage has a set current value which is set lower than set current values of the first and third charging stages.

Lithium ion battery charging method and battery-equipped device

A non-aqueous electrolyte secondary battery including: a positive electrode having a positive electrode material mixture containing a composite lithium oxide; a negative electrode; a polyolefin separator; a non-aqueous electrolyte; and a heat-resistant insulating layer interposed between the positive and negative electrodes. The positive electrode material mixture has an estimated heat generation rate at 200&#xb0; C. of not greater than 50 W/kg. The positive electrode and the negative electrode are wound together with the separator and the heat-resistant insulating layer interposed therebetween.

Non-aqueous electrolyte secondary battery

An object of the present invention is to provide an electrode for a lithium ion secondary battery that can ensure a high level of safety even when exposed to severe conditions such as a nail penetration test or crush test, and exhibit excellent output characteristics. The present invention relates to an electrode for a lithium ion secondary battery having a material mixture containing active material particles capable of reversibly absorbing and desorbing lithium, and a current collector that carries the material mixture, wherein a surface of the current collector has recessed portions, and an area occupied by the recessed portions accounts for not less than 30% of an a material mixture carrying area of the current collector. The present invention further relates to an electrode for a lithium ion secondary battery wherein, in a cut surface obtained by simultaneously cutting a material mixture and a current collector vertically to an electrode plane, the maximum depth of recessed portions is not less than 1 &#x3bc;m, or a difference between an average thickness of a current collector and a maximum thickness of the current collector is not less than 0.35 &#x3bc;m.

Electrode for lithium ion secondary battery

A nonaqueous electrolyte secondary battery includes a positive electrode (), a negative electrode () and a porous insulation layer (). The positive electrode () includes a positive electrode current collector () and a positive electrode mixture layer (), and the negative electrode () includes a negative electrode current collector () and a negative electrode active material layer (). After charging the nonaqueous electrolyte secondary battery, when a surface of the positive electrode mixture layer () and a surface of the negative electrode active material layer () are brought in contact with each other, terminals are provided, respectively, on the positive electrode current collector () and the negative electrode current collector () and a resistance value between the terminals is measured, the resistance value is 1.6 &#x3a9;&#xb7;cmor more.

Nonaqueous electrolyte secondary battery

A lithium secondary battery having enhanced safety, which includes an electrode group, a non-aqueous electrolyte and a battery can for housing them. The electrode group includes: a positive electrode having a strip-shaped positive electrode current collector and a material mixture layer carried thereon; a negative electrode having a strip-shaped negative electrode current collector and a material mixture layer carried thereon; a separator; and a porous heat resistant layer. The positive and negative electrodes are spirally wound with the separator and the porous heat resistant layer interposed therebetween. An outermost surface of the electrode group includes an exposed portion of either of the positive and negative electrode current collectors. The exposed portion faces an inner surface of the battery can with the separator interposed therebetween, and has opposite polarity to that of the battery can.

Lithium secondary battery having porous heat resistant layer between electrodes

The present invention relates to an apparatus for evaluating an internal short circuit of a battery. An object of the invention is to provide an apparatus capable of evaluating whether or not an internal short circuit has occurred in an electrode group in consideration of pressure applied to the electrode group. An internal short circuit evaluation apparatus according to one embodiment of the invention includes at least a pressure member capable of operating independently and applying pressure to at least a predetermined position of the surface of the electrode group, and a short-circuiting member that is pressed into the predetermined position. An internal short circuit evaluation apparatus according to another embodiment of the invention includes a pressure member having an integrated short-circuiting member.

Internal short circuit evaluation apparatus for battery

A lithium ion secondary battery includes a positive electrode, a negative electrode, a non-aqueous electrolyte, and a separator interposed between the positive electrode and the negative electrode. The separator includes a polyolefin layer and an oxidation-resistant layer. The oxidation-resistant layer includes an oxidation-resistant polymer. A main chain of the oxidation-resistant polymer does not include a &#x2014;CH&#x2014; group and a &#x2014;CH(CH)&#x2014; group. The oxidation-resistant layer faces the positive electrode.

Lithium ion secondary battery and charge system therefor

The invention provides a method for evaluating the safety of a battery under an internal short-circuit condition. The battery includes: an electrode group including a positive electrode, a negative electrode, and an insulating layer for electrically insulating the electrodes, which are wound or laminated; an electrolyte; a housing for housing the electrode group and the electrolyte; and a current-collecting terminal for electrically connecting the electrode group and the housing. The method of the invention includes: placing a foreign object at a location inside the electrode group of the battery where the positive electrode and the negative electrode face each other; and pressing the location by the pressure applied by a pressing tool to locally crush the insulating layer between the positive and negative electrodes, thereby causing an internal short-circuit. The contact area of the electrode group and the pressing tool during the pressing is larger than the area of a rectangle circumscribed about the foreign object. A short-circuit test is conducted at a given location inside the battery to comprehensively evaluate the safety of the battery under an internal short-circuit condition.

Method for evaluating battery safety under internal short-circuit condition, battery and battery pack whose safety is identified by internal short-circuit safety evaluation method, and method for producing the same

A battery pack including at least a battery and a casing for accommodating the battery, in which the casing has a ventilation hole communicating with the outside of the casing, and a mesh member made of metal for covering at least the ventilation hole is provided at the side surface of the casing. Preferably, the mesh member is coated with an insulating resin.

Battery pack, electronic apparatus equipped with the same and electronic apparatus equipped with battery housing part

A separator for use in a non-aqueous electrolyte secondary battery including a first porous layer (layer A) having a shutdown function which becomes substantially a non-porous layer at a high temperature, and a second porous layer (layer B) including an aramid resin and an inorganic material, wherein a ratio (T/T) of a thickness (T) of the layer A relative to a thickness (T) of the layer B is 2.5 or more and 13 or less.

Separator for use in non-aqueous electrolyte secondary battery and non-aqueous electrolyte secondary battery

An object of the present invention is to provide a high-energy density nonaqueous electrolyte secondary battery that controls the rise in temperature during short circuiting. Used is a nonaqueous electrolyte secondary battery, including a battery case, and a positive electrode platehaving a positive electrode current collector and a positive electrode mixture layer containing a cathode material capable of absorbing and desorbing lithium, a negative electrode platehaving a negative electrode current collector and a negative electrode mixture layer containing an anode material capable of absorbing and desorbing lithium, a separatorheld between the positive and negative electrode plates, and a nonaqueous electrolyte that are enclosed in the battery case, wherein at least one of the positive electrode plateand the negative electrode platehas an electrode plate resistance, as determined in the charged state in the thickness direction when pressurized at 50 kg/cm2, of 0.4 &#x3a9;&#xb7;cmor more.

Growing community of inventors

Osaka, Japan

Mikinari Shimada