Panasonic Corporation

Panasonic Intellectual Property Management Co., Ltd.

Matsushita Electric Industrial Co., Ltd.

Sanyo Electric Co., Ltd.

Lintec Corporation

Panasonic Holdings Corporation

Hajime Nishino

Mikinari Shimada

Shinji Kasamatsu

Masato Fujikawa

Hideharu Takezawa

Tomoki Shiozaki

Hizuru Koshina

Kazuhiro Okamura

Miyuki Nakai

Masaki Kitagawa

Kazuhiro Yoshii

Yukihiro Okada

Yoshiyuki Muraoka

Yuji Oura

Kensuke Nakura

Shuji Ito

Yasuhiro Sugaya

Tomohiko Yokoyama

Takashi Takeuchi

Kenichi Suzuki

Shoichiro Watanabe

Tomokazu Sada

Shunsuke Yasui

Shuji Tsutsumi

Yasushi Hirakawa

Takafumi Oura

Kunio Tsuruta

Yuichi Kurata

Tomomichi Ueda

Kozo Watanabe

Takeshi Ansai

Shin Haraguchi

Koshi Takamura

Masaya Okochi

Mitsuhiro Takeno

Jun Asakura

Toyoji Sugimoto

Takanori Maruo

Takao Sato

Yoshihiro Kashihara

Kazuya Maegawa

Tetsuyuki Okano

Kyousuke Miyata

Yoshio Nakatani

Kaoru Tsukamoto

Hisanori Sugimoto

Kojiro Ishikawa

Satoko Motomatsu

A battery includes a positive electrode, a negative electrode, a positive electrode lead which is connected to the positive electrode, and a protective tape which covers the positive electrode lead. The protective tape includes a base material layer and an adhesive layer that is arranged on the base material layer; and the adhesive layer contains an adhesive material and a filler which contains at least one compound that is selected from among phosphoric acid group-containing compounds, boric acid group-containing compounds and silicic acid group-containing compounds.

Protective tape for positive electrode lead including adhesive layer having heat resistant filler, and battery including the same

A pressure sensitive adhesive sheet for batteries, which includes a base material and a pressure sensitive adhesive layer provided on one surface side of the base material. The pressure sensitive adhesive layer contains inorganic fine particles having a water content of 0.4% or less in a single body.

Pressure sensitive adhesive sheet for batteries and lithium-ion battery

A winding-start region that is closer to a winding-start side than a positive electrode core exposed part has positive electrode mixture unit amounts of a positive electrode inner mixture layer and a positive electrode outer mixture layer that are approximately uniform or increasing toward a winding-end side in the winding direction. A winding-start facing region has negative electrode mixture unit amounts of a negative electrode inner mixture layer and a negative electrode outer mixture layer that are approximately uniform or increasing toward the winding-end side. The positive electrode inner mixture layer and the positive electrode outer mixture layer each have a positive electrode mixture unit amount that differs at two or more locations, excluding the positive electrode core exposed part. The negative electrode inner mixture layer and the negative electrode outer mixture each have a fluctuating part where the negative electrode mixture unit amount fluctuates toward the winding-end side.

Winding-type electrode body of non-aqueous electrolyte secondary battery, and non-aqueous electrolyte secondary battery

A secondary battery includes: a positive electrode having a positive-electrode current collector and a positive-electrode active-material layer; a negative electrode having a negative-electrode current collector and a negative-electrode active-material layer; a electrolyte; and an insulating tape covering a portion of the positive electrode. Furthermore, the positive-electrode current collector has an exposed section that the positive-electrode active-material layer is not disposed. In addition, at least a portion of the exposed section is covered with the insulating tape; the insulating tape has a substrate material layer and an adhesive layer; and the adhesive layer includes an adhesive agent and an insulating inorganic material.

Secondary battery including insulating tape covering positive electrode

A nonaqueous electrolyte secondary battery with a positive electrode having a positive electrode current collector and a positive electrode active material layer that is supported by a first main surface and a second main surface. The first main surface includes a first exposed section on which the positive electrode active material layer is not arranged. A positive electrode lead is connected to the first exposed section and includes an extension section and an overlapping section. At least a portion of the first exposed section, along with at least a portion of the overlapping section, is covered with a positive electrode insulating tape which has a base, a first layer that adheres to the first exposed section and to the overlapping section, and a second layer interposed between the base and the first layer; and the second layer expands when heated above a threshold.

Nonaqueous electrolyte secondary battery

Secondary battery

A battery case includes a case main body (), a sealing body that seals an opening of the main body, and an insulating body () that is disposed at a part where the case body () and the sealing body are in contact with each other. In the battery case, an open end () of the case body () is crimped to the sealing body, and a dent () is formed in the sealing body by pressing the open end () against the sealing body.

Battery case and battery

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

In the non-aqueous electrolyte secondary battery of the present invention, the separator includes a heat-resistant resin having chlorine atoms as an end group and the positive electrode active material includes a lithium-containing complex oxide containing aluminum atoms in its composition. Even if the chlorine atoms are liberated into the non-aqueous electrolyte, aluminum contained in the positive electrode active material is selectively leached into the non-aqueous electrolyte, thereby suppressing the leaching of other component elements. Consequently, there can be obtained a non-aqueous electrolyte secondary battery excellent in safety and high temperature storage characteristics.

Nonaqueous electrolyte secondary battery with high temperature and storage characteristics

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.

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

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

Nara, Japan

Hajime Nishino