Panasonic Intellectual Property Management Co., Ltd.

Sanyo Electric Co., Ltd.

Panasonic Corporation

Panasonic Holdings Corporation

Panasonic Energy Co., Ltd.

Tomohiko Yokoyama

Masato Fujikawa

Keisuke Shimizu

Kyosuke Miyata

Kazutoshi Kohira

Hideharu Takezawa

Shunsuke Yasui

Takahiro Fukuoka

Yoshiyuki Muraoka

Oose Okutani

Shinya Geshi

Daisuke Kishii

Takeshi Enomoto

Kazuya Iwamoto

Yasunari Sugita

Shinji Kasamatsu

Taisuke Yamamoto

Keisuke Naito

Shin Haraguchi

Shuji Sugimoto

Koki Inoue

Yuji Yamagami

Mikinari Shimada

Hajime Nishino

Akiko Yuasa

Kazuki Endo

Yasunobu Kodama

Naoto Kunoike

Ryota Okimoto

Ryo Kashimura

Satoru Mihara

Shota Koyama

The secondary cell—includes an exterior can, a sealing body closing one end of the exterior can, an electrode group disposed inside the exterior can, and an insulating plate disposed between the sealing body and the electrode group. In the electrode group, a positive electrode and a negative electrode are wound in a spiral shape with a separator interposed between. The insulating plate is shaped as a disc having a lead hole penetrated by a positive electrode lead drawn out from the electrode group, and a center hole penetrating the center part of the insulating plate. The outer edge of the lead hole includes a curve part positioned along an arc that is concentric with respect to the outer circumference of the insulating plate as seen in plan view, and linear parts-positioned along a chord linking the two ends of the arc.

Cylindrical non-aqueous electrolyte secondary cell

An insulating plate for a secondary battery includes a wound electrode group, an electrolyte, a cylindrical battery case that houses the electrode group and the electrolyte, and a sealing body that seals an opening of the battery case and includes a discharge valve. The insulating plate is disposed between the electrode group and the sealing body and has a disk shape with a thickness T of 0.1 mm or more. The insulating plate has a first hole formed centrally therein and at least one second hole formed around the first hole so as to extend along the outer periphery of the disk shape. The ratio (=T/D) of the thickness T to a diameter D of the insulating plate is 0.016 or less, and the insulating plate has an opening ratio of 36% or less.

Secondary battery insulating plate and secondary battery including the same

A cylindrical battery according to an embodiment of the present invention includes an electrode body, an electrolyte solution, a tubular exterior can that accommodates the electrode body and the electrolyte solution, and a sealing body that is crimped on an opening portion of the exterior can. The sealing body includes a current interrupt mechanism in which a valve member and a metal plate are joined to each other with an insulating plate that includes a circular hollow portion interposed therebetween. The metal plate includes a thin portion that has a circular shape or a C-shape. The hollow portion and the thin portion are concentric with each other when viewed from a direction perpendicular to the metal plate. D/Dis no less than 0.56 and no more than 1 where Dis the diameter of the thin portion, and Dis the diameter of the hollow portion.

Cylindrical battery

A cylindrical battery according to an embodiment of the present invention includes an electrode body, an electrolyte solution, a tubular exterior can that has a bottom and that accommodates the electrode body and the electrolyte solution, and a sealing body that seals the exterior can. The sealing body includes a valve member, an insulating plate that includes a hollow portion, and a metal plate that has a first through-hole. The insulating plate is disposed between the valve member and the metal plate. At least one of the valve member and the metal plate includes a projection that projects toward an inside of the hollow portion. The valve member and the metal plate are joined to each other at the projection. The insulating plate has a second through-hole that is formed around the hollow portion.

A cylindrical battery according to an aspect of the present invention includes an electrode assembly including a positive electrode plate and a negative electrode plate wound together via a separator, an electrolytic solution, a bottomed cylindrical housing can, and a sealing unit fixed by crimping of an open end of the housing can via a gasket. The sealing unit includes a valve member having a circular outline, a metal plate connected to a central portion of the valve member so as to be farther inside the battery than the valve member, and an annular insulating member disposed between an outer peripheral portion of the valve member and an outer peripheral portion of the metal plate. The valve member has a sloping region in which the thickness decreases or increases continuously along the radial direction.

Cylindrical batteries

A cylindrical battery in an aspect of the present invention includes an electrode body formed by winding a positive electrode plate and a negative electrode plate with a separator interposed therebetween; an electrolyte; a bottomed cylindrical outer can; and a sealing body crimped to an opening of the outer can via a gasket. The sealing body includes a valve body having an annular protrusion part, an insulating member disposed on an inner circumference of the protrusion part of the valve body and having a skirt portion, and a metal plate disposed on an inner circumference of the skirt portion of the insulating member and connected to a center portion of the valve body. The metal plate is crimped with the protrusion part of the valve body via the insulating member.

Cylindrical battery and method for producing the same

A battery includes a bottomed cylindrical case body that accommodates an electrode body and a bottom-portion insulating plate () that is disposed between the electrode body and a bottom portion of the case body. The bottom portion of the case body has a gas discharge port that opens when an internal pressure of the battery reaches a predetermined pressure. The bottom-portion insulating plate () has a through hole. An aperture ratio, which is a ratio of an area of the through hole with respect to a total area of the insulating plate, is greater than or equal to 10% and less than or equal to 40%. A Young's modulus of the bottom-portion insulating plate at 25&#xb0; C. is 10 GPa or greater.

Battery

A cylindrical lithium ion battery in which an electrode group formed by winding a positive electrode and a negative electrode is housed in a battery case is disclosed. A sealing plate seals an opening of the battery case. An insulating plate having a plurality of openings is provided on a side of the electrode group closer to the sealing plate. The plurality of openings include a first hole with a largest opening area, and a plurality of second holes with opening areas smaller than the opening area of the first hole. An opening ratio of the first hole is 12% or more and 40% or less; a sum of opening ratios of the second holes is 0.3% or more and 10% or less; and a total opening ratio of all the openings is 20% or more and 50% or less.

Cylindrical lithium-ion cell

A cylindrical battery having a sealing unit which includes at least a valve member, a metal plate disposed farther inside the battery than the valve member and having a joint portion connected to the valve member, and an annular insulating member disposed between an outer peripheral portion of the valve member and an outer peripheral portion of the metal plate. The metal plate has a groove-shaped thin portion disposed around the joint portion, and straight portions that have different angles to the normal to the metal plate are disposed on an inner peripheral side and an outer peripheral side of a cross section of the thin portion perpendicular to the longitudinal direction.

The battery is sealed by a sealing member including a safety valve for exhausting the gas generated in the battery to the outside of the battery when the pressure in the battery is increased. A part of the sealing member is formed of a member having a melting point lower than that of high-temperature gas generated in the abnormal time and having a ratio of an area of an opening of the battery case to an area of a gas exhaust hole is 3.0&#xd7;10or more and 9.1&#xd7;10or less.

Sealed type battery

Battery pack includes battery module, metallic installation substrate, metallic attachment member disposed between battery module and installation substrate, metallic fastening part, and insulating member for electrically insulating fastening part and attachment member, and attachment member and installation substrate, from each other, respectively. Insulating member includes annular insulating part having an inner-diameter hole allowing passing through of a male screw shaft portion of fastening part, and electrically insulating between attachment member and an entire surface of an outer periphery of the male screw shaft portion of the fastening part, and between attachment member and an entire surface of an outer periphery of the larger-diameter portion of fastening part; and plate-like insulating part having a corresponding inner-diameter hole which corresponds to the inner-diameter hole of annular insulating part and allows passing through of the male screw shaft portion of fastening part, and electrically insulating between attachment member and installation substrate.

Fastening structure

The opening of a cylindrical battery casewith a bottom is sealed by a seal assembly. The seal assemblyhas an upper valve plate, a lower valve plate, and a bottom plate. The bottom platehas inner gas vent holes. When the inner gas vent holesare viewed from the axial direction of the battery case, at least a part of each inner gas vent holeoverlaps a valve-hole forming portionof the lower valve plate. With this configuration, for example, even when an electrode assemblyis pushed up by increased internal pressure of the battery to push up the bottom plate, the valve hole is not closed.

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Osaka, Japan

Tomohiko Yokoyama