Sanyo Electric Co., Ltd.

Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Panasonic Energy Co., Ltd.

Tomomichi Ueda

Masahiro Nakamura

Kazumichi Shimizu

Shinya Mori

Atsushi Mizawa

Katsuhiko Mori

Junichi Sugaya

Tadahiro Tokumoto

Shoji Yamashita

Mikinari Shimada

Hajime Nishino

Ryuichiro Ebi

Akihiro Horikawa

Kei Kobayashi

Yoshio Goda

Masatoshi Hano

Susumu Kitaoka

Yuji Yamagami

Koichi Kusagawa

Takanori Kitagawa

Kyousuke Miyata

Masanori Makino

Kazuyuki Higashi

The present disclosure aims to suppress, in a winding type electrode body in which a negative electrode lead is bonded to a winding start side end of a negative electrode collector, electrode plate deformation in association with charge/discharge cycles. A nonaqueous electrolyte secondary battery according to one aspect of the present disclosure includes a winding type electrode body (). A negative electrode () includes a negative electrode lead () bonded to a winding start side end of a negative electrode collector and is wound at least one turn from a winding-direction inner end so as not to face a positive electrode () with a separator () interposed therebetween. The negative electrode () includes an insulating tape () adhered to the negative electrode collector so as to straddle a surface of the negative electrode lead () in a winding direction.

Nonaqueous electrolyte secondary battery

A method for manufacturing a nonaqueous electrolyte secondary battery, when an electrode tab is provided at a longitudinal-direction end portion of an electrode located at a winding-start side of an electrode body, the method being capable of sufficiently reducing damage on a separator and the electrode in a process for manufacturing the electrode body. In a manufacturing step of one example of an embodiment, a negative electrode tab is bonded to a longitudinal-direction end portion of a negative electrode to be located at a winding-start side of an electrode body, the negative electrode tab is processed so that a width-direction central portion of the negative electrode tab at least bulges toward a winding-outer side of the electrode body, and while a gap is formed between the negative electrode tab and a winding core, a positive electrode, the negative electrode, and a separator are wound around the winding core.

Method for manufacturing nonaqueous electrolyte secondary battery

A nonaqueous electrolyte secondary battery according to an embodiment of the present disclosure includes: a wound electrode assembly () formed by spirally winding, via a separator (), a positive electrode () and a negative electrode () in which a negative electrode mixture layer is formed on a negative electrode core, where: the negative electrode () includes a non-opposing portion () that is wound 1.25 turns or more from an inner edge in a winding direction of the wound electrode assembly () without facing the positive electrode via the separator (); the non-opposing portion () includes a negative electrode mixture layer-formed portion () in which the negative electrode mixture layer is formed on at least either side continuously in an inward winding direction from an outer edge in the winding direction; and the negative electrode mixture layer-formed portion () is wound 0.75 turns or more.

Cylindrical nonaqueous electrolyte secondary battery

Battery

A positive electrode active material layer is formed on at least one surface of a positive electrode current collector having a substantially rectangular planar shape. The positive electrode current collector includes an exposed portion in a partial region in a longitudinal direction and at an end portion of the partial region in a width direction, and a positive electrode lead is to be connected to the exposed portion. In a region in which the positive electrode active material layer is formed, an elastic modulus of a first region adjacent to the exposed portion in the width direction is larger than elastic moduli of second regions adjacent to the exposed portion and the first region in the longitudinal direction.

Electrode sheet for use in power storage device and power storage device including electrode sheet

To operate a safety mechanism normally even when an accident happens. For this object, an electrochemical element includes an exhaust valve that operates when an internal pressure in a casingreaches a predetermined pressure to release gas occurring in the casing to the outside, and a perforated platehaving holesand, which is provided between an electrode groupand the exhaust valve. The area of the perforated plateexcluding the holesandis 20% or more and 50% or less of the area of the opening of the casing. The perforated plateis adapted for electrically insulating the electrode groupfrom the sealing member

Electrochemical element

A battery case () has a cutting groove () formed on its elongated side surface (). Between a groove bottom surface of the cutting groove () and an inner surface of the battery case () is provided a thin-walled easily-rupturable portion () designed to rupture at an instant when an internal pressure of the battery case () reaches a predetermined value. Thereby, a safety mechanism for use with a prismatic battery is realized. The manufacture of the safety mechanism is as follows. A cutting blade () rotated at a high speed by a high-speed rotary body () is brought into cutting engagement with the elongated side surface () of the battery case () of the prismatic battery in finished form until it reaches a predetermined depth and is fixed, and subsequently the high-speed rotary body () or the prismatic battery is brought into rectilinear relative movement.

Safety mechanism for rectangular battery and method of manufacturing the same

A prismatic battery case with high dimensional precision is manufactured, while pursuing an improvement in productivity, with a manufacturing method of a prismatic battery case that includes a first step for molding an intermediate cup body () by impact molding a pellet () of prescribed shape, and a second step for molding a prismatic battery case () with a cross section of substantially rectangular shape by DI processing the intermediate cup body (). The DI processing conducts drawing and ironing continuously, in one action.

Square battery container, method of manufacturing the container, and square battery using the container

A battery case ( ) is formed such that a thickness (t ) of a side wall ( ) with respect to a thickness (t ) of a bottom wall ( ) satisfies t &equals;&agr;t (&agr;&equals;0.2 to 0.7) undergoing an ironing step using ironing dies ( , and ) aligned in multiple stages, and that an inside face of the side wall is made to have a rough surface having average surface roughness of 0.2 &mgr;m to 2.0 &mgr;m by undergoing a drawing step after the ironing step. A manufacturing method of the battery case includes a first step of manufacturing a battery case element ( ) by applying the DI processing to a cup-shaped intermediate product ( ), and a second step of manufacturing a battery case by reducing an outside diameter to a predetermined outside diameter (r) without changing a thickness of a side wall by applying drawing processing to the battery case element by drawing dies ( and ) aligned in multiple stages.

Cell tube and method of manufacturing the cell tube

Growing community of inventors

Osaka, Japan

Tomomichi Ueda