Hitachi Automotive Systems, Ltd.

Hitachi Plant Technologies, Ltd.

Vehicle Energy Japan Inc.

Hitachi Vehicle Energy, Ltd.

Masaaki Iwasa

Takuro Tsunaki

Kazuaki Urano

Sho Matsumoto

Takashi Sasaki

Hiromi Kobayashi

Takeshi Tsukamoto

Tetsuya Kuwano

Sho Saimaru

Ryujiro Udo

Hideto Nogiwa

Yoshihisa Maeda

Kinya Aota

Osamu Kubota

Akihide Tanaka

Kouichi Kajiwara

Keisuke Sawada

Hitoshi Nishimori

Toshiro Fujita

Provided is a rectangular secondary battery with improved rigidity against vibrations and impacts. A rectangular secondary battery of the present invention includes: a flat-shaped electrode group; a current-collecting plate electrically connected to the electrode group; a battery case accommodating the current-collecting plate and the electrode group; a battery cover that closes an opening of the battery case; an electrode terminal penetrating through the battery cover, the electrode terminal being connected to the current-collecting plate via a connecting member; and a gasket that is inserted between the electrode terminal and the battery cover for insulating and sealing. An insulator is disposed between the current-collecting plate and the battery cover, the battery cover includes a battery cover side fixing part that fixes the insulator, and the insulator includes a current-collecting plate side fixing part that fixes the current-collecting plate.

Rectangular secondary battery

Provided is a secondary cell which is resistant to vibration and impact. The secondary cell includes a flat wound group supported, through an insulator, at a lid on which external terminals are arranged, and a cell case for housing the flat wound group. In the secondary cell, a flat portion of the flat wound group has a gap between the flat portion and a wide surface of the cell case, and is held on the wide surface near a cell case bottom through a holding portion.

Secondary cell

Provided is a secondary battery which can more securely suppress vibrations applied to a current interrupting mechanism. A secondary battery including: a current interrupting mechanism that interrupts a current path between an external terminal and an electrode in a battery container. The current interrupting mechanism includes a collector plate that is connected to the electrode, a diaphragm that is connected to a base portion of the collector plate and disconnected from the base portion by being deformed when a pressure in the battery container is increased, and an insulating member that fixes the diaphragm and the base portion of the collector plate on the inside of the battery container. The insulating member includes a plurality of projections that protrude in a thickness direction of the base portion, and the base portion includes a plurality of notches through which the projection passes in the thickness direction. The projection includes an engaging member that is engaged with an end surface of the base portion on a side opposite to the insulating member and a side surface of the base portion along the thickness direction.

Secondary battery

A square secondary battery includes a generating element having an electrode; a battery can holding the generating element; a battery lid that seals an opening of the battery can; an external terminal arranged on the battery lid; and a current collector connecting the electrode of the generating element to the external terminal. The external terminal has a bus bar joint to which a bus bar is connected and a current collector joint to which the current collector is connected, the bus bar joint and the current collector joint being integrally juxtaposed on the battery lid. The current collector joint has a cylindrical insertion part to be inserted into a through hole in the battery lid and also has a sealing part arranged at an outer periphery of the insertion part, the sealing part pressing down a sealing member.

Square secondary battery

A secondary battery typified by a lithium-ion secondary battery includes a battery outer container in which a gas release valve and positive and negative electrode external terminals are provided, an electrode group in which positive and negative plates are stacked with a separator interposed therebetween and current collection portions are provided at both ends, and positive and negative electrode current collectors forming a current path from the current collection portions of the electrode group to the positive and negative electrode external terminals, and the cross-sectional area of a gas exhaust flow channel through which gas generated inside the electrode group is discharged from the gas release valve is set so as to increase in a downstream direction.

A rectangular secondary battery includes a current breaking mechanism with improved rigidity against vibration and impact. The current breaking mechanism is interposed in the middle of a current path electrically connected between an external terminal and a wound electrode group to break the current path by the rise of battery internal pressure. The current breaking mechanism includes a connection electrode arranged inside a battery lid and electrically connected to the external terminal, and a conductive plate bonded to the connection electrode and deformed by the rise of the battery internal pressure. The connection electrode includes a tabular member having a through hole in communication with the outside of the battery opening on a planar portion. The conductive plate includes a dome-shaped diaphragm portion gradually reducing its diameter as shifting in an axial direction and a flange portion extending radially outward from an outer peripheral portion of the diaphragm portion.

Secondary battery with current breaking mechanism

An electrical storage element includes a power generation element that includes an electrode, a can in which the power generation element is stored, a lid that seals an opening of the can, an external terminal that is disposed on the lid, and a current collector that connects the electrode of the power generation element, and the external terminal. The external terminal includes a bus bar welding portion having a bus bar welding surface to which a bus bar is welded, and a current collector connection portion having a caulking-jig abutting surface, the current collector connection portion includes an insertion portion which is inserted into a through-hole of the lid and has a tip end which is fixed to the current collector by caulking, the bus bar welding portion and the current collector connection portion are integrally provided in parallel on the lid, and the jig abutting surface is extended from the bus bar welding surface in the same plane as the bus bar welding surface.

Electrical storage element

A secondary cell includes: an electrode roll in which a positive foil on which a positive-electrode material is coated and a negative foil on which a negative-electrode material is coated are winded through a separator into a flat shape around a winding core; a case in which the electrode roll is housed; a cover which seals the case; a positive terminal and a negative terminal provided on the cover; a positive electrode current collector plate that is electrically connected to the positive foil of the electrode roll and the positive terminal and held by the cover; and a negative electrode current collector plate that is electrically connected to the negative foil of the electrode roll and the negative terminal and held by the cover. The positive electrode current collector plate and the negative electrode current collector plate are each connected to the winding core.

A welding method for an impeller having a plurality of blades, a disc and an exterior body including a shroud welded to the plurality of blades, comprising the steps of:

Welding method and welding apparatus for an impeller

Blades are connected to the surface of a disk and slots are formed in the surface of a shroud, which is opposite from the other surface of the shroud where the blades are to be welded. The blades are arranged on the opposite surface from the slots and a laser beam is applied from the surface in which the slots are formed, to weld the shroud and the blades. Components are installed on the surfaces of the slots on the opposite side from the blades after the blades and the shroud in which the slots are formed are welded. Alternatively, the slots are filled with a material different from that of the shroud, such as a resin. With this configuration, distortion caused by welding heat can be reduced without degrading the fluid performance.

Growing community of inventors

Hitachinaka, Japan

Masaaki Iwasa