Toyota Jidosha Kabushiki Kaisha

Hiroaki Imanishi

Hiroya Umeyama

Yukinobu Miyamura

Kiyomi Kozuki

Hiroshi Takamatsu

Ichiro Murata

Tatsuya Hashimoto

Tomohiro Matsuura

Koichi Toriyama

Koji Torita

Mizuho Matsumoto

Satomi Yamamoto

Yukio Harima

A secondary battery includes: an electrode body including an electrode main body, a collector foil protrusion section, and a collector foil connection portion; a first collector terminal including a first extension part that is welded to the collector foil connection portion; and a second collector terminal that is a member separate from the first collector terminal and includes a second extension part welded to the collector foil connection portion. The first extension part and the second extension part are located on the opposite sides of the collector foil connection portion. The secondary battery includes a welded joint at which both the first extension part and the second extension part are welded to the collector foil connection portion such that the first extension part, the second extension part, and the collector foil connection portion are united. The first collector terminal and the second collector terminal are united through the welded joint.

Secondary battery and secondary battery manufacturing method

Provided is a nonaqueous electrolyte secondary battery that can be produced with high yield, through suppression of breakage of electrode collector portions during production and through suppression of damage to an electrode body during welding. The nonaqueous electrolyte secondary battery disclosed herein is provided with: an electrode body in which a plurality of electrodes are stacked; and a nonaqueous electrolyte. Each electrode has a collector and an active material layer formed on the collector. Each electrode has a collector portion being an active material layer non-forming portion. The collector portions of the electrodes are grouped and are clamped, in the stacking direction of the electrode body, by two or more members of an electrode collector terminal that is made up of the members. The collector portions of the electrodes and the members that clamp the collector portions are welded.

Nonaqueous electrolyte secondary battery and production method thereof

A secondary battery includes a reverse plate formed using a conductive material and provided in a case, and a fixing member formed using an elastically deformable material and joined to the reverse plate. When an internal pressure in the case is increased, the reverse plate deforms in response to the internal pressure, to thereby electrically connect a positive electrode terminal and a negative electrode terminal. With the increase in the internal pressure, the fixing member elastically deforms from a state where it is inserted into the through hole, exits the through hole and is fixed between the reverse plate and the case. The reverse plate in the deformed state is supported by the fixed fixing member.

Secondary battery

A method of manufacturing a sealed battery includes a welding step of forming a welded portion, and the welding step includes a first step of sequentially forming a plurality of weld beads in an opening edge portion and an outer peripheral edge portion such that the plurality of weld beads are spaced apart from one another, and a second step of forming a weld bead in each gap portion located between the weld beads, with a plurality of gap portions being formed in the opening edge portion and the outer peripheral edge portion.

Method of manufacturing sealed battery

This invention provides a sealed secondary battery comprising a current cutoff mechanism. The current cutoff mechanism has a current breaking valvecomprising a sloped side wallA which tapers with decreasing diameter from the inner circumference of a flangeand a domeB descending in a spherical cap shape from the rim of sloped side wallA. The rotation axis L of sloped side wallA and the sloped side wallA form an angle &#x3b8; to satisfy 60&#xb0;&#x2264;&#x3b8;&#x2264;75&#xb0; while domeB has a sphere radius R of 30 mm or larger, but smaller than 100 mm. In a planer view along the rotation axis L, the outer circumference of domeB is located outside the outer circumference of a thin portion

Sealed secondary battery

A secondary battery includes: a battery element; a case housing the battery element; a positive-electrode external terminal and a negative-electrode external terminal provided outside the case and electrically connected to the battery element; and a short-circuiting mechanism configured to establish a short-circuit between the positive and negative external terminals through the case. The short-circuiting mechanism includes a conducting portion conductively connected to one of the positive and negative external terminals so as to face the case, an inversion plate provided at a portion of the case facing the conducting portion and configured to deform to approach the conducting portion when an internal pressure of the case rises, and a brazing material provided on one of the conducting portion and the inversion plate at a position between the conducting portion and the inversion plate.

In a secondary battery () suggested herein, when a gas pressure in a battery case () is increased to or above a specified level and a current interrupt valve () is consequently raised to a connecting terminal () side, a thinned section () is broken around a portion that is joined to the current interrupt valvethe connecting terminal () and an electrode body are electrically interrupted from each other. An insulant () is disposed in a portion where the thinned section () is broken, and is interposed between both edges of the broken thinned section () after the thinned section () is broken.

Secondary battery comprising current interrupt device

A secondary battery includes a current cut-off device that cuts off a current flow between a battery element and an external terminal of a positive electrode, and a bypass member electrically connected to an external terminal of a negative electrode. The current cut-off device includes a current collecting member electrically connected to the battery element inside an outer casing, and an inversion plate electrically connected to the current collecting member. The inversion plate comes apart from the current collecting member when the inner pressure of the outer casing becomes increased so as to cut off conduction between the battery element and the external terminal of the positive electrode, and becomes further deformed to electrically connect the bypass member and the external terminal of the positive electrode.

Secondary battery and battery pack

A sealed battery with a battery element housed in a sealed casing. The sealed battery includes a valve brought into a closed state when a pressure of a gas in the casing is less than a first pressure P1, into an open state when the pressure is more than or equal to the first pressure P1 and less than a second pressure P2, and into the closed state when the pressure is more than or equal to the second pressure P2, and a safety mechanism configured to, when the internal pressure reaches a third pressure P3 exceeding the second pressure P2, operate in accordance with the third pressure P3.

Sealed battery

An inversion plate short-circuits the positive electrode external terminal and the negative electrode external terminal to each other by changing its position. A temperature sensitive member is disposed adjacent to the inversion plate on the side opposite to a direction in which the inversion plate changes its position. The volume of temperature sensitive member increases due to a rise in temperature. The temperature sensitive member contains aluminum phosphite and calcium carbonate.

Growing community of inventors

Moriguchi, Japan

Hiroaki Imanishi