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AssigneeKabushiki Kaisha Toyota Jidoshokki
InventorsAtsushi Minagata, Motoaki Okuda, Hiroyasu Nishihara
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An electric storage device comprises the current interruption device which includes a deformable plate electrically connected to a first conductive member and a second conductive member to constitute part of a conductive path. The deformable plate deforms to interrupt the conductive path, when a pressure inside the casing rises. The first conductive member, the second conductive member, and the current interruption device are disposed between the terminal attachment wall and the electrode assembly. The first conductive member extends along the terminal attachment wall to connect the tab and the current interruption device. The second conductive member is connected to the current interruption device at a location that is farther from the terminal attachment wall than a connection between the first conductive member and the current interruption device, and extends along the terminal attachment wall to connect the current interruption device and the electrode terminal.
An electric storage device comprising:
Dependencies are inferred from the claim text.
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Devices or arrangements for the interruption of current: in response to pressure
Current conducting connections for cells or batteries: fixed electrical connections, i.e. not intended for disconnection
Safety devices for primary or secondary batteries: pressure-sensitive devices
Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation: energy storage using batteries
About 7 years of term left · ends 6 Nov 2033 (estimated)
This application is a National Stage of International Application No. PCT/JP2013/069406 filed Jul. 17, 2013, claiming priority based on Japanese Patent Application No. 2012-160276, filed Jul. 19, 2012, the contents of all of which are incorporated herein by reference in their entirety.
The present application claims priority under Japanese Unexamined Patent Application No. 2012-160276 filed on Jul. 19, 2012, the entire contents of which are incorporated herein by reference. The present invention relates to an electric storage device including a current interruption device.
Japanese Unexamined Patent Application Publication No. 2000-77058 discloses a battery including a pressure-sensitive current interruption device. In this battery, a tab protruding upward from an electrode assembly, a lead extending substantially linearly in a lateral direction from the tab, and the current interruption device are arranged in series to connect a conductive path between an electrode terminal and the electrode assembly. The current interruption device has a diaphragm portion joined to an upper surface of the lead. In a case where the pressure inside a battery casing rises, the diaphragm portion is inverted upward to be disjoined from the lead, thereby interrupting the conductive path. In an upper part of the battery casing, a space for the diaphragm portion to be inverted is secured.
FIG. 1 is a longitudinal sectional view of an electric storage device according to a first Embodiment.
FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1.
FIG. 3 is a plan view of the electric storage device as seen from the line III-III of FIG. 1.
A current interruption device disclosed herein is used in a conventionally publicly-known electric storage device such as a sealed secondary battery or a sealed capacitor. Furthermore, specific examples of secondary batteries include lithium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead storage batteries, and the like. In these secondary batteries, comparatively high-capacity and large-current charge and discharge are carried out. Further, this electric storage device may be mounted in a vehicle, an electric device, or the like.
An electric storage device disclosed herein includes: a casing; an electrode assembly accommodated within the casing; a first conductive member accommodated within the casing; a second conductive member accommodated within the casing; a current interruption device accommodated within the casing; and an electrode terminal provided on a terminal attachment wall of the casing. The electrode assembly includes a positive electrode and a negative electrode, and has a tab protruding from at least either the positive electrode or the negative electrode toward the terminal attachment wall. The first conductive member is electrically connected to the electrode assembly, and the second conductive member is electrically connected to the electrode terminal. The current interruption device is connected in series between the first conductive member and the second conductive member.
An example of the electrode assembly is an electrode assembly including an electrode pair in which a sheet-like positive electrode and a sheet-like negative electrode are layered with a sheet-like separator sandwiched therebetween. More specific examples of the electrode assembly are a stacked type electrode assembly having a large number of these electrode pairs stacked on top of each other and a wound type electrode assembly in which this electrode pair is wound around a predetermined axis. The electrode assembly may be impregnated with an electrolyte.