Abstract: Provided is an electricity storage device having a high volumetric energy density and high reliability. The electricity storage device includes: an electrode assembly including first and second electrode plates and a separator interposed therebetween; an exterior housing that houses the electrode assembly; a lid that covers an opening of the exterior housing; and electrode terminals that are electrically connected to the electrode assembly and partially protrude from the lid to the outside. The lid has a liquid injection hole for injecting an electrolytic solution into the exterior housing. A tubular member extending from the lid toward the electrode assembly is provided between the outer surface of the lid and the electrode assembly so as to surround an opening of the liquid injection hole. A covering member connected to the tubular member and interposed between the liquid injection hole and the electrode assembly is provided.

Abstract: Provided is a technique decreasing a risk of damaging inside of an electrode assembly by an electrolytic solution injection. The electric storage device includes an electrode assembly, an electrolytic solution, an outer case, a sealing plate, and a current collector. The electrode assembly includes an electrode tab. The outer case includes an opening. The sealing plate is provided with a liquid injection hole. The current collector is attached to the sealing plate, and is electrically connected to the electrode assembly via the electrode tab. On the sealing plate, the liquid injection hole is provided not to overlap with a portion to which the current collector is attached. Between the liquid injection hole and the electrode assembly, a shielding part is provided to inhibit the electrolytic solution injected through the liquid injection hole from directly coming into contact with the electrode assembly.

Abstract: Provided is a technique suppressing an electrode assembly inside an outer case from moving in a vertical direction with a simple configuration. An electric storage device includes the electrode assembly, the outer case, a sealing plate, a current collector, and an insulating member. The electrode assembly includes a tab. The outer case includes a bottom surface and an opening opposed to the bottom surface, and is a member accommodating the electrode assembly inside. The sealing plate covers the opening. The current collector is attached to the sealing plate, and is electrically connected to the electrode assembly via the tab. The insulating member is arranged between the sealing plate and the current collector. In addition, the insulating member includes an extension part configured to extend toward the electrode assembly so as to press the electrode assembly onto the bottom surface.

Abstract: Provided is an electricity storage device having a high volumetric energy density and high reliability. The electricity storage device includes: an electrode assembly including first and second electrode plates and a separator interposed therebetween; an exterior housing that houses the electrode assembly; a lid that covers an opening of the exterior housing; and electrode terminals that are electrically connected to the electrode assembly and partially protrude from the lid to the outside. The lid has a liquid injection hole for injecting an electrolytic solution into the exterior housing. A tubular member extending from the lid toward the electrode assembly is provided between the outer surface of the lid and the electrode assembly so as to surround an opening of the liquid injection hole. A covering member connected to the tubular member and interposed between the liquid injection hole and the electrode assembly is provided.

Abstract: A battery cell includes: a resin insulator having a first portion, a second portion, and a third portion, the first portion being a portion that insulates a terminal portion and a sealing plate from each other outside an exterior container, the second portion being a portion that insulates a current collector and the sealing plate from each other inside the exterior container, the third portion being a portion that has a tubular shape and that communicates with an electrolyte solution injection hole, wherein the third portion of the resin insulator includes a shielding portion that shields between at least a portion of the electrolyte solution injection hole and an electrode assembly, and the first portion, the second portion and the third portion of the resin insulator are molded to be integrated together.

Abstract: A positive electrode terminal is inserted into a current-collector through hole formed in a positive electrode current collector and riveted in a spot-faced hole formed in the positive electrode current collector. A protrusion is formed on a bottom surface of the spot-faced hole so as to extend around the current-collector through hole, and a riveted portion of the positive electrode terminal covers the protrusion. The riveted portion of the positive electrode terminal is weld-connected to an edge of the spot-faced hole.

Abstract: A welding structure of metal members includes a first member having a first opposing surface, a second member having a second opposing surface, and a welding portion fixing the first member and the second member to each other. A gap is formed between the first opposing surface and the second opposing surface. R1>R2 is satisfied where R1 represents a width of the welding portion in the gap and R2 represents a width of the welding portion on the first opposing surface of the first member. T2>T1 is satisfied where T2 represents a thickness of the second member in the portion where the welding portion is formed and T1 represents a thickness of the first member in the portion where the welding portion is formed. 0.8?D1/T1?1.2 is satisfied where D1 represents a depth of the welding portion in the second member from the second opposing surface.

Abstract: A method of manufacturing a secondary battery including a joining step of clamping a negative electrode core body stacked part and a negative electrode current collector by a horn and an anvil, and in a state where the anvil is in contact with the negative electrode current collector, ultrasonically joining the negative electrode core body stacked part and the negative electrode current collector to form a joint part; and an oxidation treatment step of oxidizing a portion, in contact with the anvil, of the negative electrode current collector in the joining step.

Abstract: A positive electrode terminal is inserted into a current-collector through hole formed, in a positive electrode current collector and riveted in a spot-faced hole formed in the positive electrode current collector. A protrusion is formed on a bottom surface of the spot-faced hole so as to extend around the current-collector through hole, and a riveted portion of the positive electrode terminal covers the protrusion. The riveted portion of the positive electrode terminal is weld-connected to an edge of the spot-faced hole.

Abstract: The herein-disclosed sealed battery includes a sealing plate, a sealing plug comprising a flange part opposed to an outer surface of the sealing plate, and a sealing member disposed between the sealing plate and the flange part of the sealing plug. Then, regarding the herein-disclosed sealed battery, the outer surface of the sealing plate and an opposed surface of the flange part include a rough surface area R on at least a part of a portion contacting with the sealing member and an arithmetic average roughness Sa of the rough surface area is equal to or more than 1 ?m. By doing this, it is possible to suppress a liquid leakage of an electrolyte.

Abstract: The herein-disclosed sealed battery includes a battery case, a terminal member (negative electrode external terminal) including an opposed surface opposed to the battery case, and an insulating member (negative side gasket) disposed between the sealing plate and the negative electrode external terminal. Then, the surface of the battery case and/or an opposed surface of the negative electrode external terminal includes a 1st rough surface area on at least a part of a portion contacting with the negative side gasket, and an arithmetic average roughness Sa of the 1st rough surface area is equal to or more than 1 ?m. By doing this, it is possible to suppress a liquid leakage of an electrolyte caused by degradation of the negative side gasket.

Abstract: A square type battery includes a cover that is provided with a terminal and is formed in a substantially rectangle, a case main body that is formed in a substantially rectangular parallelopiped and that includes two pairs of opposed side surfaces connected to a peripheral edge part of the cover, and an electrode body that is accommodated inside the case main body and that is connected to the terminal. At least a first side surface among the two pairs of opposed side surfaces is pinched toward an inward of the case main body. The first side surface and a second side surface opposed to the first side surface abut the electrode body.

Abstract: Provided is a technology to suppress a decrease in airtightness around a liquid injection port of a secondary battery. A secondary battery disclosed here has a lid having a liquid injection port, a resin washer attached to the liquid injection port, and a sealing member. The sealing member has a sleeve inserted into the liquid injection port and a flange extending from the sleeve along an outer surface of the lid in an outer diameter direction. The resin washer is installed in the liquid injection port and is sandwiched between the flange and the outer surface of the lid. A protrusion protruding toward the outer surface of the lid is provided at a radial intermediate portion of the flange. A restricting portion that restricts an outer edge of the resin washer is provided in the lid or the sealing member.

Abstract: Provided is a technique for accommodating current collector tabs joined to current collector terminals inside a battery case in a better state. The secondary battery disclosed herein has an electrode body, a battery case that accommodates the electrode body, and current collector terminals attached to the battery case. The electrode body has a plurality of current collector tabs. The plurality of current collector tabs have a portion where the current collector tabs are bundled in a stacked state and a portion joined to the current collector terminal.

Abstract: Wound positive-electrode core body exposed pails are bundled and connected to a positive-electrode collector body. A tape is affixed straddling a separator positioned on the outermost surface of a winding electrode body, and the outermost surface of the wound positive-electrode core body exposed parts. The tape has a porous base material and an adhesive layer provided on the base material. The tape has a region in which the adhesive layer b is not provided on the base material a between the connection part between the tape and the separator positioned on the outermost surface of the winding electrode body, and the connection part between the tape and the outermost surface of the wound positive-electrode core body exposed parts.

Abstract: An electricity storage device includes: an electrode body including at least one positive electrode plate, at least one negative electrode plate, and a separator. an insulating holder that is formed by folding a sheet made of an insulating material and accommodates therein the electrode body; an outer case which has an opening and accommodates therein the electrode body with the insulating holder and an electrolyte; and a sealing plate. The outer case has a bottom plate part and a plurality of side walls standing from the bottom plate part, and the opening is formed in a position to face the bottom plate part. The insulating holder has a plurality of side surface parts respectively facing the plurality of side walls, and a bottom surface part that faces the bottom plate part. At least one of the side surface parts or the bottom surface part has a bellow-folded structure.

Abstract: A terminal structure to be adopted for a power storage device including an outer case that has an opening, includes: a sealing plate sealing the opening; a terminal member inserted into a terminal hole formed in the sealing plate and electrically connected to an electrode; and a first insulating member arranged between the sealing plate and the terminal member, and arranged on an outer surface side of the sealing plate facing an outer side of the power storage device. The terminal member has a first extended part extending further outward than an outer periphery of the terminal hole on the outer side of the power storage device. A first protruding part or a second recessed part provided to the first insulating member and a first recessed part or a second protruding part provided to the sealing plate or to the first extended part fit with each other.

Abstract: A negative electrode terminal includes a flange, and a connection portion disposed on a first surface of the flange. The connection portion is inserted into a terminal attachment hole. The negative electrode terminal includes a first area made of aluminium or an aluminium alloy, and a second area made of copper or a copper alloy. In the flange, the second area is disposed adjacent to the first surface, and the first area is disposed adjacent to the second surface. A boundary between the first area and the second area is disposed between the first surface and the second surface. A thinnest portion of the first area of the flange in the thickness direction of the flange has a thickness of larger than or equal to 0.3 mm. An external electroconductive member made of aluminium or an aluminium alloy is welded to the flange to form a welded portion.

Abstract: A highly reliable secondary battery is provided, in which a short circuit between a positive electrode plate and a negative electrode plate is prevented. The negative electrode plate includes a negative electrode core and a negative electrode active material layer formed on the negative electrode core. An electrode assembly includes a negative electrode core-stacked portion including stacked layers of the negative electrode core, and the negative electrode core-stacked portion is joined to a first surface of the negative electrode current collector to form a joined portion. The irregularity-formed portion is formed on a second surface of the negative electrode current collector that is opposite to the first surface and is located in a portion of the negative electrode current collector in which the joined portion is formed. A sheet member used as a cover member is disposed on the second surface so as to cover the irregularity-formed portion.

Abstract: A method of manufacturing a secondary battery including a joining step of clamping a negative electrode core body stacked part and a negative electrode current collector by a horn and an anvil, and in a state where the anvil is in contact with the negative electrode current collector, ultrasonically joining the negative electrode core body stacked part and the negative electrode current collector to form a joint part; and an oxidation treatment step of oxidizing a portion, in contact with the anvil, of the negative electrode current collector in the joining step.