Abstract: A battery disclosed herein includes a wound electrode body, a battery case having a substantially rectangular first surface, and an electrolytic solution injection hole formed on the first surface of the battery case, a sealing member for sealing the electrolytic solution injection hole, and an insulating member fixed to the first surface. The electrolytic solution injection hole is formed in a position that does not overlap with vertexes of the curved portions of the plurality of wound electrode bodies. Herein, a part of the insulating member is disposed in a valley portion surrounded by a surface linking the vertexes of the adjacent wound electrode bodies and the curved surface of the curved portion of the adjacent wound electrode bodies, and a part of the sealing member is disposed in the valley portion.

Abstract: A method of manufacturing a secondary battery of a present disclosure includes a sealing step. At the sealing step, regarding a first area pressed by a pressing jig on a center in width directions of a pair of first side walls, a second area positioned at a sealing plate side more than the first area, and a third area positioned at a bottom part side more than the first area, in a case where distances in a thickness direction of the battery case directed from an outer surface of one of the first side walls toward an outer surface of the other one of the first side walls are respectively treated as T1, T2, and T3, the pair of first side walls are pressed by a pressing jig to make maximum values of them satisfy T2>T3>T1 to seal a liquid injection hole.

Abstract: The secondary battery includes an electrode body that includes a positive electrode plate and a negative electrode plate, an outer body that has an opening and houses the electrode body, a sealing plate that seals the opening of the outer body, a positive electrode tab that is provided in the positive electrode plate, a positive electrode external terminal that is electrically connected to the positive electrode plate and attached to the sealing plate, and a positive electrode current collector and a second positive electrode current collector that electrically connect the positive electrode tab and the positive electrode external terminal. The first positive electrode current collector has a current collector protrusion. The second positive electrode current collector has a current collector opening. The current collector protrusion is positioned in the current collector opening. The current collector protrusion and the edge of the current collector opening are weld connected to each other.

Abstract: A rectangular secondary battery includes a rectangular casing that contains an electrode body, a sealing plate that seals an opening of the rectangular casing; a positive electrode tab group that is composed of a plurality of positive electrode tabs, a positive electrode terminal that is electrically connected to the positive electrode tab group and attached to the sealing plate, a second positive electrode current collector that is electrically connected to the positive electrode tab group and the positive electrode terminal, and a second insulator that is disposed between the sealing plate and the second positive electrode current collector. The sealing plate has a gas discharge valve. The sealing plate has a first recess. The second insulator has a first protrusion. In a transversal direction of the sealing plate, the first recess is displaced from a center of the sealing plate toward an end portion of the sealing plate.

Abstract: A herein disclosed terminal includes a first conductive member and a second conductive member that is electrically connected to the first conductive member. The first conductive member and the second conductive member are composed of mutually different metals. The first conductive member includes a penetration hole. The second conductive member is arranged to cover the penetration hole. Then, a boundary part between a vicinity of the penetration hole of the first conductive member and the second conductive member is covered with a tape and/or a resin member to prevent the boundary part from being exposed.

Abstract: A battery disclosed herein includes: an electrode body including a positive electrode and a negative electrode; an electrolytic solution; a battery case housing the electrode body, storing the electrolytic solution, and including an electrolytic solution injection hole; and a sealing member connected to a portion of the battery case defining a peripheral edge of the electrolytic solution injection hole, such that the electrolytic solution injection hole is sealed with the sealing member. A surface of the battery case facing the electrode body includes a protrusion located around the electrolytic solution injection hole and protruding toward the electrode body.

Abstract: A secondary battery includes a battery case housing a flat electrode body and a sealing plate. The electrode body is housed in the battery case such that a winding axis thereof is parallel with a longitudinal direction of the sealing plate. At an end portion of the electrode body in a winding axis direction thereof, an edge of a positive or negative electrode plate is connected to an external terminal fixed to the sealing plate through a current collector. An insulating pressing member is arranged between the sealing plate and the electrode body. The pressing member presses the electrode body in a direction perpendicular to the winding axis such that a distance between a portion of the electrode body contacting the pressing member and the sealing plate is longer than a distance between the end portion of the electrode body in the winding axis direction thereof and the sealing plate.

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 an electrode body element fabricating step in which a first electrode body element including a positive electrode plate and a negative electrode plate, and a second electrode body element including a positive electrode plate and a negative electrode plate are fabricated, a tab-connecting step in which a first positive electrode tab group of the first electrode body element and a second positive electrode tab group of the second electrode body element are connected to a second positive electrode collector, and a first negative electrode tab group of the first electrode body element and a second negative electrode tab group of the second electrode body element are connected to a second negative electrode collector, and an electrode body fabricating step in which, after the tab-connecting step, the first electrode body element and the second electrode body element are unified.

Abstract: A conductive member is disposed on a side of the sealing plate adjacent to an electrode assembly with a first insulating member disposed therebetween. The conductive member has a conductive-member opening portion. The conductive-member opening portion of the conductive member is sealed by a deformation plate. The deformation plate is connected to a first positive-electrode current collector, which is electrically connected to positive electrode plates. A second insulating member is disposed between the deformation plate and the first positive-electrode current collector. Fixing projections and displacement prevention projections are provided on a surface of the second insulating member. The second insulating member is fixed to the first positive-electrode current collector such that the fixing projections are disposed in fixing holes in the first positive-electrode current collector.

Abstract: Provided is technique to suppress inside short circuit of a battery. A herein disclosed battery includes an electrode body, a battery case, and a first electrical collector member. The electrode body includes a first electrode, a second electrode, and a first electrode tab group connected to the first electrode. The battery case includes an outer package and a sealing plate. The outer package is configured to accommodate the electrode body and includes an opening. The sealing plate is configured to seal the opening. The first electrical collector member is connected to the first electrode tab group. The first electrical collector member includes a first area that is arranged along a surface at the electrode body side of the sealing plate. A first insulating member is arranged between the sealing plate and the first area. A second insulating member is arranged between the first area and the electrode body.

Abstract: A method of manufacturing a secondary battery including an electrode body element fabricating step in which a first electrode body element including a positive electrode plate and a negative electrode plate, and a second electrode body element including a positive electrode plate and a negative electrode plate are fabricated, a tab-connecting step in which a first positive electrode tab group of the first electrode body element and a second positive electrode tab group of the second electrode body element are connected to a second positive electrode collector, and a first negative electrode tab group of the first electrode body element and a second negative electrode tab group of the second electrode body element are connected to a second negative electrode collector, and an electrode body fabricating step in which, after the tab-connecting step, the first electrode body element and the second electrode body element are unified.

Abstract: A conductive member is disposed on a side of the sealing plate adjacent to an electrode assembly with a first insulating member disposed therebetween. The conductive member has a conductive-member opening portion. The conductive-member opening portion of the conductive member is sealed by a deformation plate. The deformation plate is connected to a first positive-electrode current collector, which is electrically connected to positive electrode plates. A second insulating member is disposed between the deformation plate and the first positive-electrode current collector. Fixing projections and displacement prevention projections are provided on a surface of the second insulating member. The second insulating member is fixed to the first positive-electrode current collector such that the fixing projections are disposed in fixing holes in the first positive-electrode current collector.

Abstract: A technology for obtaining a battery including a wound electrode body with high productivity is provided. In a preferred aspect of the battery manufacturing method disclosed herein, the method includes: winding a separator, a first electrode, and a second electrode around a winding core to produce a wound body; molding the wound body into a flat shape; and arranging, in a battery case, the wound electrode body produced.

Abstract: A highly reliable battery where multiple tabs and current collecting units are stably connected is provided. In a preferred aspect of the battery disclosed herein, in an electrode body, a first tab and a third tab are arranged such that the middle of the base width of the first tab and the middle of the base width of the third tab are displaced from each other in the perpendicular direction, and a second tab and a fourth tab are arranged such that the middle of the base width of the second tab and the middle of the base width of the fourth tab are displaced from each other in the perpendicular direction.

Abstract: Provided is a technique increasing the capacity of secondary batteries. According to the technique disclosed herein, there is provided a secondary battery having a flat wound electrode body in which a first electrode and a second electrode different from the first electrode are laminated and wound with a separator interposed therebetween, and a first current collecting member. The wound electrode body has a plurality of first electrode tabs. Ten or more first electrode tabs are provided and stacked. In a thickness direction of the wound electrode body, a ratio (N1A/N1B) of the number N1A of stacked layers of the first electrode tabs and the number N1B of stacked layers of the first electrode satisfies 0.3 to 0.7. The plurality of first electrode tabs are bent and connected to the first electrode current collecting member.

Abstract: Provided is art that allows joining an external conductive member and a bus bar more stably. A method for producing a secondary battery disclosed herein has: an attachment step; an arrangement step; a covering step; and, a joining step. The external conductive member has a recess sunk from the upper surface, around a through-hole. In the joining step, the external conductive member and the terminal are joined in a state where an edge portion of a cover member is disposed between a planned joint portion, and an outer peripheral edge of the recess, in a cross-sectional view along a direction of penetration into the through-hole.

Abstract: A method of manufacturing a secondary battery includes the following steps. An insertion portion of a negative-electrode terminal is inserted into a terminal connection hole that is formed in a first negative-electrode current collector and crimped on a tapered portion to form a crimped portion. A gap is formed between the crimped portion and the tapered portion. Energy rays are radiated toward at least one of the crimped portion and the tapered portion to melt the at least one of the crimped portion and the tapered portion such that a melted metal flows into the gap. The melted metal is solidified to form a solidified portion, and the negative-electrode terminal and the first negative-electrode current collector are joined to each other. The solidified portion has a recessed portion.

Abstract: A battery whose reliability is suitably enhanced and a manufacturing method of the battery are provided. The manufacturing method of the battery herein disclosed includes a fitting step for abutting at least a portion of an outer package and a sealing plate, and deforming the outer package and/or the sealing plate so as to fit the outer package and the sealing plate, and a joining step for joining the outer package and the sealing plate.

Abstract: A battery is provided in which a damage on an electrode tab group is suitably inhibited. In one suitable embodiment of the battery herein disclosed, an insulating member is provided on a sealing plate. An insulation sheet arranged to cover an electrode body is joined to the insulating member, and the insulation sheet includes a sheet bottom wall, a pair of sheet first side walls that are configured to extend from the sheet bottom wall and are opposed mutually, and a pair of sheet second side walls that extend from the sheet bottom wall and are opposed mutually.