Abstract: A method of manufacturing a case for a secondary battery includes: bending a metal plate having a first end side and a second end side into a tubular shape such that the first end side and the second end side are close to each other; forming a joining portion that joins the first end side and the second end side to each other by applying a high-energy ray to the first end side and the second end side; and forming a fragile portion by applying the high-energy ray to the metal plate at a position separated from the first end side and the second end side.

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 first positive electrode tab group that is composed of a plurality of positive electrode tabs, a positive electrode terminal that is attached to the sealing plate, a second positive electrode current collector that constitutes a positive electrode current collector member that is electrically connected to the first positive electrode tab group and the positive electrode terminal, and a second insulator. The second insulator includes a base portion that is disposed between the sealing plate and the second positive electrode current collector. The first positive electrode tab group is bent and connected to the second positive electrode current collector, the region being disposed along the sealing plate. A first wall portion is disposed between the first positive electrode tab group and the rectangular casing.

Abstract: In the present secondary battery, a first spacer is disposed in a first opening of a case main body between a first sealing plate and an electrode assembly, the first spacer includes a first protrusion facing the first electrode tab, and the first electrode tab is curved and bent to be provided with a recess recessed at a position facing the first protrusion. With this configuration, an energy density of the secondary battery can be improved, thereby stably manufacturing the secondary battery.

Abstract: A first electrode assembly has a first electrode tab and a second electrode tab. A second electrode assembly has a third electrode tab and a fourth electrode tab. The first electrode tab is joined to a first current collector. The second electrode tab is joined to a second current collector. The third electrode tab is joined to a third current collector. The fourth electrode tab is joined to a fourth current collector. The first current collector and the third current collector are constituted of separate components. The second current collector and the fourth current collector are constituted of separate components.

Abstract: A method of manufacturing a secondary battery includes: after producing a first electrode assembly and a second electrode assembly, electrically connecting a second electrode tab and a fourth electrode tab to a second current collector with the first electrode assembly being disposed on one side with respect to the second current collector and the second electrode assembly being disposed on the other side with respect to the second current collector; and after joining the second electrode tab and the fourth electrode tab, bending the second electrode tab and the fourth electrode tab such that the first electrode tab and the third electrode tab face each other so as to overlap the first electrode assembly and the second electrode assembly with each other.

Abstract: In a secondary battery, a first current collecting member has a first region extending along a first wall, a second region extending in a direction intersecting the first wall, and a first folded portion provided between the first region and the second region, the second current collecting member has a third region extending along the first wall, a fourth region extending in the direction intersecting the first wall, and a second folded portion provided between the third region and the fourth region, the first region and the third region are disposed to overlap with each other, the first region is located on the electrode assembly side with respect to the third region, a first electrode tab is connected to the first region, and the second region and the fourth region are joined to each other.

Abstract: In a method of manufacturing a secondary battery, joining a first current collecting member and a second current collecting member includes joining the first current collecting member and the second current collecting member by applying a high-energy ray to at least one of the first current collecting member and the second current collecting member from between a case main body and a first sealing plate.

Abstract: The present secondary battery includes: a first spacer disposed to face a first electrode tab; a second spacer disposed to face the second electrode tab; and an insulating sheet disposed to cover the electrode assembly, the first spacer, and the second spacer, wherein the insulating sheet and the first spacer are connected to each other, and the insulating sheet and the second spacer are connected to each other.

Abstract: A secondary battery disclosed herein includes: an electrode body; a battery case; a terminal extracted from a terminal extracting hole to outside of the battery case; and an external conductive member joined to the terminal. The external conductive member has a through-hole into which a part of the terminal is inserted, and a joining portion between the external conductive member and the terminal is formed at a peripheral edge of the through-hole. The external conductive member has an approximately annular thin portion provided around the joining portion, and the thin portion is configured to melt when a current of 1000 A or more flows through the secondary battery.

Abstract: A conductive member (61) is disposed near a side of the sealing plate (2) facing the inside of a battery with a first insulating member (10) disposed therebetween. The conductive member (61) has a conductive-member opening portion (61f) at a side facing the electrode assembly. An inserting portion (7b) of a positive electrode terminal (7) is inserted through a third terminal-receiving hole (61c) in the conductive member (61) and connected to the conductive member (61). The conductive-member opening portion (61f) of the conductive member (61) is sealed by a deformation plate (62), and the deformation plate (62) is connected to a first positive-electrode current collector (6a), which is electrically connected to positive electrode plates. The conductive member (61) includes a pressing projection (61e) that projects toward the first insulating member (10) from a portion thereof that faces the first insulating member (10).

Abstract: A rectangular secondary battery including a sealing plate. The scaling plate has a first fitting recess that is nearer than a positive electrode terminal attachment hole to a center of the sealing plate and a second fitting recess that is nearer than the positive electrode terminal attachment hole to an end portion of the sealing plate. The first fitting recess and the second fitting recess are disposed at positions that are displaced from the center of the sealing plate in a transversal direction of the sealing plate. A first fitting protrusion and a second fitting protrusion of a second outer insulator are respectively disposed in the first fitting recess and the second fitting recess.

Abstract: The herein disclosed electric storage device 1 includes a case, an insulating material, and a current collector. The current collector is arranged to cover a terminal attachment hole via an insulating material 30, is joined to the insulating material. The current collector includes a terminal part exposed to an outer side of the case through the terminal attachment hole, and can be electrically connected to an outside member. Then, the terminal part is positioned at an inward more than an outer surface of the case. In accordance with such a configuration, it is possible to implement forming an electrically conductive passage to an outside of the case and hermetically sealing an inside of the case, and it is possible to enhance the loading efficiency of the electric product.

Abstract: A case main body includes a pair of first walls and a pair of second walls, the pair of first walls facing each other in a second direction orthogonal to a first direction, the pair of second walls facing each other in a third direction orthogonal to the first direction and the second direction, an area of each of the pair of first walls being larger than an area of each of the pair of second walls, one of the pair of second walls is provided with a gas-discharge valve that is fractured when pressure in the case becomes equal to or more than a predetermined value, and the other of the pair of second walls is provided with a joining portion extending in the first direction.

Abstract: A battery is provided in which an electrode tab group is hardly damaged. In the herein disclosed battery, an electrode body includes an electrode body main body part, a positive electrode tab group protruding from a first end part, and a negative electrode tab group protruding from a second end part. The positive electrode tab group and the negative electrode tab group are folded and bent to make tip ends of electrode tabs respectively configuring these tab groups be arranged along a second side wall of the battery case. A portion of the folded and bent electrode tab is joined to the electrical collector body of the same pole. The battery includes a spacer between the electrode body main body part and the second side wall, and the spacer is to regulate movement of the electrode body.

Abstract: Disclosed here is a battery including: an exterior body having a bottom wall; and a winding electrode body in which positive electrode, negative electrode and separator are wound about a winding axis. The winding electrode body has a flat shape having a pair of curvature parts having a curved outside surface and a flat part that connects the pair of curvature parts to each other and has a flat outside surface. When a line perpendicular to the winding axis of the winding electrode body and perpendicular to the bottom wall of the exterior body is assumed as L1, a portion positioned at an outermost periphery of the negative electrode in at least one of the pair of the curvature parts faces a portion positioned on a winding inner peripheral side of the negative electrode via the separator and not via the positive electrode on the line L1.

Abstract: A terminal includes a first conductive member formed of a first metal and a second conductive member formed of a second metal that is different from the first metal. The second conductive member includes a flange portion and a shaft portion provided on one surface of the flange portion. The second conductive member includes a first metal joining portion metallically joined to the first conductive member on an upper surface of the flange portion. The second conductive member includes a protrusion at a side closer to an outer periphery than the first metal joining portion. The first conductive member includes a first recessed portion that is fitted to the protrusion. The second conductive member includes a second metal joining portion where the first conductive member and the second conductive member are metallically joined to each other at the first recessed portion and the protrusion.

Abstract: A terminal includes a first conductive member and a second conductive member. The first conductive member includes a first recessed portion. The second conductive member includes a flange portion and a shaft portion. At least a portion of the flange portion is arranged in the first recessed portion. The first conductive member includes a metal joining portion metallically joined to the flange portion. The flange portion includes a large diameter portion and a small diameter portion. An outer diameter of the small diameter portion is equal to or less than 9/10 of an outer diameter of the large diameter portion. An outer peripheral side surface of the small diameter portion includes a fastening portion mechanically fastened to an inner surface of the first recessed portion.

Abstract: An electricity storage device includes an electrode body, a case, a terminal, and a current collecting member. The terminal includes a first conductive member and a second conductive member. The first conductive member includes a recessed portion in a first surface. The first conductive member includes a fastening portion and a metal joining portion. The second conductive member includes a flange portion and a coupling portion. A distal end of the coupling portion includes a diameter extended portion. The diameter extended portion is coupled to the current collecting member. A portion of the flange portion is arranged in the recessed portion of the first conductive member. An outer peripheral edge of the first conductive member and an outer peripheral edge of the flange portion are located in an approximately same position in a radial direction of the flange portion.

Abstract: The present disclosure provides a terminal including a first conductive member that is formed of a first metal and includes a concave part, a second conductive member that is formed of a second metal and includes a part disposed in the concave part, and an ultrasonic bonding part where the first conductive member and the second conductive member are bonded to each other with ultrasonic waves. The first conductive member includes a rib that is provided on an outer peripheral side relative to the ultrasonic bonding part and that protrudes from a second surface of the first conductive member.

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 first positive electrode tab group that is composed of a plurality of positive electrode tabs, a positive electrode terminal that is attached to the sealing plate, a second positive electrode current collector that constitutes a positive electrode current collector member that is electrically connected to the first positive electrode tab group and the positive electrode terminal, and a second insulator. The second insulator includes a base portion that is disposed between the sealing plate and the second positive electrode current collector. The first positive electrode tab group is bent and connected to the second positive electrode current collector, the region being disposed along the sealing plate. A first wall portion is disposed between the first positive electrode tab group and the rectangular casing.