Abstract: An electrochemical device includes a storage element in which two types of electrodes are superposed on each other with a separator interposed therebetween and an outer container made of a flexible film that houses the storage element and an electrolyte solution, the two types of electrodes each including an active material-applied portion where an active material layer is formed on current collector 9, and an active material-non-applied portion, wherein each of the two types of electrodes is provided with an electrode terminal 7 and support tab 13, one end portion of electrode terminal 7 being superposed on the active material-non-applied portion of the electrode in the outer container, the other end portion of electrode terminal 7 extending to an outside of the outer container, support tab 13 sandwiching the active material-non-applied portion along with the one end portion of electrode terminal 7 in the outer container, and the active material-non-applied portion, electrode terminal 7, and support tab 13 a

Abstract: An electrochemical device includes a storage element in which two types of electrodes are superposed on each other with a separator interposed therebetween and an outer container made of a flexible film that houses the storage element and an electrolyte solution, the two types of electrodes each including an active material-applied portion where an active material layer is formed on current collector 9, and an active material-non-applied portion, wherein each of the two types of electrodes is provided with an electrode terminal 7 and support tab 13, one end portion of electrode terminal 7 being superposed on the active material-non-applied portion of the electrode in the outer container, the other end portion of electrode terminal 7 extending to an outside of the outer container, support tab 13 sandwiching the active material-non-applied portion along with the one end portion of electrode terminal 7 in the outer container, and the active material-non-applied portion, electrode terminal 7, and support tab 13 a

Abstract: A lithium-ion secondary battery includes: an electrode body in which a positive electrode and a negative electrode are stacked or wound through a separator; a plurality of positive electrode tabs drawn from the electrode body; a plurality of negative electrode tabs drawn from the electrode body; a joint portion between the positive electrode tabs and a positive electrode lead tab; and a joint portion between the negative electrode tabs and a negative electrode lead tab. Apart of a metal plate is disposed on a surface of the positive electrode tab or positive electrode lead tab in the joint portion and on a surface of the negative electrode tab or negative electrode lead tab in the joint portion and joined integrally thereto, and a remaining part of the metal plate is wound around the joint portions.

Abstract: The present invention provides a lamination type secondary battery in which separators are prevented from becoming wrinkled and are free from laminating dislocation. An aspect of the present invention is a lamination type secondary battery in which a plurality of planar positive electrodes (2) and negative electrodes (3) are alternately laminated. The lamination type secondary battery includes a plurality of pairs of separators (4?), an intermittent joining section (6), and an outer periphery joining section (7). Each pair of separators (4?) sandwiches and coats at least one among from the positive electrodes (2) and the negative electrodes (3). The intermittent joining section (6) is arranged at predetermined intervals along an outer periphery of each of the positive electrodes (2) or each of the negative electrodes (3). The intermittent joining section (6) is a section that joins the pair of separators (4?).

Abstract: A lithium-ion secondary battery includes: an electrode body in which a positive electrode and a negative electrode are stacked or wound through a separator; a plurality of positive electrode tabs drawn from the electrode body; a plurality of negative electrode tabs drawn from the electrode body; a joint portion between the positive electrode tabs and a positive electrode lead tab; and a joint portion between the negative electrode tabs and a negative electrode lead tab. Apart of a metal plate is disposed on a surface of the positive electrode tab or positive electrode lead tab in the joint portion and on a surface of the negative electrode tab or negative electrode lead tab in the joint portion and joined integrally thereto, and a remaining part of the metal plate is wound around the joint portions.

Abstract: The invention provides a closed type battery comprising a battery element covered with a covering film and a heat fusion seal portion formed by heat fusion on a periphery of the covering film, wherein the cleaving strength upon an internal pressure rise of a seal portion positioned between a positive electrode terminal and a negative electrode terminal is larger than that of any other seal portion, and a safety valve adapted to release pressure upon a battery's internal pressure rise is located at a portion other than said inter-terminal seal portion. The invention also provides an assembled battery wherein a plurality of closed type batteries are stacked one upon another while a safety valve adapted to release pressure upon an increase in the internal pressure of the battery is located at a position in no contact with the covering film surface of an adjoining battery.

Abstract: The invention provides a closed type battery comprising a battery element covered with a covering film and a heat fusion seal portion formed by heat fusion on a periphery of the covering film, wherein the cleaving strength upon an internal pressure rise of a seal portion positioned between a positive electrode terminal and a negative electrode terminal is larger than that of any other seal portion, and a safety valve adapted to release pressure upon a battery's internal pressure rise is located at a portion other than said inter-terminal seal portion. The invention also provides an assembled battery wherein a plurality of closed type batteries are stacked one upon another while a safety valve adapted to release pressure upon an increase in the internal pressure of the battery is located at a position in no contact with the covering film surface of an adjoining battery.

Abstract: The invention provides a closed type battery comprising a battery element covered with a covering film and a heat fusion seal portion formed by heat fusion on a periphery of the covering film, wherein the cleaving strength upon an internal pressure rise of a seal portion positioned between a positive electrode terminal and a negative electrode terminal is larger than that of any other seal portion, and a safety valve adapted to release pressure upon a battery's internal pressure rise is located at a portion other than said inter-terminal seal portion. The invention also provides an assembled battery wherein a plurality of closed type batteries are stacked one upon another while a safety valve adapted to release pressure upon an increase in the internal pressure of the battery is located at a position in no contact with the covering film surface of an adjoining battery.

Abstract: A method for production of a stacked battery having a step of determining in advance a simultaneously bondable number of electrode current collection tabs and a step of forming groups of current collection tabs, and a step of displacing the bonding positions of the groups of positive electrode current collection tabs or those of negative electrode current collection tabs relative to each other in the direction of drawing out the positive electrode current collection tabs or the negative electrode current collection tabs, or in the direction perpendicular to the direction and collectively bonding the positive electrode current collection tabs or the negative electrode current collection tabs, of each group under the bonding conditions.

Abstract: A stacked secondary cell suppresses heat contraction of the opening of a sack-shaped separator even in a high-temperature environment and prevents the occurrence of short circuits between the stacked electrodes. In the disclosed stacked secondary cell, positive electrodes (13) and negative electrodes each having a lead-out terminal (2) are alternately stacked with interposed separators (15). Of positive electrodes (13) and negative electrodes, at least electrodes of one polarity are each housed in sack-shaped separator sacks (15) each formed by two sheet-shaped separators that are bonded together with an opening (3) in one portion. Further, the lead-out terminal (2) of the electrode (13) that is housed in the separator sack (15) protrudes through the opening (3) to the exterior of the separator sack (15), and the outer periphery of the opening (3) is covered by an electric insulating layer (8).

Abstract: The present invention provides a lamination type secondary battery in which separators are prevented from becoming wrinkled and are free from laminating dislocation. An aspect of the present invention is a lamination type secondary battery in which a plurality of planar positive electrodes (2) and negative electrodes (3) are alternately laminated. The lamination type secondary battery includes a plurality of pairs of separators (4?), an intermittent joining section (6), and an outer periphery joining section (7). Each pair of separators (4?) sandwiches and coats at least one among from the positive electrodes (2) and the negative electrodes (3). The intermittent joining section (6) is arranged at predetermined intervals along an outer periphery of each of the positive electrodes (2) or each of the negative electrodes (3). The intermittent joining section (6) is a section that joins the pair of separators (4?).

Abstract: A stacked battery includes a square battery element in which a tabular positive electrode, a separator and a tabular negative electrode are laminated, wherein: one side of the battery element is a terminal connection section pulled-out surface, which is provided on both the positive and negative electrodes and where a plate-like positive-electrode terminal connection section and a plate-like negative-electrode terminal connection are both pulled out; projection surfaces, which are generated by vertically projecting the positive-electrode terminal connection section and the negative-electrode terminal connection section onto surfaces extending from the positive and negative electrodes, do not cross each other; a surface of the positive electrode and a surface of the negative electrode, which are facing each other, are different in area; each electrode is disposed so that an entire projection portion, which is generated by projecting the small-area electrode onto a surface of a large-area electrode that faces t

Abstract: In a stacked secondary battery, positive electrodes 5 and negative electrodes 4, which are formed by integrally forming a positive electrode collector tab 57 and a negative electrode collector tab 47 on a metal foil positive electrode collector 51 and a metal foil negative electrode collector 41, respectively, are stacked together with separators 6 disposed in-between. The separator 6 is also disposed between the opposing parts 8 of the positive electrode collector tab and the negative electrode collector tab. A positive electrode lead 17 and a negative electrode lead 15, connected to the positive electrode collector tab and the negative electrode collector tab, respectively, extend out from the same end surface of the stack of the positive electrodes 5 and the negative electrodes 4 and are drawn out from an outer casing 3.

Abstract: A stacked lithium ion secondary battery is characterized in that: a positive terminal is taken out from positive electrodes of a battery element stack in which the positive electrodes and negative electrodes are stacked via separators; a negative terminal is taken out from the negative electrodes; the battery element stack, except the taken-out portions of the positive and negative terminals, is covered with a porous plastic film; and an opening of the battery element stack covered with the porous plastic film is sealed with a film-like covering material.

Abstract: A stacked secondary battery having desirable characteristics against overcharging is provided. In the stacked secondary battery, either of a planar positive electrode or a planar negative electrode is contained in a pouch-shaped separator oriented such that the direction in which a positive lead terminal or a negative lead terminal is drawn out is aligned with a machine direction of the separator; a synthetic resin film is applied to the pouch-shaped separator across an edge of a joint area on both sides of the separator, the synthetic resin film having an adhesion strength higher than the stress caused by thermal contraction of the separator and having a softening point higher than that of the separator; and the positive electrode or the negative electrode that is contained in the pouch-shaped separator is stacked with a counter electrode that is not contained in the separator in an opposed manner to form a stacked battery element, which in turn is sealed in a film-like casing.

Abstract: A stacked secondary battery is formed by laying plate-shaped positive electrodes and plate-shaped negative electrodes one on the other by way of separators, wherein a collector is disposed at the front end of the end facet of each of the positive electrodes or the negative electrodes as viewed in a direction orthogonal relative to the stacking direction and has an active substance layer formed on the collector by applying slurry of particles of an active substance with a gap separating it from the front end or the electrode active substance layer is made to show a thickness varying from the front end toward the inside.

Abstract: A method for production of a stacked battery having a plurality of positive electrode current collection tabs and a plurality of negative electrode current collection tabs drawn out from a stacked member formed by laying positive electrodes and negative electrodes alternately one on the other with separators interposed between them and bonded respectively to a positive lead terminal and a negative lead terminal comprises a step of determining in advance a simultaneously bondable number, or the number of positive electrode current collection tabs and the number of negative electrode current collection tabs that can be laid one on the other and collectively bonded, and bonding conditions for bonding them and a step of forming groups of current collection tabs, each group being formed by laying a number of current collection tabs not exceeding the simultaneously bondable number one on the other, displacing the bonding positions of the groups of positive electrode current collection tabs or those of negative elec

Abstract: The invention provides a closed type battery comprising a battery element covered with a covering film and a heat fusion seal portion formed by heat fusion on a periphery of the covering film, wherein the cleaving strength upon an internal pressure rise of a seal portion positioned between a positive electrode terminal and a negative electrode terminal is larger than that of any other seal portion, and a safety valve adapted to release pressure upon a battery's internal pressure rise is located at a portion other than said inter-terminal seal portion. The invention also provides an assembled battery wherein a plurality of closed type batteries are stacked one upon another while a safety valve adapted to release pressure upon an increase in the internal pressure of the battery is located at a position in no contact with the covering film surface of an adjoining battery.