Abstract: A non-aqueous electrolyte secondary battery of the present invention comprises a long core member and a material mixture layer formed thereon. The electrode plate has an exposed part of the core member formed along one side which is parallel to the longitudinal direction of the core member. The material mixture layer comprises a material that can absorb and desorb lithium ions. A porous film is formed on at least a part of the exposed part of the core member adjacent to an edge face of the material mixture layer and on the material mixture layer and is parallel to the exposed portion of the core member, and the thickness of the porous film is greater at the edge face of the material mixture layer which is parallel to the exposed part of the core member and located on the side of the exposed part of the core member than at a central portion of the material mixture layer in the width direction thereof.

Abstract: A sealed battery includes an electrode group formed by winding or stacking a positive electrode including a current collector carrying an active material layer thereon, a negative electrode including a current collector carrying an active material layer thereon and a separator interposed therebetween. The current collectors of the positive and negative electrodes are exposed at an end thereof and the exposed ends are welded to current collector terminals, respectively. The active material layers formed on the surfaces of the current collectors are covered with heat resistant porous films, respectively. An end face of the separator is flush with or positioned inside relative to end faces of the heat resistant porous films. The heat resistant porous films have a melting point higher than that of the separator and have a thermal conductivity lower than that of the current collectors.

Abstract: A safety mechanism for a laminate battery. An exterior case (5) consists of two molded sheets (5a) made of laminate sheets, superposed upon one another, and bonded together around the outer edges. The exterior case has a protrusion (10) that communicates with the interior of the exterior case and protrudes outwardly from one side. A safety vent (13) is made up of an exhaust hole (11) formed in at lease one of the two molded sheets (5a) in the protrusion (10), and a valve element (12) making elastic pressure contact with the edge of the exhaust hole (11) to seal it. The safety mechanism does not operate within the range of internal pressure variation during normal use, but operates reliably at a time point when a predetermined valve operating pressure is reached to release a necessary amount of gas to the outside, this valve operating pressure being within the safe range relative to the pressure resistance of the exterior case (5) made of laminate sheets.

Abstract: A lithium ion secondary battery which includes: a negative electrode plate 406 in which a negative electrode mixture layer 404 is formed on each of both surfaces of a negative electrode current collector 401 containing copper as a principle component and having a sheet shape; a positive electrode plate 407 in which a positive electrode mixture layer 405 is formed on each of both surfaces of a positive electrode current collector 402 containing aluminum as a principle component and having a sheet shape; and a separator 403 holding an electrolyte. The negative electrode plate 406, the positive electrode plate 407 and the separator 403 are spirally wound or stacked. The thickness of the positive electrode current collector 402 is smaller than the thickness of the negative electrode current collector 401.

Abstract: A non-aqueous electrolyte secondary battery of the present invention comprises a long core member and a material mixture layer formed thereon. The electrode plate has an exposed part of the core member formed along one side which is parallel to the longitudinal direction of the core member. The material mixture layer comprises a material that can absorb and desorb lithium ions. A porous film is formed on at least a part of the exposed part of the core member adjacent to an edge face of the material mixture layer and on the material mixture layer and is parallel to the exposed portion of the core member, and the thickness of the porous film is greater at the edge face of the material mixture layer which is parallel to the exposed part of the core member and located on the side of the exposed part of the core member than at a central portion of the material mixture layer in the width direction thereof.

Abstract: An active material layer 2 is applied on a current collector 1 so as to expose respective end parts of the current collector 1. A first active material layer non-formation part 1a at one of the end parts of the current collector 1 is formed narrower than a second active material layer non-formation part 1b at the other end part thereof. Next, a porous film 3 is formed on the current collector 1 to cover the active material layer 2. In this formation, the porous film 3 covers the edge surface of the active material layer 2 at the first non-formation part 1a while exposing a part of the second non-formation part 1b of the current collector 1.

Abstract: In a non-aqueous electrolyte secondary battery, a positive electrode in which a positive electrode active material includes a lithium-containing composite oxide, a peak pore size in a positive electrode material mixture layer is 0.7 ?m or less and a pore volume per unit weight of the positive electrode active material in the positive electrode material mixture layer is 0.05 cm3/g or more and 0.3 cm3/g or less; or a negative electrode in which a negative electrode active material includes a carbon material, a peak pore size in a negative electrode material mixture layer is 0.7 ?m or less, and a pore volume per unit weight of the negative electrode active material in the negative electrode material mixture layer is 0.2 cm3/g or more and 0.4 cm3/g or less are used.

Abstract: A sealed battery includes an electrode group formed by winding or stacking a positive electrode including a current collector carrying an active material layer thereon, a negative electrode including a current collector carrying an active material layer thereon and a separator interposed therebetween. The current collectors of the positive and negative electrodes are exposed at an end thereof and the exposed ends are welded to current collector terminals, respectively. The active material layers formed on the surfaces of the current collectors are covered with heat resistant porous films, respectively. An end face of the separator is flush with or positioned inside relative to end faces of the heat resistant porous films. The heat resistant porous films have a melting point higher than that of the separator and have a thermal conductivity lower than that of the current collectors.

Abstract: A lithium ion secondary battery including: an electrode group including a belt-like positive electrode and a belt-like negative electrode that are wound with a separator interposed therebetween; and a can with a bottom for accommodating the electrode group, wherein the positive electrode has a positive electrode current collector and a positive electrode mixture layer carried on the positive electrode current collector, the negative electrode has a negative electrode current collector and a negative electrode mixture layer carried on the negative electrode current collector, and a porous heat-resistant layer is partially provided between the separator and at least one of the positive electrode mixture layer and the negative electrode mixture layer. Since a porous heat-resistant layer is thus placed, a high performance lithium ion secondary battery capable of efficiently preventing internal short circuit due to overheating while preventing decrease in battery characteristics can be provided.

Abstract: A lithium ion secondary battery which includes: a negative electrode plate 406 in which a negative electrode mixture layer 404 is formed on each of both surfaces of a negative electrode current collector 401 containing copper as a principle component and having a sheet shape; a positive electrode plate 407 in which a positive electrode mixture layer 405 is formed on each of both surfaces of a positive electrode current collector 402 containing aluminum as a principle component and having a sheet shape; and a separator 403 holding an electrolyte. The negative electrode plate 406, the positive electrode plate 407 and the separator 403 are spirally wound or stacked. The thickness of the positive electrode current collector 402 is smaller than the thickness of the negative electrode current collector 401.

Abstract: A safety mechanism for a laminate battery. An exterior case (5) consists of two molded sheets (5a) made of laminate sheets, superposed upon one another, and bonded together around the outer edges. The exterior case has a protrusion (10) that communicates with the interior of the exterior case and protrudes outwardly from one side. A safety vent (13) is made up of an exhaust hole (11) formed in at lease one of the two molded sheets (5a) in the protrusion (10), and a valve element (12) making elastic pressure contact with the edge of the exhaust hole (11) to seal it. The safety mechanism does not operate within the range of internal pressure variation during normal use, but operates reliably at a time point when a predetermined valve operating pressure is reached to release a necessary amount of gas to the outside, this valve operating pressure being within the safe range relative to the pressure resistance of the exterior case (5) made of laminate sheets.

Abstract: A lithium ion secondary battery includes an electrode assembly configured such that positive and negative plates are wound or stacked with a separator interposed therebetween. The positive plate is configured such that positive-electrode mixture layers are formed on both surfaces of a positive-electrode current collector. The negative plate is configured such that negative-electrode mixture layers are formed on both surfaces of a negative-electrode current collector. The positive-electrode mixture layers formed on the positive plate each have a larger porosity than the negative-electrode mixture layers formed on the negative plate. A more refractory porous layer 1 than the separator is formed between the negative plate and the separator. The porous layer is made of a material for retaining an electrolyte.

Abstract: A battery operated device is equipped with one or more batteries each including a positive electrode, a negative electrode, a separator, and an electrolyte in a battery case. In this battery operated device, the battery has a gas vent that is opened due to an increase in pressure inside the battery case, and is configured to dispose the gas vent at a lower position thereof when installed in the battery operated device. Therefore, the battery function is ceased due to actuation of the gas vent.

Abstract: A lithium ion secondary battery including: an electrode group including a belt-like positive electrode and a belt-like negative electrode that are wound with a separator interposed therebetween; and a can with a bottom for accommodating the electrode group, wherein the positive electrode has a positive electrode current collector and a positive electrode mixture layer carried on the positive electrode current collector, the negative electrode has a negative electrode current collector and a negative electrode mixture layer carried on the negative electrode current collector, and a porous heat-resistant layer is partially provided between the separator and at least one of the positive electrode mixture layer and the negative electrode mixture layer. Since a porous heat-resistant layer is thus placed, a high performance lithium ion secondary battery capable of efficiently preventing internal short circuit due to overheating while preventing decrease in battery characteristics can be provided.

Abstract: The invention provides a lead acid storage battery with a high utilization at a high rate discharge by incorporating a lead ion solubility adjusting agent into the electrolyte. The agent is selected from polysaccharides, chelating agents, their derivatives, and hydrazinium sulfate.

Abstract: Electrode plates for a lead-acid battery have an active material layer using polyvinylidene fluoride as a binder formed on both sides of a substrate. The substrate is selected from the group consisting of a foil-like sheet made of pure lead or lead alloy and a polyester film that is lead-plated or covered with a conductive coating layer containing carbon powder, whose main ingredient is graphite as a conducting agent. The method of manufacturing provides a thin electrode plate that is suitable for use as a spirally-wound type of electrode plate. The resulting plates have excellent high-rate discharge characteristics and long cycle life. The electrode plates are manufactured in a high productivity process that uses neither pore-forming agents nor pore-forming processes.