Abstract: A method for producing a battery resulting from the joining with a plurality of weld nuggets therebetween of a foil layered part, at which foil exposed portions exposing an aluminum foil overlap, and a positive terminal member made of aluminum, includes: a formation step for forming at the foil layered part a foil welded part at which are formed, by welding aluminum foils together by means of ultrasonic welding, a first high-position part at at least a section of a surface to be joined, and a plurality of first low-position parts distributed at scattered points within the first high-position part; and a resistance-welding step for contacting the first high-position part to the positive terminal member, generating weld nuggets at the first low-position part by flowing an electric current, and resistance-welding the foil welded part and the positive terminal member with the weld nuggets therebetween.

Abstract: A method for producing a battery resulting from the joining with a plurality of weld nuggets therebetween of a foil layered part, at which foil exposed portions exposing an aluminum foil overlap, and a positive terminal member made of aluminum, includes: a formation step for forming at the foil layered part a foil welded part at which are formed, by welding aluminum foils together by means of ultrasonic welding, a first high-position part at at least a section of a surface to be joined, and a plurality of first low-position parts distributed at scattered points within the first high-position part; and a resistance-welding step for contacting the first high-position part to the positive terminal member, generating weld nuggets at the first low-position part by flowing an electric current, and resistance-welding the foil welded part and the positive terminal member with the weld nuggets therebetween.

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 positive electrode 2 includes a positive electrode current collector lead 70 connected to a core exposed part 78 formed at a longitudinal center of a current collector core 72. A negative electrode 3 includes a double-coated part 14 including an active material layer 13 and a porous protective film 28 formed on each surface of a current collector core 12, a core exposed part 18, and a single-coated part 17 which is located between the double-coated part 14 and the core exposed part 18, and includes the active material layer 13 and the porous protective film 28 formed only on one of the surfaces of the current collector core 12. A plurality of grooves 10 are formed in each surface of the double-coated part 14, while the grooves 10 are not formed in the single-coated part 17. A negative electrode current collector lead 20 is connected to the core exposed part 18. The negative electrode 3 is wound in such a manner that the core exposed part 18 constitutes a last wound end.

Abstract: A negative electrode 3 for a nonaqueous battery includes a double-coated part 14 including a negative electrode active material layer 13 and a porous protective film 28 formed on each surface of a current collector core 12, a core exposed part 18, and a single-coated part 17 which is located between the double-coated part 14 and the core exposed part 18, and includes the negative electrode active material layer 13 and the porous protective film 28 formed only on one of the surfaces of the current collector core 12. A plurality of grooves 10 are formed in each surface of the double-coated part 14, while the grooves 10 are not formed in the single-coated part 17. The grooves 10 are formed in a surface of the porous protective film 28 to extend in a surface of the active material layer 13. A negative electrode current collector lead 20 is connected to the core exposed part 18. The negative electrode 3 is wound in such a manner that the core exposed part 18 constitutes a last wound end.

Abstract: A positive electrode 2 includes a double-coated part 14 including an active material layer 13 and a porous protective film 28 formed on each surface of a current collector core 12, a core exposed part 18, and a single-coated part 17 which is located between the double-coated part 14 and the core exposed part 18, and includes the active material layer 13 and the porous protective film 28 formed only on one of the surfaces of the current collector core 12. A plurality of grooves 10 are formed in each surface of the double-coated part 14, while the grooves 10 are not formed in the single-coated part 17. The grooves 10 are formed in a surface of the porous protective film 28 to extend in a surface of the active material layer 13. A positive electrode current collector lead 20 is connected to the core exposed part 18.

Abstract: An electrode group for a nonaqueous battery includes a positive electrode (2) and a negative electrode (3) wound with a porous insulator (4) interposed therebetween. The positive electrode (2) includes a double-coated part (74), and a core exposed part (78). The core exposed part (78) is located at a longitudinal center of the positive electrode (2), and a current collector lead (70) is connected to the core exposed part (78). The negative electrode (3) includes a double-coated part (14), a core exposed part (18), and a single-coated part (17). A plurality of grooves (10) are formed in each surface of the double-coated part (14) to be inclined relative to a longitudinal direction of the negative electrode (3), while the grooves (10) are not formed in the single-coated part (17). In the electrode group for the nonaqueous battery, the negative electrode (3) is wound in such a manner that the core exposed part (18) constitutes a last wound end.

Abstract: A positive electrode 2 includes a positive electrode current collector lead 70 connected to a core exposed part 78 formed at a longitudinal center of a current collector core 72. A negative electrode 3 includes a double-coated part 14 including an active material layer 13 and a porous protective film 28 formed on each surface of a current collector core 12, a core exposed part 18, and a single-coated part 17 which is located between the double-coated part 14 and the core exposed part 18, and includes the active material layer 13 and the porous protective film 28 formed only on one of the surfaces of the current collector core 12. A plurality of grooves 10 are formed in each surface of the double-coated part 14, while the grooves 10 are not formed in the single-coated part 17. A negative electrode current collector lead 20 is connected to the core exposed part 18. The negative electrode 3 is wound in such a manner that the core exposed part 18 constitutes a last wound end.

Abstract: A negative electrode for a nonaqueous battery includes a double-coated part (14) including a negative electrode active material layer (13) formed on each surface of a current collector core (12), a core exposed part (18) which is located at an end of the current collector core (12), and does not include the negative electrode active material layer (13), and a single-coated part (17) which is located between the double-coated part (14) and the core exposed part (18), and includes the negative electrode active material layer (13) formed only on one of the surfaces of the current collector core (12). A plurality of grooves (10) are formed in each surface of the double-coated part (14) to be inclined relative to a longitudinal direction of the negative electrode (3), while the grooves (10) are not formed in the single-coated part (17). A negative electrode current collector lead (20) is connected to the core exposed part (18).

Abstract: A positive electrode for a nonaqueous battery includes a double-coated part (14) including a positive electrode active material layer (13) formed on each surface of a current collector core (12), a core exposed part (18) which is located at an end of the current collector core (12), and does not include the positive electrode active material layer (13), and a single-coated part (17) which is located between the double-coated part (14) and the core exposed part (18), and includes the positive electrode active material layer (13) formed only on one of the surfaces of the current collector core (12). A plurality of grooves (10) are formed in each surface of the double-coated part (14) to be inclined relative to a longitudinal direction of the positive electrode (2), while the grooves are not formed in the single-coated part (17). A positive electrode current collector lead (20) is connected to the core exposed part (18).

Abstract: An electrode plate includes a both-surface coated part 14 in which an electrode active material layer 13 is provided on both surfaces of a current collector core material 12, a core material exposed part 18 in which the negative electrode active material layer 13 is not provided, and a one-surface coated part 17 in which the negative electrode active material layer 13 is provided on only one surface of the current collector core material 12. A plurality of grooves 10 are formed in both surfaces of the both-surface coated part 14 and the grooves 10 are not formed in the one-surface coated part 17.

Abstract: A secondary battery includes an electrode plate group (1) in which a positive electrode plate (2) and a negative electrode plate (3) are wound or stacked with a separator (4) interposed therebetween and a battery case (7) in which the electrode plate group (1) and an electrolyte are contained. At least one of the positive electrode plate (2) and the negative electrode plate (3) includes a porous protective film (28) formed on a surface of an active material layer. In a surface of the at least one of the electrode plates on which the porous protective film (28) is provided, a plurality of grooves (10) are formed, and the grooves (10) are also formed in the surface of the active material so that each of the grooves (10) extends from the surface of the porous protective film (28) to the surface of the active material layer.

Abstract: A secondary battery includes an electrode plate group (1) in which a positive electrode plate (2) and a negative electrode plate (3) are wound or stacked with a separator (4) interposed therebetween and a battery case (7) in which the electrode plate group (1) and an electrolyte are contained. At least one of the positive electrode plate (2) and the negative electrode plate (3) includes a porous protective film (28) formed on a surface of an active material layer. In a surface of the at least one of the electrode plates on which the porous protective film (28) is provided, a plurality of grooves (10) are formed, and the grooves (10) are also formed in the surface of the active material so that each of the grooves (10) extends from the surface of the porous protective film (28) to the surface of the active material layer.

Abstract: In an electrode plate 3 including a both-surface coated part 14 in which an active material layer 13 and a porous protective film 28 are formed, a core material exposed part 18 which is an end part of the current collector core material 12 and in which the active material layer 13 and the porous protective film 28 are not formed, and a one-surface coated part 17 which is provided between the both-surface coated part 14 and the core material exposed part 18 and in which the active material layer 13 and the porous protective film 28 are formed, a plurality of grooves 10 are formed in both surfaces of the both-surface coated part 14 and are not formed in the one-surface coated part 17. The grooves 10 are formed so that each of the grooves extends from the porous protective film 28 to the active material layer 13.

Abstract: In an electrode plate 3 including a both-surface coated part 14 in which an active material layer 13 and a porous protective film 28 are formed, a core material exposed part 18 which is an end part of the current collector core material 12 and in which the active material layer 13 and the porous protective film 28 are not formed, and a one-surface coated part 17 which is provided between the both-surface coated part 14 and the core material exposed part 18 and in which the active material layer 13 and the porous protective film 28 are formed, a plurality of grooves 10 are formed in both surfaces of the both-surface coated part 14 and are not formed in the one-surface coated part 17. The grooves 10 are formed so that each of the grooves extends from the porous protective film 28 to the active material layer 13.

Abstract: An electrode plate includes a both-surface coated part 14 in which an electrode active material layer 13 is provided on both surfaces of a current collector core material 12, a core material exposed part 18 in which the negative electrode active material layer 13 is not provided, and a one-surface coated part 17 in which the negative electrode active material layer 13 is provided on only one surface of the current collector core material 12. A plurality of grooves 10 are formed in both surfaces of the both-surface coated part 14 and the grooves 10 are not formed in the one-surface coated part 17.

Abstract: A battery having a collecting structure that can reduce internal resistance of the battery and a structure that allows easy manufacturing of the battery by the following processes is provided. An enlarged portion is formed near an opening end of a battery case and a supporting ledge is provided on the inner surface of the lower end of the enlarged portion. A collector of one polarity is bonded to an electrode plate group. A connection lead is bonded to the collector at one end and is bonded to a lower surface of a sealing member at the other end. An insulation gasket is mounted to a peripheral edge portion of the sealing member from a side opposite to the collector. The peripheral edge portion of the sealing member is supported by the supporting ledge with the insulation gasket interposed therebetween.

Abstract: An electrode core material has a substrate and at least one porous material layer diffusion-bonded to the substrate. The substrate is made of a metal foil processed into a three-dimensional structure which is substantially deformed from a major plane of the metal foil, preferably having bulge portions which protrude from at least one side of the metal foil, the bulge portions preferably having a curved, strip-shaped form between laterally spaced slits in the metal foil. The porous material layer is made of metal fine particles diffusion-bonded to each other, and the porous material layer has a three-dimensional structure which is substantially uniform in thickness and porosity. Methods are provided for producing the electrode core material by diffusion bonding the porous material layer to the substrate either before or after deforming the metal foil. The electrode core material may be used for the positive and/or negative electrode of an alkaline storage battery.

Abstract: An alkaline storage battery comprising: a positive electrode plate; a negative electrode plate; separators interposed between the positive electrode plate and the negative electrode plate; and an alkaline electrolyte, wherein a first edge of the positive electrode plate and a first edge of the negative electrode plate serve as current collecting portions, at least a second edge of at least the positive electrode plate is covered with polyethylene resin on an end face and peripheral sides thereof, the second edge being positioned opposite to the first edge, and the polyethylene resin film formed at the second edge of the positive electrode plate adheres to the separators positioned on both sides of the positive electrode plate.

Abstract: A battery electrode plate (19) is produced via an active material impregnation step for impregnating an entire porous core substrate shaped like a thin plate (1) with an active material (3), a pressing step for performing press working on the core substrate to form a plurality of rail shaped protrusions (8), an active material removal step for removing the active material to form core substrate exposed sections (13) by applying ultrasonic vibrations to the rail shaped protrusions, a flattening step for compressing the core substrate exposed sections down to an identical level with the other sections, and a cutting step for cutting predetermined sections including the core substrate exposed sections.