Abstract: A cylindrical lithium ion battery in which an electrode group formed by winding a positive electrode and a negative electrode is housed in a battery case is disclosed. A sealing plate seals an opening of the battery case. An insulating plate having a plurality of openings is provided on a side of the electrode group closer to the sealing plate. The plurality of openings include a first hole with a largest opening area, and a plurality of second holes with opening areas smaller than the opening area of the first hole. An opening ratio of the first hole is 12% or more and 40% or less; a sum of opening ratios of the second holes is 0.3% or more and 10% or less; and a total opening ratio of all the openings is 20% or more and 50% or less.

Abstract: A sealed battery according to the present invention includes a bottomed cylindrical outer can having an opening, the opening and a sealing plate being crimp-sealed with an insulating gasket interposed therebetween. The sealing plate has a thin portion that serves as a starting point of deformation of the sealing plate when a battery internal pressure increases. When the battery internal pressure increases, the sealing plate is deformed so that a gap is formed between the insulating gasket and the sealing plate and gas in the outer can is vented to the outside of the outer can. The sealing plate may be formed of a single plate-shaped member.

Abstract: A sealed battery including a bottomed cylindrical outer can having an opening, the opening and a sealing body being crimp-sealed with an insulating gasket interposed therebetween, is disclosed. The sealing body includes a first plate-shaped member and a second plate-shaped member bonded to a surface of the first plate-shaped member, the surface facing the outside of the battery. At least the first plate-shaped member is crimp-sealed at an outer periphery thereof, and the crimp-sealed plate-shaped member has a thin portion on at least one surface thereof, the thin portion serving as a starting point of deformation of the sealing body when a battery internal pressure increases. When the battery internal pressure increases, the sealing body is deformed so that a gap is formed between the insulating gasket and the sealing body and gas in the outer can is vented to the outside of the outer can.

Abstract: An object of the present invention is to safely discharge gases to the outside of a battery even when the gases are generated in a sealed secondary battery. In the sealed secondary battery according to the present invention, an electrode group (4) formed by winding a positive electrode plate (1) and a negative electrode plate (2) with a separator (3) interposed therebetween or formed by stacking the positive electrode plate (1) and the negative electrode plate (2) one on top of another with the separator (3) interposed therebetween is housed in a battery case (5). The sealed secondary battery includes an insulating plate (8) and a sealing body (10). The insulating plate (8) is disposed on an end surface of the electrode group (4) on an opening side of the battery case (5). The sealing body (10) seals the opening of the battery case and includes a cap (14). The cap (14) and the insulating plate (8) respectively have a first opening (14a) and a second opening (8a).

Abstract: The battery is sealed by a sealing member including a safety valve for exhausting the gas generated in the battery to the outside of the battery when the pressure in the battery is increased. A part of the sealing member is formed of a member having a melting point lower than that of high-temperature gas generated in the abnormal time and having a ratio of an area of an opening of the battery case to an area of a gas exhaust hole is 3.0×10?5 or more and 9.1×10?3 or less.

Abstract: A sealed secondary battery comprises a bottomed cylindrical battery case having an opening, a sealing member sealing the opening of the battery case, and a spiral electrode assembly in which a positive electrode plate and a negative electrode plate are wound with a separator interposed therebetween, and an annular thin portion is formed in the bottom of the battery case, and the ratio of the area of a region surrounded by the annular thin portion to the area of the bottom portion of the battery case is equal to or more than 10%, and a volume energy density is equal to or more than 500 Wh/L.

Abstract: A cylindrical lithium ion battery in which an electrode group formed by winding a positive electrode and a negative electrode is housed in a battery case is disclosed. A sealing plate seals an opening of the battery case. An insulating plate having a plurality of openings is provided on a side of the electrode group closer to the sealing plate. The plurality of openings include a first hole with a largest opening area, and a plurality of second holes with opening areas smaller than the opening area of the first hole. An opening ratio of the first hole is 12% or more and 40% or less; a sum of opening ratios of the second holes is 0.3% or more and 10% or less; and a total opening ratio of all the openings is 20% or more and 50% or less.

Abstract: The present disclosure is directed to a packaging construction for columnar batteries. The packaging construction includes an accommodation case including a bottom plate, and side plates located on outer edges of the bottom plate; a first tray having first recesses into which one end portions of the batteries are fitted, placed immediately above the bottom plate, and fixed to the accommodation case; and a second tray having second recesses into which the other end portions of the batteries are fitted, and placed above the first tray. The batteries are held so as to be fitted to the first and second trays and such that each adjacent pair of the batteries are apart from each other. A portion of a bottom of each first recess facing a corner portion of the one end portion of a corresponding one of the fitted batteries protrudes outward to be apart from the corner portion.

Abstract: The present disclosure is directed to a packaging construction for columnar batteries. The packaging construction includes an accommodation case including a bottom plate, and side plates located on outer edges of the bottom plate; a first tray having first recesses into which one end portions of the batteries are fitted, placed immediately above the bottom plate, and fixed to the accommodation case; and a second tray having second recesses into which the other end portions of the batteries are fitted, and placed above the first tray. The batteries are held so as to be fitted to the first and second trays and such that each adjacent pair of the batteries are apart from each other. A portion of a bottom of each first recess facing a corner portion of the one end portion of a corresponding one of the fitted batteries protrudes outward to be apart from the corner portion.

Abstract: In a sealed secondary battery, an electrode group 1 formed by winding or stacking a positive electrode plate and a negative electrode plate with a porous insulator interposed therebetween is housed in a metal case 4. The metal case 4 has an opening sealed by a sealing plate 6 serving as an electrode terminal. One of the positive electrode plate or the negative electrode plate is connected to the sealing plate 6 through a lead. An upper insulating plate as a stack of a first insulating plate 2 and a second insulating plate 7 having a softening temperature higher than that of the first insulating plate 2 is placed above the electrode group 1. An outer periphery of the upper insulating plate is engaged with an engagement part 9 formed in a side surface of the metal case 4.

Abstract: A sealed battery including: an electrode group 4 formed by winding or stacking a positive electrode plate 1 and a negative electrode plate 2 with a separator 3 interposed between the positive electrode plate 1 and the negative electrode plate 2, and housed in a battery case 5, an opening of the battery case 5 being sealed with a sealing plate, wherein a lead 11 extending from one of the electrode plates in the electrode group 4 is laser-welded to the sealing plate 10, and a melting width of an end section 13 of a welded portion 9 between the lead 11 and the sealing plate 10 is smaller than a melting width of a center section of the welded portion 9.

Abstract: An electrode group 4 formed by stacking or winding a positive electrode plate 1 and a negative electrode plate 2 with a separator 3 interposed therebetween, is housed in a battery case 5. An opening of the battery case 5 is sealed with a sealing plate 10. A lead 11 extending from one of the positive and negative electrode plates in the electrode group 4 is laser-welded to the sealing plate 10 by application of a laser beam 12 having a spot diameter smaller than a thickness of the lead 11.

Abstract: A sealed battery includes electrode group 4 formed by winding or stacking a positive electrode plate 1 and a negative electrode plate 2 with a separator 3 interposed between the positive electrode plate 1 and the negative electrode plate 2, the electrode group being housed in a battery case 5, and an opening of the battery case 5 being sealed with a sealing plate 10, wherein a lead 11 extending from one of the electrode plates in the electrode group 4 is laser welded to the sealing plate 10, and a welding portion 14 between the lead 11 and the sealing plate 10 has a linear shape straddling at least an end portion of the lead 11.

Abstract: A gasket that provides sealing between an assembled sealing member and the opening of a battery case includes a high-strength layer inside thereof. The high-strength layer is formed by using a material having a higher strength than that of a gasket body. Examples of such a material include high-strength resins such as polyamide, polyimide and polyphenylene sulfide, and a ceramic. On the other hand, the gasket body is made of a material having a high level of sealing properties. With this configuration, even when extraneous metallic matter or the like is present in a sealed portion, it is possible to prevent both insulating properties and sealing properties of the sealed portion from being impaired.

Abstract: An electrode group 4 formed by stacking or winding a positive electrode plate 1 and a negative electrode plate 2 with a separator 3 interposed therebetween, is housed in a battery case 5. An opening of the battery case 5 is sealed with a sealing plate 10. A lead 11 extending from one of the positive and negative electrode plates in the electrode group 4 is laser-welded to the sealing plate 10 by application of a laser beam 12 having a spot diameter smaller than a thickness of the lead 11.

Abstract: A center pin is inserted in a hollow cavity of an electrode group of a lithium ion secondary battery. The center pin includes a center portion, a perimeter portion and an end portion. The center portion extends in the radial direction of the hollow cavity. The perimeter portion extends along an inner wall surface of the hollow cavity from an end of the center portion in the radial direction of the hollow cavity. The end portion extends from an end of the perimeter portion in the circumferential direction toward the inside of the hollow cavity to be away from the inner wall surface of the hollow cavity but separated from the center portion.

Abstract: Superimposing strip layers including a positive electrode strip and a negative electrode strip, which are put into layers together with a separator strip which is put between the electrode strips, are spirally wound around an outer circumference of a bobbin having an end cross section similar in shape to a center hole of a spiral electrode to form a substantially circular center hole in the spiral electrode while extracting the bobbin.