Abstract: A determination method for determining a processing state includes detecting, using an optical sensor, at least one of heat radiation light, visible light, and reflected light generated at a welded portion formed at a surface of a workpiece by emission of a laser beam on the workpiece, obtaining a signal indicating a change in at least one of heat radiation light, visible light, and reflected light in a time section corresponding to a welding time of each workpiece, calculating a feature quantity including a gradient of a straight line approximating a signal waveform of the signal in a predetermined section in the time section, determining, as the processing state, a shift including farness and closeness of a focal position of the laser beam in an emission direction of the laser beam by inputting the calculated feature quantity to a determination model that determines the processing state.

Abstract: An estimation model generation device is a device that generates an estimation model for estimating a processing state of laser processing. First thermal radiation, first visible light, first reflected light, and first laser light are observed from a workpiece during laser processing by a first device, and the device includes an information acquiring section that acquires first waveform data including a first waveform and a second waveform for at least two of the first thermal radiation, the first visible light, the first reflected light, and the first laser light, an estimation model generating section that performs machine learning by using teacher data having the first waveform data as an explanatory variable and the processing state as a target variable in association with each other to generate a first estimation model for estimating the processing state by the first device, and a storage that stores the first estimation model.

Abstract: A determination method for determining a processing state includes detecting, using an optical sensor, at least one of heat radiation light, visible light, and reflected light generated at a welded portion formed at a surface of a workpiece by emission of a laser beam on the workpiece, obtaining, from the optical sensor, a signal indicating a change in one of heat radiation, visible light, and reflected light in a time section corresponding to a welding time of each workpiece, determining, as the processing state, the position and number of molten shape abnormality in a welded region having a molten length and a molten width by inputting a feature quantity to a determination model that determines the processing state, the feature quantity including signal intensity of the signal, the molten shape abnormality occurring when a foreign substance exists at an overlapping surface of the workpiece, and outputting a determination result.

Abstract: A laser processing method for scanning over a first member in a first direction while irradiating the first member with a laser beam emitted from an oscillator, and joining the first member and a second member adjacent to the first member by a molten portion, the laser processing method including the steps of: in each of a first measurement region and a second measurement region different from the first measurement region, measuring an intensity of a welding light including any one of a heat radiation light radiated from at least one of the first member and the second member by irradiation with the laser beam, a plasma light, and a reflected light; and evaluating a processing state based on the intensity of the welding light measured in each of the first measurement region and the second measurement region, in which the first measurement region and the second measurement region are aligned in a second direction intersecting the first direction.

Abstract: A cylindrical battery includes an electrode unit configured as a roll of a first electrode plate and a second electrode plate with a separator in between. The first electrode plate is an electrode plate to which one end of a first electrode tab and one end of a second electrode tab are connected, and the second electrode plate has the opposite polarity from the first electrode plate. Additionally, a case houses the electrode unit and a sealing member seals an opening rim of the case. The first electrode tab and the second electrode tab are disposed to project out from the first electrode plate at opposite ends of a winding axis of the first electrode plate. The first electrode tab contacts at a bottom portion of the case and the second electrode tab is welded at the opening rim side opposite the bottom portion of the case.

Abstract: A light source measurement apparatus includes an objective lens that collects light emitted from a light source having a plurality of light emission points, a first reflection attenuation filter, a second reflection attenuation filter, a condensing lens, a space filter, and a movable stage, in which the first reflection attenuation filter and the second reflection attenuation filter are disposed such that polarization directions are orthogonal to each other, in which the space filter has an opening through which light emitted from a measurement target light emission point among the plurality of light emission points is transmitted, and in which the opening has a shape in which a dimension of the measurement target light emission point in a fast direction is larger than a dimension of the measurement target light emission point in a slow direction.

Abstract: A laser processing system includes a laser oscillator that forms a fusion zone in a workpiece by irradiating a fusion-scheduled region of a processing target surface of the workpiece with a laser beam, a photometer that measures intensity of light from the fusion zone of the workpiece, and a jig disposed on the processing target surface of the workpiece not to overlap the fusion-scheduled region in order to press the workpiece. The jig has a reflection surface inclined in a manner that the reflection surface is further away from the fusion-scheduled region as the reflection surface is further away from the processing target surface in a normal direction of the processing target surface of the workpiece.

Abstract: An evaluation method for evaluating laser machining in which irradiation region of a laser beam is moved relative to object to perform machining of object, includes a measurement step and an evaluation step. In the measurement step, a change in an intensity of light according to a movement of measurement region is measured by moving measurement region for measuring the intensity of light, relative to object. In the evaluation step, an evaluation of the laser machining is performed based on the change in the intensity of light according to the movement of measurement region. In the measurement step, measurement region is moved relative to object so that movement path of measurement region has a plurality of intersections with movement path of irradiation region.

Abstract: Disclosed is a battery including: a battery can including a cylinder portion including an opening edge portion at one end portion thereof and a bottom portion closing the other end portion of the cylinder portion; an electrode body housed in the cylinder portion; and a sealing member fixed to the cylinder portion to seal an opening of an opening edge portion. The sealing member includes a lid portion covering the opening of the opening edge portion. A first engagement portion is formed in the end portion of the cylinder portion on the opening edge portion side, and a second engagement portion is formed in an end portion of the lid portion on an outer circumferential side. A first surface of the first engagement portion and a second surface of the second engagement portion are bonded, with the first surface and the second surface overlapping each other.

Abstract: Provided is a laser processing method including overlapping a plurality of plate-shaped members that include a first plate-shaped member disposed on one end side of an overlapping direction and a second plate-shaped member disposed on the other end side of the overlapping direction; branching a laser beam into a first branched laser beam and a second branched laser beam; irradiating the first plate-shaped member with the first branched laser beam and the second branched laser beam in a state where the first branched laser beam and the second branched laser beam are emitted in parallel; forming line-shaped melting portions on the first plate-shaped member by moving the branched laser beams in a direction intersecting a direction in which the branched laser beams are aligned; and joining overlapped plate-shaped members in a state where the melting portion formed by using the first branched laser beam and the melting portion formed by using the second branched laser beam are connected to each other in the second

Abstract: The present disclosure includes a laser welding method in which a joint surface between a plurality of workpiece members is welded by radiating laser beam LB, and a locus of laser beam LB is controlled so as to perform wobbling scanning Sw by a combination of scanning motion Sa moving along first direction x parallel to the joint surface and swing motion Sb including first swing component Bx along first direction x and second swing component By along second direction y perpendicular to first direction x, the method including a defect determination step of determining occurrence of a welding defect; and an output control step of increasing or decreasing an output of laser beam LB when laser beam LB is radiated again toward the welding defect in a case where the welding defect occurs.

Abstract: A laser processing device which irradiates a workpiece while scanning focused laser light and forms molten region on a surface of workpiece includes first optical sensor which has a function of detecting light generated from molten region during irradiation with the laser light, the detecting is performed for first measurement region on the surface of workpiece as a detection target, and second optical sensor which has a function of detecting light generated from molten region during irradiation with the laser light, the detecting is performed for second measurement region narrower than first measurement region on the surface of workpiece as a detection target.

Abstract: A sealed cell includes a bottomed cylindrical outer casing can. The outer casing can is formed by nickel-plated iron, and a lead connected to one of a positive electrode and a negative electrode, and the outer casing can, are welded by a welding part formed from the outside surface of the outer casing can toward the lead. The welding part is formed by molten traces and has a first layer and a second layer having a higher nickel concentration than the first layer. The first layer is formed from the lead through to the inside of the outer casing can, the second layer is formed so as to adjoin the first layer on the outside surface side of the outer casing can, and the whole of the first layer is covered with the second layer when the welding part is viewed from the outside of the outer casing can.

Abstract: A laser welding quality inspection method of a welded portion between a joining object and a joined object, when the joining object and the joined object are welded by being irradiated with a laser beam, the method includes: acquiring first data indicating a signal intensity of thermal radiation light radiated from the welded portion during the welding; acquiring second data indicating a signal intensity of plasma light radiated from the welded portion during the welding; and determining whether or not the welded portion includes an abnormality based on a comparison between the signal intensity of the thermal radiation light and the signal intensity of the plasma light which are acquired.

Abstract: A sealed cell includes a bottomed cylindrical outer casing can. The outer casing can is formed by nickel-plated iron, and a lead connected to one of a positive electrode and a negative electrode, and the outer casing can, are welded by a welding part formed from the outside surface of the outer casing can toward the lead. The welding part is formed by molten traces and has a first layer and a second layer having a higher nickel concentration than the first layer. The first layer is formed from the lead through to the inside of the outer casing can, the second layer is formed so as to adjoin the first layer on the outside surface side of the outer casing can, and the whole of the first layer is covered with the second layer when the welding part is viewed from the outside of the outer casing can.

Abstract: A light source measurement apparatus includes an objective lens that collects light emitted from a light source having a plurality of light emission points, a first reflection attenuation filter, a second reflection attenuation filter, a condensing lens, a space filter, and a movable stage, in which the first reflection attenuation filter and the second reflection attenuation filter are disposed such that polarization directions are orthogonal to each other, in which the space filter has an opening through which light emitted from a measurement target light emission point among the plurality of light emission points is transmitted, and in which the opening has a shape in which a dimension of the measurement target light emission point in a fast direction is larger than a dimension of the measurement target light emission point in a slow direction.

Abstract: A cylindrical battery having improved strength against rotational torque includes: an electrode unit configured as a roll of a first electrode plate and a second electrode plate with a separator in between, the first electrode plate being an electrode plate to which one end of a first electrode tab and one end of a second electrode tab are connected, the second electrode plate having opposite polarity from the first electrode plate; a case housing the electrode unit; and a sealing member sealing an opening rim of the case. The first electrode tab and the second electrode tab are disposed to project out from the first electrode plate at opposite ends of a winding axis of the first electrode late. The first electrode tab is in contact with a bottom portion of the case by being welded thereto. The second electrode tab is welded at the opening rim side opposite the bottom portion of the case.

Abstract: When a linear welding trace is formed by welding a battery case and an electrode tab, an output of the laser increases to a first output during a first period after laser irradiation start to melt the battery case until the electrode tab is melted with the first output, the first output is maintained during a second period to melt the electrode tab and the battery case, the output of the laser decreases from the first output to a second output for melting only the battery case, and the second output is maintained until formation of the welding trace is completed or the laser output is decreased from the second output by an amount that is less than the decrease amount when the laser output decreased from the first output to the second output.

Abstract: A battery includes a power generation component including a positive electrode, a negative electrode, and an electrolyte, and a battery case accommodating the power generation component. The negative electrode includes a first lead (17) having a single layer structure whose main component is nickel, and a second lead (18) having a layered structure including a Ni layer (18a) whose main component is nickel and a Cu layer (18b) whose main component is copper. The battery includes a layered portion (35) formed of the leads that are superposed such that the Ni layer (18a) of the second lead (18) faces the first lead (17). Part of the layered portion (35) is welded to an inner surface of the battery case with the first lead (17) at the layered portion (35) being disposed on a battery case side.

Abstract: When a linear welding trace is formed by welding a battery case and an electrode tab, an output of the laser increases to a first output during a first period after laser irradiation start to melt the battery case until the electrode tab is melted with the first output, the first output is maintained during a second period to melt the electrode tab and the battery case, the output of the laser decreases from the first output to a second output for melting only the battery case, and the second output is maintained until formation of the welding trace is completed or the laser output is decreased from the second output by an amount that is less than the decrease amount when the laser output decreased from the first output to the second output.