Abstract: An internal terminal is disposed inside a battery case and so as to be spaced apart from the battery case. An external terminal is disposed outside the battery case and spaced apart from the battery case, and the external terminal is connected to the internal terminal through a terminal mounting hole. An electrically insulating resin is disposed so as to fill a gap between the battery case and the internal terminal and a gap between the battery case and the external terminal, and the electrically insulating resin is joined to the battery case, to the internal terminal, and to the external terminal. At least one of the internal terminal and the external terminal includes a protruding portion protruding into the terminal mounting hole, and the internal terminal and the external terminal are joined to each other at a tip of the protruding portion.

Abstract: A method for producing an electrode sheet includes heating before pressing to heat the electrode sheet to soften or melt binder particles contained in an electrode mixture layer and roll-pressing the electrode sheet heated in the heating before pressing by use of first and second rolls. In the roll-pressing, the temperature of an outer peripheral surface of a first roll with which an outer surface of the electrode mixture layer of the electrode sheet contacts is set lower than the temperature of an outer peripheral surface of the second roll, and the electrode sheet is roll-pressed so that an adhesive strength of binder particles in the electrode mixture layer to the first roll is reduced lower than an adhesive strength of the binder particles to a current collecting foil.

Abstract: The electrodes disclosed herein, a low-density region having a relatively low electrode density and a high-density region having a relatively high electrode density are repeated on a surface of the electrode active material layer in a predetermined pattern at a constant pitch. The electrode active material layer is evenly divided into three layers of an upper layer, an intermediate layer, and a lower layer in a thickness direction from the surface of the active material layer to the electrode current collector, and when the electrode densities (g/cm3) of the upper layer, the intermediate layer, and the lower layer of the low-density region are respectively dL1, dL2, and dL3 and the electrode densities (g/cm3) of the upper layer, the intermediate layer, and the lower layer of the high-density region are respectively dH1, dH2, and dH3, a relation of dH3/dL3<dH1/dL1 is satisfied.

Abstract: A nonaqueous electrolyte secondary battery includes an electrode assembly and an electrolyte solution. The electrode assembly includes a laminated assembly. The laminated assembly includes a positive electrode plate, a negative electrode plate, and a separator. The separator separates the positive electrode plate and the negative electrode plate from each other. The separator includes a porous resin layer. The porous resin layer includes a polyolefin-based material. The negative electrode plate includes a negative electrode active material layer. The negative electrode active material layer includes negative electrode active material particles. The negative electrode active material layer is in direct contact with the porous resin layer. The negative electrode active material layer has a puncture resistance of more than or equal to 0.60 N/mm.

Abstract: An electrode having both high energy density and ion diffusivity includes an electrode active material layer on either a positive-or negative-electrode current collector, in which the electrode active material layer has a concave/convex shape on its surface in a predetermined pattern at a constant pitch. In a cross-sectional SEM image of the electrode active material layer, linear cracks are unevenly distributed in a concave portion compared to in a convex portion.

Abstract: The present disclosure provides a technique for constructing an electrode terminal with superior conductivity. An electrode terminal disclosed herein includes: a first member which has a connecting portion that is exposed to outside of the case; and a second member which is a plate-shaped conductive member arranged outside of the case. In addition, the connecting portion penetrates the case and the second member and forms a cap portion having a flat plate shape outside of the second member. Furthermore, a plurality of recessed portions are formed on an upper surface of the cap portion, and a bonding portion due to an intermetallic bond is formed on a boundary, which is between the first member and the second member, below each of the recessed portions. Accordingly, a contact resistance between the first member and the second member can be reduced and conductivity of the electrode terminal can be improved.

Abstract: A method for identifying a foil position in a power storage device includes: analyzing the power storage device by X-ray CT analysis to obtain an X-ray absorbed amount at each position; acquiring an on-path X-ray absorbed amount at each on-path position on a specific imaginary line passing through an electrode sheet; and identifying a foil position of an electrode foil through which the specific imaginary line passes, based on the on-path X-ray absorbed amount. The foil position identifying includes fitting to determine an approximate curve that changes to fit a change in the on-path X-ray absorbed amount in a fitting region and generates a single peak in the fitting region, and estimating a foil position of a single electrode foil from the on-path position corresponding to the single peak of the determined approximate curve.

Abstract: The manufacturing method herein disclosed includes a forming step of stacking a positive electrode sheet including a positive electrode active material layer on a positive electrode collector, a negative electrode sheet including a negative electrode active material layer on a negative electrode collector, and a separator sheet, thereby forming an electrode body; a constructing step of accommodating the electrode body in a battery case, and pouring an electrolyte into the battery case, thereby constructing a battery assembly; and a charging step of charging the battery assembly. At least any one of the positive electrode active material layer and the negative electrode active material layer has an undulating shape in a stacking direction, and a pit depth of the undulation is 10 ?m or more.

Abstract: An inspecting step includes a first period after a cooling step ends and a second period after the first period ends. Variations in a voltage drop value per unit time in a nonaqueous electrolyte rechargeable battery are smaller in the second period than in the first period. The cooling step cools the battery in a state where the electrode body is directly or indirectly pressurized and restrained in a thickness direction with a smaller pressure than that in the inspecting step or in a state where the electrode body is not restrained. The voltage value of the battery is measured when a specified time has passed after the voltage value of the battery was measured in the second period. The battery is determined as being normal when the voltage drop value per unit time based on the measured voltage value is less than or equal to a threshold value.

Abstract: An apparatus for manufacturing an electrode body includes a coater and an attraction magnet. The coater applies a mixture paste including an electrode active material to a substrate that is configured to be a current collector. The attraction magnet is opposed to an applied layer of the mixture paste formed on the substrate so that when the mixture paste contains a metal object, the attraction magnet attracts the metal object so as to change a shape of a surface of the applied layer.

Abstract: An inspection device of a film-type battery is provided which can detect a poorly sealed site of a heat seal part. The present disclosure provides an inspection device of a film-type battery including an electrode body, and a film exterior body for accommodating the electrode body in the inside thereof, and having a heat seal part at the periphery thereof. The inspection device includes a temperature measuring device for measuring the temperature distribution of the heat seal part, and a first determination part for controlling the temperature measuring device in a prescribed time after forming the heat seal part at the film exterior body, and determining the presence or absence of a poorly sealed site based on the temperature distribution measured.

Abstract: A power storage device includes: a power storage module including a plurality of stacked power storage cells; and a case having an inner space to accommodate the power storage module. The case includes a main body provided with an opening on an electrode terminal side of the plurality of power storage cells, a cover provided over the opening, and a tapered portion that narrows a width of the inner space in a direction from the opening toward a lower side of the main body.

Abstract: Provided is a lid body including: a terminal member being mainly made up of a first metal; a sealing plate mainly made up of a second metal; and a sealing material. The sealing plate has a mounting hole for attaching the terminal member. The terminal member is inserted into the mounting hole and is attached to the sealing plate in a state where the sealing material is joined to a peripheral edge portion of the mounting hole. With as ?S a coefficient of linear expansion at 25° C. of the sealing material, ?1 as a coefficient of linear expansion at 25° C. of the first metal and ?2 as a coefficient of linear expansion at 25° C. of the second metal, ?L??S??H is satisfied, where ?H is the higher value and ?L is the lower value from among the ?1 and ?2.

Abstract: A secondary battery disclosed herein includes: an electrode body; a battery case; a terminal extracted from a terminal extracting hole to outside of the battery case; and an external conductive member joined to the terminal. The external conductive member has a through-hole into which a part of the terminal is inserted, and a joining portion between the external conductive member and the terminal is formed at a peripheral edge of the through-hole. The external conductive member has an approximately annular thin portion provided around the joining portion, and the thin portion is configured to melt when a current of 1000 A or more flows through the secondary battery.

Abstract: The present disclosure provides a current collector of a secondary battery in which the current inside the battery is easily blocked at the time of inside short circuit, and in which the capacity retention rate and the decreasing rate of the electric resistance are outstanding. The current collector herein disclosed includes a laminate structure in which a resin layer and a metal layers formed on the both surfaces of the resin layer are laminated. The surface of the metal layer includes a rough surface part provided with a plurality of protruding parts and a plurality of recessed parts. On the rough surface part, a resin coat layer is formed, and at least one part of the protruding part among the plurality of protruding parts includes an exposed part that is exposed from the resin coat layer.

Abstract: A nonaqueous electrolyte secondary battery includes a positive electrode. The positive electrode includes a positive electrode active material layer. The positive electrode active material layer includes a first layer and a second layer. The first layer includes a first particle group. The second layer includes a mixture of a second particle group and a third particle group. The first particle group consists of a plurality of first positive electrode active material particles. The second particle group consists of a plurality of second positive electrode active material particles. The third particle group consists of a plurality of third positive electrode active material particles. Each of the first positive electrode active material particles and the third positive electrode active material particles independently includes 1 to 10 single-particles. Each of the second positive electrode active material particles includes secondary particles obtained by aggregation of 50 or more primary particles.

Abstract: A power storage module includes: a stack in which a plurality of power storage cells are stacked in a stacking direction; a resin plate having a bottom surface portion and placed on the stack of the plurality of power storage cells; a flexible printed circuit board placed on the bottom surface portion of the resin plate and having an electric circuit electrically connected to the plurality of power storage cells; a connector for the electric circuit, the connector being fixed to the flexible printed circuit board; and a substrate that supports the flexible printed circuit board and the connector, the substrate being fixed to the resin plate with the substrate being positioned in an extending direction of the bottom surface portion of the resin plate.

Abstract: The positive electrode active material layer is placed on a surface of the positive electrode substrate. The positive electrode active material layer includes a first layer and a second layer. The first layer is interposed between the positive electrode substrate and the second layer. The positive electrode active material layer includes a positive electrode active material, carbon black, and fibrous carbon. A mass fraction of the carbon black in the first layer is higher than a mass fraction of the carbon black in the second layer. A mass fraction of the fibrous carbon in the second layer is higher than a mass fraction of the fibrous carbon in the first layer.

Abstract: A power storage module includes: a stack in which a plurality of power storage cells are stacked in a stacking direction; a resin plate placed on the stack of the plurality of power storage cells; a flexible printed circuit board placed on the resin plate and having an electric circuit electrically connected to the plurality of power storage cells; and a cover member provided on the resin plate so as to cover the flexible printed circuit board. The resin plate includes a projection that extends through the flexible printed circuit board. The cover member includes a tubular protrusion that protrudes toward the flexible printed circuit board on the resin plate. The projection is accommodated in an inner periphery of the tubular protrusion. The tubular protrusion is in abutment with the flexible printed circuit board at a position to avoid the electric circuit.

Abstract: In a secondary batter, dead spaces between a wound electrode body and the inner peripheral surfaces of a rectangular battery case are made small. The secondary battery includes a wound electrode body in which a positive electrode sheet, a negative electrode sheet, and a separator interposed between the positive electrode sheet and the negative electrode sheet are superimposed and wound around a winding axis, and a rectangular battery case that houses the wound electrode body. The wound electrode body has a first flat surface, a second flat surface, a third flat surface, and a fourth flat surface positioned on the outer peripheral surfaces around the winding axis. The first flat surface and the second flat surface face each other with the winding axis interposed therebetween. The third flat surface and the fourth flat surface face each other with the winding axis interposed therebetween.