Abstract: The herein disclosed bus bar 1 includes a first joint area that is joined to a terminal part of a first electric storage device, includes a second joint area that is joined to a terminal part of the second electric storage device, and includes a cross-linked area connecting the first joint area and the second joint area. Then, on at least one of the first joint area and the second joint area, a buffering part is provided that is configured to absorb a stress caused by a fluctuation of an interval between the first joint area and the second joint area. The bus bar having the above described configuration can mitigate the stress applied onto the joint part of the terminal part of the bus bar.

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: 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: 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 secondary battery includes a case body, a sealing member closing the case body, an electrode body housed in the case body and constituted of positive and negative electrode bodies stacked with separators interposed therebetween, and positive and negative collector terminals each including a base portion located in end portions of the sealing member and connected thereto via an insulating member, a base adjoining portion adjacent to the base portion, separated from or separably in contact with the insulating member, and a lead portion with a lead upper end portion connected to the base adjoining portion and a lead lower end portion bonded to the electrode body. The base adjoining portion or the lead upper end portion includes an easily-deformable portion that can be deformed without melting with respect to the base portion to allow displacement of the lead lower end portion in the long-side direction of the sealing member.

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: A first electrode tab group is disposed to be deviated from a center of an electrode assembly toward a first-side end portion of a first surface in a long-side direction of the first surface. A second-side end portion of the first surface is located opposite to the first-side end portion with respect to the center of the electrode assembly in the long-side direction and an injection hole is provided on the second-side end portion side in the first surface. The cover member includes a first portion and a pair of second portions. The first portion faces the injection hole in the first direction. The pair of second portions sandwich the electrode assembly in the short-side direction of the first surface.

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 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: 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: In a secondary battery, a first current collecting member has a first region extending along a first wall, a second region extending in a direction intersecting the first wall, and a first folded portion provided between the first region and the second region, the second current collecting member has a third region extending along the first wall, a fourth region extending in the direction intersecting the first wall, and a second folded portion provided between the third region and the fourth region, the first region and the third region are disposed to overlap with each other, the first region is located on the electrode assembly side with respect to the third region, a first electrode tab is connected to the first region, and the second region and the fourth region are joined to each other.

Abstract: A method of manufacturing a secondary battery includes: after producing a first electrode assembly and a second electrode assembly, electrically connecting a second electrode tab and a fourth electrode tab to a second current collector with the first electrode assembly being disposed on one side with respect to the second current collector and the second electrode assembly being disposed on the other side with respect to the second current collector; and after joining the second electrode tab and the fourth electrode tab, bending the second electrode tab and the fourth electrode tab such that the first electrode tab and the third electrode tab face each other so as to overlap the first electrode assembly and the second electrode assembly with each other.

Abstract: In the present secondary battery, a first spacer is disposed in a first opening of a case main body between a first sealing plate and an electrode assembly, the first spacer includes a first protrusion facing the first electrode tab, and the first electrode tab is curved and bent to be provided with a recess recessed at a position facing the first protrusion. With this configuration, an energy density of the secondary battery can be improved, thereby stably manufacturing the secondary battery.

Abstract: The present secondary battery includes: a first spacer disposed to face a first electrode tab; a second spacer disposed to face the second electrode tab; and an insulating sheet disposed to cover the electrode assembly, the first spacer, and the second spacer, wherein the insulating sheet and the first spacer are connected to each other, and the insulating sheet and the second spacer are connected to each other.

Abstract: In a method of manufacturing a secondary battery, joining a first current collecting member and a second current collecting member includes joining the first current collecting member and the second current collecting member by applying a high-energy ray to at least one of the first current collecting member and the second current collecting member from between a case main body and a first sealing plate.

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 first stack includes a plurality of first battery cells arranged in a first direction. A plate-like first conductive member electrically connects the first stack and a second stack. A plate-like second conductive member electrically connects a third stack and an electrical apparatus. A case includes a pair of side walls supporting the first stack, the second stack, and the third stack from both sides in the first direction. The electrical apparatus, the first stack, the second stack, and the third stack are arranged in this order in a second direction orthogonal to the first direction. The first conductive member and the second conductive member overlap each other in a third direction orthogonal to the first direction and the second direction.