Abstract: A power storage cell includes: an electrode body in which a sheet member is wound so as to surround a winding axis; and a case in which the electrode body is housed, in which: the sheet member includes an electrode sheet and a separator; the electrode sheet includes a current collector plate and an electrode composite material layer fabricated on the current collector plate; the electrode sheet includes a groove portion extending in a direction of the winding axis, in which the electrode composite material layer is not fabricated; a plurality of the groove portions is fabricated in a direction in which the electrode sheet extends; and an interval between the groove portions on a winding inner side is smaller than an interval between the groove portions on a winding outer side.

Abstract: An electrode for a battery comprises a base material and a negative electrode active material layer. A cross section of the negative electrode active material layer parallel to a thickness direction includes a first region and a second region. In the thickness direction, the first region is interposed between the second region and the base material. The first region includes a first active material and a first binder. The second region includes a second active material and a second binder. Either a set of relationships of “A2<A1” and “B2<B1” or a set of relationships of expressions “A2>A1” and “B2>B1” is satisfied. A1 represents an aspect ratio of the first active material. A2 represents an aspect ratio of the second active material. B1 represents an area fraction of the first binder in the first region. B2 represents an area fraction of the second binder in the second region.

Abstract: The bipolar battery module of the present disclosure has a structure in which a plurality of cells is stacked in a laminating direction of the bipolar electrodes. Each of the plurality of cells includes an internal space in which an electrolytic solution is accommodated between two positive-negative electrode foil adjacent to each other in the laminating direction. In a part of the outer peripheral part of each cell, a liquid injection opening for injecting an electrolytic solution into the internal space is formed by the sealing member. The liquid injection opening in at least a part of the cells has a shape widened to the adjacent cell side by disposing the peripheral edge part of at least one of the positive-negative electrode foil of the two positive-negative electrode foil so as to be offset to the adjacent cell side.

Abstract: A power storage cell according to the present disclosure includes a wound electrode body and a cell case. The wound electrode body includes a cathode and an anode. The cell case accommodates the wound electrode body. The cell case includes a case body and a lid. The case body opens in one direction. The lid closes the case body. The lid includes a cathode external terminal, an anode external terminal, and an insulating member. The cathode external terminal is directly joined to the case body. The anode external terminal is electrically connected to the anode. The insulating member electrically insulates the cathode external terminal and the anode external terminal. The cathode external terminal is electrically connected to the cathode via the case body.

Abstract: In an energy storage cell according to the present disclosure, a wound electrode assembly includes a first electrode and a second electrode. A first current collector member is connected to the first electrode. A second current collector member is connected to the second electrode. A lid includes a first external terminal and a second external terminal. The first external terminal is disposed so as to overlap the radial center of the wound electrode assembly as viewed in an axial direction. The second external terminal is fixed to a case body. The first current collector member is connected to the first external terminal. The second current collector member is disposed between the case body and the second external terminal. The second current collector member is joined to the second external terminal by being, together with the second external terminal, fixed to the case body.

Abstract: A method of manufacturing a power storage cell includes: forming a wound electrode assembly by winding a positive electrode, a negative electrode, and a separator; fixing a winding end portion, in a winding direction, of the wound electrode assembly, by a fixing member; housing, in a cell case, the wound electrode assembly having the winding end portion fixed by the fixing member; injecting an electrolyte solution in the cell case; and releasing fixing of the winding end portion by the fixing member, after the wound electrode assembly is housed in the cell case and the electrolyte solution is injected in the cell case.

Abstract: In a power storage cell according to the present disclosure, the first electrode of the wound electrode assembly includes a sheet-shaped current collector and an electrode composite material layer formed on the current collector. The current collector includes a coated portion on which the electrode composite material layer is coated and an uncoated portion on which the electrode composite material layer is not coated. The uncoated portion protrudes from the coated portion to one side in the axial direction of the wound electrode assembly. The case houses the wound electrode assembly, and includes a cylindrical wall portion and a bottom portion. The cylindrical wall portion is provided so as to cover the outer peripheral side of the wound electrode assembly. The bottom portion is disposed on one side in the axial direction, connected to one end of the cylindrical wall portion, and joined to the uncoated portion by welding.

Abstract: In a power storage cell, a current collector plate includes a central portion, an outer peripheral edge, a spoke, a first piece, and a second piece. The central portion is disposed to overlap with a center of the wound electrode body when viewed from an The outer peripheral edge is located on the outer peripheral side of the 5 axial direction. central portion. One of the outer peripheral edge and the central portion is connected to the case to electrically connect the current collector plate to the first external terminal. The spoke connects the central portion and the outer peripheral edge. The first piece extends from the central portion toward the outer peripheral edge and is connected to the first electrode. The second piece extends from the outer peripheral edge toward the center portion and is connected to the first electrode.

Abstract: In the energy storage cell according to the present disclosure, the first wound electrode assembly includes a first positive electrode and a first negative electrode. The second wound electrode assembly includes a second positive electrode and a second negative electrode. The second positive electrode is not in contact with the first positive electrode. The second negative electrode is not in contact with the first negative electrode. The second wound electrode assembly is formed by winding around the first wound electrode assembly on the outer peripheral side of the first wound electrode assembly. The positive electrode current collector member is electrically connected to both the first positive electrode and the second positive electrode. The negative electrode current collector member is electrically connected to both the first negative electrode and the second negative electrode.

Abstract: The power storage cell includes a cell case, a first two-dimensional identification code, and a second two-dimensional identification code. The cell case is configured to be capable of accommodating an electrode body. The first two-dimensional identification code is provided on an outer surface of the cell case. The first two-dimensional identification code is configured to be able to read the identification information. The second two-dimensional identification code is provided on the outer surface of the cell case spaced apart from the first two-dimensional identification code. The second two-dimensional identification code is configured to be able to read the same identification information as the first two-dimensional identification code. The second two-dimensional identification code is provided at a position where at least a part of the first two-dimensional identification code cannot be visually recognized when the second two-dimensional identification code is viewed from the front.

Abstract: A cathode sheet (first electrode sheet) of a power storage cell includes a long side (first long side) located at an end portion on a Z1 side (one side in an axial direction). An anode sheet (second electrode sheet) includes a long side (second long side) located at an end portion on the Z1 side. The cathode sheet includes a cathode current collector (first current collector) and a cathode composite material layer (first electrode material layer). A cathode uncoated portion of the cathode current collector is formed on the long side and includes a plurality of piece portions (first piece portions) disposed in an X direction (winding direction). An insulating portion (first insulating portion, insulating member) is formed on the long side of the anode sheet.

Abstract: The power storage cell includes a wound electrode body, a case, an internal gasket (a seal member), a positive electrode terminal (an external terminal), and a positive electrode connecting portion (a connecting member). The case includes a peripheral wall portion, a lower lid (first lid portion), and an upper lid (second lid portion). The lower lid has an exhaust valve for exhausting the gas in the case. A through hole (second through hole) is formed in the upper lid (second lid). The positive electrode connecting portion includes a columnar portion extending in the Z direction so as to penetrate the through hole of the upper lid and the through hole (first through hole) of the inner gasket. The inner gasket is disposed so as to cover the through hole from the inside of the case.

Abstract: The power storage module includes a plurality of electricity storage cells (cylindrical power storage cells), a column portion arranged so as to be surrounded by the plurality of electricity storage cells, and a case accommodating the plurality of electricity storage cells. The column portion extends along the Z direction. The length of the column portion in the Z direction (axial direction) is larger than the length of each of the plurality of power storage cells in the Z direction.

Abstract: An energy storage cell according to the present disclosure includes a wound electrode assembly and a cell case. The cell case includes an outer peripheral wall portion, a first end portion, a second end portion, and an inner peripheral wall portion. The first end portion has a first hole. The second end portion has a second hole. The inner peripheral wall portion extends from the first hole to the second hole. The inner peripheral wall portion is disposed inside the wound electrode assembly in a radial direction. A portion of the outer peripheral wall portion that is located next to the wound electrode assembly in the radial direction has a rectangular tubular outer shape. A portion of the inner peripheral wall portion that is located next to the wound electrode assembly in the radial direction has a rectangular tubular outer shape.

Abstract: An energy storage cell includes a wound electrode assembly including a positive electrode plate (first electrode), a negative electrode plate (second electrode), and a separator. The positive electrode plate includes a plurality of portions (metal pieces) provided at end portions in the Z direction (axial direction). A through hole (opening) is formed in each of the plurality of portions.

Abstract: A power storage cell includes a wound electrode assembly which includes a positive plate (a first electrode), a negative plate (a second electrode), and a separator. The positive plate includes a positive current collector (a current collector), a positive electrode mixture layer (an electrode material layer) with which a portion of the positive current collector is coated, a positive tab lead (a tab lead), and an adhesive (a cushioning). The positive tab lead is disposed on an uncoated portion that is not coated with the positive electrode mixture layer. The adhesive is disposed adjacent to the positive tab lead on the uncoated portion.

Abstract: A power storage cell includes a wound electrode assembly which includes: a positive plate (a first electrode); a negative plate (a second electrode); and a separator, and a securing member for securing the wound electrode assembly so that the wound electrode assembly is maintained in a wound state. The wound electrode assembly includes an end surface (a first end surface) on one side in Z direction (axial direction) in which a winding axis extends, and an end surface (a second end surface) on the other side in Z direction. The securing member is disposed on at least on the end surface.

Abstract: A power storage cell includes a first electrode sheet, a second electrode sheet and a separator, the first electrode sheet includes a first current collector and a first electrode composite material layer, the first current collector includes a first uncoated portion, the first uncoated portion includes a plurality of first metal pieces located at a first end portion and arranged in a winding direction of a sheet body, the first metal pieces extend toward a winding axis, and an at least one insulating member includes a first insulating member formed at an edge portion.

Abstract: The power storage cell includes a wound electrode body and a case that houses the wound electrode body. The wound electrode body includes an outer peripheral surface on which a bulging portion is formed. The case includes an inner peripheral surface facing the outer peripheral surface. On the inner peripheral surface, a groove portion (recessed portion) is provided at a position facing the bulging portion.

Abstract: A power storage cell includes an electrode body in which a sheet member is wound surrounding a winding axis, and a housing case in which the electrode body is housed. The electrode body includes a starting terminal portion in a winding direction, and an ending terminal portion located on an opposite side from the starting terminal portion. The sheet member includes an electrode sheet and a separator. The electrode sheet includes a current collector plate and an electrode composite material layer formed on the current collector plate. The electrode sheet includes a first portion located in one winding portion from the starting terminal portion, and a second portion located on the ending terminal portion side from the first portion. A thickness of the electrode composite material layer located in the first portion is smaller than a thickness of the electrode composite material layer located in the second portion.