An adhesive film for metal terminals is interposed between a metal terminal connected to an electrode of a power storage device element and a power storage device external member, and includes, a first polyolefin layer, a substrate, and a second polyolefin layer disposed on the metal terminal side. A sea-island structure is observed in a sectional image of the first polyolefin layer in a direction parallel to TD, the sectional image being obtained in the range of up to 30% of the thickness of the first polyolefin layer. In the sectional image, after the adhesive film for metal terminals is left to stand for 12 seconds in a heated and pressurized environment in which the temperature is 190° C. and the surface pressure is 0.016 MPa, and then left for one hour at 25° C., the of the total area of the island portions of the sea-island structure is 25.0% to 35.0%.

An adhesive film for metal terminals is interposed between a metal terminal connected to an electrode of a power storage device element and a power storage device external member, and includes, a first polyolefin layer, a substrate, and a second polyolefin layer disposed on the metal terminal side. A sea-island structure is observed in a sectional image of the first polyolefin layer in a direction parallel to TD, the sectional image being obtained in the range of up to 30% of the thickness of the first polyolefin layer. In the sectional image, after the adhesive film for metal terminals is left to stand for 12 seconds in a heated and pressurized environment in which the temperature is 190° C. and the surface pressure is 0.016 MPa, and then left for one hour at 25° C., the of the total area of the island portions of the sea-island structure is 25.0% to 35.0%.

A terminal structure to be adopted for a power storage device including an outer case that has an opening, includes: a sealing plate sealing the opening; a terminal member inserted into a terminal hole formed in the sealing plate and electrically connected to an electrode; and a first insulating member arranged between the sealing plate and the terminal member, and arranged on an outer surface side of the sealing plate facing an outer side of the power storage device. The terminal member has a first extended part extending further outward than an outer periphery of the terminal hole on the outer side of the power storage device. A first protruding part or a second recessed part provided to the first insulating member and a first recessed part or a second protruding part provided to the sealing plate or to the first extended part fit with each other.

A terminal structure to be adopted for a power storage device including an outer case that has an opening, includes: a sealing plate sealing the opening; a terminal member inserted into a terminal hole formed in the sealing plate and electrically connected to an electrode; and a first insulating member arranged between the sealing plate and the terminal member, and arranged on an outer surface side of the sealing plate facing an outer side of the power storage device. The terminal member has a first extended part extending further outward than an outer periphery of the terminal hole on the outer side of the power storage device. A first protruding part or a second recessed part provided to the first insulating member and a first recessed part or a second protruding part provided to the sealing plate or to the first extended part fit with each other.

An electricity storage device has an electricity storage element sealed in a package member of a laminate material including a thermal adhesive resin layer. The package member has a housing portion having a substantially rectangular opening and formed to have a predetermined depth; a flange portion protruding outward from the circumferential edge of the opening; and a lid portion covering the opening and thermally bonded to the flange portion. The electricity storage element has a pair of electrode terminals protruding respectively from opposite longer-side edges of the opening and held between the flange portion and the lid portion.

Disclosed is an electrochemical energy storage device, belonging to the technical field of electrochemical energy storage devices. The electrochemical energy storage device comprises: a cover plate (6), which comprises a lead-out column (61) and a fixation plate (62), wherein the lead-out column (61) is an electric conductor, the fixation plate (62) is an insulator, and the lead-out column (61) is fixed on the fixation plate (62) in a vertically penetrating manner; an outer housing (1), which is cylindrical, wherein an opening is provided at at least one end of the outer housing, and the fixation plate (62) is connected to the opening of the outer housing (1) in a sealed manner by means of a sealing ring (9); and a roll core (3), which is arranged at an inner cavity of the outer housing (1), wherein the roll core (3) is welded to a side face of the lead-out column (61) by means of an upper connection piece (4) to achieve electrically conductive connection, and connected in an electrically conductive manner to the other lead-out end of the outer housing (1) by means of a lower connection piece (2); and an upper roll edge (42) used for sheathing the roll core (3) is arranged at a periphery of the upper connection piece (4), and a periphery of the lead-out column (61) and the upper roll edge (42) of the upper connection piece (4) are fixed by means of side-face laser welding. The electrochemical energy storage device has the advantages that the internal resistance is small, the strength is high, the stability is good, and anti-vibration performance can be improved in the process of use.

Disclosed is an electrochemical energy storage device, belonging to the technical field of electrochemical energy storage devices. The electrochemical energy storage device comprises: a cover plate (6), which comprises a lead-out column (61) and a fixation plate (62), wherein the lead-out column (61) is an electric conductor, the fixation plate (62) is an insulator, and the lead-out column (61) is fixed on the fixation plate (62) in a vertically penetrating manner; an outer housing (1), which is cylindrical, wherein an opening is provided at at least one end of the outer housing, and the fixation plate (62) is connected to the opening of the outer housing (1) in a sealed manner by means of a sealing ring (9); and a roll core (3), which is arranged at an inner cavity of the outer housing (1), wherein the roll core (3) is welded to a side face of the lead-out column (61) by means of an upper connection piece (4) to achieve electrically conductive connection, and connected in an electrically conductive manner to the other lead-out end of the outer housing (1) by means of a lower connection piece (2); and an upper roll edge (42) used for sheathing the roll core (3) is arranged at a periphery of the upper connection piece (4), and a periphery of the lead-out column (61) and the upper roll edge (42) of the upper connection piece (4) are fixed by means of side-face laser welding. The electrochemical energy storage device has the advantages that the internal resistance is small, the strength is high, the stability is good, and anti-vibration performance can be improved in the process of use.

An adhesive film for a metal terminal being interposed between a metal terminal electrically connected to an electrode of a power storage device element, and a power storage device external member that seals the power storage device element. The adhesive film is configured from a laminate provided with: a first polyolefin layer disposed on the metal terminal side; a base material; and a second polyolefin layer disposed on the power storage device external member side. Under the following measurement conditions, the restoration rate measured when an indenter is pressed in a vertical direction with respect to a cross section in a thickness direction of the first polyolefin layer is 46.0% or greater. Restoration rate measurement conditions are a load of 10 mN, a load application speed of 1 mN/10 seconds, retention time of 10 seconds, a load releasing speed of 1 mN/10 seconds, and measurement temperature of 25° C.

Provided is a laminated power storage element including: an electrode member including a plurality of positive and negative electrode bodies each having a sheet shape and separators, the plurality of positive electrode bodies and the plurality of negative electrode bodies arranged so as to individually face each other, and the separators interposed between the individual electrode bodies; a plurality of positive electrode collectors connected to the plurality of positive electrode bodies; a plurality of negative electrode collectors connected to the plurality of negative electrode bodies; a positive electrode-side terminal to which the respective positive electrode collectors are connected; and a negative electrode-side terminal to which the respective negative electrode collectors are connected, wherein on at least one terminal of the positive electrode-side terminal and the negative electrode-side terminal, connection parts to which corresponding collectors are connected are arranged in a spatially distributed manner.

Provided is a laminated power storage element including: an electrode member including a plurality of positive and negative electrode bodies each having a sheet shape and separators, the plurality of positive electrode bodies and the plurality of negative electrode bodies arranged so as to individually face each other, and the separators interposed between the individual electrode bodies; a plurality of positive electrode collectors connected to the plurality of positive electrode bodies; a plurality of negative electrode collectors connected to the plurality of negative electrode bodies; a positive electrode-side terminal to which the respective positive electrode collectors are connected; and a negative electrode-side terminal to which the respective negative electrode collectors are connected, wherein on at least one terminal of the positive electrode-side terminal and the negative electrode-side terminal, connection parts to which corresponding collectors are connected are arranged in a spatially distributed manner.