A rechargeable battery is produced by welding a metal foil to a contact element to make electrical contact with an electrode of the rechargeable battery. An edge region of the metal foil is brought into contact with a first surface of the contact element and welded to the contact element by applying a laser beam to a second surface of the contact element. The second surface being averted from (opposite to) the first surface of the contact element. The metal foil and further planar constituents of the rechargeable battery are wound to provide the rechargeable battery with an at least essentially cylindrical design. The contact element-is oriented at right angles to the metal foil.

A battery includes a negative electrode body wound to be flat. The negative electrode body has a plurality of negative electrode main bodies arranged in a line in a negative electrode connection direction in a developed state, and at least one negative electrode connection portion connecting a pair of negative electrode main bodies adjacent in the developed state among the plurality of negative electrode main bodies. The at least one negative electrode connection portion is folded back such that the plurality of negative electrode main bodies overlap each other. A dimension of each of the plurality of negative electrode main bodies in the negative electrode connection direction decreases with separation from an outer end side negative electrode main body. A dimension of the at least one negative electrode connection portions in the negative electrode connection direction increases with separation from an inner end side negative electrode connection portion.

An aluminum base composite material contains an aluminum polycrystal body being a polycrystal body of a plurality of aluminum base material phases partitioned by a grain boundary, a carbon nanotube part being formed of a carbon nanotube or an aggregate thereof and being dispersed in at least one aluminum base material phase, and an alumina part being formed of alumina and being dispersed in at least one aluminum base material phase. The carbon nanotube preferably has a sphere-equivalent diameter from 10 nm to 300 nm, and the number of the carbon nanotube part that is present in a cross-sectional area of 200 μm.sup.2 of the aluminum base composite material is preferably one or more.

An aluminum base composite material contains an aluminum polycrystal body being a polycrystal body of a plurality of aluminum base material phases partitioned by a grain boundary, a carbon nanotube part being formed of a carbon nanotube or an aggregate thereof and being dispersed in at least one aluminum base material phase, and an alumina part being formed of alumina and being dispersed in at least one aluminum base material phase. The carbon nanotube preferably has a sphere-equivalent diameter from 10 nm to 300 nm, and the number of the carbon nanotube part that is present in a cross-sectional area of 200 μm.sup.2 of the aluminum base composite material is preferably one or more.

Embodiments of the present disclosure provide a battery, which includes a plurality of energy storage units; and a connecting portion that connects the plurality of energy storage units together in parallel, where the connecting portion is made of a flexible material. The embodiments of the present disclosure further provides a display panel, which includes the above battery and a flexible display module, where the battery is provides on a back side of the flexible display module, the battery is electrically connected with the flexible display module for providing power to the flexible display module.

Embodiments of the present disclosure provide a battery, which includes a plurality of energy storage units; and a connecting portion that connects the plurality of energy storage units together in parallel, where the connecting portion is made of a flexible material. The embodiments of the present disclosure further provides a display panel, which includes the above battery and a flexible display module, where the battery is provides on a back side of the flexible display module, the battery is electrically connected with the flexible display module for providing power to the flexible display module.

Provided are a battery module, a battery pack and a vehicle including the same. The battery module includes a battery cell stack in which a plurality of battery cells are stacked; a bus bar to which electrode leads respectively provided in the plurality of battery cells are coupled; and a cover in which the battery cell stack is accommodated, wherein the bus bar is provided such that at least a part of the bus bar is in contact with upper surfaces of the electrode leads.

A secondary battery has a simplified structure of a terminal part to reduce the number of parts, and terminal parts can be directly connected without requiring a separate part (for example, a bus bar) for mutual electrical connection between a battery and another battery. A secondary battery comprises: an electrode assembly, a case for accommodating the electrode assembly; a cap plate coupled to the case; and a terminal part that is electrically connected to the electrode assembly and is extended to penetrate through the cap plate, wherein the terminal part comprises a first area having a first thickness that is electrically connected to the electrode assembly from the inside of the case, and a second area having a second thickness that is thicker than the first thickness and is electrically connected to the first area from the outer side of the case.

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.