A battery cell includes an electrode assembly including a first tab and a second tab located on two ends of the electrode assembly, respectively, in a first direction. The battery cell further includes a first electrode terminal and a second electrode terminal located on two sides of the electrode assembly, respectively, in the first direction, a first adapter configured to couple the first tab and the first electrode terminal, and a second adapter configured to couple the second tab and the second electrode terminal. The first adapter and the second adapter each comprise at least two non-bending portions and at least one bending portion each connecting two adjacent ones of the at least two non-bending portions. A number of the at least two non-bending portions of the second adapter is greater than a number of the at least two non-bending portions of the first adapter.

A battery cell includes an electrode assembly including a first tab and a second tab located on two ends of the electrode assembly, respectively, in a first direction. The battery cell further includes a first electrode terminal and a second electrode terminal located on two sides of the electrode assembly, respectively, in the first direction, a first adapter configured to couple the first tab and the first electrode terminal, and a second adapter configured to couple the second tab and the second electrode terminal. The first adapter and the second adapter each comprise at least two non-bending portions and at least one bending portion each connecting two adjacent ones of the at least two non-bending portions. A number of the at least two non-bending portions of the second adapter is greater than a number of the at least two non-bending portions of the first adapter.

A pouch type secondary battery according to an embodiment of the present disclosure is a pouch type secondary battery in which a cell assembly, including an electrode assembly in which a positive electrode and a negative electrode are stacked with a separator interposed therebetween, at least one electrode tab protruding from the electrode assembly, and an electrode lead connected to the electrode tab, is housed in a pouch case, wherein the secondary battery comprises a lead film positioned between the pouch case and the electrode lead, and wherein the lead film comprises a first sealing part in a region far from the electrode assembly and a second sealing part in a region close to the electrode assembly, and a thickness of the second sealing part is larger than a thickness of the first sealing part.

A pouch type secondary battery according to an embodiment of the present disclosure is a pouch type secondary battery in which a cell assembly, including an electrode assembly in which a positive electrode and a negative electrode are stacked with a separator interposed therebetween, at least one electrode tab protruding from the electrode assembly, and an electrode lead connected to the electrode tab, is housed in a pouch case, wherein the secondary battery comprises a lead film positioned between the pouch case and the electrode lead, and wherein the lead film comprises a first sealing part in a region far from the electrode assembly and a second sealing part in a region close to the electrode assembly, and a thickness of the second sealing part is larger than a thickness of the first sealing part.

A first electrode current collector is joined to a multilayer of a positive electrode core in a part including no positive electrode active material layer of the first electrode core, by ultrasonic welding in a joint area. The joint area, at which the multilayers of the first electrode core where the first electrode cores are stacked is joined to the first electrode current collector by ultrasonic welding, includes a plurality of core recesses. A core projection is formed between each adjacent pair of the plurality of core recesses of the multilayer of the first electrode core with the first electrode core flexed in a convex shape. A gap in an arc shape is formed between the adjacent pair of the layers of the first electrode core forming the core projection. The gap has a length decreasing from an apex to a bottom of the core projection.

A lithium-sulfur battery includes a casing, a top lid circumferentially welded to the casing, a negative contact surface positioned opposite the top lid, a positive terminal disposed within the casing, welded to the top lid, and configured as a mandrel, a glass insulator circumferentially wound around the mandrel, and a jelly roll including at least an anode and a cathode wound around the mandrel. The jelly roll may also include a top surface not in contact with the top lid, a bottom surface partially in contact with the negative contact surface, and partially in contact with a plurality of non-hollow carbonaceous spherical particles disposed between the bottom surface of the jelly roll and the negative contact surface. At least some of the non-hollow carbonaceous spherical particles may provide one or more electrically-conductive pathways between the bottom surface and the negative contact surface.

Certain aspects relate to a battery pack for electric vertical take-off and landing aircraft. Exemplary battery pack includes a first pouch cell, a second pouch cell, at least a sensor, where the at least a sensor is configured to sense battery pack data and transmit the battery pack data to a data storage system, and a vent configured to vent the ejecta from the first pouch cell. In some embodiments, battery pack may be configured to power at least a propulsor component.

Certain aspects relate to a battery pack for electric vertical take-off and landing aircraft. Exemplary battery pack includes a first pouch cell, a second pouch cell, at least a sensor, where the at least a sensor is configured to sense battery pack data and transmit the battery pack data to a data storage system, and a vent configured to vent the ejecta from the first pouch cell. In some embodiments, battery pack may be configured to power at least a propulsor component.

A rechargeable button cell having a height-to-diameter ratio less than one, including two metal housing halves separated from one another by an electrically insulating seal or film seal forming a housing having a plane bottom region and a plane top region parallel thereto is disclosed. The housing contains an electrode separator assembly comprising a positive electrode and a negative electrode inside the housing, the electrode separator assembly being provided in the form of a winding, end sides of which face in a direction of the plane bottom region and the plane top region such that layers of the electrode separator assembly are oriented essentially orthogonally to the plane bottom region and plane top region.

An electronic device includes an electrode assembly. The electrode assembly is configured to be a wound structure and is provided with a first bending section. The electrode assembly comprises a first electrode plate, a second electrode plate, and a conductive member. The first electrode plate includes a first current collector and a first active material layer, and along a winding direction, the first current collector includes a first part and a second part that are connected in sequence. Both surfaces of the first part are arranged with the first active material layer, an inner surface of the second part is provided with the first active material layer, and the second part includes a bending part located at an outermost layer of the first bending section. The conductive member connects the outer surfaces of the first part and the second part, and/or covers on the outer surface of the bending part.