Batteries having vents are disclosed. An example battery includes a housing, including: a first terminal and a second terminal. The first terminal includes a cover. The cover includes at least one line of weakness therein. The line of weakness is structured to form an opening when a threshold pressure is satisfied within the housing to enable gas to vent from the housing through the opening. A filter is positioned within the housing and adjacent the cover. The filter has an aperture structured to enable the gas to vent from the housing and to deter solid material housed within the housing from exiting the opening when the threshold pressure is satisfied.

A surface-treated steel sheet, including: a steel sheet; and a nickel-cobalt-iron diffusion layer formed as an outermost surface layer on the steel sheet. When a content of Ni, a content of Co and a content of Fe of the nickel-cobalt-iron diffusion layer are determined based on a Ni intensity, a Co intensity and a Fe intensity each sequentially measured in the depth direction from the surface side of the nickel-cobalt-iron diffusion layer by a radio frequency glow discharge optical emission spectrometry, a content of Co at a specific depth position D, In.sub.Co_D, is 5% by mass or higher and a content of Fe at the specific depth position D, In.sub.Fe_D, is 11% by mass or higher, the specific depth position D being a position where the Ni intensity is 0.5% of the maximum value of the Ni intensity. Also disclosed is a method for manufacturing the surface-treated steel sheet.

An electrochemical cell comprises a can comprising a cylindrical side wall extending from a closed end wall. The closed end wall comprises a protrusion. The protrusion has a protrusion cavity therein. The electrochemical cell further comprises a separator defining an inner cavity and separating the inner cavity from an outer cavity. The outer cavity is defined by the can and the separator. The electrochemical cell further comprises a first electrode material disposed in the outer cavity and the protrusion cavity; and a second electrode material disposed in the inner cavity.

A battery includes a battery case including a housing having side walls defining a first open end and a second open end, the battery case including a separate top cover to cover the first open end of the housing and a separate bottom cover to cover the second open end of the housing; a first electrode located within the case; a second electrode located within the case; a first terminal coupled to the first electrode and exposed outside the case; and a second terminal coupled to the second electrode and exposed outside the case.

Batteries having vents are disclosed. An example battery includes a housing, including: a first terminal and a second terminal. The first terminal includes a cover. The cover includes at least one line of weakness therein. The line of weakness is structured to form an opening when a threshold pressure is satisfied within the housing to enable gas to vent from the housing through the opening. A filter is positioned within the housing and adjacent the cover. The filter has an aperture structured to enable the gas to vent from the housing and to deter solid material housed within the housing from exiting the opening when the threshold pressure is satisfied.

Provided are an all-solid state secondary battery having a battery element member having a collector, a solid electrolyte layer, and a positive electrode active material layer, an axial core having the battery element member disposed on a side surface outer circumference, and a battery exterior body that is configured to store the battery element member and the axial core, in which a reinforcement coating body is provided on the side surface outer circumference of the battery exterior body, and, in a discharged state, a compressive stress of 0.5 MPa or more at 25 C. is provided between the axial core and the battery exterior body and between the battery exterior body and the battery element member; and a manufacturing method therefor.

A battery cell includes a battery element, a front lid member covering one end portion of the battery element in a predetermined direction, and an exterior film at least partially wrapped around the predetermined direction of the battery element. The exterior film is rounded along the battery element in at least one corner of the battery element around the predetermined direction.

An electrochemical cell comprises a can comprising a cylindrical side wall extending from a closed end wall. The closed end wall comprises a protrusion. The protrusion has a protrusion cavity therein. The electrochemical cell further comprises a separator defining an inner cavity and separating the inner cavity from an outer cavity. The outer cavity is defined by the can and the separator. The electrochemical cell further comprises a first electrode material disposed in the outer cavity and the protrusion cavity; and a second electrode material disposed in the inner cavity.

A lithium cell includes a housing including a housing cup, a cover plate and an annular insulating sealing element, wherein the housing has an end-side cup base, a circumferential housing casing and a circular opening opposite the housing base and formed by an opening edge. The cover plate has a circumferential edge and closes the circular opening. The cell includes a pin-shaped negative electrode current collector electrically connected to the cover plate. The sealing element is fitted onto the edge of the cover plate. The sealing element insulates the cover plate and the housing cup from one another. The cell can be produced by the components being brought together in two preassembled units combined to form the cell.

A sealed battery includes a metal battery case having a bottom portion and an opening; a metal sealing member that seals the opening of the battery case; and a power generation element housed in the battery case. A side wall of the battery case includes a rising portion from the bottom portion, and a bent portion in an open end side. The open end extends toward the inside of the battery case. A thickness of the side wall of the battery case is 0.2 mm or less.