A technology for improving molding properties while minimizing curling after molding in a battery packaging material comprising a laminate that is provided with a barrier layer, a heat-sealable resin layer positioned on one surface side of the barrier layer, and a polyester film positioned on the other surface side of the barrier layer. This battery packaging material is configured from at least a laminate provided with a barrier layer, a heat-sealable resin layer positioned on one surface side of the barrier layer, and a polyester film positioned on the other surface side of the barrier layer. The birefringence of the polyester film is in the range of 0.016-0.056.

A technology for improving molding properties while minimizing curling after molding in a battery packaging material comprising a laminate that is provided with a barrier layer, a heat-sealable resin layer positioned on one surface side of the barrier layer, and a polyester film positioned on the other surface side of the barrier layer. This battery packaging material is configured from at least a laminate provided with a barrier layer, a heat-sealable resin layer positioned on one surface side of the barrier layer, and a polyester film positioned on the other surface side of the barrier layer. The birefringence of the polyester film is in the range of 0.016-0.056.

In order to create an electrochemical cell, comprising a housing, an electrochemical element arranged in an interior of the housing, and at least one cell terminal that comprises a terminal feed-through, which extends through a through-opening of the housing, which electrochemical cell is of simple construction and requires a low production expenditure but still reliably limits the short circuit current that arises in the case of a non-regular operating state, it is proposed that the electrochemical cell comprises an electrically conductive sealing element, which seals the through-opening of the housing and electrically conductively connects the cell terminal to the housing.

A sealing member is one used for a cylindrical lithium-ion battery. The sealing member is interposed between a bottom-closed cylindrical case and a cap, is made of perfluoropolymer, and has dimensions that meet the following relational expressions: when an axial distance from a cap upper surface to a leading end portion in a case is defined as HC, an axial distance from the cap upper surface to a leading end portion in the sealing member is defined as HG, a thickness of the sealing member is defined as TG, a value of TG divided by HG is defined as X (=TG/HG), and a value of HG divided by HC is defined as Y (=HG/HC),

X>0.800TG−0.324  (1)

Y<−0.778TG+1.670  (2)

Y>0.594X.sup.2−1.176X+0.913  (3).

A rechargeable battery includes: an electrode assembly including a first electrode, a second electrode, and a separator between the first electrode and the second electrode; a case configured to be connected to the first electrode and accommodate the electrode assembly, and including an opening to expose the electrode assembly; a cap plate configured to be coupled to the case to cover an outer area of the opening, and including a through-hole to expose a central area of the opening; a terminal plate configured to cover the through-hole and to be connected to the second electrode; and a thermal-fusion layer configured to be arranged between the cap plate and the terminal plate and to insulation-bond the cap plate and the terminal plate, and the thermal-fusion layer includes a plurality of layers including a thermoplastic resin layer.

The aim of the invention is to provide an electrochemical cell that can be produced as simply as possible and has a long service life. This is achieved in that the electrochemical cell comprises a first contact element that connects a first cell terminal to a first connection conductor and that is fixed to a cover element of the electrochemical cell by means of a first potting element in a first connection region, said first potting element being made of a first polymer material that comprises or is made of a first resin material, and/or the electrochemical cell comprises a second contact element that connects a second cell terminal to a second connection conductor and that is fixed to the cover element by means of a second potting element in a second connection region, said second potting element being made of a second polymer material that comprises or is made of a second resin material.

The aim of the invention is to provide an electrochemical cell that can be produced as simply as possible and has a long service life. This is achieved in that the electrochemical cell comprises a first contact element that connects a first cell terminal to a first connection conductor and that is fixed to a cover element of the electrochemical cell by means of a first potting element in a first connection region, said first potting element being made of a first polymer material that comprises or is made of a first resin material, and/or the electrochemical cell comprises a second contact element that connects a second cell terminal to a second connection conductor and that is fixed to the cover element by means of a second potting element in a second connection region, said second potting element being made of a second polymer material that comprises or is made of a second resin material.

A protrusion is formed to protrude from a separator to a side opposite to a plurality of battery cells along a second direction. A restraint member includes: a binding bar extending in a first direction; and an abutment member located on the plurality of battery cells side with respect to the binding bar, the abutment member being in abutment with the separator at a first position and a second position to form an air flow path, the first position and the second position being separated from each other along a third direction. The first position is located on a side close to an upper surface of a housing with respect to the second position. The protrusion is disposed only at the second position, and is provided to interfere with the abutment member at the second position so as to compress and deform the abutment member.

A protrusion is formed to protrude from a separator to a side opposite to a plurality of battery cells along a second direction. A restraint member includes: a binding bar extending in a first direction; and an abutment member located on the plurality of battery cells side with respect to the binding bar, the abutment member being in abutment with the separator at a first position and a second position to form an air flow path, the first position and the second position being separated from each other along a third direction. The first position is located on a side close to an upper surface of a housing with respect to the second position. The protrusion is disposed only at the second position, and is provided to interfere with the abutment member at the second position so as to compress and deform the abutment member.

The present disclosure provides batteries that have a reduced risk or no risk of gastrointestinal damage in a conductive aqueous environment, such as when accidentally swallowed. The batteries of the present disclosure advantageously stop producing significant current flow shortly after contact with a conductive aqueous medium, including the conductive aqueous medium of a wet tissue environment such as that found in the GI tract. The present disclosure further provides multi-layered laminate materials useful for manufacturing such batteries and methods for making the batteries. The batteries are, in some embodiments, 3 V or 1.5 V coin or button cell-type batteries.