An energy storage device includes: a core; and a wound body including, layered and wound around the core: a positive electrode, a negative electrode, and two separators, one of which is interposed between the positive electrode and the negative electrode and each having a first surface and a second surface. The first surface has thermal bonding properties superior to thermal bonding properties of the second surface, and at least one of the two separators is bonded to the core via the first surface thereof.

A method and apparatus for the production of wound elements. The method comprising: providing a plurality of first electrical web elements; disposing at least one of the first electrical web elements upon a conveying element, wherein a first or second face of the disposed first electrical web elements is disposed in a face to face relationship with the conveying element; providing a plurality of second electrical web elements; disposing at least one of the second electrical web elements upon the conveying element at a predetermined spacing from the disposed first electrical web elements and in a face to face relationship with the conveying element, wherein the predetermined spacing is at least as long as the length of the first electrical web element; and disposing an electrically insulating separator web element in a face to face relationship with the disposed electrical web elements.

A method and apparatus for the production of wound elements. The method comprising: providing a plurality of first electrical web elements; disposing at least one of the first electrical web elements upon a conveying element, wherein a first or second face of the disposed first electrical web elements is disposed in a face to face relationship with the conveying element; providing a plurality of second electrical web elements; disposing at least one of the second electrical web elements upon the conveying element at a predetermined spacing from the disposed first electrical web elements and in a face to face relationship with the conveying element, wherein the predetermined spacing is at least as long as the length of the first electrical web element; and disposing an electrically insulating separator web element in a face to face relationship with the disposed electrical web elements.

A stretchable battery and the method of manufacturing the same. The stretchable battery can be manufactured by using a printing process. The construction of the stretchable battery can comprise a first layer of an elastomer film, a first current collector layer, a layer of cathode, a separating layer, a layer of anode, and a second current collector layer. Metal traces can be used to couple with the first and/or the second current collector layers.

An electric storage battery and method of manufacture thereof characterized by a feedthrough pin which is internally directly physically and electrically connected to an inner end of a positive electrode substrate. A C-shaped mandrel extends around the pin and substrate end enabling the pin/mandrel to be used during the manufacturing process as an arbor to facilitate winding layers of a spiral jellyroll electrode assembly. The pin additionally extends from the battery case and in the final product constitutes one of the battery terminals with the battery case comprising the other terminal. Active material is removed from both sides of the outer end of the negative electrode in the jellyroll to allow room for adhesive tape to secure the jellyroll. The electrolyte is injected through the open end of the case after the endcap is welded to the negative electrode but before sealing the endcap to the case. The electrolyte is preferably injected through the C-shaped mandrel to facilitate and speed filling.

An electric storage battery and method of manufacture thereof characterized by a feedthrough pin which is internally directly physically and electrically connected to an inner end of a positive electrode substrate. A C-shaped mandrel extends around the pin and substrate end enabling the pin/mandrel to be used during the manufacturing process as an arbor to facilitate winding layers of a spiral jellyroll electrode assembly. The pin additionally extends from the battery case and in the final product constitutes one of the battery terminals with the battery case comprising the other terminal. Active material is removed from both sides of the outer end of the negative electrode in the jellyroll to allow room for adhesive tape to secure the jellyroll. The electrolyte is injected through the open end of the case after the endcap is welded to the negative electrode but before sealing the endcap to the case. The electrolyte is preferably injected through the C-shaped mandrel to facilitate and speed filling.

In a winding-type battery, the first electrode and the second electrode are wound via the separator to form an electrode group having first and second end surfaces. The first electrode includes a first current collector sheet, and a first active material layer formed on a surface of the first current collector sheet. A first current collecting lead is connected to the first electrode. The second electrode includes a second current collector sheet, and a second active material layer formed on a surface of the second current collector sheet. A second current collecting lead is connected to the second electrode. At an end of the first electrode that is disposed on the first end surface and/or an end of the first electrode that is disposed on the second end surface, at least a winding termination portion located on the outermost periphery of the electrode group has a notch.

In a winding-type battery, the first electrode and the second electrode are wound via the separator to form an electrode group having first and second end surfaces. The first electrode includes a first current collector sheet, and a first active material layer formed on a surface of the first current collector sheet. A first current collecting lead is connected to the first electrode. The second electrode includes a second current collector sheet, and a second active material layer formed on a surface of the second current collector sheet. A second current collecting lead is connected to the second electrode. At an end of the first electrode that is disposed on the first end surface and/or an end of the first electrode that is disposed on the second end surface, at least a winding termination portion located on the outermost periphery of the electrode group has a notch.

A sheet for folding batteries includes a sheet that has one surface and another surface, and has a plurality of intended fold lines parallel to each other set on the sheet, at least one electrolyte part that is placed between a pair of the intended fold lines on the sheet, and a plurality of electrode parts that is placed, on the sheet, next to the electrolyte part with the intended fold line interposed therebetween. The electrolyte part includes a through hole provided between the one surface and the other surface of the sheet, and an electrolyte layer that is formed on the one surface and the other surface of the sheet so as to face each other across the through hole and is integrated via the through hole.

An electrode assembly includes a first electrode plate including a first electrode current collector and a first electrode active material layer thereon, a second electrode plate including a second electrode current collector and a second electrode active material layer thereon, a separator between the first electrode plate and the second electrode plate, a first electrode tab coupled to the first electrode current collector, and a second electrode tab coupled to the second electrode current collector, wherein a region of the first electrode current collector including the first electrode tab faces a wound first electrode plate, wherein a region of the second electrode current collector including the second electrode tab faces a wound second electrode plate, and wherein the second electrode active material layer is only on one surface of the second electrode current collector in a region preceding a first winding turn of the second electrode plate.