Abstract: An electrochemical device has a positive electrode, a negative electrode, a negative-electrode terminal, separators, and electrolytic solution, where the positive electrode, negative electrode, and separators are stacked and wound together. The negative-electrode terminal is made of metal, and has a joining part which is a part joined to the principal face of the negative-electrode collector. A protective tape is made of insulating material and attached to the negative electrode to cover the joining part. The negative electrode has a first width along the direction parallel with the axis of winding. The positive electrode has a second width, which is smaller than the first width, along the direction parallel with the axis of winding. The length of the protective tape along the direction parallel with the axis of winding is equal to or greater than the second width.

Abstract: An electrochemical device includes a positive electrode, a negative electrode, and separators which are stacked and wound together, and electrolytic solution. A negative-electrode terminal is provided which is made of metal, and has a joining part which is a part joined to the principal face of the negative-electrode collector. The negative electrode has a first width, the positive electrode has a second width, which is smaller than the first width, and the separators have a third width, which is greater than the first width, along the direction parallel with the center axis of winding. The length of the joining part along the direction parallel with the center axis of winding is equal to or greater than the second width, but equal to or smaller than the third width.

Abstract: An electrochemical device is constituted by a positive electrode, a negative electrode, and separators that are wound in such a way that the first principal face of the negative electrode and third principal face of the positive electrode are on the inner side of winding, while the second principal face of the negative electrode and fourth principal face of the positive electrode are on the outer side of winding, with the separators separating the positive electrode and negative electrode; wherein the second principal face has a first region opposed to the positive electrode via the separator and a second region on the outermost side of winding and not opposed to the positive electrode, the second region includes a first uncoated region where no negative electrode active material layer is formed, and a metal lithium is joined to the first uncoated region and immersed in electrolytic solution.

Abstract: One object is to provide an electrochemical device having a small inner resistance and a high reliability in a high temperature and a high voltage. In accordance with one aspect, the electrochemical device of the present invention includes a positive electrode and a negative electrode. At least one of the positive electrode and the negative electrode includes a current collector layer and an active material layer formed on at least one surface of the current collector layer, and the active material layer includes electrode active material bodies and a mixture film formed between the electrode active material bodies, the mixture film having a thickness of 0.1 ?m to 0.4 ?m.

Abstract: The present application provides an electric double-layer capacitor capable of reducing an internal resistance without exerting a large stress on a positive electrode body, a negative electrode body, and separators. The electric double-layer capacitor according to the present invention is obtained by housing a capacitor element impregnated with an electrolytic solution in a case. The capacitor element is obtained by stacking and winding a positive electrode body, separators, and a negative electrode body. The positive electrode body has positive electrode current collector tabs fixed on positive electrode current collectors. The negative electrode body has negative electrode current collector tabs fixed on negative electrode current collectors. The paired positive electrode current collector tab are displaced from each other and the paired negative electrode tabs are displaced from each other in a state where the positive electrode body and the negative electrode body are not wound.

Abstract: An electric storage cell has an electric storage element and a covering body. The covering body houses the electric storage element and has a metal layer with a first principal face on the electric storage element side and a second principal face on the opposite side, an internal resin layer made of resin laminated onto the first principal face, and an external resin layer made of resin laminated onto the second principal face, with a groove part formed on the second principal face side of the metal layer. The above structures provides a highly reliable electric storage cell, covering film, and electric storage module capable of releasing the rising internal pressure safely in the event of abnormality.

Abstract: The present application provides an electric double-layer capacitor capable of reducing an internal resistance without exerting a large stress on a positive electrode body, a negative electrode body, and separators. The electric double-layer capacitor according to the present invention is obtained by housing a capacitor element impregnated with an electrolytic solution in a case. The capacitor element is obtained by stacking and winding a positive electrode body, separators, and a negative electrode body. The positive electrode body has positive electrode current collector tabs fixed on positive electrode current collectors. The negative electrode body has negative electrode current collector tabs fixed on negative electrode current collectors. The paired positive electrode current collector tab are displaced from each other and the paired negative electrode tabs are displaced from each other in a state where the positive electrode body and the negative electrode body are not wound.