A negative electrode comprises a negative electrode collector, a first negative electrode mixture layer that is provided on the surface of the negative electrode collector, and a second negative electrode mixture layer that faces the positive electrode; the first negative electrode mixture layer and the second negative electrode mixture layer contain graphite particles; the ratio of the void fraction (S2) among the graphite particles in the second negative electrode mixture layer to the void fraction (S1) among the graphite particles in the first negative electrode mixture layer, namely S2/S1 is from 1.1 to 2.0; the ratio of the packing density (D2) of the second negative electrode mixture layer to the packing density (D1) of the first negative electrode mixture layer, namely D2/D1 is from 0.9 to 1.1; and the separator has a thickness of 10 μm or less, while having a porosity of from 25% to 45%.

Provided is a cylindrical battery with which it is possible to suppress an increase in weight while increasing capacity. A cylindrical battery includes: an electrode body comprising a positive electrode and a negative electrode, which are wound together via a separator; an electrolyte; a bottomed cylindrical outer can for accommodating the electrode body and the electrolyte; and a sealing body that is fixed to an open end portion of the outer can by swaging and is for sealing the outer can. In regard to the outer can, the outer diameter of a body part for accommodating the electrode body is 20 mm or greater, and the outer diameter of the open end portion for accommodating the sealing body is less than the outer diameter of the body part.

Provided is a cylindrical battery with which it is possible to suppress an increase in weight while increasing capacity. A cylindrical battery includes: an electrode body comprising a positive electrode and a negative electrode, which are wound together via a separator; an electrolyte; a bottomed cylindrical outer can for accommodating the electrode body and the electrolyte; and a sealing body that is fixed to an open end portion of the outer can by swaging and is for sealing the outer can. In regard to the outer can, the outer diameter of a body part for accommodating the electrode body is 20 mm or greater, and the outer diameter of the open end portion for accommodating the sealing body is less than the outer diameter of the body part.

An electrochemical apparatus includes a first electrode plate and a first tab. The first electrode plate includes a current collector and an active material layer disposed on the current collector. The current collector includes a first surface, a first side and a second side opposite to the first side; the first surface is provided with a first blank region and the first tab is electrically connected to the first blank region and protrudes from the first side. A first tab adhesive is provided on the first tab, where the first tab adhesive includes a first adhesive layer, and the first adhesive layer includes a third side facing toward the second side. A minimum distance D.sub.1 mm between the third side and the second side and a distance W mm between the first side and the second side satisfy D.sub.1<W.

An electrochemical cell includes a winding comprising a ribbon-shaped negative electrode with an anode current collector and a ribbon-shaped positive electrode with a cathode current collector. An assembly comprises the negative electrode and the positive electrode, the assembly is wound spirally around a winding axis to form the winding, the winding comprises a central cavity, two terminal end faces, and a circumferential winding shell. The electrochemical cell further includes a contact sheet metal member in direct contact with a protruding longitudinal edge of the anode current collector or the cathode current collector. In addition, the electrochemical cell includes a housing, a sensor apparatus configured detect changes in a state of the winding, and a display and/or a contact configured to display measured values and/or via which the measured values can be transmitted.

A lithium ion cell includes a ribbon-shaped electrode-separator assembly having an anode, a separator, and a cathode. The electrode-separator assembly has two terminal end faces or two terminal sides. The anode comprises a ribbon-shaped anode current collector having a first longitudinal edge, the cathode comprises a ribbon-shaped cathode current collector having a first longitudinal edge, and the electrode-separator assembly is enclosed in a housing. The first longitudinal edge of the anode current collector protrudes from one of the terminal end faces or terminal sides of the stack and the first longitudinal edge of the cathode current collector protrudes from the other. A contact sheet metal member is in direct contact with a respective longitudinal edge. A part of the housing serves as the contact sheet metal member and/or the contact sheet metal member forms a part of the housing enclosing the electrode-separator assembly.

A lithium ion cell includes a ribbon-shaped electrode-separator assembly having an anode, a separator, and a cathode. The electrode-separator assembly has two terminal end faces or two terminal sides. The anode comprises a ribbon-shaped anode current collector having a first longitudinal edge, the cathode comprises a ribbon-shaped cathode current collector having a first longitudinal edge, and the electrode-separator assembly is enclosed in a housing. The first longitudinal edge of the anode current collector protrudes from one of the terminal end faces or terminal sides of the stack and the first longitudinal edge of the cathode current collector protrudes from the other. A contact sheet metal member is in direct contact with a respective longitudinal edge. A part of the housing serves as the contact sheet metal member and/or the contact sheet metal member forms a part of the housing enclosing the electrode-separator assembly.

A separator, a lithium-ion cell including the separator, and an electric apparatus including the lithium-ion cell. The separator includes a separator substrate and a coating layer disposed on the separator substrate, and the separator is adhered to an adjacent first electrode plate or second electrode plate through the coating layer. The coating layer is configured to decrease a peel force between the separator and an external component when a temperature is higher than a preset threshold or to be capable of chemically reacting with an acidic substance. When the temperature is higher than a threshold, the peel force between the separator and an adjacent electrode plate is decreased. To be specific, such lithium-ion cell can improve a current situation that the peel force between the separator and the electrode plate remains relatively great when the temperature of the cell is higher than a threshold.

A lithium-ion cell includes a ribbon-shaped electrode-separator assembly having an anode, a cathode, and a separator. The electrode-separator assembly is in the form of a winding with two terminal end faces. The anode has a ribbon-shaped anode current collector with a free edge strip extending along a first longitudinal edge that is not loaded with negative electrode material. The cathode has a ribbon-shaped cathode current collector with a free edge strip extending along a first longitudinal edge that is not loaded with positive electrode material. The separator has at least one inorganic material that improves its resistance to thermal stress. The lithium-ion cell further includes a housing enclosing the electrode-separator assembly and a metallic contact element. The metallic contact element is connected to a respective first longitudinal edge of one of the current collectors by a weld.

An electrochemical apparatus including an electrode assembly including a first electrode plate, a second electrode plate and a separator disposed between the first electrode plate and the second electrode plate. The first electrode plate includes a current collector and an active material layer, the current collector includes a first zone and a second zone, the second zone is provided with an active material layer, the first zone includes a third zone and a fourth zone, the third zone is arranged in overlap with the separator, and the fourth zone is provided with a conductive layer. The conductive layer is disposed in a zone of the current collector that has no active material layer disposed thereon and that does not overlap the separator.