Abstract: The present patent application relates to a device for a lithium electrochemical generator, said device comprising a band (100) of electrical insulating material including at least one polymer, and at least one metallic layer (102) which forms a current collector and is deposited on at least one of the two main faces in the central part of the band. The central part (100C) of the band comprises a plurality of holes (101) emerging on its two opposite main faces, said holes being filled at least partially with a metal that is continuous with each deposited metallic layer. The periphery of the band (100P) is devoid of metallic layer and at least one metallic layer is covered with an electrode of lithium insertion material.

Abstract: The present invention relates to a metal-ion accumulator (A), comprising a stack of elementary electrochemical cells, each comprising a cathode (2), an anode (3), and a separator (1) impregnated with electrolyte intercalated between the anode and the cathode, each anode and cathode consisting of a substrate (2S, 3S) formed from a metal foil comprising a central portion (22, 32) supporting, on at least one of its main faces, a layer of active metal ion insertion material, the porosity of the layers of active material of the electrodes of one of the given polarities (anode or cathode) having at least two different values in the stack, the highest porosity being that of at least one electrode of said polarity, arranged between the center and the ends of the stack.

Abstract: The invention relates to a device for a lithium electrochemical generator, having an elongate shape along a longitudinal axis (X), comprising a strip comprising a current collector central portion that is at least partially electrically conductive, in which at least one of the two main surfaces is covered with an electrode consisting of a lithium insertion material, and at least two side peripheral portions connected to the central portion and extending transversely to the longitudinal axis, the side peripheral portions being made of an electrically insulating material comprising at least one polymer, the insulating material of at least one of the two side portions being resiliently or plastically deformable, the dimensions of the latter also being determined such as to allow the deformation thereof without breaking during the winding of the strip about a winding axis, which is transverse to the axis (X) and adjacent to the other one of the two side peripheral portions.

Abstract: The present invention relates to an electrode (2, 3) for an electrochemical bundle of a metal-ion storage battery or of a supercapacitor, comprising a substrate (2S, 3S) formed from a metal strip that supports an active metal-ion insertion material (2I, 3I) in its central portion (22, 32), while its lateral band, referred to as the edge (20, 30), is devoid of active insertion material, the lateral band comprising an end area (21, 31), in which the properties of the metal material and/or geometry of which is/are modified in relation to the rest of the strip in the edge (20, 30) and in the central portion (22, 32), so as to cause localized plastic buckling in the end area when a predetermined compressive force (E) is applied to the end area, the central portion not deforming under the predetermined compressive force.

Abstract: The present invention relates to a lithium-ion electrochemical accumulator comprising an electrode assembly, a casing arranged to sealably contain the electrode assembly, two current output terminals each connected to one or other of the anode(s) and cathode(s) of the assembly, one of the terminals, called the first terminal, passing through a wall of the casing and being electrically insulated therefrom. According to the invention, the first terminal comprises a first conductive part passing through the casing and comprising a portion at least one region of which is welded directly to the bottom.

Abstract: An electrochemical accumulator including: at least one electrochemical cell made of at least one cathode and one anode and, on either side of an electrolyte, two current collectors, one of which is connected to the anode and the other to the cathode; a housing made of aluminium alloy arranged such as to sealingly contain the electrochemical cell(s); two current-output terminals, one of which is welded to a wall of the housing, the output terminal welded to the housing being made of an aluminium alloy having a magnesium content (Mg) that is no lower than 0.01% and no higher than 4%, and a copper content that is no lower than 0.05% and no higher than 0.3%, the aluminium alloy of the output terminal welded to the housing having a metallurgical state which grants same a breaking strength (Rm) of no less than 60 MPa.

Abstract: The invention relates to a lithium-ion electrochemical accumulator—or Li-ion battery—having improved leak tightness of the liquid electrolyte contained therein. The architecture of the accumulator may be monopolar or bipolar. According to the invention, the sealing of the liquid electrolyte contained in the accumulator is improved through the presence of a leak-tight device or a plurality of leak-tight devices comprising a polymer that, in contact with the liquid electrolyte, converts to a gel in which the electrolyte is trapped and immobilised. Applications: any field in which Li-ion batteries of monopolar or bipolar architecture are likely to be used, and in particular in the manufacture of electric or hybrid vehicles and portable electronic devices (telephones, touchpads, computers, cameras, camcorders, etc).

Abstract: The present invention relates to a metal-ion accumulator (A), comprising a stack of elementary electrochemical cells, each comprising a cathode (2), an anode (3), and a separator (1) impregnated with electrolyte intercalated between the anode and the cathode, each anode and cathode consisting of a substrate (2S, 3S) formed from a metal foil comprising a central portion (22, 32) supporting, on at least one of its main faces, a layer of active metal ion insertion material, the porosity of the layers of active material of the electrodes of one of the given polarities (anode or cathode) having at least two different values in the stack, the highest porosity being that of at least one electrode of said polarity, arranged between the center and the ends of the stack.

Abstract: A lithium electrochemical storage battery including: at least one electrochemical cell; two current collectors, one of which is connected to the anode and the other to the cathode; and a casing of longitudinal axis X, the casing including a cap, a bottom, a lateral jacket joined both to the bottom and to the cap, and a central core arranged along the axis X, the central core being hollow at least over some of its height and made of a material the melting point of which is higher than the temperature reached by the cell when it malfunctions, the hollow portion of the central core opening onto the exterior of casing via the bottom and/or the cap and the central core having, at least one end of its hollow portion, an internal thread into which an external thread of a part forming one pole of the storage battery may be screwed.

Abstract: The present invention relates to a lithium-ion electrochemical accumulator comprising an electrode assembly, a casing arranged to sealably contain the electrode assembly, two current output terminals each connected to one or other of the anode(s) and cathode(s) of the assembly, one of the terminals, called the first terminal, passing through a wall of the casing and being electrically insulated therefrom. According to the invention, the first terminal comprises a first conductive part passing through the casing and comprising a portion at least one region of which is welded directly to the bottom.

Abstract: This current collector for a lithium electrochemical accumulator includes an electronically-insulating viscoelastic foam associated with an electroconductive polymer film.

Abstract: An electrochemical accumulator including: at least one electrochemical cell made of at least one cathode and one anode and, on either side of an electrolyte, two current collectors, one of which is connected to the anode and the other to the cathode; a housing made of aluminium alloy arranged such as to sealingly contain the electrochemical cell(s); two current-output terminals, one of which is welded to a wall of the housing, the output terminal welded to the housing being made of an aluminium alloy having a magnesium content (Mg) that is no lower than 0.01% and no higher than 4%, and a copper content that is no lower than 0.05% and no higher than 0.3%, the aluminium alloy of the output terminal welded to the housing having a metallurgical state which grants same a breaking strength (Rm) of no less than 60 MPa.

Abstract: A lithium electrochemical storage battery including: at least one electrochemical cell; two current collectors, one of which is connected to the anode and the other to the cathode; and a casing of longitudinal axis X, the casing including a cap, a bottom, a lateral jacket joined both to the bottom and to the cap, and a central core arranged along the axis X, the central core being hollow at least over some of its height and made of a material the melting point of which is higher than the temperature reached by the cell when it malfunctions, the hollow portion of the central core opening onto the exterior of casing via the bottom and/or the cap and the central core having, at least one end of its hollow portion, an internal thread into which an external thread of a part forming one pole of the storage battery may be screwed.

Abstract: The invention relates to an electrochemical lithium accumulator comprising a stack of at least two electrochemical cells, each cell being separated from its adjacent cell by a current-collecting substrate, a first face of this substrate being occupied by an electrode of a cell while a second substrate face opposite to the first is occupied by an electrode of its adjacent cell, each cell comprising a positive electrode and a negative electrode separated by an electrolyte, characterized in that the electrolyte comprises a lithium polysulfide additive.

Abstract: The invention relates to an electrochemical lithium accumulator comprising at least one first electrochemical cell and at least one second electrochemical cell separated from each other by a current-collecting substrate, which substrate supports on a first face, an electrode of said first electrochemical cell, and on its second face opposite to said first face, an electrode of opposite sign of said second electrochemical cell, each cell comprising a positive electrode and a negative electrode separated by an electrolyte, characterized inter alia in that said current-collecting substrate is in copper or in copper alloy.

Abstract: A bipolar lithium-ion electrochemical battery having increased capacity.

Abstract: This current collector for a lithium electrochemical accumulator includes an electronically-insulating viscoelastic foam associated with an electroconductive polymer film.

Abstract: In lithium bipolar batteries, to improve sealing against electrolytes between adjacent electrochemical cells, mixed current collector-electrode supports are produced, in a form of a metal grate or raised metal sheet housed in a strip made of electrical insulator material, the function of the periphery of which is to constitute a sealing area.

Abstract: The invention relates to a device for a lithium electrochemical generator, having an elongate shape along a longitudinal axis (X), comprising a strip comprising a current collector central portion that is at least partially electrically conductive, in which at least one of the two main surfaces is covered with an electrode consisting of a lithium insertion material, and at least two side peripheral portions connected to the central portion and extending transversely to the longitudinal axis, the side peripheral portions being made of an electrically insulating material comprising at least one polymer, the insulating material of at least one of the two side portions being resiliently or plastically deformable, the dimensions of the latter also being determined such as to allow the deformation thereof without breaking during the winding of the strip about a winding axis, which is transverse to the axis (X) and adjacent to the other one of the two side peripheral portions.

Abstract: A lithium-ion storage battery includes LiFePO4 as an active material for a positive electrode, an active material for a negative electrode having a lithium insertion/extraction potential equal to or greater than 0.5 V vs. Li+/Li, and a separating element placed between the positive and negative electrodes. The active material for the negative electrode is a lithiated titanium oxide, a derivative of a lithiated titanium oxide, a non lithiated titanium oxide, a derivative of a non lithiated titanium oxide or a mixture thereof. The separating element is formed from a non-woven fabric comprising cellulose fibers or glass fibers of nanometric and/or micrometric size.