SAFT

The invention relates to an electrochemical element and a battery comprising one or more electrochemical elements, with integrated sensors and/or actuators, in particular including an application for monitoring the operation of an electrochemical element or a Li-ion battery, and/or triggering actions in such an element or such a battery, intended to secure the element or the battery. The electrochemical element ( 1 ) comprises a closed shell ( 2 ) defining an internal volume and a beam ( 3 ) arranged therein having alternating positive and negative electrodes respectively connected to two positive and negative electrical output terminals housing separators, the beam ( 3 ) being impregnated with electrolyte and further connected by connection means ( 4 ) to one ( 5 ) of the electrical output terminals. It further comprises one or mote self-powered sensor and/or actuator elements ( 20 to 24 ) each arranged in contact with one component selected from the shell ( 2 ), the beam ( 3 ), the connection means ( 4 ), and the output terminal ( 5 ), and capable of measuring a physical or chemical magnitude relative to, and/or generating a physical action or effect on, the surroundings thereof.

A method for treating a surface of a strip or film, the strip or film being made of lithium or a lithium-based alloy, the method comprising a step of radiating at least one portion of the surface of the strip or film with a laser beam, the radiating step being carried out in a controlled atmosphere, the laser beam radiating the entire area of the at least one portion of the surface of the strip or film.

The present invention provides a mixed porous negative electrode comprising graphite and solid electrolyte particles, the structure and composition of which make it possible to increase the amount and quality of the lithium deposition while avoiding large variations in thickness.

The present invention relates to a method for charging an electrochemical cell of a rechargeable battery with charging pulse control (PL), the pulses (PL) being driven in voltage control mode in the form of voltage steps (Pt) of variable amplitude. According to the invention, the method consists in calculating the value (Ut+1) of each voltage step (Pt+1) with respect to the value (Ut) of the preceding voltage step (Pt) and according to a progression variable representative of the variation in the internal resistance of the cell (d(R)/dt), for a period ending on the preceding step (Pt), with respect to a predetermined tolerated variation threshold (α), where Var=d(R)/dt−α. The method applies to high-voltage electric battery charging protocols for electromobility or stationary applications, or portable device batteries, for example.

The electrode comprises: a support defining a first lateral edge and an upper edge extending from the first lateral edge; a layer containing an active substance covering the support; and an electrical-connection tab devoid of the layer containing the active substance, the tab projecting from the upper edge in the vicinity of the first lateral edge; The electrode defines, in the vicinity of a second lateral edge of the support, a cutout extending, set back from the upper edge, in the continuation of the upper edge, towards the second lateral edge.

The invention concerns a method for estimating the state of health (SOH) of an electrochemical element, comprising: initiating a charging or discharging operation of the electrochemical element; measuring values representing deformations of the electrochemical element while the charging or discharging operation is being performed, the deformation values measured forming a deformations image signal according to the quantity of electricity passing through the electrochemical element over time; comparing the deformations image signal and a reference image signal, one or more differences obtained by the comparison characterising an estimation of the ageing of the electrochemical element.

A connection element for electrically, and mechanically connecting in a direction of connection, a first terminal of a first accumulator to a second terminal of a second accumulator, the first terminal and the second terminal protruding in a thickness direction, the connection element comprising a metal body having a first wing suitable for being welded onto the first terminal, a central part, and a second wing suitable for being welded onto the second terminal, the central part having a U-shape or a V-shape, the first wing and the second wing extending along the legs of the “U” or the “V”, respectively, the connection element being less prominent than, or at the same level in the thickness direction as at least one of the first terminal and of the second terminal.

The present invention relates to an electrode covered, on all or part of its surface thereof, with a coating layer made of an electronically insulating and ionically conductive as well as the method for preparing said electrode. The present invention also relates to the protection of sulfur electrolytes in order to improve their stability with regard to moisture, in particular by means of a layer comprising an ionically conductive inorganic material comprising a halogen-type anion.

Such electrochemical unit comprises a first stack of electrochemical cells provided with a first electrical connection tab, a second stack of electrochemical cells provided with a second electrical connection tab, a common connection element, electrically connecting the first electrical connection tab and the second electrical connection tab and suitable for electrically connecting the first electrical connection tab and the second electrical connection tab to a connection terminal with a first polarity. The common connection element is connected by a material bond to the first electrical connection tab and to the second electrical connection tab. Application to electrochemical batteries.

The use of a blend of a lithium nickel oxide and a lithium manganese iron phosphate as an active material composition in the cathode of a lithium secondary electrochemical cell for automotive applications, such as hybrid and electric vehicles. This blend allows decreasing the porosity of a lithium manganese iron phosphate-based cathode. It also allows improving the detectability of a gas release in the cell in case of an abnormal operation of the cell. It allows lowering the cell impedance at a low state of charge, typically less than 30%, and reducing the impedance increase of the cell during the cell lifespan.