Alcatel

Saft

Thierry Berlureau

Jean-Louis Liska

Gerard Rigobert

Christian Jordy

Alexandre Narbonne

Marc Bariand

Richard Roy

Matthieu Leyko

Gérard Rigobert

The invention relates to an electrochemical element () comprising: a) a container () comprising an opening allowing the introduction of at least one electrochemical beam (); and b) a closing part () for closing said container, comprising: i) at least one flat inner surface () which is oriented towards the inside of the container and can be directly electrically connected to a current collector (), ii) at least one flat outer surface () which is oriented towards the outside of the container and can act as a terminal of the electrochemical element, and iii) at least one wall () connecting said at least one flat inner surface to said at least one flat outer surface, said wall forming an angle of between 70 and 120&#xb0; in relation to one of the two flat surfaces. The closing part of the container allows heat dissipation to be improved in the direction of the longitudinal axis of the element.

Cover for an electrochemical cell with enhanced heat conduction

An industrial type vented cell storage battery includes an electrode package including at least one positive electrode containing nickel hydroxide, one negative electrode, and one hydrophilic and gas-permeable separator an extension of which beyond said electrode package is in contact with the electrolyte contained in said space. It also includes an oxygen recombination device. It contains an excess quantity of alkaline electrolyte. A space between the base of the electrode package and the bottom of the container contains at least some of the excess quantity of electrolyte.

Maintenance-free industrial type vented cell storage battery

An aqueous alkaline electrolyte Ni-MH sealed secondary storage cell includes a bundle of electrodes placed in a container and made up of a plurality of negative and positive electrodes. The space separating the negative electrode from the positive electrode contains a separator. The separator is permeable to gases and a recombination device is placed between two adjacent negative electrodes and has a wetting angle of at least 45&deg;, an average pore section of at least 10 &mgr;m , and a thickness from 0.2 mm to 5 mm.

Sealed storage cell with an improved recombination device

Method of controlling the discharging of a secondary storage cell battery

A sealed nickel-metal hydride storage cell comprises a positive electrode whose electrochemically reactive material is a hydroxide containing principally nickel and a negative electrode whose electrochemically active material is an intermetallic compound capable of forming a hydride when charged. The total quantity of electrochemically active material in the negative electrode exceeds the total quantity of electrochemically active material in the positive electrode so that the total negative capacity exceeds the total positive capacity by an amount of at least 15% referred to as the overcapacity. Part of the overcapacity, referred to as the precharge, is partly in the charged state when the positive electrode is completely discharged and the remaining part, referred to as the surplus, is in the discharged state when the positive electrode is completely charged. The precharge is less than 10% of the negative overcapacity.

Sealed nickel-metal hydride storage cell

The present invention provides a method of controlling rapid charging of an alkaline-electrolyte industrial storage cell of the 'maintenance-free' or 'sealed' type, the cell possessing a nominal capacity Cn, a voltage U, and an internal temperature T, wherein charging is stopped at a percentage charge greater than 75% of Cn as follows:

Method of controlling rapid charging of an industrial storage cell

A method of charging an industrial maintenance-free Ni-MH storage cell, the method comprising in combination a first stage at a constant current I.sub.1 lying in the range I.sub.c /10 to I.sub.c /2, and a second stage at a constant current I.sub.2 lying in the range I.sub.c /50 to I.sub.c /10, the changeover from the first stage to the second stage taking place when the time derivative of the temperature reaches a threshold value which varies as a function of the temperature at the time of the changeover.

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Bordeaux, France

Thierry Berlureau