Commissariat &#xc0; L'&#xc9;nergie Atomique Et Aux &#xc9;nergies Alternatives

Zodiac Aero Electric

Julien Dauchy

Pierre Perichon

Daniel Chatroux

Sebastien Carcouet

Eric Fernandez

Sylvain Mercier

Olivier Deshayes

Sébastien Carcouet

Laurent Garnier

Lionel De Paoli

Edouard Bonnefous

Bruno Beranger

Julien Chauvin

Alexis Gioda

Valéry Cervantes

Andy Roux

An electric battery including: a plurality of electrical energy storage cells, each including a positive terminal and a negative terminal, the cells being arranged in a package containing a dielectric liquid; within the package, a controllable stirring device for circulating the dielectric liquid in contact with the positive and negative terminals of the cells; and a management device capable of detecting a possible failure of a cell and of accordingly controlling the stirring device to modify the dielectric liquid circulation conditions in the package.

Electric battery comprising a system for homogenizing its internal temperature

A battery unit comprises a plurality of accumulators distributed in rows, a support arranged along a row of accumulators of the plurality of accumulators, conductive strips attached to the accumulators of the row and extending over the support, a guide, the support being suitable for sliding into the guide, a metal strip extending in the guide, deformable electrical connectors fixed to the metal strip and designed to come into contact with the conductive strips when the support is fully inserted in the guide, and metal portions distributed along the metal strip, in contact with the metal strip.

Connection device for a battery

An electrical installation includes a circuit-breaker having a breaking capacity PdC and a tripping current Is, an ammeter measuring the current, and a DC voltage source comprising batteries connected in parallel and connected in series with the circuit-breaker. The sum of the short-circuit currents of the batteries connected in parallel is higher than the breaking capacity PdC of the circuit-breaker. A plurality of the batteries each includes a respective switch capable of opening a connection between the battery of the same and the circuit-breaker. The electrical installation also includes a control circuit to detect that the current passing through the circuit-breaker is higher than the tripping current Is and to control the opening of a plurality of the switches in order to apply, through the circuit-breaker, a current higher than the tripping current Is of the same and lower than the breaking capacity PdC of the same.

Protection of a power supply including a plurality of batteries in parallel against an external short circuit

An electrical power supply includes DC source outputting Vm and a device that detects insulation defects in the DC source. The device includes input terminals connected to the source's terminals, impedances Z1 and Z2 connected in series between the input terminals, where Z1=Z2=Z and Vm/Imax&#x3c;z&#x3c;(3/2)*Vm/Imax, wherein Imax is a maximum insulation defect current defined by a standardized safety threshold, and a current-detection circuit connected between ground and an intermediate point between the impedances. The current-detection circuit includes a microcontroller that receives a voltage proportional to the defect current originating from the intermediate point, the input terminal being connected by Z3 to a power supply with Vcc&#x3c;Vm, the input terminal being connected to ground by way of Z4. The microcontroller is configured to determine amplitude of an insulation defect as a function of the voltage applied to the input terminal, wherein Z*Vcc/(4*Vm)&#x3c;(Z3,Z4)&#x3c;Ztmax=Z*Vcc/2Vm.

Device for detecting a defect in insulation

A battery equalization system has two accumulator stages in series, each including an accumulator, and &#xb1;poles, a voltage generator for each accumulator stage, and an associated charging device powered by the generator. The charging device includes an inductor and capacitors. One capacitor connects to the generator's positive pole, the other connects to its negative pole, a first diode, whose anode connects to a negative pole of the accumulator stage and whose cathode connects to the first capacitor, a second diode whose anode connects to the negative pole of the accumulator stage and whose cathode connects to the second end of the second capacitor, and a switch connected to the inductor and to the positive pole of the accumulator stage, and a control device that controls the generator, closes the switch and causes the inductor to stores energy and to transfer it to the associated accumulator stage.

Charge equalization system for batteries

An electrical power supply device includes a DC voltage source with terminals, a controller, and an insulation-defect detecting device for detecting an insulation defect of the voltage source. The device has input terminals connected to source terminals, and circuits connected between respective input terminals and an intermediate point. The insulation-defect current-detection circuit connects between ground and the intermediate point. Both circuits have current-limiter circuits that open and close a connection between respective inputs and the intermediate point. Both current-limiter circuits are rated for traversal by a current of less than a standardized safety threshold when the first current-limiter circuit is closed and one of the terminals of the DC voltage source is shorted to ground. The control circuit is configured to simultaneously keep one current-limiter circuits open and the other closed.

Detection of an insulation defect

A storage battery comprises a first branch and a second branch, each of which has a first cell and a second cell, the first and second cells being connected in series, and a first switch for connecting the first cell from the first branch and the first cell from the second branch in parallel and connecting the second cell from the first branch and the second cell from the second branch in parallel. The first switch has a cutoff threshold selected to conduct current when one of the cells forms an open circuit.

Low-loss storage battery

An equalization system for batteries has two series-connected accumulator stages connected, each including an accumulator, a voltage generator including positive and negative poles, for each stage, an associated charging device supplied by the voltage generator. The charging device includes an inductor having a first and second ends, and a capacitor having first and second ends. The capacitor's first end connects to the generator's positive pole. It also has a diode whose anode connects to a negative pole of the accumulator stage and whose cathode connects to the inductor's first end. It also has a switch whose first end connects to the inductor. And it also has a control device that controls the generator and closes a switch of a charging device associated with an accumulator stage to be charged so that the inductor stores energy, and causes its transfer to that accumulator stage.

The invention relates to a device for measuring battery voltage including an accumulator (Ai), characterized in that said measuring device comprises: an alternating current generator (II), at least one first diode (D) and at least one second diode (D) arranged in series such that said first diode (D) is connected to the positive pole (+) of said accumulator (Ai) by means of the cathode thereof and to the cathode of said second diode (D) by means of the anode thereof and such that said second diode (D) is connected to the negative pole (&#x2212;) of said accumulator (Ai) by means of the anode thereof and to the anode of said first diode (D) by means of the cathode thereof, a reading capacitor (C) connected to the central point (N) between said first (D) and second (D) diodes and to a means () for determining the voltage across the terminals of said accumulator (Ai) from the voltage variation at the central point (N).

Device for measuring battery voltage and related monitoring device

The invention relates to a device for controlling the voltage of a cell of a fuel cell, characterized in that said control device comprises a first transistor (Q) associated with the cell, which is connected to the cell via the base thereof and to a current generator, and a control voltage source (VRi) inserted between the cell and the first associated transistor (Q), the control voltage source supplying a control voltage equal to the voltage differential between the first and second threshold voltages, such that: when the cell has a voltage (V) higher than a first threshold voltage, the first transistor (Q) has a voltage (Vbe), at the terminals of the base-emitter junction thereof, which is higher than the second threshold voltage, and which conducts the current, and, when the cell has a voltage (V) which is lower than the first threshold voltage, the first transistor (Q) has a voltage (Vbe), at the terminals of the base-emitter junction thereof, which is lower than the second threshold voltage and which blocks the transmission of the current.

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Chatte, France

Julien Dauchy