Device for managing an accumulator

Patent metadata

Field	Value
Publication number	US-10020546-B2
Application number	US-201414786853-A
Country	US
Kind code	B2
Filing date	Apr 23, 2014
Priority date	Apr 23, 2013
Publication date	Jul 10, 2018
Grant date	Jul 10, 2018

Abstract

A device for managing an accumulator, including: a plurality of strain gauges including at least three strain gauges, the strain gauges being arranged to measure stresses along at least three distinct stress axes; a measuring device measuring strains undergone by each gauge along its stress axis; a reversible electrical switch; a calculating device controlling opening and closing of the electrical switch, depending on measurements carried out by the measuring device.

First claim

The invention claimed is:

1. A device for managing an accumulator, comprising:
a plurality of strain gauges including at least three strain gauges, the strain gauges being configured to measure stresses along at least three distinct stress axes;
circuitry configured to measure strains undergone by each gauge along its stress axis;
a reversible electrical switch;
a processor configured to determine a state of charge of the accumulator based on the measured strains and configured to control opening and closing of the reversible electrical switch, depending on the determined state of charge of the accumulator.

2. A device for managing an accumulator according to claim 1 , the processor including storage storing a first series of values and a second series of values being different from the first series of values, the processor controlling:
closing the reversible electrical switch when the measured strains belong to the first series of values; and
opening the reversible electrical switch when the measured strains belong to the second series of values.

3. A device for managing an accumulator according to claim 2 , the processor configured to implement an algorithm comprising calculating evolution of the stresses measured by the plurality of strain gauges.

4. A device for managing an accumulator according to claim 3 , the processor configured to implement an algorithm identifying a result of the evolution of the stresses, measured by the plurality of strain gauges, in the first series of values or in the second series of values stored by the storage.

5. A device for managing an accumulator according to claim 4 , the calculating the evolution of the stresses comprising calculating the abscissa and the radius of the Mohr circle at a time t.

6. A device for managing an accumulator according to claim 1 , the plurality of strain gauges being held in contact with a cover including a connection terminal, and including at least one accumulator including at least one connection terminal, such that the strain gauges measure mechanical stresses exerted on the cover.

7. A device for managing an accumulator according to claim 6 , the connection terminal of the cover being connected to the reversible electrical switch and to the connection terminal of the accumulator.

8. A device for managing an accumulator according to claim 6 , the accumulator being wound around a mandrel.

9. A device for managing an accumulator according to claim 6 , the accumulator being a lithium accumulator.

10. A device for managing an accumulator according to claim 6 , wherein the device is included in a pack comprising the cover including the connection terminal, connected to the connection terminals belonging to at least two accumulators contained in the cover, the device corresponding to one of the accumulators.

11. A method for calibrating a managing device according to claim 6 , comprising recording a first series of measurements, on a storage included in the processor, the measurements being carried out by the circuitry, upon charging and discharging an accumulator, to maintain integrity of the accumulator.

12. A method for calibrating a managing device according to claim 11 , further comprising recording a second series of measurements, on the storage included in the processor, the measurements being carried out by the circuitry, upon charging and discharging an accumulator, to prevent an irreversible damage of the integrity of the accumulator.

Assignees

• Commissariat Energie Atomique
• Commissariat Energie Atomique

Inventors

• Genies Sylvie
• Alias Melanie
• Coutier Caroline
• Le Baron Estelle
• Mailley Sophie

Classifications

• H01M10/482 Primary

  for several batteries or cells simultaneously or sequentially · CPC title

• H01M10/48 Primary

  Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte (constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals, H01M50/569) · CPC title

• H01M2200/20

  Pressure-sensitive devices · CPC title

• H01M2010/4271

  Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing · CPC title

• H01M2/345

  Electricity · mapped topic