Devices for testing a battery and methods for testing a battery

Patent metadata

Field	Value
Publication number	US-9551759-B2
Application number	US-201214345632-A
Country	US
Kind code	B2
Filing date	Sep 19, 2012
Priority date	Sep 19, 2011
Publication date	Jan 24, 2017
Grant date	Jan 24, 2017

Abstract

In various embodiments, a device for testing a battery may be provided. The device for testing a battery may include: a determination circuit configured to determine at least one of a differential enthalpy of the battery and a differential entropy of the battery; and an evaluation circuit configured to evaluate a health state of the battery based on the determined at least one of the differential enthalpy and the differential entropy.

First claim

What is claimed is:

1. A device for testing a battery, the device comprising:
a determination circuit configured to determine for a plurality of charging states of the battery at least one of a derivative entropy of the battery and a differential entropy of the battery; and
an evaluation circuit configured to evaluate a health state of the battery based on the determined at least one of the derivative entropy and the differential entropy of the battery for the plurality of charging states of the battery, wherein:
the derivative entropy of the battery is based on an entropy state function of the battery and at least one of a lithium stoichiometry in an anode of the battery and a lithium stoichiometry in a cathode of the battery; and
the differential entropy of the battery is based on the entropy state function of the battery before exposure to at least one of a substantial voltage and a substantial temperature and on the entropy state function of the battery after exposure to the at least one of the substantial voltage and the substantial temperature.

2. The device of claim 1 , further comprising:
a charging circuit configured to charge the battery.

3. The device of claim 1 , further comprising:
a discharging circuit configured to discharge the battery.

4. The device of claim 1 , further comprising:
at least one of a heating circuit configured to heat the battery and a cooling circuit configured to cool the battery.

5. The device of claim 1 , further comprising:
an entropy measuring circuit configured to measure an entropy of the battery.

6. The device of claim 1 , further comprising:
an enthalpy measuring circuit configured to measure an enthalpy of the battery.

7. The device of claim 1 , further comprising:
an entropy measuring circuit configured to measure an entropy of a new battery and to measure an entropy of a used battery;
wherein the determination circuit is further configured to determine the differential entropy of the battery based on the measurement of the entropy of the new battery and the measurement of the entropy of the used battery.

8. The device of claim 1 , further comprising:
an enthalpy measuring circuit configured to measure an enthalpy of a new battery and to measure an enthalpy of a used battery;
wherein the determination circuit is further configured to determine a differential enthalpy of the battery based on the measurement of the enthalpy of the new battery and the measurement of the enthalpy of the used battery.

9. The device of claim 1 ,
wherein the determination circuit is further configured to determine derivative enthalpies of the battery for a plurality of charging states of the battery; and
wherein the evaluation circuit is configured to evaluate the health state of the battery based on the determined derivative enthalpies of the battery for the plurality of charging states of the battery.

10. The device of claim 1 ,
wherein the determination circuit is configured to determine derivative entropies of the battery for a plurality of charging states of the battery; and
wherein the evaluation circuit is configured to evaluate the health state of the battery based on the determined derivative entropies of the battery for the plurality of charging states of the battery.

11. The device of claim 1 ,
wherein the determination circuit is configured to determine differential enthalpies of the battery for a plurality of charging states of the battery; and
wherein the evaluation circuit is configured to evaluate the health state of the battery based on the determined differential enthalpies of the battery for the plurality of charging states of the battery.

12. The device of claim 1 ,
wherein the determination circuit is configured to determine differential entropies of the battery for a plurality of charging states of the battery; and
wherein the evaluation circuit is configured to evaluate the health state of the battery based on the determined differential entropies of the battery for the plurality of charging states of the battery.

13. The device of claim 1 , wherein the device is a chip.

14. The device of claim 13 , wherein the chip is embedded in the battery.

15. The device of claim 13 , wherein the chip is embedded in a battery module.

16. The device of claim 13 , wherein the chip is embedded in a battery pack.

17. The device of claim 1 , wherein the derivative entropy of the battery is at least substantially equal to:
a derivative of an entropy state function of the battery with respect to at least one of the lithium stoichiometry in the anode of the battery and the lithium stoichiometry in the cathode of the battery.

18. The device of claim 1 , wherein the derivative entropy of the battery is at least substantially equal to:

δ
⁢

⁢

S
⁡

(
x
)

=

∂
Δ

⁢

⁢

S
⁡

(
x
)

∂
x

;

wherein “ΔS(x)” refers to an entropy state of the battery as a function of x;
wherein “x” refers to the at least one of the lithium stoichiometry in the anode of the battery and the lithium stoichiometry in the cathode of the battery;
wherein “δ S(x)” refers to a derivative entropy state of the battery as a function of “x”;
wherein

“

∂
Δ

⁢

⁢

S
⁡

(
x
)

∂
x

”

refers to a derivative entropy state function of the battery with respect to “x”.

19. The device of claim 1 , wherein the differential entropy of the battery is at least substantially equal to:
a difference between the entropy state function of the battery before exposure to the at least one of the substantial voltage and the substantial temperature and the entropy state function of the battery after exposure to the at least one of substantial voltage and thesubstantial temperature.

20. The device of claim 1 , wherein the differential entropy of the battery is at least substan

Assignees

• Univ Nanyang Tech

Inventors

• Yazami Rachid
• Maher Kenza

Classifications

• H01M10/4257

  Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries · CPC title

• H01M10/615

  Heating or keeping warm · CPC title

• G01R31/3648

  comprising digital calculation means, e.g. for performing an algorithm · CPC title

• H01M10/613

  Cooling or keeping cold · CPC title

• H01M10/4285

  Testing apparatus · CPC title