Battery cell impedance measurement method and apparatus
Battery cell impedance measurement method and apparatus
 CN 102,768,305 A
 Filed: 04/28/2012
 Published: 11/07/2012
 Est. Priority Date: 05/04/2011
 Status: Active Application
First Claim
1. circuit arrangement that is used for confirming the impedance of battery unit, this circuit comprises:
 First circuit is configured to produce the sampled value of representing sinusoidal waveform and cosine waveform, has N sampled value representing each sinusoidal waveform cycle and N sampled value representing each cosine waveform cycle;
Second circuit is coupled to the output of first circuit and is configured to and in response to the sampled value of cosine waveform electric current is input to said unit, and the amplitude of said electric current and the sampled value of cosine waveform are proportional;
Tertiary circuit, the voltage level that is coupled to said unit and is configured to electric current is input to the unit that this unit produces is sampled;
AndThe 4th circuit is coupled to the output of tertiary circuit and is configured to each voltage level by tertiary circuit sampling is separated into real part and imaginary part component.
Chinese PRB Reexamination
Abstract
A circuit arrangement for determining impedance of a battery cell is provided. A first circuit is configured to generate sine and cosine waveforms having N sample values per period. A second circuit is coupled to an output of the first circuit and is configured to input a current into the cell in response to the sample values of the cosine waveform. The current has an amplitude proportional to the sample values of the cosine waveform. A third circuit is coupled to the cell and configured to sample voltage levels across the cell resulting from the current being input into the cell. A fourth circuit is coupled to an output of the third circuit and is configured to separate each voltage level sampled by the third circuit into real and imaginary components.

6 Citations
The method of the real part of multiple internal resistance for determining battery  
Patent #
CN 108,291,943 A
Filed 09/29/2016

Current Assignee

Device and method for precisively measuring impedance  
Patent #
CN 1,300,945 A
Filed 12/20/1999

Current Assignee

Anomaly detection method of battery pack, battery pack and electronic apparatus  
Patent #
CN 1,929,188 A
Filed 01/24/2006

Current Assignee

Method and apparatus for measuring complex impedance of cells and batteries  
Patent #
US 6,002,238 A
Filed 09/11/1998

Current Assignee
N/A

SYSTEM FOR COMPLEX IMPEDANCE MEASUREMENT  
Patent #
US 20100237851A1
Filed 06/14/2007

Current Assignee
N/A

DETERMINATION OF THE INTERNAL RESISTANCE OF A BATTERY CELL OF A TRACTION BATTERY WHILE USING RESISTIVE CELL BALANCING  
Patent #
WO2010118909A1
Filed 02/25/2010

Current Assignee

20 Claims

1. circuit arrangement that is used for confirming the impedance of battery unit, this circuit comprises:

First circuit is configured to produce the sampled value of representing sinusoidal waveform and cosine waveform, has N sampled value representing each sinusoidal waveform cycle and N sampled value representing each cosine waveform cycle; Second circuit is coupled to the output of first circuit and is configured to and in response to the sampled value of cosine waveform electric current is input to said unit, and the amplitude of said electric current and the sampled value of cosine waveform are proportional; Tertiary circuit, the voltage level that is coupled to said unit and is configured to electric current is input to the unit that this unit produces is sampled;
AndThe 4th circuit is coupled to the output of tertiary circuit and is configured to each voltage level by tertiary circuit sampling is separated into real part and imaginary part component.


2. circuit arrangement according to claim 1, wherein the 4th circuit arrangement is for separating into real part and imaginary part component through following manner with the voltage level of each sampling:

To multiply by sinusoidal waveform to generate said imaginary part component by each voltage level of tertiary circuit sampling;
AndTo multiply by cosine waveform to generate said real component by each voltage level of tertiary circuit sampling.


3. circuit arrangement according to claim 2, wherein the 4th circuit arrangement is for separating into real part and imaginary part component through following manner with the voltage level of each sampling:

To multiply by sinusoidal waveform by each voltage level of tertiary circuit sampling, to generate said imaginary part component by first circuit generation of calibration scalar convergentdivergent;
AndTo multiply by cosine waveform by each voltage level of tertiary circuit sampling, to generate said real component by first circuit of calibration scalar convergentdivergent.


4. circuit arrangement according to claim 2, wherein the 4th circuit further is configured to:

To by the real component summation of N voltage level of tertiary circuit sampling real part of impedance component with definite said battery unit;
AndTo the imaginary part component summation of N voltage level of sampling imaginary part component with definite said battery unit impedance.


5. circuit arrangement according to claim 4, wherein the 4th circuit comprises:

The 5th circuit, the real component that is coupled and is configured to receive and add up and generated by the voltage level of tertiary circuit sampling;
AndThe 6th circuit, the imaginary part component that is coupled and is configured to receive and add up and generated by the voltage level of tertiary circuit sampling.


6. circuit arrangement according to claim 1, wherein tertiary circuit is configured at the sampling rate place that equals the cosine waveform sampling rate voltage level sampled.

7. circuit arrangement according to claim 1, wherein tertiary circuit further is configured to convert the voltage level of sampling to digital value from the analogue value.

8. circuit arrangement according to claim 1, wherein second circuit comprises:

The unit balancing circuitry is configured to the energy that is stored in a plurality of battery units that comprise said battery unit is carried out balance;
AndThe pulse number modulation (PNM) circuit is configured to drive the transistor gate of cell balancing circuit.


9. circuit arrangement according to claim 4, wherein the 4th circuit is confirmed the frequency domain equivalence value by the voltage level of tertiary circuit sampling to the frequency band corresponding with the frequency of cosine waveform.

10. circuit arrangement according to claim 1, wherein first circuit is the polynomial expression waveform generator, is configured to:

Utilize M multinomial coefficient to calculate sinusoidal waveform;
AndUtilize M the M1 in the polynomial expression multinomial coefficient to calculate cosine waveform.


11. circuit arrangement according to claim 10, wherein first circuit is a M level cascade totalizer, and the output of M level produces sinusoidal waveform, and the output of M1 level produces cosine waveform.

12. a method that is used for the impedance of definite battery unit, this method comprises:

Produce sinusoidal waveform and cosine waveform, each cycle of each waveform has N sampled point; Each sampled point to cosine waveform; The corresponding electric current of the value of amplitude and this sampled point is injected into battery unit; Convert the voltage level at two ends, unit to digital value from the analogue value;
AndThe digital value of this voltage is separated into real part and imaginary part component; The real component of N digital values is sued for peace to confirm the real part of impedance component of battery unit;
AndTo the imaginary part component of the imaginary part component of N digital values summation with the impedance of confirming battery unit.


13. method according to claim 12 wherein separates into real part and imaginary part component through following operation with the digital value of voltage:

Digital value multiply by sinusoidal waveform to produce said imaginary part component;
AndDigital value multiply by cosine waveform to produce said real component.


14. method according to claim 13 wherein separates into real part and imaginary part component through following operation with the digital value of voltage:

Digital value multiply by by the sinusoidal waveform of calibrating the scalar convergentdivergent to produce said imaginary part component;
AndDigital value multiply by by the cosine waveform of calibrating the scalar convergentdivergent to produce said real component.


15. method according to claim 12 wherein comes real component is sued for peace through the real component that when generating real component, adds up.

16. method according to claim 12 wherein converts the voltage at two ends, unit to digital value from the analogue value at the sampling rate place that equates with the sampling rate of cosine waveform.

17. an energy storage units device comprises:

A plurality of battery units of series coupled;
WithBe coupled to the impedance detection circuit of a battery unit in said a plurality of battery unit, this impedance detection circuit comprises; First circuit is configured to produce the sampled value of representing sinusoidal waveform and cosine waveform, has N sampled value representing each sinusoidal waveform cycle and N sampled value representing each cosine waveform cycle; Second circuit is coupled to the output of first circuit and is configured to and in response to the sampled value of cosine waveform electric current is input to the said battery unit in said a plurality of battery unit, and the amplitude of this electric current and the sampled value of cosine waveform are proportional; Tertiary circuit, the voltage level that is coupled to the said battery unit in said a plurality of battery unit and is configured to electric current is input to the said battery unit two ends that a said battery unit causes is sampled;
WithThe 4th circuit, be coupled to the output of tertiary circuit and be configured to; The sinusoidal waveform that will be multiply by first circuit by each voltage level of tertiary circuit sampling is to generate the imaginary part component; The cosine waveform that will be multiply by first circuit by each voltage level of tertiary circuit sampling is to generate real component; To by the real component summation of N voltage level of tertiary circuit sampling real part of impedance component with a definite said battery unit;
WithTo the imaginary part component summation of N voltage level of sampling imaginary part component with the impedance of a definite said battery unit.


18. energy storage units device according to claim 17, wherein second circuit further is configured in response to the sampled value of cosine waveform electric current is input in second battery unit in said a plurality of battery unit.

19. energy storage units device according to claim 18 also comprises:

The 5th circuit is coupled to said second battery unit of said a plurality of battery units and is configured to the voltage level that electric current is input on this second battery unit that said second battery unit causes is sampled;
WithThe 6th circuit, be coupled to the output of the 5th circuit and be configured to; The sinusoidal waveform that will be multiply by first circuit by each voltage level of the 5th circuit sampling is to generate said imaginary part component; The cosine waveform that will multiply by first circuit by each voltage level of tertiary circuit sampling is to generate said real component; To by the real component summation of N voltage level of the 5th circuit sampling to confirm the real part of impedance component of a said battery unit;
WithTo by the imaginary part component summation of N voltage level of the 5th circuit sampling imaginary part component with the impedance of confirming a said battery unit.


20. energy storage units device according to claim 17, wherein
The 4th circuit arrangement is for carrying out convergentdivergent through the calibration scalar to the sinusoidal waveform and the cosine waveform of first circuit; 
The sinusoidal waveform of first circuit that multiplies each other through the 4th circuit and each voltage level by tertiary circuit sampling is the sinusoidal waveform through first circuit of calibration scalar convergentdivergent;
WithThe cosine waveform of first circuit that multiplies each other through the 4th circuit and each voltage level by tertiary circuit sampling is the cosine waveform through first circuit of calibration scalar convergentdivergent.

Specification(s)