CN104049148A - System and method for improved accuracy in battery resistance measurement systems - Google Patents
System and method for improved accuracy in battery resistance measurement systems Download PDFInfo
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- CN104049148A CN104049148A CN201410093628.0A CN201410093628A CN104049148A CN 104049148 A CN104049148 A CN 104049148A CN 201410093628 A CN201410093628 A CN 201410093628A CN 104049148 A CN104049148 A CN 104049148A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
- G01R31/42—AC power supplies
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/42—Screening
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4285—Testing apparatus
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3835—Arrangements for monitoring battery or accumulator variables, e.g. SoC involving only voltage measurements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
A method is disclosed for reducing an influence of voltage ripple on battery test measurements of battery cells coupled in series that form a direct current (DC) bus. A calibration operation is used to obtain a ratiometric difference between first and second series connected battery cells of the DC bus, which is indicative of a variance in their respective output voltages. Voltage measurements across each of the two cells may then be obtained at least substantially simultaneously. The ratiometric difference may be used to modify the voltage measurement taken across the second cell to produce a modified voltage measurement of the second cell. A difference between the measured voltage across the first battery cell and the modified voltage measurement may then be determined, which represents a filtered DC test voltage that has substantially all of the voltage ripple removed therefrom.
Description
The cross reference of related application
The application requires to be filed in the U.S. Provisional Application No.61/781 on March 14th, 2013,393 rights and interests.More than the full content of application is incorporated by reference into herein.
Technical field
Present disclosure relates to the system and method for the battery using at uninterruptible power system is tested, and relates more specifically to for measuring more accurately the system and method for internal battery resistance of each unit of uninterrupted power source.
Background technology
This part provides the background information relevant with present disclosure, and this background information is prior art not necessarily.
Battery unit internal resistance is the indication of the health status of battery unit.In uninterrupted power source (" UPS ") system, often the battery monitoring system of use can be by periodically injecting through the pulse of the DC current of unit and measuring at current impulse test period the DC voltage producing at two ends, unit and determine individual unit internal resistance.The normal DC voltage at this voltage and two ends, unit is compared to obtain unit internal resistance.Yet the AC ripple voltage being present in inherently on uninterrupted power source (" UPS ") system DC bus causes error in test voltage is measured, and produce thus the error that internal resistance is calculated.Ripple voltage is introduced the front end of UPS DC bus by the rectification circuit of UPS, this rectification circuit applies current impulse to maintain DC bus voltage in making the desired electromotive force of the normal operation of UPS and keeping the battery unit of UPS in fully charged state from upstream power supply.The ripple voltage also inverter circuit by UPS is introduced DC bus, this inverter circuit in the process to UPS load supply electric power from the pulse of DC bus extracted current.UPS DC bus ripple voltage signal can be random and the amplitude in the voltage signal with being generated by battery unit test and the approximate scope of frequency in.Ripple voltage signal can produce the problem with respect to the signal to noise ratio (S/N ratio) of measured voltage.This can be so that may effectively carry out filtering to AC ripple voltage hardly from the d. c. voltage signal of testing the expectation generating by battery unit.
Summary of the invention
This part provides the summation to present disclosure, and characteristic comprehensively not open as its four corner or its institute.
In one aspect, it is a kind of at least substantially reducing the method for ripple voltage on the impact of the battery testing measurement of the battery unit of the coupled in series of formation direct current (DC) bus that present disclosure provides.The method can comprise carries out calibration operation to obtain the ratio rate variance between the first battery unit of DC bus and the second battery unit of DC bus, wherein, the first battery unit and the second battery unit are connected in series and have different characteristics, and this different characteristic causes the difference of the first battery unit and the second battery unit output voltage separately.Method can also comprise to the first battery unit and applies current signal and measure the voltage at the first battery unit two ends and at least substantially measure the voltage at the second battery unit two ends simultaneously.Can usage rate be poorly modified in the voltage measurement that carry out at the second battery unit two ends, to generate the modified voltage measurement of the second battery unit.Then, can determine poor between the two with the voltage at the first measured battery unit two ends and the modified voltage measurement at the second battery unit two ends, this difference represents substantially therefrom to have removed the VDCT volts ,direct-current ,test through filtering of all ripple voltages.
Present disclosure on the other hand in relate to a kind of at least substantially reducing the method for ripple voltage on the impact that forms the battery testing of battery unit of the coupled in series of direct current (DC) bus and measure.The method can comprise by following step carries out calibration operation: first obtain first voltage measurement at the first battery unit two ends of DC bus, the first battery unit forms tested battery unit, and the second voltage at the second battery unit two ends that are connected in series with the first battery unit that at least substantially simultaneously obtain DC bus is measured.The second battery unit can form reference battery unit.Can determine the ratio rate variance between the first battery unit and the second battery unit with the first voltage tester measurement and second voltage thermometrically.This can represent owing to the difference between the first battery unit of mechanical property and chemical characteristic and the output of the second battery unit than rate variance.Then, can apply current signal and can measure the voltage at the first battery unit two ends to the first battery unit.Can also measure the voltage at the second battery unit two ends.Can than rate variance, revise the voltage measurement that carry out at the second battery unit two ends with determined, generate thus the modified voltage measurement of the second battery unit.Then, can determine poor between the two with the voltage at the first measured battery unit two ends and the modified voltage measurement at the second battery unit two ends.This difference can represent substantially therefrom to have removed the VDCT volts ,direct-current ,test through filtering of all ripple voltages.
In the one side again of present disclosure, relate to a kind of at least substantially reducing the system of ripple voltage on the impact of the battery testing measurement of the battery unit of the coupled in series of formation direct current (DC) bus.This system can comprise the data-acquisition system that processor is controlled, the data-acquisition system that this processor is controlled has at least one voltage table, the data-acquisition system that this processor is controlled is configured to: obtain first voltage measurement at the first battery unit two ends of DC bus, wherein, the first battery unit forms tested battery unit.With the first voltage measurement at least substantially side by side, the second voltage at the second battery unit two ends that are connected in series with the first battery unit that can also obtain DC bus is measured.The second battery unit forms reference battery unit.Then, the first voltage tester measurement and second voltage thermometrically can be used to calibration operation to determine the ratio rate variance between the first battery unit and the second battery unit.This can represent owing to the first battery unit one of at least in mechanical property and chemical characteristic and the difference between the output of the second battery unit than rate variance.Current source can be used to obtain the voltage at the first battery unit two ends and the voltage at the second battery unit two ends to the first battery unit Injection Current signal and with at least one voltage table.Data acquisition subsystem can also be configured to than rate variance, be modified in the voltage measurement that carry out at the second battery unit two ends with determined, to generate the modified voltage measurement of the second battery unit.Then, the modified voltage measurement at the voltage at the first measured battery unit two ends and the second battery unit two ends can be used to determine poor between the two, and this difference can represent substantially therefrom to have removed the VDCT volts ,direct-current ,test through filtering of all ripple voltages.
According to the description providing herein, it is obvious that the applicability of more areas will become.Description in this general introduction and concrete example are only intended to the object of explanation and are not intended to limit the scope of the disclosure.
Accompanying drawing explanation
Accompanying drawing described herein is only for the object that selected embodiment is described, and is not all possible realization, and is not intended to limit the scope of the disclosure.Run through several accompanying drawings, corresponding Reference numeral is indicated corresponding part.In the accompanying drawings:
Fig. 1 is the high-level diagram of a part with the ups system of six battery units in a string, and Fig. 1 shows and can how surveying instrument be electrically coupled to each different unit to determine the needed voltage measurement of internal battery resistance of selected unit;
Fig. 2 a and Fig. 2 b show the identical AC ripple voltage component of signal existing in the DC voltage of the test cell that obtains during calibration phase and reference unit;
Fig. 3 shows the circuit of Fig. 1, but having to be connected to is subject to measurement unit two ends to apply the current source of current impulse during enlivening test phase;
Fig. 4 is defined as object with the internal battery resistance to discrete cell, and the system that can use Fig. 3 is measured the voltage at two ends, particular battery unit and the process flow diagram of the various operations carried out;
Fig. 5 shows during enlivening test phase the output voltage waveforms obtaining respectively at test cell and reference unit two ends, and further shows DC voltage ripple component in two kinds of waveforms and how to aim in time; And
Fig. 6 shows the reference voltage and the figure that is subject to the difference in magnitude between the voltage of measurement unit through calibration, and " DC voltage difference " represents to be used to definite high-accuracy voltage of the internal resistance of measurement unit that is subject to and measure.
Embodiment
Now with reference to accompanying drawing, exemplary embodiment is described more fully.
With reference to figure 1, Fig. 1 shows that the internal resistance of the given battery unit of UPS is defined as to object, when carrying out battery unit measurement on UPS12, for reducing or eliminate the system 10 of the impact of ripple voltage.Six single battery unit that are marked as " A " to " F " with the UPS12 in this example shown in the form of Simplification with the DC bus 12a two ends that are connected to UPS.In this example, unit A to F forms a battery unit " string " of UPS12." test " voltage table 16 is used to obtain the voltage measurement at " being subject to measurement unit " (being unit C in this example) two ends.The second voltage table 18 that is called as " reference " voltage table is used to obtain to the voltage at a battery unit (the being cells D in this example) two ends in other battery units in string.
First can carry out calibration phase to determine the ratio rate variance (ratiometric difference) between tested battery unit and reference battery unit.In Fig. 1, for this operative configuration voltage table 16 and voltage table 18.Determine that the ratio rate variance between these two battery units of battery unit C and battery unit D is useful because unit A to the voltage at each two ends, unit in unit F differ establish a capital identical.This is because do not have two battery units to have identical mechanical property and chemical characteristic at battery unit A to battery unit F.In addition, owing to aging, temperature or other factors, battery unit A can have different charged states to battery unit F.The combination of all of these factors taken together often causes battery unit A to the slight difference between the output voltage of battery unit F.Calibration phase is identified in the reference unit of special time and is subject to accurate ratio or the percent difference (than rate variance) between measurement unit.Process flow diagram in connection with Fig. 4 is further described this.
Fig. 2 a and Fig. 2 b provide the example of the voltage waveform that can obtain with voltage table 16 and voltage table 18 during the calibration phase of test.As mentioned above, on DC bus 12a, often there is the AC ripple voltage of less degree.This AC ripple voltage can exert an influence to the precision of the DC voltage measurement of the expectation obtaining for tested battery unit.Fig. 2 a shows and is illustrated in the waveform 20 that is subject to the voltage measurement that measurement unit (unit C) two ends carry out.Fig. 2 b shows the waveform 22 of the voltage measurement of carrying out at reference unit (cells D) two ends.Use respectively voltage table 16 and voltage table 18 to produce in this example the measurement of waveform 20 and 22 simultaneously.Can see, the ripple voltage that superposeed in the two DC voltage of waveform 20 and waveform 22, although the amplitude of the waveform 22 of measuring at reference unit D two ends is larger.
With reference to figure 3, when having carried out calibration operation, then can enliven measuring phases.Enliven measuring phases and comprise use current source 14, this current source 14, for applying enough pulses of large electric current of amplitude, makes to be subject to the cell resistance two ends of measurement unit (being battery unit C in this example) to produce measurable voltage.The test lead of voltage table 16 is placed in to positive terminal and the negative terminal two ends of battery unit C.Voltage table 18 is used to obtain reference voltage, therefore its lead-in wire is connected to positive terminal and the negative terminal of reference unit D.
System 10 utilized any amount of ripple voltage that is present on DC bus by approximately equal be divided into the fact at the two ends of all unit in DC bus 12a, the voltage at battery unit C two ends also will be present in battery unit A to each the battery unit two ends in battery unit F like this.Although AC ripple voltage can have adverse influence to the voltage measurement reading for carried out by measurement unit (unit C), but the method for present disclosure is measured according to the voltage tester carrying out for battery unit C, uses the existence of known AC ripple voltage to help eliminate this adverse influence.
With reference to Fig. 4, in the flow process Figure 100 illustrating, show carrying out the calibration of present disclosure and enlivening in measuring phases, according to the methodology of present disclosure, an example of the sequence of the operation that can carry out.The calibration phase for methodology operate 102 and operation 104.In operation 102, use respectively 18 pairs of voltage table 16 and voltage tables to be subject to the voltage at measurement unit (unit C) two ends and the voltage at reference unit (cells D) two ends to measure (Fig. 3).These are measured the data acquisition instrument of being controlled by for example suitable processor and carry out simultaneously.In operation 104, the measurement obtaining is used for determining the ratio rate variance between test cell and the voltage of reference unit in operation 102.
In operation 106, the activation phase of test starts.Operation 106 comprises (unit C) Injection Current pulse from current source 14 to tested battery unit.In fact, this can be the cathodal current pulse that makes tested unit load.Simultaneously, or substantially simultaneously, as operate 108 indicated, with tested battery cell voltage table 16, obtain the voltage readings at tested battery unit (unit C) two ends, and as indicated in operation 110, with reference voltage table 18, obtain the measurement of the voltage at two ends, reference battery unit (cells D).With reference to figure 5, waveform 24 represents the voltage of tested battery unit (unit C) simply, and waveform 26 represents the voltage of reference unit (cells D).Will be noted that, waveform 24 and waveform 26 these two waveforms are aimed at substantially in time completely.
When having obtained the voltage of two measurements that obtain in operation 108 and operation 110, then, as operate 112 indicatedly, can preserve the voltage of two measurements.In operation 114, the reference voltage of using the ratio rate variance obtaining in operation 102 and operation 104 to revise just to have obtained is " through calibration " reference voltage producing.For example, if larger 15% than the tested cell voltage of rate variance indication reference unit voltage ratio, so, the value of the reference voltages that obtain in operation 110 will be reduced 15% to form the reference voltage through calibration.In operation 116, determine poor through between the reference voltage of calibration and voltage from tested battery unit (unit C) acquisition.This operation comprises using through the reference voltage of calibration and a voltage voltage from tested battery unit (unit C) acquisition and deducts another voltage to obtain poor between the two.Fig. 6 shows through the reference voltage waveform 26a of calibration and the direct current potential difference 28 between test voltage wave 24.The direct current potential difference 28 that obtains can be considered to tested battery unit " through filtering " VDCT volts ,direct-current ,test.Through the VDCT volts ,direct-current ,test of filtering, removed AC ripple voltage component completely.Therefore, through the VDCT volts ,direct-current ,test of filtering, can be used as the high accuracy approximation value of the internal resistance of tested battery unit.In fact, method 100 can 100% or is close to 100% ground AC ripple voltage component is filtered away from the test voltage of carrying out at tested battery unit is measured.If necessary, can adopt known cross-correlation techniques to solve any error causing due to Measuring Time skew slight between reference voltage and test voltage.In addition, can be by alternately exchanging two voltage tables in continuous twice test mutually, and the measurement difference for each unit is averaged, and the trueness error of removing thus any voltage table solves any error that the measuring accuracy due to two voltage tables causes.
Therefore present disclosure can provide and makes it possible to reliably and accurately carry out the definite high precision DC voltage measurement of the internal resistance of cell.The system and method for present disclosure does not rely on the demand to complicated filtering system; The existing data acquisition instrument that can carry out the measurement of needs is easy to obtain.
With explanation and be described as object provide above in description to embodiment.But it is not intended to exhaustive or restriction present disclosure.Even if do not specifically illustrate or describe, but the independent key element of specific embodiment or feature are not limited to this specific embodiment conventionally, but are interchangeable and can be used in selected embodiment at where applicable.Identical mode also can change in many ways.These modification do not think to deviate from present disclosure, and all these changes are all intended to be included in the scope of present disclosure.
It is in order to make present disclosure more thorough and to the scope of those skilled in the art's comprehensive representation present disclosure that exemplary embodiment is provided.In order thoroughly to understand the embodiment of present disclosure, many details have been set forth, for example the example of concrete parts, apparatus and method.For ability, common field technique personnel are apparent that, needn't adopt these details, and exemplifying embodiment embodiment in many different forms, and it should not be interpreted as the restriction to present disclosure scope.In some exemplary embodiments, be not described in detail known method, known apparatus structure and known technology.
Term as used herein is only for the object of describing concrete exemplary embodiment, and is not intended to limit." one (a) " of singulative, " one (an) " and " described (the) " as used in this article, unless context clearly point out in addition, can be regarded as and also comprise plural form.Term " comprises (comprises, comprising, including) " and " having (having) " comprising property, and show thus to have described feature, integer, step, operation, key element and/or parts, but do not get rid of, do not exist or additional one or more further feature, integer, step, operation, key element, parts and/or its combination.Unless indicate especially execution sequence, otherwise method step described herein, process and operation should not be construed as and must require them to carry out with the concrete order discussing or illustrate.Should also be understood that and can adopt additional or substituting step
When key element or layer are called as " top (on) " or " being bonded to (engaged to) ", " being connected to (connected to) " or " being coupled to (coupled to) " another key element or when layer at another key element or layer, can be directly above other key elements or layer or be directly bonded to, be connected to or be coupled to other key elements or layer, or also can there is intermediate elements or middle layer.In contrast, when key element is called as " directly top (directly on) " or " being directly bonded to (directly engaged to) " at another key element or layer, is connected directly to (directly connected to) ", when " being directly coupled to (directly coupled to) " another key element or layer, can not there is not intermediate elements or middle layer.Other vocabulary that are used for describing the relation between key element should be explained in a similar fashion (for example, " and ... between (between) " with " and directly exist ... between (directly between) ", " adjacent (adjacent) " and " direct neighbor (directly adjacent) " etc.).Term "and/or" comprises any and all combinations of one or more project in the project of listing being associated as used in this article.
Although can describe various key elements, parts, region, layer and/or part by term first, second, third, etc. in this article, these key elements, parts, region, layer and/or part should not limited by these terms.These terms can be only for distinguishing a key element, parts, region, layer or part and another region, layer or part.Unless clearly point out in context, otherwise while using in this article, as the term of " first ", " second " and other digital terms does not imply order or order.Therefore,, in the situation that do not deviate from the teaching of exemplary embodiment, the first element discussed below, first component, first area, ground floor or first can be known as the second key element, second component, second area, the second layer or second portion.
Can use in this article the term with space correlation, such as " inner (inner) ", " outside (outer) ", " below (beneath) ", " below (below) ", " lower (lower) ", " top (above) ", " higher (upper) " etc., so that describe key element as shown in the figure or the relation of feature and another key element or feature.Except the direction of describing in figure, from the term of space correlation can be intended to comprise use or operation in the different direction of device.For example, if the device in figure is reversed, the key element that is described as be in so " below (below or the beneath) " of other key elements or feature will be positioned at " top (above) " of other key elements or feature.Like this, the direction that exemplary term " below (below) " can comprise and under direction the two.Device also can also can correspondingly be explained like this in other directions (90-degree rotation or in other directions) and the description of used herein and space correlation.
Claims (16)
1. at least substantially reducing the method for ripple voltage on the impact of the battery testing measurement of the battery unit of the coupled in series of formation direct current DC bus, described method comprises:
Carry out calibration operation to obtain the ratio rate variance between the first battery unit of described DC bus and the second battery unit of described DC bus, wherein, described the first battery unit and described the second battery unit are connected in series and have different characteristics, and described different characteristic causes the difference of described the first battery unit and described the second battery unit output voltage separately;
To described the first battery unit, apply current signal and at least substantially measure the voltage at described the first battery unit two ends and the voltage at described the second battery unit two ends simultaneously;
With determined, describedly than rate variance, be modified in the voltage measurement that carry out at described the second battery unit two ends, to generate the modified voltage measurement of described the second battery unit; And
With the described voltage at measured described the first battery unit two ends and the described modified voltage measurement at described the second battery unit two ends, determine poor between the two, the described poor VDCT volts ,direct-current ,test through filtering that represents substantially therefrom to have removed all described ripple voltages.
2. method according to claim 1, wherein, obtains and describedly than rate variance, comprises:
Obtain first voltage measurement at the described first battery unit two ends of described DC bus, described the first battery unit forms tested battery unit; And
The second voltage at the second battery unit two ends that are connected in series with described the first battery unit that at least substantially simultaneously obtain described DC bus is measured, and described the second battery unit forms reference battery unit testing.
3. method according to claim 2, wherein, obtain and describedly than rate variance, also comprise with the first voltage tester at least substantially obtaining simultaneously and measuring and second voltage thermometrically determines that the output voltage amplitude between described the first battery unit and described the second battery unit is poor, describedly than rate variance, represent the difference owing to described first battery unit of mechanical property or chemical characteristic and the output voltage of described the second battery unit.
4. method according to claim 1, wherein, described use is determined to be describedly modified in the described voltage measurement carried out at described the second battery unit two ends and to comprise one of following to generate the modified voltage measurement of described the second battery unit than rate variance: be added in the described voltage measurement of carrying out at described the second battery unit two ends to generate described modified voltage measurement, or deduct to generate described modified voltage measurement from the described voltage measurement of carrying out at described the second battery unit two ends.
5. method according to claim 1, wherein, the described voltage at described the first battery unit two ends that described use is measured and the described modified voltage measurement at described the second battery unit two ends are determined that the operation of the difference between the two relates to from the described voltage at measured described the first battery unit two ends and are deducted described modified voltage measurement, or from described modified voltage measurement, deduct the described voltage at measured described the first battery unit two ends.
6. at least substantially reducing the method for ripple voltage on the impact of the battery testing measurement of the battery unit of the coupled in series of formation direct current DC bus, described method comprises:
By following step, carry out calibration operation:
Obtain first voltage measurement at the first battery unit two ends of described DC bus, described the first battery unit forms tested battery unit;
The second voltage at the second battery unit two ends that are connected in series with described the first battery unit that at least substantially simultaneously obtain described DC bus is measured, and described the second battery unit forms reference battery unit;
With the first voltage tester, measure and second voltage thermometrically is determined the ratio rate variance between described the first battery unit and described the second battery unit, describedly than rate variance, represent owing to described the first battery unit one of at least in the mechanical property of described the first battery unit and described the second battery unit and chemical characteristic and the difference between the output of described the second battery unit;
With at described the first battery unit two ends, measure described voltage at least substantially side by side, to described the first battery unit, apply current signal and measure the voltage at described the first battery unit two ends and the voltage at described the second battery unit two ends;
With determined, describedly than rate variance, be modified in the voltage measurement that carry out at described the second battery unit two ends, to generate the modified voltage measurement of described the second battery unit; And
With the described voltage at measured described the first battery unit two ends and the described modified voltage measurement at described the second battery unit two ends, determine poor between the two, the described poor VDCT volts ,direct-current ,test through filtering that represents substantially therefrom to have removed all described ripple voltages.
7. method according to claim 6, wherein, described use is described to be revised voltage measurement that described the second battery unit is carried out and comprises one of following to obtain the operation of the modified voltage measurement at described the second battery unit two ends than rate variance: to the described voltage measurement of carrying out at described the second battery unit two ends, to add or deduct according to the described magnitude of voltage than rate variance, to generate described modified voltage measurement.
8. method according to claim 6, wherein, the described voltage at described the first battery unit two ends that described use is measured and the described modified voltage measurement at described the second battery unit two ends determine that the operation of the difference between the two relates to: from the described voltage at measured described the first battery unit two ends, deduct described modified voltage measurement, or from described modified voltage measurement, deduct the described voltage at measured described the first battery unit two ends.
9. method according to claim 8, also comprises and uses processor to help obtain the measured described voltage at described the first battery unit two ends and the described voltage measurement of described the second battery unit.
10. method according to claim 6, wherein, described in apply current signal and comprise: to described the first battery unit, apply current impulse.
11. methods according to claim 6, wherein, by obtaining first voltage measurement at the first battery unit two ends of described DC bus and the second voltage measurement at the second battery unit two ends that are connected in series with described the first battery unit that obtain described DC bus, carry out calibration operation and comprise: obtain the first battery voltage measurement and the second battery voltage measurement simultaneously, wherein said the first battery unit forms tested battery unit, and described the second battery unit forms reference battery unit.
12. methods according to claim 6, wherein, describedly to described the first battery unit, apply current signal and measure the voltage at described the first battery unit two ends and the voltage at described the second battery unit two ends comprises: the voltage to described the first battery unit two ends and described the second battery unit two ends is measured simultaneously.
13. 1 kinds at least substantially reducing the system of ripple voltage on the impact that forms the battery testing of battery unit of the coupled in series of direct current DC bus and measure, and described system comprises:
The data-acquisition system that processor is controlled, the data-acquisition system that described processor is controlled has at least one voltage table, and the data-acquisition system that described processor is controlled is configured to:
Obtain first voltage measurement at the first battery unit two ends of described DC bus, described the first battery unit forms tested battery unit;
The second voltage at the second battery unit two ends that are connected in series with described the first battery unit that at least substantially simultaneously obtain described DC bus is measured, and described the second battery unit forms reference battery unit;
In calibration operation, with the first voltage tester, measure and second voltage thermometrically is determined the ratio rate variance between described the first battery unit and described the second battery unit, describedly than rate variance, represent owing to described the first battery unit one of at least in mechanical property and chemical characteristic and the difference between the output of described the second battery unit; And
Current source, described current source is for to described the first battery unit Injection Current signal and measure the voltage at described the first battery unit two ends with described at least one voltage table, and with at the described voltage of described the first battery unit two ends measurement, at least substantially side by side measure the voltage at described the second battery unit two ends;
Described data acquisition subsystem is also configured to:
With determined, describedly than rate variance, be modified in the voltage measurement that carry out at described the second battery unit two ends, to generate the modified voltage measurement of described the second battery unit; And
With the described voltage at measured described the first battery unit two ends and the described modified voltage measurement at described the second battery unit two ends, determine poor between the two, the described poor VDCT volts ,direct-current ,test through filtering that represents substantially therefrom to have removed all described ripple voltages.
14. systems according to claim 13, wherein, by one of following obtain determined described than rate variance to generate described modified voltage measurement: be added in the voltage measurement of carrying out at described the second battery unit two ends, or deduct the voltage measurement of carrying out from described the second battery unit two ends.
15. systems according to claim 13, wherein, described calibration comprises and obtains the first battery voltage measurement and the second battery voltage measurement simultaneously.
16. systems according to claim 13, wherein, described current source comprises the current source being configured to described the first battery unit Injection Current pulse.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US201361781393P | 2013-03-14 | 2013-03-14 | |
| US61/781,393 | 2013-03-14 | ||
| US14/191,701 US9268000B2 (en) | 2013-03-14 | 2014-02-27 | System and method for improved accuracy in battery resistance measurement systems |
| US14/191,701 | 2014-02-27 |
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| CN104049148A true CN104049148A (en) | 2014-09-17 |
| CN104049148B CN104049148B (en) | 2017-06-06 |
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| CN201410093628.0A Active CN104049148B (en) | 2013-03-14 | 2014-03-13 | For the system and method for the improved precision of cell resistance measuring system |
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| GB (1) | GB2514218B (en) |
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Also Published As
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| GB2514218A (en) | 2014-11-19 |
| GB2514218B (en) | 2016-07-06 |
| GB201404018D0 (en) | 2014-04-23 |
| CN104049148B (en) | 2017-06-06 |
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