CN105954592A - Power battery pack internal resistance measurement system - Google Patents
Power battery pack internal resistance measurement system Download PDFInfo
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- CN105954592A CN105954592A CN201610571445.4A CN201610571445A CN105954592A CN 105954592 A CN105954592 A CN 105954592A CN 201610571445 A CN201610571445 A CN 201610571445A CN 105954592 A CN105954592 A CN 105954592A
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- signal
- internal resistance
- communication
- frequency signal
- resistance measurement
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/08—Measuring resistance by measuring both voltage and current
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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
Abstract
The invention provides a power battery pack internal resistance measurement system, which comprises a measurement loop and an internal resistance measurement unit. The measurement loop comprises a battery pack to be measured. The internal resistance measurement unit is used for measuring the voltage frequency signal and current frequency signal of the battery pack to be measured, and carrying out calculation based on the voltage frequency signal and the current frequency signal to obtain AC internal resistance of the battery pack to be measured. The power battery pack internal resistance measurement system can realize measurement and calculation of the internal resistance of the battery pack, and provides reference basis for knowing state information and work condition of the battery pack in real time.
Description
Technical field
The present invention relates to internal resistance measurement technical field, in particular to a kind of power battery pack internal resistance
Measurement system.
Background technology
At present, in power battery pack application, as new forms of energy car, hybrid electric vehicle, electric train,
Electric bicycles etc., and oceanographic equipment and underawater ordnance equal energy source field, be required to by all kinds
Battery constitute energy storage unit；During electrokinetic cell uses, for ease of to battery system
Management, it is to be understood that the internal resistance of cell, in order to understand status information and the working condition of set of cells in time,
For keeping the good state that is in of battery to be operated state and provide safeguard；But in prior art
A kind of device or system that can effectively carry out set of cells internal resistance measurement does not also occur.
Summary of the invention
In view of this, the purpose of the embodiment of the present invention is to provide a kind of power battery pack internal resistance measurement system
System, to solve the problems referred to above.
First, first aspect, embodiments provide a kind of power battery pack internal resistance measurement system,
Including:
Measure loop and internal resistance measurement unit；
Described measurement loop includes mesuring battary group；
Described internal resistance measurement unit is for measuring voltage-frequency signal and the electric current of described mesuring battary group
Frequency signal, and according to described voltage-frequency signal and described current frequency signal be calculated described in treat
Survey the AC internal Resistance of set of cells.
In conjunction with first aspect, embodiments provide the first possible reality of above-mentioned first aspect
Existing mode, wherein:
Described system also includes: battery monitor unit, for the electricity of battery cell in described set of cells
Pressure and temperature are monitored.
In conjunction with first aspect, embodiments provide the reality that the second of above-mentioned first aspect is possible
Existing mode, wherein:
Described system, also includes: internal communication unit；
Described internal communication unit is used for realizing described battery monitor unit and described internal resistance measurement unit
Between internal communication.
In conjunction with first aspect, embodiments provide the third possible reality of above-mentioned first aspect
Existing mode, wherein:
Described internal resistance measurement unit includes: front end circuit, wave filter and amplifier；
Described front end circuit, described wave filter, described amplifier cooperate to extract described measurement and return
The voltage-frequency signal of road set of cells and current frequency signal, and compression noise signal.
In conjunction with first aspect, embodiments provide the 4th kind of possible reality of above-mentioned first aspect
Existing mode, wherein:
Described internal resistance measurement unit also includes: first processor, described first processor and described driving
Amplifier is connected；
Described first processor controls to carry out described voltage-frequency signal and described current frequency signal
Sampling, calculating, and it is calculated described according to described voltage-frequency signal and described current frequency signal
The AC internal Resistance of mesuring battary group.
In conjunction with first aspect, embodiments provide the 5th kind of possible reality of above-mentioned first aspect
Existing mode, wherein:
Described front end circuit includes: signal coupler；
Described first processor sends resistance measuring signals, and described resistance measuring signals is through described driving
Amplifier carries out signal amplification, and the resistance measuring signals after signal amplifies is transferred into signal coupling
Clutch, and it is transferred to described measurement loop by signal coupler.
In conjunction with first aspect, embodiments provide the 6th kind of possible reality of above-mentioned first aspect
Existing mode, wherein:
Described internal communication unit includes: Communication processing circuit；
The communication signal of transmission is carried out digit synthesis by processor by described internal communication unit, generates
After respective frequencies signal, by all frequency signal superpositions, after being amplified by driving amplifier, pass through
Superposition frequency signal is sent to measure loop by signal coupler, it is achieved the transmission of communication signal；
Described internal communication unit is by signal coupler, front end circuit, wave filter and amplifier respectively
Extract different frequency communication signal, then by Communication processing circuit, frequency signal is transformed to serial digital
Signal or parallel digital signal, then received this digital signal by another processor, it is achieved communication signal
Reception；Or the output signal of amplifier is directly gathered by another processor, logical by calculating
News signal, it is achieved communication signal receives.
In conjunction with first aspect, embodiments provide the 7th kind of possible reality of above-mentioned first aspect
Existing mode, wherein:
Described first processor is also connected with isolation communication element, and described first processor is by described
Isolation communication element carries out communication with described system peripherals and is connected.
In conjunction with first aspect, embodiments provide the 8th kind of possible reality of above-mentioned first aspect
Existing mode, wherein:
Described isolation communication element includes: CAN/485 communication interface.
In conjunction with first aspect, embodiments provide the 9th kind of possible reality of above-mentioned first aspect
Existing mode, wherein:
Described measurement loop also includes:
First electric capacity, the first inductance, the second electric capacity and the second inductance, described first electric capacity and the first electricity
Feel the branch circuit parallel connection after the branch road after series connection and the second electric capacity and the series connection of the second inductance, described second electric capacity
It is additionally provided with switch with on the branch road after the second inductance series connection；In the most described measurement loop is used for realizing
Resistance is measured and internal communication；
Or,
Described measurement loop also includes: inductance, electric capacity and the series circuit of switch composition, now leads to
Cross the electrical equipment communication at the series circuit two ends being connected in parallel on described inductance, electric capacity and switch composition.
A kind of power battery pack internal resistance measurement system provided in the embodiment of the present invention, passes through measuring unit
Measure voltage-frequency signal and the current frequency signal of mesuring battary group, and according to this voltage-frequency signal
Carrying out being calculated the AC resistance of mesuring battary group with current frequency signal, the embodiment of the present invention can
Realize the measurement to set of cells internal resistance and calculating, for understanding status information and the work shape of set of cells in time
Condition provides reference frame.
For making the above-mentioned purpose of the present invention, feature and advantage to become apparent, preferable reality cited below particularly
Execute example, and coordinate appended accompanying drawing, be described in detail below.
Accompanying drawing explanation
In order to be illustrated more clearly that the technical scheme of the embodiment of the present invention, below will be to required in embodiment
Accompanying drawing to be used is briefly described, it will be appreciated that the following drawings illustrate only some of the present invention
Embodiment, is therefore not construed as the restriction to scope, for those of ordinary skill in the art,
On the premise of not paying creative work, it is also possible to obtain other relevant accompanying drawings according to these accompanying drawings.
Fig. 1 shows a kind of power battery pack internal resistance measurement system that the embodiment of the present invention one provided
Structural representation；
Fig. 2 shows a kind of power battery pack internal resistance measurement system that the embodiment of the present invention two provided
Structural representation；
Fig. 3 shows a kind of power battery pack internal resistance measurement system that the embodiment of the present invention three provided
Structural representation.
Fig. 4 shows a kind of power battery pack internal resistance measurement system that the embodiment of the present invention four provided
Structural representation；
Fig. 5 shows a kind of power battery pack internal resistance measurement system that the embodiment of the present invention five provided
Structural representation.
Illustrate:
110-measures loop；120-internal resistance measurement unit；130-internal communication unit；140, battery prison
Survey unit；
100-mesuring battary group；101-the first electric capacity；102-the first inductance；103-the second electric capacity；104-
Second inductance；107-electric capacity；108-inductance；105-switchs；207-first processor；307-second
Processor；201-the first signal coupler；202-secondary signal bonder；203-communication receives coupling
Coil；204-internal resistance measurement receives coupling coil；301-the 3rd signal coupler；302-the 4th signal
Bonder；209-isolates communication element.
Detailed description of the invention
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearer, below in conjunction with this
Accompanying drawing in inventive embodiments, is clearly and completely described the technical scheme in the embodiment of the present invention,
Obviously, described embodiment is only a part of embodiment of the present invention rather than whole embodiments.
Generally herein described in accompanying drawing and the assembly of the embodiment of the present invention that illustrates can be with various different joining
Put and arrange and design.Therefore, retouching in detail the embodiments of the invention provided in the accompanying drawings below
State the scope being not intended to limit claimed invention, but be merely representative of the selected reality of the present invention
Execute example.Based on embodiments of the invention, those skilled in the art are not before making creative work
Put the every other embodiment obtained, broadly fall into the scope of protection of the invention.
At present, in the application process of power battery pack, for ease of battery system being managed and monitoring,
It should be understood that the internal resistance of cell, in order to understand status information and the working condition of set of cells in time；Because
This, a kind of power battery pack internal resistance measurement system provided in the embodiment of the present invention is to solve the problems referred to above.
Embodiment as shown in Figure 1, provides a kind of power battery pack internal resistance measurement system in the present embodiment
System, including:
Measure loop 110 and internal resistance measurement unit 120；
Above-mentioned measurement loop 110 includes mesuring battary group；
Above-mentioned internal resistance measurement unit 120 is for measuring voltage-frequency signal and the electricity of above-mentioned mesuring battary group
Stream frequency signal, and it is calculated mesuring battary group according to this voltage-frequency signal and current frequency signal
AC internal Resistance.
A kind of power battery pack internal resistance measurement system in the present embodiment, it is possible to realize set of cells internal resistance
Measure, provide foundation for understanding the use status information of power battery pack.
In reality, weigh set of cells duty have two key factors one be temperature another be
Voltage；Therefore, embodiment as shown in Figure 2, a kind of power battery pack provided in the present embodiment
Internal resistance measurement system, also includes: battery monitor unit 140, internal communication unit 130, battery detection
Unit 140 is used for being monitored voltage and the temperature of battery cell in set of cells, this internal communication list
Unit 130 leads to for realizing the inside between intrasystem battery monitor unit 140 and internal resistance measurement unit
News.
It should be noted that the embodiment of accompanying drawing 2 has been diagrammatically only by out one of them battery monitor unit
140 with internal resistance measurement unit, internal communication unit, measure the connection status in loop, in actual application also
It is not limited to this.
Embodiment as shown in Figure 3, a kind of power battery pack internal resistance measurement system provided in the present embodiment
In system, including measuring loop, internal resistance measurement unit, battery monitor unit and internal communication unit, survey
Amount loop includes mesuring battary group, and internal resistance measurement unit is for measuring the electric voltage frequency letter of mesuring battary group
Number and current frequency signal, and be calculated to be measured according to this voltage-frequency signal and current frequency signal
The AC internal Resistance of set of cells, internal communication unit is for realizing the internal communication of whole system.
Above-mentioned internal resistance measurement unit includes: front end circuit, wave filter and amplifier；Front end circuit, filter
Ripple device, amplifier cooperate to extract the voltage-frequency signal and power frequency measuring loop set of cells
Signal, and compression noise signal.
Above-mentioned internal resistance measurement unit also includes: first processor；This first processor controls voltage frequency
Rate signal and current frequency signal carry out sampling, calculating, and according to voltage-frequency signal and power frequency
Signal is calculated the AC internal Resistance of mesuring battary group；First processor is also associated with driving amplifier；
This driving amplifier is for carrying out signal processing and amplifying to the output signal of first processor.
Above-mentioned front end circuit includes: signal coupler；This signal coupler is connected with measuring loop,
First processor sends resistance measuring signals, and resistance measuring signals carries out signal through overdriven amplifier and puts
Greatly, the resistance measuring signals after signal amplifies is transferred into signal coupler, and by signal coupling
Clutch transmission (or perhaps coupling) is to measuring loop.
Further, as it is shown on figure 3, in the present embodiment as a example by being provided with a battery monitor unit
Illustrating, wherein internal resistance measurement unit includes: first processor 207, and battery monitor unit includes:
Second processes 307；The quantity that it should be noted that internal battery pack battery cell is multiple, therefore actual
During application, the quantity of battery monitor unit is it can also be provided that multiple, and this embodiment is only with a battery prison
The introduction of internal communication between battery monitor unit and internal resistance measurement unit is carried out as a example by surveying unit.
Further, measure loop to include: mesuring battary group the 100, first electric capacity the 101, first inductance
102, after the second electric capacity 103 and the second inductance 104, the first electric capacity 101 and the series connection of the first inductance 102
Branch road and the second electric capacity 103 and the second inductance 104 series connection after branch circuit parallel connection, the second electric capacity 103
It is additionally provided with switch 105 with on the branch road after the second inductance 104 series connection；Further, this measurement loop
In be also associated with multiple signal coupler；Need when carrying out internal resistance measurement to close switch 105.
For ease of being described in detail, above-mentioned multiple bonders are divided into: the first signal coupler 201,
Secondary signal bonder the 202, the 3rd signal coupler 301 and the 4th signal coupler 302；Need
Bright, the most by way of example only, this programme reality realize during, signal coupler
Quantity is not limited thereto, and the most above-mentioned dividing mode is not to be regarded as being the limit to technical scheme
Fixed.
Above-mentioned set of cells internal resistance is measured during, first, first processor 207 sends resistance
Measuring signal, this resistance measuring signals carries out signal amplification through overdriven amplifier, amplifies through signal
Resistance measuring signals after process drives the first signal coupler 201, and through this first signal coupler
201 couple a signal to measure loop；The preamplifier being connected with mesuring battary group 100 and
The preamplifier that binary signal bonder 202 is connected carries out preposition process to signal respectively, then distinguishes
Through respective wave filter, amplifier process after, finally respectively obtain voltage-frequency signal and electric current
Frequency signal.
Above-mentioned signal coupler can use traditional signal coupler when actually used, it is also possible to
Use includes the signal of two versions between open stich, and open stich by snapping connection
Bonder, further, it is possible to use the signal coupler being made by soft magnetic materials, at this not
It is repeated here；Preferably, use working signal frequency at 500 hertz-50 megahertzs in the present embodiment
Between signal coupler.
In above-mentioned measurement loop, conductor impedance value is fixed value, the size of current frequency signal and battery
The relation of internal resistance meets below equation:
In above formula, R is the AC internal Resistance of set of cells, and U is alternating voltage, I alternating current, and RL is line
Roadlock resists,For series resonant impedance；
When alternating voltage U mono-timing, current frequency signal becomes with the impedance loop in loop, set of cells place
Proportionate relationship, accurately measures accordingly it is also possible to use above-mentioned formula to realize the AC internal Resistance of set of cells.
A kind of power battery pack internal resistance measurement system provided in above-described embodiment, uses price relatively
Low front end circuit, wave filter and amplifier realizes the extraction of voltage-frequency signal and current frequency signal,
And then realize the measurement of set of cells internal resistance；Have signal extraction quickly, measure accurately and low cost long-pending
Pole effect.
It should be noted that the battery described in the present embodiment refers to energy poke equipment, including plumbic acid
Battery, lithium battery, super capacitor and other kinds of energy storage equipment.
Above-mentioned middle internal resistance measurement system is not only applicable to the measurement of power battery pack internal resistance, it is also possible to should
For as electric capacity etc., other have the internal resistance measurement of the electricity components and parts of resistance, therefore present techniques side
Case all should contain in protection scope of the present invention in the application of other same or like technical fields
Within.
When being provided with multiple battery monitor unit, need to meet each battery monitor unit and survey with internal resistance
Communication can be carried out between amount unit, but in existing battery set management branch measurement system, its
Internal communication is all that the CAN using isolation carries out communication, and CAN must be used in this kind of mode total
Line connects voltage and the temperature measurement equipment of each battery cell, often causes measurement lead-in wire long,
Bus is too much, and circuit is too fat to move, connects up the defects such as loaded down with trivial details, affects reliability and the terseness of system.
A kind of set of cells internal resistance measurement system provided in the embodiment of the present invention can use and utilize power
Set of cells is measured loop itself and is realized communication transfer as conductor, and i.e. the measurement loop in the present embodiment can
To be both used for carrying out set of cells internal resistance measurement, it is also possible to be used for the inside realizing between system inner treater
Communication, it macroscopically can be regarded as the transmission that carried out by a wire；
Above-mentioned internal communication unit includes: Communication processing circuit；
During carrying out communication, as a example by first processor to the communication of the second processor, internal
The communication signal of transmission is carried out digit synthesis by first processor 207 by communication unit, generates correspondence
After frequency signal, by all frequency signal superpositions, after being amplified by driving amplifier, through the first letter
Superposition frequency signal is sent to measure loop by number bonder 201, it is achieved the transmission of communication signal；
Internal communication unit is divided by the 4th signal coupler 302, front end circuit, wave filter and amplifier
Take different frequency communication signal indescribably, then by Communication processing circuit, frequency signal is transformed to serial number
Word signal or parallel digital signal, then received this digital signal by the second processor 307, it is achieved logical
The reception of news signal；Or directly gathered the output signal of amplifier by the second processor, by calculating
Draw communication signal, it is achieved communication signal receives.
Further as a example by two-way communication signal, scheme is described below:
As a example by first processor 207, first, first processor 207 sends communication frequency signal f1
With frequency signal f2To driving amplifier, carried out communication frequency signal f by driving amplifier equally1With
Frequency signal f2Carry out signal processing and amplifying, driving amplifier will amplify after communication frequency signal f1With
Frequency signal f2It is sent to the first signal coupler 201, this first signal coupler 201 further will
This signal coupled to measure in loop, and now measurement loop is i.e. as order circuit, with the 4th signal coupling
The preamplifier that clutch 302 is connected carries out preposition process to this signal, be then passed through wave filter,
Amplifier respectively obtains frequency signal f after carrying out processing1With frequency signal f2, now the second processor
307 pass through analog-digital converter to this frequency signal f1With frequency signal f2Sample, obtain numeral frequency
Rate signal f1With digital fre-quency signal f2, continuous signal become digital signal, further, also
Can be by Communication processing circuit by digital fre-quency signal f1With digital fre-quency signal f2Generate serial digital
Signal or parallel digital signal are sent to the second processor, or before directly being gathered by the second processor
Put the output signal of amplifier, by calculating communication signal, it is achieved communication signal receives, and then
Realize the digital communication between first processor and the second processor.
Only it is illustrated with frequency signal f1 and frequency signal f2 it should be noted that above-mentioned,
But when reality is applied, it is not limited to only frequency signal f1 and frequency signal f2, can be multichannel
Frequency signal；And if when processor uses multifrequency signal to send, mailing address now can be omitted
Reason circuit, is calculated multifrequency signal by processor collection, draws the communication signal of correspondence；Therefore
Content in above-described embodiment is not to be taken as the restriction of technical scheme content.
All can carry out mutual communication between above-mentioned each processor, the such as second processor can also send
Communication frequency signal f1With frequency signal f2, carry out from the second processor to the number in first processor direction
Word communication.
Battery monitor unit in above-described embodiment, for the battery cell of set of cells is carried out voltage and/
Or the measurement of temperature, carry out voltage measurement and can meet the voltage carrying out in set of cells between battery cell
Balanced management, such as, can be carried out in the following manner: calculates the average voltage of battery cell, for
The battery cell exceeding average voltage certain value carries out conductive discharge, until this battery cell voltage drops to
Off resistance electric discharge after setting, to realize battery voltage balanced management.
Further, the battery balanced management of above-mentioned battery management unit can also be accomplished by:
LTC8403, LTC8404, AD7280 etc. chip is used to realize.
Above-mentioned carrying out the temperature survey to battery cell, the safety during can using battery is entered
Row effective monitoring, can point out when temperature exceedes early warning value, prevents battery from crossing because of temperature and exceeds
The phenomenons such as existing self-firing and self-explosion.
Embodiment four as shown in Figure 4, the measurement loop in the present embodiment includes: inductance 108, electric capacity
107 and the series circuit of switch composition, this measurement loop for carrying out the measurement of set of cells internal resistance, this
Time in parallel the electrical equipment at series circuit two ends at described inductance, electric capacity and switch composition carry out
Communication, i.e. utilization comprise switch, inductance and electric capacity and realize set of cells internal resistance in the measurement loop of interior composition
Measure；Utilize to comprise and be supported on the order circuit of interior composition and realize the internal communication of whole system.
Example five as shown in Figure 5, on the basis of embodiment four, for distinguishing internal resistance measurement and communication,
The coil of secondary signal bonder is divided into internal resistance measurement receive coupling coil 204 and communication receives coupling
Coil 203, then connects the loops such as preamplifier, it is achieved set of cells internal resistance measurement and internal communication.
In above-described embodiment three, in communication process, utilize the first electric capacity, the first inductance, the second electricity
Hold the measurement loop constituted with the second inductance as order circuit；In embodiment four, five, for ease of
System is more succinct, omits the first electric capacity, the first inductance, the second electricity when having only to carry out internal communication
Hold and the second inductance, and use and be connected in parallel on the load at inductance and two ends, capacitances in series loop (such as electromotor
Deng electrical equipment) order circuit that constitutes, make communication system more succinct.
It addition, first processor above-mentioned in the application scheme, the second processor and peripheral circuit thereof are equal
Can realize by the way of integrated chip.
In a kind of power battery pack internal resistance measurement system provided in the embodiment of the present invention, except can be real
Beyond now the internal resistance of cell being measured, also have the advantage that
1, battery cell voltage balance management and the security monitoring management of set of cells in set of cells is realized.
2, utilize electrokinetic cell itself as conductor realize communication (or perhaps utilize measure loop conduct
Order circuit), i.e. solve isolating problem, turn avoid the use of CAN, make measurement and communication
Circuit is greatly decreased, and circuit is clean and tidy；
3, wiring is simple, and the workload of later maintenance and maintenance is little, reduces cost；
4, the reliability of power battery pack internal resistance measurement system is greatly improved.
Further, the first processor in above-described embodiment is also connected with isolation communication element 209,
Processor carries out communication by this isolation communication element 209 with native system external equipment and is connected.
The data that second processor collects can be sent to first processor by internal communication unit,
Further it is sent to system peripherals by first processor by isolation communication element, the most upper
The equipment such as machine.
In a certain specific embodiment, it is preferable that above-mentioned isolation communication element includes: CAN/485 communication
Interface.
It should be noted that the scheme of the application only illustrates how to realize set of cells internal resistance measurement, with
And realize the structure of the internal communication of set of cells internal resistance measurement system and realize battery on this architecture basics
Internal resistance measurement and the method for internal communication, for the adjustment carried out on this basis, as increased multistage filter
Ripple device, increase protection circuit or other accessory circuits etc., to realize better performance and function, or
Based on person utilizes these calculating data invented, the later stage carrying out computational methods processes, it is achieved set of cells
Dump energy, it is allowed to the scheme that the parameter such as charge-discharge electric power, residual life calculates, all at this protection model
In enclosing.
It addition, the means of communication that the internal communication unit of the present invention is used are applicable to frequency modulation modulation (FSK)
Communication mode, it would however also be possible to employ phase modulation (PSK) mode realizes communication, or multi-carrier frequency communication side
Formula (FDM), quadrature multi-carrier communication modes (OFDM), the communication modulation methods of amplification on this basis
Formula, and corresponding circuit is all in scope.
It should be noted that in the description of inventive embodiments, term " first ", " second ", "
Three ", " the 4th " be only used for describe purpose, and it is not intended that instruction or hint relative importance.
It addition, in the description of the embodiment of the present invention, unless otherwise clearly defined and limited, term
" be connected ", " connection " should be interpreted broadly, for example, it may be electrical connection, can be to be joined directly together,
Can also be indirectly connected to by intermediary, can be the connection of two element internals.For this area
Those of ordinary skill for, can with concrete condition understand above-mentioned term concrete meaning in the present invention.
If the function that described system realizes realizes and as independent product using the form of SFU software functional unit
When product are sold or use, can be stored in a computer read/write memory medium.Based on such
Understand, part that prior art is contributed by technical scheme the most in other words or should
The part of technical scheme can embody with the form of software product, and this computer software product stores
In a storage medium, including some instructions with so that embedded computer equipment (can also be
Computer, server, or the network equipment etc.) perform the complete of method described in each embodiment of the present invention
Portion or part steps.And aforesaid storage medium includes: USB flash disk, portable hard drive, read only memory (ROM,
Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic
The various medium that can store program code such as dish or CD.
The above, the only detailed description of the invention of the present invention, but protection scope of the present invention not office
Being limited to this, any those familiar with the art, can in the technical scope that the invention discloses
Readily occur in change or replace, all should contain within protection scope of the present invention.Therefore, the present invention
Protection domain should be as the criterion with described scope of the claims.
Claims (10)
1. a power battery pack internal resistance measurement system, it is characterised in that including: measure loop and interior
Resistance measuring unit；
Described measurement loop includes mesuring battary group；
Described internal resistance measurement unit is for measuring voltage-frequency signal and the electric current frequency of described mesuring battary group
Rate signal, and it is calculated described to be measured according to described voltage-frequency signal and described current frequency signal
The AC internal Resistance of set of cells.
Power battery pack internal resistance measurement system the most according to claim 1, it is characterised in that also
Including: battery monitor unit, for voltage and the temperature of battery cell in described set of cells are supervised
Survey.
Power battery pack internal resistance measurement system the most according to claim 2, it is characterised in that
Also include: internal communication unit；
Described internal communication unit be used for realizing described battery monitor unit and described internal resistance measurement unit it
Between internal communication.
Power battery pack internal resistance measurement system the most according to claim 3, it is characterised in that institute
State internal resistance measurement unit to include: front end circuit, wave filter and amplifier；
Described front end circuit, described wave filter, described amplifier cooperate to extract described measurement and return
The voltage-frequency signal of road set of cells and current frequency signal, and compression noise signal.
Power battery pack internal resistance measurement system the most according to claim 4, it is characterised in that institute
State internal resistance measurement unit also to include: first processor, described first processor and described driving amplifier
It is connected；
Described first processor controls to adopt described voltage-frequency signal and described current frequency signal
Sample, calculating, and according to described voltage-frequency signal and described current frequency signal be calculated described in treat
Survey the AC internal Resistance of set of cells.
Power battery pack internal resistance measurement system the most according to claim 5, it is characterised in that institute
State front end circuit to include: signal coupler；
Described first processor sends resistance measuring signals, and described resistance measuring signals is through described driving
Amplifier carries out signal amplification, and the resistance measuring signals after signal amplifies is transferred into signal coupling
Clutch, and it is transferred to described measurement loop by signal coupler.
7. want the power battery pack internal resistance measurement system described in 6 according to right, it is characterised in that described
Internal communication unit includes: Communication processing circuit；
The communication signal of transmission is carried out digit synthesis by processor by described internal communication unit, generates
After respective frequencies signal, by all frequency signal superpositions, after being amplified by driving amplifier, Jing Guoxin
Superposition frequency signal is sent to measure loop by number bonder, it is achieved the transmission of communication signal；
Described internal communication unit is by described signal coupler, front end circuit, wave filter and amplifier
Extract different frequency communication signal respectively, then by Communication processing circuit, frequency signal is transformed to serial
Digital signal or parallel digital signal, then received this digital signal by another processor, it is achieved communication
The reception of signal；Or directly gathered the output signal of amplifier by another processor, by calculating
Go out communication signal, it is achieved communication signal receives.
Power battery pack internal resistance measurement system the most according to claim 5, it is characterised in that institute
Stating first processor to be also connected with isolation communication element, described first processor is led to by described isolation
News element carries out communication with described system peripherals and is connected.
Power battery pack internal resistance measurement system the most according to claim 8, it is characterised in that institute
State isolation communication element to include: CAN/485 communication interface.
Electrokinetic cell internal resistance measurement the most according to claim 3 and communication system, its feature exists
In, described measurement loop also includes:
First electric capacity, the first inductance, the second electric capacity and the second inductance, described first electric capacity and the first electricity
Feel the branch circuit parallel connection after the branch road after series connection and the second electric capacity and the series connection of the second inductance, described second electric capacity
It is additionally provided with switch with on the branch road after the second inductance series connection；In the most described measurement loop is used for realizing
Resistance is measured and internal communication；
Or,
Described measurement loop also includes: inductance, electric capacity and the series circuit of switch composition, now leads to
Cross the electrical equipment communication at the series circuit two ends being connected in parallel on described inductance, electric capacity and switch composition.
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