CN107490770A - The internal resistance estimating system and method for a kind of energy-storage system - Google Patents
The internal resistance estimating system and method for a kind of energy-storage system Download PDFInfo
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- CN107490770A CN107490770A CN201710638876.2A CN201710638876A CN107490770A CN 107490770 A CN107490770 A CN 107490770A CN 201710638876 A CN201710638876 A CN 201710638876A CN 107490770 A CN107490770 A CN 107490770A
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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
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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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- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The present invention discloses the internal resistance estimating system and method for a kind of energy-storage system, including battery pack, current limiting switch unit, storage capacitor unit, current acquisition unit, electric capacity compression limiter, DC converter unit and control unit.When needing to carry out internal resistance measurement, battery is accessed into electric capacity using switching device, the larger current in the short time is produced, the curent change and voltage change of the energy-storage battery group surveyed respectively, the estimation of internal resistance is carried out further according to Ohm's law.The power storage of energy-storage battery is in storage capacitor during internal resistance measurement, after measurement, is again returned to the electricity that capacitor memory stores up in energy-storage battery group using DC dc converter.The present invention is the internal resistance estimating system and method for a kind of energy-storage system, when carrying out internal resistance estimation, test electric current can be obtained from power plant's group directly from the direct power taking of single battery core；After being completed, the electric energy of test can also be sent back in battery pack, reduce the energy loss of side internal resistance estimation.
Description
Technical field
The present invention relates to energy-storage system technical field, more particularly to a kind of internal resistance estimating system of energy-storage system and side
Method.
Background technology
In energy-storage system, the internal resistance of energy-storage battery is to weigh an important indicator of battery performance, and battery is different
When state-of-charge, service life state, its internal resistance parameter differs.There is aging, failure, damage in battery in energy-storage battery group
When, it can change from its internal resistance and be showed, so the internal resistance of detection energy-storage battery is to judge battery using state
An effective means.
At present, there is problem as described below in the internal resistance estimation of energy-storage system：
Using DC internal resistance metering system, this method needs to manufacture a larger DC current, and such metering system is past
Toward this measurement is directly consumed with DC current, the energy loss of energy-storage battery group is caused, and then exchange the measurement of internal resistance for.
Method of testing is injected using exchange, this method needs one internal resistance of addition between the both positive and negative polarity of each economize on electricity core to survey
Module is measured, this economize on electricity core is drawn by way of AC signal is injected between the both positive and negative polarity in this single-unit battery core and carries out corresponding measurement
Internal resistance value, such a method core that needs often to economize on electricity is required for installing internal resistance measurement module, and internal resistance measurement module is needed from quilt
The power supply that battery core takes is surveyed, even if in the case of without internal resistance measurement, still needs to consume the electric energy of battery core, in single-unit battery core electricity
Press it is extremely low in the case of, this power consumption may cause battery core to enter deep under-voltage, finally damage battery core.Other internal resistance measurement module
Data need to use connection carry out data upload, more internal resistance measurement module number also lead to communicate wire harness between
Annexation is complicated.
The content of the invention
The purpose of the present invention is to overcome weak point of the prior art, there is provided a kind of internal resistance estimating system of energy-storage system
And method, direct consumed DC current is avoided, causes battery pack power largely to lose, and it is complicated which system reduces wiring
Degree, improve the reliability of system.
The purpose of the present invention is achieved through the following technical solutions：
A kind of internal resistance estimating system of energy-storage system, including：Battery pack, current limiting switch unit, storage capacitor unit, electric current
Collecting unit, electric capacity compression limiter, DC-dc conversion unit and control unit,
The battery pack, current limiting switch unit, storage capacitor unit, current acquisition unit are in turn connected to form and discharged back
Road, the storage capacitor unit form energy recovery circuit by DC-dc conversion unit and battery pack；
The electric capacity compression limiter receives the limiting voltage signal of storage capacitor unit, and according to limiting voltage signal output
Disconnect switching signal and give current limiting switch unit；Described control unit outputs level signals give electric capacity compression limiter, the electric capacity limit
Pressure unit controls being switched on or switched off for current limiting switch unit according to level signal；The current acquisition unit output current signal is given
Control unit, described control unit control the switch motion of DC-dc conversion unit according to energy returned signal.
As further preferred scheme, the current limiting switch unit includes the switch being connected in parallel by several metal-oxide-semiconductors
Matrix, the input of the switch matrix are connected with total anode of the battery pack, output end and the storage capacitor unit
Electrode input end is connected, and control terminal is connected with the output control terminal of the electric capacity compression limiter.
As further preferred scheme, the current limiting switch unit also includes the 4th resistance R4, the switch matrix
Output end is connected through the 4th resistance R4 with the electrode input end of the storage capacitor unit.
As further preferred scheme, the storage capacitor unit includes the storage being connected in parallel by several storage capacitors
Can capacitance matrix, the electrode input end of the storage capacitor matrix respectively with the DC-dc conversion unit and the current limliting
Switch element is connected, and negative input is connected with the input of the current acquisition unit.
As further preferred scheme, the electric capacity compression limiter includes the first optical coupling isolator U1, NAND gate circuit
U2, first resistor R1, second resistance R2,3rd resistor R3, the 5th resistance R5, the 7th resistance R7 and the 8th resistance R8,
The colelctor electrode of the first optical coupling isolator U1 connects institute after the second resistance R2 and the first resistor R1
Total anode of battery pack, grounded emitter are stated, the anode of the first optical coupling isolator U1 meets power supply VCC, and negative electrode is through institute
The output end that 3rd resistor R3 is stated with the NAND gate circuit U2 is connected；The first input end of the not circuit U2 is through described
First control terminal of seven resistance R7 and described control unit connects, and the second input of the not circuit U2 is through the described 5th electricity
It is connected after resistance R5 and the 8th resistance R8 with the second control terminal of described control unit；
Connecting node between the first resistor R1 and the second resistance R2 is as the defeated of the electric capacity compression limiter
The control terminal for going out control terminal with the switch element is connected.
As further preferred scheme, the electric capacity compression limiter also include comparator U4, the second optical coupling isolator U5,
6th resistance R6, the 9th resistance R9, the 12nd resistance R12, the 13rd resistance R13, the 14th resistance R14 and the 18th resistance
R18,
One end of the 6th resistance R6 is connected with the electrode input end of the storage capacitor unit, and the other end is through described
It is grounded after nine resistance R9, between the inverting input of the comparator U4 and the 6th resistance R6 and the 9th resistance R9
Connecting node connect, the 12nd resistance R12 one termination power supply VCC, the other end through the 18th resistance R18,
It is grounded after the 14th resistance R14, the in-phase input end of the comparator U4 and the 12nd resistance R12 and the described tenth
Connecting node connection between eight resistance R18, the output end of the comparator U4 after the 8th resistance R8 with the control
The second control terminal connection of unit；
The anode of the second optical coupling isolator U5 is followed by power supply VCC, negative electrode and institute through the 13rd resistance R13
State between the 5th resistance R5 and the 8th resistance R8 connecting node connection, the colelctor electrode of the second optical coupling isolator U5 with
Connecting node connection between the 18th resistance R18 and the 14th resistance R14, grounded emitter.
As further preferred scheme, the current acquisition unit includes calculus of differences discharger U6, the 11st resistance
R11, the 15th resistance R15, the 16th resistance R16, the 17th resistance R17, the 20th resistance R20 and the 21st resistance R21,
The first end of the 11st resistance R11 is connected with total negative terminal of the battery pack, and first end is also through the described tenth
It is connected after five resistance R15, the 20th resistance R20 with the output end of the calculus of differences discharger U6, the 11st electricity
Resistance R11 the second end be connected with the negative input of the storage capacitor unit, the second end also through the 16th resistance R16,
It is grounded after the 17th resistance R17；
The calculus of differences discharger U6 inverting inputs and the 15th resistance R15 and the 20th resistance R20
Between connecting node connection, the connection between in-phase input end and the 16th resistance R16 and the 17th resistance R17
Node is connected, and output end is also connected after the 21st resistance R21 with the 3rd control terminal of described control unit.
As further preferred scheme, in addition to the 19th resistance R19, one end of the 19th resistance R19 and institute
The 4th control terminal of control unit is stated, is connected, the other end is connected with the Enable Pin of the DC-dc conversion unit.
Internal resistance estimating system based on energy-storage system, the present invention also provide a kind of internal resistance evaluation method of energy-storage system, should
Method comprises the following steps：
S1, internal resistance estimating system start and sent to battery management system the triggering command for starting to produce test electric current；
S2, battery management system receive the voltage v of single-unit battery core in triggering command and Quick Acquisition battery pack；
S3, internal resistance estimating system produce test electric current i and recorded in real time by battery management system；
S4, interception test electric current i changing value △ i and voltage v changing value △ v；
S5, the internal resistance value r for estimating according to Ohm's law single-unit battery core in battery pack；
S6, electric energy returned in battery pack.
As further preferred scheme, the step S3 includes：
S31, switch matrix is opened, battery pack charges to storage capacitor, produces test electric current i and records test electricity in real time
Flow i；
S32, reach the limit values or during internal resistance estimating system active closing switch matrix when the voltage of storage capacitor, test electricity
Stream i, which is produced, to be finished.
The present invention compared to prior art the advantages of and have the beneficial effect that：
1st, the present invention is the internal resistance estimating system and method for a kind of energy-storage system, can be direct provided with current acquisition unit
From the direct power taking of single battery core, when carrying out internal resistance estimation, test electric current is obtained from battery pack；Also, it is additionally provided with storage capacitor
Unit, after being completed, the electric energy of test can also be sent back in battery pack, reduce the energy loss of side internal resistance estimation.
2nd, the present invention is a kind of internal resistance estimating system of energy-storage system, and the communication of complexity is all carried out without often saving single battery core
The connection of wire harness, the complexity of system wiring is reduced, add the degree of implementation of energy-storage system test internal resistance, improve system
Reliability.
3rd, the present invention is a kind of internal resistance evaluation method of energy-storage system, and this method first carries out the voltage acquisition of single-unit battery core,
Then test electric current in real time is re-recorded, internal resistance value is finally calculated according to Ohm's law.What is more important, it is being completed
Afterwards, also the electric energy in storage capacitor is sent back in battery pack, so as to reduce the electric energy of test, reduced when surveying internal resistance
Energy loss, improve the reliability of energy-storage system.
Brief description of the drawings
Fig. 1 is the theory diagram of the internal resistance estimating system of the energy-storage system of embodiment 1；
Fig. 2 is the circuit theory diagrams of the internal resistance estimating system of Fig. 1 energy-storage system；
Fig. 3 is the flow chart of the internal resistance evaluation method of the energy-storage system of the present invention.
Embodiment
For the ease of understanding the present invention, the present invention is described more fully below with reference to relevant drawings.In accompanying drawing
Give the better embodiment of the present invention.But the present invention can realize in many different forms, however it is not limited to herein
Described embodiment.On the contrary, the purpose for providing these embodiments is to make to understand more the disclosure
Add thorough and comprehensive.
It should be noted that when element is referred to as " being fixed on " another element, it can be directly on another element
Or there may also be element placed in the middle.When an element is considered as " connection " another element, it can be directly connected to
To another element or it may be simultaneously present centering elements.Term as used herein " vertical ", " horizontal ", " left side ",
For illustrative purposes only, it is unique embodiment to be not offered as " right side " and similar statement.
Unless otherwise defined, all of technologies and scientific terms used here by the article is with belonging to technical field of the invention
The implication that technical staff is generally understood that is identical.Term used in the description of the invention herein is intended merely to description tool
The purpose of the embodiment of body, it is not intended that in the limitation present invention.Term as used herein " and/or " include one or more
The arbitrary and all combination of related Listed Items.
Embodiment 1
The present invention a kind of the internal resistance estimating system and method for energy-storage system, are designed, the present invention adopts for problem above
It is that main devices carry out system design with energy lossless storage device storage capacitor.When needing to carry out internal resistance measurement, using opening
Close device and battery pack accessed into electric capacity, produce the larger current in the short time, measure respectively the curent change of energy-storage battery group with
Voltage change, the estimation of internal resistance is carried out further according to Ohm's law.The power storage of energy-storage battery is in energy storage during internal resistance measurement
In electric capacity, after measurement, the electricity that capacitor memory stores up is returned in energy-storage battery group again using DC-DC converter,
The energy loss of battery pack is reduced as far as possible.
Referring to Fig. 1, the present invention provides a kind of internal resistance estimating system 10 of energy-storage system, including：Battery pack 100, current limliting
Switch element 200, storage capacitor unit 300, current acquisition unit 400, electric capacity compression limiter 500, DC-dc conversion unit
600 and control unit 700.
The battery pack 100, current limiting switch unit 200, storage capacitor unit 300, current acquisition unit 400 are sequentially connected
Discharge loop is formed, the storage capacitor unit 300 forms energy by DC-dc conversion unit 600 and battery pack 100 and returned
Withdraw road.
The electric capacity compression limiter 500 receives the limiting voltage signal of storage capacitor unit 400, and is believed according to limiting voltage
Number export and to disconnect switching signal to current limiting switch unit 200；The outputs level signals of described control unit 700 give electric capacity compression limiter
500, the electric capacity compression limiter 500 controls being switched on or switched off for current limiting switch unit 200 according to level signal；The electric current is adopted
Collect the output current signal of unit 400 to control unit 700, described control unit 700 controls direct current-straight according to energy returned signal
Flow the switch motion of converter unit 600.Connected it is noted that described control unit 700 also communicates with battery management system.
Wherein, current limiting switch unit 200 is the switch matrix of metal-oxide-semiconductor composition, for large bulk capacitance quickly to be accessed into electricity
Pond group 100 forms test electric current.A less resistance value is passed in current limiting switch unit 200 to be used to limit test electric current
Size.The storage capacitor unit 300 of Large Copacity is used to absorb test electric current, while forming test electric current, by battery pack 100
Power storage is in storage capacitor；Storage capacitor unit 300 is the capacitance matrix of multiple storage capacitors composition.Current acquisition unit
400 be current sensor, and the real-time current value of test loop is flowed through for detecting.Electric capacity compression limiter 500 is to limit storage
The both end voltage of energy electric capacity, prevent that electric capacity both end voltage when storage capacitor absorbs battery current is pressure-resistant more than the limit of electric capacity.Directly
Stream-DC converting unit 600 then returns to the electric energy in electric capacity by boosting inverter the both positive and negative polarity of battery pack 100, realizes energy
Amount recovery.Control unit 700 be used for each unit between task distribution, data collection, event judgement, action executing and with electricity
Co-ordination of pond management system etc..
Referring to Fig. 2, the current limiting switch unit 200 includes the switch matrix being connected in parallel by several metal-oxide-semiconductors, it is described
The input of switch matrix is connected with total anode of the battery pack 100, the positive pole of output end and the storage capacitor unit 300
Input is connected, and control terminal is connected with the output control terminal of the electric capacity compression limiter.Specifically, the S poles of several metal-oxide-semiconductors according to
Secondary to be connected in series, D poles are also sequentially connected in series, and G poles are also sequentially connected in series.It is noted that what metal-oxide-semiconductor was together in series
S poles are connected as the input of current limiting switch unit 200 with total anode of battery pack 100, the D poles conduct that metal-oxide-semiconductor is together in series
The output end of current limiting switch unit 200 is connected with the electrode input end of storage capacitor unit 300, and the G poles that metal-oxide-semiconductor is together in series are made
It is connected for the control terminal of current limliting switch element 200 with the electric capacity compression limiter 500.Metal-oxide-semiconductor (Q1, Q2, Q3 ... Qn) forms
Switch matrix, the quantity of metal-oxide-semiconductor depend on the size of required test electric current.
Further, the current limiting switch unit 200 also includes the 4th resistance R4, and the output end of the switch matrix is through institute
The electrode input end that the 4th resistance R4 is stated with the storage capacitor unit 300 is connected.4th resistance R4 is current-limiting resistance, its resistance
It is smaller, only the size for testing electric current is limited in safe range.
It is noted that the storage capacitor unit 300 includes the storage capacitor being connected in parallel by several storage capacitors
Matrix, the electrode input end of the storage capacitor matrix respectively with the DC-dc conversion unit 600 and the current limiting switch
Unit 200 is connected, and negative input is connected with the input of the current acquisition unit 400.Storage capacitor (C1, C2, C3 ...
Cn storage capacitor matrix) is formed, for absorbing the electric energy of energy-storage battery, so as to produce short time larger test electric current, energy storage
The capacitance of electric capacity determines the size and current duration of test electric current with quantity.
The electric capacity compression limiter 500 includes the first optical coupling isolator U1, NAND gate circuit U2, first resistor R1, second
Resistance R2,3rd resistor R3, the 5th resistance R5, the 7th resistance R7 and the 8th resistance R8.
The colelctor electrode of the first optical coupling isolator U1 connects institute after the second resistance R2 and the first resistor R1
Total anode of battery pack 100, grounded emitter are stated, the anode of the first optical coupling isolator U1 connects power supply VCC, negative electrode warp
The 3rd resistor R3 is connected with the output end of the NAND gate circuit U2；Described in the first input end warp of the not circuit U2
7th resistance R7 is connected with the first control terminal (DO) of described control unit 700, the second input warp of the not circuit U2
It is connected after the 5th resistance R5 and the 8th resistance R8 with the second control terminal (DI) of described control unit 700；Described
Output control terminal and institute of the connecting node as the electric capacity compression limiter 500 between one resistance R1 and the second resistance R2
State the control terminal connection of switch element.The electric capacity compression limiter 500 also includes voltage-regulator diode D1, the voltage-regulator diode D1
It is in parallel with first resistor R1 both ends.
The electric capacity compression limiter 500 also includes comparator U4, the second optical coupling isolator U5, the 6th resistance R6, the 9th electricity
Hinder R9, the 12nd resistance R12, the 13rd resistance R13, the 14th resistance R14 and the 18th resistance R18.
One end of the 6th resistance R6 is connected with the electrode input end of the storage capacitor unit 300, and the other end is through institute
Be grounded after stating the 9th resistance R9, the inverting input of the comparator U4 and the 6th resistance R6 and the 9th resistance R9 it
Between connecting node connection, the 12nd resistance R12 one termination power supply VCC, the other end is through the 18th resistance
It is grounded after R18, the 14th resistance R14, the in-phase input end of the comparator U4 and the 12nd resistance R12 and described
Connecting node connection between 18th resistance R18, the output end of the comparator U4 after the 8th resistance R8 with it is described
The second control terminal (DI) connection of control unit 700.
The anode of the second optical coupling isolator U5 is followed by power supply VCC, negative electrode and institute through the 13rd resistance R13
State between the 5th resistance R5 and the 8th resistance R8 connecting node connection, the colelctor electrode of the second optical coupling isolator U5 with
Connecting node connection between the 18th resistance R18 and the 14th resistance R14, grounded emitter.
The current acquisition unit 400 include calculus of differences discharger U6, the 11st resistance R11, the 15th resistance R15,
16th resistance R16, the 17th resistance R17, the 20th resistance R20 and the 21st resistance R21.
The first end of the 11st resistance R11 is connected with total negative terminal of the battery pack 100, and first end is also through described
It is connected after 15 resistance R15, the 20th resistance R20 with the output end of the calculus of differences discharger U6, the described 11st
Resistance R11 the second end is connected with the negative input of the storage capacitor unit 300, and the second end is also through the 16th resistance
It is grounded after R16, the 17th resistance R17；The calculus of differences discharger U6 inverting inputs and the 15th resistance R15
Connecting node connection between the 20th resistance R20, in-phase input end and the 16th resistance R16 and the described tenth
Between seven resistance R17 connecting node connection, output end also after the 21st resistance R21 with described control unit 700
The 3rd control terminal (AI) connection.
The internal resistance estimating system of energy-storage system also includes the 19th resistance R19, one end of the 19th resistance R19 and institute
The 4th control terminal (CTR) connection of control unit 700 is stated, the Enable Pin of the other end and the DC-dc conversion unit 600 connects
Connect.
It is noted that microcontroller U3, microcontroller U3 TRI of the control unit 700 using model DS12C88
Pin also also connects the signal triggering end of battery management system by the tenth resistance.Also, microcontroller U3 RXD pins and
TXD pins are connected by communicating wire harness with battery management system communication.
The course of work：
When energy-storage system needs to estimate the internal resistance value of energy-storage battery, the battery management system of energy-storage system passes through connection
Send and instruct to internal resistance estimating system, internal resistance estimating system then starts to produce test electric current, microcontroller U3 DO pins output
High level.Due to now non-storage energy in storage capacitor matrix, the voltage of storage capacitor is pressure-resistant less than the limit of storage capacitor
Value, comparator U4 anti-phase input terminal potential are less than the reference voltage of in-phase input end, the comparator U4 high electricity of output end output
It is flat.Then NAND gate circuit U2 output is low level, then the first optical coupling isolator U1 light emitting diode is lighted, light sensation triode
Turn on, first resistor R1 and second resistance R2 generation partial pressures, the voltage on first resistor R1 opens the metal-oxide-semiconductor conducting of switch matrix
Open, i.e., now energy-storage battery group starts to discharge to storage capacitor matrix, produces test electric current.
In order to ensure the synchronism of the battery core voltage acquisition of the generation of test electric current and battery pack, microcontroller U3 is being opened
A period of time t before the metal-oxide-semiconductor of switch matrix, a triggering level is exported on TRI pins, for prior notice cell tube
Reason system, internal resistance estimation test electric current will produce, and please carry out the preparation of single battery core voltage Quick Acquisition.When energy storage electricity
When appearance matrix starts to absorb the energy of energy-storage battery, measurement electric current produces, and this can be discharged by calculus of differences discharger U6
Electric current is detected, and this modulus amount is scaled real current by the digital-to-analogue conversion pin AI, microcontroller U3 that deliver to microcontroller U3
It is worth and carries out data record.With the energy stores of storage capacitor, the magnitude of voltage at storage capacitor both ends is also constantly raising.
Because comparator U4 in-phase input ends are arranged to the reference voltage corresponding with limiting voltage, comparator U4 is anti-phase defeated
Enter the partial pressure that end is arranged to electric capacity virtual voltage, so when storage capacitor voltage will reach capacity magnitude of voltage, comparator U4
Anti-phase input terminal voltage be more than homophase input terminal voltage, so comparator U4 output is changed into low level from high level.One side
Face NAND gate circuit U2 the second input (B) is changed into low level because of the output of comparator, and NAND gate circuit U2 is exported by low
Level is changed into high level, then the first photoelectrical coupler U1 light emitting diodes do not work, the first photoelectrical coupler U1 pole of light sensation three
Pipe is in nonconducting state, then metal-oxide-semiconductor switch matrix disconnects, and storage capacitor matrix stops absorbing energy-storage battery electric energy, energy storage electricity
Hold voltage to stop rising, so as to play a part of protecting storage capacitor；Another aspect comparator U4 output can be delivered to micro-control
Device U3 processed DI pins, for informing microcontroller U3 storage capacitors and reaching the limit of voltage, metal-oxide-semiconductor switch matrix disconnects.
Second photoelectrical coupler U5 is used for the output for pinning comparator U4, prevents comparator U4 output because of storage capacitor
Fuctuation within a narrow range or interference and change repeatedly.When comparator U4 exports low level, the second photoelectrical coupler U5 light emitting diode points
Bright, light sensation triode ON, the reference voltage of comparator U4 in-phase input end is lowered, anti-phase input terminal voltage fuctuation within a narrow range
Also the reference voltage of in-phase input end is not less than, so comparator U4 output is locked in low level, only works as energy storage
When capacitance voltage substantially reduces, comparator U4 output just returns recovery to high level.
Finished when test electric current has produced, microcontroller U3 is by controlling pin CTR to enable direct current-direct current conversion unit
Start, the electricity in storage capacitor matrix is delivered between the both positive and negative polarity of battery pack.
The present invention is a kind of internal resistance estimating system of energy-storage system, can be directly from monomer electricity provided with current acquisition unit
The direct power taking of core, when carrying out internal resistance estimation, test electric current is obtained from power plant's group；Also, storage capacitor unit is additionally provided with, works as survey
After examination, the electric energy of test can also be sent back in battery pack, reduce the energy loss of side internal resistance estimation.The present invention need not
Often section single battery core all carries out the connection of the communication wire harness of complexity, reduces the complexity of system wiring, adds energy-storage system
The degree of implementation of internal resistance is tested, improves the reliability of system.
Embodiment 2
Referring to Fig. 3, the internal resistance estimating system based on above-mentioned energy-storage system, the present invention also provides a kind of energy-storage system
Internal resistance evaluation method 20, this method comprises the following steps：
Step 1：Battery management system sends internal resistance estimation enabled instruction to internal resistance estimating system；
Step 2：Internal resistance estimating system is ready, and being sent to battery management system will start to produce test electric current
Triggering command；
Step 3：Battery management system receives the Quick Acquisition that triggering command proceeds by single-unit battery core voltage v；
Step 4：Internal resistance estimating system opens switch matrix, is charged to storage capacitor matrix, and test electric current i is produced and quilt
Record in real time；
Step 5：When storage capacitor voltage reaches the limit values or internal resistance estimating system active closing switch matrix, test
Electric current terminates, and internal resistance estimating system sends " test electric current, which produces, to be finished " and instructed to battery management system；
Step 6：Battery management system stops single-unit battery core voltage v Quick Acquisition, returns to normal voltage acquisition mould
Formula；
Step 7：Internal resistance estimating system interception test electric current i changing value Δ i is actually available data, battery management system
System interception single battery core voltage v changing value Δ v is actually available data, then estimates battery pack according to formula r=Δ v/ Δs i
The DC internal resistance value of interior single-unit battery core；
Step 8：After internal resistance is estimated, the microcontroller of internal resistance estimating system starts DC-to-dc by control signal
Converter, the electric energy in storage capacitor matrix is returned in battery pack.
The present invention is a kind of internal resistance evaluation method of energy-storage system, and this method first carries out the voltage acquisition of single-unit battery core, so
After re-record in real time test electric current, internal resistance value is finally calculated according to Ohm's law.What is more important, it is being completed
Afterwards, also the electric energy in storage capacitor is sent back in battery pack, so as to reduce the electric energy of test, reduced when surveying internal resistance
Energy loss, improve the reliability of energy-storage system.
Embodiment described above only expresses the several embodiments of the present invention, and its description is more specific and detailed, but
Therefore the limitation to the scope of the claims of the present invention can not be interpreted as.It should be pointed out that the ordinary skill people for this area
For member, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the present invention's
Protection domain.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (10)
- A kind of 1. internal resistance estimating system of energy-storage system, it is characterised in that including：Battery pack, current limiting switch unit, storage capacitor Unit, current acquisition unit, electric capacity compression limiter, DC-dc conversion unit and control unit,The battery pack, current limiting switch unit, storage capacitor unit, current acquisition unit are in turn connected to form discharge loop, institute State storage capacitor unit and energy recovery circuit is formed by DC-dc conversion unit and battery pack；The electric capacity compression limiter receives the limiting voltage signal of storage capacitor unit, and is disconnected according to limiting voltage signal output Switching signal gives current limiting switch unit；Described control unit outputs level signals give electric capacity compression limiter, the electric capacity pressure limiting list Member controls being switched on or switched off for current limiting switch unit according to level signal；The current acquisition unit output current signal is to control Unit, described control unit control the switch motion of DC-dc conversion unit according to energy returned signal.
- 2. the internal resistance estimating system of energy-storage system according to claim 1, it is characterised in that the current limiting switch unit bag The switch matrix being connected in parallel by several metal-oxide-semiconductors is included, the input of the switch matrix and total anode of the battery pack connect Connect, output end is connected with the electrode input end of the storage capacitor unit, control terminal and the output control of the electric capacity compression limiter End connection processed.
- 3. the internal resistance estimating system of energy-storage system according to claim 2, it is characterised in that the current limiting switch unit is also Including the 4th resistance R4, the output end of the switch matrix is defeated through the 4th resistance R4 and the positive pole of the storage capacitor unit Enter end connection.
- 4. the internal resistance estimating system of energy-storage system according to claim 1, it is characterised in that the storage capacitor unit bag Include the storage capacitor matrix being connected in parallel by several storage capacitors, the electrode input end of the storage capacitor matrix respectively with institute State DC-dc conversion unit to connect with the current limiting switch unit, the input of negative input and the current acquisition unit End connection.
- 5. the internal resistance estimating system of energy-storage system according to claim 1, it is characterised in that the electric capacity compression limiter bag Include the first optical coupling isolator U1, NAND gate circuit U2, first resistor R1, second resistance R2,3rd resistor R3, the 5th resistance R5, 7th resistance R7 and the 8th resistance R8,The colelctor electrode of the first optical coupling isolator U1 connects the electricity after the second resistance R2 and the first resistor R1 Total anode of pond group, grounded emitter, the anode of the first optical coupling isolator U1 meet power supply VCC, and negative electrode is through described Three resistance R3 are connected with the output end of the NAND gate circuit U2；The first input end of the not circuit U2 is through the described 7th electricity The first control terminal for hindering R7 and described control unit connects, and the second input of the not circuit U2 is through the 5th resistance R5 It is connected with after the 8th resistance R8 with the second control terminal of described control unit；Output control of the connecting node as the electric capacity compression limiter between the first resistor R1 and the second resistance R2 End processed is connected with the control terminal of the switch element.
- 6. the internal resistance estimating system of energy-storage system according to claim 5, it is characterised in that the electric capacity compression limiter is also Including comparator U4, the second optical coupling isolator U5, the 6th resistance R6, the 9th resistance R9, the 12nd resistance R12, the 13rd resistance R13, the 14th resistance R14 and the 18th resistance R18,One end of the 6th resistance R6 is connected with the electrode input end of the storage capacitor unit, and the other end is through the described 9th electricity It is grounded after resistance R9, the connection between the inverting input of the comparator U4 and the 6th resistance R6 and the 9th resistance R9 Node connects, and a termination power supply VCC of the 12nd resistance R12, the other end is through the 18th resistance R18, described It is grounded after 14th resistance R14, the in-phase input end of the comparator U4 and the 12nd resistance R12 and the 18th electricity Hinder the connecting node connection between R18, the output end of the comparator U4 after the 8th resistance R8 with described control unit The second control terminal connection；The anode of the second optical coupling isolator U5 is followed by power supply VCC through the 13rd resistance R13, negative electrode and described the Between five resistance R5 and the 8th resistance R8 connecting node connection, the colelctor electrode of the second optical coupling isolator U5 with it is described Connecting node connection between 18th resistance R18 and the 14th resistance R14, grounded emitter.
- 7. the internal resistance estimating system of energy-storage system according to claim 1, it is characterised in that the current acquisition unit bag Include calculus of differences discharger U6, the 11st resistance R11, the 15th resistance R15, the 16th resistance R16, the 17th resistance R17, 20 resistance R20 and the 21st resistance R21,The first end of the 11st resistance R11 is connected with total negative terminal of the battery pack, and first end is also through the described 15th electricity It is connected after resistance R15, the 20th resistance R20 with the output end of the calculus of differences discharger U6, the 11st resistance R11 The second end be connected with the negative input of the storage capacitor unit, the second end is also through the 16th resistance R16, described It is grounded after 17 resistance R17；Between the calculus of differences discharger U6 inverting inputs and the 15th resistance R15 and the 20th resistance R20 Connecting node connection, the connecting node between in-phase input end and the 16th resistance R16 and the 17th resistance R17 Connection, output end are also connected after the 21st resistance R21 with the 3rd control terminal of described control unit.
- 8. the internal resistance estimating system of energy-storage system according to claim 1, it is characterised in that also including the 19th resistance R19, one end of the 19th resistance R19 and the 4th control terminal of described control unit, connection, the other end and the direct current- The Enable Pin connection of DC converting unit.
- 9. the internal resistance evaluation method of the internal resistance estimating system based on the energy-storage system described in any one of claim 1 to 8, its feature It is, this method comprises the following steps：S1, internal resistance estimating system start and sent to battery management system the triggering command for starting to produce test electric current；S2, battery management system receive the voltage v of single-unit battery core in triggering command and Quick Acquisition battery pack；S3, internal resistance estimating system produce test electric current i and recorded in real time by battery management system；S4, interception test electric current i changing value △ i and voltage v changing value △ v；S5, the internal resistance value r for estimating according to Ohm's law single-unit battery core in battery pack；S6, electric energy returned in battery pack.
- 10. the internal resistance evaluation method of energy-storage system according to claim 9, it is characterised in that the step S3 includes：S31, switch matrix is opened, battery pack charges to storage capacitor, produces test electric current i and records test electric current i in real time；S32, when the voltage of storage capacitor reaches the limit values or during internal resistance estimating system active closing switch matrix, test electric current i Generation finishes.
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| CN201710638876.2A CN107490770A (en) | 2017-07-31 | 2017-07-31 | The internal resistance estimating system and method for a kind of energy-storage system |
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| CN201710638876.2A CN107490770A (en) | 2017-07-31 | 2017-07-31 | The internal resistance estimating system and method for a kind of energy-storage system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109946613A (en) * | 2019-04-08 | 2019-06-28 | 上海理工大学 | The internal resistance On-line Estimation and life detecting method of Vehicular dynamic battery |
| CN113702847A (en) * | 2021-08-24 | 2021-11-26 | 哈尔滨佳云科技有限公司 | Current parameter acquisition method suitable for energy storage battery pack |
| CN113777490A (en) * | 2021-08-26 | 2021-12-10 | 福建星云电子股份有限公司 | Current synchronization system and method for battery test equipment |
-
2017
- 2017-07-31 CN CN201710638876.2A patent/CN107490770A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109946613A (en) * | 2019-04-08 | 2019-06-28 | 上海理工大学 | The internal resistance On-line Estimation and life detecting method of Vehicular dynamic battery |
| CN113702847A (en) * | 2021-08-24 | 2021-11-26 | 哈尔滨佳云科技有限公司 | Current parameter acquisition method suitable for energy storage battery pack |
| CN113777490A (en) * | 2021-08-26 | 2021-12-10 | 福建星云电子股份有限公司 | Current synchronization system and method for battery test equipment |
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