CN106154027A - A kind of voltage polling device for electrochemical energy storage device - Google Patents
A kind of voltage polling device for electrochemical energy storage device Download PDFInfo
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- CN106154027A CN106154027A CN201610503113.2A CN201610503113A CN106154027A CN 106154027 A CN106154027 A CN 106154027A CN 201610503113 A CN201610503113 A CN 201610503113A CN 106154027 A CN106154027 A CN 106154027A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The present invention relates to a kind of voltage polling device, include the voltage and current signal of the electrochemical energy storage device of multiple energy storage monomer for monitoring, including: the first signal processing module, secondary signal processing module, the 3rd signal processing module and control module.The voltage polling device that the present invention provides can measure the whole heap low frequency output voltage of electrochemical energy storage device, whole heap low frequency output electric current, the low frequency output voltage of each energy storage monomer under steady-working state；And under dynamic behavior, spy is under ac impedance measurement pattern, the whole heap dynamic output voltage of synchro measure electrochemical energy storage device, whole heap dynamical output electric current, synchro measure each energy storage monomer dynamic output voltage, monomer dynamical output electric current.
Description
Technical field
The present invention relates to a kind of voltage polling device.
Background technology
Hydrogen-oxygen proton exchange membrane fuel cell (Proton Exchange Membrane Fuel Cell is called for short PEMFC)
Being a kind of electrochemical appliance, chemical energy is directly converted to electric energy, the conversion of traditional combustion engine energy is limited by Carnot cycle, and
The conversion of hydrogen-oxygen proton exchange membrane fuel cell energy is not limited by Carnot cycle, and its energy conversion efficiency is higher in theory.Due to
The material participating in reaction is hydrogen and air, and product is water, does not produce noxious emission, therefore suffers from the green grass or young crops of people
Look at, be gradually applied to the fields such as stand-by station, transportation and portable power source.
Proton Exchange Membrane Fuel Cells output characteristics is direct current, and its monolithic output voltage is less than 1V, is typically 0.7V, in order to
Higher voltage can be provided, need to be cascaded a lot of fuel cell monolithics, form fuel cell pile, its output work
Rate improves accordingly.Fuel cell monolithic is by anode gas diffusion layer (Gas Diffusion Layer is called for short GDL), membrane electrode assembly
Part (Membrane Electrode Assemblies is called for short MEA) and cathode gas diffusion layer composition.
Fuel cell pile is the core component of fuel cell generation, is with many accessory system auxiliary outside pile
Fuel cell pile is operated, including air system, hydrogen gas system, cooling system, power regulating system, humidification system and control
System processed etc..Air system is responsible for the oxidant i.e. air that pile provides appropriate, needs to enter pile according to regulating working conditions
The temperature of air, pressure and flow；Hydrogen gas system is responsible for pile supply hydrogen, needs to enter the hydrogen of pile according to regulating working conditions
Atmospheric pressure and flow；Cooling system then makes stack temperature keep proper level by the way of coolant circulates, it is ensured that pile is steady
Determine reliability service；Power regulating system then makes fuel electricity by the way of regulation fuel cell pile output voltage or output electric current
Cell system output characteristics can meet loading demand；Humidification system is responsible for the humidity that regulation enters the air of pile, overdrying or overly moist
PEM and pile there is adverse influence, it is therefore desirable to the air entering pile is carried out humid control；Control system
System is whole fuel cell generation " brain ", especially the subsystems that pile is peripheral is optimized control so that
Pile is in optimum Working, it is ensured that pile long time stability runs.
Referring to Fig. 1, a kind of typical fuel cell system 100 includes fuel cell pile 10, hydrogen gas system 12, air
System 14, cooling system 16, recovery system 18 and DC/DC controller 19.Wherein, air system 14 includes air compressor machine 142, dissipates
Hot device 144, humidifier 146 and first flow control valve 148.Described recovery system 18 includes condenser 182 and second
Control valve 184.Surrounding air enters radiator 144 after compressing via air compressor machine 142, radiator 144 enter after cooling down and increase
Wet device 146 is humidified, and enters fuel cell pile 10 after humidification, the oxygen of fuel cell pile 10 cathode side and from anode
The hydrion generation chemical reaction of side, produces water (gaseous state or liquid) while output electric energy.Therefore reacted in participation
In cathode air, oxygen content declines, and water content (humidity) increases.The condensed device of air 182 in fuel cell pile 10 outlet
After reclaiming moisture, entered in air ambient by second flow control valve 184.Wherein, air compressor machine 142, first flow can be passed through
The coordination of control valve 148 and second flow control valve controls to enter air mass flow and the air of fuel cell pile 10
Pressure, can adjust intake air temperature by radiator 144, control ambient humidity by humidifier 146.
Operation principle according to PEMFC and performance characteristics, the water (gas generated due to fuel cell pile internal-response
State or liquid) need to take out of through cathode reaction passage, if the aqueous water generated is got rid of not in time, the water of generation can hinder
Runner, the most so-called water logging phenomenon, cause Performance data to decline, affect the use of fuel cell.In order to improve drainability, need
Flow or the flow velocity of air to be improved are to blow down aqueous water smoothly.When idling or Smaller load, owing to the water yield generated is less than normal,
If being always maintained at bigger air mass flow, the most easily runner and Surface modification of proton exchange membrane water are all dried up, cause film overdrying and
Hydraulic performance decline；If being always maintained at less air mass flow, then the aqueous water that is not easy to blow away in runner and cause water logging.
In Fuel Cell Control System, based on existing sensor configuration, pass including anode and cathode inlet temperature and pressure
Sensor, anode and cathode outlet temperature and pressure transducer, negative electrode import and export humidity sensor.Generally use lumped parameter model to combustion
Material battery pile inner workings is observed, but owing to fuel cell pile is in series by many monolithics, is supplied by pile
The restriction of gas system structure, each fuel cell monolithic admission pressure, temperature, humidity and air-intake component difference.Monolithic
Supply state difference and temperature contrast cause monolithic voltage discordance occur.When and monolithic quantity unreasonable for system structure increase
Added-time, monolithic voltage discordance becomes apparent from.Due to can not the duty of real-time monitored fuel cell monolithic, especially can not
Timely and effective judge whether monolithic occurs that water logging or film do phenomenon.Therefore, by fuel cell air supply system and humidification system
Control realization regulation fuel battery inside duty be difficult to avoid that occur that local burnup's battery monomer occurs that water logging or film are done
Phenomenon, this is the most disadvantageous to fuel cell system performance boost.
The most accurately learn fuel cell monolithic duty, it is judged that whether fuel cell monolithic is in non-normal working shape
State such as film is done or water logging, adjusts fuel cell air supply system and humidification system controlling unit in time, to improve fuel cell performance
Can, it is a challenge of fuel cell system control.
Along with the progress of science and technology, by constantly furtheing investigate, it has been found that the Performance Characteristics of fuel cell is permissible
Studying by the mode of equivalent circuit, it is certain right to have between the duty of fuel cell and equivalent circuit middle impedance unit
Should be related to.Relation between fuel cell equivalent circuit and fuel battery performance, fuel cell equivalent circuit resistance
Corresponding relation between unit, electric capacity unit assembly status different from fuel cell pile, by obtaining fuel cell etc. in real time
Resistance unit and the change in impedance value of electric capacity unit in effect circuit, it is possible to Accurate Prediction fuel cell monolithic duty and fuel electricity
Pond pile overall work state.For obtaining resistance and capacitance parameter in fuel cell equivalent circuit, need to carry out AC impedance and grind
Study carefully.Commercialization ac resistance analysis equipment in the market, involve great expense, working condition require height, its operating voltage range
All cannot meet the requirement of existing fuel cell motor bus system with current range, naturally be difficulty with large-scale real vehicle
Application.
Carry out the AC impedance frequency spectrum identification of the whole heap of fuel cell or monolithic, need not only to enough generations and fill to electrochemistry
Put applying current disturbing or the power-converting device of voltage disturbance, such as programmable electronic load or dcdc converter etc.,
Also need to the whole parts to electrochemical appliance and the voltage of each monolithic, current signal are acquired, process and analyze joins
Cover system, namely voltage polling device.
Summary of the invention
In view of this, necessary offer one is the most effective and lower-cost voltage polling device.
A kind of voltage polling device, for monitoring by the voltage of the monomer series-connected electrochemical energy storage device formed of multiple energy storage
Current signal, including: current sampling resistor, it is connected on during use in the output loop of electrochemical energy storage device to be measured；First letter
Number processing module, for obtaining the first voltage difference, this first voltage difference is the voltage difference at described current sampling resistor two ends
Value, and this first voltage difference is carried out signal condition to obtain the first current signal and the second current signal；At secondary signal
Reason module, for obtaining the second voltage difference, this second voltage difference is single energy storage in described electrochemical energy storage device to be measured
The voltage difference of monomer, and this second voltage difference is carried out signal condition to obtain the first monolithic signal and the second monolithic letter
Number；3rd signal processing module, is used for obtaining tertiary voltage difference, and this tertiary voltage difference is described electrochemical energy storage to be measured dress
Put the voltage difference between output head anode and negative pole, and this tertiary voltage difference is carried out signal condition to obtain the first voltage
Signal and the second voltage signal；Control module, be used for receiving described first current signal, described second current signal, described
One monolithic signal, described second monolithic signal, described first voltage signal, described second voltage signal, and control described
The voltage of each energy storage monomer is sampled by binary signal processing module.
The voltage polling device that the present invention provides under steady-working state, can measure the whole heap of electrochemical energy storage device
Low frequency output voltage, whole heap low frequency output electric current, the low frequency output voltage of each energy storage monomer, and under dynamic behavior,
The whole heap dynamic output voltage of synchro measure electrochemical energy storage device, whole heap dynamical output electric current, synchro measure each energy storage monomer
Dynamic output voltage.
Accompanying drawing explanation
Fig. 1 is fuel cell system structure schematic diagram in prior art.
The voltage polling apparatus structure schematic diagram that Fig. 2 provides for the embodiment of the present invention.
The voltage polling device signal processing module structural representation that Fig. 3 provides for the embodiment of the present invention.
Voltage signal channel selecting schematic diagram in the voltage polling device that Fig. 4 provides for the embodiment of the present invention.
Control module structural representation in the voltage polling device that Fig. 5 provides for the embodiment of the present invention.
Main element symbol description
| Voltage polling device | 20 | Second high-pass filtering and reverse amplification circuit | 2324 |
| Current sampling resistor | 21 | 3rd low-pass filter circuit | 2325 |
| First current signal end | 211 | Second low-pass filtering and range-adjusting circuit | 2326 |
| Second current signal end | 212 | 4th low-pass filter circuit | 2328 |
| First signal processing module | 22 | 3rd signal processing module | 24 |
| First high common-mode differential circuit | 221 | 5th high common-mode differential circuit | 241 |
| Second high common-mode differential circuit | 222 | 6th high common-mode differential circuit | 242 |
| First low-pass filtering and range-adjusting circuit | 223 | 3rd low-pass filtering and range-adjusting circuit | 243 |
| First high-pass filtering and reverse amplification circuit | 224 | 3rd high-pass filtering and reverse amplification circuit | 244 |
| First low-pass filter circuit | 225 | 5th low-pass filter circuit | 245 |
| First low-pass filtering and range-adjusting circuit | 226 | 3rd low-pass filtering and range-adjusting circuit | 246 |
| Second low-pass filter circuit | 228 | 6th low-pass filter circuit | 248 |
| Secondary signal processing module | 23 | Control module | 25 |
| Signal gating submodule | 231 | A/D transform subblock | 251 |
| Signal processing submodule | 232 | Communication submodule | 252 |
| Three-hypers common-mode differential circuit | 2321 | A/D transform subblock | 251 |
| 4th high common-mode differential circuit | 2322 | Communication submodule | 252 |
| Second low-pass filtering and range-adjusting circuit | 2323 |
Following detailed description of the invention will further illustrate the present invention in conjunction with above-mentioned accompanying drawing.
Detailed description of the invention
The voltage polling device provided the present invention below in conjunction with the accompanying drawings and the specific embodiments is made the most specifically
Bright.
The embodiment of the present invention provides a kind of voltage polling device, for monitoring the voltage x current letter of electrochemical energy storage device
Number.
Electrochemical energy storage device to be monitored in the present embodiment generally includes one or more energy storage monomer, this or many
Individual energy storage monomer produces electric energy by chemical reaction.These one or more electrochemical energy storage monomers can be fuel cell, lithium
At least one in ion battery and ultracapacitor.Electrochemical energy storage monomer in the embodiment of the present invention is fuel cell,
Accordingly, described electrochemical energy storage device is the fuel cell pile that multiple fuel cell monolithic is composed in series, each fuel electricity
The numbering of pond monolithic is designated as the 1st battery monomer, the 2nd battery monomer to N battery monomer successively according to voltage height relatively.
Described in the present embodiment, voltage and current signal includes: steady state voltage current signal and dynamic electric voltage current signal.
Wherein, monitoring steady state voltage current signal refers to that described electrochemical energy storage device, under steady-working state, measures this electrochemistry
The whole heap low frequency output voltage of energy storage device, whole heap low frequency output electric current, the low frequency output voltage of each energy storage monomer；Monitoring is dynamically
Voltage and current signal refer to described electrochemical energy storage device under dynamic behavior, spy is in ac impedance measurement pattern
Under, the whole heap dynamic output voltage of this electrochemical energy storage device of synchro measure, whole heap dynamical output electric current, each energy storage of synchro measure
Monomer dynamic output voltage.
Referring to Fig. 2, the voltage polling device 20 that the embodiment of the present invention provides includes: current sampling resistor 21, first is believed
Number processing module 22, secondary signal processing module the 23, the 3rd signal processing module 24, control module 25.
Described current sampling resistor 21 is connected in the output loop of electrochemical energy storage device to be measured when measuring.Electric current is adopted
The concrete installation site of sample resistance 21, without particular/special requirement, only need to ensure that it measures electric current and electrochemical energy storage device to be measured output electricity
Stream is consistent.The two ends of described current sampling resistor 21 are respectively the first current signal end 211 and the second current signal end
212.Whole for fuel cell heap output current signal is converted to voltage signal by current sampling resistor 21 described in the present embodiment, and i.e.
One current signal end 211 and the voltage difference of the second current signal end 212.For ensureing that this voltage difference is positive voltage, the first electricity
Stream signal end 211 is more nearly fuel cell pile output head anode compared to the second current signal end 212.
Described first signal processing module 22 is for obtaining the first voltage difference, and this first voltage difference is that described electric current is adopted
The voltage difference at sample resistance 21 two ends, and this first voltage difference is carried out signal condition to obtain the first signal cluster.Described
Voltage difference between one voltage difference that is first current signal end 211 and the second current signal end 212.This first signal processing mould
Block 22 is analog circuit, and described first voltage difference analog electrical signal after analog circuitry processes is the first signal cluster,
This first signal cluster is admitted to described control module 25.
Specifically, described first signal processing module 22 carries out calculus of differences, low pass successively to described first voltage difference
Filtering is with range-adjusting, low-pass filtering is to obtain the first current signal S21, and this first voltage difference is carried out difference successively
Computing, high-pass filtering and reverse amplification, low-pass filtering and range-adjusting, low-pass filtering are to obtain the second current signal S22.Described
First current signal S21 is low frequency signal, is used for meeting output actual to described electrochemical energy storage device to be measured during steady operation
The monitoring of electric current, described second current signal S22 is the signal of changeable frequency, and its available frequency range is 0.1Hz ~ 5kHz, excellent
The frequency range of choosing is 0.1Hz ~ 1kHz.By the control of control module 25 can realize this second current signal S22 same
Pacing amount, when being used for meeting dynamic duty, when particularly carrying out ac impedance measurement, defeated to electrochemical energy storage device reality to be measured
Go out the monitoring of electric current.This first current signal S21 and the second current signal S22 is collectively referred to as the first signal cluster.It is appreciated that frequency
The selection of scope is affected by measurement pattern and the type of electrochemical energy storage device, working condition etc., is only given in the present embodiment
One optional scope, those skilled in the art can set corresponding frequency range as the case may be.
Referring to Fig. 3, described in the present embodiment, the first signal processing module 22 includes: the first high common mode being sequentially connected in series is poor
Parallel circuit the 221, first low-pass filtering and range-adjusting circuit 223 and the first low-pass filter circuit 225；And be sequentially connected in series
Second high common-mode differential circuit the 222, first high-pass filtering and reverse amplification circuit the 224, first low-pass filtering and range-adjusting electricity
Road 226 and the second low-pass filter circuit 228.
Described first high common-mode differential circuit 221 is for carrying out calculus of differences to described first voltage difference.Described first
Low-pass filtering and range-adjusting circuit 223 are for carrying out low pass filtered to the signal of described first high common-mode differential circuit 221 output
Ripple and range-adjusting.Described first low-pass filter circuit 225 is for defeated to described first low-pass filtering and range-adjusting circuit 223
The signal gone out carries out low-pass filtering, to obtain described first current signal S21.
Described second high common-mode differential circuit 222 is for carrying out calculus of differences to described first voltage difference.Described first
High-pass filtering and reverse amplification circuit 224 are for carrying out high pass filter to the signal of described second high common-mode differential circuit 222 output
Ripple and reversely amplification.Described first low-pass filtering and range-adjusting circuit 226 are for described first high-pass filtering and reversely putting
The signal of big circuit 224 output carries out low-pass filtering and range-adjusting.Described second low-pass filter circuit 228 is for described the
The signal of one low-pass filtering and range-adjusting circuit 226 output carries out low-pass filtering, to obtain described second current signal S22.
Described secondary signal processing module 23 is for obtaining the electricity of each energy storage monomer in described electrochemical energy storage device to be measured
Pressure difference, and this voltage difference is carried out signal condition.In the present embodiment, by each battery monomer electricity in fuel cell pile to be measured
Pressure is measured exit and is designated as monolithic voltage outfan P successively according to voltage height relatively0, monolithic voltage outfan P1To monolithic electricity
Pressure outfan PN.The voltage of the 1st battery monomer is exactly monolithic voltage outfan P0With monolithic voltage outfan P1Between voltage
Difference, the rest may be inferred, and the voltage of N battery monomer is exactly monolithic voltage outfan PN-1With monolithic voltage outfan PNBetween electricity
Pressure reduction.Above-mentioned voltage signal is analog electrical signal.
Secondary signal processing module described in the present embodiment 23 includes signal gating submodule 231 and signal processing submodule
232.Owing to fuel cell monolithic quantity is more, the most even can reach up to a hundred, typically larger than A/D converter input pin
Quantity, therefore uses signal gating submodule 231 to carry out the switching between monolithic sampling, can reduce sampling system in the present embodiment
System complexity, and then reduce system cost.If being appreciated that, the input interface of A/D converter is abundant, it is convenient to omit described
Signal gating submodule 231.Described signal processing submodule 232 is for carrying out signal tune to the cell monolithic voltage difference of gating
Reason.Described secondary signal processing module 23 selects different passage by constantly conversion, it is achieved adopt each cell monolithic voltage
Sample and signal processing.
Described signal gating submodule 231 includes multiple signal sampling path input, monolithic voltage outfan P0To list
Sheet voltage output end PNIt is all connected to the signal sampling path input of signal gating submodule 231 correspondence.Described signal selects
Under the effect of the control signal that logical submodule 231 exports in control module 25, it is achieved to a certain battery in fuel cell pile
The selection of monolithic voltage signal measurement, obtains the first gating monolithic signal and the second gating monolithic signal.
Specifically, described control module 25 digital output pin output control signal, i.e. control signal bunch, signal is selected
Logical submodule 231 is controlled, it is achieved the selection successively of each monolithic output voltage of the whole heap of fuel cell sampling.Described signal selects
The quantity of logical submodule 231 depends on the functional pin quantity of the integrated chip of channel selecting specifically used.First gating monolithic
Signal and the second gating monolithic signal are specifically chosen certain of the signal gating module determined through control module 25 control signal
The positive pole of individual fuel cell monolithic and negative pole.When the first gating monolithic signal is certain fuel cell monolithic positive pole, then second
Gating monolithic signal is this fuel cell monolithic negative pole；When the first gating monolithic signal is certain fuel cell monolithic negative pole,
Then the second gating monolithic signal is this fuel cell monolithic positive pole.The specific design scheme of signal gating submodule 231 can basis
Practical situation carries out specific aim selection, but gates monolithic signal and the second gating monolithic signal, ability including at least one group first
Enough guarantee carries out voltage sample to a fuel cell monolithic.
Please also refer to Fig. 2 and Fig. 4, if fuel cell monolithic quantity is N, in order to collect each monolithic voltage, need
The positive and negative end of all monolithics places voltage measurement line respectively, and the total quantity of voltage measurement line is 2N+2 root, this 2N+2 root electricity
Pressure is measured line and is designated as monolithic voltage signal end 0 to monolithic voltage signal end N, monolithic voltage signal end N+1 successively to monolithic voltage
Signal end 2N+1, wherein monolithic voltage signal end 0 is identical, by that analogy with monolithic voltage signal end N+1 institute link position.
Select certain monolithic to carry out signals collecting for convenience, use 2M signal gating submodule to carry out monolithic selection, tool
The implementation of body is: monolithic voltage signal end 0 to monolithic voltage signal end N is consecutively connected to the first signal gating submodule extremely
The signal input part of m-th signal gating submodule, monolithic voltage signal end N+1 is sequentially connected with to monolithic voltage signal end 2N+1
To the M+1 signal gating submodule to the signal input part of the 2M signal gating submodule.Each signal gating submodule
Block is required for the control signal from control module 25, and this control signal is for the selected conducting of control signal strobe sub-module
Port number, such as control module 25 need to select certain monolithic k, then be accomplished by finding the letter being respectively connected with this monolithic positive and negative terminal
Number strobe sub-module, it is assumed that be respectively the X signal gating submodule and the X+M signal gating submodule, then send life
This X signal gating submodule and the X+M signal gating submodule is given in order so that the first gating monolithic signal is monolithic k
Positive pole, the second gating monolithic signal be the negative pole of monolithic k, otherwise can also.
The quantity of signal gating submodule 231 depends on the performance of the integrated chip of selected signal gating, such as monolithic
Quantity N is 111, then the most altogether need 224 monolithic signal exits, it is assumed that an integrated chip of signal gating can be right
16 monolithic signal exits select, then the most altogether need 14 integrated chips of (224/16=14) this signal gating, false
If 10 monolithic signal exits can be selected by an integrated chip of signal gating, then the most altogether needs 24 these letters
Number gate integrated chip.
Further, described signal gating submodule 231 includes a forceful electric power and light current isolating chip.This is owing to controlling mould
Right and wrong for the voltage that the voltage signal that block (such as single-chip microcomputer) can bear is actually located compared to the fuel cell each monolithic of whole heap
The most weak, generally at below 5V, the control command from control module that the integrated chip of signal gating is accepted is typically with weak
The digital quantity form of electricity is given, and then signal gating chip forms signal conduction order, passes to the isolation of wanted selector channel
Chip turns on, and then could realize the final gating of monolithic voltage signal.Described isolating chip can be by light-coupled isolation module
Or the circuit realiration of magnetic coupling isolation module composition.
Described signal processing submodule 232 is for obtaining the second voltage difference, and this second voltage difference is described first choosing
Voltage difference between logical monolithic signal and the second gating monolithic signal, and this second voltage difference is carried out signal condition to obtain
Obtain secondary signal bunch.This signal processing submodule 232 is analog circuit, described second voltage difference through analog circuitry processes it
After analog electrical signal be secondary signal bunch, this secondary signal bunch is admitted to described control module 25.
Specifically, described signal processing submodule 232 carries out calculus of differences, low pass filtered successively to described second voltage difference
Ripple and range-adjusting, low-pass filtering are to obtain the first monolithic voltage signal S31 and the poorest to this second voltage difference
Partite transport calculation, high-pass filtering and reverse amplification, low-pass filtering and range-adjusting, low-pass filtering are to obtain the second monolithic voltage signal
S32.Described first monolithic voltage signal S31 is low frequency signal, to described electrochemical energy storage to be measured when being used for meeting steady operation
The monitoring of single energy storage monomer actual output voltage in device, described second monolithic voltage signal S32 is the signal of changeable frequency,
Its available frequency range is 0.1Hz ~ 5kHz, and preferred frequency range is 0.1Hz ~ 1kHz.Permissible by the control of control module
Realize the synchro measure to this second monolithic voltage signal S32, when being used for meeting dynamic duty, particularly carry out AC impedance survey
Monitoring during amount, to energy storage monomer actual output voltage single in electrochemical energy storage device to be measured.This first monolithic voltage signal
S31 and the second monolithic voltage signal S32 is collectively referred to as secondary signal bunch.Be appreciated that the selection of frequency range by measurement pattern and
The impact of the type of electrochemical energy storage device, working condition etc., only gives an optional scope, this area skill in the present embodiment
Art personnel can set corresponding frequency range as the case may be.
Referring to Fig. 3, signal processing submodule described in the present embodiment 232 includes: the three-hypers common mode being sequentially connected in series is poor
Parallel circuit the 2321, second low-pass filtering and range-adjusting circuit the 2323, the 3rd low-pass filter circuit 2325；And be sequentially connected in series
4th high common-mode differential circuit the 2322, second high-pass filtering and reverse amplification circuit the 2324, second low-pass filtering and range-adjusting
Circuit the 2326, the 4th low-pass filter circuit 2328.
Described three-hypers common-mode differential circuit 2321 is for carrying out calculus of differences to described second voltage difference.Described second
Low-pass filtering and range-adjusting circuit 2323 are for carrying out low pass to the signal of described three-hypers common-mode differential circuit 2321 output
Filtering and range-adjusting.Described 3rd low-pass filter circuit 2325 is for described second low-pass filtering and range-adjusting circuit
The signal of 2323 outputs carries out low-pass filtering, to obtain described first monolithic voltage signal S31.
Described 4th high common-mode differential circuit 2322 is for carrying out calculus of differences to described second voltage difference.Described second
High-pass filtering and reverse amplification circuit 2324 are for carrying out high pass to the signal of described 4th high common-mode differential circuit 2322 output
Filtering and reversely amplification.Described second low-pass filtering and range-adjusting circuit 2326 are used for described second high-pass filtering with reverse
The signal of amplifying circuit 2324 output carries out low-pass filtering and range-adjusting.Described 4th low-pass filter circuit 2328 is for institute
The signal stating the second low-pass filtering and range-adjusting circuit 2326 output carries out low-pass filtering, to obtain described second monolithic voltage
Signal S32.
Described 3rd signal processing module 24 is used for obtaining tertiary voltage, and this tertiary voltage difference is described electrochemistry to be measured
Voltage difference between energy storage device output head anode and negative pole, and this tertiary voltage difference is carried out signal condition to obtain
Three signal clusters.The present embodiment draws first voltage signal end at fuel cell whole heap output head anode, whole at fuel cell
Heap negative pole of output end draws second voltage signal end, and the first voltage signal end is higher than the voltage of the second voltage signal end, will
Two voltage signal end are connected to described 3rd signal processing module 24.3rd signal processing module 24 is analog circuit, institute
Stating tertiary voltage difference analog electrical signal after analog circuitry processes is the 3rd signal cluster, and the 3rd signal cluster is admitted to
Described control module 25.
Specifically, described 3rd signal processing module 24 carries out calculus of differences, low pass successively to described tertiary voltage difference
Filtering is with range-adjusting, low-pass filtering is to obtain the first voltage signal S41, and this tertiary voltage difference is carried out difference successively
Computing, high-pass filtering and reverse amplification, low-pass filtering and range-adjusting, low-pass filtering are to obtain the second voltage signal S42.Described
First voltage signal S41 is low frequency signal, is used for meeting output actual to described electrochemical energy storage device to be measured during steady operation
The monitoring of voltage, described second voltage signal S42 is the signal of changeable frequency, and its available frequency range is 0.1Hz ~ 5kHz, excellent
The frequency range of choosing is 0.1Hz ~ 1kHz.The synchronization to this second voltage signal S42 can be realized by the control of control module
Measure, when being used for meeting dynamic duty, when particularly carrying out ac impedance measurement, output actual to electrochemical energy storage device to be measured
The monitoring of voltage.This first voltage signal S41 and the second voltage signal S42 is collectively referred to as the 3rd signal cluster.It is appreciated that frequency model
The selection enclosed is affected by measurement pattern and the type of electrochemical energy storage device, working condition etc., only gives in the present embodiment
One optional scope, those skilled in the art can set corresponding frequency range as the case may be.
Referring to Fig. 3, described in the present embodiment, the 3rd signal processing module 24 includes: the 5th high common mode being sequentially connected in series is poor
Parallel circuit the 241, the 3rd low-pass filtering and range-adjusting circuit the 243, the 5th low-pass filter circuit 245；And be sequentially connected in series
Six high common-mode differential circuit the 242, the 3rd high-pass filterings and reverse amplification circuit the 244, the 3rd low-pass filtering and range-adjusting circuit
246, the 6th low-pass filter circuit 248.
Described 5th high common-mode differential circuit 241 is for carrying out calculus of differences to described tertiary voltage difference.Described 3rd
Low-pass filtering and range-adjusting circuit 243 are for carrying out low pass filtered to the signal of described 5th high common-mode differential circuit 241 output
Ripple and range-adjusting.Described 5th low-pass filter circuit 245 is for defeated to described 3rd low-pass filtering and range-adjusting circuit 243
The signal gone out carries out low-pass filtering, to obtain described first voltage signal S41.
Described 6th high common-mode differential circuit 242 is for carrying out calculus of differences to described tertiary voltage difference.Described 3rd
High-pass filtering and reverse amplification circuit 244 are for carrying out high pass filter to the signal of described 6th high common-mode differential circuit 242 output
Ripple and reversely amplification.Described 3rd low-pass filtering and range-adjusting circuit 246 are for described 3rd high-pass filtering and reversely putting
The signal of big circuit 244 output carries out low-pass filtering and range-adjusting.Described 6th low-pass filter circuit 248 is for described the
The signal of three low-pass filtering and range-adjusting circuit 246 output carries out low-pass filtering, to obtain described second voltage signal S42.
In the present embodiment, each signal processing module is during carrying out signal processing, particularly at ac impedance measurement
Under pattern, total for electrochemical energy storage device output voltage, output electric current, the parameter of each monomer voltage signal processing circuit can be entered
Row sum-equal matrix, such as processes circuit by each monomer voltage signal processing circuit and output current signal and is set to identical, to ensure signal
To process caused phase shift and amplitude scaling identical to being respectively sampled signal for processing module.The most described first electricity
Stream signal, described first monolithic signal, the phase shift of described first voltage signal experience scale identical with amplitude, and described second
Current signal, described second monolithic signal, the phase shift of described second voltage signal experience scale identical with amplitude.Thus can
With when being analyzed with computing impedance, ignore the signal processing module impact on being sampled signal, reduce signal analysis difficulty,
Improve signal analysis precision.
Described control module 25 receives described first current signal S21, the second current signal S22, the first monolithic signal
S31, the second monolithic signal S31, the first voltage signal S41, the second voltage signal S42, carry out mould by the above-mentioned signal received
Number conversion also sends peripheral control unit or host computer to.Described control module 25 is additionally operable to control described secondary signal processing module
The voltage sample of 23 pairs of described electrochemical energy storage device to be measured each energy storage monomers.
Control module 25 described in the present embodiment is by chip microcontroller.Referring to Fig. 5, described single-chip microcomputer includes: A/D changes
Submodule 251, communication submodule 252 and other guarantee single-chip microcomputers work and requisite assembly, such as CPU, regularly
Device, interruption, depositor and universal input/output interface etc..
Described A/D transform subblock 251 input pin and described first current signal S21, the second current signal S22, the
One monolithic signal S31, the second monolithic signal S31, the first voltage signal S41, the second voltage signal S42 are connected, and described A/D changes
Submodule 251 is for carrying out analog digital conversion to above-mentioned signal.
Described communication submodule 252, for carrying out communication with ambient controller or host computer, will change submodule via A/D
Voltage x current data after block 251 conversion are transferred to ambient controller or host computer, and described communication submodule 252 can use
CAN or FlexRay communication module.This CAN or FlexRay communication module inputs with communication signal, communication signal output is connected.
The digital output pin of single-chip microcomputer produces control signal, described control signal and signal gating submodule one a pair
Should.Total 2M signal gating submodule in the present embodiment, the digital output pin of single-chip microcomputer produces control signal 1 to control
Signal 2M, each control signal controls a signal gating submodule, it is achieved each monolithic output voltage of heap whole to fuel cell is adopted
The selection successively of sample.
Fuel cell whole heap output voltage and the synchronous acquisition of output electric current can be realized under the control of single-chip microcomputer, can realize
Fuel cell monolithic output voltage and the synchronous acquisition of whole heap output electric current.By communication module, it is achieved single-chip microcomputer and extraneous control
Information transmission between device processed or host computer, including target control signal, collects stable state and dynamic electric voltage current data etc..
In addition it is also necessary to external power source circuit provide to single-chip microcomputer and each signal processing module required for various surely
Fixed working voltage, such as numeral electricity 5V or 3.3V, simulation electricity positive and negative 15V or positive and negative 12V, simulation electricity 5V or 3.3V etc..
The voltage polling device that the present invention provides can be in electrochemical energy storage device be in stable state or dynamic process, to it
The output voltage of total output voltage, output electric current and each energy storage monomer carries out low-frequency sampling；Secondly, the voltage that the present invention provides
Inspection device can be total to it in electrochemical energy storage device is in dynamic process (particularly under ac impedance measurement pattern)
Output voltage, output electric current carry out high-frequency synchronous sampling, and the output electricity to energy storage monomer each in this electrochemical energy storage device
Pressure, electrochemical energy storage device always export electric current and carry out high-frequency synchronous sampling；3rd, under ac impedance measurement pattern, electrochemistry
The output voltage of total output voltage of energy storage device, output electric current and each energy storage monomer is all superimposed in its DC component
One AC compounent the faintest, it is faint that the signal processing module in the voltage polling device that the present invention provides can extract this
AC compounent, improve control module resolution time this AC compounent is sampled, and eliminate the impact of DC component.
It addition, those skilled in the art also can do other changes in spirit of the present invention, certainly, these are according to present invention essence
The change that god is done, within all should being included in scope of the present invention.
Claims (11)
1. a voltage polling device, for monitoring by the voltage electricity of the monomer series-connected electrochemical energy storage device formed of multiple energy storage
Stream signal, it is characterised in that this voltage polling device includes:
Current sampling resistor, is connected on during use in the output loop of electrochemical energy storage device to be measured；
First signal processing module, for obtaining the first voltage difference, and carries out signal condition to obtain to this first voltage difference
Obtaining the first current signal and the second current signal, wherein, this first voltage difference is the voltage at described current sampling resistor two ends
Difference, described first current signal is low frequency signal, and described second current signal is the signal of changeable frequency；
Secondary signal processing module, for obtaining the second voltage difference, and carries out signal condition to obtain to this second voltage difference
Obtaining the first monolithic signal and the second monolithic signal, wherein, this second voltage difference is single in described electrochemical energy storage device to be measured
The voltage difference of one energy storage monomer, described first monolithic signal is low frequency signal, and described second monolithic signal is changeable frequency
Signal；
3rd signal processing module, is used for obtaining tertiary voltage difference, and this tertiary voltage difference is carried out signal condition to obtain
Obtaining the first voltage signal and the second voltage signal, wherein, this tertiary voltage difference is the output of described electrochemical energy storage device to be measured
Rectifying the voltage difference between pole and negative pole, described first voltage signal is low frequency signal, and described second voltage signal is frequency
Variable signal；
Control module, is used for receiving described first current signal, described second current signal, described first monolithic signal, described
Second monolithic signal, described first voltage signal, described second voltage signal, and control described secondary signal processing module pair
The voltage of each energy storage monomer is sampled.
2. voltage polling device as claimed in claim 1, it is characterised in that described first signal processing module is to described first
Voltage difference carries out calculus of differences, low-pass filtering with range-adjusting, low-pass filtering successively to obtain the first current signal；And it is right
This first voltage difference carries out calculus of differences, high-pass filtering and reverse amplification, low-pass filtering and range-adjusting, low-pass filtering successively
To obtain the second current signal.
3. voltage polling device as claimed in claim 1, it is characterised in that described 3rd signal processing module is to the described 3rd
Voltage difference carries out calculus of differences, low-pass filtering with range-adjusting, low-pass filtering successively to obtain the first voltage signal；And it is right
This tertiary voltage difference carries out calculus of differences, high-pass filtering and reverse amplification, low-pass filtering and range-adjusting, low-pass filtering successively
To obtain the second voltage signal.
4. voltage polling device as claimed in claim 1, it is characterised in that described secondary signal processing module includes:
Signal gating submodule, gates single energy storage monomer to be measured under the effect of the control signal of control module output,
Obtain the second voltage difference；And
Signal processing submodule, for carrying out signal condition to obtain the first monolithic signal and the second list to this second voltage difference
Sheet signal.
5. voltage polling device as claimed in claim 4, it is characterised in that described signal processing submodule is to described second electricity
Pressure difference carries out calculus of differences, low-pass filtering with range-adjusting, low-pass filtering successively to obtain the first monolithic signal；And to this
Second voltage difference carry out successively calculus of differences, high-pass filtering and reversely amplify, low-pass filtering and range-adjusting, low-pass filtering with
Obtain the second monolithic signal.
6. voltage polling device as claimed in claim 4, it is characterised in that described signal gating submodule farther includes
Isolating chip, for isolating the forceful electric power signal of described energy storage monomer and the weak electric signal of described control module.
7. voltage polling device as claimed in claim 6, it is characterised in that described isolating chip is light-coupled isolation module or magnetic
Coupling isolation module.
8. voltage polling device as claimed in claim 1, it is characterised in that described control module farther includes:
A/D transform subblock, for described first current signal, described second current signal, described first monolithic signal, institute
State the second monolithic signal, described first voltage signal, described second voltage signal carry out analog digital conversion；And
Communication submodule, the voltage x current data after changing via described A/D transform subblock are transferred to external control
Device, and from described peripheral control unit reception order control described secondary signal processing module, the voltage of each energy storage monomer is carried out
Sampling.
9. voltage polling device as claimed in claim 8, it is characterised in that described communication submodule is that CAN or FlexRay leads to
News module.
10. voltage polling device as claimed in claim 1, it is characterised in that described energy storage monomer is fuel cell, lithium ion
At least one in battery and ultracapacitor.
11. voltage polling devices as claimed in claim 1, it is characterised in that described first current signal, described first monolithic
Signal, the phase shift of described first voltage signal experience scale identical with amplitude；And described second current signal, described
Two monolithic signals, the phase shift of described second voltage signal experience scale identical with amplitude.
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