CN105391116A - Battery vehicle-mounted charging-discharging device having health monitoring function - Google Patents
Battery vehicle-mounted charging-discharging device having health monitoring function Download PDFInfo
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- CN105391116A CN105391116A CN201510745164.1A CN201510745164A CN105391116A CN 105391116 A CN105391116 A CN 105391116A CN 201510745164 A CN201510745164 A CN 201510745164A CN 105391116 A CN105391116 A CN 105391116A
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- 230000036541 health Effects 0.000 title claims abstract description 28
- 238000012544 monitoring process Methods 0.000 title claims abstract description 25
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- 238000012545 processing Methods 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims description 14
- 238000004891 communication Methods 0.000 claims description 7
- 230000003862 health status Effects 0.000 claims description 4
- 230000002159 abnormal effect Effects 0.000 claims description 3
- 230000002457 bidirectional effect Effects 0.000 abstract description 4
- 230000005284 excitation Effects 0.000 abstract 1
- 230000006870 function Effects 0.000 description 9
- 238000012360 testing method Methods 0.000 description 7
- 239000003208 petroleum Substances 0.000 description 6
- 230000006837 decompression Effects 0.000 description 4
- 239000003921 oil Substances 0.000 description 4
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- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
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- 238000010792 warming Methods 0.000 description 1
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Classifications
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- H02J7/0022—
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/20—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by converters located in the vehicle
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
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- H02J7/0021—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
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- H02J7/027—
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Tests Of Electric Status Of Batteries (AREA)
Abstract
The invention relates to a battery vehicle-mounted charging-discharging device having a health monitoring function. The battery vehicle-mounted charging-discharging device comprises a monitoring and control unit, a bidirectional power conversion unit, and a rectification circuit. A square signal is superposed on a battery charging or discharging target value by the monitoring and control unit; on the basis of a difference between the signal and an actual current, duty ratios of IGBTs in the bidirectional power conversion unit are calculated and connection or disconnection of the IGBTs are controlled by a PWM drive unit, so that the battery charging or discharging current is consistent with the superposed signal. A signal collection and processing unit transmits a collected signal to an FPGA; the FPGA carries out fast fourier transform on received battery currents and all battery voltages to convert current and voltage signals into sums of direct-current components and alternating-current components with different frequencies; the FPGA carries out calculation to obtain battery impedances under different frequencies; and the battery impedances are compared with impedance values when products leave the factory, thereby determining heath states of all batteries. According to the invention, the circuit is simple and concise; and the structure is compact. The battery health monitoring and charging-discharging control are combined into one, thereby eliminating alternating-current excitation current sources needed by the traditional health monitoring system.
Description
Technical field
The invention belongs to a kind of Car Battery charge-discharge machine, particularly a kind of Car Battery charge-discharge machine with health monitoring function.
Background technology
Energy shortage, environmental pollution, climate warming are the common challenges of global energy field face.Since entering 21 century, increasingly exhausted along with the non-renewable energy resources such as oil, coal, environmental pollution is day by day serious, has energy-conservationly become countries in the world two large problems urgently to be resolved hurrily with environmental protection.
According to the data of USDOE subordinate energy intelligence administration, global demand of petroleum amount in 2012 is 8,905 ten thousand barrel per days; The report in Swiss Bank end of the year in 2012 claim the current world to confirm petroleum reserves has 1.8 trillion barrels, this means the petroleum reserves by existing oil consumption level and current confirmation, world oil also can exploit 46 years.International Energy Agency prediction [1], to 2035,12,000,000,000 tons of Petroleum Equivalents from 2009 were increased to 170-180 hundred million tons of Petroleum Equivalents by whole world year energy demand; CO2 emission aspect, if keep current discharge policy, discharge capacity rises to 43,000,000,000 tons by from 2009 29,000,000,000 tons, even if adopt new rule, discharge capacity also can rise to 36,000,000,000 tons.Motor vehicle emission accounts for 1/4th of total discharge.
Current China has become the second in the world energy resource consumption big country.Within 2012, consume petroleum 4.93 hundred million tons, crude oil external dependence degree is 56.42%, reaches historic high, expects the year two thousand thirty, and the oil of China 80% is by dependence on import, and energy security problem is increasingly serious.On Copenhagen United Nations Climate Change Conference of holding on December 7th, 2009, the Chinese government reiterated the non-fossil energy of the year two thousand twenty account for primary energy consumption ratio weigh about 15% target, and first the year two thousand twenty being proposed to, the GDP CO2 emission of unit of China is than the reduction of discharging plan of decline 40%-45% in 2005.And China is in the economical operation state of higher carbon equivalent under industrialization background, realizes subtracting carbon target and shoulder heavy responsibilities.In October, 2013, Ministry of Industry and Information is energy-conservation to be represented with comprehensive utilization department official, and China has been CO2 emission first big country, and increment also accounts for more than 70% of the whole world, and the carbon reduction increasing pressure faced in the world is large.Therefore, Development of EV is the only way of automotive engineering of future generation, and battery is again one of critical component of electric automobile.
In battery applications process, ensure that the fail safe in its charging, discharge process is the matter of utmost importance needing to solve.Vehicle-mounted charge-discharge machine is absolutely necessary, and also must carry out health monitoring to battery.Internal resistance is one of key parameter weighing cell health state.Therefore, in order to ensure safety, stable, Effec-tive Function, must monitor in real time each single slice battery essential resistance.But because the internal resistance of cell can be capacitive, perception and purely resistive, monolithic internal resistance size is m Ω level, and has time variation, monitoring difficulty is very large.
At present, battery charging and discharging machine and health monitor are generally 2 autonomous devices, realize discharge and recharge and health monitoring function respectively.Internal resistance test device generally can not work online, need the alternating current driving source being equipped with wide frequency ranges, for battery provides interchange disturbing signal, also need the complex instrument such as battery testing platform, electronic load, frequency analyzer, this makes such test platform very complicated, volume is large, weight is large, cost is high, and it is very high to be not easy to on-board running cost, can only test in laboratory environments.Ontario, Canada Hydrogenics Corp patent WO02/27342 and WO2003/083498, put on airs Greenlight Power Technologies of British Columbia patent WO2003/098769, by carrying out test battery internal resistance to the control of electronic load, because actual battery institute bringing onto load can not control by test request, so their method can not carry out on-line testing.
Summary of the invention
The object of the present invention is to provide a kind of simple, reliable, can the Car Battery charge-discharge machine of band health monitoring function of vehicle-mounted use, to overcome the deficiency of existing equipment.
To achieve these goals, the technical solution adopted in the present invention is:
A kind of Car Battery charge-discharge machine with health monitoring function, comprise at least one Inspect and control unit, bi-directional power conversion unit, rectification circuit, described bi-directional power conversion unit is used for connecting tested battery pack and DC bus respectively, rectification circuit is for connecting electrical network and DC bus, be characterized in: described Inspect and control unit comprises Signal acquiring and processing unit, FPGA, DSP, PWM driver element and CAN communication interface, described Signal acquiring and processing unit input gathers described battery cell electric current, each monolithic battery voltage and bi-directional power conversion unit both end voltage and current signal, the output of described Signal acquiring and processing unit is connected by FPGA and DSP, described DSP controls described bi-directional power conversion unit by PWM driver element, described DSP realizes communication by CAN communication interface and outside.
Based on the Car Battery charge-discharge machine of above-mentioned band health monitoring function, the present invention also provides a kind of control method of the Car Battery charge-discharge machine with health monitoring function, and its control method is:
Described Inspect and control unit superposes a square-wave signal in battery charge or discharge desired value, difference based on this signal and actual current calculates the duty ratio of IGBT in bi-directional power conversion unit, through the break-make of PWM driver element control IGBT, make battery charge or discharge electric current consistent with superposed signal; FPGA carries out fast Fourier transform to the battery current received and each cell voltage, electric current and voltage signal is converted to DC component and different frequency alternating current component sum; FPGA, by the current component of the component of voltage of each each frequency of battery divided by same frequency, obtains the next battery impedance of each frequency, and compares with resistance value when dispatching from the factory, judge the health status of each battery according to this.
Above-mentioned on battery charge or discharge desired value electric current superpose a square-wave signal, square wave amplitude is not more than 5% of battery target current effective value, and square wave frequency is fundamental frequency, is set as 1kHz.
In described bi-directional power conversion unit, the break-make of four IGBT has multiple combination pattern, battery pack can be realized by various combination to power to DC bus powered, step-down, electrical network or DC bus are to battery pack boost charge, step-down charging, IGBT210 normal open, IGBT220 and IGBT230 normal off, IGBT240 is with certain duty ratio break-make, then battery pack is to DC bus boosting power supply; IGBT220, IGBT230 and IGBT240 normal off, IGBT210 is with certain duty ratio break-make, then battery pack is powered to DC bus step-down; IGBT230 normal open, IGBT210 and IGBT240 normal off, IGBT220 is with certain duty ratio break-make, then electrical network or DC bus fill to battery pack boosting; IGBT210, IGBT220 and IGBT240 normal off, IGBT230 is with certain duty ratio break-make, then electrical network or DC bus charge to battery pack step-down.
Battery pack, to working in boosting or step-down time DC bus powered, depends on the size of battery pack and DC bus-bar voltage.If battery voltage is higher than DC bus-bar voltage, decompression mode should be worked in; If battery voltage is lower than DC bus, then boost mode should be worked in.During charging, if battery voltage is higher than DC bus-bar voltage, boost mode should be worked in; Otherwise, should decompression mode be worked in.
Signal after above-mentioned DSP based target electric current superposition square wave and the difference of actual current calculate the duty ratio of IGBT in bi-directional power conversion unit, through the break-make of PWM driver element control IGBT, make battery charge or discharge electric current consistent with superposed signal; Signal acquiring and processing unit Real-time Collection battery current, each monolithic battery voltage, bi-directional power conversion unit both end voltage and electric current, be sent to FPGA by collection value.
Above-mentioned FPGA carries out fast Fourier transform to the battery current received and each cell voltage, electric current and voltage signal is converted to DC component and different frequency alternating current component sum.FPGA, by the current component of the component of voltage of each each frequency of battery divided by same frequency, obtains the next battery impedance of each frequency, and compares with resistance value when dispatching from the factory, judge the health status of each battery according to this.
Battery current is transformed to:
Wherein, I
0for DC component, ω is fundamental frequency, and i represents harmonic number, α
ifor i subharmonic phase angle, I
ifor i subharmonic amplitude.
Kth sheet cell voltage is transformed to:
Wherein, U
k, 0for kth sheet cell voltage DC component, β
k, ifor i subharmonic phase angle, U
k, ifor i subharmonic voltage amplitude.
Then the DC impedance of kth sheet battery is:
The impedance of kth sheet battery when frequency is i ω is:
The Car Battery charge-discharge machine of above-mentioned band health monitoring function to dispatch from the factory setting parameter internal resistance threshold value according to battery, when the internal resistance threshold value detected is greater than set point, judges that cell health state is abnormal.Inspect and control unit is by CAN communication interface and extraneous interactive information.
The present invention compared with prior art, Car Battery charger and health monitor are united two into one, eliminate that high accuracy is high, the alternating current driving source of wide frequency ranges, reduce volume, weight and cost, and in charge and discharge process, normal battery operation can not affected by on-line monitoring cell health state.
Accompanying drawing explanation
Fig. 1 is structural principle block diagram of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail, but this embodiment should not be construed as limitation of the present invention.
The present invention includes Inspect and control unit, bi-directional power conversion unit, rectification circuit, tested battery pack is connected with one end of bidirectional power converter, the other end of bidirectional power converter is connected with DC bus, and electrical network is also connected with DC bus after rectification circuit.
Inspect and control unit superposes a square-wave signal in battery charge or discharge desired value:
I
in(t)＝I
req(t)+f(t)(1)
Wherein, I
reqt () is batteries charging or discharge target value.I
reqt () > 0 is discharge target value, I
reqt () < 0 is charge target value.F (t) is the square wave of superposition, and its amplitude is I
req(t) 5%, frequency is 1kHz.
Superposition square wave is that it is equivalent to multiple frequency sine signal sum because the frequency content of square wave is very abundant.Therefore, add square wave and be namely equivalent to the sinusoidal signal adding multiple different frequency in electric current.
The break-make of four IGBT in bi-directional power conversion unit has multiple combination pattern, can realize battery pack power to DC bus boosting power supply, step-down by various combination, and electrical network or DC bus are to battery pack boost charge, step-down charging.IGBT210 normal open, 220 and 230 normal offs, 240 with certain duty ratio break-make, then battery pack is to DC bus boosting power supply; IGBT220,230 and 240 normal offs, 210 with certain duty ratio break-make, then battery pack is powered to DC bus step-down; IGBT230 normal open, 210 and 240 normal offs, 220 with certain duty ratio break-make, then electrical network or DC bus fill to battery pack boosting; IGBT210,220 and 240 normal offs, 230 with certain duty ratio break-make, then electrical network or DC bus charge to battery pack step-down.
Battery pack, to working in boosting or step-down time DC bus powered, depends on the size of battery pack and DC bus-bar voltage.If battery voltage is higher than DC bus-bar voltage, decompression mode should be worked in; If battery voltage is lower than DC bus, then boost mode should be worked in.During charging, if battery voltage is higher than DC bus-bar voltage, boost mode should be worked in; Otherwise, should decompression mode be worked in.
When working in charge mode, by other power supplys on DC bus to batteries charging, or by electrical network to batteries charging, determined by the relay 320 in rectification circuit 300.In vehicle travel process, DSP control relay 320 disconnects, by other power supplys on DC bus to batteries charging; During vehicle parking, DSP monitors rectification circuit input end access electrical network, then disconnect other power supplys on DC bus, turn-on relay 320, by electrical network after rectification to batteries charging.
Signal I after DSP based target electric current superposition square wave in Inspect and control unit
int () calculates the duty ratio of IGBT in bi-directional power conversion unit with the difference of actual current, through the break-make of PWM driver element control IGBT, make battery charge or discharge electric current consistent with superposed signal.Signal acquiring and processing unit Real-time Collection battery current, each monolithic battery voltage, bi-directional power conversion unit both end voltage and electric current, be sent to FPGA by collection value.
FPGA carries out fast Fourier transform to the battery current received and each cell voltage, electric current and voltage signal is converted to DC component and different frequency alternating current component sum.FPGA, by the current component of the component of voltage of each each frequency of battery divided by same frequency, obtains the next battery impedance of each frequency.
Battery current is transformed to:
Wherein, I
0for DC component, ω is fundamental frequency, and i represents harmonic number, α
ifor i subharmonic phase angle, I
ifor i subharmonic amplitude.
Kth sheet cell voltage is transformed to:
Wherein, U
k, 0for kth sheet cell voltage DC component, β
k, ifor i subharmonic phase angle, U
k, ifor i subharmonic voltage amplitude.
Then the DC impedance of kth sheet battery is:
The impedance of kth sheet battery when frequency is i ω is:
In formula (2)-(3), get n=100, namely the value of i is 1,2,3 ..., 100.Because square wave frequency is 1kHz, so, can 1kHz be calculated, 2kHz, 3kHz ..., the impedance of each monolithic battery and DC impedance during 100kHz.According to battery behavior, 100kHz and following impedance can describe battery impedance completely.
After calculating each battery impedance, to dispatch from the factory setting parameter impedance threshold according to battery, when the impedance threshold detected is greater than set point, judge that cell health state is abnormal.
The content be not described in detail in this specification belongs to the known prior art of professional and technical personnel in the field.
Claims (8)
1. the Car Battery charge-discharge machine with health monitoring function, comprise at least one Inspect and control unit, bi-directional power conversion unit, rectification circuit, described bi-directional power conversion unit is used for connecting tested battery pack and DC bus respectively, rectification circuit is for connecting electrical network and DC bus, it is characterized in that: described Inspect and control unit comprises Signal acquiring and processing unit, FPGA, DSP, PWM driver element and CAN communication interface, described Signal acquiring and processing unit input gathers described battery cell electric current, each monolithic battery voltage and bi-directional power conversion unit both end voltage and current signal, the output of described Signal acquiring and processing unit is connected by FPGA and DSP, described DSP controls described bi-directional power conversion unit by PWM driver element, described DSP realizes communication by CAN communication interface and outside.
2. utilize the Car Battery charge-discharge machine of the band health monitoring function described in claim 1, its control method is: described Inspect and control unit superposes a square-wave signal in battery charge or discharge desired value, difference based on this signal and actual current calculates the duty ratio of IGBT in bi-directional power conversion unit, through the break-make of PWM driver element control IGBT, make battery charge or discharge electric current consistent with superposed signal; FPGA carries out fast Fourier transform to the battery current received and each cell voltage, electric current and voltage signal is converted to DC component and different frequency alternating current component sum; FPGA, by the current component of the component of voltage of each each frequency of battery divided by same frequency, obtains the next battery impedance of each frequency, and compares with resistance value when dispatching from the factory, judge the health status of each battery according to this.
3. the control method of the Car Battery charge-discharge machine of band health monitoring function as claimed in claim 2, it is characterized in that: on battery charge or discharge desired value electric current, superpose a square-wave signal, square wave amplitude is not more than 5% of battery target current effective value, square wave frequency is fundamental frequency, is set as 1kHz.
4. the control method of the Car Battery charge-discharge machine of band health monitoring function as claimed in claim 2, it is characterized in that: in described bi-directional power conversion unit, the break-make of four IGBT has multiple combination pattern, can realize battery pack by various combination to power to DC bus boosting power supply, step-down, electrical network or DC bus are to battery pack boost charge, step-down charging; IGBT210 normal open, IGBT220 and IGBT230 normal off, IGBT240 is with certain duty ratio break-make, then battery pack is to DC bus boosting power supply; IGBT220, IGBT230 and IGBT240 normal off, IGBT210 is with certain duty ratio break-make, then battery pack is powered to DC bus step-down; IGBT230 normal open, IGBT210 and IGBT240 normal off, IGBT220 is with certain duty ratio break-make, then electrical network or DC bus are to battery pack boost charge; IGBT210, IGBT220 and IGBT240 normal off, IGBT230 is with certain duty ratio break-make, then electrical network or DC bus charge to battery pack step-down.
5. the control method of the Car Battery charge-discharge machine of band health monitoring function as claimed in claim 2, it is characterized in that: the signal after DSP based target electric current superposition square wave and the difference of actual current calculate the duty ratio of IGBT in bi-directional power conversion unit, through the break-make of PWM driver element control IGBT, make battery charge or discharge electric current consistent with superposed signal; Signal acquiring and processing unit Real-time Collection battery current, each monolithic battery voltage, bi-directional power conversion unit both end voltage and electric current, be sent to FPGA by collection value.
6. the control method of the Car Battery charge-discharge machine of band health monitoring function as claimed in claim 1, it is characterized in that: FPGA carries out fast Fourier transform to the battery current received and each cell voltage, electric current and voltage signal are converted to DC component and different frequency alternating current component sum, FPGA is by the current component of the component of voltage of each each frequency of battery divided by same frequency, obtain the next battery impedance of each frequency, and compare with resistance value when dispatching from the factory, judge the health status of each battery according to this.
7. the control method of the Car Battery charge-discharge machine of band health monitoring function as claimed in claim 6, is characterized in that:
Described battery current is transformed to:
Wherein, I
0for DC component, ω is fundamental frequency, and i represents harmonic number, α
ifor i subharmonic phase angle, I
ifor i subharmonic amplitude.
Described kth sheet cell voltage is transformed to:
Wherein, U
k, 0for kth sheet cell voltage DC component, β
k, ifor i subharmonic phase angle, U
k, ifor i subharmonic voltage amplitude.
Then the DC impedance of kth sheet battery is:
The impedance of kth sheet battery when frequency is i ω is:
。
8. the control method of the Car Battery charge-discharge machine of band health monitoring function as claimed in claim 2, is characterized in that: to dispatch from the factory setting parameter impedance threshold according to battery, when the impedance threshold detected is greater than set point, judge that cell health state is abnormal.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106126387A (en) * | 2016-06-16 | 2016-11-16 | 中能易电新能源技术有限公司 | Intelligent digital power supply and the method and apparatus that it is monitored |
| CN106788063A (en) * | 2017-02-28 | 2017-05-31 | 南京航空航天大学 | Motor load mechanical impedance it is online from sensing detection method and system |
| WO2019037033A1 (en) * | 2017-08-24 | 2019-02-28 | 海门市品格工业设计有限公司 | Electric vehicle direct-current charger based on dsp_cpld control |
| CN110098742A (en) * | 2019-06-01 | 2019-08-06 | 深圳市永航新能源技术有限公司 | The application of synchronous rectification DC/DC converter |
| CN110297130A (en) * | 2019-06-12 | 2019-10-01 | 合肥工业大学 | A kind of DC/DC converter and internal resistance measurement method with internal resistance of fuel cell measurement function |
| CN111175594A (en) * | 2019-10-31 | 2020-05-19 | 北京交通大学 | Method for monitoring residual life of direct current double-support capacitor of fully-controlled alternating current-direct current-alternating current system |
| CN114236408A (en) * | 2021-12-17 | 2022-03-25 | 西南交通大学 | Controllable broadband impedance measuring method and device for lithium battery |
| US11644513B1 (en) | 2022-01-07 | 2023-05-09 | Hong Kong Applied Science and Technology Research Institute Company Limited | Real-time AC-impedance inspection using limited-energy on-board AC excitation for battery management system |
| CN116774768A (en) * | 2023-08-22 | 2023-09-19 | 深圳市德兰明海新能源股份有限公司 | Power tracking method and system for channel multiplexing energy storage power supply |
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| CN106788063B (en) * | 2017-02-28 | 2019-05-07 | 南京航空航天大学 | Motor load mechanical impedance it is online from sensing detection method and system |
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| CN116774768A (en) * | 2023-08-22 | 2023-09-19 | 深圳市德兰明海新能源股份有限公司 | Power tracking method and system for channel multiplexing energy storage power supply |
| CN116774768B (en) * | 2023-08-22 | 2024-02-06 | 深圳市德兰明海新能源股份有限公司 | Power tracking method and system for channel multiplexing energy storage power supply |
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