CN106019160B - A kind of battery management system and detection method of the electric car with AC internal Resistance inspection - Google Patents
A kind of battery management system and detection method of the electric car with AC internal Resistance inspection Download PDFInfo
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- CN106019160B CN106019160B CN201610316975.4A CN201610316975A CN106019160B CN 106019160 B CN106019160 B CN 106019160B CN 201610316975 A CN201610316975 A CN 201610316975A CN 106019160 B CN106019160 B CN 106019160B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
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- General Physics & Mathematics (AREA)
- Tests Of Electric Status Of Batteries (AREA)
- Secondary Cells (AREA)
Abstract
A kind of battery management system the invention discloses electric car with AC internal Resistance inspection, including AC module, cell circuit module, data acquisition module and main control unit module.Battery management system controls pumping signal module by main control unit module and generates external generation sinusoidal excitation signal, sinusoidal excitation signal is injected to cell circuit module, analyzed and calculated the internal resistance of battery by the information in data collecting module collected cell circuit module, the detection of battery AC internal Resistance judges that battery is damage or sampling harness broken string；When harness broken string, battery management system will not report cell damage by mistake, so that battery management system diagnosis is relatively reliable.
Description
Technical field
The present invention and batteries of electric automobile field, in particular to a kind of battery management of the electric car with AC internal Resistance inspection
System and method.
Background technique
With the popularization of new-energy automobile, the safety of battery management system more and more attention has been paid to.The electricity of mainstream at present
Pond management system monitors battery pack total voltage samples the voltage of every string battery core, and control is balanced when Voltage unbalance, estimates battery pack
SOC value；SOC, full name are State of Charge, and state-of-charge is also remaining capacity, and representative is that battery uses one section
Time or for a long time lie idle after residual capacity and its fully charged state capacity ratio, commonly use percentage indicate；Electricity
The internal resistance of the core parameter critically important as one, the internal resistance of battery core can be used for assessing battery health degree, battery life estimation with
And system SOC estimation is carried out, it also can be used as the assessment whether battery damages, still, only done when battery core factory
Battery core sorting, selects the preferable battery core of consistency to produce battery pack, does not just continue concern electricity after battery pack is produced
In-core hinders parameter.
Summary of the invention
The present invention is in order to solve the above technical problems, provide a kind of electric car band exchange for detecting batteries of electric automobile internal resistance
The battery management system of internal resistance inspection.
In order to solve the above technical problems, the technical solution adopted by the present invention are as follows:
A kind of battery management system of the electric car with AC internal Resistance inspection, including pumping signal module, cell circuit mould
Block, data acquisition module and main control unit module；
Pumping signal module includes digital analog converter, voltage amplifier circuit and isolating transformer, the digital simulation
The input terminal of converter connects main control unit module, the output end connection voltage amplifier circuit of the digital analog converter
Input terminal, primary one end of the output end connection isolating transformer of the voltage amplifier circuit, the primary of the isolating transformer
Other end ground connection；
The cell circuit module includes battery pack, relay and shunt resistance, and the battery pack is by multiple battery cells
Be composed in series, the battery pack, transformer secondary output and shunt resistance are connected in series to form cell circuit, the battery pack both ends with
And relay is connected in parallel between each battery cell respectively, odd bits relay is connected in parallel to form the first tie point, even bit
Relay is connected in parallel to form the second tie point, and the controlled end of the relay connects main control unit module；
The data sampling module includes the first operational amplifier, second operational amplifier, analog-digital converter sum number
Word isolator, the input terminal of first operational amplifier are connected in parallel on shunt resistance two sides, the second operational amplifier it is defeated
Enter end and is separately connected the first tie point and the second tie point, the output end of first operational amplifier and second operational amplifier
It is connected to the input terminal of analog-digital converter, the output end of the analog-digital converter is connected to digital isolator
The output end of input terminal, the digital isolator connects main control unit module.
The medicine have the advantages that
Battery management system controls pumping signal by main control unit module and generates external generation sinusoidal excitation signal, to
Cell circuit module injects sinusoidal excitation signal, is analyzed by the information in data collecting module collected cell circuit module
And the internal resistance of battery is calculated, the SOC value of battery pack, battery AC internal Resistance can be calculated by the internal resistance of the battery cell in battery pack
Detection come judge battery be damage or sampling harness broken string；When harness broken string, battery management system will not be reported by mistake
Cell damage so that battery management system diagnosis is relatively reliable.
As a kind of preferred structure of the invention, influenced to reduce direct current to the alternating current in cell circuit module, institute
Stating in cell circuit module further includes capacitor, and the capacitor is connected in series in the cell circuit.Capacitor have indirect current every
The effect of direct current increases capacitor in cell circuit, and reducing direct current influences the alternating current in circuit.
Service life to increase relay as a kind of preferred structure of the invention, the relay be optocoupler after
Electric appliance.Light coupling relay is not in electric shock abrasion without mechanical contact, and service life is unlimited.
It is described in order to when not detecting, reduce influence of the alternating current to battery pack as a kind of preferred structure of the invention
Switch is additionally provided in the circuit that battery pack and transformer secondary output, shunt resistance are formed, the controlled end of the switch connects main control
Unit.By the way that switch is arranged in the loop, when not detecting, main control unit control switch is disconnected, and avoids alternating current to battery
The influence of packet.
As a kind of preferred structure of the invention, in order to avoid direct current has an impact data acquisition, first fortune
The positive input and reverse input end for calculating amplifier are connected separately with capacitance, and the forward direction of the second operational amplifier is defeated
Enter end and reverse input end is connected separately with capacitance.By in the positive input for acquiring the operational amplifier of data and instead
It is respectively equipped with capacitance to input terminal, direct current is reduced and data acquisition is had an impact.
A kind of detection method of battery management system present invention provides electric car with AC internal Resistance inspection, this hair
The technical solution of bright use are as follows:
A kind of detection method of battery management system of the electric car with AC internal Resistance inspection, comprising:
Step 1: the main control unit module control pumping signal module generates sinusoidal excitation signal injection battery and returns
Road；
Step 2: the main control unit module is closed the relay of first battery cell two sides；
Step 3: first operational amplifier acquires the signal message on shunt resistance and passes through analog-digital converter
It is sent to main control unit；
Step 4: the second operational amplifier, which acquires the signal message on present battery monomer and passes through simulation numeral, to be turned
Parallel operation is sent to main control unit module；
Step 5: the main control unit carries out data analysis and calculates to work as according to the signal message of analog-digital converter
The internal resistance of preceding battery cell；
Step 6: the main control unit module disconnects the relay of present battery monomer two sides, and is closed next electricity
The relay of pond monomer two sides repeats step 3 to step 5, up to main control unit module analysis and calculates the last one electricity
The internal resistance of pond monomer.
The medicine have the advantages that generating sinusoidal ac signal by external, sinusoidal excitation signal is injected to cell circuit,
AC internal Resistance is measured to the response of sinusoidal excitation signal using battery pack, so that battery management system will not report battery damage by mistake
It is bad so that battery management system diagnosis is relatively reliable.
It advanced optimizes, in order to reduce unnecessary loss, the main control unit modular spacing preset time is to battery
Packet is detected.Battery pack is detected by main control unit module preset time, constant testing is reduced and contracts for fixed output quotas to battery
Raw loss.
It advanced optimizes, in order to detect as needed to battery cell, the main control unit module receives external
Internal resistance detection instruction, and instructed according to external internal resistance detection to each battery cell, single battery monomer or certain battery lists
Body is detected.By the way that external internal resistance detection instruction is arranged, according to it is different need to input main control unit module it is different
Internal resistance detection instruction, detects each battery cell, single battery monomer or multiple battery cells.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of battery management system of the electric car of the present invention with AC internal Resistance inspection；
Fig. 2 is a kind of circuit diagram of battery management system of the electric car of the present invention with AC internal Resistance inspection；
Fig. 3 is the flow diagram of detection method of the electric car of the present invention with AC internal Resistance inspection.
Specific embodiment
In order to describe the technical content, the structural feature, the achieved object and the effect of this invention in detail, below in conjunction with embodiment
And attached drawing is cooperated to be explained in detail.
Please refer to Fig. 1 and Fig. 2, battery management system of the electric car of the present invention with AC internal Resistance inspection, including exchange
Electric module 101, cell circuit module 102, data acquisition module 103 and main control unit module 104；Main control unit module
104 include main control unit MCU, and AC module 101 includes that digital analog converter DAC, voltage amplifier circuit and isolation become
The input terminal of depressor T, the digital analog converter DAC connect main control unit MCU, the digital analog converter DAC's
Output end connects the input terminal of voltage amplifier circuit, the primary T1 of the output end connection isolating transformer of the voltage amplifier circuit
One end, the primary T1 other end ground connection of the isolating transformer；The cell circuit module 102 includes battery pack, relay K1-
N and shunt resistance R1, the battery pack are composed in series by multiple battery cells, the battery pack, transformer secondary output T2 and shunting
Resistance R1 is connected in series to form circuit, is connected in parallel relay respectively between the battery pack both ends and each battery cell, odd
Numerical digit relay is connected in parallel to form the first tie point, and even bit relay is connected in parallel to form the second tie point, the relay
The controlled end of device Cell1-n connects main control unit MCU；The data sampling module 103 include the first operational amplifier OP-1,
Second operational amplifier OP-2, analog-digital converter ADC and digital isolator ADUM, the first operational amplifier OP-1's
Input terminal is connected in parallel on the two sides shunt resistance R1, the input terminal of the second operational amplifier OP-2 be separately connected the first tie point and
The output end of second tie point, the first operational amplifier OP-1 and second operational amplifier OP-2 are connected to simulation number
The output end of the input terminal of word converter ADC, the analog-digital converter ADC is connected to the input of digital isolator ADUM
The output end at end, the digital isolator ADUM connects main control unit MCU.It further include electricity in the cell circuit module 102
Hold, the capacitor connects to form cell circuit with the secondary T2 of battery pack, shunt resistance R1 and isolating transformer T；The relay
Device K1-Kn+1 is light coupling relay；In the circuit that the battery pack and T grade T2 of isolating transformer, shunt resistance R1 are formed also
Equipped with switch K, the controlled end of the switch K connects main control unit MCU；The primary T1 is connected in parallel to resistance
One end of R2, the resistance R2 connect digital analog converter DAC output end, the other end ground connection of the resistance R2.
The main control unit MCU of battery management system is communicated by SPI sends digital signal to digital analog converter
DAC, digital analog converter DAC export sine wave signal, are connected by emitter follower and generate sine wave friendship above resistance R4
Flow voltage signal.Ac voltage signal passes through primary T1, the secondary T2 of transformer T, and AC sine wave voltage is formed on T2
Excitation.Main control unit MCU controls K, and K1, K2 relay closure, other relays disconnect, for ac-excited, n string
Battery Cell is equivalent to n string battery AC internal Resistance series connection, and capacitor C is equivalent to short circuit.Then ac-excited voltage source is to shunt resistance R
And n goes here and there the load discharge of concatenated AC internal Resistance composition.The electricity at the both ends current divider R is sampled by the first operational amplifier OP-1
It presses signal I (t) and samples the voltage signal U (t), the AD of sampling at the both ends battery cell1 by second operational amplifier OP-2
Value issues main control unit MCU by digital isolator.Available voltage of the load on battery cell1 AC resistance and
By electric current, so that it may calculate the AC internal Resistance of cell1.After obtaining first segment AC internal Resistance, main control unit MCU is opened
K1, closes K3, and the same above step that repeats obtains cell2 AC internal Resistance.For n string battery, battery management system is only
The alternating current voltage sampling of different batteries is successively opened, and main control unit MCU processing is dealt by digital isolator, so that it may
Obtain its specific AC internal Resistance formula of the AC internal Resistance of n string battery are as follows:
Current signal: I=I0Sin (ω T+ φ 1)/R1
Voltage signal: U=U0Sin (ω T+ φ 2)
AC internal Resistance R=U0/I0*ej φ
Phase difference=φ 2- φ 1.
As shown in figure 3, battery management system of a kind of electric car of another scheme with AC internal Resistance inspection of the invention
Detection method, comprising:
Step 1 301: the main control unit module control pumping signal module generates sinusoidal excitation signal and injects battery
Circuit；
Step 2 302: the main control unit module is closed the relay of first battery cell two sides；
Step 3 303: first operational amplifier, which acquires the signal message on shunt resistance and passes through simulation numeral, to be turned
Parallel operation is sent to main control unit；
Step 4 304: the second operational amplifier acquires the signal message on present battery monomer and by simulation number
Word converter is sent to main control unit module；
Step 5 305: the main control unit carries out data analysis according to the signal message of analog-digital converter and counts
Calculate the internal resistance of present battery monomer；
Step 6 306: the main control unit module disconnects the relay of present battery monomer two sides, and is closed next
The relay of battery cell two sides repeats step 3 to step 5, up to main control unit module analysis and calculates the last one
The internal resistance of battery cell.
Digital signal is sent to the digital analog converter of pumping signal module in main control unit module, digital simulation turns
Parallel operation converts digital signals into sinusoidal excitation signal, and is amplified by signal amplification circuit, then pass through isolating transformer
Sinusoidal excitation signal is injected in cell circuit module, by being closed corresponding relay, control data collecting module collected electricity
It is every to carry out analytical calculation according to the signal message of acquisition for the signal message of shunt resistance and each battery cell in the return circuit module of pond
The internal resistance of a battery cell.
In the present embodiment, the main control unit modular spacing preset time detects battery pack, passes through master control
Unit module preset time processed detects battery pack, reduces constant testing and generates loss to battery pack；The main control list
Element module receives external internal resistance detection instruction, and is instructed according to external internal resistance detection to each battery cell, single battery monomer
Or certain battery cells are detected.By the way that external internal resistance detection instruction is arranged, needed according to different to main control unit
Module inputs different internal resistance detection instructions, examines to each battery cell, single battery monomer or multiple battery cells
It surveys.
The above description is only an embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalent structure or equivalent flow shift made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant skills
Art field, is included within the scope of the present invention.
Claims (8)
1. a kind of battery management system of electric car with AC internal Resistance inspection, which is characterized in that including pumping signal module, electricity
Pond return circuit module, data acquisition module and main control unit module；
Pumping signal module includes digital analog converter, voltage amplifier circuit and isolating transformer, the digital-to-analogue conversion
The input terminal of device connects main control unit module, the input of the output end connection voltage amplifier circuit of the digital analog converter
End, primary one end of the output end connection isolating transformer of the voltage amplifier circuit, the primary of the isolating transformer are another
End ground connection；
The cell circuit module includes battery pack, relay and shunt resistance, and the battery pack is connected by multiple battery cells
Composition, the battery pack, transformer secondary output and shunt resistance are connected in series to form cell circuit, battery pack both ends and each
Relay is connected in parallel between battery cell respectively, odd bits relay is connected in parallel to form the first tie point, even bit relay
Device is connected in parallel to form the second tie point, and the controlled end of the relay connects main control unit module；
The data acquisition module include the first operational amplifier, second operational amplifier, analog-digital converter and number every
From device, the input terminal of first operational amplifier is connected in parallel on shunt resistance two sides, the input terminal of the second operational amplifier
It is separately connected the first tie point and the second tie point, the output end difference of first operational amplifier and second operational amplifier
It is connected to the input terminal of analog-digital converter, the output end of the analog-digital converter is connected to the input of digital isolator
The output end at end, the digital isolator connects main control unit module.
2. battery management system of the electric car with AC internal Resistance inspection according to claim 1, which is characterized in that the electricity
It further include capacitor in the return circuit module of pond, the capacitor is connected in series in the cell circuit.
3. battery management system of the electric car with AC internal Resistance inspection according to claim 1, which is characterized in that it is described after
Electric appliance is light coupling relay.
4. battery management system of the electric car with AC internal Resistance inspection according to claim 1, which is characterized in that the electricity
Switch is additionally provided in the circuit that Chi Bao and transformer secondary output, shunt resistance are formed, the controlled end of the switch connects main control list
Element module.
5. battery management system of the electric car with AC internal Resistance inspection according to claim 1, which is characterized in that described
The positive input and reverse input end of one operational amplifier are connected separately with capacitance, and the second operational amplifier is just
Capacitance is connected separately with to input terminal and reverse input end.
6. a kind of inspection based on any battery management system of the electric car with AC internal Resistance inspection of claim 1 to 5
Survey method characterized by comprising
Step 1: the main control unit module control pumping signal module generates sinusoidal excitation signal and injects cell circuit；
Step 2: the main control unit module is closed the relay of first battery cell two sides；
Step 3: first operational amplifier acquires the signal message on shunt resistance and passes through analog-digital converter and sends
To main control unit module；
Step 4: the second operational amplifier acquires the signal message on present battery monomer and passes through analog-digital converter
It is sent to main control unit module；
Step 5: the main control unit module carries out data analysis and calculates to work as according to the signal message of analog-digital converter
The internal resistance of preceding battery cell；
Step 6: the main control unit module disconnects the relay of present battery monomer two sides, and is closed next battery list
The relay of body two sides repeats step 3 to step 5, up to main control unit module analysis and calculates the last one battery list
The internal resistance of body.
7. detection method according to claim 6, it is characterised in that: the main control unit modular spacing preset time pair
Battery pack is detected.
8. detection method according to claim 6, it is characterised in that: the main control unit module receives external internal resistance inspection
Instruction is surveyed, and each battery cell, single battery monomer or certain battery cells are carried out according to the instruction of external internal resistance detection
Detection.
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| CN201610316975.4A CN106019160B (en) | 2016-05-13 | 2016-05-13 | A kind of battery management system and detection method of the electric car with AC internal Resistance inspection |
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| CN201610316975.4A CN106019160B (en) | 2016-05-13 | 2016-05-13 | A kind of battery management system and detection method of the electric car with AC internal Resistance inspection |
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| CN106019160B true CN106019160B (en) | 2019-04-23 |
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| WO2019206855A1 (en) * | 2018-04-24 | 2019-10-31 | Roche Diagnostics Gmbh | Method for determining the system resistance of a handheld medical device |
| CN109799392B (en) * | 2019-02-26 | 2021-01-05 | 福建星云电子股份有限公司 | Method for testing alternating current internal resistance of lithium battery |
| CN110297193A (en) * | 2019-06-25 | 2019-10-01 | 邢台职业技术学院 | Polytypic accumulator inspection system |
| CN110716147A (en) * | 2019-11-14 | 2020-01-21 | 云蜂数智物联网有限公司 | Method and device for measuring internal resistance of battery pack |
| CN111650525B (en) * | 2020-05-11 | 2022-09-30 | 摩登汽车(盐城)有限公司 | Battery management system with battery impedance measurement and impedance measurement method thereof |
| CN112731180A (en) * | 2020-12-28 | 2021-04-30 | 上能电气股份有限公司 | Energy storage system and internal resistance detection method thereof |
| CN112578301B (en) * | 2021-01-14 | 2024-07-23 | 河北杰泰特能源科技有限公司 | On-line detection battery variable frequency alternating current impedance device |
| CN118011229B (en) * | 2024-04-09 | 2024-06-04 | 无锡全裕电子科技有限公司 | Low-voltage lithium battery insulation detection circuit based on unbalanced bridge |
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Address after: 351100 west side of LiHan Road, Jiangxi town, Jiangkou Town, Hanjiang District, Putian, Fujian, China Patentee after: Yundu New Energy Automobile Co.,Ltd. Address before: 351100 west side of LiHan Road, Jiangxi town, Jiangkou Town, Hanjiang District, Putian, Fujian, China Patentee before: FJ MOTOR GROUP, YUDO NEW-ENERGY AUTOMOBILE Co.,Ltd. Address after: 351100 west side of LiHan Road, Jiangxi town, Jiangkou Town, Hanjiang District, Putian, Fujian, China Patentee after: Yundu New Energy Vehicle Co.,Ltd. Address before: 351100 west side of LiHan Road, Jiangxi town, Jiangkou Town, Hanjiang District, Putian, Fujian, China Patentee before: Yundu New Energy Automobile Co.,Ltd. |
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