CN106093583B - A kind of Vehicular accumulator cell group battery cell impedance measurement device and method - Google Patents
A kind of Vehicular accumulator cell group battery cell impedance measurement device and method Download PDFInfo
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- CN106093583B CN106093583B CN201610591663.4A CN201610591663A CN106093583B CN 106093583 B CN106093583 B CN 106093583B CN 201610591663 A CN201610591663 A CN 201610591663A CN 106093583 B CN106093583 B CN 106093583B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/08—Measuring resistance by measuring both voltage and current
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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- Measurement Of Resistance Or Impedance (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The present invention relates to a kind of Vehicular accumulator cell group battery cell impedance measurement device and methods, and to measure the AC impedance of concatenated battery cell in multiple battery modules in accumulator group, which includes：Ac-excited module：To provide certain frequency and the sinusoidal excitation current of amplitude for multiple concatenated battery modules；Accumulator group controller：Exciting current is generated to control ac-excited module；Current measurement module：To measure exciting current that ac-excited module is injected to accumulator group and detection current value be sent to accumulator group controller；Battery cell voltage surveys meter module：To measure the response voltage of all concatenated battery cells in battery module and obtain exciting current value from accumulator group controller by communication module, the AC impedance of battery cell is calculated.Compared with prior art, the present invention has many advantages, such as to concentrate excitation, independent measurement, measurement accurate.
Description
Technical field
The present invention relates to pure electric automobile, plug-in hybrid-power automobile application fields, more particularly, to a kind of vehicle-mounted storage
Battery cell monomer impedance measurement device and method.
Background technology
With the popularization and application of electric vehicle and plug-in hybrid-power automobile, to the safety of Vehicular accumulator cell packet, can
There is very high requirement by property.For battery management system, the current age of power battery can be timely and accurately learnt
State, power output capacity, internal temperature have very important significance to carry out the prediction of thermal failure and prevent abuse etc..
And above-mentioned characteristic has very big relationship with impedance of the accumulator in a certain Frequency point or a certain frequency separation, such as following several texts
It offers：(1)LEE J H,CHOI W.Novel State-of-Charge Estimation Method for Lithium
Polymer Batteries Using Electrochemical Impedance Spectroscopy [J].Journal of
Power Electronics,2011,11(2):237-43.(2)GALEOTTI M,CINA L,GIAMMANCO C,et
al.Performance analysis and SOH(state of health)evaluation of lithium polymer
batteries through electrochemical impedance spectroscopy[J].Energy,2015,89
(678-86.(3)ZHU J G,SUN Z C,WEI X Z,et al.A new lithium-ion battery internal
temperature on-line estimate method based on electrochemical impedance
spectroscopy measurement[J].Journal of Power Sources,2015,274(990-1004)..Therefore
Realize that the impedance measurement of Vehicular accumulator cell packet has significant application value.
Currently, there are no preferable method or apparatus for the impedance measurement of the accumulator under vehicular applications.Laboratory uses
Battery AC impedance measurement method majority be use Linear Power Amplifier or power supply, designed use have versatility, there are volumes
Greatly, low, the of high cost disadvantage of efficiency, and certain functions have no when being applied on electric vehicle or plug-in hybrid-power automobile
It is necessary.Objectively it is necessary to study new methods measures the whole packet internal battery impedance of real vehicle.Patent of invention《Battery impedance is examined
Examining system, device and method》(Authorization Notice No.：CN102809691B) and《Spectroscopic battery-cell-impedance measurement arrangement》It (authorizes public
Announcement number：CN102466766B) although a kind of the battery cell impedance measurement device and method of battery unit are given, in reality
There is the following insufficient when real vehicle application：(1) device in relation to current excitation can only gradually be made respectively in the invention cited in
Apply exciting current used in battery unit both ends, when specific implementation needs to carry out switching electrical switches, increases system cost, drop
Low system reliability；(2) to encouraging the measurement of lower response voltage that can only carry out a battery list every time in the invention cited in
Member response voltage measurement, and need and exciting bank synchronism switching to different battery units.
Invention content
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide a kind of excitation of concentration, individually
It measures, measure accurate Vehicular accumulator cell group battery cell impedance measurement device and method.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of Vehicular accumulator cell group battery cell impedance measurement device, to measure in accumulator group in multiple battery modules
The AC impedance of concatenated battery cell, the device include：
Ac-excited module：It is connect respectively with alternating current and accumulator group, to provide one for multiple concatenated battery modules
Determine the sinusoidal excitation current of frequency and amplitude；
Accumulator group controller：It is connect with ac-excited module, exciting current is generated to control ac-excited module；
Current measurement module：It connect with accumulator group controller, is injected to accumulator group to measure ac-excited module
Exciting current and by detection current value be sent to accumulator group controller；
Battery cell voltage surveys meter module：Equipped with it is multiple and respectively with the mating setting of each battery module, to measure electricity
In the module of pond the response voltage of all concatenated battery cells and by communication module from accumulator group controller obtain excitation electricity
The AC impedance of battery cell is calculated in flow valuve.
It includes multi-channel differential amplifying unit, multichannel AD conversion unit and storage that the battery cell voltage, which surveys meter module,
Battery module controller, the battery module, multi-channel differential amplifying unit, multichannel AD conversion unit and battery module
Controller is sequentially connected, and the battery module controller is connect by communication module with accumulator group controller.
The ac-excited module include controller and sequentially connected power factor correction device, DC/DC converters,
H bridges, transformer and output filter, the cities power factor correction Qi Yu electrical connection, the output filter and electric power storage
The positive and negative anodes of pond group connect, and the controller connects with DC/DC converters and H bridgings respectively, and passes through CAN bus and electric power storage
Pond group controller communication.
The current measurement module includes differential amplification unit, low-pass filter, AD conversion unit and is arranged defeated
Go out the shunt resistance on electric wire, the differential amplification unit between filter and accumulator group anode and is connected in parallel on shunt resistance two
End, and pass sequentially through low-pass filter and AD conversion unit is connect with accumulator group controller.
The communication module includes vehicle-mounted ethernet router.
A kind of Vehicular accumulator cell group battery cell impedance measurement method, includes the following steps：
1) excitation is concentrated：Ac-excited module generates after the impedance measurement initiation command for receiving accumulator group controller
Corresponding frequencies, amplitude sinusoidal excitation current and be applied to the positive and negative interpolar of accumulator group, make the multiple battery lists being serially connected
Body generates response voltage；
2) independent measurement：Multiple battery cell voltages are surveyed meter module and are surveyed respectively to the response voltage of each battery cell
Amount, while current measurement module obtains exciting current value, being sent to each battery module by accumulator group controller controls
Device, voltage and exciting current value calculate the AC impedance of battery cell according to response.
The step 2) specifically includes following steps：
21) accumulator group controller is synchronous into row clock by ethernet router and multiple battery module controllers；
22) accumulator group controller measures the exciting current value under multiple Energizing cycles by current measurement module, simultaneously
Multiple battery module controllers also begin to measure the response voltage of battery cell and timestamp are added；
23) current value is added after timestamp and is sent to ethernet router by the excitation of accumulator group controller, Etherloop
It is forwarded to multiple battery module controllers after the timestamp of its own is added again from device, each battery module controller exists
After the forwarding data for receiving ethernet router, according to the voltage of the timestamp and itself of the forwarding data of ethernet router
Data time stamp realizes time alignment, and the AC impedance of each battery cell is finally calculated.
Compared with prior art, the present invention has the following advantages：
One, excitation is concentrated：Vehicle-mounted ac-excited module is placed in electric power storage in the battery pack ac impedance measurement device of the present invention
Series battery is generated outside the group of pond and concentrates excitation, with innovative and at low cost, reliability is high；
Two, independent measurement：Voltage measurement module proposed by the present invention can realize multiple accumulator lists in series battery
Voltage synchronous sampling is responded under the corresponding exciting current of member, improves measurement efficiency, and is easy to and existing battery monitor dress of connecting
It sets and is multiplexed；
Three, it is accurate to measure：The vehicle-mounted Ethernet with timestamp that the present invention uses transmits electric current number as communications carrier
The impedance computation error brought is postponed by stateless service according to reducing.
Description of the drawings
Fig. 1 is the structural diagram of the present invention.
Fig. 2 is concentration excitation and the independent measurement method flow diagram of the present invention.
Fig. 3 is the measurement flow chart of the voltage and current of the present invention.
Wherein, 1, ac-excited module, 11, power factor correction device, 12, DC/DC converters, 13, H bridges, 14, transformation
Device, 15, output filter, 16, controller, 2, battery module, 3, battery cell voltage survey meter module, 31, multi-channel differential puts
Big unit, 32, multichannel AD conversion unit, 33, battery module controller, 4, current measurement module, 41, differential amplification list
Member, 42, low-pass filter, 43, AD conversion unit, 44, shunt resistance, 5, accumulator group controller, 6, communication module, 7, city
Electricity, 8, CAN bus.
Specific implementation mode
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment：
In electric vehicle or plug-in hybrid-power automobile application, accumulator group is mostly passed through by multiple battery cells
Connection in series-parallel connects, and concatenated single battery number can reach 100~200, is specifically dependent upon designed power-supply system
Voltage class and used single battery single voltage class or material system.For example, one by 100 40Ah phosphorus
The pure electric automobile accumulator group of the sour monomer series-connected connection composition of lithium iron battery, nominal voltage reach 320V.And in battery list
In body grouping procedure, it is composed in series a battery module 2 by 10 battery cells and voltage, temperature is completed by module level monitoring device
The monitoring such as degree and management.For such application scenario, the embodiment of the present invention has the characteristics that following.
As shown in Figure 1, by multi-channel differential amplifying unit 31, multichannel AD conversion unit 32, battery module controller
33 connections, which constitute, realizes that the battery cell voltage of 10 single battery voltage measurements and impedance computation surveys meter module 3, this reality
It includes 10 similar survey meter modules to apply in example, wherein each battery module controller 33 is connected by Ethernet
To ethernet router, ethernet router is connected with accumulator group controller 5, accumulator group controller 5 and current measurement mould
Block 4 is connected, while being connected with ac-excited module 1 by CAN bus 8, when carrying out impedance measurement, accumulator group controller 5
It is sent and is instructed to the controller 16 of ac-excited module by CAN bus 8, controller 16 controls DC/DC converters according to instruction
At the same time the positive and negative interpolar that the sinusoidal excitation current of the generation corresponding frequencies of 12 and H bridges 13 and amplitude is injected into accumulator group stores
Battery controller 5 begins to pass through the measurement that current measurement module 4 carries out exciting current, and each battery module controller 33 passes through
It crosses coupled battery cell voltage survey meter module 3 and carries out response voltage measurement.After measurement at one, accumulator group control
Device 5 processed will measure obtained current signal and timestamp be added and by ethernet router to each battery module controller 33
Forward exciting current value.Battery module controller 33 counts the impedance of battery cell according to stimulus stream and response voltage
It calculates.
As shown in Figures 2 and 3, figure is the measurement procedure for concentrating excitation and independent measurement method flow diagram and voltage and current
Figure.
This hair can be understood and applied the above description of the embodiments is intended to facilitate those skilled in the art
It is bright.Person skilled in the art obviously easily can make various modifications to these embodiments, and described herein
General Principle is applied in other embodiment without having to go through creative labor.Therefore, the present invention is not limited to above-mentioned implementations
Example, those skilled in the art's announcement according to the present invention, improvement and modification made without departing from the scope of the present invention all should be
Within protection scope of the present invention.
Claims (6)
1. a kind of Vehicular accumulator cell group battery cell impedance measurement device, goes here and there to measure in accumulator group in multiple battery modules
The AC impedance of the battery cell of connection, which is characterized in that the device includes：
Ac-excited module (1)：It is connect respectively with alternating current (7) and accumulator group, to be carried for multiple concatenated battery modules (2)
For the sinusoidal excitation current of certain frequency and amplitude, the ac-excited module (1) includes controller (16) and connects successively
Power factor correction device (11), DC/DC converters (12), H bridges (13), transformer (14) and the output filter (15) connect, institute
The power factor correction device (11) stated is connect with alternating current (7), and the output filter (15) and the positive and negative anodes of accumulator group connect
It connects, the controller (16) is connect with DC/DC converters (12) and H bridges (13) respectively, and passes through CAN bus (8) and storage
Battery controller (5) communicates；
Accumulator group controller (5)：It is connect with ac-excited module (1) by CAN bus (8), to control ac-excited mould
Block (1) generates exciting current；
Current measurement module (4)：It is connect with accumulator group controller (5), to measure ac-excited module (1) to accumulator group
Detection current value is simultaneously sent to accumulator group controller (5) by the exciting current of injection；
Battery cell voltage surveys meter module (3)：Equipped with it is multiple and respectively with each battery module (2) mating setting, to measure
In battery module (2) the response voltage of all concatenated battery cells and by communication module (6) from accumulator group controller (5)
Exciting current value is obtained, the AC impedance of battery cell is calculated.
2. a kind of Vehicular accumulator cell group battery cell impedance measurement device according to claim 1, which is characterized in that described
Battery cell voltage survey meter module (3) include multi-channel differential amplifying unit (31), multichannel AD conversion unit (32) and store
Battery module controller (33), the battery module, multi-channel differential amplifying unit (31), multichannel AD conversion unit (32)
It is sequentially connected with battery module controller (33), the battery module controller (33) passes through communication module (6) and storage
Battery controller (5) connects.
3. a kind of Vehicular accumulator cell group battery cell impedance measurement device according to claim 1, which is characterized in that described
Current measurement module (4) include differential amplification unit (41), low-pass filter (42), AD conversion unit (43) and setting exist
Shunt resistance (44) between output filter (15) and accumulator group anode on electric wire, the differential amplification unit (41) is simultaneously
Shunt resistance (44) both ends are associated in, and passes sequentially through low-pass filter (42) and AD conversion unit (43) and is controlled with accumulator group
Device (5) connects.
4. a kind of Vehicular accumulator cell group battery cell impedance measurement device according to claim 1, which is characterized in that described
Communication module (6) include vehicle-mounted ethernet router.
5. a kind of application is according to the survey of claim 1-4 any one of them Vehicular accumulator cell group battery cell impedance measurement devices
Amount method, which is characterized in that include the following steps：
1) excitation is concentrated：Ac-excited module generates accordingly after the impedance measurement initiation command for receiving accumulator group controller
Frequency, amplitude sinusoidal excitation current and be applied to the positive and negative interpolar of accumulator group, so that the multiple battery cells being serially connected is produced
Raw response voltage；
2) independent measurement：Multiple battery cell voltages are surveyed meter module and are measured respectively to the response voltage of each battery cell,
Current measurement module obtains exciting current value simultaneously, and each battery module controller is sent to by accumulator group controller,
Voltage and exciting current value calculate the AC impedance of battery cell according to response.
6. measurement method according to claim 5, which is characterized in that the step 2) specifically includes following steps：
21) accumulator group controller is synchronous into row clock by ethernet router and multiple battery module controllers；
22) accumulator group controller measures the exciting current value under multiple Energizing cycles by current measurement module, while multiple
Battery module controller also begins to measure the response voltage of battery cell and timestamp is added；
23) current value is added after timestamp and is sent to ethernet router by the excitation of accumulator group controller, ethernet router
It is forwarded to multiple battery module controllers after the timestamp of its own is added again, each battery module controller is receiving
To after the forwarding data of ethernet router, according to the voltage data of the timestamp and itself of the forwarding data of ethernet router
Timestamp realizes time alignment, and the AC impedance of each battery cell is finally calculated.
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| US11223074B2 (en) * | 2017-10-16 | 2022-01-11 | Neapco Intellectual Property Holdings, Llc | Battery cell monitoring system |
| DE102018206505A1 (en) * | 2018-04-26 | 2019-10-31 | Bayerische Motoren Werke Aktiengesellschaft | Diagnostic method and diagnostic system for an electrochemical energy storage cell |
| WO2020087338A1 (en) * | 2018-10-31 | 2020-05-07 | 深圳市大疆创新科技有限公司 | Method and device for online recognition of battery parameter |
| DE102019102472B4 (en) | 2019-01-31 | 2020-09-03 | Audi Ag | Method for determining parameter values of a model of an electrochemical cell of a battery cell in a battery of a motor vehicle as well as control device and motor vehicle battery |
| 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 |
| CN114594383A (en) * | 2022-03-04 | 2022-06-07 | 吉林大学 | Online impedance measuring device for fuel cell pack |
| CN116148698B (en) * | 2023-04-18 | 2023-07-07 | 山东艾诺智能仪器有限公司 | Online alternating current impedance tester for fuel cell |
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