CN110303937A - A kind of synchronous sampling system and synchronous sampling method of power battery pack - Google Patents
A kind of synchronous sampling system and synchronous sampling method of power battery pack Download PDFInfo
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- CN110303937A CN110303937A CN201810174487.3A CN201810174487A CN110303937A CN 110303937 A CN110303937 A CN 110303937A CN 201810174487 A CN201810174487 A CN 201810174487A CN 110303937 A CN110303937 A CN 110303937A
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- 238000005070 sampling Methods 0.000 title claims abstract description 94
- 230000001360 synchronised effect Effects 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000005611 electricity Effects 0.000 claims description 5
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- 238000005259 measurement Methods 0.000 abstract description 6
- 230000003862 health status Effects 0.000 abstract description 5
- 238000004891 communication Methods 0.000 description 4
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Classifications
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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
- 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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- 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
- G01R31/3842—Arrangements for monitoring battery or accumulator variables, e.g. SoC combining voltage and current measurements
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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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Abstract
The present invention provides a kind of synchronous sampling system of power battery pack and synchronous sampling method, synchronous sampling system includes power battery pack, current sensor, voltage sensor, battery controller；Current sensor provides the initial time of power battery pack synchronized sampling, sends an initial signal in initial time, while sampling the current data of power battery pack；Battery controller receives initial signal, sends an initial order to voltage sensor, controls voltage sensor and start to sample the voltage data of each battery cell, battery controller is made to receive at least one set of current data and voltage data based on synchronization.The present invention is capable of the current data and voltage data of synchronization gain battery cell, to accurately measure the DC internal resistance of battery cell, improve the DC internal resistance measurement accuracy of all battery cells, accurate foundation is provided for the health status judgement of all battery cells, better ensures that the safety of electric car operation.
Description
Technical field
The present invention relates to the synchronous sampling systems and synchronization of electric vehicle engineering field more particularly to a kind of power battery pack
The method of sampling.
Background technique
In recent years, with the rapid growth of social economy, Chinese car ownership is higher and higher.With automotive engineering
Development and car ownership are substantially improved, and people also proposed higher and higher want with safety to the intelligence of automobile
It asks.
The battery management system (Battery Management System, BMS) of electric car is usually controlled by battery
Device, current sensor, voltage sensor etc. collectively form.Wherein, current sensor is responsible for acquiring charging and discharging currents, voltage sensor
Device is responsible for acquiring the voltage of battery cell in power battery pack, and battery controller controls whole system.To the system
Can charging and discharging currents to the power battery pack of electric car, the voltage of battery cell, the temperature of power battery pack etc. carry out
Sampling, so that electric car work is in the safety zone of power battery pack.
But in the related technology, the battery management system of electric car is separately acquired using voltage, electric current, that is, voltage by
Voltage sensor periodic samples are sent to battery controller by serial communication, electric current by current sensor periodic samples,
Battery controller is sent to by serial communication.Such method not can guarantee voltage, the current data that battery controller obtains
It is actual synchronization, i.e., it is different for measuring the sampling instant of the voltage data and current data of the DC internal resistance of battery cell
Step leads to calculate resulting DC internal resistance inaccuracy, can not be provided for the judgement of the health status of all battery cells accurately according to
According to, cannot guarantee well electric car operation safety.
Therefore, the present invention provides a kind of synchronous sampling system of power battery pack and synchronous sampling method, current senses
Device provides the initial time of power battery pack synchronized sampling, sends an initial signal in initial time, while sampling power battery
The current data of group；Battery controller receives initial signal, sends an initial order to voltage sensor, controls voltage sensor
The voltage data for starting to sample each battery cell makes battery controller receive at least one set of current data based on synchronization
And voltage data.The present invention is capable of the current data and voltage data of synchronization gain battery cell, to accurately measure battery list
The DC internal resistance of body, improves the DC internal resistance measurement accuracy of all battery cells, and the health status for all battery cells is sentenced
It is disconnected that accurate foundation is provided, better ensure that the safety of electric car operation.
Summary of the invention
In order to overcome the above technical defects, the object of the present invention is to provide a kind of synchronized sampling systems of power battery pack
System and synchronous sampling method.
An aspect of of the present present invention discloses a kind of synchronous sampling system of power battery pack, comprising: is serially connected with one or more
The power battery pack of a battery cell, the current sensor for being serially connected with the power battery pack are connected to each battery list
The voltage sensor of body, the battery controller being connect with the current sensor, voltage sensor；
The current sensor provides the initial time of the power battery pack synchronized sampling, sends in the initial time
One initial signal, while sampling the current data of the power battery pack；
The battery controller receives the initial signal, sends an initial order to the voltage sensor, controls institute
It states voltage sensor to start to sample the voltage data of each battery cell, the battery controller is made to receive at least one set of base
In the current data and voltage data of synchronization.
Preferably, the synchronous sampling system further includes line synchro, the line synchro be connected to the current sensor with
Between the battery controller；
The current sensor sends a level signal as the initial signal to the battery by the line synchro
Controller.
Preferably, the current sensor provides the power battery pack synchronized sampling every one first preset time
Initial time sends an initial signal in the initial time.
Preferably, the current sensor receives synchronized sampling instruction, provides the power battery pack synchronized sampling
Initial time sends an initial signal in the initial time.
Preferably, the current sensor persistently samples the current data of the power battery pack, when the power battery
When the electric current of group changes, the initial time of the power battery pack synchronized sampling is provided, sends one in the initial time
Initial signal.
Preferably, the voltage sensor receives the initial order of the battery controller, when one second is default
The voltage data of the interior each battery cell of sampling.
Preferably, the battery controller receives at least one set of current data and voltage number based on synchronization
According to the DC internal resistance of each battery cell of calculating.
Another aspect of the present invention discloses a kind of synchronous sampling method of power battery pack, comprising the following steps:
Current sensor provides the initial time of the power battery pack synchronized sampling, sends together in the initial time
Beginning signal, while sampling the current data of the power battery pack；
Battery controller receives the initial signal, sends an initial order to voltage sensor, controls the voltage and pass
Sensor starts to sample the voltage data of each battery cell in the power battery pack；
The battery controller receives at least one set that the current sensor and voltage sensor sample and is based on together
The current data and voltage data at one moment.
Preferably, current sensor provides the initial time of the power battery pack synchronized sampling, in the initial time
An initial signal is sent, while the step of sampling the current data of the power battery pack includes:
One first preset time is set；
Current sensor provides the initial time of the power battery pack synchronized sampling every first preset time,
An initial signal is sent in the initial time, while sampling the current data of the power battery pack.
Preferably, battery controller receives the initial signal, sends an initial order to voltage sensor, described in control
Voltage sensor starts the step of sampling the voltage data of each battery cell in the power battery pack and includes:
One second preset time is set；
Battery controller receives the initial signal, sends an initial order to voltage sensor, controls the voltage and pass
Sensor samples the voltage data of each battery cell in the power battery pack in second preset time.
After above-mentioned technical proposal, compared with prior art, have the advantages that
1. the synchronous sampling system and synchronous sampling method of power battery pack of the invention, being capable of synchronization gain battery cell
Current data and voltage data；
2. the synchronous sampling system and synchronous sampling method of power battery pack of the invention, can accurately measure battery cell
DC internal resistance, improve the DC internal resistance measurement accuracy of all battery cells, for all battery cells health status judge
Accurate foundation is provided, better ensures that the safety of electric car operation.
Detailed description of the invention
Fig. 1 is the structural schematic diagram for meeting the synchronous sampling system of one embodiment of the present invention；
Fig. 2 is the structural schematic diagram for meeting the synchronous sampling system of one embodiment of the present invention；
Fig. 3 is the flow diagram for meeting the synchronous sampling method of one embodiment of the present invention；
Fig. 4 is the sampled result schematic diagram for meeting the synchronized sampling of one embodiment of the present invention.
Appended drawing reference:
11- power battery pack；
12- current sensor；
13- voltage sensor；
14- battery controller；
15- line synchro.
Specific embodiment
Below in conjunction with attached drawing, the advantages of the present invention are further explained with specific embodiment.
With reference to Fig. 1, the synchronous sampling system of power battery pack 11 of the invention, comprising: power battery pack 11 (battery pack),
Current sensor 12, voltage sensor 13, battery controller 14.
Wherein, power battery pack 11 are loaded on electric car, provide power resources for electric car, are responsible for providing whole
The electricity that vehicle needs.It include the one or more battery monomer of concatenation in power battery pack 11.
Core component of the power battery pack 11 as new-energy automobile dynamical system, safety and performance are most important fingers
Mark.On the one hand, power battery pack 11 needs to have enough strength and stiffness, does not occur under the mechanical loads such as vibration, impact
Deformation and dysfunction have enough security protections under collision, the accident conditions such as extruding, roll, fall.On the other hand, electric
Electrical automobile is travelled by electrical energy drive vehicle, and instantaneous power may be up to several hundred kilowatts, and voltage range is from tens volts to several hundred
Volt, electric current also can achieve positive and negative several hundred amperes, the charging and discharging of high current and the output of high voltage, it is meant that dynamic
Power battery pack 11 has very high electrical load requirement.
In addition, power battery pack 11 is usually made of very more battery cells, in order to effectively manage these battery lists
Body controls the charge and discharge of power battery pack 11, and the functional requirement of response vehicle level, and there are also a set of non-for power battery pack 11
Often complicated battery management system, is made of components such as sensor, controllers (electronic control unit), the voltage of acquisition system, electric current,
The data such as temperature carry out complicated calculating, are communicated with vehicle other component, complete specific function, the fortune of decision-making system
Row bound, the abnormality etc. of control system.
Current sensor 12 is serially connected in the high tension loop of power battery pack 11, it is preferable that close to power battery pack 11
Battery pack cathode.Current sensor 12 is responsible for periodic samples vehicle electric current.Current sensor 12 simultaneously with battery controller 14
The current data that sampling obtains is sent to battery controller 14 by serial communication by connection.
In the present invention, for the synchronized sampling for realizing voltage and current, one voltage and current of offer of current sensor 12, which synchronizes, to be adopted
The start time point of sample adjusts storage inside synchrodata so as to adjust the start time point that voltage sensor 13 is sampled
Period, so that it may guarantee the progress of voltage and current synchronized sampling.
Specifically, current sensor 12 provides the initial time of 11 synchronized sampling of a power battery pack, in the initial time
An initial signal is sent to battery controller 14, while sampling the current data of power battery pack 11.Battery controller 14 receives
Initial signal sends an initial order to voltage sensor 13, controls voltage sensor 13 and start to sample each battery cell
Voltage data, thus, at the time of voltage sensor 13 starts to sample the voltage data of each battery cell and after, realize dynamic
The synchronized sampling of 11 voltage and current of power battery pack enables battery controller 14 to receive at least one set of electric current based on synchronization
Data and voltage data.
In a preferred embodiment, it is synchronous to provide power battery pack 11 every one first preset time for current sensor 12
The initial time of sampling sends an initial signal in initial time.In another preferred embodiment, current sensor 12 receive
The instruction of one synchronized sampling, provides the initial time of 11 synchronized sampling of power battery pack, sends an initial signal in initial time.?
In another preferred embodiment, current sensor 12 persistently samples the current data of power battery pack 11, when power battery pack 11
When electric current changes, the initial time of 11 synchronized sampling of power battery pack is provided, sends an initial signal in initial time.
With reference to Fig. 2, in a preferred embodiment, a line synchro 15 is set and is connected to current sensor 12 and battery control
Between device 14.The line synchro 15 is defaulted as high level.Current sensor 12 sends a low level signal conduct by line synchro 15
Initial signal is to battery controller 14.
For example, current sensor 12 persistently samples the current data of power battery pack 11 after circuit connection, and every one
First preset time sends a low level signal as initial signal to battery controller 14 by line synchro 15.Battery control
Device 14 reads a low level signal when needing to synchronize sampling, when adjusting the starting that voltage sensor 13 is sampled
Between point, adjust storage inside synchrodata period.
Voltage sensor 13, each battery cell being connected in power battery pack 11, it is preferable that be set to power battery
In the battery pack of group 11.Voltage sensor 13 is responsible for the voltage of each battery cell in periodic samples power battery pack 11.
Voltage sensor 13 is connect with battery controller 14 simultaneously, and the voltage data that sampling obtains is sent to battery by serial communication
Controller 14.
In a preferred embodiment, voltage sensor 13 receive the initial order of battery controller 14, default one second
The voltage data of each battery cell of sampling in time.In another preferred embodiment, voltage sensor 13 receive battery control
The initial order of device 14 samples the voltage data of primary each battery cell.In another preferred embodiment, voltage sensor
13, the initial order of battery controller 14 is received, the voltage data of each battery cell is persistently sampled.
Battery controller 14 is responsible for the whole management work of power battery pack 11, including temperature, managing electric quantity, power-on and power-off
Management etc..When battery management system needs to synchronize sampling, battery controller 14 receives synchronized sampling instruction, battery control
Device 14 processed can temporarily cease other tasks, read the low level signal of a line synchro 15 sending, adjust voltage sensor 13
The start time point sampled adjusts the period of storage inside synchrodata.After synchronized sampling, battery is run again
Other tasks of 14 script of controller.
In a preferred embodiment, battery controller 14 receive at least one set of current data and electricity based on synchronization
Data are pressed, the DC internal resistance of each battery cell is calculated.
In power battery pack 11 DC internal resistance of battery cell with battery cell SOH (State of Health, health
State) variation, the DC internal resistance for externally showing as battery cell in power battery pack 11 increases with cell degradation severity
Greatly, therefore in power battery pack 11 DC internal resistance of battery cell is the key that the SOH for judging battery cell.Meanwhile power electric
The size of the resistance value of the DC internal resistance of battery cell is also related with the charge-discharge electric power ability of battery cell in pond group 11.It is specific and
Speech, when the resistance value of the DC internal resistance of battery cell is bigger, battery cell allows lower using power, if the use of battery cell
Power is more than the limit value of battery cell power, that is, has exceeded power battery safe operating area, then likely results in battery list
Side reaction occurs for internal portion's positive and negative anodes, and the positive and negative pole material of battery cell is lost, and aggravates battery cell aging, even results in safety
Problem.It follows that the DC internal resistance of battery cell is the one of power battery safe operating area delimitation in power battery pack 11
A important parameter.
Transient Analysis usually is used to the measurement of the DC internal resistance of battery cell, i.e., with the voltage value of transition divided by transition
Current value to calculate the DC internal resistance of battery cell.For the DC internal resistance for obtaining accurate battery cell, it is desirable that the electricity of sampling
Pressure is synchronous with holding at the time of electric current, if the voltage and current of sampling is asynchronous, will result in the inaccuracy of measurement result.
The present invention is based on the above problems, provide a kind of synchronous sampling system, are capable of the electric current of synchronization gain battery cell
Data and voltage data, to accurately measure the DC internal resistance of battery cell, the DC internal resistance for improving all battery cells is surveyed
Accuracy of measurement provides accurate foundation for the health status judgement of all battery cells, better ensures that the peace of electric car operation
Quan Xing.
In addition, ignoring current sensor 12 with reference to Fig. 2 by line synchro 15 and sending low level signal to battery controller 14
Time delays (level propagation time is very short), consider that battery controller 14 sends initial order to voltage sensor 13
Time t1(ms), (calibration obtains the transmission time of 13 control command of voltage sensor or 13 handbook of voltage sensor is inquired
To) t2(ms), then initial time (the t, provided in current sensor 121+t2) after (ms), battery management system realizes electric current electricity
The synchronized sampling of pressure.For example, the time that current sensor 12, voltage sensor 13 sample every time is 1ms with reference to Fig. 4, total
Time delays t1+t2For 5ms, then after the initial time that current sensor 12 provides when 5ms, voltage sensor 13 starts to sample,
That is when 6ms, system starts to synchronize.
With reference to Fig. 3, synchronous sampling method of the invention the following steps are included:
Current sensor provides the initial time of power battery pack synchronized sampling, sends an initial signal in initial time,
The current data of power battery pack is sampled simultaneously；
Battery controller receives initial signal, sends an initial order to voltage sensor, controls voltage sensor and start
Sample the voltage data of each battery cell in power battery pack；
At least one set that battery controller reception current sensor and voltage sensor sample is based on synchronization
Current data and voltage data.
For example, current sensor persistently samples the current data of power battery pack after circuit connection, and every one first
Preset time provides the initial time of power battery pack synchronized sampling, sends a low level signal as starting by line synchro
Signal is to battery controller；Battery controller reads a low level signal when needing to synchronize sampling, and adjustment voltage passes
The start time point that sensor is sampled sends an initial order to voltage sensor, and it is dynamic that control voltage sensor starts sampling
The voltage data of each battery cell in power battery pack；Then, battery controller receives current sensor and voltage sensor is adopted
At least one set of current data and voltage data based on synchronization that sample obtains.
It should be noted that the embodiment of the present invention has preferable implementation, and not the present invention is made any type of
Limitation, any one skilled in the art change or are modified to possibly also with the technology contents of the disclosure above equivalent effective
Embodiment, as long as without departing from the content of technical solution of the present invention, it is to the above embodiments according to the technical essence of the invention
Any modification or equivalent variations and modification, all of which are still within the scope of the technical scheme of the invention.
Claims (10)
1. a kind of synchronous sampling system of power battery pack, which is characterized in that
It include: the power battery pack for being serially connected with one or more battery monomer, the current sense for being serially connected with the power battery pack
Device, the voltage sensor for being connected to each battery cell, the battery control being connect with the current sensor, voltage sensor
Device processed；
The current sensor provides the initial time of the power battery pack synchronized sampling, sends together in the initial time
Beginning signal, while sampling the current data of the power battery pack；
The battery controller receives the initial signal, sends an initial order to the voltage sensor, controls the electricity
Pressure sensor starts to sample the voltage data of each battery cell, receives the battery controller at least one set of based on same
The current data and voltage data at one moment.
2. synchronous sampling system as described in claim 1, which is characterized in that
The synchronous sampling system further includes line synchro, and the line synchro is connected to the current sensor and the battery controls
Between device；
The current sensor sends a level signal as the initial signal to the battery by the line synchro and controls
Device.
3. synchronous sampling system as claimed in claim 1 or 2, which is characterized in that
The current sensor provides the initial time of the power battery pack synchronized sampling every one first preset time,
The initial time sends an initial signal.
4. synchronous sampling system as claimed in claim 1 or 2, which is characterized in that
The current sensor receives synchronized sampling instruction, provides the initial time of the power battery pack synchronized sampling,
The initial time sends an initial signal.
5. synchronous sampling system as claimed in claim 1 or 2, which is characterized in that
The current sensor persistently samples the current data of the power battery pack, when the electric current of the power battery pack is sent out
When changing, the initial time of the power battery pack synchronized sampling is provided, sends an initial signal in the initial time.
6. battery information synchronous sampling system as claimed in claim 1 or 2, which is characterized in that
The voltage sensor receives the initial order of the battery controller, samples in one second preset time every
The voltage data of a battery cell.
7. battery information synchronous sampling system as claimed in claim 1 or 2, which is characterized in that
The battery controller receives at least one set of current data and voltage data based on synchronization, calculates each
The DC internal resistance of the battery cell.
8. a kind of synchronous sampling method of power battery pack, which is characterized in that
The following steps are included:
Current sensor provides the initial time of the power battery pack synchronized sampling, sends a starting letter in the initial time
Number, while sampling the current data of the power battery pack；
Battery controller receives the initial signal, sends an initial order to voltage sensor, controls the voltage sensor
Start to sample the voltage data of each battery cell in the power battery pack；
The battery controller receives at least one set that the current sensor and voltage sensor sample and is based on for the moment
The current data and voltage data carved.
9. synchronous sampling method as claimed in claim 8, which is characterized in that
Current sensor provides the initial time of the power battery pack synchronized sampling, sends a starting letter in the initial time
Number, while the step of sampling the current data of the power battery pack includes:
One first preset time is set；
Current sensor provides the initial time of the power battery pack synchronized sampling, in institute every first preset time
It states initial time and sends an initial signal, while sampling the current data of the power battery pack.
10. synchronous sampling method as claimed in claim 8 or 9, which is characterized in that
Battery controller receives the initial signal, sends an initial order to voltage sensor, controls the voltage sensor
Starting the step of sampling the voltage data of each battery cell in the power battery pack includes:
One second preset time is set；
Battery controller receives the initial signal, sends an initial order to voltage sensor, controls the voltage sensor
The voltage data of each battery cell in the power battery pack is sampled in second preset time.
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| CN112937302A (en) * | 2021-01-25 | 2021-06-11 | 中国第一汽车股份有限公司 | High-voltage monitoring method, device, storage medium and system |
| CN113702842A (en) * | 2021-07-15 | 2021-11-26 | 恒大海拉电子(扬州)有限公司 | Method for estimating endurance mileage of pure electric vehicle |
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| CN110712561B (en) * | 2019-10-15 | 2021-06-15 | 宁波吉利汽车研究开发有限公司 | Battery Management Systems and Electric Vehicles |
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