CN106501736B - Internal resistance of cell evaluation method and device - Google Patents
Internal resistance of cell evaluation method and device Download PDFInfo
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- CN106501736B CN106501736B CN201710005855.7A CN201710005855A CN106501736B CN 106501736 B CN106501736 B CN 106501736B CN 201710005855 A CN201710005855 A CN 201710005855A CN 106501736 B CN106501736 B CN 106501736B
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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]
- G01R31/367—Software therefor, e.g. for battery testing using modelling or look-up tables
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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]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
Abstract
The embodiment of the invention provides a kind of internal resistance of cell evaluation method and devices, are related to battery technology field.The method is by obtaining battery in the first battery core voltage value at the first moment and the first current value；According to preset delay, the battery is obtained in the second battery core voltage value at the second moment and the second current value；By the first current value of the battery and states the current differential between the second current value and compared with preset current threshold；If current differential, which is greater than preset current threshold, is calculated the initial internal resistance value of the battery according to the current differential, the first battery core voltage value and the second battery core voltage value；Based on above step, internal resistance of cell value of the battery under different state-of-charges is obtained, at least one initial internal resistance value is obtained；Algorithm process is filtered at least one described initial internal resistance value, obtains the internal resistance estimated value of battery, with this under the premise of not increasing battery management system cost, realizes the internal resistance value of on-line measurement battery.
Description
Technical field
The present invention relates to battery technology fields, in particular to a kind of internal resistance of cell evaluation method and device.
Background technique
In recent years, lithium-ion-power cell group large-scale application in electric car, large-scale energy-accumulating power station, backup power supply
Etc. the important events for needing secondary cell.Since lithium ion battery has, energy is big, discharge voltage is high, has extended cycle life, without note
Recall effect, with quick charge capability, that self-discharge rate is small, has a variety of safety precautions, good seal, environmental protection etc. is numerous
Advantage gradually replaces the secondary cells such as plumbic acid, ni-mh, becomes the overlord in secondary cell application market.Especially in electricity
In terms of electrical automobile, with the raising that country and common people's environmental protection consciousness and energy crisis are realized, electric car large area
It is universal, the relevant technologies have also obtained rapid progress and development.The dynamical lithium-ion battery packs also application of large area
Onto electric car.
Internal resistance, one of the important feature as characterization dynamical lithium-ion battery packs health status.Presently, there are many estimations
Method of the internal resistance of cell, such as direct-current discharge internal resistance measurement method, alternating current bridge method etc..Existing method, which mostly concentrates on, directly to be surveyed
Amount technology even also needs to increase additional hardware cost.It is all off-line measurement method although measurement accuracy is higher, for
The battery in actual vehicle is run on, existing method perhaps leads to the increase of measurement cost or leads to the decline of measurement accuracy.
Summary of the invention
In view of this, the embodiment of the invention provides a kind of internal resistance of cell evaluation method and devices, to improve the above problem.
In a first aspect, being applied to battery management system, institute the embodiment of the invention provides a kind of internal resistance of cell evaluation method
Battery management system is stated for managing battery pack, the battery pack includes N batteries, and the method includes obtaining the battery to exist
The first battery core voltage value at the first moment and the first current value；According to preset delay, the battery is obtained at the second moment
The second battery core voltage value and the second current value；It will be between first current value and second current value of the battery
Current differential compared with preset current threshold；If the current differential is greater than preset current threshold, according to institute
Current differential, the first battery core voltage value and the second battery core voltage value are stated, the initial interior of the battery is calculated
Resistance value；Based on above step, internal resistance of cell value of the battery under different state-of-charges is obtained, it is initial interior to obtain at least one
Resistance value；Algorithm process is filtered at least one described initial internal resistance value, obtains the internal resistance estimated value of the battery.
Second aspect, the embodiment of the invention provides a kind of internal resistances of cell to estimate device, is applied to battery management system, institute
Battery management system is stated for managing battery pack, the battery pack includes N batteries, and described device includes: first acquisition unit,
For obtaining the battery in the first battery core voltage value at the first moment and the first current value；Second acquisition unit is used for root
According to preset delay, the battery is obtained in the second battery core voltage value at the second moment and the second current value；Comparison unit is used
In the second current value that first current value that obtains the first acquisition unit and the second acquisition unit obtain it
Between current differential compared with preset current threshold；Computing unit, if for obtaining the electric current according to comparison unit
Difference is greater than preset current threshold, then according to the current differential, the first battery core voltage value and second battery core
The initial internal resistance value of the battery is calculated in voltage value；Third acquiring unit obtains the electricity for being based on above step
Internal resistance of cell value of the pond under different state-of-charges, obtains at least one initial internal resistance value；Processing unit, for the third
At least one described initial internal resistance value that acquiring unit obtains is filtered algorithm process, obtains the internal resistance estimation of the battery
Value.
A kind of internal resistance of cell evaluation method and device provided in an embodiment of the present invention, the method is by obtaining the battery
In the first battery core voltage value at the first moment and the first current value；According to preset delay, the battery is obtained at second
The the second battery core voltage value and the second current value carved；By first current value of the battery and second current value it
Between current differential compared with preset current threshold；If the current differential is greater than preset current threshold, basis
The current differential, the first battery core voltage value and the second battery core voltage value, are calculated the initial of the battery
Internal resistance value；Based on above step, internal resistance of cell value of the battery under different state-of-charges is obtained, it is initial to obtain at least one
Internal resistance value；Algorithm process is filtered at least one described initial internal resistance value, the internal resistance estimated value of the battery is obtained, with this
Under the premise of not increasing battery management system cost, the high-precision internal resistance value of on-line measurement battery is realized.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not construed as pair
The restriction of range for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached drawings.
Fig. 1 is a kind of structural block diagram that can be applied to the electronic equipment in the embodiment of the present invention；
Fig. 2 is the flow chart for the internal resistance of cell evaluation method that first embodiment of the invention provides；
Fig. 3 is the flow chart for the internal resistance of cell evaluation method that second embodiment of the invention provides；
Fig. 4 is the schematic diagram of the equivalent-circuit model for the internal resistance of cell evaluation method that second embodiment of the invention provides；
Fig. 5 is the structural block diagram that the internal resistance of cell that third embodiment of the invention provides estimates device；
Fig. 6 is the structural block diagram that the internal resistance of cell that fourth embodiment of the invention provides estimates device.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.The present invention being usually described and illustrated herein in the accompanying drawings is implemented
The component of example can be arranged and be designed with a variety of different configurations.
Therefore, the detailed description of the embodiment of the present invention provided in the accompanying drawings is not intended to limit below claimed
The scope of the present invention, but be merely representative of selected embodiment of the invention.Based on the embodiments of the present invention, this field is common
Technical staff's every other embodiment obtained without creative efforts belongs to the model that the present invention protects
It encloses.
It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined in a attached drawing, does not then need that it is further defined and explained in subsequent attached drawing.
In the description of the present invention, it should be noted that term " first ", " second ", " third " etc. are only used for distinguishing and retouch
It states, is not understood to indicate or imply relative importance.
Referring to Fig. 1, Fig. 1 shows a kind of structural block diagram of electronic equipment 100 that can be applied in the embodiment of the present invention.
The electronic equipment 100 can be used as user terminal, be also possible to computer or server, the user terminal can for mobile phone,
Tablet computer or car-mounted terminal.The user terminal can also be that power motor, the power motor can be applied to electronic vapour
Vehicle.As shown in Figure 1, electronic equipment 100 may include that memory 110, storage control 111, processor 112 and the internal resistance of cell are estimated
Calculate device.
Memory 110, storage control 111 are directly or indirectly electrically connected between each element of processor 112, to realize
The transmission or interaction of data.For example, can realize electricity by one or more communication bus or signal bus between these elements
Connection.Internal resistance of cell evaluation method respectively includes at least one can be stored in the form of software or firmware (firmware)
Software function module in reservoir 110, such as the internal resistance of cell estimate the software function module or computer journey that device includes
Sequence.
Memory 110 can store various software programs and module, and such as internal resistance of cell provided by the embodiments of the present application is estimated
Calculate the corresponding program instruction/module of method and device.Software program of the processor 112 by operation storage in the memory 110
And module, thereby executing various function application and data processing, i.e. internal resistance of cell estimation in realization the embodiment of the present application
Method.Memory 110 can include but is not limited to random access memory (Random Access Memory, RAM), read-only to deposit
Reservoir (Read Only Memory, ROM), programmable read only memory (Programmable Read-Only Memory,
PROM), erasable read-only memory (Erasable Programmable Read-Only Memory, EPROM), electric erasable
Read-only memory (Electric Erasable Programmable Read-Only Memory, EEPROM) etc..
Processor 112 can be a kind of IC chip, have signal handling capacity.Above-mentioned processor can be general
Processor, including central processing unit (Central Processing Unit, abbreviation CPU), network processing unit (Network
Processor, abbreviation NP) etc.；It can also be digital signal processor (DSP), specific integrated circuit (ASIC), ready-made programmable
Gate array (FPGA) either other programmable logic device, discrete gate or transistor logic, discrete hardware components.It can
To realize or execute disclosed each method, step and the logic diagram in the embodiment of the present application.General processor can be micro-
Processor or the processor are also possible to any conventional processor etc..
Electronic equipment 100 can also include battery core voltage acquisition module 113.Battery core voltage acquisition module 113 and processor
112 electrical connections.Battery core voltage acquisition module 113 is used to acquire the battery core voltage of every batteries in battery pack and passes to the place
Manage device 112.Battery core voltage acquisition module 113 includes multichannel battery core voltage collection circuit.There are N batteries in battery pack, correspondingly
Then there is the road N battery core voltage collection circuit.Every batteries are corresponding with battery core voltage collection circuit all the way.
Electronic equipment 100 can also include current acquisition module 114.The current acquisition module 114 and 112 electricity of processor
Connection.The current acquisition module 114 is for acquiring the electric current of each series-connected cell in battery pack and passing to the processor
112。
First embodiment
Referring to figure 2., the embodiment of the invention provides a kind of battery evaluation methods, are applied to battery management system, described
For battery management system for managing battery pack, the battery pack includes N batteries, which comprises
Step S200: the battery is obtained in the first battery core voltage value at the first moment and the first current value；
Voltage battery core Acquisition Circuit acquires the battery core voltage of the battery at the first moment, is defined as the first battery core of the battery
Voltage value；Current acquisition module acquires the battery core voltage of the battery at the first moment, is defined as the first current value of the battery.Institute
Stating for the first moment can be battery online any time, and online finger battery here is in use；Refer to that battery does not make offline
In.Processor 112 gets voltage battery core Acquisition Circuit in the first moment collected first battery core voltage value and electric current
The first current value that acquisition module 114 acquires.
Step S210: according to preset delay, the battery is obtained in the second battery core voltage value at the second moment and
Two current values；
Preferably, preset delay can be T milliseconds.Second moment can for first moment T millisecond after when
It carves.Wherein, T can be set according to the demand of user, such as T=50ms.Processor 112 gets voltage battery core Acquisition Circuit and exists
Collected second voltage battery core value and circuit acquisition module 114 collected second at the time of after 50 milliseconds of first moment
Current value.
Step S220: by the current differential between first current value and second current value of the battery and in advance
If current threshold compare；
Preferably, by current differential between first current value of the battery and second current value and default
Current threshold made the difference or be quotient and compared.
Wherein, preset current threshold can be set according to the demand of user.For example, the preset current threshold can be
20A。
Step S230: if the current differential is greater than preset current threshold, according to the current differential, described first
Battery core voltage value and the second battery core voltage value, are calculated the initial internal resistance value of the battery；
If the current differential be greater than preset current threshold, according to current differential, the first battery core voltage value and
Numerical value calculating is done between the second battery core voltage value, the initial internal resistance value of the battery can be calculated.
Step S240: be based on above step, obtain internal resistance of cell value of the battery under different state-of-charges, obtain to
A few initial internal resistance value；
According to step S200- step S230, internal resistance of cell value of the battery under different state-of-charges can be obtained, is obtained
To at least one initial internal resistance value.
Step S250: algorithm process is filtered at least one described initial internal resistance value, obtains the internal resistance of the battery
Estimated value.
It regard at least one described initial internal resistance value as input, is filtered algorithm process, the battery can be obtained
Internal resistance estimated value.
Internal resistance of cell evaluation method provided in an embodiment of the present invention, by obtaining the battery in first electricity at the first moment
Core voltage value and the first current value；According to preset delay, the battery is obtained in the second battery core voltage value at the second moment
And second current value；By the current differential between first current value and second current value of the battery and preset
Current threshold compare；If the current differential is greater than preset current threshold, according to the current differential, described the
One battery core voltage value and the second battery core voltage value, are calculated the initial internal resistance value of the battery；Based on above step,
Internal resistance of cell value of the battery under different state-of-charges is obtained, at least one initial internal resistance value is obtained；To described at least one
A initial internal resistance value is filtered algorithm process, obtains the internal resistance estimated value of the battery.
Second embodiment
Referring to figure 3., the embodiment of the invention provides a kind of internal resistance of cell evaluation methods, are applied to battery management system,
For the battery management system for managing battery pack, the battery pack includes N batteries, which comprises
Step S300: the battery is obtained in the first battery core voltage value at the first moment and the first current value；
Voltage battery core Acquisition Circuit acquires the battery core voltage of the battery at the first moment, is defined as the first battery core of the battery
Voltage value；Current acquisition module the first moment of ability acquires the battery core voltage of the battery, is defined as the first current value of the battery.Place
Reason device 112 gets voltage battery core Acquisition Circuit in the first moment collected first battery core voltage value and current acquisition module
First current value of 114 acquisitions.
Step S310: according to preset delay, the battery is obtained in the second battery core voltage value at the second moment and
Two current values；
Preferably, preset delay can be T milliseconds.Second moment can for first moment T millisecond after when
It carves.Wherein, T can be set according to the demand of user, such as T=50ms.Second moment can be for the 50 of the first moment
At the time of after millisecond.Processor 112 collects at the time of getting voltage battery core Acquisition Circuit after 50 milliseconds of the first moment
The battery voltage battery core value, the second battery core voltage value and the circuit acquisition module 114 for being defined as the battery be collected
Current value is defined as the second current value of the battery.
Step S320: by the current differential between first current value and second current value of the battery and in advance
If current threshold compare, judge whether the current differential is greater than preset current threshold.
Wherein, preset current threshold is set according to the demand of user.For example, the preset current threshold can be
20A。
As an implementation, the current differential and preset electric current the first moment and the second moment got twice
Threshold value make the difference comparing.
As an implementation, the current differential that the first moment and the second moment get twice can also be taken absolutely
Compared with value after value is made the difference with preset current threshold.
Step S330: if the current differential is greater than preset current threshold, according to the current differential, described first
Battery core voltage value and the second battery core voltage value, are calculated the initial internal resistance value of the battery；
Specifically, if the current differential is greater than preset current threshold, according to the first battery core voltage value and the second battery core
The initial internal resistance value of the battery is calculated divided by the current differential in the difference of voltage value.
Preferably, in order to avoid calculation overflow mistake, the absolute value of the current differential or the current differential is greater than pre-
If current threshold.For example, if the current differential is the number of 0 or very little, according to the first battery core voltage value and second
The difference of battery core voltage value is divided by the current differential, then just will appear calculation overflow mistake.
In the present embodiment, the battery can be lithium ion battery.Referring to figure 4., in battery management system
In (Battery Management System, BMS), there is N to save lithium ion battery (Bi, i=1 ... ... N) be electrically connected in series to
The battery management system, corresponding battery open circuit voltage values are respectively (Uoi, i=1 ... ... N).With B1For, M1For lithium ion
A kind of equivalent-circuit model of battery, including ohmic internal resistance R0, polarization resistance Rpa, polarization capacity Cpa.The internal resistance of battery refers to
At work, electric current flows through resistance suffered by inside battery to battery, it includes ohmic internal resistance and polarization resistance.Ohmic internal resistance master
Refer to and is made of the contact resistance of electrode material, electrolyte, membrane electrical resistance and part, the size, structure, dress with battery
With etc. it is related.Polarization resistance refers to that the positive electrode and negative electrode of battery polarize caused internal resistance when being electrochemically reacted.Battery
Internal resistance be not constant, the constantly variation at any time in charge and discharge process, this is because the composition of active material, electrolyte it is dense
Degree and temperature are all constantly changing.Ohmic internal resistance abides by Ohm's law；Polarization resistance increases with current density and is increased, but not
It is linear relationship, it is often linearly increasing with the logarithm increase of current density.
Further, in the present embodiment, according to the difference of the first battery core voltage value and the second battery core voltage value divided by institute
Current differential is stated, the initial internal resistance value of the battery is calculated.The initial internal resistance value refers to the ohmic internal resistance of the battery.Example
Such as, i.e. the ohmic internal resistance of the batteryWherein, U1The the first battery core voltage obtained for the battery at the first moment
Value, I1For the first current value that the battery obtains at the first moment, U2The the second battery core voltage obtained for the battery at the second moment
Value, I2The second current value obtained for the battery at the second moment.
It is understood that getting the first battery core voltage value and the first current value, the second electricity in two moment batteries
Core voltage value and the second current value, by the delay of Millisecond, it is possible thereby to exclude polarization resistance and polarization capacity in ohm
Hinder the influence of measurement accuracy.
Step S340: be based on above step, obtain internal resistance of cell value of the battery under different state-of-charges, obtain to
A few initial internal resistance value；
State-of-charge, (State of Charge, SOC) are also remaining capacity, representative be battery using a period of time or
The ratio of the capacity of residual capacity and its fully charged state after lying idle for a long time, commonly using percentage indicates.Its value model
Enclosing is 0~1, indicates that battery discharge is complete as SOC=0, indicates that battery is completely filled with as SOC=1.
According to step S300- step S330, same method and step can obtain electricity of the battery under different state-of-charges
Pond internal resistance value obtains at least one initial internal resistance valueI is indicated in the state of different SOC values.It is indicated with percentage, example
Such as, SOC value can be 10%, 20%, 30% ... 100%.
As an implementation, the SOC value of battery is S1~S2In range, by obtaining t respectively1、t2……tmMoment
Battery core voltage valueAnd current valueIt will be between the current value of the later moment in time of the battery and the current value of later moment in time
Current differential compared with preset current threshold, obtain the current differential be greater than preset current threshold the case where
Under, further according to battery core voltage value and current value that later moment in time and previous moment are got, it is initial interior that at least one is calculated
Resistance value isWherein, S1~S2It can be 40%~100%；tiWith ti-1Between default delay can phase
Together, it can also be different；I=1,2 ... m.
Step S350: whether at least one initial internal resistance value meets preset condition；
The preset condition includes: the initial internal resistance value within the scope of preset resistance value.
Judge each initial internal resistance value whether within the scope of preset resistance value one by one.In order to improve the accurate of the method
Property, if some initial internal resistance value not within the scope of preset resistance value, gives up the initial internal resistance value；If some initial internal resistance value
Within the scope of preset resistance value, then retain the initial internal resistance value.In this way, having got rid of useless data, retain effective number
According to, improve internal resistance estimation precision.Wherein, the preset resistance value range is [Rmim,Rmax].As a kind of embodiment party
Formula can be by repeatedly surveying under different temperatures, different SOC according in the practical application of battery, such as in electric car
The internal resistance of multiple single batteries is measured, to obtain internal resistance minimum value RminWith internal resistance maximum value Rmax.The internal resistance of various types battery
It is worth related with temperature, SOC.For example, the C/LiFePO4 monocell internal resistance of 150Ah/3.2V is 1.0-1.4m Ω.Or
300Ah/3.2V C/LiFePO4 monocell internal resistance be 0.6-1.8m Ω.
Step S360: at least one internal resistance to be filtered for meeting preset condition at least one described initial internal resistance value is obtained
Value；
The preset condition includes: the initial internal resistance value within the scope of preset resistance value.
In at least one initial internal resistance value, judge each initial internal resistance value whether in preset resistance value range one by one
It is interior, if some initial internal resistance value within the scope of preset resistance value, retains the initial internal resistance value.In this way, described in obtaining at least
At least one internal resistance value to be filtered in one initial internal resistance value within the scope of preset resistance value.
Step S370: algorithm process is filtered at least one described internal resistance value to be filtered, obtains the interior of the battery
Hinder estimated value.
Preferably, the filtering algorithm can be first-order filtering or Kalman filtering algorithm.
Since the acquisition of voltage and current has phase deviation in the actual process, inevitably measurement is introduced and is missed
Difference, these errors lead to the actual measured value for relying on internal resistance merely, are unable to reach using precision.Meanwhile it can determine in battery
Resistance is a variable signal at a slow speed, and can be considered as in SOC a small range constant.On the basis of it is assumed herein that, in single battery
The actual measured value of resistance can obtain estimating for single battery by correlation filterings such as kalman, first-order filterings as input
Calculate internal resistance.
Next the estimation internal resistance of acquisition battery is illustrated with Kalman filtering.
Kalman filtering (Kalman filtering) is a kind of using linear system state equation, is inputted by system defeated
Data are observed out, and the algorithm of optimal estimation is carried out to system mode.
In general in the dynamical system of battery, its output is often history value and functional relation currently entered.
Assuming that this system has a state variable, which determined by the historic state of system.Current system exports only
It is determined, is not influenced by history input with current state variable by currently inputting.At least one described internal resistance value to be filtered is carried out
Kalman filtering processing, obtains the internal resistance estimated value of the battery.It is a variable signal at a slow speed based on the internal resistance of cell, in difference
Under SOC, the variation of the internal resistance of cell meets linear random differential system.At least one internal resistance value to be filtered according to respectively calculate when
Between series arrangement, i.e. Rk.Wherein, k=t1、t2……tm.K can also indicate different state-of-charges.
It in the present embodiment, include the measured value R of a present status k at least one internal resistance value to be filteredgc, have below
Five formula illustrate.
First with the process model of system, come the system for predicting NextState.Assuming that present system mode is k, root
According to formula (1), can the laststate based on system and predict present status, whereinIt is pre- using laststate
Survey as a result,It is that laststate is optimal as a result, UkFor the control amount of standing state, here without control amount, Uk
It can be 0.
Till now, system results have had updated, and next updateCovariance.In formula (2),It isCorresponding covariance,It isCorresponding covariance, Q are systematic procedure
Covariance.Q reflects the internal resistance value variance at two continuous moment, can set initial value according to the demand of user.For example, Q can be with
For 3e-4。
Prediction result based on present status, then obtain the measured value R of present statusgc, available now by formula (3)
The optimization estimated value of state kWherein, KgFor kalman gain, K can be obtained by formula (4)g。KgReflect battery
The credibility of internal resistance measurement value and process model (i.e. current time this model identical as subsequent time internal resistance value).R is to survey
Error is measured, R reflects the measurement accuracy of internal resistance value, can set initial value according to the demand of user.For example, R can be 0.05.
Maximum likelihood estimate under k-state achieved aboveIn order to enable Kalman filtering algorithm be constantly running down directly
Terminate to systematic procedure, is updated under k-state by formula (5) with thisCovariance
In this way, being based at least one internal resistance value, that is, R to be filteredk, wherein k=t1、t2……tm.Constantly recursive iteration,
Until systematic procedure terminates, the optimization estimated value of battery under different moments or different state-of-charges is obtainedI.e.For the internal resistance estimated value under battery different moments or different state-of-charges.
Kalman filter method is suitable for various batteries.This method is not punctual in measurement internal resistance initial value, can make in measurement
The estimated value of resistance is constantly being restrained to true value.Kalman filter method can not only provide the estimated value of measurement internal resistance, moreover it is possible to
Give the evaluated error range of measurement internal resistance.
It is understood that data filtering is to remove a kind of data processing technique of noise reduction truthful data.The filter
Wave algorithm can also include the algorithm that data are carried out with smothing filtering.
Furthermore, it is possible to utilize the internal resistance estimated value of battery according to the above method, cell health state is obtained.The internal resistance of cell is
Reflect one of the key parameter of cell health state.The statistical information of internal resistance is estimated by every a string of batteries, estimates present battery
The health status of group.In the present embodiment, by above-mentioned internal resistance of cell evaluation method, each batteries in series-connected cell group are obtained
Estimation internal resistance, most can accurately reflect the health status of battery pack.
Internal resistance of cell evaluation method provided in an embodiment of the present invention, by obtaining the battery in first electricity at the first moment
Core voltage value and the first current value；According to preset delay, the battery is obtained in the second battery core voltage value at the second moment
And second current value；By the current differential between first current value and second current value of the battery and preset
Current threshold compare；If the current differential is greater than preset current threshold, according to the current differential, described the
One battery core voltage value and the second battery core voltage value, are calculated the initial internal resistance value of the battery；Based on above step,
Internal resistance of cell value of the battery under different state-of-charges is obtained, at least one initial internal resistance value is obtained；To described at least one
A initial internal resistance value is filtered algorithm process, obtains the internal resistance estimated value of the battery, is not increasing battery management system with this
Under the premise of cost of uniting, the high-precision internal resistance value of on-line measurement battery is realized.
3rd embodiment
Referring to figure 5., the embodiment of the invention provides a kind of internal resistances of cell to estimate device 400, is applied to battery management system
System, the battery management system is for managing battery pack, and the battery pack includes N batteries, and described device 400 includes:
First acquisition unit 410, for obtaining the battery in the first battery core voltage value at the first moment and the first electricity
Flow valuve.
Second acquisition unit 420, for obtaining the battery in the second battery core electricity at the second moment according to preset delay
Pressure value and the second current value.
Comparison unit 430, first current value for obtaining the first acquisition unit 410 are obtained with described second
The current differential between the second current value for taking unit 420 to obtain is compared with preset current threshold.
Computing unit 440, if for showing that the current differential is greater than preset current threshold according to comparison unit 430,
Then according to the current differential, the first battery core voltage value and the second battery core voltage value, the battery is calculated
Initial internal resistance value.
Third acquiring unit 450 is used for according to first acquisition unit 410, second acquisition unit 420 and computing unit 440,
Internal resistance of cell value of the battery under different state-of-charges is obtained, at least one initial internal resistance value is obtained.
Processing unit 460, for being carried out at least one initial internal resistance value described in the third acquiring unit 450 acquisition
Filtering algorithm processing, obtains the internal resistance estimated value of the battery.
It should be noted that each unit in the present embodiment can be by software code realization, under this condition, above-mentioned is each
Unit can be stored in memory 110.The above each unit can equally be realized by hardware such as IC chip.
The internal resistance of cell provided in an embodiment of the present invention estimates device, the technical effect of realization principle and generation and aforementioned the
Internal resistance of cell evaluation method embodiment in one embodiment is identical, and to briefly describe, Installation practice part does not refer to place, can
With reference to corresponding contents in preceding method embodiment.
Fourth embodiment
Fig. 6 is please referred to, the embodiment of the invention provides a kind of internal resistances of cell to estimate device 500, is applied to battery management system
System, the battery management system is for managing battery pack, and the battery pack includes N batteries, and described device 500 includes:
First acquisition unit 510, for obtaining the battery in the first battery core voltage value at the first moment and the first electricity
Flow valuve.
Second acquisition unit 520, for obtaining the battery in the second battery core electricity at the second moment according to preset delay
Pressure value and the second current value.
Comparison unit 530, first current value for obtaining the first acquisition unit 510 are obtained with described second
The current differential between the second current value for taking unit 520 to obtain is compared with preset current threshold.
Computing unit 540, if for showing that the current differential is greater than preset current threshold according to comparison unit 530,
Then according to the current differential, the first battery core voltage value and the second battery core voltage value, the battery is calculated
Initial internal resistance value.
As an implementation, computing unit 540 includes computation subunit 541.
Computation subunit 541, for according to the difference of the first battery core voltage value and the second battery core voltage value divided by the electricity
Difference is flowed, the initial internal resistance value of the battery is calculated.
Third acquiring unit 550 is used for according to first acquisition unit 510, second acquisition unit 520 and computing unit 540,
Internal resistance of cell value of the battery under different state-of-charges is obtained, at least one initial internal resistance value is obtained.
Processing unit 560, for being carried out at least one initial internal resistance value described in the third acquiring unit 550 acquisition
Filtering algorithm processing, obtains the internal resistance estimated value of the battery.
As an implementation, processing unit 560 includes the first processing subelement 561 and second processing subelement 562.
First processing subelement 561 meets preset condition at least for obtaining at least one described initial internal resistance value
One internal resistance value to be filtered.
Second processing subelement 562, at least one to be to be filtered described in obtaining to the first processing subelement 561
Internal resistance value is filtered algorithm process, obtains the internal resistance estimated value of the battery.
It should be noted that each unit in the present embodiment can be by software code realization, under this condition, above-mentioned is each
Unit can be stored in memory 110.The above each unit can equally be realized by hardware such as IC chip.
The internal resistance of cell provided in an embodiment of the present invention estimates device, the technical effect of realization principle and generation and aforementioned the
Internal resistance of cell evaluation method embodiment in two embodiments is identical, and to briefly describe, Installation practice part does not refer to place, can
With reference to corresponding contents in preceding method embodiment.
In several embodiments provided herein, it should be understood that disclosed device and method can also pass through
Other modes are realized.The apparatus embodiments described above are merely exemplary, for example, flow chart and block diagram in attached drawing
Show the device of multiple embodiments according to the present invention, the architectural framework in the cards of method and computer program product,
Function and operation.In this regard, each box in flowchart or block diagram can represent the one of a module, section or code
Part, a part of the module, section or code, which includes that one or more is for implementing the specified logical function, to be held
Row instruction.It should also be noted that function marked in the box can also be to be different from some implementations as replacement
The sequence marked in attached drawing occurs.For example, two continuous boxes can actually be basically executed in parallel, they have ready conditions
Under can also execute in the opposite order, this depends on the function involved.It is also noted that in block diagram and or flow chart
Each box and the box in block diagram and or flow chart combination, can function or movement as defined in executing it is dedicated
Hardware based system realize, or can realize using a combination of dedicated hardware and computer instructions.
In addition, each functional module in each embodiment of the present invention can integrate one independent portion of formation together
Point, it is also possible to modules individualism, an independent part can also be integrated to form with two or more modules.
If the function realized in the form of software function module and as independent product sale or use condition under,
It can store in a computer readable storage medium.Based on this understanding, technical solution of the present invention substantially or
Person says that the part of the part that contributes to existing technology or the technical solution can be embodied in the form of software products,
The computer software product is stored in a storage medium, including some instructions are used so that computer equipment (can be with
It is personal computer, server or the network equipment etc.) execute all or part of step of each embodiment the method for the present invention
Suddenly.And storage medium above-mentioned includes: USB flash disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), deposits at random
The various media that can store program code such as access to memory (RAM, Random Access Memory), magnetic or disk.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to an entity or behaviour
Make with another entity or operate distinguish, without necessarily requiring or implying between these entities or operation there are it is any this
The actual relationship of kind or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to nonexcludability
Include so that include a series of elements process, method, article or equipment not only include those elements, but also
Including other elements that are not explicitly listed, or further include for this process, method, article or equipment intrinsic want
Element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including described want
There is also other identical elements in the process, method, article or equipment of element.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.It should also be noted that similar label and letter exist
Similar terms are indicated in following attached drawing, therefore, once being defined in a certain Xiang Yi attached drawing, are then not required in subsequent attached drawing
It is further defined and explained.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain
Lid is within protection scope of the present invention.Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
Claims (10)
1. a kind of internal resistance of cell evaluation method, which is characterized in that be applied to battery management system, the battery management system is used for
Battery pack is managed, the battery pack includes N batteries, which comprises
The battery is obtained in the first battery core voltage value at the first moment and the first current value；
According to preset delay, the battery is obtained in the second battery core voltage value at the second moment and the second current value；
By the current differential and preset current threshold between first current value and second current value of the battery
It compares, wherein the preset current threshold is 20A, and described compare is compared including being made the difference or being quotient；
If the current differential be greater than preset current threshold, according to the current differential, the first battery core voltage value with
And the second battery core voltage value, the initial internal resistance value of the battery is calculated；
Based on above step, internal resistance of cell value of the battery under different state-of-charges is obtained, it is initial interior to obtain at least one
Resistance value；
Algorithm process is filtered at least one described initial internal resistance value, obtains the internal resistance estimated value of the battery, the filter
Wave algorithm includes Kalman filtering, and the Kalman filtering is a kind of using linear system state equation, is inputted by system defeated
Data are observed out, and the algorithm of optimal estimation is carried out to system mode, it is described that at least one described initial internal resistance value is filtered
Algorithm process, the internal resistance estimated value for obtaining the battery include: WithWherein, k is present
System mode,Be using laststate prediction as a result,It is that laststate is optimal as a result, Uk
For the control amount of standing state,It isCorresponding covariance,It isIt is corresponding
Covariance, Q are the covariance of systematic procedure,For the optimization estimated value of present status k, KgFor kalman gain, RgcFor
The measured value of present status, R are measurement error.
2. method described in claim 1, which is characterized in that be filtered at algorithm at least one described initial internal resistance value
Reason, obtains the internal resistance estimated value of the battery, comprising:
Obtain at least one internal resistance value to be filtered for meeting preset condition at least one described initial internal resistance value；
Algorithm process is filtered at least one described internal resistance value to be filtered, obtains the internal resistance estimated value of the battery.
3. according to method as claimed in claim 2, which is characterized in that the preset condition includes:
The initial internal resistance value is within the scope of preset resistance value.
4. the method according to claim 1, wherein according to the current differential, the first battery core voltage value
And the second battery core voltage value, the initial internal resistance value of the battery is calculated, comprising:
According to the difference of the first battery core voltage value and the second battery core voltage value divided by the current differential, the battery is calculated
Initial internal resistance value.
5. method according to claim 1-4, which is characterized in that the filtering algorithm further includes first-order filtering.
6. a kind of internal resistance of cell estimates device, which is characterized in that be applied to battery management system, the battery management system is used for
Battery pack is managed, the battery pack includes N batteries, and described device includes:
First acquisition unit, for obtaining the battery in the first battery core voltage value at the first moment and the first current value；
Second acquisition unit, for according to preset delay, obtain the battery the second moment the second battery core voltage value with
And second current value；
Comparison unit, first current value and the second acquisition unit for obtaining the first acquisition unit obtain
The second current value between current differential compared with preset current threshold, wherein the preset current threshold is
20A, described compare are compared including being made the difference or being quotient；
Computing unit, if for showing that the current differential is greater than preset current threshold according to comparison unit, according to
Current differential, the first battery core voltage value and the second battery core voltage value, are calculated the initial internal resistance of the battery
Value；
Third acquiring unit, for obtaining the battery not according to first acquisition unit, second acquisition unit and comparison unit
With the internal resistance of cell value under state-of-charge, at least one initial internal resistance value is obtained；
Processing unit, for being filtered at algorithm at least one initial internal resistance value described in third acquiring unit acquisition
Reason, obtains the internal resistance estimated value of the battery, the filtering algorithm includes Kalman filtering, and the Kalman filtering is a kind of benefit
With linear system state equation, data are observed by system input and output, the algorithm of optimal estimation is carried out to system mode, it is described
Algorithm process is filtered at least one described initial internal resistance value, the internal resistance estimated value for obtaining the battery includes:
WithWherein, k is present system mode,It is to utilize laststate
Prediction as a result,It is that laststate is optimal as a result, UkFor the control amount of standing state,It isCorresponding covariance,It isCorresponding covariance, Q are the covariance of systematic procedure,For the optimization estimated value of present status k, KgFor kalman gain, RgcFor the measured value of present status, R is that measurement misses
Difference.
7. device according to claim 6, which is characterized in that the processing unit includes:
First processing subelement, for obtain meet at least one described initial internal resistance value preset condition at least one is to be filtered
Wave internal resistance value；
Second processing subelement, for being carried out at least one internal resistance value to be filtered described in the first processing subelement acquisition
Filtering algorithm processing, obtains the internal resistance estimated value of the battery.
8. device according to claim 7, which is characterized in that the preset condition includes:
The initial internal resistance value is within the scope of preset resistance value.
9. device according to claim 6, which is characterized in that the computing unit includes:
Computation subunit, for according to the difference of the first battery core voltage value and the second battery core voltage value divided by the current differential,
The initial internal resistance value of the battery is calculated.
10. according to the described in any item devices of claim 6-9, which is characterized in that the filtering algorithm further includes first-order filtering.
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