CN106501736A - Internal resistance of cell evaluation method and device - Google Patents
Internal resistance of cell evaluation method and device Download PDFInfo
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- CN106501736A CN106501736A CN201710005855.7A CN201710005855A CN106501736A CN 106501736 A CN106501736 A CN 106501736A CN 201710005855 A CN201710005855 A CN 201710005855A CN 106501736 A CN106501736 A CN 106501736A
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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
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Abstract
A kind of internal resistance of cell evaluation method and device is embodiments provided, is related to cell art.Methods described is by obtaining first battery core magnitude of voltage and first current value of the battery at the first moment；According to default time delay, second battery core magnitude of voltage and second current value of the battery at the second moment is obtained；By the first current value of the battery and state the current differential between the second current value and contrasted with default current threshold；If current differential is calculated the initial internal resistance value of the battery more than default current threshold according to the current differential, the first battery core magnitude of voltage and the second battery core magnitude of voltage；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 initial internal resistance value, the internal resistance estimated value of battery is obtained, with this on the premise of battery management system cost is not increased, is realized the internal resistance value of on-line measurement battery.
Description
Technical field
The present invention relates to cell art, in particular to a kind of internal resistance of cell evaluation method and device.
Background technology
In recent years, lithium-ion-power cell group large-scale application in electric automobile, large-scale energy-accumulating power station, back-up source
Etc. the important events for needing secondary cell.Have that energy is big, discharge voltage is high, have extended cycle life due to lithium ion battery, without note
Recall effect, have quick charge capability, self-discharge rate little, numerous with multiple safety precautions, good seal, environmental protection etc.
Advantage, progressively 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 automobile large area
Popularization, its correlation technique also obtained rapid progress and development.Dynamical lithium-ion battery packs also large-area application
To on electric automobile.
Internal resistance, used as one of key character for characterizing dynamical lithium-ion battery packs health status.Presently, there are a lot of estimations
The method of the internal resistance of cell, such as direct-current discharge internal resistance measurement method, alternating current bridge method etc..Existing method mostly concentrates on directly survey
Amount technology, even also need to increase extra hardware cost.Although certainty of measurement is higher, all it is off-line measurement method, for
Run on the battery in actual vehicle, existing method causes the increase of measurement cost, or the decline for causing certainty of measurement.
Content of the invention
In view of this, a kind of internal resistance of cell evaluation method and device are embodiments provided, to improve the problems referred to above.
In a first aspect, embodiments providing a kind of internal resistance of cell evaluation method, battery management system is applied to, institute
Battery management system is stated for managing battery pack, the battery pack includes that N batteries, methods described include that obtaining the battery exists
The first battery core magnitude of voltage at the first moment and the first current value；According to default time delay, the battery is obtained at the second moment
The second battery core magnitude of voltage and the second current value；By between first current value and second current value of the battery
Current differential contrasted with default current threshold；If the current differential is more than default current threshold, according to institute
Current differential, the first battery core magnitude of voltage and the second battery core magnitude of voltage is stated, the initial interior of the battery is calculated
Resistance；Based on above step, internal resistance of cell value of the battery under different state-of-charges is obtained, obtain at least one initial interior
Resistance；Algorithm process is filtered at least one initial internal resistance value, the internal resistance estimated value of the battery is obtained.
Second aspect, embodiments provides a kind of internal resistance of cell estimation device, is applied to battery management system, institute
Battery management system is stated for managing battery pack, the battery pack includes that N batteries, described device include：First acquisition unit,
For obtaining first battery core magnitude of voltage and first current value of the battery at the first moment；Second acquisition unit, for root
According to default time delay, second battery core magnitude of voltage and second current value of the battery at the second moment is obtained；Comparison unit, uses
The second current value obtained with the second acquisition unit in first current value for obtaining the first acquisition unit it
Between current differential contrasted with default current threshold；Computing unit, if for drawing the electric current according to comparison unit
Difference is more than default current threshold, then according to the current differential, the first battery core magnitude of voltage and second battery core
Magnitude of voltage, is calculated the initial internal resistance value of the battery；3rd acquiring unit, for based on above step, obtaining the electricity
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 described 3rd
At least one initial internal resistance value that acquiring unit is obtained is filtered algorithm process, obtains the internal resistance estimation of the battery
Value.
A kind of internal resistance of cell evaluation method provided in an embodiment of the present invention and device, methods described is by obtaining the battery
The first battery core magnitude of voltage and the first current value at the first moment；According to default time delay, the acquisition battery is at second
The the second battery core magnitude of voltage that carves and the second current value；By first current value of the battery and second current value it
Between current differential contrasted with default current threshold；If the current differential is more than default current threshold, basis
The current differential, the first battery core magnitude of voltage and the second battery core magnitude of voltage, 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, at least one is obtained initial
Internal resistance value；Algorithm process is filtered at least one initial internal resistance value, the internal resistance estimated value of the battery is obtained, with this
On the premise of battery management system cost is not increased, the high accuracy internal resistance value of on-line measurement battery is realized.
Description of the drawings
In order to be illustrated more clearly that the technical scheme of the embodiment of the present invention, below by to be used attached needed for embodiment
Figure is briefly described, it will be appreciated that the following drawings illustrate only certain embodiments of the present invention, and it is right to be therefore not construed as
The restriction of scope, for those of ordinary skill in the art, on the premise of not paying creative work, can be with according to this
A little accompanying drawings obtain other related accompanying drawings.
Fig. 1 is a kind of structured flowchart of the electronic equipment that can be applicable in the embodiment of the present invention；
The flow chart of the internal resistance of cell evaluation method that Fig. 2 is provided for first embodiment of the invention；
The flow chart of the internal resistance of cell evaluation method that Fig. 3 is provided for second embodiment of the invention；
The schematic diagram of the equivalent-circuit model of the internal resistance of cell evaluation method that Fig. 4 is provided for second embodiment of the invention；
Fig. 5 estimates the structured flowchart of device for the internal resistance of cell that third embodiment of the invention is provided；
Fig. 6 estimates the structured flowchart of device for the internal resistance of cell that fourth embodiment of the invention is provided.
Specific embodiment
Purpose, technical scheme and advantage for making the embodiment of the present invention is clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, to the embodiment of the present invention in technical scheme be clearly and completely described, it is clear that described embodiment is
The a part of embodiment of the present invention, rather than whole embodiments.Present invention enforcement generally described and illustrated in accompanying drawing herein
The component of example can be arranged and be designed with a variety of configurations.
Therefore, below the detailed description of the embodiments of the invention for providing in the accompanying drawings is not intended to limit claimed
The scope of the present invention, but be merely representative of the present invention selected embodiment.Embodiment in based on the present invention, this area are common
The every other embodiment obtained under the premise of creative work is not made by technical staff, belongs to the model of present invention protection
Enclose.
It should be noted that：Similar label and letter represent similar terms in following accompanying drawing, therefore, once a certain Xiang Yi
It is defined in individual accompanying drawing, then in subsequent accompanying drawing which further need not be defined and be explained.
In describing the invention, it should be noted that term " first ", " second ", " the 3rd " etc. are only used for differentiation and retouch
State, and it is not intended that indicating or hint relative importance.
Fig. 1 is referred to, Fig. 1 shows a kind of structured flowchart of the electronic equipment 100 that can be applicable in the embodiment of the present invention.
The electronic equipment 100 can as user terminal, or computer or server, the user terminal can be mobile phone,
Panel computer or car-mounted terminal.The user terminal can also be power motor, and the power motor can apply to electronic vapour
Car.As shown in figure 1, electronic equipment 100 can be estimated including memory 110, storage control 111, processor 112 and the internal resistance of cell
Calculate device.
Directly or indirectly electrically connect between memory 110, storage control 111,112 each element of processor, to realize
The transmission or interaction of data.For example, one or more communication bus can be passed through between these elements or signal bus realizes electricity
Connection.Internal resistance of cell evaluation method includes that at least one can be stored in the form of software or firmware (firmware) respectively
Software function module in reservoir 110, software function module or computer journey that for example described internal resistance of cell estimation device includes
Sequence.
Memory 110 can store various software programs and module, and the internal resistance of cell that such as the embodiment of the present application is provided is estimated
Calculate the corresponding programmed instruction/module of method and device.Processor 112 stores software program in the memory 110 by operation
And module, so as to execute various function application and data processing, that is, realize the internal resistance of cell estimation in 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 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 storage (Electric Erasable Programmable Read-Only Memory, EEPROM) etc..
Processor 112 can be a kind of IC chip, with 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.；Can also be digital signal processor (DSP), special IC (ASIC), ready-made programmable
Gate array (FPGA) or other PLDs, discrete gate or transistor logic, discrete hardware components.Which can
With the disclosed each method in realization or execution the embodiment of the present application, step and logic diagram.General processor can be micro-
Processor or the processor can also be any conventional processors 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 for the battery core voltage gathered in battery pack per batteries and passes to the place
Reason 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 N roads battery core voltage collection circuit.Per batteries to there is 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 used for gathering in battery pack the electric current of each series-connected cell and passing to the processor
112.
First embodiment
Fig. 2 is refer to, a kind of battery evaluation method is embodiments provided, is applied to battery management system, described
Battery management system is used for managing battery pack, and the battery pack includes that N batteries, methods described include：
Step S200：Obtain first battery core magnitude of voltage and first current value of the battery at the first moment；
Voltage battery core Acquisition Circuit gathers the battery core voltage of the battery at the first moment, is defined as the first battery core of the battery
Magnitude of voltage；Current acquisition module gathers the battery core voltage of the battery at the first moment, is defined as the first current value of the battery.Institute
It can be battery online any time to state for the first moment, and online finger battery here is in use；Refer to that battery does not make offline
With in.Processor 112 gets the first battery core magnitude of voltage and the electric current that voltage battery core Acquisition Circuit is collected at the first moment
First current value of the collection of acquisition module 114.
Step S210：According to default time delay, second battery core magnitude of voltage and the of the battery at the second moment is obtained
Two current values；
Preferably, default time delay can be T milliseconds.Second moment can be first moment T milliseconds after when
Carve.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
The second voltage battery core value and circuit acquisition module 114 that moment after 50 milliseconds of first moment collects collect second
Current value.
Step S220：By the current differential between first current value and second current value of the battery with pre-
If current threshold contrasted；
Preferably, by the current differential between first current value and second current value of the battery with default
Current threshold made the difference or be business and compared.
Wherein, default current threshold can be set according to the demand of user.For example, the default current threshold can be
20A.
Step S230：If the current differential be more than default current threshold, according to the current differential, described first
Battery core magnitude of voltage and the second battery core magnitude of voltage, are calculated the initial internal resistance value of the battery；
If the current differential be more than default current threshold, according to current differential, the first battery core magnitude of voltage and
Numerical computations are done between the second battery core magnitude of voltage, the initial internal resistance value of the battery can be calculated.
Step S240：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, it is possible to obtain internal resistance of cell value of the battery under different state-of-charges, obtain
To at least one initial internal resistance value.
Step S250：Algorithm process is filtered at least one initial internal resistance value, the internal resistance of the battery is obtained
Estimated value.
Using at least one initial internal resistance value as input, algorithm process is filtered, it is possible to obtain the battery
Internal resistance estimated value.
Internal resistance of cell evaluation method provided in an embodiment of the present invention, by obtaining first electricity of the battery at the first moment
Core magnitude of voltage and the first current value；According to default time delay, second battery core magnitude of voltage of the battery at the second moment is obtained
And second current value；By the current differential between first current value and second current value of the battery with default
Current threshold contrasted；If the current differential is more than default current threshold, according to the current differential, described the
One battery core magnitude of voltage and the second battery core magnitude of voltage, are calculated the initial internal resistance value of the battery；It is 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
Individual initial internal resistance value is filtered algorithm process, obtains the internal resistance estimated value of the battery.
Second embodiment
Fig. 3 is refer to, a kind of internal resistance of cell evaluation method is embodiments provided, is applied to battery management system,
The battery management system is used for managing battery pack, and the battery pack includes that N batteries, methods described include：
Step S300：Obtain first battery core magnitude of voltage and first current value of the battery at the first moment；
Voltage battery core Acquisition Circuit gathers the battery core voltage of the battery at the first moment, is defined as the first battery core of the battery
Magnitude of voltage；Current acquisition module the first moment of ability gathers the battery core voltage of the battery, is defined as the first current value of the battery.Place
Reason device 112 gets the first battery core magnitude of voltage and the current acquisition module that voltage battery core Acquisition Circuit is collected at the first moment
First current value of 114 collections.
Step S310：According to default time delay, second battery core magnitude of voltage and the of the battery at the second moment is obtained
Two current values；
Preferably, default time delay can be T milliseconds.Second moment can be first moment T milliseconds after when
Carve.Wherein, T can be set according to the demand of user, such as T=50ms.Second moment can be the 50 of the first moment
Moment after millisecond.Processor 112 gets moment of the voltage battery core Acquisition Circuit after 50 milliseconds of the first moment and collects
The battery voltage battery core value, be defined as the second battery core magnitude of voltage of the battery, and circuit acquisition module 114 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 with pre-
If current threshold contrasted, judge the current differential whether more than default current threshold.
Wherein, default current threshold is set according to the demand of user.For example, the default current threshold can be
20A.
As a kind of embodiment, the current differential that the first moment and the second moment are got twice and default electric current
Threshold value carries out making the difference comparing.
As a kind of embodiment, it is also possible to take definitely the current differential that the first moment and the second moment get twice
Value after value carries out making the difference comparing with default current threshold.
Step S330：If the current differential be more than default current threshold, according to the current differential, described first
Battery core magnitude of voltage and the second battery core magnitude of voltage, are calculated the initial internal resistance value of the battery；
Specifically, if the current differential is more than default current threshold, according to the first battery core magnitude of voltage and the second battery core
The difference of magnitude of voltage is calculated the initial internal resistance value of the battery divided by the current differential.
Preferably, in order to avoid the absolute value of calculation overflow mistake, the current differential or the current differential is more than pre-
If current threshold.For example, if the current differential is 0 or the number of very little, then according to the first battery core magnitude of voltage and second
The difference of battery core magnitude of voltage is divided by the current differential, then calculation overflow mistake just occurs.
In the present embodiment, the battery can be lithium ion battery.Fig. 4 is refer to, in battery management system
In (Battery Management System, BMS), there are N section 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 B1As a example by, 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 is referred to
Operationally, electric current flows through the resistance suffered by inside battery to battery, and it includes ohmic internal resistance and polarization resistance.Ohmic internal resistance master
Refer to and be made up of the contact resistance of electrode material, electrolyte, membrane electrical resistance and part, size, structure with battery, dress
With etc. relevant.Polarization resistance refers to that the positive pole of battery and negative pole polarize when being electrochemically reacted caused internal resistance.Battery
Internal resistance be not constant, be continually changing with the time in charge and discharge process, this is because the composition of active material, electrolyte dense
Degree and temperature are all constantly changing.Ohmic internal resistance observes Ohm's law；Polarization resistance increases with current density and increases, but not
It is linear relationship, often linearly increasing with the logarithm increase of current density.
Further, in the present embodiment, according to the difference of the first battery core magnitude of voltage and the second battery core magnitude of voltage 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, U1For the first battery core voltage that the battery was obtained at the first moment
Value, I1For the first current value that the battery was obtained at the first moment, U2For the second battery core voltage that the battery was obtained at the second moment
Value, I2For the second current value that the battery was obtained at the second moment.
It is understood that getting the first battery core magnitude of voltage and the first current value, the second electricity in two moment batteries
Core magnitude of voltage and the second current value, by the time delay of Millisecond, it is possible thereby to exclude polarization resistance and polarization capacity in ohm
The impact of resistance certainty of measurement.
Step S340：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) is also dump energy, 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, conventional percentage are represented.Its value model
Enclose for 0～1, represent as SOC=0 as SOC=1, battery discharge completely, represents that battery is completely filled with.
According to step S300- step S330, same method and step, it is possible to obtain electricity of the battery under different state-of-charges
Pond internal resistance value, obtains at least one initial internal resistance valueIn the state of i represents different SOC values.Represented with percentage, example
Such as, SOC value can be 10%, 20%, 30% ... 100%.
Used as a kind of embodiment, the SOC value of battery is S1～S2In the range of, by obtaining t respectively1、t2……tmMoment
Battery core magnitude of voltageAnd current valueBy between the current value of the later moment in time of the battery and the current value of later moment in time
Current differential contrasted with default current threshold, draw the current differential more than default current threshold situation
Under, the battery core magnitude of voltage got further according to later moment in time and previous moment and current value, be calculated at least one initial in
Resistance isWherein, S1～S2Can be 40%～100%；tiWith ti-1Between default time delay can phase
With, it is also possible to different；I=1,2 ... m.
Step S350：It is pre-conditioned whether at least one initial internal resistance value meets；
Described pre-conditioned including：The initial internal resistance value is in the range of default resistance value.
Judge each initial internal resistance value whether in the range of default resistance value one by one.In order to improve the accurate of methods described
Property, if certain initial internal resistance value is not in the range of default resistance value, give up the initial internal resistance value；If certain initial internal resistance value
In the range of default resistance value, then retain the initial internal resistance value.So, useless data have been got rid of, has retained effectively number
According to, improve internal resistance estimation precision.Wherein, the default resistance value scope is [Rmim,Rmax].As a kind of embodiment party
Formula, according in the practical application of battery, such as in electric automobile, in different temperatures, can pass through repeatedly survey under different SOC
The internal resistance of multiple cells is measured, so as to obtain internal resistance minimum of a value RminWith internal resistance maximum Rmax.The internal resistance of all kinds battery
Value is relevant with temperature, SOC.For example, the C/LiFePO4 monocells internal resistance of 150Ah/3.2V is 1.0-1.4m Ω.Or
300Ah/3.2V the internal resistance of C/LiFePO4 monocells be 0.6-1.8m Ω.
Step S360：Obtain and at least one initial internal resistance value, meet the internal resistance to be filtered of pre-conditioned at least one
Value；
Described pre-conditioned including：The initial internal resistance value is in the range of default resistance value.
In at least one initial internal resistance value, judge each initial internal resistance value whether in default resistance value scope one by one
Interior, if certain initial internal resistance value is in the range of default resistance value, retain the initial internal resistance value.Thus, described in obtaining at least
At least one internal resistance value to be filtered in one initial internal resistance value in the range of the default resistance value.
Step S370：Algorithm process is filtered to described at least one internal resistance value to be filtered, the interior of the battery is obtained
Resistance estimated value.
Preferably, the filtering algorithm can be first-order filtering or Kalman filtering algorithm.
As the collection of voltage and current has phase deviation in real process, inevitably measurement is introduced and is missed
Difference, these errors cause actual measured value merely by internal resistance, it is impossible to reach application precision.Simultaneously, it may be determined that in battery
Resistance is a variable signal at a slow speed, and can be considered as in SOC a small ranges constant.It is assumed herein that on the basis of, with cell
The actual measured value of resistance can pass through the correlation filterings such as kalman, first-order filtering, obtain estimating for cell as input
Calculate internal resistance.
Next the estimation internal resistance for obtaining battery is illustrated with Kalman filtering.
Kalman filtering (Kalman filtering) is a kind of using linear system state equation, is input into by system defeated
Go out to observe data, the algorithm for carrying out optimal estimation to system mode.
In general, in the dynamical system of battery, its output is often history value and the functional relation being currently input into.
Assume that this system has a state variable, the state variable is determined by the historic state of system.Current system is only exported
Determined by current input and current state variable, do not affected by history input.Described at least one internal resistance value to be filtered is carried out
Kalman filtering process, 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 change of the internal resistance of cell meets linear random differential system.At least one internal resistance value to be filtered according to each calculate when
Between series arrangement, i.e. Rk.Wherein, k=t1、t2……tm.K can also represent different state-of-charges.
In the present embodiment, at least one internal resistance value to be filtered includes the measured value R of a present status kgc, below have
Five formula are illustrating.
First with the process model of system, the system for predicting NextState.Assume that present system mode is k, root
According to formula (1), present status can be predicted based on the laststate of system, wherein,It is pre- using laststate
The result of survey,It is the optimum result of laststate, UkFor the controlled quentity controlled variable of standing state, here without controlled quentity controlled variable, Uk
Can be 0.
Till now, system results have updated, and next updateCovariance.In formula (2),It isCorresponding covariance,It isCorresponding covariance, associations of the Q for systematic procedure
Variance.Q reflects the internal resistance value variance at two continuous moment, can set initial value according to the demand of user.Such as, Q can be
3e-4.
Predicting the outcome based on present status, then obtain the measured value R of present statusgc, can be obtained till 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 with subsequent time internal resistance value).R is survey
Amount error, R reflect the certainty of measurement of internal resistance value, can set initial value according to the demand of user.Such as, R can be 0.05.
Maximum likelihood estimate under k-state achieved aboveIn order to make Kalman filtering algorithm be constantly running down directly
Terminate to systematic procedure, updated under k-state with this by formula (5)Covariance
So, it is R based at least one internal resistance value to be filteredk, wherein, k=t1、t2……tm.Constantly recursive iteration,
Until systematic procedure terminates, the optimization estimated value of not battery in the same time or under different state-of-charge is obtainedI.e.For battery internal resistance estimated value not in the same time or under different state-of-charges.
Kalman filter method is applied to various batteries.The method is not punctual in measurement internal resistance initial value, can make in measurement
The estimate of resistance is constantly being restrained to actual value.Kalman filter method can not only provide the estimate of measurement internal resistance, moreover it is possible to
Give the evaluated error scope of measurement internal resistance.
It is understood that data filtering is to remove a kind of data processing technique that noise reduces True Data.The filter
Ripple algorithm can also include the algorithm that data are carried out with smothing filtering.
Furthermore, it is possible to obtain cell health state according to said method using the internal resistance estimated value of battery.The internal resistance of cell is
One of key parameter of reflection cell health state.The statistical information that 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 battery are obtained
Estimation internal resistance, which 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 first electricity of the battery at the first moment
Core magnitude of voltage and the first current value；According to default time delay, second battery core magnitude of voltage of the battery at the second moment is obtained
And second current value；By the current differential between first current value and second current value of the battery with default
Current threshold contrasted；If the current differential is more than default current threshold, according to the current differential, described the
One battery core magnitude of voltage and the second battery core magnitude of voltage, are calculated the initial internal resistance value of the battery；It is 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
Individual 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
On the premise of system cost, the high accuracy internal resistance value of on-line measurement battery is realized.
3rd embodiment
Fig. 5 is refer to, a kind of internal resistance of cell estimation device 400 is embodiments provided, is applied to battery management system
System, the battery management system are used for managing battery pack, and the battery pack includes that N batteries, described device 400 include：
First acquisition unit 410, for obtaining first battery core magnitude of voltage and first electricity of the battery at the first moment
Flow valuve.
Second acquisition unit 420, for according to default time delay, obtaining second battery core electricity of the battery at the second moment
Pressure value and the second current value.
Comparison unit 430, first current value and described second for obtaining the first acquisition unit 410 are obtained
The current differential taken between the second current value of the acquisition of unit 420 is contrasted with default current threshold.
Computing unit 440, if for drawing the current differential more than default current threshold according to comparison unit 430,
Then according to the current differential, the first battery core magnitude of voltage and the second battery core magnitude of voltage, the battery is calculated
Initial internal resistance value.
3rd acquiring unit 450, 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 carrying out at least one initial internal resistance value that the 3rd acquiring unit 450 is obtained
Filtering 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 the conditions of this, above-mentioned is each
Unit can be stored in memory 110.Above each unit equally can be realized by hardware such as IC chip.
Device estimated by the internal resistance of cell provided in an embodiment of the present invention, and which realizes the technique effect of principle and generation and aforementioned the
Internal resistance of cell evaluation method embodiment in one embodiment is identical, is brief description, in place of device embodiment part does not refer to, can
With reference to corresponding contents in preceding method embodiment.
Fourth embodiment
Fig. 6 is refer to, a kind of internal resistance of cell estimation device 500 is embodiments provided, is applied to battery management system
System, the battery management system are used for managing battery pack, and the battery pack includes that N batteries, described device 500 include：
First acquisition unit 510, for obtaining first battery core magnitude of voltage and first electricity of the battery at the first moment
Flow valuve.
Second acquisition unit 520, for according to default time delay, obtaining second battery core electricity of the battery at the second moment
Pressure value and the second current value.
Comparison unit 530, first current value and described second for obtaining the first acquisition unit 510 are obtained
The current differential taken between the second current value of the acquisition of unit 520 is contrasted with default current threshold.
Computing unit 540, if for drawing the current differential more than default current threshold according to comparison unit 530,
Then according to the current differential, the first battery core magnitude of voltage and the second battery core magnitude of voltage, the battery is calculated
Initial internal resistance value.
Used as a kind of embodiment, computing unit 540 includes computation subunit 541.
Computation subunit 541, for according to the difference of the first battery core magnitude of voltage and the second battery core magnitude of voltage divided by the electricity
Stream difference, is calculated the initial internal resistance value of the battery.
3rd acquiring unit 550, 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 carrying out at least one initial internal resistance value that the 3rd acquiring unit 550 is obtained
Filtering algorithm process, obtains the internal resistance estimated value of the battery.
Used as a kind of embodiment, processing unit 560 includes the first process subelement 561 and second processing subelement 562.
First process subelement 561, for obtain meet at least one initial internal resistance value pre-conditioned at least
One internal resistance value to be filtered.
Second processing subelement 562, described at least one for processing the acquisition of subelement 561 to described first are to be filtered
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 the conditions of this, above-mentioned is each
Unit can be stored in memory 110.Above each unit equally can be realized by hardware such as IC chip.
Device estimated by the internal resistance of cell provided in an embodiment of the present invention, and which realizes the technique effect of principle and generation and aforementioned the
Internal resistance of cell evaluation method embodiment in two embodiments is identical, is brief description, in place of device embodiment part does not refer to, can
With reference to corresponding contents in preceding method embodiment.
In several embodiments provided herein, it should be understood that disclosed apparatus and method, it is also possible to pass through
Other modes are realized.Device embodiment described above is only schematically, for example flow chart and block diagram in accompanying 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.At this point, each square frame in flow chart or block diagram can represent the one of module, program segment or a code
Part, a part the holding comprising one or more logic functions for realization regulation of the module, program segment or code
Row instruction.It should also be noted that in some are as the implementations that replaces, the function that marked in square frame can also be being different from
The order marked in accompanying drawing occurs.For example, two continuous square frames can essentially be executed substantially in parallel, and they have ready conditions
Under can also execute in the opposite order, this is depending on involved function.It is also noted that in block diagram and/or flow chart
Each square frame and block diagram and/or the square frame in flow chart combination, can use execute regulation function or action special
Hardware based system realizing, or can combine to realize with specialized hardware and computer instruction.
In addition, each functional module in each embodiment of the invention can integrate to form an independent portion
Divide, or modules individualism, it is also possible to which two or more modules are integrated to form an independent part.
If the function is realized using in the form of software function module and as under independent production marketing or use condition,
Can be stored in a computer read/write memory medium.Be based on such understanding, technical scheme substantially or
Person says that the part of the part or technical scheme contributed by prior art can be embodied in the form of software product,
The computer software product is stored in a storage medium, and using including some instructions so that computer equipment (can be with
It is personal computer, server, or network equipment etc.) execute all or part of step of each embodiment methods described of the invention
Suddenly.And aforesaid storage medium includes：USB flash disk, portable hard drive, read-only storage (ROM, Read-Only Memory), deposit at random
Access to memory (RAM, Random Access Memory), magnetic disc or CD etc. are various can be with the medium of store program codes.
It should be noted that herein, such as first and second or the like relational terms are used merely to an entity or behaviour
Make with another entity or operation make a distinction, and not necessarily require or imply these entities or operate between exist any this
Plant actual relation or order.And, term " including ", "comprising" or its any other variant are intended to nonexcludability
Include so that a series of process, method, article or equipment including key elements not only includes those key elements, but also
Including other key elements being not expressly set out, or also include intrinsic for this process, method, article or equipment wanting
Element.In the absence of more restrictions, the key element for being limited by sentence "including a ...", it is not excluded that including described wanting
Also there is other identical element in the process of element, method, article or equipment.
The preferred embodiments of the present invention are the foregoing is only, the present invention is not limited to, for the skill of this area
For art personnel, the present invention can have various modifications and variations.All within the spirit and principles in the present invention, made any repair
Change, equivalent, improvement etc., should be included within the scope of the present invention.It should be noted that：Similar label and letter exist
Similar terms is represented in figure below, therefore, once being defined in a certain Xiang Yi accompanying drawing, is then not required in subsequent accompanying drawing
Which is further defined and be explained.
The above, the only specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, any
Those familiar with the art the invention discloses technical scope in, change or replacement can be readily occurred in, should all be contained
Cover within protection scope of the present invention.Therefore, protection scope of the present invention described should be defined by scope of the claims.
It should be noted that herein, such as first and second or the like relational terms are used merely to a reality
Body or operation are made a distinction with another entity or operation, and are not necessarily required or implied these entities or deposit between operating
In any this actual relation or order.And, term " including ", "comprising" or its any other variant are intended to
Nonexcludability includes, so that a series of process, method, article or equipment including key elements not only includes that those will
Element, but also other key elements including being not expressly set out, or also include for this process, method, article or equipment
Intrinsic key element.In the absence of more restrictions, the key element for being limited by sentence "including a ...", it is not excluded that
Also there is other identical element in process, method, article or equipment including the key element.
Claims (10)
1. a kind of internal resistance of cell evaluation method, it is characterised in that be applied to battery management system, the battery management system is used for
Management battery pack, the battery pack include that N batteries, methods described include：
Obtain first battery core magnitude of voltage and first current value of the battery at the first moment；
According to default time delay, second battery core magnitude of voltage and second current value of the battery at the second moment is obtained；
By current differential and default current threshold between first current value and second current value of the battery
Contrasted；
If the current differential be more than default current threshold, according to the current differential, the first battery core magnitude of voltage with
And the second battery core magnitude of voltage, it is 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, obtain at least one initial interior
Resistance；
Algorithm process is filtered at least one initial internal resistance value, the internal resistance estimated value of the battery is obtained.
2. the method described in claim 1, it is characterised in that at least one initial internal resistance value is filtered at algorithm
Reason, obtains the internal resistance estimated value of the battery, including：
Obtain and at least one initial internal resistance value, meet the internal resistance value to be filtered of pre-conditioned at least one；
Algorithm process is filtered to described at least one internal resistance value to be filtered, the internal resistance estimated value of the battery is obtained.
3. according to the method described in claim 2, it is characterised in that described pre-conditioned including：
The initial internal resistance value is in the range of default resistance value.
4. method according to claim 1, it is characterised in that according to the current differential, the first battery core magnitude of voltage
And the second battery core magnitude of voltage, the initial internal resistance value of the battery is calculated, including：
According to the difference of the first battery core magnitude of voltage and the second battery core magnitude of voltage divided by the current differential, the battery is calculated
Initial internal resistance value.
5. the method according to any one of claim 1-4, it is characterised in that the filtering algorithm is first-order filtering or karr
Graceful filtering.
6. device estimated by a kind of internal resistance of cell, it is characterised in that be applied to battery management system, the battery management system is used for
Management battery pack, the battery pack include that N batteries, described device include：
First acquisition unit, for obtaining first battery core magnitude of voltage and first current value of the battery at the first moment；
Second acquisition unit, for according to default time delay, obtain the battery the second moment the second battery core magnitude of voltage with
And second current value；
Comparison unit, first current value for obtaining the first acquisition unit are obtained with the second acquisition unit
The second current value between current differential contrasted with default current threshold；
Computing unit, if for drawing the current differential more than default current threshold according to comparison unit, according to described
Current differential, the first battery core magnitude of voltage and the second battery core magnitude of voltage, are calculated the initial internal resistance of the battery
Value；
3rd acquiring unit, for according to first acquisition unit, second acquisition unit and comparison unit, obtaining the battery not
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 that the 3rd acquiring unit is obtained
Reason, obtains the internal resistance estimated value of the battery.
7. device according to claim 6, it is characterised in that the processing unit includes：
First processes subelement, and for obtaining, to meet pre-conditioned at least one at least one initial internal resistance value to be filtered
Ripple internal resistance value；
Second processing subelement, for carrying out to described at least one internal resistance value to be filtered that the described first process subelement is obtained
Filtering algorithm process, obtains the internal resistance estimated value of the battery.
8. device according to claim 7, it is characterised in that described pre-conditioned including：
The initial internal resistance value is in the range of default resistance value.
9. device according to claim 6, it is characterised in that the computing unit includes：
Computation subunit, for according to the difference of the first battery core magnitude of voltage and the second battery core magnitude of voltage divided by the current differential,
It is calculated the initial internal resistance value of the battery.
10. the device according to any one of claim 6-9, it is characterised in that the filtering algorithm is first-order filtering or card
Kalman Filtering.
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| CN115291130B (en) * | 2022-10-09 | 2023-01-20 | 江苏正力新能电池技术有限公司 | Battery pack parameter monitoring method and device, storage medium and electronic equipment |
| CN116718937A (en) * | 2023-06-30 | 2023-09-08 | 惠州亿纬锂能股份有限公司 | Internal resistance estimation method, battery management system, and computer-readable medium |
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