CN110231576A - A kind of SOE estimation method for mending electric-type active equalization based on battery - Google Patents
A kind of SOE estimation method for mending electric-type active equalization based on battery Download PDFInfo
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- CN110231576A CN110231576A CN201910516152.XA CN201910516152A CN110231576A CN 110231576 A CN110231576 A CN 110231576A CN 201910516152 A CN201910516152 A CN 201910516152A CN 110231576 A CN110231576 A CN 110231576A
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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]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/387—Determining ampere-hour charge capacity or SoC
- G01R31/388—Determining ampere-hour charge capacity or SoC involving voltage measurements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
Abstract
The present invention relates to technical field of battery management, disclose a kind of SOE estimation method that electric-type active equalization is mended based on battery.The SOE estimation method includes: to detect the real work electric current of single battery；According to the SOC value of real work current estimation single battery；According to the corresponding relationship of SOC value, the SOC value prestored and open-circuit voltage, the SOE value of single battery is estimated；Judge whether single battery is at equilibrium；In the case where judging that single battery is at equilibrium, the euqalizing current of single battery is obtained；According to euqalizing current, calculates single battery and carry out energy supplement that is balanced and generating；It is corrected according to SOE value of the energy supplement to single battery, the SOE value after obtaining and storing the correction of single battery.The SOE estimation method is corrected by SOE value of the euqalizing current to the single battery for mend electric-type active equalization, to promote the accuracy estimated battery pack SOE.
Description
Technical field
The present invention relates to technical field of battery management, and in particular, to a kind of SOE that electric-type active equalization is mended based on battery
Estimation method.
Background technique
It is influenced by energy crisis and environmental crisis, electric car is developed rapidly.It is right for electric car
The estimation of its course continuation mileage is always a technical problem, at present commonly use lithium battery charge state (State-of-Charge,
SOC) its course continuation mileage is judged, but SOC is not changed linearly with electric car continuation of the journey process, is put in battery pack
Electric latter stage, the variation of SOC will fast mistake can course continuation mileage, the erroneous judgement which results in user to electric car course continuation mileage.
Lithium battery energy state (State-of-Energy, SOE) and electric car course continuation mileage are closely related, are replaced with SOE
It is a kind of better way that SOC, which does course continuation mileage judgement,.However, battery pack, in actual moving process, balanced unlatching can be right
Battery pack power state has an impact, especially benefit electric-type active equalization.Battery mends electric-type active equalization and passes through external power supply pair
The lower single battery of electricity carries out mending electricity in battery pack, so that the energy of each single battery reaches unanimously in battery pack,
The charging of single battery will lead to the increase of battery pack power, and the euqalizing current for mending electric-type active equalization is often larger, thus
The energy state of entire battery pack is set to estimate to generate large error.Therefore, when estimating battery SOE, consider that battery is equal
The influence factor of weighing apparatus can just obtain more accurate estimated result.
Summary of the invention
The object of the present invention is to provide a kind of SOE estimation method that electric-type active equalization is mended based on battery, the estimation sides SOE
Method considers battery and mends influence of the energy of electric-type active equalization supplement to battery SOE value, improves the accuracy of SOE estimation.
To achieve the goals above, embodiments of the present invention provide a kind of SOE that electric-type active equalization is mended based on battery
Estimation method, the SOE estimation method is the following steps are included: detect the real work electric current of single battery；According to real work electricity
The SOC value of stream estimation single battery；According to the corresponding relationship of SOC value, the SOC value prestored and open-circuit voltage, single battery is estimated
SOE value；Judge whether single battery is at equilibrium；In the case where judging that single battery is at equilibrium, obtain
The euqalizing current of single battery；According to euqalizing current, calculates single battery and carry out energy supplement that is balanced and generating；According to energy
Supplement is corrected the SOE value of single battery, the SOE value after obtaining and storing the correction of single battery.
Preferably, the SOE estimation method further include: in the case where judging that single battery is not in equilibrium state, storage
The SOE value of single battery.
Preferably, SOE estimation method further include: according to the SOE after the SOE value of the single battery of storage or correction
Value, obtains the SOE value of battery pack.
Preferably, according to the corresponding relationship of SOC value, the SOC value prestored and open-circuit voltage, estimate the SOE value of single battery,
It specifically includes: according to the corresponding relationship of SOC value, the SOC value prestored and open-circuit voltage, obtaining the open-circuit voltage of single battery；Root
According to open-circuit voltage, using the SOE value of current integration method estimation single battery.
Preferably, the corresponding relationship of the SOC value and open-circuit voltage that prestore is the one-to-one relationship of SOC value and open-circuit voltage
Table.
Preferably, the SOC value in mapping table is multiple equally spaced numerical value between 0%~100%.
Preferably, it according to the corresponding relationship of SOC value, the SOC value and open-circuit voltage that prestore after SOC value or correction, obtains
Single battery open-circuit voltage include: in mapping table comprising SOC value or correction after SOC value in the case where, look into
Table obtains the open-circuit voltage of single battery corresponding with the SOC value after SOC value or correction；Do not include in mapping table
SOC value perhaps correct after SOC value in the case where it is adjacent from determining SOC value with SOC value or after correcting in mapping table
Two refer to SOC value SOC1And SOC2, wherein SOC value or correction after SOC value be located at two refer to SOE value SOC1With
SOC2Between；The open-circuit voltage of single battery is estimated according to formula (1):
Wherein, VocOpen-circuit voltage for the single battery estimated, SOC are that estimation obtains or estimate and correct to obtain
Single battery SOC value, SOC1And SOC2SOC value, V are referred to for two adjacent with SOC value in mapping tableoc1And Voc2
Respectively in mapping table with SOC1And SOC2Corresponding open-circuit voltage.
Preferably, using the SOC value of current integration method estimation single battery.
Through the above technical solutions, by euqalizing current to carry out mend electric-type active equalization single battery SOE value into
Row correction, to promote the accuracy estimated battery pack SOE.
Other features and advantages of the present invention will the following detailed description will be given in the detailed implementation section.
Detailed description of the invention
The drawings are intended to provide a further understanding of the invention, and constitutes part of specification, with following tool
Body embodiment is used to explain the present invention together, but is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the flow chart based on battery balanced SOE estimation method according to an embodiment of the present invention；
Fig. 2 is the flow chart based on battery balanced SOE estimation method according to an embodiment of the present invention；
Fig. 3 shows the passive balanced circuit diagram of battery of one embodiment of the present invention；
Fig. 4 is the flow chart based on the passive balanced SOE estimation method of battery according to an embodiment of the present invention；
Fig. 5 is the flow chart based on the passive balanced SOE estimation method of battery according to an embodiment of the present invention；
The battery that Fig. 6 shows one embodiment of the present invention mends the circuit diagram of electric-type active equalization；
Fig. 7 is the stream of the SOE estimation method that electric-type active equalization is mended based on battery according to an embodiment of the present invention
Cheng Tu；
Fig. 8 is the stream of the SOE estimation method that electric-type active equalization is mended based on battery according to an embodiment of the present invention
Cheng Tu；
Fig. 9 shows the circuit diagram of the energy content of battery moving type active equalization of one embodiment of the present invention；
Figure 10 is the SOE estimation method based on energy content of battery moving type active equalization according to an embodiment of the present invention
Flow chart；
Figure 11 is the schematic block diagram of SOE estimation device according to an embodiment of the present invention.
Specific embodiment
Below in conjunction with attached drawing, detailed description of the preferred embodiments.It should be understood that this place is retouched
The specific embodiment stated is merely to illustrate and explain the present invention, and is not intended to restrict the invention.
Fig. 1 is the flow chart based on battery balanced SOE estimation method according to an embodiment of the present invention.Such as Fig. 1
It is shown, in one embodiment of the present invention, provide a kind of based on battery balanced SOE estimation method, the SOE estimation method
May include:
Following operation is executed to each single battery in battery pack:
In step s101, estimate the SOC value of single battery；
In step s 102, judge whether the single battery is at equilibrium；
In step s 103, in the case where judging that the single battery is at equilibrium, the equal of the single battery is obtained
Weigh electric current；
In step S104, according to the euqalizing current of the single battery of acquisition, school is carried out to the SOC value of the single battery
Just, with the SOC value after being corrected；
In step s105, according to the corresponding relationship of SOC value, the SOC value and battery open circuit voltage that prestore after correction, estimate
Count the SOE value of single battery.
In one embodiment of the present invention, SOE estimation method can also include；
In step s 106, in the case where judging that single battery is not in equilibrium state, according to SOC value, the SOC prestored
The corresponding relationship of value and open-circuit voltage, estimates the SOE value of single battery.
The single battery for forming battery pack e.g. can be with lithium battery.Such as battery pack can be estimated using current integration method
In each single battery SOC value, can specifically be indicated using formula (1):
Wherein, SOCxIt (t) is the instantaneous state-of-charge of the xth section single battery in t moment battery pack；
SOCxIt (0) is the initial state-of-charge of the xth section single battery in battery pack；η is that charge-discharge magnification holds battery
The influence of amount, setting up is 1；ixIt (t) is the real work electric current of the xth section single battery in t moment battery pack, C0For monomer electricity
The rated capacity in pond, for example, can default each single battery rated capacity it is identical.
In one embodiment of the present invention, such as can be sentenced by the euqalizing current of each single battery of real-time detection
Whether disconnected single battery is at equilibrium.If the euqalizing current of certain section single battery is zero, illustrate the equal of the single battery
Weighing apparatus does not start；If the euqalizing current of certain section single battery is nonzero value, illustrate that the balanced of the single battery is opened.Each monomer
The real work electric current and euqalizing current of battery can for example be detected by current sensor, can also be detected by BMS.
In the case where judging that certain section single battery is at equilibrium, monomer electricity can be corrected using formula (2)
The SOC value in pond:
Wherein, SOC 'xIt (t) is the instantaneous state-of-charge after the correction of the xth section single battery in t moment battery pack, iBx
It (t) is the euqalizing current of the xth section single battery in t moment battery pack.
Before battery pack begins to use, the battery open circuit voltage under different SOC values is detected, and is stored in such as battery management
In system (Battery Management System, BMS).In one embodiment of the present invention, the SOC value and electricity prestored
The corresponding relationship of pond open-circuit voltage for example can be the one-to-one relationship table of SOC value as shown in Table 1 and battery open circuit voltage.
The mapping table of table 1 SOC value and battery open circuit voltage
| SOC% | OCV | SOC% | OCV | SOC% | OCV | SOC% | OCV | SOC% | OCV |
| 0 | 2698.4 | 20 | 3276.3 | 40 | 3309.8 | 60 | 3318.5 | 80 | 3344.5 |
| 4 | 3118.8 | 24 | 3292.4 | 44 | 3311 | 64 | 3332.1 | 84 | 3345.7 |
| 8 | 3221.7 | 28 | 3302.3 | 48 | 3312.3 | 68 | 3344.5 | 88 | 3345.7 |
| 12 | 3229.2 | 32 | 3308.5 | 52 | 3312.3 | 72 | 3344.5 | 92 | 3344.5 |
| 16 | 3251.5 | 36 | 3309.8 | 56 | 3314.7 | 76 | 3344.5 | 96 | 3347 |
| 100 | 3351.9 |
SOC value in mapping table for example can be multiple equally spaced numerical value between 0%~100%.In table 1
What is shown is the corresponding battery open circuit voltage of SOC value between 0%~100%, being divided into 4%.
In one embodiment of the present invention, according to the SOC value after SOC value or correction, the SOC value prestored and electricity of opening a way
The corresponding relationship of pressure is estimated the SOE value of single battery, be can specifically include:
According to the corresponding relationship of SOC value, the SOC value and open-circuit voltage that prestore after SOC value or correction, monomer electricity is obtained
The open-circuit voltage in pond；
According to open-circuit voltage, using the SOE value of current integration method estimation single battery.
And the mapping table based on SOC value and battery open circuit voltage, it is obtained according to the SOC value after SOC value or correction
The open-circuit voltage of single battery can specifically include:
Acquisition and the SOC value of tabling look-up in the case where SOC value after perhaps correct in mapping table comprising SOC value or
The open-circuit voltage of the corresponding single battery of SOC value after correction；
In the case where in mapping table not comprising the SOC value after SOC value or correction,
The two reference SOC value SOCs adjacent with the SOC value after SOC value or correction from determination in mapping table1With
SOC2, wherein SOC value or correction after SOC value be located at two refer to SOE value SOC1And SOC2Between；
The open-circuit voltage of single battery is estimated according to formula (3):
Wherein, VocOpen-circuit voltage for the single battery estimated, SOC are that estimation obtains or estimate and correct to obtain
Single battery SOC value, SOC1And SOC2SOC value, V are referred to for two adjacent with SOC value in mapping tableoc1And Voc2
Respectively in mapping table with SOC1And SOC2Corresponding open-circuit voltage.
According to open-circuit voltage, use the specific formula for calculation of the SOE value of current integration method estimation single battery for example can be with
It is indicated using formula (4):
Wherein, SOExIt (t) is the energy state value of the xth section single battery in t moment battery pack, SOEx(0) for it is initial when
Carve the energy state value of the xth section single battery in battery pack, Voc-xIt (t) is the SOC value SOC with t moment xth batteriesx(t)
Or the SOC value SOC ' after correctionx(t) corresponding open-circuit voltage, Voc(0) open-circuit voltage when electricity full for single battery, such as
The full opens voltage that each single battery can be defaulted is identical.
Fig. 2 is the flow chart based on battery balanced SOE estimation method according to an embodiment of the present invention.Such as Fig. 2
It is shown, in one embodiment of the present invention, provide a kind of based on battery balanced SOE estimation method, compared to Figure 1, Fig. 2
Shown in SOE estimation method can also include:
In step S207, according to the SOE value of single battery, the SOE value of battery pack is obtained.
Specifically, it is assumed that battery pack is connected in series by each single battery, then the SOE value of battery pack is equal to each monomer electricity
The SOE value of the sum of the SOE value in pond, battery pack can be indicated using formula (5):
Wherein, SOE (t) is total energy state value of t moment battery pack, and n is concatenated single battery in battery pack
Quantity.
In another embodiment of the present invention, for single battery at equilibrium, the step of estimating SOE, can also
To be first to obtain the open circuit of single battery according to the corresponding relationship of the SOC value of single battery, the SOC value and open-circuit voltage that prestore
Voltage estimates the SOE value of single battery according to open-circuit voltage, then carries out further according to SOE value of the euqalizing current to single battery
Correction.
Battery balanced mode is divided into passive balanced and active equalization again and also distinguishes in multiple embodiments of the invention
It provides based on passive battery SOE estimation method and device balanced, that mend electric-type active equalization and energy moving type active equalization.
Fig. 3 shows the passive balanced circuit diagram of battery of one embodiment of the present invention.As shown in figure 3, battery
The both ends of each unit battery in group are parallel with a power resistor R respectively, by by the both ends of balanced single battery simultaneously
Join power resistor electric discharge, consumes the energy of the higher single battery of electricity so that the energy of each single battery reaches in battery pack
To consistent.In Fig. 3, label B1, B2 ..., Bn indicate composition battery pack single battery；K1, K2 ..., Kn indicate controllable
Switch；U1, U2 ..., Un be euqalizing current sensor, be respectively used to detection single battery B1, B2 ..., Bn equilibrium electricity
Stream.
Fig. 4 is the flow chart based on the passive balanced SOE estimation method of battery according to an embodiment of the present invention.Such as
Shown in Fig. 4, in one embodiment of the present invention, provide a kind of based on the passive balanced SOE estimation method of battery, the SOE
Estimation method may include:
Following operation is executed to each single battery for including in battery pack:
In step S301, the real work electric current of single battery is detected；
In step s 302, according to the SOC value of real work current estimation single battery；
In step S303, according to the corresponding relationship of SOC value, the SOC value prestored and open-circuit voltage, single battery is estimated
SOE value；
In step s 304, judge whether single battery is at equilibrium；
In step S305, in the case where judging that single battery is at equilibrium, the equilibrium electricity of single battery is obtained
Stream；
In step S306, according to euqalizing current, calculates single battery and carry out energy consumption that is balanced and generating；
In step S307, it is corrected according to SOE value of the energy consumption to single battery, obtains and store single battery
Correction after SOE value.
The energy consumption of single battery can also for example be indicated using energy state percentage.In an implementation of the invention
In mode, the energy consumption of single battery is calculated using integration method, circular can be indicated using formula (6):
Wherein, Δ SOEx(t) the passive balanced energy consumption generated is carried out for xth section single battery in t moment battery pack,
iBxIt (t) is the euqalizing current of the xth section single battery in t moment battery pack, Voc-xIt (t) is the SOC with t moment xth batteries
Value SOCx(t) corresponding open-circuit voltage.
For the single battery in passive equilibrium state, its energy state of t moment is to estimate in step S303
SOE value out subtracts its energy consumption generated because carrying out passive equilibrium.It is not in the single battery of equilibrium state, without energy
Amount consumption is the SOE value estimated in step S303 in the energy of t moment.
In one embodiment of the present invention, which can also include:
In step S308, in the case where judging that single battery is not in equilibrium state, single battery is directly stored
SOE value.
Fig. 5 is the flow chart based on the passive balanced SOE estimation method of battery according to an embodiment of the present invention.Such as
Shown in Fig. 5, in one embodiment of the present invention, a kind of SOE estimation method based on the passive equilibrium of battery is provided, with Fig. 4
It compares, which can also include:
In step S409, according to the SOE value after the SOE value of the single battery of storage or correction, battery pack is obtained
SOE value.
The SOE value of series-connected cell group can be indicated using formula (7):
Wherein, SOE (t) is total energy state value of t moment battery pack, and m1 is to carry out from initial time to t moment
The quantity of the single battery of active equalization.
The battery that Fig. 6 shows one embodiment of the present invention mends the circuit diagram of electric-type active equalization.Such as Fig. 6 institute
Showing, battery mends electric-type active equalization and carries out mending electricity to the lower single battery of electricity in battery pack by external power supply, so that
The energy of each single battery reaches consistent in battery pack.DCDC is marked to indicate isolated DC-direct current transducer, U table in Fig. 6
Show euqalizing current sensor, for detecting euqalizing current, K1, K2, K3 are controllable switch, B1, B2 ..., Bn indicate composition
The single battery of battery pack.
Fig. 7 is the stream of the SOE estimation method that electric-type active equalization is mended based on battery according to an embodiment of the present invention
Cheng Tu.As shown in fig. 7, in one embodiment of the present invention, provides a kind of SOE that electric-type active equalization is mended based on battery and estimate
Meter method, the SOE estimation method may include:
Following operation is executed to each single battery for including in battery pack:
In step S501, the real work electric current of single battery is detected；
In step S502, according to the SOC value of real work current estimation single battery；
In step S503, according to the corresponding relationship of SOC value, the SOC value prestored and open-circuit voltage, single battery is estimated
SOE value；
In step S504, judge whether single battery is at equilibrium；
In step S505, in the case where judging that single battery is at equilibrium, the equilibrium electricity of single battery is obtained
Stream；
In step S506, according to euqalizing current, calculates single battery and carry out energy supplement that is balanced and generating；
In step s 507, it is corrected according to SOE value of the energy supplement to single battery, obtains and store single battery
Correction after SOE value.
The energy supplement of single battery can also for example be indicated using energy state percentage.In an implementation of the invention
In mode, the energy supplement of single battery is calculated using integration method, circular can be indicated using formula (8):
Wherein, Δ SOE 'x(t) mend for xth section single battery in t moment battery pack the energy of electric-type active equalization generation
Amount supplement, iBxIt (t) is the euqalizing current of the xth section single battery in t moment battery pack, Voc-xIt (t) is to economize on electricity with t moment xth
The SOC value SOC in pondx(t) corresponding open-circuit voltage.
For in the single battery for mending electric-type active equalization state, its energy state of t moment is in step S503
In the energy supplement that is generated due to carrying out and mending electric-type active equalization plus its of the SOE value that estimates.It is not in the list of equilibrium state
Body battery is the SOE value estimated in step S503 in the energy of t moment without energy consumption.
In one embodiment of the present invention, which can also include:
In step S508, in the case where judging that single battery is not in equilibrium state, single battery is directly stored
SOE value.
Fig. 8 is the stream of the SOE estimation method that electric-type active equalization is mended based on battery according to an embodiment of the present invention
Cheng Tu.As shown in figure 8, in one embodiment of the present invention, provides a kind of SOE that electric-type active equalization is mended based on battery and estimate
Meter method, compared with Fig. 7, which can also include:
In step S609, according to the SOE value after the SOE value of the single battery of storage or correction, battery pack is obtained
SOE value.
The SOE value of series-connected cell group can be indicated using formula (9):
Wherein, SOE (t) is total energy state value of t moment battery pack, and m2 is to carry out from initial time to t moment
Mend the quantity of the single battery of electric-type active equalization.
Fig. 9 shows the circuit diagram of the energy content of battery moving type active equalization of one embodiment of the present invention.Such as Fig. 9
Shown, it is lower by equalizing circuit to be transferred to electricity in battery pack by the higher single battery of electricity for portion of energy in battery pack
Single battery, so that the energy of each single battery reaches consistent in battery pack.In Fig. 9, B1 and B2 are single battery, U1
It is euqalizing current sensor with U2, C1 is capacitor, and S1 and S2 are controllable switch.
Figure 10 is the SOE estimation method based on energy content of battery moving type active equalization according to an embodiment of the present invention
Flow chart.As shown in Figure 10, in one embodiment of the present invention, it provides a kind of based on energy content of battery formula active equalization
SOE estimation method, the SOE estimation method may include:
In step s 701, the real work electric current of each single battery in battery pack is detected.
In step S702, according to the SOC value of each single battery of real work current estimation.
In step S703, according to the corresponding relationship of SOC value, the SOC value prestored and open-circuit voltage, each monomer electricity is estimated
The SOE value in pond.
In one embodiment of the present invention, according to the SOC value of a certain single battery, the SOC value prestored and battery open circuit
The corresponding relationship of voltage is estimated the SOE value of the single battery, be can specifically include:
According to the corresponding relationship of the SOC value of the single battery, the SOC value prestored and open-circuit voltage, the single battery is obtained
Open-circuit voltage；
According to the open-circuit voltage of the single battery, the SOE value of each single battery is estimated using current integration method.
In step S704, judge to move in battery pack with the presence or absence of generation energy between two single batteries, that is,
Judge whether battery pack opens equilibrium.
There is no in the case that generation energy is moved between any two single battery in judging battery pack, it is directly entered
Step S709 calculates the SOE of battery pack according to the SOE of each single battery.
In step S705, in judging battery pack there are between two single batteries occur energy move in the case where,
Balancing battery and the euqalizing current by balancing battery are obtained respectively, wherein by the monomer that generation energy produces in two single batteries
Battery is defined as balancing battery, the single battery that the energy that balancing battery produces is received in two single batteries is defined as equal
Weigh battery.
Such as whether the value of the euqalizing current for each single battery that can be detected according to euqalizing current sensor is zero
It is moved to judge whether battery pack opens generation energy between balanced and which two single battery.Such as it can be according to electric current
Flow direction which single battery is balancing battery among two single batteries moving of energy judging to occur, which single battery
For by balancing battery.
In step S706, according to the euqalizing current of balancing battery, calculates balancing battery and carry out energy that is balanced and generating
Transfer, that is, the energy that balancing battery produces.The energy transfer can for example indicate with energy state percentage, such as can
To be calculated using formula (10):
Wherein, Δ SOE "x,1(t) energy transfer that is balanced and generating, V are carried out for t moment balancing batteryoc-x(t) be t when
Carve the open-circuit voltage of xth section single battery in battery pack, iBxIt (t) is the equilibrium electricity of xth section single battery in t moment battery pack
Stream.
In step S707, according to the euqalizing current of balancing battery and by the euqalizing current of balancing battery, it is equal to calculate battery
Weigh efficiency.
In one embodiment of the present invention, such as battery balanced efficiency can be calculated using formula (11):
λ=iB2*Voc2/iB1*Voc1Formula (11)
Wherein, λ is battery balanced efficiency, iB1And iB2Respectively balancing battery and the euqalizing current by balancing battery；Voc1
And Voc2Respectively balancing battery and the open-circuit voltage by balancing battery.
In step S708, it is corrected according to SOE value of the energy transfer to balancing battery, according to energy transfer and battery
Equalization efficiency is corrected to by the SOE value of balancing battery.The SOE value of balancing battery is that the SOE value that calculates is (no in step S703
Consider balanced SOE value) subtract energy transfer Δ SOE "x,1(t)；And energy (the hereinafter referred to as energy received by balancing battery
Receive) it can be indicated using formula (12):
ΔSOE″x,2(t)=λ * Δ SOE "x,1(t) formula (12)
Wherein, Δ SOE "x,2(t) energy to be received by balancing battery.Due to the loss of equalizing circuit, energy acceptance
Value is less than energy transfer value.It is then the SOE value (not considering balanced SOE value) calculated in step S703 by the SOE of balancing battery
In addition energy acceptance Δ SOE "x,2(t)。
In step S709, according to the SOE value after the SOE value of each single battery or correction, the SOE of battery pack is obtained
Value.The SOE value of battery pack can for example be indicated using formula (13):
Wherein, SOE (t) is total energy state value of t moment battery pack, and m3 is to carry out from initial time to t moment
The quantity of the balancing battery of energy moving type active equalization.Due to only one group of single battery (equilibrium simultaneously in battery pack
Battery and one it is balanced) between energy transfer occurs, therefore it is actively equal to carry out from initial time to t moment energy moving type
Weighing apparatus is also m3 by the quantity of balancing battery.
In a kind of SOE estimation method of any of the above, if opening without equilibrium, the SOE value of battery pack can be using public affairs
Formula (14) indicates:
Figure 11 is the schematic block diagram of SOE estimation device according to an embodiment of the present invention.The SOE estimation device can be with
For executing any one in above embodiment based on battery balanced SOE estimation method.Specifically, such as Figure 11 institute
Show, includes processor 10 based on battery balanced SOE estimation device.
In an embodiment of the invention, processor 10 may be configured to:
Estimate the SOC value of single battery；
Judge whether single battery is at equilibrium；
In the case where judging that single battery is at equilibrium, the euqalizing current of single battery is obtained；
According to euqalizing current, SOC value is corrected, with the SOC value after being corrected；
According to the corresponding relationship of SOC value, the SOC value and battery open circuit voltage that prestore after correction, single battery is estimated
SOE value.
In one embodiment of the present invention, processor can be configured to: judge that single battery is not in equilibrium
In the case where state, according to the corresponding relationship of SOC value, the SOC value prestored and battery open circuit voltage, the SOE of single battery is estimated
Value；And the SOE value according to single battery, obtain the SOE value of battery pack.
SOE estimation device shown in Figure 11 can be also used for execute above embodiment in any one be based on battery quilt
Move balanced SOE estimation method.In another embodiment of the present invention, processor 10 may be configured to:
Detect the real work electric current of single battery；
According to the SOC value of real work current estimation single battery；
According to the corresponding relationship of SOC value, the SOC value prestored and open-circuit voltage, the SOE value of single battery is estimated；
Judge whether single battery is at equilibrium；
In the case where judging that single battery is at equilibrium, the euqalizing current of single battery is obtained；
According to euqalizing current, calculates single battery and carry out energy consumption that is balanced and generating；
It is corrected according to SOE value of the energy consumption to single battery, the SOE after obtaining and storing the correction of single battery
Value.
SOE estimation device shown in Figure 11 can be also used for execute above embodiment in any one be based on battery benefit
The SOE estimation method of electric-type active equalization.In a further embodiment of the invention, processor 10 be may be configured to:
Detect the real work electric current of single battery；
According to the SOC value of real work current estimation single battery；
According to the corresponding relationship of SOC value, the SOC value prestored and open-circuit voltage, the SOE value of single battery is estimated；
Judge whether single battery is at equilibrium；
In the case where judging that single battery is at equilibrium, the euqalizing current of single battery is obtained；
According to euqalizing current, calculates single battery and carry out energy supplement that is balanced and generating；
It is corrected according to SOE value of the energy supplement to single battery, the SOE after obtaining and storing the correction of single battery
Value.
In one embodiment of the present invention, processor can be additionally configured to: judge that single battery is not in equilibrium
In the case where state, the SOE value of single battery is stored；And it according to the SOE value after the SOE value or correction of single battery, obtains
Obtain the SOE value of battery pack.
In an embodiment of the invention, which can also include balanced with the connection of processor 10
Current sensor 20, for detecting the euqalizing current of single battery；The operating current sensor 30 connecting with processor 10, is used for
Detect the real work electric current of single battery.
In addition, the SOE estimation device can also include the memory 40 connecting with processor 10, it is configured to store SOC
The corresponding relationship of value and battery open circuit voltage.
SOE estimation device shown in Figure 11 can be also used for execute above embodiment in any one be based on battery energy
Measure the SOE estimation method of moving type active equalization.In a further embodiment of the invention, processor 10 be may be configured to:
Detect the real work electric current of each single battery in battery pack；
According to the SOC value of each single battery of real work current estimation；
According to the corresponding relationship of SOC value, the SOC value prestored and open-circuit voltage, the SOE value of each single battery is estimated；
Judge to move in battery pack with the presence or absence of generation energy between two single batteries；
There are in the case that generation energy is moved between two single batteries in judging battery pack, balanced electricity is obtained respectively
Pond and euqalizing current by balancing battery, wherein being defined as equilibrium for the single battery that energy produces is generated in two single batteries
The single battery that the energy that balancing battery produces is received in two single batteries is defined as by balancing battery by battery；
According to the euqalizing current of balancing battery, calculates balancing battery and carry out energy transfer that is balanced and generating；
According to the euqalizing current of balancing battery and by the euqalizing current of balancing battery, battery balanced efficiency is calculated；
It is corrected according to SOE value of the energy transfer to balancing battery, according to energy transfer and battery balanced efficiency to quilt
The SOE value of balancing battery is corrected；
According to the SOE value after the SOE value of each single battery or correction, the SOE value of battery pack is obtained.
In alternatively or additionally embodiment of the invention, which can also include the display connecting with processor 10
50, it is display configured to the SOE value of battery pack.
In an embodiment of the invention, which can be BMS.
In an embodiment of the invention, a kind of computer readable storage medium is provided, on the storage medium
It is stored with instruction, which makes the processor execute any one of the above SOE estimation method when being executed by processor.
By above embodiment, the influence of balanced factor is considered during estimating battery SOE value, is opened in battery
In the case where opening equilibrium, or SOC value is first corrected according to euqalizing current and obtains SOE value further according to the SOC value after correction, or directly first
SOE value is obtained further according to euqalizing current correction SOE value with SOC value is not corrected, improves the accurate of the SOE value of the battery pack of acquisition
Degree.
It is described the prefered embodiments of the present invention in detail above in conjunction with attached drawing, still, the present invention is not limited to above-mentioned realities
The detail in mode is applied, within the scope of the technical concept of the present invention, a variety of letters can be carried out to technical solution of the present invention
Monotropic type, these simple variants all belong to the scope of protection of the present invention.It is further to note that in above-mentioned specific embodiment
Described in each particular technique feature can be combined in any appropriate way in the case of no contradiction, be
Avoid unnecessary repetition, the invention will not be further described in various possible combinations.
In addition, various embodiments of the present invention can be combined randomly, as long as it is without prejudice to originally
The thought of invention, it should also be regarded as the disclosure of the present invention.
Claims (8)
1. a kind of SOE estimation method for mending electric-type active equalization based on battery, which comprises the following steps:
Detect the real work electric current of single battery；
According to the SOC value of single battery described in the real work current estimation；
According to the corresponding relationship of the SOC value, the SOC value prestored and open-circuit voltage, the SOE value of the single battery is estimated；
Judge whether the single battery is at equilibrium；
In the case where judging that the single battery is at equilibrium, the euqalizing current of the single battery is obtained；
According to the euqalizing current, calculates the single battery and carry out energy supplement that is balanced and generating；
It is corrected according to SOE value of the energy supplement to the single battery, obtains and store the school of the single battery
SOE value after just.
2. SOE estimation method according to claim 1, which is characterized in that the SOE estimation method further include:
In the case where judging that the single battery is not in equilibrium state, the SOE value of the single battery is stored.
3. SOE estimation method according to claim 2, which is characterized in that the SOE estimation method further include:
According to the SOE value after the SOE value of the single battery of storage or correction, the SOE value of battery pack is obtained.
4. SOE estimation method according to claim 1, which is characterized in that according to the SOC value, the SOC value prestored and electricity
The corresponding relationship of pond open-circuit voltage is estimated the SOE value of the single battery, is specifically included:
According to the corresponding relationship of the SOC value, the SOC value prestored and open-circuit voltage, the open-circuit voltage of the single battery is obtained；
According to the open-circuit voltage, the SOE value of the single battery is estimated using current integration method.
5. SOE estimation method according to claim 1, which is characterized in that pair of the SOC value and battery open circuit voltage that prestore
It should be related to the one-to-one relationship table for SOC value and open-circuit voltage.
6. SOE estimation method according to claim 5, which is characterized in that SOC value in mapping table is 0%~
Multiple equally spaced numerical value between 100%.
7. SOE estimation method according to claim 6, which is characterized in that after the SOC value or the correction
The corresponding relationship of SOC value, the SOC value prestored and open-circuit voltage, the open-circuit voltage for obtaining the single battery include:
In the case where in the mapping table comprising the SOC value after the SOC value or the correction, table look-up acquisition and institute
The open-circuit voltage of the corresponding single battery of SOC value after stating SOC value or the correction；
In the case where in the mapping table not comprising the SOC value after the SOC value or the correction,
SOC value is referred to from determination is adjacent with the SOC value after the SOC value or the correction in the mapping table two
SOC1And SOC2, wherein the SOC value after the SOC value or the correction refers to SOE value SOC positioned at described two1And SOC2It
Between；
The open-circuit voltage of the single battery is estimated according to formula (1):
Wherein, VocOpen-circuit voltage for the single battery estimated, SOC are list that is that estimation obtains or estimating and correct
The SOC value of body battery, SOC1And SOC2SOC value, V are referred to for two adjacent with SOC value in mapping tableoc1And Voc2Respectively
For in mapping table with SOC1And SOC2Corresponding open-circuit voltage.
8. SOE estimation method according to claim 1, which is characterized in that estimate the monomer electricity using current integration method
The SOC value in pond.
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