CN110231572A - A kind of SOC estimation device based on active equalization of battery - Google Patents
A kind of SOC estimation device based on active equalization of battery Download PDFInfo
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- CN110231572A CN110231572A CN201910515777.4A CN201910515777A CN110231572A CN 110231572 A CN110231572 A CN 110231572A CN 201910515777 A CN201910515777 A CN 201910515777A CN 110231572 A CN110231572 A CN 110231572A
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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
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Abstract
The present invention relates to technical field of battery management, disclose a kind of SOC estimation device based on active equalization of battery.The SOC estimation device includes processor, and processor is configured as: obtaining the SOC value of each single battery；It determines the SOC value of battery pack and intends by balancing battery；In the case where quasi- balanced by balancing battery unlatching, quasi- it will be defined as by balancing battery by balancing battery, and obtain by the euqalizing current of balancing battery；It is corrected according to euqalizing current to by the SOC value of balancing battery；In the case where remaining as the minimum single battery of SOC value in battery pack by balancing battery, the SOC value of battery pack is updated with the SOC value after the correction by balancing battery.SOC value of the SOC value of the SOC estimation device each battery of real-time estimation in battery pack use process to obtain battery pack, and in the case where battery opens balanced, the SOC value of balancing battery is corrected by euqalizing current, to update the SOC value of battery pack, the accuracy to battery pack SOC estimation is improved.
Description
Technical field
The present invention relates to technical field of battery management, and in particular, to a kind of SOC estimation based on active equalization of battery
Device.
Background technique
In recent years, large-capacity battery pack electric car, in terms of using more and more extensive.Large-capacity battery pack
When in use, in series or in parallel often through single battery progress, to increase cell voltage and capacity, reaching actual use is needed
It asks.Due to single battery in the manufacturing and use process by the nuance of the factors such as environment temperature, cause with circulation
The increase of number, the inconsistency in battery pack can be gradually increased, and accelerate cell decay, therefore need in battery pack use process
Equilibrium is carried out to it.
However, the euqalizing current generated during battery balanced can the SOC state estimation to battery pack generate larger shadow
It rings, especially active equalization.Active equalization is to carry out mending electricity by the single battery to electricity minimum (SOC value is minimum) to mention
Consistency of battery pack is risen, and the euqalizing current generated during active equalization is larger, and it is past in the estimation of battery pack SOC
Toward the SOC value using the minimum single battery of electricity as the SOC value of entire battery pack, therefore active equalization will lead to SOC
The further increasing of evaluated error.
Summary of the invention
The object of the present invention is to provide a kind of SOC estimation device based on active equalization of battery, the SOC estimation device are examined
Consider the battery balanced influence to SOC value of battery, improves the accuracy of SOC estimation.
To achieve the goals above, embodiments of the present invention provide a kind of SOC estimation dress based on active equalization of battery
It sets, which includes processor, and processor is configured as: each single battery in battery pack under acquisition current state
SOC value；Using the smallest SOC value of numerical value in the SOC value of each single battery as the SOC value of battery pack, and by corresponding list
Body battery is determined as quasi- by balancing battery；Whether judgement is quasi- opens equilibrium by balancing battery；Intend being opened by balancing battery in judgement
In the case where equilibrium, it is defined as quasi- by balancing battery by balancing battery, and obtain by the euqalizing current of balancing battery；According to equal
Weighing apparatus electric current is corrected to by the SOC value of balancing battery, to obtain by the SOC value after the correction of balancing battery；After correction
SOC value, judge whether the single battery that SOC value is minimum in battery pack is remained as by balancing battery；Judging by balancing battery
In the case where remaining as the minimum single battery of SOC value in battery pack, battery is updated with the SOC value after the correction by balancing battery
The SOC value of group；Store and export the SOC value of battery pack.
Preferably, which is also configured to judging it has no longer been that SOC value is minimum in battery pack by balancing battery
Single battery in the case where, battery pack is updated with the smallest SOC value of numerical value in the SOC value of single battery each under current state
SOC value.
Preferably, whether which is also configured to judge battery pack still in use state；Judging battery pack still
In the case where use state, the SOC value of each single battery under current state is estimated, again to redefine battery pack
SOC value and quasi- by balancing battery, and again with each monomer under the SOC value or current state after the correction by balancing battery
The smallest SOC value of numerical value updates the SOC value of battery pack in the SOC value of battery.
Preferably, the SOC value for obtaining each single battery in battery pack under current state includes: to read the battery pack last time
The SOC value of each single battery saved before lower electricity；Or estimate the SOC value of each single battery under current state.
Preferably, which is also configured to the feelings in the SOC value for obtaining each single battery by reading manner
Following operation is executed under condition: judging whether battery pack meets standing calibration condition；Calibration condition is stood judging that battery pack meets
In the case where, standing calibration is carried out to the SOC value saved before electricity under the battery pack last time of reading.
Preferably, the SOC value of each single battery stand calibrating and be specifically included: obtaining opening for each single battery
Road voltage；According to open-circuit voltage, the corresponding relationship of the SOC value prestored and battery open circuit voltage, to the SOC value of each single battery
Carry out standing calibration.
Preferably, SOE estimation device further include: euqalizing current sensor connected to the processor, for detecting monomer electricity
The euqalizing current in pond；Operating current sensor connected to the processor, for detecting the real work electric current of single battery.
Preferably, SOE estimation device further includes voltage sensor connected to the processor, for detecting the open circuit electricity of battery
Pressure.
Preferably, SOE estimation device further includes memory connected to the processor, and memory is configured to store SOC value
With the corresponding relationship of battery open circuit voltage.
Preferably, SOE estimation device further includes display connected to the processor, and display is display configured to battery pack
SOE value.
Through the above technical solutions, the SOC of the SOC estimation device each battery of real-time estimation in battery pack use process
Value passes through the SOC that euqalizing current corrects balancing battery to obtain the SOC value of battery pack, and in the case where battery opens balanced
Value improves the accuracy to battery pack SOC estimation to update the SOC value of battery pack.
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 a kind of process of SOC estimation method based on active equalization of battery according to an embodiment of the present invention
Figure；
Fig. 2 is a kind of process of SOC estimation method based on active equalization of battery according to an embodiment of the present invention
Figure；
Fig. 3 is a kind of process of SOC estimation method based on active equalization of battery according to an embodiment of the present invention
Figure；
The battery that Fig. 4 shows one embodiment of the present invention mends the circuit diagram of electric-type active equalization；
Fig. 5 is a kind of signal of SOC estimation device based on active equalization of battery according to an embodiment of the present invention
Block diagram.
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 a kind of process of SOC estimation method based on active equalization of battery according to an embodiment of the present invention
Figure.As shown in Figure 1, in one embodiment of the present invention, a kind of SOC estimation method based on active equalization of battery is provided,
The SOC estimation method may include:
In step s101, the SOC value of each single battery in battery pack under current state is obtained；
In step s 102, using the smallest SOC value of numerical value in the SOC value of each single battery as the SOC value of battery pack,
And corresponding single battery is determined as quasi- by balancing battery；
In step s 103, whether judgement is quasi- opens equilibrium by balancing battery；
In step S104, in the case where judgement is quasi- balanced by balancing battery unlatching, quasi- it will be defined as by balancing battery
By balancing battery, and obtain by the euqalizing current of balancing battery；
In step s105, it is corrected according to euqalizing current to by the SOC value of balancing battery, to obtain by balancing battery
Correction after SOC value；
In step s 106, according to the SOC value after correction, judge whether SOC value in battery pack is remained as by balancing battery
Minimum single battery；
In step s 107, the case where judging to be remained as the minimum single battery of SOC value in battery pack by balancing battery
Under, the SOC value of battery pack is updated with the SOC value after the correction by balancing battery；
In step S108, the SOC value of battery pack is stored and exported.
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 the SOC value of each single battery can specifically be adopted with obtaining the SOC value of each single battery in battery pack under current state
It is indicated with 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 battery pack use process, the balanced single battery necessarily the smallest single battery of SOC value in battery is opened,
It is determining namely in the present invention to intend by balancing battery, therefore judging whether battery pack opens balanced is to judge to intend by equilibrium electricity
Whether equilibrium is opened in pond.In one embodiment of the present invention, such as the quasi- equilibrium by balancing battery of real-time detection can be passed through
Electric current judges whether it opens equilibrium.If intending by the euqalizing current of balancing battery being zero, illustrate that this is quasi- by balancing battery
Equilibrium does not start；If the quasi- euqalizing current by balancing battery is nonzero value, illustrate the quasi- equilibrium unlatching by balancing battery.Respectively
It the real work electric current of a single battery and can for example be detected by current sensor by the euqalizing current of balancing battery, it can also
To be detected by BMS.
In the case where judgement is quasi- balanced by balancing battery unlatching, which can be corrected using formula (2)
SOC value:
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.
In one embodiment of the present invention, SOC estimation method can also include；
In step S109, judge no longer be by balancing battery the single battery that SOC value is minimum in battery pack feelings
Under condition, the SOC of battery pack is updated with the smallest SOC value of numerical value in the SOC value of each single battery in battery pack under current state
Value.
Since the estimation of the SOC value to battery pack is real-time estimation and to store display in its use process, with to using
Family provides real time information to be judged.Therefore above-mentioned SOC estimation method persistently carries out in the use process of battery pack.
Fig. 2 is a kind of process of SOC estimation method based on active equalization of battery according to an embodiment of the present invention
Figure.As shown in Fig. 2, in one embodiment of the present invention, a kind of SOC estimation method based on active equalization of battery is provided,
The SOC estimation method can also include:
In step S210, judge battery pack whether still in use state；
In the case where judging battery pack still in use state, each single battery under current state is estimated again
SOC value, to redefine the SOC value of battery pack and intend by balancing battery, and again with the SOC value after the correction by balancing battery
Or the smallest SOC value of numerical value updates the SOC value of battery pack in the SOC value of each single battery under current state.
Electricity is initial on the battery pack, for example, can be estimated by above-mentioned current integration method the SOC value of each single battery come
The SOC value (the SOC initial value of namely each single battery) for obtaining each single battery in battery pack under current state, can also
To obtain each monomer electricity in battery pack by the SOC value for reading each single battery saved before electricity under the battery pack last time
The SOC initial value in pond.Fig. 3 show battery pack power on initially through read the battery pack last time under electricity come to obtain SOC it is initial
The embodiment of the SOC value of each single battery is estimated in value, use process thereafter by current integration method.
Fig. 3 is a kind of process of SOC estimation method based on active equalization of battery according to an embodiment of the present invention
Figure.As shown in figure 3, in one embodiment of the present invention, a kind of SOC estimation method based on active equalization of battery is provided,
Compared with Fig. 2, which can also include:
In step S301, battery pack is powered on initially, reads each single battery saved before electricity under the battery pack last time
SOC value；
In step s 302, judge whether battery pack meets standing calibration condition；
In step S303, in the case where judging that battery pack meets standing calibration condition, in the battery pack of reading one
The SOC value saved before secondary lower electricity carries out standing calibration.
The standing calibration condition of battery pack for example can be battery pack time of repose more than preset duration, and preset duration is for example
It can be two hours.
In one embodiment of the present invention, stand calibrating to the SOC value of each single battery can specifically include:
Obtain the open-circuit voltage of each single battery；
According to open-circuit voltage, the corresponding relationship of the SOC value prestored and battery open circuit voltage, to the SOC of each single battery
Value carries out standing calibration.
The open-circuit voltage of each single battery can for example be detected by voltage sensor, can also be examined by BMS
It surveys.
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 of the SOC value as shown in table 1 and battery open circuit voltage
Table.
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 open-circuit voltage, the SOC value prestored pass corresponding with battery open circuit voltage
System, carrying out standing calibration concrete mode to the SOC value of each single battery for example may is that
According to the battery open circuit voltage detected, the corresponding relationship of the SOC value prestored and battery open circuit voltage, corresponded to
The SOC calibration value of single battery；
Judge whether the difference between the SOC value read and SOC calibration value is less than or equal to allowable error, allowable error example
It such as can be 0.5%；
In the case that difference between the SOC value and SOC calibration value that judgement is read is less than or equal to allowable error, retain
The SOC value that original is read；
In the case that difference between the SOC value and SOC calibration value that judgement is read is greater than allowable error, calibrated with SOC
Value updates the former SOC value read.
According to the battery open circuit voltage detected, the corresponding relationship of the SOC value prestored and battery open circuit voltage, corresponded to
The SOC calibration value of single battery can specifically include:
In the case where including the battery open circuit voltage values detected in mapping table, table look-at is obtained；
In the case where not including the battery open circuit voltage values detected in mapping table, the mode of linear interpolation is taken
Calculate the SOC calibration value of corresponding single battery.
Battery balanced mode is divided into passive balanced and active equalization, and active equalization includes mending electric-type active equalization, energy again
The various ways such as moving type active equalization.Any one of the above SOC estimation method provided by the invention is suitable for benefit shown in Fig. 4
Electric-type active equalization mode.
The battery that Fig. 4 shows one embodiment of the present invention mends the circuit diagram of electric-type active equalization.Such as Fig. 4 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 in Fig. 4
Indicate euqalizing current sensor, for detecting euqalizing current, K1, K2, K3 are controllable switch, B1, B2 ..., Bn expression group
At the single battery of battery pack.
Fig. 5 is a kind of signal of SOC estimation device based on active equalization of battery according to an embodiment of the present invention
Block diagram.The SOC estimation device can be used for executing any one SOC based on active equalization of battery in above embodiment and estimate
Meter method.Specifically, as shown in figure 5, the SOC estimation device includes processor 10, in an embodiment of the invention,
Processor 10 may be configured to:
Obtain the SOC value of each single battery in battery pack under current state；
Using the smallest SOC value of numerical value in the SOC value of each single battery as the SOC value of battery pack, and by corresponding list
Body battery is determined as quasi- by balancing battery；
Whether judgement is quasi- opens equilibrium by balancing battery；
In the case where judgement is quasi- balanced by balancing battery unlatching, quasi- will be defined as by balancing battery by balancing battery, and
It obtains by the euqalizing current of balancing battery；
It is corrected according to euqalizing current to by the SOC value of balancing battery, to obtain by the SOC after the correction of balancing battery
Value；
According to the SOC value after correction, judge the monomer electricity that SOC value is minimum in battery pack whether is remained as by balancing battery
Pond；
In the case where judging to be remained as the minimum single battery of SOC value in battery pack by balancing battery, by balanced electricity
SOC value after the correction in pond updates the SOC value of battery pack；
In the case where judging no longer has been the minimum single battery of SOC value in battery pack by balancing battery, with current shape
The smallest SOC value of numerical value updates the SOC value of battery pack in the SOC value of each single battery under state；
Store and export the SOC value of battery pack.
In one embodiment of the present invention, processor can be configured to:
Judge battery pack whether still in use state；
In the case where judging battery pack still in use state, each single battery under current state is estimated again
SOC value, to redefine the SOC value of battery pack and intend by balancing battery, and again with the SOC value after the correction by balancing battery
Or the smallest SOC value of numerical value updates the SOC value of battery pack in the SOC value of each single battery under current state.
In one embodiment of the present invention, the case where obtaining the SOC value of each single battery by reading manner
Under, processor can be additionally configured to:
Judge whether battery pack meets standing calibration condition；
In the case where judging that battery pack meets standing calibration condition, to what is saved before electricity under the battery pack last time of reading
SOC value carries out standing calibration.
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 an embodiment of the invention, which can also include that voltage connected to the processor passes
Sensor 60, for detecting the open-circuit voltage of battery.
In addition, the SOC 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.
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 SOC 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 SOC estimation method when being executed by processor.
Pass through above embodiment, the SOC of the SOC estimation method each battery of real-time estimation in battery pack use process
Value passes through the SOC that euqalizing current corrects balancing battery to obtain the SOC value of battery pack, and in the case where battery opens balanced
Value improves the accuracy to battery pack SOC estimation to update the SOC value of battery pack.
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 (10)
1. a kind of SOC estimation device based on active equalization of battery, which is characterized in that the SOC estimation device includes processor,
The processor is configured to:
Obtain the SOC value of each single battery in battery pack under current state；
Using the smallest SOC value of numerical value in the SOC value of each single battery as the SOC value of battery pack, and by corresponding list
Body battery is determined as quasi- by balancing battery；
Judge described quasi- whether equilibrium is opened by balancing battery；
In the case where judging described quasi- balanced by balancing battery unlatching, intend being defined as by balancing battery by balanced electricity by described
Pond, and obtain the euqalizing current by balancing battery；
It is corrected to described by the SOC value of balancing battery according to the euqalizing current, to obtain the school by balancing battery
SOC value after just；
According to the SOC value after the correction, judge described the monomer that SOC value is minimum in battery pack whether is remained as by balancing battery
Battery；
Judge it is described the minimum single battery of SOC value in battery pack is remained as by balancing battery in the case where, with described equal
SOC value after the correction of weighing apparatus battery updates the SOC value of the battery pack；
Store and export the SOC value of the battery pack.
2. SOC estimation device according to claim 1, which is characterized in that the processor is also configured to
In the case where judging described by balancing battery and being no longer the minimum single battery of SOC value in battery pack, with current shape
The smallest SOC value of numerical value updates the SOC value of the battery pack in the SOC value of each single battery under state.
3. SOC estimation device according to claim 2, which is characterized in that the processor is also configured to
Judge the battery pack whether still in use state；
In the case where judging the battery pack still in use state, each single battery under current state is estimated again
SOC value, to redefine the SOC value of the battery pack and described quasi- by balancing battery, and again with described by balancing battery
Correction after SOC value or current state under each single battery SOC value in described in the smallest SOC value of numerical value updates
The SOC value of battery pack.
4. SOC estimation device according to claim 1, which is characterized in that each list in battery pack under acquisition current state
The SOC value of body battery includes:
Read the SOC value of each single battery saved before electricity under the battery pack last time；Or
Estimate the SOC value of each single battery under current state.
5. SOC estimation device according to claim 4, which is characterized in that the processor is also configured to
Following operation is executed in the case where obtaining the SOC value of each single battery by reading manner:
Judge whether battery pack meets standing calibration condition；
In the case where judging that battery pack meets standing calibration condition, to what is saved before electricity under the battery pack last time of reading
SOC value carries out standing calibration.
6. SOC estimation device according to claim 5, which is characterized in that carried out to the SOC value of each single battery
Calibration is stood to specifically include:
Obtain the open-circuit voltage of each single battery；
According to the open-circuit voltage, the corresponding relationship of the SOC value prestored and battery open circuit voltage, to each single battery
SOC value carries out standing calibration.
7. SOE estimation device according to claim 1, which is characterized in that the SOE estimation device further include:
The euqalizing current sensor being connected to the processor, for detecting the euqalizing current of the single battery；
The operating current sensor being connected to the processor, for detecting the real work electric current of the single battery.
8. SOE estimation device according to claim 6, which is characterized in that the SOE estimation device further includes and the place
The voltage sensor for managing device connection, for detecting the open-circuit voltage of battery.
9. SOE estimation device according to claim 6, which is characterized in that the SOE estimation device further includes and the place
The memory of device connection is managed, the memory is configured to store the corresponding relationship of SOC value and battery open circuit voltage.
10. SOE estimation device according to claim 1, which is characterized in that the SOE estimation device further include with it is described
The display of processor connection, the display are display configured to the SOE value of battery pack.
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| CN102361100A (en) * | 2011-10-19 | 2012-02-22 | 奇瑞汽车股份有限公司 | Method for controlling balance of power lithium ion battery |
| CN105857109A (en) * | 2016-06-03 | 2016-08-17 | 河北工业大学 | Electric automobile power management system based on single chip microcomputer |
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