CN109742818A - Battery balanced appraisal procedure and device, computer equipment, storage medium - Google Patents
Battery balanced appraisal procedure and device, computer equipment, storage medium Download PDFInfo
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- CN109742818A CN109742818A CN201811546383.7A CN201811546383A CN109742818A CN 109742818 A CN109742818 A CN 109742818A CN 201811546383 A CN201811546383 A CN 201811546383A CN 109742818 A CN109742818 A CN 109742818A
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The present invention relates to a kind of battery balanced appraisal procedures and device, computer equipment, storage medium, by the open-circuit voltage for obtaining each single battery core, the state-of-charge of each single battery core is obtained according to SOC-OCV curve, and then the residual capacity of each single battery core is calculated, it is compared with the difference of the minimum value in residual capacity with given threshold by the residual capacity of each single battery core, thus balanced assessment information of the output to single battery core each in power battery.This process could execute during the charging process without limitation, as long as single battery core meets equilibrium condition, even if power battery is also that can carry out equilibrium in charge and discharge process, this has been considerably improved equalization efficiency.
Description
Technical field
The present invention relates to technical field of power battery management, more particularly to a kind of battery balanced appraisal procedure and device,
Computer equipment, storage medium.
Background technique
Due to the limitation of battery core technology level, battery core is difficult to absolutely consistency at present.In addition, power
Battery in use due between single battery core there may be differences such as self-discharge rate, operating temperature, depth of discharge,
It will lead to that consistency between single battery core is poor, seriously affect performance and the service life of power battery.Therefore, it is necessary to pass through battery core pressure difference
Balancing technique improves the inconsistency between single battery core.
Currently, the equalization methods that battery management system (BMS) industry is formulated are all based on charging process exploitation, if single
Pressure difference between body battery core is greater than some value, then equilibrium is opened, conversely, then stopping equilibrium.This equalization methods is only during the charging process
It could execute, equalization efficiency is very low.
Summary of the invention
Based on this, it is necessary to a kind of battery balanced appraisal procedure and device, computer equipment, storage medium are provided, with solution
Certainly traditional battery equalization method could only execute during the charging process, the low problem of equalization efficiency.
A kind of battery balanced appraisal procedure, comprising the following steps:
Obtain open-circuit voltage of each single battery core under current state in power battery；
According to SOC-OCV curve of the power battery under current state, each list is obtained by the open-circuit voltage
The state-of-charge of body battery core；
The residual capacity of each single battery core is calculated according to the state-of-charge of each single battery core；
Obtain the minimum value in the power battery in the residual capacity of all single battery cores；
Calculate the residual capacity of each single battery core and the difference of the minimum value；
Compare the difference and given threshold, exports the balanced assessment letter to the single battery core each in the power battery
Breath.
In one of the embodiments, in the difference and given threshold, export in the power battery
In the step of balanced assessment information of each single battery core, if the difference is greater than the given threshold, output is corresponding
The single battery core needs to carry out balanced information, if the difference is not more than the given threshold, exports corresponding described
Single battery core is without carrying out balanced information.
The open-circuit voltage obtained in one of the embodiments, is when the power battery stands and no less than sets
Between after open-circuit voltage；And/or
The given threshold is the 1%~3% of the nominal capacity of the single battery core.
The residual capacity of each single battery core is by the charged of each single battery core in one of the embodiments,
State, health status and nominal capacity are calculated.
Each monomer is calculated in the state-of-charge according to each single battery core in one of the embodiments,
The step of residual capacity of battery core, comprising:
Obtain health status of each single battery core under current state；
The residual capacity of each single battery core is calculated according to formula (I):
Ci=SOCi*SOHi*C0 (Ⅰ)
Wherein, CiFor the residual capacity of each single battery core, SOCiFor the state-of-charge of each single battery core, SOHi
For the health status of each single battery core, C0For the nominal capacity of the single battery core.
It further include by the difference, described if the difference is greater than the given threshold in one of the embodiments,
The step of time for balance of the corresponding single battery core is calculated in given threshold and euqalizing current.
If the difference is greater than the given threshold, the corresponding single battery core in one of the embodiments,
Time for balance be to be calculated according to formula (II)；
Ti=(Ci-Cmin-Cthr)/Ibal(II),
Wherein, TiFor the time for balance of the corresponding single battery core, CiFor the residual capacity of each single battery core, Cmin
For the minimum value, CthrFor the given threshold, IbalFor euqalizing current.
A kind of battery balanced assessment device, comprising:
Open-circuit voltage obtains module, for obtaining open-circuit voltage of each single battery core under current state in power battery；
State-of-charge obtains module, for the SOC-OCV curve according to the power battery under current state, by described
Open-circuit voltage obtains the state-of-charge of each single battery core；
Residual capacity computing module, for each monomer electricity to be calculated according to the state-of-charge of each single battery core
The residual capacity of core；
Least residue procurement of reserve capacity module, for obtaining in the power battery in the residual capacity of all single battery cores
Minimum value；
Residual capacity difference calculating module, for calculating the residual capacity of each single battery core and the difference of the minimum value
Value；
Balanced judgment module is used for the difference and given threshold, exports to the list each in the power battery
The balanced assessment information of body battery core.
A kind of computer equipment, has processor and memory, and the memory is stored with computer program, the calculating
When machine program is executed by the processor, so that the processor executes the battery balanced appraisal procedure of any of the above-described embodiment
Step.
A kind of computer readable storage medium, is stored thereon with computer program, and the computer program is held by processor
When row, so that the step of processor executes the battery balanced appraisal procedure of any of the above-described embodiment.
Compared with existing scheme, the invention has the following advantages:
Above-mentioned battery balanced appraisal procedure and device, computer equipment, storage medium, by obtaining opening for each single battery core
Road voltage obtains the state-of-charge of each single battery core according to SOC-OCV curve, and then the remaining of each single battery core is calculated and holds
Amount, is compared, thus defeated with given threshold with the difference of the minimum value in residual capacity by the residual capacity of each single battery core
Out to the balanced assessment information of single battery core each in power battery.This process could execute during the charging process without limitation, only
Single battery core is wanted to meet equilibrium condition, even if power battery is also that can carry out balanced in charge and discharge process, this is just significantly
Improve equalization efficiency.
Detailed description of the invention
Fig. 1 is the flow diagram of the battery balanced appraisal procedure of one embodiment of the invention；
Fig. 2 is a kind of SOC-OCV curve graph of battery pack at a temperature；
Fig. 3 is the modular structure schematic diagram of the battery balanced assessment device of one embodiment of the invention.
Specific embodiment
To facilitate the understanding of the present invention, a more comprehensive description of the invention is given in the following sections with reference to the relevant attached drawings.In attached drawing
Give presently preferred embodiments of the present invention.But the invention can be realized in many different forms, however it is not limited to this paper institute
The embodiment of description.On the contrary, purpose of providing these embodiments is keeps the understanding to the disclosure more thorough
Comprehensively.
Unless otherwise defined, all technical and scientific terms used herein and belong to technical field of the invention
The normally understood meaning of technical staff is identical.Term as used herein in the specification of the present invention is intended merely to description tool
The purpose of the embodiment of body, it is not intended that in the limitation present invention.Term as used herein "and/or" includes one or more phases
Any and all combinations of the listed item of pass.
As shown in Figure 1, the battery balanced appraisal procedure of one embodiment of the invention, comprising the following steps:
Step S110: open-circuit voltage of each single battery core under current state in power battery is obtained.
The end voltage of open-circuit voltage, i.e. battery under open-circuit condition.There is battery management system in battery pack in battery pack
Every a string of the single battery cores in portion are monitored, and the open-circuit voltage of each single battery core can be read by battery management system.
Step S210: according to SOC-OCV curve of the power battery under current state, each monomer electricity is obtained by open-circuit voltage
The state-of-charge of core.
The characteristic curve that SOC-OCV curve, i.e. state-of-charge-open circuit voltage curve are single battery core, a temperature are corresponding
One SOC-OCV curve.Fig. 2 is to show a kind of SOC-OCV curve of battery core at one temperature.Due to electricity each in battery pack
Core is the same, therefore is consistent in the SOC-OCV curve of synthermal lower each battery core, the SOC-OCV of battery pack in the present invention
Curve is the SOC-OCV curve of each battery core.State-of-charge and open-circuit voltage are one-to-one on SOC-OCV curve, by true
Fixed open-circuit voltage can find corresponding state-of-charge on curve.
Step S310: the residual capacity of each single battery core is calculated according to the state-of-charge of each single battery core.
Residual capacity refers to battery remaining amount of capacity after the use by certain time.
Step S410: the minimum value in power battery in the residual capacity of all single battery cores is obtained.
Due to the inconsistency between single battery core, the residual capacity of different single battery cores is had differences.It is obtaining respectively
After the residual capacity of single battery core, this step by comparing the residual capacity of each single battery core size, obtain it is therein most
Small remaining capacity value.
Step S510: the residual capacity of each single battery core and the difference of minimum value are calculated.
Step S610: comparing difference and given threshold, exports the balanced assessment information to single battery core each in power battery.
In a wherein example, compares difference and given threshold in step S610, export to monomer each in power battery
In the balanced assessment information of battery core, if difference is greater than given threshold, exports corresponding single battery core and need to carry out balanced letter
Breath exports corresponding single battery core without carrying out balanced information if difference is not more than given threshold.
In a wherein example, given threshold is the 1%~3% of the nominal capacity of single battery core.Nominal capacity, i.e., it is electric
Discharge capacity when pond 0.2C discharges.
In a wherein example, the open-circuit voltage of acquisition is to stand the open circuit after being no less than setting time in power battery
Voltage.
Further, the SOC-OCV curve in step S110 according to power battery under current state, by each single battery core
It is further comprising the steps of before open-circuit voltage obtains the state-of-charge of each single battery core:
The time of repose for obtaining power battery carries out next step if time of repose is no less than setting time.
The pressure difference of traditional charge equalization method monitoring is the dynamic differential pressure of battery core, cannot really be reflected true between battery core
Voltage differences.
Time of repose, the i.e. loop current of battery pack are less than the time of 2A.This exemplary battery balanced appraisal procedure is root
It is got according to the open-circuit voltage calculating after standing, the polarized influence of battery core can be eliminated, more accurately reflect the consistent of single battery core
Property problem, and increase balanced chance.If time of repose is less than setting time, standing state is kept, without in next step
Suddenly.
Wherein, more preferably, setting time is no less than 2h.Further, setting time 2h, i.e. time of repose are no less than 2h
When, then carry out next step.
The open-circuit voltage of battery core can relatively accurately reflect the consistency problem of battery core, when industry experience thinks that battery core is stood
Between be greater than 2h, the polarization phenomena inside battery core substantially eliminate, and measure battery core open-circuit voltage i.e. battery core current state at this time
Real voltage.
In a wherein example, the residual capacity of each single battery core is state-of-charge by each single battery core, health
State and nominal capacity are calculated.
Further, the residual capacity of each single battery core is calculated according to the state-of-charge of each single battery core by step S310
Step, comprising:
Obtain health status of each single battery core under current state；
The residual capacity of each single battery core is calculated according to formula (I):
Ci=SOCi*SOHi*C0 (Ⅰ)
Wherein, CiFor the residual capacity of each single battery core.
SOCiFor the state-of-charge of each single battery core, i.e., by the state-of-charge of the obtained each single battery core of step S210.C0For
The nominal capacity of single battery core.SOHiFor the health status of each single battery core, SOH (State of Health), also referred to as service life
State, degree of aging etc. are that the dynamic full state of power battery is released with certain multiplying power discharging to blanking voltage under standard conditions
Capacity and its corresponding to nominal capacity ratio.The SOH value of each single battery core can be obtained by a variety of existing methods, herein
It does not state carefully.
It further include by difference, given threshold and euqalizing current if difference is greater than given threshold in a wherein example
The step of time for balance of corresponding single battery core is calculated.
It further, further include that the equal of corresponding single battery core is calculated according to formula (II) if difference is greater than given threshold
The step of weighing apparatus time；
Ti=(Ci-Cmin-Cthr)/Ibal(II),
Wherein, TiFor the time for balance of corresponding single battery core；CiFor the residual capacity of each single battery core, CminFor by step
The minimum value that S410 is obtained；CthrFor given threshold；IbalFor euqalizing current, euqalizing current is determined by equalizing circuit, power battery
In equalizing circuit determine, then euqalizing current i.e. determine.
The battery balanced appraisal procedure of above-mentioned example is opened and is stopped based on time for balance, and equilibrium is opened and stopped
Only it is not currently at any state limit by power battery, as long as so single battery core meets equilibrium condition, even if power battery
It is also that can carry out equilibrium in charge and discharge process, this has been considerably improved equalization efficiency.
After single battery core equalization function is opened, the time for balance ti of single battery core is recorded and updated in real time, it is balanced
Remaining time ▽ Ti=Ti-ti continues starting the equalization function of the battery core if ▽ Ti is greater than 0, if ▽ Ti is equal to 0, stops
The equalization function of the battery core.
Correspondingly, if difference is not more than given threshold, Ti=0 does not carry out corresponding single battery core balanced.
In a wherein example, after the step of time for balance of corresponding single battery core is calculated, further include
The step of judgement equilibrium stops:
Time for balance ti, the balanced remaining time ▽ Ti=Ti-ti for recording and updating in real time single battery core, if ▽ Ti
Greater than 0, then judgement continues starting the equalization function of the battery core, if ▽ Ti is equal to 0, judges that the equalization function of the battery core stops.
Below by taking a more specific exemplary battery balanced appraisal procedure as an example, the invention will be further described.
The battery balanced appraisal procedure the following steps are included:
The time of repose for obtaining power battery carries out next step if time of repose is no less than setting time (2h).
Obtain open-circuit voltage OCV of each single battery core under current state in power batteryi。
According to SOC-OCV curve of the power battery under current state, by the open-circuit voltage OCV of each single battery coreiIt obtains
The state-of-charge SOC of each single battery corei。
Obtain health status SOH of each single battery core under current statei。
The residual capacity of each single battery core is calculated according to formula (I):
Ci=SOCi*SOHi*C0 (Ⅰ)。
Obtain the minimum value C in power battery in the residual capacity of all single battery coresmin。
Calculate the residual capacity of each single battery core and the difference C of minimum valuei-Cmin。
Compare difference Ci-CminWith given threshold CthrIf difference Ci-CminGreater than given threshold Cthr, it is determined that it is corresponding single
Body battery core needs to carry out balanced；If difference Ci-CminNo more than given threshold Cthr, it is determined that corresponding single battery core is without carrying out
It is balanced.
If difference Ci-CminGreater than given threshold Cthr, when the equilibrium of corresponding single battery core is calculated according to formula (II)
Between:
Ti=(Ci-Cmin-Cthr)/Ibal (Ⅱ)。
After single battery core equalization function is opened, the time for balance ti of single battery core is recorded and updated in real time, and equilibrium is surplus
Remaining time ▽ Ti=Ti-ti continues starting the equalization function of the battery core if ▽ Ti is greater than 0, if ▽ Ti is equal to 0, stopping should
The equalization function of battery core.
Further, as shown in figure 3, the present invention also provides a kind of battery balanced assessment device 100, the battery balanced assessment
Device 100 includes that open-circuit voltage obtains module 110, state-of-charge obtains module 120, residual capacity computing module 130, minimum remain
Remaining procurement of reserve capacity module 140, residual capacity difference calculating module 150 and balanced unlatching judgment module 160.Specifically:
Open-circuit voltage obtains module 110 and is used to obtain open circuit electricity of each single battery core under current state in power battery
Pressure；
State-of-charge obtains module 120 and is used for for the SOC-OCV curve according to the power battery under current state,
The state-of-charge of each single battery core is obtained by the open-circuit voltage；
Residual capacity computing module 130 is used to be calculated the surplus of each single battery core according to the state-of-charge of each single battery core
Covolume amount；
Least residue procurement of reserve capacity module 140 is used to obtain the minimum value in the residual capacity of all single battery cores；
Residual capacity difference calculating module 150 is for calculating the residual capacity of each single battery core and the difference of minimum value；
Balanced judgment module 160 is exported for comparing difference and given threshold to the equal of single battery core each in power battery
Weighing apparatus assessment information.
In a wherein example, battery balanced assessment device 100 further includes starting judgment module, starts judgment module and uses
In the time of repose for obtaining power battery, if time of repose is no less than setting time, open-circuit voltage obtains the execution of module 110 and refers to
It enables.
In a wherein example, residual capacity computing module 130 includes that health status obtains module and the first calculating mould
Block.Wherein, health status obtains module for obtaining health status of each single battery core under current state；First computing module
For the residual capacity of each single battery core to be calculated according to formula (I):
Ci=SOCi*SOHi*C0 (Ⅰ)
Wherein, CiFor the residual capacity of each single battery core, SOCiFor the state-of-charge of each single battery core, C0For single battery core
Nominal capacity, SOHiFor the health status of each single battery core.
In a wherein example, battery balanced assessment device further includes time for balance computing module, and time for balance calculates
Module is used to be calculated the time for balance of corresponding single battery core according to formula (II)；
Ti=(Ci-Cmin-Cthr)/Ibal(II),
Wherein, TiFor the time for balance of corresponding single battery core, CiFor the residual capacity of each single battery core, CminFor minimum
Value, CthrFor given threshold, IbalFor euqalizing current.
In a wherein example, battery balanced assessment device 100 further includes balanced stopping judgment module, which stops
Judgment module is used to record and update in real time time for balance ti, the balanced remaining time ▽ Ti=Ti-ti of single battery core, if
▽ Ti is greater than 0, then judgement continues starting the equalization function of the battery core, if ▽ Ti is equal to 0, judges that the equalization function of the battery core is stopped
Only.
The present invention also provides a kind of computer equipment, which has processor and memory, memory storage
There is computer program, when computer program is executed by processor, so that processor executes any of the above-described exemplary battery balanced comment
The step of estimating method.
The present invention also provides a kind of computer readable storage mediums, are stored thereon with computer program, computer program quilt
When processor executes, so that the step of processor executes any of the above-described exemplary battery balanced appraisal procedure.
Above-mentioned battery balanced appraisal procedure and device, computer equipment, storage medium, by obtaining opening for each single battery core
Road voltage obtains the state-of-charge of each single battery core according to SOC-OCV curve, and then the remaining of each single battery core is calculated and holds
Amount, is compared, thus defeated with given threshold with the difference of the minimum value in residual capacity by the residual capacity of each single battery core
Out to the balanced assessment information of single battery core each in power battery.This process could execute during the charging process without limitation, only
Single battery core is wanted to meet equilibrium condition, even if power battery is also that can carry out balanced in charge and discharge process, this is just significantly
Improve equalization efficiency.
By the equalization function of battery core, the consistency of each single battery core can guarantee, guarantee the depth of discharge of single battery core, prolong
The service life of long battery core.
Each technical characteristic of above embodiments can be combined arbitrarily, for simplicity of description, not to above-described embodiment
In each technical characteristic it is all possible combination be all described, as long as however, the combination of these technical characteristics be not present lance
Shield all should be considered as described in this specification.
Only several embodiments of the present invention are expressed for above embodiments, and the description thereof is more specific and detailed, but can not
Therefore it is construed as limiting the scope of the patent.It should be pointed out that for those of ordinary skill in the art,
Under the premise of not departing from present inventive concept, various modifications and improvements can be made, and these are all within the scope of protection of the present invention.
Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (10)
1. a kind of battery balanced appraisal procedure, which comprises the following steps:
Obtain open-circuit voltage of each single battery core under current state in power battery；
According to SOC-OCV curve of the power battery under current state, each monomer electricity is obtained by the open-circuit voltage
The state-of-charge of core；
The residual capacity of each single battery core is calculated according to the state-of-charge of each single battery core；
Obtain the minimum value in the power battery in the residual capacity of all single battery cores；
Calculate the residual capacity of each single battery core and the difference of the minimum value；
Compare the difference and given threshold, exports the balanced assessment information to the single battery core each in the power battery.
2. battery balanced appraisal procedure as described in claim 1, which is characterized in that in the difference and setting threshold
Value exports in balanced the step of assessing information to the single battery core each in the power battery, if the difference is greater than institute
Given threshold is stated, then the corresponding single battery core of output needs to carry out balanced information, if the difference is set no more than described
Determine threshold value, then exports the corresponding single battery core without carrying out balanced information.
3. battery balanced appraisal procedure as described in claim 1, which is characterized in that the open-circuit voltage of acquisition is described
Power battery stands the open-circuit voltage after being no less than setting time；And/or
The given threshold is the 1%~3% of the nominal capacity of the single battery core.
4. battery balanced appraisal procedure as described in claim 1, which is characterized in that the residual capacity of each single battery core is
It is calculated by state-of-charge, health status and the nominal capacity of each single battery core.
5. battery balanced appraisal procedure as claimed in claim 4, which is characterized in that the lotus according to each single battery core
The step of residual capacity of each single battery core is calculated in electricity condition, comprising:
Obtain health status of each single battery core under current state；
The residual capacity of each single battery core is calculated according to formula (I):
Ci=SOCi*SOHi*C0(Ⅰ)
Wherein, CiFor the residual capacity of each single battery core, SOCiFor the state-of-charge of each single battery core, SOHiIt is each
The health status of the single battery core, C0For the nominal capacity of the single battery core.
6. battery balanced appraisal procedure as claimed in any one of claims 1 to 5, which is characterized in that if the difference is greater than institute
Given threshold is stated, further includes that the corresponding monomer electricity is calculated by the difference, the given threshold and euqalizing current
The step of time for balance of core.
7. battery balanced appraisal procedure as claimed in claim 6, which is characterized in that if the difference is greater than the setting threshold
Value, the time for balance of the corresponding single battery core is calculated according to formula (II)；
Ti=(Ci-Cmin-Cthr)/Ibal(II),
Wherein, TiFor the time for balance of the corresponding single battery core, CiFor the residual capacity of each single battery core, CminFor institute
State minimum value, CthrFor the given threshold, IbalFor euqalizing current.
8. a kind of battery balanced assessment device characterized by comprising
Open-circuit voltage obtains module, for obtaining open-circuit voltage of each single battery core under current state in power battery；
State-of-charge obtains module, for the SOC-OCV curve according to the power battery under current state, by the open circuit
Voltage obtains the state-of-charge of each single battery core；
Residual capacity computing module, for each single battery core to be calculated according to the state-of-charge of each single battery core
Residual capacity；
Least residue procurement of reserve capacity module, for obtaining the minimum in the power battery in the residual capacity of all single battery cores
Value；
Residual capacity difference calculating module, for calculating the residual capacity of each single battery core and the difference of the minimum value；
Balanced judgment module is used for the difference and given threshold, and output is to the monomer electricity each in the power battery
The balanced assessment information of core.
9. a kind of computer equipment, which is characterized in that there is processor and memory, the memory is stored with computer journey
Sequence, when the computer program is executed by the processor, so that the processor is executed such as any one of claim 1~7 institute
The step of battery balanced appraisal procedure stated.
10. a kind of computer readable storage medium, is stored thereon with computer program, which is characterized in that the computer program
When being executed by processor, so that the processor executes battery balanced appraisal procedure as described in any one of claims 1 to 7
Step.
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