CN109143081A - A kind of lithium ion battery of electric automobile capacity estimation on line method and apparatus - Google Patents
A kind of lithium ion battery of electric automobile capacity estimation on line method and apparatus Download PDFInfo
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- CN109143081A CN109143081A CN201811180859.XA CN201811180859A CN109143081A CN 109143081 A CN109143081 A CN 109143081A CN 201811180859 A CN201811180859 A CN 201811180859A CN 109143081 A CN109143081 A CN 109143081A
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Abstract
Embodiment of the present invention discloses a kind of lithium ion battery of electric automobile capacity estimation on line method and apparatus.Method include: obtain last time powered on the moment battery pack state-of-charge (SOC) and this power on the battery pack SOC at moment；Calculate last time power on the moment battery pack SOC and this power on the changing value Δ SOC between the battery pack SOC at moment；The battery pack is obtained to power on constantly from last time to the accumulation ampere-hour capacity value Δ ah at moment electric under last time；Will accumulation ampere-hour capacity value Δ ah divided by changing value Δ SOC's as a result, being determined as current battery capacity value.Embodiment of the present invention compares more traditional evaluation method, has the advantages that precision height, calculation amount be small, and suitable estimation on line not damaged to battery.
Description
Technical field
Embodiment of the present invention is related to automobile technical field, in particular to a kind of lithium ion battery of electric automobile capacity is online
Evaluation method and device.
Background technique
Have in national newest standards " term and definition of automobile and trailer type " (GB/T 3730.1-2001) to automobile
Such as give a definition: by power drive, the vehicle of the non-track carrying with 4 or 4 or more wheels is mainly used for: carrying personnel
And (or) cargo；Draw the vehicle of carrying personnel and (or) cargo；Specific use.Energy shortage, oil crisis and environmental pollution
It grows in intensity, brings tremendous influence to people's lives, be directly related to the sustainable development of national economy and society.The world is each
State is all in active development new energy technology.
Lithium ion (Li+) battery is a kind of secondary cell (rechargeable battery), it relies primarily on lithium ion in anode and cathode
Between it is mobile come work.In charge and discharge process, Li+Insertion and deintercalation back and forth between two electrodes: when charging, Li+From anode
Deintercalation is embedded in cathode by electrolyte, and cathode is in lithium-rich state；It is then opposite when electric discharge.The advance of lithium ion battery technology
With the application in emerging key market (electric car field), the research and development upsurge in global range is excited, lithium ion battery will
Critical positions are occupied in electric car and new energy field.It is phosphorus using more lithium ion battery at present in electric car
Sour lithium iron battery, its thermal stability and safety is preferable, while price is relatively cheap.
In order to protect lithium ion battery, extends battery, give full play to cell potential, need accurately to estimate battery
State-of-charge (SOC), health status (SOH), power rating (SOP) etc..SOC is most of control strategies on electric car
Basis, still, battery parameter can be gradually changed with using, need by real-time online estimate battery SOH to control
Strategy carries out on-line amending.
In general, defining SOH in terms of power, energy two, for EV and PHEV, the energy content of battery determines travelable
Mileage, and the energy content of battery is defined by battery capacity, battery capacity is able to reflect the fully charged practical energy later of battery
The ampere-hour capacity enough stored, therefore can be used as an index of SOH.Battery capacity can decay with the aging of battery, state
It is inside and outside to have the much research in terms of battery capacity attenuation characteristic, but to realize vehicle-mounted online real-time estimation battery capacity,
An always difficult point.
Currently, mainly calculating battery appearance by being vented at a certain temperature with certain multiplying power to full charge battery
Amount, it is clear that this method is only suitable for off-line calculation, is not suitable for vehicle-mounted in line computation, is in addition completely filled to battery
Man Fanghui brings irreversible lesion to battery, therefore can only be estimated by other battery parameters.Have both at home and abroad very now
The methods for carrying out battery capacity estimation, most of method is inaccurate or is not suitable for estimation on line, and there are also some more
Method is based on battery service life model, these models cannot adaptively be adjusted according to actual motion environment, or is calculated
Amount is not suitable for greatly very much real-time online estimation.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of lithium ion battery of electric automobile capacity estimation on line method and dresses
It sets.
The technical solution of embodiment of the present invention is as follows:
A kind of lithium ion battery of electric automobile capacity estimation on line method, comprising:
The battery pack SOC that acquisition last time powers on the moment powers on the battery pack SOC at moment with this；
Calculate last time power on the moment battery pack SOC and this power on the changing value Δ between the battery pack SOC at moment
SOC；
The battery pack is obtained to power on constantly from last time to the accumulation ampere-hour capacity value Δ ah at moment electric under last time；
Will accumulation ampere-hour capacity value Δ ah divided by changing value Δ SOC's as a result, being determined as current battery capacity value.
In one embodiment, the battery pack that obtains powered on constantly from last time to the accumulation ampere-hour at moment electric under last time
Capability value Δ ah includes:
It acquires and powered on from last time constantly to the battery pack current value at moment electric under last time, wherein using the electric current of the first range
Sensor detection is greater than the battery pack current value of predetermined threshold, is less than or equal to using the current sensor detection of the second range pre-
The battery pack current value of threshold value is determined, wherein the first range is greater than the second range；
It powers on using from last time constantly to the collection value of the battery pack current value at moment electric under last time, it is true based on integral algorithm
It is fixed to power on constantly from last time to the accumulation ampere-hour capacity value Δ ah at moment electric under last time.
In one embodiment, described this battery pack SOC for powering on the moment of acquisition includes:
It obtains battery pack voltage that this powers on the moment and this powers on the battery temperature at moment；
Based on this power on the moment battery pack voltage and this power on the battery temperature at moment, table look-up and obtain on this
The battery pack SOC at electric moment.
In one embodiment, obtain this power on the moment battery pack voltage and this power on the battery at moment
Before temperature, this method further include:
The electric moment powered on the time difference at moment with this under calculating last time；
The battery pack temperature for calculating the electric moment under last time powers on the temperature gap of the battery pack temperature at moment with this；
When the time difference is greater than scheduled time difference threshold value and temperature gap is greater than scheduled temperature gap threshold value
When, determine electric time long enough under battery pack and execute described to obtain battery pack voltage that this powers on the moment and this is powered on
Otherwise the step of battery temperature at moment, determines under battery pack that the electric time long enough and does not exit this process.
In one embodiment, this method further include:
Tabling look-up described in verification, whether this of acquisition to power on the battery pack SOC at moment effective, wherein when this powers on the moment
Battery pack voltage effectively, this battery pack current for powering on the moment be less than scheduled current threshold and under last time the electric moment with
When this time difference for powering on the moment is greater than the time difference threshold value while meeting, this of determining acquisition of tabling look-up powers on the moment
Battery pack SOC it is effective, otherwise determining this of acquisition of tabling look-up, to power on the battery pack SOC at moment invalid.
A kind of lithium ion battery of electric automobile capacity estimation on line device, comprising:
SOC obtains module, and the battery pack SOC that the moment is powered on for obtaining last time powers on the battery pack SOC at moment with this；
Changing value computing module, the battery pack SOC that the moment is powered on for calculating last time power on the battery pack at moment with this
Changing value Δ SOC between SOC；
It accumulates ampere-hour capacity value and obtains module, powered on constantly from last time to the moment electric under last time for obtaining the battery pack
Accumulation ampere-hour capacity value Δ ah；
Capability value determining module, for will accumulate ampere-hour capacity value Δ ah divided by the changing value Δ SOC's as a result, determine
For current battery capacity value.
In one embodiment, accumulation ampere-hour capacity value obtains module, powers on constantly for acquiring from last time to last time
The battery pack current value at lower electricity moment, wherein being greater than the battery pack of predetermined threshold using the current sensor detection of the first range
Current value is less than or equal to the battery pack current value of predetermined threshold using the current sensor detection of the second range, wherein first
Range is greater than the second range；It powers on constantly using from last time to the collection value of the battery pack current value at moment electric under last time, is based on
Integral algorithm, which is determined, to be powered on constantly from last time to the accumulation ampere-hour capacity value Δ ah at moment electric under last time.
In one embodiment, SOC obtains module, for obtaining the battery pack voltage and this that this powers on the moment
Power on the battery temperature at moment；Based on this power on the moment battery pack voltage and this power on the battery temperature at moment, look into
Table obtains this battery pack SOC for powering on the moment.
In one embodiment, further includes:
Judgment module, for when SOC acquisition module obtains the battery pack voltage that this powers on the moment and this is powered on
Before the battery temperature at quarter, the electric moment powered on the time difference at moment with this under calculating last time, calculated the electricity at electric moment under last time
Pond packet temperature powers on the temperature gap of the battery pack temperature at moment with this, is greater than scheduled time difference thresholding when the time difference
Value and when temperature gap is greater than scheduled temperature gap threshold value, determines electric time long enough under battery pack and enables the SOC
Module is obtained, otherwise determines under battery pack that the electric time long enough and non-do not enable the SOC and obtains module.
In one embodiment, further includes:
Correction verification module, whether this for verifying the acquisition of tabling look-up powers on the battery pack SOC at moment effective, wherein when
This power on the moment battery pack voltage effectively, this power on the moment battery pack current be less than scheduled current threshold and on
When the time difference that the secondary lower electric moment powers on the moment with this meets simultaneously greater than the time difference threshold value, acquisition of tabling look-up is determined
The battery pack SOC that this powers on the moment is effective, and otherwise determining this of acquisition of tabling look-up, to power on the battery pack SOC at moment invalid.
In conclusion in embodiments of the present invention, the battery pack SOC that acquisition last time powers on the moment powers on the moment with this
Battery pack SOC；Calculate last time power on the moment battery pack SOC and this power on the changing value between the battery pack SOC at moment
ΔSOC；Battery pack is obtained to power on constantly from last time to the accumulation ampere-hour capacity value Δ ah at moment electric under last time；Accumulation ampere-hour is held
Magnitude Δ ah is divided by changing value Δ SOC's as a result, being determined as current battery capacity value.Embodiment of the present invention is compared to more traditional
Evaluation method has the advantages that precision is high, calculation amount is small, and suitable estimation on line not damaged to battery.
Detailed description of the invention
Only illustratively description and explain the present invention for the following drawings, not delimit the scope of the invention.
Fig. 1 is according to lithium ion battery of electric automobile capacity estimation on line flow chart of the present invention.
Fig. 2 is according to lithium ion battery of electric automobile volume calculation flow chart of the present invention.
Fig. 3 is the logi function chart according to present invention acquisition battery pack voltage.
Fig. 4 is to obtain SOC logi function chart according to battery pack voltage of the present invention.
Fig. 5 is to judge the whether effective logi function chart of SOC according to the present invention.
Fig. 6 is to judge whether battery condition meets battery capacity and calculate logi function chart according to the present invention.
Fig. 7 is to calculate logi function chart according to battery capacity of the present invention.
Fig. 8 is according to lithium ion battery of electric automobile capacity estimation on line structure drawing of device of the present invention.
Specific embodiment
In order to which the technical features, objects and effects of invention are more clearly understood, the Detailed description of the invention present invention is now compareed
Specific embodiment, identical label indicates identical part in the various figures.
It is succinct and intuitive in order to what is described, hereafter by describing several representative embodiments come to side of the invention
Case is illustrated.A large amount of details is only used for helping to understand the solution of the present invention in embodiment.However, it will be apparent that of the invention
Technical solution can be not limited to these details when realizing.In order to avoid unnecessarily having obscured the solution of the present invention, Yi Xieshi
It applies mode not described meticulously, but only gives frame.Hereinafter, " comprising " refers to " including but not limited to ", " root
According to ... " refer to " according at least to ..., but be not limited to according only to ... ".Due to the speech habits of Chinese, hereinafter without spy
When not pointing out the quantity of an ingredient, it is meant that the ingredient is either one or more, or can be regarded as at least one.
In the battery capacity estimation of the prior art, need at a certain temperature to put full charge battery with certain multiplying power
Sky calculates the situation of battery capacity, is only suitable for off-line calculation and can bring irreversible lesion to battery.Moreover, based on electricity
The method of pond life model then cannot adaptively be adjusted according to actual motion environment or calculation amount is not suitable for greatly very much
Real-time online estimation.
Embodiment of the present invention proposes a kind of capacity of lithium ion battery estimation on line methods for electric vehicle.
Fig. 1 is according to lithium ion battery of electric automobile capacity estimation on line flow chart of the present invention.
As shown in Figure 1, this method comprises:
Step 10: the battery pack SOC that acquisition last time powers on the moment powers on the battery pack SOC at moment with this.
Step 20: calculate last time power on the moment battery pack SOC and this power on the variation between the battery pack SOC at moment
It is worth Δ SOC.
Step 30: obtaining battery pack and powered on constantly from last time to the accumulation ampere-hour capacity value Δ ah at moment electric under last time.
Step 40: will accumulation ampere-hour capacity value Δ ah divided by changing value Δ SOC's as a result, being determined as current battery capacity
Value.
Wherein, battery pack is obtained in step 30 to power on constantly from last time to the accumulation ampere-hour capacity value Δ at moment electric under last time
Ah includes: that acquisition was powered on from last time constantly to the battery pack current value at moment electric under last time, wherein using the electric current of the first range
Sensor detection is greater than the battery pack current value of predetermined threshold, is less than or equal to using the current sensor detection of the second range pre-
The battery pack current value of threshold value is determined, wherein the first range is greater than the second range；It powers on constantly using from last time to electricity under last time
The collection value of the battery pack current value at moment was determined from last time based on integral algorithm and is powered on constantly to the accumulation at moment electric under last time
Ampere-hour capacity value Δ ah.
In one embodiment, it includes: to obtain this to power on that the battery pack SOC that this powers on the moment is obtained in step 10
The battery pack voltage at moment and this power on the battery temperature at moment；The battery pack voltage and sheet at moment are powered on based on this
The secondary battery temperature for powering on the moment tables look-up and obtains this battery pack SOC for powering on the moment.
In one embodiment, obtain this power on the moment battery pack voltage and this power on the battery at moment
Before temperature, this method further include: the electric moment powered on the time difference at moment with this under calculating last time；Calculate the electric moment under last time
Battery pack temperature the temperature gap of the battery pack temperature at moment is powered on this；It is greater than the scheduled time difference when the time difference
When threshold value and temperature gap are greater than scheduled temperature gap threshold value, electric time long enough under battery pack is determined and described in executing
Battery pack voltage that this powers on the moment and this step of powering on the battery temperature at moment are obtained, is otherwise determined under battery pack
The electric time long enough and does not exit this process.
In one embodiment, this method further include: table look-up this battery pack SOC for powering on the moment of acquisition of verification is
It is no effectively, wherein when this power on the moment battery pack voltage effectively, this power on the moment battery pack current be less than it is scheduled
Current threshold and when electric moment and this time difference for powering on the moment meet simultaneously greater than the time difference threshold value under last time,
This for determining acquisition of tabling look-up powers on that the battery pack SOC at moment is effective, this for otherwise determining acquisition of tabling look-up powers on the electricity at moment
It is invalid that SOC is wrapped in pond.
As it can be seen that embodiment of the present invention proposes a kind of capacity of lithium ion battery estimation on line methods for electric vehicle, including
The following contents: acquisition last time powers on moment battery pack SOC, obtains this and powers on moment battery pack SOC, finds out in battery pack twice
SOC changing value Δ SOC during electricity；Obtain from last time battery pack power on to last time battery pack under accumulation ampere-hour capacity value during electricity
Δah；By accumulation ampere-hour capacity value Δ ah divided by SOC changing value Δ SOC, present battery capability value Q=Δ ah/ Δ is found out
SOC。
Preferably, need to judge under battery pack the electric time whether long enough.Wherein, when the electric time passes through real-time under battery pack
Clock and the battery pack electric moment under last time power on moment temperature change value Δ T to this and carry out joint judgement.Preferably, using double
Range current sensor obtains accumulation ampere-hour capacity, and wherein high range current sensor is for acquiring high current, lower range electric current
Sensor is for acquiring low current, to guarantee the estimation precision of battery capacity.In addition, by powering on the OCV acquired constantly and temperature
Angle value, which is tabled look-up, obtains SOC value, while needing to judge whether the SOC obtained is effective, and the battery pack voltage only obtained is effective, battery pack
Electric current is less than certain value, these three conditions of downtime long enough meet simultaneously, and the SOC obtained at this time is only effectively.
Preferably, it is also necessary to judge the validity of the battery capacity calculated.Only have when last time powers on the SOC estimated constantly
Effect, this power on the SOC changed during the SOC that estimates constantly effectively, is twice powered on be in it is certain within the scope of, power on twice
Period accumulation ampere-hour capacity be in it is certain within the scope of, electric these conditions of time long enough while when meeting under battery pack, count
The battery capacity calculated is only effectively.
As it can be seen that the invention discloses a kind of electric cars to solve the deficiency of existing capacity of lithium ion battery evaluation method
With capacity of lithium ion battery estimation on line method, can overcome traditional evaluation method precision it is inadequate, it is computationally intensive, battery is damaged
The shortcomings that wound, unsuitable estimation on line.
The present invention powers on the accumulative ampere-hour capacity Δ ah of period by obtaining battery pack twice, and battery pack powers on the moment twice
SOC, worked as by adding up ampere-hour capacity Δ ah between powering on twice divided by powering on period SOC changing value Δ SOC twice and calculate
Preceding battery capacity Q=Δ ah/ Δ SOC.
Embodiment of the present invention further include judge under battery pack the electric time whether long enough, only battery pack quiescent time foot
Enough long, battery is likely to reach equilibrium state, and the battery pack voltage of acquisition just can be approximately OCV, be tabled look-up by battery pack voltage
Obtained SOC could react true SOC, and the electricity under last time to this will power on electricity by real-time clock and battery pack the lower electricity time
The pond temperature difference carries out joint judgement.
Embodiment of the present invention further includes the battery pack voltage for acquiring high-voltage relay closure previous moment, and by adopting
The battery pack voltage and temperature of collection, which are tabled look-up, obtains the method that battery pack powers on moment SOC.Embodiment of the present invention further includes judgement
Current time SOC is if appropriate for the calculating for battery capacity.Embodiment of the present invention further includes judging current time battery shape
Whether state can be used in the calculating of battery capacity, and specific battery capacity calculates process.
Embodiment of the present invention is described in detail below.
Firstly, declaring parameter and its meaning.
Wherein: Δ ah is accumulation ampere-hour capacity value (power on from last time battery pack to last time battery pack and power on)；Ah_max is
Ampere-hour capacity upper threshold；Ah_min is ampere-hour capacity lower threshold；Ah_flag is effective marker position under accumulation ampere-hour capacity；Q
For battery capacity；Δ SOC is SOC changing value (power on from last time battery pack to this battery pack and power on)；SOC_min is SOC change
Change lower threshold；SOC_max is that SOC changes upper threshold；DeltaSOC_flag is Δ SOC effective marker position；Δ T is battery
Packet electricity under last time to this powers on temperature difference；Δ t is that battery pack electricity under last time is poor to this power-on time；time_flag
For time long enough flag bit electric under battery pack；Main_state_flag is main relay status flag bit；voltage_flag
To power on moment battery pack voltage flag position；Current_flag is to power on moment electric current effective marker position (being less than 2A)；SOC_
Flag is SOC effective marker；SOC_flag1 is last time to power on SOC effective marker；SOC_flag2, which powers on SOC for this, criterion
Will；Capacity_flag is that battery capacity calculates effective marker；Time_min is time gate limit value；Temp_min is temperature difference door
Limit value.
Fig. 2 is according to lithium ion battery of electric automobile volume calculation flow chart of the present invention；Fig. 3 is according to present invention acquisition electricity
The logi function chart of pond packet voltage；Fig. 4 is to obtain SOC logi function chart according to battery pack voltage of the present invention；Fig. 5 is according to this hair
It is bright to judge the whether effective logi function chart of SOC；Fig. 6 is to judge whether battery condition meets battery capacity calculating and patrol according to the present invention
Collect functional diagram；Fig. 7 is to calculate logi function chart according to battery capacity of the present invention.
Process description shown in Fig. 2 by battery pack twice powers on period SOC changing value Δ SOC, and powers on the phase twice
Between add up ampere-hour capacity value Δ ah calculate battery capacity detailed process.Algorithm is since step 101, in a step 102 from depositing
Electric moment battery temperature is read under historical data, including last time in reservoir, last time powers on moment battery pack SOC, powered on from last time
Accumulative ampere-hour capacity value Δ ah under to last time during electricity, in order to ensure accumulate ampere-hour capacity precision, system using two not
With range current sensor measurement battery pack current, high range is for acquiring high current, and lower range is for acquiring low current.
In process shown in Fig. 2, judge whether high-voltage relay is closed in step 103, once high-voltage relay
Closure, judge under battery pack at step 104 the electric time whether long enough, while setting time mark time_flag, wherein can
To pass through the battery temperature of real-time clock log recorded from electricity under last time battery pack to this battery pack power-on time difference Δ t, BMS
Poor Δ T is judged that if time difference Δ t is more than threshold value time_min, while temperature difference T is more than threshold T emp_min,
Then think for time long enough electric under battery pack, while setting time indicates time_flag, indicates that this powers on the battery of acquisition
Packet voltage, which can be used for tabling look-up, obtains SOC, for calculating present battery capacity.
After high-voltage relay closure, moment battery pack voltage is powered in step 105 acquisition.
Logic diagram shown in Fig. 3 illustrates the process for obtaining battery pack voltage, when main relay closes in block diagram 201
It closes, by set main relay state flag bit main_state_flag, block diagram 202 is constant 1, and block diagram 205 is constant 0, block diagram
204, block diagram 208, block diagram 211 are unit delay, and block diagram 203, block diagram 206, block diagram 207 are logical AND operation, and block diagram 209 is to take
Inverse operations, block diagram 210 are the battery pack voltage of acquisition, and block diagram 212 is the battery pack voltage after unit delay, and block diagram 213 is to adopt
Collection powers on moment battery pack voltage, when the output of block diagram 207 is 1, after the activation acquisition of block diagram 212 is delayed by 211 unit of block diagram
Battery pack voltage, while set voltage mark voltage_flag finally powers on moment battery pack voltage and provides online 213
On.
If the time tag time_flag in the step 104 of process shown in Fig. 2 has with battery pack voltage in step 105
Valid flag voltage_flag is 1, is tabled look-up by battery pack voltage and battery temperature value obtain current time in step 107
SOC value, wherein the tables of data of different temperatures voltage and SOC can be obtained by off-line test.
Process 300 shown in Fig. 4 illustrates the detailed process that SOC is obtained according to battery pack voltage and battery temperature.Block diagram 301
For battery temperature, block diagram 302 is to power on moment battery pack voltage, is looked into block diagram 303 according to battery temperature and battery pack voltage
Table obtains SOC value, and last SOC is provided on line 304.
In order to ensure the accuracy and robustness of battery capacity estimation, need to carry out SOC validity to judge to flow in Fig. 5
Journey 400 is SOC Effective judgement process.Its Block Diagrams 401 is battery pack voltage effective marker voltage_flag, block diagram 402
To power on moment battery pack operating current, block diagram 403 is to power on moment battery pack current upper limit threshold, is judged in block diagram 405
Power on whether moment battery pack current is less than threshold value 2A, if it is less than then set current state effective marker current_flag,
Block diagram 404 is electric time tag time_flag under battery pack, carries out logical AND operation to three effective markers in block diagram 406, only
There are three effective markers to set 1 ability set SOC effective marker SOC_flag simultaneously, and provides on online 407.
Judge whether the condition for calculating battery capacity all meets in the step 108 of Fig. 2, in detailed process such as Fig. 6
Shown in process 500.Its Block Diagrams 501 is the SOC effective marker SOC_flag1 for last time powering on the moment, and block diagram 502 powers on for this
The SOC effective marker SOC_flag2 at moment, block diagram 504 are to accumulate ampere-hour capacity value Δ ah during powering on last time, and block diagram 505 is
It takes absolute value to accumulation ampere-hour capacity value, judges whether Δ ah is less than the ampere-hour capacity upper threshold of block diagram 503 in block diagram 507
Ah_max, greater than the ampere-hour capacity lower threshold ah_min of block diagram 506, set accumulation ampere-hour capacity is effective if meeting simultaneously
Flag bit ah_flag.Block diagram 508 is the SOC for last time powering on the moment, and block diagram 509 is that this powers on the SOC at moment, in block diagram 510
In find out SOC changing value Δ SOC twice, taken absolute value by block diagram 512 to Δ SOC, Δ SOC judged in block diagram 514 whether
Less than the SOC upper threshold SOC_max of block diagram 511, greater than the SOC lower threshold SOC_min of block diagram 513, if met simultaneously
Then set Δ SOC effective marker position deltaSOC_flag.Block diagram 515 is electric time effective marker position time_ under battery pack
Flag,
Battery capacity is calculated in the step 110 of Fig. 2, if the above mark is all effective, is carried out by block diagram 516
After logical AND operation, the battery capacity of set block diagram 517 calculates effective marker position capacity_flag, while activating block diagram
521 calculate present battery capability value, and Block Diagrams 518 are ampere-hour capacity changing value Δ ah during powering on twice, and block diagram 519 is upper
Secondary to power on moment SOC, block diagram 520 is that this powers on moment SOC, and block diagram 522 is the actual battery capability value of estimation, specific to calculate
Process is as shown in the process 600 of Fig. 7, and Block Diagrams 601 are ampere-hour capacity value Δ ah, and block diagram 602 is to power on moment SOC last time,
Block diagram 603 is that this powers on moment SOC, finds out SOC changing value Δ SOC by block diagram 604, calculates battery in block diagram 605
Capacity Q=Δ ah/ Δ SOC, and be output on lines 606.
Once battery capacity is calculated as function, the battery capacity value newly calculated is stored to non-in the step 111 of Fig. 2
It is all effective if not all conditions for calculating battery capacity in volatile memory, then when this being powered in step 109
It carves battery parameter storage to calculate for next battery capacity in the nonvolatile memory, algorithm terminates in step 112.In step
In rapid 115, after main relay closure, while battery temperature, battery pack current are obtained in step 106, for judging up and down
Whether the battery temperature difference is more than certain door threshold value, and whether battery pack operating current is less than certain door threshold value.
The invention also provides lithium ion battery of electric automobile capacity estimation on line devices.
Fig. 8 is according to lithium ion battery of electric automobile capacity estimation on line structure drawing of device of the present invention.
As shown in figure 8, lithium ion battery of electric automobile capacity estimation on line device, comprising:
SOC obtains module 801, and the battery pack SOC that the moment is powered on for obtaining last time powers on the battery pack at moment with this
SOC；
Changing value computing module 802, the battery pack SOC that the moment is powered on for calculating last time power on the battery at moment with this
Wrap the changing value Δ SOC between SOC；
It accumulates ampere-hour capacity value and obtains module 803, powered on constantly from last time to electricity under last time for obtaining the battery pack
The accumulation ampere-hour capacity value Δ ah at moment；
Capability value determining module 804, for will accumulate ampere-hour capacity value Δ ah divided by the changing value Δ SOC's as a result,
It is determined as current battery capacity value.
In one embodiment, accumulation ampere-hour capacity value obtain module 803, for acquire from last time power on constantly to
The battery pack current value at secondary lower electric moment, wherein being greater than the battery of predetermined threshold using the current sensor detection of the first range
Packet current value is less than or equal to the battery pack current value of predetermined threshold using the current sensor detection of the second range, wherein the
One range is greater than the second range；It powers on constantly using from last time to the collection value of the battery pack current value at moment electric under last time, base
It determined in integral algorithm from last time and powers on constantly to the accumulation ampere-hour capacity value Δ ah at moment electric under last time.
In one embodiment, SOC obtains module 801, for obtain battery pack voltage that this powers on the moment and
This powers on the battery temperature at moment；Based on this power on the moment battery pack voltage and this power on the battery temperature at moment
Degree, tables look-up and obtains this battery pack SOC for powering on the moment.
In one embodiment, further includes:
Judgment module, for when SOC acquisition module obtains the battery pack voltage that this powers on the moment and this is powered on
Before the battery temperature at quarter, the electric moment powered on the time difference at moment with this under calculating last time, calculated the electricity at electric moment under last time
Pond packet temperature powers on the temperature gap of the battery pack temperature at moment with this, is greater than scheduled time difference thresholding when the time difference
Value and when temperature gap is greater than scheduled temperature gap threshold value, determines electric time long enough under battery pack and enables the SOC
Module is obtained, otherwise determines under battery pack that the electric time long enough and non-do not enable the SOC and obtains module.
In one embodiment, further includes:
Correction verification module, whether this for verifying the acquisition of tabling look-up powers on the battery pack SOC at moment effective, wherein when
This power on the moment battery pack voltage effectively, this power on the moment battery pack current be less than scheduled current threshold and on
When the time difference that the secondary lower electric moment powers on the moment with this meets simultaneously greater than the time difference threshold value, acquisition of tabling look-up is determined
The battery pack SOC that this powers on the moment is effective, and otherwise determining this of acquisition of tabling look-up, to power on the battery pack SOC at moment invalid.
As it can be seen that embodiment of the present invention powers on period SOC changing value Δ SOC by obtaining battery pack twice, ampere-hour is accumulated
Capacity Δ ah, real-time online calculate battery capacity Q=Δ ah/ Δ SOC, overcome existing by a certain temperature with certain times
Rate is vented full charge battery to calculate battery capacity, is only suitable for off-line calculation, and irreversible damage can be brought to battery
Harmful disadvantage, the method based on battery service life model cannot adaptively be adjusted or calculation amount according to actual motion environment
Not the shortcomings that not being suitable for very much real-time online estimation greatly.
It should be noted that step and module not all in above-mentioned each process and each structure chart be all it is necessary, can
To ignore certain steps or module according to the actual needs.Each step execution sequence be not it is fixed, can according to need into
Row adjustment.The division of each module is intended merely to facilitate the division functionally that description uses, and in actual implementation, a module can
It is realized with point by multiple modules, the function of multiple modules can also be realized by the same module, these modules can be located at same
In a equipment, it can also be located in different equipment.
Hardware module in each embodiment mechanically or can be realized electronically.For example, a hardware module
It may include that the permanent circuit specially designed or logical device (such as application specific processor, such as FPGA or ASIC) are specific for completing
Operation.Hardware module also may include programmable logic device or circuit by software provisional configuration (as included general procedure
Device or other programmable processors) for executing specific operation.Mechanical system is used as specific, or using dedicated permanent
Property circuit, or hardware module is realized using the circuit (such as being configured by software) of provisional configuration, can according to cost and
Temporal consideration is to determine.
The present invention also provides a kind of machine readable storage medium, storage is for making a machine execute side as described herein
The instruction of method.Specifically, system or device equipped with storage medium can be provided, store in realization on the storage medium
State the software program code of the function of any embodiment in embodiment, and make the system or device computer (or CPU or
MPU the program code being stored in a storage medium) is read and executed.Further, it is also possible to be made by the instruction based on program code
Operating system of hands- operation etc. is calculated to complete partly or completely practical operation.It can also will read from storage medium
The expansion being connected to a computer is write in memory set in the expansion board in insertion computer or write to program code
In the memory being arranged in exhibition unit, then the instruction based on program code makes to be mounted on expansion board or expanding element
CPU etc. comes execution part and whole practical operations, to realize the function of any embodiment in above embodiment.
Storage medium embodiment for providing program code include floppy disk, hard disk, magneto-optic disk, CD (such as CD-ROM,
CD-R, CD-RW, DVD-ROM, DVD-RAM, DVD-RW, DVD+RW), tape, non-volatile memory card and ROM.Selectively,
It can be by communication network from download program code on server computer or cloud.
It should be noted that step and module not all in above-mentioned each process and each system construction drawing is all necessary
, certain steps or module can be ignored according to the actual needs.Each step execution sequence be not it is fixed, can be according to need
It is adjusted.System structure described in the various embodiments described above can be physical structure, be also possible to logical construction, that is, have
A little modules may be realized by same physical entity, be realized alternatively, some modules may divide by multiple physical entities, alternatively, can be with
It is realized jointly by certain components in multiple autonomous devices.
In the above various embodiments, hardware cell mechanically or can be realized electrically.For example, a hardware list
Member may include permanent dedicated circuit or logic (such as special processor, FPGA or ASIC) to complete corresponding operating.Firmly
Part unit can also include programmable logic or circuit (such as general processor or other programmable processors), can by software into
The interim setting of row is to complete corresponding operating.Concrete implementation mode (mechanical system or dedicated permanent circuit or is faced
When the circuit that is arranged) can be determined based on cost and temporal consideration.
Detailed displaying and explanation carried out to the present invention above by attached drawing and preferred embodiment, however the present invention is not limited to
These embodiments having revealed that, base could be aware that with above-mentioned multiple embodiment those skilled in the art, can combine above-mentioned difference
Means in embodiment obtain the more embodiments of the present invention, these embodiments are also within protection scope of the present invention.
Claims (10)
1. a kind of lithium ion battery of electric automobile capacity estimation on line method characterized by comprising
The battery pack state-of-charge SOC that acquisition last time powers on the moment powers on the battery pack SOC at moment with this；
Calculate last time power on the moment battery pack SOC and this power on the changing value Δ SOC between the battery pack SOC at moment；
The battery pack is obtained to power on constantly from last time to the accumulation ampere-hour capacity value Δ ah at moment electric under last time；
Will accumulation ampere-hour capacity value Δ ah divided by changing value Δ SOC's as a result, being determined as current battery capacity value.
2. lithium ion battery of electric automobile capacity estimation on line method according to claim 1, which is characterized in that described to obtain
It takes battery pack to power on from last time to include: to the accumulation ampere-hour capacity value Δ ah at moment electric under last time constantly
It acquires and powered on from last time constantly to the battery pack current value at moment electric under last time, wherein using the current sense of the first range
Device detection is greater than the battery pack current value of predetermined threshold, is less than or equal to predetermined door using the current sensor detection of the second range
The battery pack current value of limit value, wherein the first range is greater than the second range；
Power on constantly using from last time to the collection value of the battery pack current value at moment electric under last time, based on integral algorithm determination from
Last time powers on constantly to the accumulation ampere-hour capacity value Δ ah at moment electric under last time.
3. lithium ion battery of electric automobile capacity estimation on line method according to claim 1, which is characterized in that described to obtain
The battery pack SOC for taking this to power on the moment includes:
It obtains battery pack voltage that this powers on the moment and this powers on the battery temperature at moment；
Based on this power on the moment battery pack voltage and this power on the battery temperature at moment, table look-up when obtaining this and powering on
The battery pack SOC at quarter.
4. lithium ion battery of electric automobile capacity estimation on line method according to claim 3, which is characterized in that obtaining
Before this powers on the battery pack voltage and this battery temperature for powering on the moment at moment, this method further include:
The electric moment powered on the time difference at moment with this under calculating last time；
The battery pack temperature for calculating the electric moment under last time powers on the temperature gap of the battery pack temperature at moment with this；
When the time difference is greater than scheduled time difference threshold value and temperature gap is greater than scheduled temperature gap threshold value, sentence
Determine under battery pack electric time long enough and execute described to obtain battery pack voltage that this powers on the moment and this powers on the moment
Battery temperature the step of, otherwise determine under battery pack that the electric time long enough and does not exit this process.
5. lithium ion battery of electric automobile capacity estimation on line method according to claim 4, which is characterized in that this method
Further include:
This of acquisition of tabling look-up described in verification powers on whether the battery pack SOC at moment is effective, wherein the electricity for powering on the moment when this
Pond packet voltage effectively, this battery pack current for powering on the moment be less than scheduled current threshold and under last time the electric moment and this
The time difference at moment is powered on greater than the time difference threshold value while when meeting, this of determining acquisition of tabling look-up powers on the electricity at moment
Pond wraps that SOC is effective, and otherwise determining this of acquisition of tabling look-up, to power on the battery pack SOC at moment invalid.
6. a kind of lithium ion battery of electric automobile capacity estimation on line device characterized by comprising
SOC obtains module, and the battery pack SOC that the moment is powered on for obtaining last time powers on the battery pack SOC at moment with this；
Changing value computing module, for calculate last time power on the moment battery pack SOC and this power on the moment battery pack SOC it
Between changing value Δ SOC；
It accumulates ampere-hour capacity value and obtains module, powered on tiring out to the moment electric under last time constantly from last time for obtaining the battery pack
Product ampere-hour capacity value Δ ah；
Capability value determining module, for ampere-hour capacity value Δ ah will to be accumulated divided by changing value Δ SOC's as a result, being determined as working as
Preceding battery capacity value.
7. lithium ion battery of electric automobile capacity estimation on line device according to claim 6, which is characterized in that
It accumulates ampere-hour capacity value and obtains module, power on constantly for acquiring from last time to the battery pack current at moment electric under last time
Value, wherein being greater than the battery pack current value of predetermined threshold using the current sensor detection of the first range, using the second range
Current sensor detection be less than or equal to predetermined threshold battery pack current value, wherein the first range be greater than the second range；Benefit
It is powered on constantly with from last time to the collection value of the battery pack current value at moment electric under last time, was determined from last time based on integral algorithm
The accumulation ampere-hour capacity value Δ ah at electric moment under the electric moment to last time.
8. lithium ion battery of electric automobile capacity estimation on line device according to claim 6, which is characterized in that
SOC obtains module, for obtaining battery pack voltage that this powers on the moment and this powers on the battery temperature at moment；Base
In this power on the moment battery pack voltage and this power on the battery temperature at moment, table look-up and obtain this electricity for powering on the moment
Wrap SOC in pond.
9. lithium ion battery of electric automobile capacity estimation on line device according to claim 8, which is characterized in that also wrap
It includes:
Judgment module, for obtaining in SOC, module obtains battery pack voltage that this powers on the moment and this powers on the moment
Before battery temperature, the electric moment powered on the time difference at moment with this under calculating last time, calculated the battery pack at electric moment under last time
Temperature powers on the temperature gap of the battery pack temperature at moment with this, when the time difference be greater than scheduled time difference threshold value and
When temperature gap is greater than scheduled temperature gap threshold value, determines electric time long enough under battery pack and enable the SOC acquisition
Otherwise module determines under battery pack that the electric time long enough and non-do not enable the SOC and obtains module.
10. lithium ion battery of electric automobile capacity estimation on line device according to claim 9, which is characterized in that also wrap
It includes:
Correction verification module, whether this for verifying the acquisition of tabling look-up powers on the battery pack SOC at moment effective, wherein when this
Power on the battery pack voltage at moment effectively, this battery pack current for powering on the moment be less than scheduled current threshold and under last time
When the time difference that the electric moment powers on the moment with this meets simultaneously greater than the time difference threshold value, this for acquisition of tabling look-up is determined
The battery pack SOC for powering on the moment is effective, and otherwise determining this of acquisition of tabling look-up, to power on the battery pack SOC at moment invalid.
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