CN104280686B - Storage battery residual electric quantity detection method - Google Patents
Storage battery residual electric quantity detection method Download PDFInfo
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- CN104280686B CN104280686B CN201410539126.6A CN201410539126A CN104280686B CN 104280686 B CN104280686 B CN 104280686B CN 201410539126 A CN201410539126 A CN 201410539126A CN 104280686 B CN104280686 B CN 104280686B
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Abstract
The invention discloses a storage battery residual electric quantity detection method. The method comprises the following steps (1) conducting initializing; (2) judging whether a storage battery is in a charging state or a discharging state currently, conducting charging state electric quantity detection if the storage battery is in the charging state, and conducting discharging state electric quantity detection if the storage battery is in the discharging state; (3) dynamically setting the sampling frequency, and executing the step (2) again. According to the storage battery residual electric quantity detection method, on the premise that the hardware cost is not increased, the storage battery electric quantity detection result becomes quite accurate, the problem that a user of charging equipment cannot accurately know the equipment residual electric quantity is solved, the capacity of automatically correcting an accumulated error in the using process is achieved, the storage battery residual electric quantity detection method can automatically adapt to the influences of storage battery aging and environment temperature changes on the electricity storage capacity and the discharging capacity of the storage battery, the working frequency can be automatically adjusted so as to adapt to the changing working condition of the storage battery, frequency conversion sampling is achieved, and the storage battery residual electric quantity detection method can be widely applied to charging equipment for a smart phone, a tablet personal computer, a portable computer, an electric car and the like.
Description
Technical field
The present invention relates to a kind of analog quantity detecting method, particularly to a kind of battery residual capacity measurement method.
Background technology
Between the pole plate of analog quantity acquiring device acquisition battery voltage is usually used in charging equipment, by the remaining electricity of battery
The mapping relations of voltage between amount percentage and accumulator plate, obtain battery dump energy percentage indirectly.
However, as shown in figure 1, voltage between the pole plate of battery dump energy percentage and battery, in functional image
Often only assume approximate linear correlation in stage casing, but when electricity is relatively low or higher, between the pole plate of battery, voltage is with storage
The reduction of battery dump energy percentage and rapid decrease.This causes charging equipment just fully charged or when dump energy is relatively low,
Shown dump energy percentages rapid decrease in charging equipment, allows user cannot hold charging equipment exactly
Dump energy.
Some charging equipment, on the basis of above battery dump energy method for detecting percentage, to battery
Between dump energy percentage and accumulator plate, the mapping relations of voltage are modified so as to accumulator electric-quantity is relatively low and electricity
When higher, between accumulator plate, voltage can more accurately be mapped to battery dump energy percentage, makes charging equipment
Dump energy percentages show more accurate.But when the operation power of charging equipment increases suddenly, due to battery
The presence of polarizing polar plates phenomenon, between accumulator plate, voltage is decreased obviously so that the remaining electricity of the battery that detects of charging equipment
Amount percentage is substantially low.This makes charging equipment when electricity is relatively low, once abruptly entering the working condition of relatively high power, will
It is mistakenly considered accumulator electric-quantity at once too low, cause charging equipment automatic shutdown singularly.
When a charging equipment dump energy is more, tend not to automatically close after abruptly entering relatively high power working condition
Machine, but the dump energy percentages shown by charging equipment can reduce rapidly.However, when charging equipment turns again to relatively
After low power working condition, because accumulator plate degree of polarization weakens, voltage recovery between accumulator plate, battery remains
Remaining electric power detection result occurs rise, causes the mistake of the dump energy percentages resilience that charging equipment shows.
No matter above any battery residual capacity measurement method, all using voltage between by accumulator plate between obtain
The method taking battery dump energy percentage.But due to voltage between battery dump energy percentage and accumulator plate
Nonlinear correlation, and the presence of accumulator plate polarization phenomena, by accumulator plate between voltage, indirect gain battery remain
The method of remaining electricity percentage is it is impossible to be accurately detected the dump energy percentage of battery.
Content of the invention
It is an object of the invention to overcoming the deficiencies in the prior art to cause user cannot accurate assurance charging set
The problem of standby dump energy, provides a kind of testing result very accurate, can avoid the dump energy hundred shown by charging equipment
Divide ratio numerical value resilience mistake, electricity-saving characteristic can be taken into account while ensureing dump energy percentage testing result accuracy
Battery residual capacity measurement method.
The purpose of the present invention is achieved through the following technical solutions：A kind of battery residual capacity measurement method, bag
Include following steps：
S1：Initialization, carries out Initialize installation to the parameter needing to use；
S2：Judging that battery is currently at charged state or discharge condition, if being in charged state, carrying out step
S3, if being in discharge condition, carries out step S4；
S3：It is charged state electric power detection；
S4：Carry out discharge condition electric power detection；
S5：Dynamic setting sample frequency, return to step S2.
Further, the initialization of described step S1 includes following sub-step：
S11：If battery current residual electricity percentage is q, q accounts for the maximum electricity of battery for battery current residual electricity
The percentage of amount, as final detection variable；
S12：If battery current residual electricity is Q, and initializes Q, make Q=0；
S13：If battery maximum electricity is Qmax；
S14：If the charged state sampling period is Ti, the discharge condition sampling period is To；
S15：If the battery tension upper limit is Umax, battery tension lower limit is Umin；
S16：If electrical power number sequence W, its item number upper limit is N；
S17：If battery charge/discharge status indicator is that (its value is to represent charged state when 0 to Flag, and its value is to represent when 1
Discharge condition).
Further, there are three kinds of states, respectively charged state, discharge condition and spare time in theory in described battery
Configuration state, the idle state of battery is considered as the special discharge condition that a kind of discharge current in discharge condition is 0, therefore electric power storage
Pond only has charging and discharging two states, either-or.
Further, it is charged state electric power detection in described step S3 and include following sub-step：
S31：Judge whether Flag is equal to 1, if Flag==1, make Flag=0 and empty number sequence W；
S32：Obtain charging current value Ii；
S33：Q is made to add up Ii*Ti, i.e. Q=Q+Ii*Ti；
S34：Obtain charging voltage value Ui；
S35：Make q=f (Ui), wherein f (Ui) for battery dump energy percentage with regard to accumulator plate between voltage letter
Numerical value；
S36：Judge UiWhether it is equal to UmaxIf, Ui==UmaxThen make Qmax=Q；
S37：Wait charged state sampling period Ti；
S38：By UiWith IiProduct be added in number sequence W.
Further, in described step S4, discharge condition electric power detection includes following sub-step：
S41：Judge whether Flag is equal to 0, if Flag==0, make Flag=1 and empty number sequence W；
S42：Obtain discharge current Io；
S43：Judge IoWhether it is less than C*QmaxIf, Io<C*QmaxThen obtain discharge voltage value Uo；Otherwise make Q regressive Io*To,
I.e. Q=Q-Io*To, then carry out the operation of step S46；
S44：Judge UoWhether it is equal to UminIf, Uo==Umin, then make Q=0 and q=0, then carry out the behaviour of step S47
Make；
S45：Judge q whether more than battery dump energy percentage with regard to accumulator plate between voltage functional value f
(Uo), if q>f(Uo), then make q=f (Uo) and Q=q*Qmax, then carry out the operation of step S47, otherwise directly carry out step
The operation of S47；
S46：Judge Q/QmaxWhether it is less than q, if Q/Qmax<Q then makes q=Q/Qmax；
S47：Wait discharge condition sampling period To；
S48：By UoWith IoProduct be added in number sequence W.
Further, in described S5, dynamic setting sample frequency comprises the following steps：
S51：Calculate standard deviation α of number sequence W；
S52：Judge whether Flag is equal to 0, if Flag==0, carry out step S53, otherwise carry out step S54；
S53：Make TiEqual to the charged state sampling period with regard to several W standard deviations α functional value Tin(α)；
S54：Make ToEqual to the discharge condition sampling period with regard to number sequence W standard deviation α functional value Tout(α).
The invention has the beneficial effects as follows：
1st, on the premise of not increasing hardware cost, make the electric power detection result of battery become very accurate, solve
The user of charging equipment cannot accurate assurance equipment dump energy problem, simultaneously the detection method of the present invention can also avoid
When accumulator load is larger, exhaust and automatic shutdown singularly because accumulator plate polarization makes charging equipment take for electricity
Phenomenon, more avoids the mistake of the dump energy percentages resilience shown by charging equipment；
2nd, the detection method of the present invention has the ability that cumulative errors are calibrated automatically in use, can automatically adapt to
Battery is aging and the impact to battery power storage ability and discharge capability for the variation of ambient temperature, being capable of adjust automatically work frequency
Rate, to adapt to the working condition of battery change it is achieved that frequency-change sampling, and then is ensureing the inspection of battery dump energy percentage
On the premise of surveying result accuracy, take into account the electricity-saving characteristic of method；
3rd, it is generally applicable to all kinds, the charging equipment of various model, on the premise of not increasing hardware cost, with pure
Pure software algorithm achieves the accurate detection function of charging equipment internal battery dump energy, is not limited by operating system
System, can be widely used in the charging equipments such as smart mobile phone, panel computer, portable computer, electric automobile.
Brief description
Fig. 1 is voltage relationship figure between one piece of lithium ion battery dump energy percentage and pole plate；
Fig. 2 is the detection method flow chart of the present invention；
Fig. 3 is the flow chart of initialization step in the detection method of the present invention；
Fig. 4 is the flow chart of charged state electric power detection step in the detection method of the present invention；
Fig. 5 is the flow chart of discharge condition electric power detection step in the detection method of the present invention；
Fig. 6 is the flow chart arranging sample frequency step dynamic in the detection method of the present invention.
Specific embodiment
Further illustrate technical scheme below in conjunction with the accompanying drawings, but the content protected of the present invention be not limited to
Lower described.
As shown in Fig. 2 a kind of battery residual capacity measurement method, comprise the following steps：
S1：Initialization, carries out Initialize installation to the parameter needing to use；
S2：Judging that battery is currently at charged state or discharge condition, if being in charged state, carrying out step
S3, if being in discharge condition, carries out step S4；
S3：It is charged state electric power detection；
S4：Carry out discharge condition electric power detection；
S5：Dynamic setting sample frequency, return to step S2.
When battery residual capacity measurement starts execution, first the parameters needing in method to use are defined
And initial assignment, next the loop structure of formal access method, obtains battery dump energy percentage in real time, and then realizes
Accurate detection to charging equipment internal battery dump energy percentage, as shown in figure 3, the initialization package of described step S1
Include following sub-step：
S11：If battery current residual electricity percentage is q：
Q accounts for the percentage of battery maximum electricity for battery current residual electricity, as final detection variable；Q is one
Individual percentage, between 0～100%, in its current battery of expression, dump energy accounts for the percentage of battery maximum electricity,
" the dump energy percentage " generally showing in the intelligent mobile terminals such as smart mobile phone, panel computer.Due to battery
Charge storage ability and discharge capability are all affected by factors such as the aging, variation of ambient temperature of battery, the therefore mesh of the present embodiment
The value as detecting q, that is, q be this " battery residual capacity measurement method " final goal parameter, other all parameters
Presence be ensure battery dump energy percentage q accuracy；
S12：If battery current residual electricity is Q, and initializes Q, make Q=0：
Q is a decimal, and it is used for representing current dump energy in battery, and its unit is current unit and time
The product of unit, usually MAH (mA.H) or ampere-hour (A.H), the value of Q is initialized to 0, represents that battery is swashed just
Electricity when living is 0；
S13：If battery maximum electricity is Qmax：
QmaxIt is a decimal, it is used for representing the maximum electricity that battery may store, i.e. QmaxValue full for battery
Electricity size during electricity condition, its unit is the product of current unit and chronomere, usually MAH (mA.H) or ampere-hour
(A.H), QmaxValue be updated in charging complete each time and calibrate, and then achieve automatic adapt to battery aging and
The impact to battery power storage ability and discharge capability for the variation of ambient temperature；
S14：If the charged state sampling period is Ti, the discharge condition sampling period is To：
TiIt is a decimal, it is used for representing the size in sampling period during battery state of charge, according to frequency and cycle
Relational expression f=1/T, work as TiValue get over hour, charged state sample frequency is higher, works as TiValue bigger when, charged state sample
Frequency is lower；ToIt is a decimal, when it is used for representing battery discharging state, the size in sampling period, works as ToValue get over hour,
Discharge condition sample frequency is higher, works as ToValue bigger when, discharge condition sample frequency is lower；
It should be noted that：Sample frequency is higher, and precision can be higher, and sample frequency is lower, and precision can be lower.But precision
Higher, corresponding amount of calculation increase can bring a certain degree of power consumption to increase, and therefore needs balance in the specific implementation wherein
Pros and cons, construct suitable sampling period function.In addition, for TiAnd ToWhen giving initial value, give according to actual needs
One value that is less and not being 0, because can adjust automatically T in implementation procedure afterwardsiAnd ToValue.
S15：If the battery tension upper limit is Umax, battery tension lower limit is Umin：
UmaxA decimal, it is used for representing upper voltage limit between accumulator plate, its unit be usually volt (V) or
Millivolt (mV), when battery is in charged state, when between accumulator plate, voltage reaches Umax, that is, represent the battery charger of battery
Complete.It should be noted that different types of battery, upper voltage limit often differs greatly.Therefore, need in actual applications
To be U according to the type of batterymaxSetting is corresponding to be worth, the U of such as lithium ion batterymaxIt is worth for 4.2；
UminIt is a decimal, it is used for representing the lower voltage limit between accumulator plate, its unit is volt (V) or millivolt
(mV), when between accumulator plate, open-circuit voltage is less than or equal to UminWhen, that is, represent that accumulator electric-quantity has exhausted.Should be noted
It is, different types of battery, lower voltage limit often differs greatly.Therefore, need the class according to battery in actual applications
Type, is UminSetting is corresponding to be worth, the U of such as lithium ion batteryminIt is worth for 3.
S16：If electrical power number sequence W, its item number upper limit is N：
Each item in W is a decimal, represents the charge or discharge performance number in some moment for the battery, for protecting
The card stability of a system, is also the memory headroom saving charging equipment, charged state electric power detection and the inspection of discharge condition electricity simultaneously
Survey share W ordered series of numbers, specific implementation method in " charged state electric power detection " and " discharge condition electric power detection " step specifically
Bright.It should be noted that the item number of number sequence W is limited in below N, it is to prevent the method in the process of implementation ceaselessly
Take charging equipment memory headroom, and for the speed of response to battery-operated state for the ensuring method.The value of N is got over
Greatly, system operation is more steady, but method can be accordingly slack-off to the speed of response of battery-operated state, otherwise the value of N is less,
Method can be faster to the speed of response of battery-operated state, but system run all right can accordingly weaken.Therefore, in reality
In application, need to arrange a suitable value for N according to the actual needs；
S17：If battery charge/discharge status indicator is Flag：
Flag is a Boolean type variable, and its value is fictitious time, represents that battery is in charged state, its value is true
When, represent that battery is in discharge condition.(representing false with 0 herein, represent true with 1)
After initial work completes, judge that battery is currently at charged state or discharge condition immediately, filling
Respectively using different detection methods when electricity condition and discharge condition, the dump energy of battery is detected.Described storage
There are three kinds of states, respectively charged state, discharge condition and idle state in theory in battery, by battery in the present embodiment
Idle state be considered as the special discharge condition that a kind of discharge current in discharge condition is 0, therefore battery only charges and puts
Electric two states, either-or.
The method being charged state electric power detection in step S3 described in the present embodiment is：It is in charging shape in battery
During state, by the mapping relations of voltage between battery dump energy percentage and accumulator plate, obtain battery dump energy
While percentage, by battery charging current is carried out with the integration with regard to the time, the dump energy of battery is united
Meter.In battery charging complete, the maximum charge value of battery is updated, and then achieves the inspection of battery dump energy
During survey, the cumulative errors of generation are calibrated automatically, and its idiographic flow is as shown in figure 4, include following sub-step：
S31：Judge whether Flag is equal to 1, if Flag==1, make Flag=0 and empty number sequence W；
S32：Obtain charging current value Ii；
S33：Q is made to add up Ii*Ti, i.e. Q=Q+Ii*Ti；
S34：Obtain charging voltage value Ui；
S35：Make q=f (Ui), wherein f (Ui) for battery dump energy percentage with regard to accumulator plate between voltage letter
Numerical value；
S36：Judge UiWhether it is equal to UmaxIf, Ui==UmaxThen make Qmax=Q；
S37：Wait charged state sampling period Ti；
S38：By UiWith IiProduct be added in number sequence W.
The purpose of step S31 is：When battery enters charged state from discharge condition, would indicate that the change of battery condition
Amount Flag is set to 0, represents that battery comes into charged state；When battery enters charged state from discharge condition, by number
In row W, existing discharge power numerical value is all removed, and fills for storage in ensuing " charged state electric power detection " work
Electric work rate score.
The purpose of step S32 and S33 is：Record charged state sampling period TiIn this period of time, battery is filled with
How many electricity.
The purpose of step S34 and S35 is：Mapping by voltage between battery dump energy percentage and accumulator plate
Relation, indirect gain battery dump energy percentage q, f (x) are battery dump energy percentage q with regard to accumulator plate
Between voltage function, the parsing of suitable f (x) function can be constructed according to battery species and accumulator property in actual applications
Formula, by charging voltage UiBring into and can get battery dump energy percentage q=f (Ui).
The purpose of step S36 is：When between accumulator plate, voltage reaches upper limit UmaxWhen, represent battery charging complete, this
When the value of battery dump energy Q is given Qmax, that is, have updated QmaxValue, complete to Q simultaneouslymaxCalibration.
The purpose of step S37 is：Control charged state sample frequency it should be noted that detecting in guarantee the method
The accuracy of the battery dump energy percentage q arriving, is waiting charged state sampling period TiWhen, need to consider " charging
Make the time that logic judgment and numerical operation are consumed in the step for state electric power detection ", that is, adopt twice before and after needing to ensure
Time interval between sample action is accurate Ti.
The purpose of step S38 is：Voltage U between the accumulator plate that get thisiWith charging current IiMultiplication is filled
Electrical power, this charge power numerical value is added in W.Its reason will describe in detail in " dynamically arranging sample frequency " step.
It should be noted that when the item number of number sequence W is less than N, only needing to new charge power when adding new charge power numerical value
Numerical value is added to the end of number sequence W as last of current ordered series of numbers.But, when the item number of number sequence W has reached N
When, need to delete the 1st of current number sequence W before adding new charge power numerical value, using new charge power numerical value as N item
It is added in number sequence W, N is less than with the item number that this keeps number sequence W.
In step S4 described in the present embodiment, the method for discharge condition electric power detection is：It is in discharge condition in battery,
When discharge current is less than certain threshold value, by the mapping relations of voltage between battery dump energy percentage and accumulator plate,
Obtain battery dump energy percentage；When discharge current is more than or equal to this threshold value, by entering to battery discharging electric current
Row, with regard to the integration of time, obtains battery dump energy percentage, the mutual calibration error of two methods.On the one hand pass through f
X () obtains error produced by battery dump energy percentage, battery discharging electric current can be carried out with regard to time integral
Process calibration.On the other hand, by carrying out to battery discharging electric current obtaining battery dump energy hundred with regard to time integral
Divide the produced error of ratio, the process calibration of battery dump energy percentage can be obtained by f (x).Its idiographic flow is such as
Shown in Fig. 5, including following sub-step：
S41：Judge whether Flag is equal to 0, if Flag==0, make Flag=1 and empty number sequence W；
S42：Obtain discharge current Io；
S43：Judge IoWhether it is less than C*QmaxIf, Io<C*QmaxThen obtain discharge voltage value Uo；Otherwise make Q regressive Io*To,
I.e. Q=Q-Io*To, then carry out the operation of step S46；
S44：Judge UoWhether it is equal to UminIf, Uo==Umin, then make Q=0 and q=0, then carry out the behaviour of step S47
Make；
S45：Judge q whether more than battery dump energy percentage with regard to accumulator plate between voltage functional value f
(Uo), if
q>f(Uo), then make q=f (Uo) and Q=q*Qmax, then carry out the operation of step S47, otherwise directly carry out step
S47
Operation；
S46：Judge Q/QmaxWhether it is less than q, if Q/Qmax<Q then makes q=Q/Qmax；
S47：Wait discharge condition sampling period To；
S48：By UoWith IoProduct be added in number sequence W.
The purpose of step S41 is：When battery enters discharge condition from charged state, would indicate that the change of battery condition
Amount Flag is set to 1, represents that battery comes into discharge condition；When battery enters discharge condition from charged state, by number
In row W, existing charge power numerical value is all removed, and puts for storage in ensuing " discharge condition electric power detection " work
Electric work rate score.
The purpose of step S42 and S43 is：Judge the current discharge current I of batteryoWhether sufficiently small, because in electric power storage
During tank discharge, discharge current IoBigger, accumulator plate degree of polarization is bigger, causes voltage between accumulator plate lower.Therefore,
Only in battery discharging electric current IoBattery dump energy percentage and accumulator plate just can be passed through when sufficiently small
Between voltage mapping relations, indirect gain battery dump energy percentage q.But, in battery discharging electric current IoWhen larger,
Accumulator plate degree of polarization is big, and between accumulator plate, voltage is substantially low, now needs by battery discharging electric current Io
Carry out the integration with regard to the time, to obtain battery in discharge cycle ToThis outputs how many electric energy for a period of time, and then calculates
Go out the value of dump energy percentage q.Judging battery discharging electric current IoWhen whether sufficiently small, with battery maximum electricity Qmax
It is multiplied by multiplying power C as critical value, the value of C can be chosen properly according to battery species and accumulator property in actual applications
Value, that is, C represent " electric discharge C lead " of battery.When battery discharging electric current IoLess than this critical value, then it is judged as discharge current
IoSufficiently small, when battery discharging electric current IoMore than or equal to this critical value, then it is judged as discharge current IoLarger.
The purpose of step S44 is：When between discovery accumulator plate, voltage reaches lower limit UminWhen, accumulator electric-quantity Q is set to
0, battery dump energy percentage q is set to 0 simultaneously, that is, have updated the value of Q and q, also complete the calibration of Q and q simultaneously.
The purpose of step S45 is：As discharge current IoWhen sufficiently small, battery dump energy percentage and electric power storage can be passed through
The mapping relations of voltage between the pole plate of pond, indirect gain battery dump energy percentage q.F (x) is battery dump energy percentage
Than q with regard to accumulator plate between voltage function, in actual applications can according to battery species and accumulator property construction close
Suitable f (x) function analytic expression, by discharge voltage UoBring into and can get battery dump energy percentage q=f (Uo), with season
Q=q*Qmax, the value of Q is calibrated.For avoiding the mistake of battery dump energy numerical value resilience, q is carried out assignment it
Before, first determine whether whether q is more than f (Uo), if q is more than f (Uo), then make q=f (Uo), otherwise do not operate.
The purpose of step S46 is：As discharge current IoWhen larger, by discharge current IoCarry out the integration with regard to the time,
Obtain in discharge condition sampling period ToThis following period of time battery outputs how many electricity, by deducting original electricity
The electricity consuming, obtains the numerical value of new battery dump energy percentage q.For avoiding battery dump energy numerical value resilience
Mistake, before carrying out assignment to q, first determines whether Q/QmaxWhether it is less than q, if Q/QmaxLess than q, then make q=Q/Qmax, otherwise
Do not operate.
The purpose of step S47 is：Control discharge condition sample frequency.It should be noted that for ensureing to examine in the present embodiment
The accuracy of the battery dump energy percentage q measuring, is waiting discharge condition sampling period ToWhen, need to consider " putting
Make the time that logic judgment and numerical operation are consumed, that is, before and after needing to ensure twice in the step for electricity condition electric power detection "
Time interval between sampling action is accurate To.
The purpose of step S48 is：Voltage U between the accumulator plate that get thisoWith discharge current IoMultiplication is put
Electrical power, this discharge power numerical value is added in W.Its reason will describe in detail in " dynamically arranging sample frequency " step.
It should be noted that when the item number of number sequence W is less than N, only needing to new discharge power when adding new discharge power numerical value
Numerical value is added to the end of number sequence W as last of current ordered series of numbers.But, when the item number of number sequence W has reached N
When, need to delete the 1st of current number sequence W before adding new discharge power numerical value, using new discharge power numerical value as N item
It is added in number sequence W, N is less than with the item number that this keeps number sequence W.
As shown in fig. 6, dynamic setting sample frequency comprises the following steps in S5 described in the present embodiment：
S51：Calculate standard deviation α of number sequence W；
S52：Judge whether Flag is equal to 0, if Flag==0, carry out step S53, otherwise carry out step S54；
S53：Make TiEqual to the charged state sampling period with regard to number sequence W standard deviation α functional value Tin(α)；
S54：Make ToEqual to the discharge condition sampling period with regard to number sequence W standard deviation α functional value Tout(α).
The purpose of step S51 is：By calculating standard deviation α of number sequence W, obtain the battery state of charge that represented with α or
Under discharge condition, the degree of stability of its charge power or discharge power.The value of α is bigger, represents that stability is poorer, the value of α is less,
Represent that stability is stronger.
The purpose of step S52 is：By judging to the value of battery condition flag Flag, obtain battery current
It is in charged state or discharge condition, respectively charged state electric power detection and the setting of discharge condition electric power detection are adopted accordingly
The sample cycle.
The purpose of step S53 is：Obtain the α of an expression charge power stability in step s 51, α value is bigger,
Represent charge power stability poorer it should be correspondingly improved charged state sample frequency Ti, to adapt to unstable charging work(
Rate.α value is less, represents that charge power stability is stronger, can correspondingly reduce charged state sample frequency Ti, reduce work
Amount, reduces the power consumption of method.It should be noted that sample frequency is higher, precision is higher, and power consumption also has certain journey simultaneously
Degree increases, and sample frequency is lower, and precision is lower, and power consumption simultaneously also has and to a certain degree reduces, and therefore in actual applications, needs
Weigh the advantages and disadvantages, a suitable charged state sampling period T can be constructed as needediFunction T with regard to standard deviation α of number sequence Win
(α).
The purpose of step S54 is：Obtain the α of an expression discharge power stability in step s 51, α value is bigger,
Represent discharge power stability poorer it should be correspondingly improved discharge condition sample frequency To, to adapt to unstable electric discharge work(
Rate.α value is less, represents that discharge power stability is stronger, can correspondingly reduce discharge condition sample frequency To, reduce work
Amount, reduces the power consumption of method.It should be noted that sample frequency is higher, precision is higher, and power consumption also has certain journey simultaneously
Degree increases, and the lower precision of sample frequency is lower, and power consumption simultaneously also has and to a certain degree reduces.Therefore in actual applications, need
Weigh the advantages and disadvantages, a suitable discharge condition sampling period T can be constructed as neededoFunction with regard to standard deviation α of number sequence W
Tout(α).
All of above step logically creates a loop structure, obtains battery dump energy percentage in real time, enters
And realize the accurate detection to charging equipment internal battery dump energy percentage.
The realization of " tired error count difference is calibrated automatically " function of the present invention is so that the detection method of the present invention can adapt to store automatically
The impact to battery power storage ability and discharge capability of cell degradation and variation of ambient temperature.The electric power detection process of the present invention is complete
Entirely it is not required to manually to participate in, as long as after the once complete charge/discharge process of battery experience, you can autonomous learning is in method
Need the parameters value using.
No matter battery is in charged state or discharge condition to the battery residual capacity measurement method of the present invention, and it is adopted
The current working condition of sample frequency equal dynamic adaptable battery is it is achieved that dynamic frequency-conversion is sampled.Therefore this method is generally suitable for
In all kinds, the battery of various models, that is, this " battery residual capacity measurement method " there is universality.Intelligent mobile is eventually
End itself possesses analog acquisition ability and necessary operational capability, does not therefore need to increase for implementing this method any hard
Part, on the premise of not increasing hardware cost, achieves charging equipment internal battery dump energy with software algorithm purely
Accurate detection function.If in actual applications, needing to set in the charging not possessing analog acquisition ability and operational capability
Standby middle enforcement this method, then must specially add and adopt for the analog quantity gathering voltage and charge/discharge current between accumulator plate
Storage and the computing chip being suitable for.
Those of ordinary skill in the art will be appreciated that, embodiment described here is to aid in reader and understands this
Bright principle is it should be understood that protection scope of the present invention is not limited to such special statement and embodiment.This area
Those of ordinary skill can make various other each without departing from present invention essence according to these technology disclosed by the invention enlightenment
Plant concrete deformation and combine, these deform and combine still within the scope of the present invention.
Claims (2)
1. a kind of battery residual capacity measurement method it is characterised in that：Comprise the following steps：
S1：Initialization, carries out Initialize installation to the parameter needing to use；Including following sub-step：
S11：If battery current residual electricity percentage is q, q accounts for battery maximum electricity for battery current residual electricity
Percentage, as final detection variable；
S12：If battery current residual electricity is Q, and initializes Q, make Q=0；
S13：If battery maximum electricity is Qmax；
S14：If the charged state sampling period is Ti, the discharge condition sampling period is To；
S15：If the battery tension upper limit is Umax, battery tension lower limit is Umin；
S16：If electrical power number sequence W, its item number upper limit is N；
S17：If battery charge/discharge status indicator is Flag, when Flag value is for 0, represent charged state, its value is to represent when 1 to put
Electricity condition；
S2：Judging that battery is currently at charged state or discharge condition, if being in charged state, carrying out step S3, such as
Fruit is in discharge condition and then carries out step S4；
S3：It is charged state electric power detection；Including following sub-step：
S31：Judge whether Flag is equal to 1, if Flag==1, make Flag=0 and empty number sequence W；
S32：Obtain charging current value Ii；I represents the number of times of charged state detection, and i is positive integer；
S33：Q is made to add up Ii*Ti, i.e. Q=Q+Ii*Ti；
S34：Obtain charging voltage value Ui；
S35：Make q=f (Ui), wherein f (Ui) for battery dump energy percentage with regard to accumulator plate between voltage function
Value；
S36：Judge UiWhether it is equal to UmaxIf, Ui==UmaxThen make Qmax=Q；
S37：Wait charged state sampling period Ti；
S38：By UiWith IiProduct be added in number sequence W；
S4：Carry out discharge condition electric power detection；Including following sub-step：
S41：Judge whether Flag is equal to 0, if Flag==0, make Flag=1 and empty number sequence W；
S42：Obtain discharge current Io；O represents the number of times of charged state detection, and o is positive integer；
S43：Judge IoWhether it is less than C*QmaxIf, Io<C*QmaxThen obtain discharge voltage value Uo；Otherwise make Q regressive Io*To, i.e. Q=
Q-Io*To, then carry out the operation of step S46；
S44：Judge UoWhether it is equal to UminIf, Uo==Umin, then make Q=0 and q=0, then carry out the operation of step S47；
S45：Judge q whether more than battery dump energy percentage with regard to accumulator plate between voltage functional value f (Uo), if q
>f(Uo), then make q=f (Uo) and Q=q*Qmax, then carry out the operation of step S47, otherwise directly carry out the operation of step S47；
S46：Judge Q/QmaxWhether it is less than q, if Q/Qmax<Q then makes q=Q/Qmax；
S47：Wait discharge condition sampling period To；
S48：By UoWith IoProduct be added in number sequence W；
S5：Dynamic setting sample frequency, return to step S2, dynamic setting sample frequency comprises the following steps：
S51：Calculate standard deviation α of number sequence W；
S52：Judge whether Flag is equal to 0, if Flag==0, carry out step S53, otherwise carry out step S54；
S53：Make TiEqual to the charged state sampling period with regard to number sequence W standard deviation α functional value Tin(α)；
S54：Make ToEqual to the discharge condition sampling period with regard to number sequence W standard deviation α functional value Tout(α).
2. battery residual capacity measurement method according to claim 1 it is characterised in that：Described battery is in theory
Three kinds of states of upper presence, respectively charged state, discharge condition and idle state, the idle state of battery is considered as the shape that discharges
In state, a kind of discharge current is 0 special discharge condition, and therefore battery only has charging and discharging two states, either-or.
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| CN114636949B (en) * | 2022-03-03 | 2022-10-25 | 杭州华塑科技股份有限公司 | Method and device for judging charge and discharge states of battery |
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