CN109103526A - A kind of battery variable-frequency pulse fast charge method based on fuzzy control - Google Patents
A kind of battery variable-frequency pulse fast charge method based on fuzzy control Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The present invention relates to a kind of battery variable-frequency pulse fast charge method based on fuzzy control, comprising the following steps: pulse charge is carried out to battery, monitors and acquire the status information of battery；Real-time tracking is carried out to optimal frequency corresponding in battery charging process by perturbation observation method, the corresponding maximum current of optimal frequency is chosen and continues to charge to battery；Fuzzy control model is designed, obtains giving the opportunity of negative pulse and the time L of negative pulse discharge by fuzzy control method；Capacity judgement is carried out to battery；If accumulator capacity Q is greater than expiring for battery setting and fills when judging capacity Q1, judgement is completely filled to battery；If battery completely fills, terminate to charge；If battery does not fill completely, continue to charge, until completely filling.Physical damage caused by charging method of the invention avoids battery due to overcharging or overheat, improves the charge efficiency of battery, realizes the safe and efficient quick charge of battery.
Description
Technical field
The invention belongs to accumulator charging technology fields, in particular relate to a kind of battery frequency conversion based on fuzzy control
Fast pulse charger method.
Background technique
Nickel-cadmium/nickel-hydrogen cell and lithium ion battery are with its high power factor, long circulation life, quick charge capability, excellent
Load characteristic and cost performance obtained in portable, field or military electronic product (such as unmanned plane, field communication station)
It is widely applied.Considered based on structure and cost performance, power storage cell usually requires trickle charge to maintain its performance, fills in this way
The electric time will be up to for ten a few houres, must charge (rate of charge > 1C) using big multiplying power in order to shorten the charging time just come real
Existing quick charge.
The method of big multiplying power charging has exceeded the intrinsic acceptable charging current characteristic of battery, and the electricity beyond part will
For generating gas evolution, battery shedding is caused to damage.The root that this phenomenon occurs is along with big
The intervention of electric current, the polarization phenomena of battery seriously hinder the progress of electrolytics reaction, and eventually lead to battery can not
Back reaction.
It is therefore proposed that a kind of safe and efficient fast storage battery charging method is necessary.
Summary of the invention
According to problems of the prior art, the present invention provides a kind of battery variable-frequency pulse based on fuzzy control
Fast charge method, physical damage caused by which obviate batteries due to overcharging or overheat improve the charging effect of battery
Rate realizes the safe and efficient quick charge of battery.
For achieving the above object, the present invention provides a kind of, and the battery variable-frequency pulse based on fuzzy control quickly fills
Method for electrically includes the following steps:
S1 carries out pulse charge to battery, monitors and acquire the status information of battery；
S2 carries out real-time tracking to optimal frequency corresponding in battery charging process by perturbation observation method, chooses most
The corresponding maximum current of excellent frequency continues to charge to battery；
S3 designs fuzzy control model, obtains giving opportunity and the negative pulse discharge of negative pulse by fuzzy control method
Time L；When the end voltage U of battery is greater than the gassing point voltage U of batteryqWhen, when carrying out negative pulse discharge to battery
Between L, when the end voltage U of battery drops to gassing point voltage UqAfterwards, stop negative pulse discharge, be transferred to positive pulse charging；
S4 is completely filled judgement to battery, if battery completely fills, terminates to charge；If battery does not fill completely,
Then continue to charge, until completely filling.
Preferably, the status information of the battery includes end voltage U, charging current I, the temperature T, battery of battery
Variation delta SOC, temperature variation Δ T and the polarizing voltage U of state-of-chargep。
It is further preferred that specific step is as follows by step S2:
The optimal frequency expression formula of battery are as follows:
foptimal(t+1)=foptimal(t)+fperturbation
Wherein, foptimalIt (t+1) is new optimal frequency, the i.e. optimal frequency at t+1 moment, foptimalIt (t) is t moment
Optimal frequency, fperturbationFor disturbance quantity；
As I (t+1)-I (t) > 0, fperturbation=Δ f, otherwise fperturbation=0；
As I (t+2)-I (t) > 0, fperturbation=-2 Δ f, otherwise fperturbation=Δ f；
Wherein, I (t) is the charging current of t moment, and I (t+1) is the charging current at t+1 moment, and I (t+2) is the t+2 moment
Charging current, Δ f be disturbance step frequency；
First the frequency f of charging moment t momentoptimal(t) it is used as optimal frequency, records the electric current I of battery at this time
(t), charge frequency one positive disturbance step delta f is then given, the electric current after observation disturbance in t+1 moment battery becomes
Change；If the difference after disturbing between the electric current I (t+1) and I (t) of battery greater than zero, using the frequency after disturbance as
Otherwise optimal frequency does not change frequency；The disturbance step-length for giving one opposite direction of charge frequency, 2 Δ f again at the t+1 moment, if t+2
Difference between the electric current I (t+2) and I (t+1) at moment is greater than zero, then continues on the disturbance step that opposite direction disturbs 2 Δ f
It is long, otherwise new optimal frequency is found to charge frequency one positive disturbance step delta f.
Still more preferably, fuzzy control model includes fuzzy controller 1 and fuzzy controller 2 in step S3, described
Specific step is as follows for fuzzy control method:
First design fuzzy controller 1, using the variation delta SOC of storage battery charge state and temperature variation Δ T as
The input quantity of fuzzy controller 1, the output quantity of fuzzy controller 1 are the gassing point voltage U in charging processq；State-of-charge
The Fuzzy Linguistic Variable of variation delta SOC and temperature variation Δ T be selected as VS (very little), S (small), M (in), B (big), VB is (non-
It is often big) }, gassing point voltage UqFuzzy set element be selected as VL (very low), L (low), M (in), H (height), VH is (very
It is high) }；
Fuzzy controller 2 is redesigned, by storage battery charge state SOC and polarizing voltage UpAs the defeated of fuzzy controller 2
Enter amount, the output quantity of fuzzy controller 2 is the time L of negative pulse discharge；State-of-charge SOC, polarizing voltage UpIt is put with negative pulse
The Fuzzy Linguistic Variable of the time L of electricity is selected as { PZ (zero), PS (just small), PM (center), PB (honest), PV (very big) }；
The gassing point voltage U that fuzzy controller 1 passes through outputqIt is compared with the end voltage U of battery, when the end of battery electricity
U is pressed to be greater than the gassing point voltage U of batteryqWhen, fuzzy controller 1 gives the opportunity of negative pulse, and jumps to fuzzy controller
2；Fuzzy controller 2 is on the opportunity for judging negative pulse, and of short duration to battery progress to stop filling, fuzzy controller 2 is according to battery
State-of-charge SOC and gassing point voltage UqThe time L of judgement output negative pulse discharge；When the end voltage U of battery drops to analysis
Gas point voltage UqAfterwards, stop negative pulse discharge, be transferred to positive pulse charging.
Still more preferably, specific step is as follows in step S4:
If battery is nickel-cadmium/nickel-hydrogen cell, is calculated using the equal-pressure-difference time difference and judge whether completely to fill；In ni-Cd/nickel
Hydrogen battery battery charging characteristic curve ascent stage, as charging progresses, the end voltage U of nickel-cadmium/nickel-hydrogen cell increase slope
Changing always；The growth of an equal amount of end voltage U, the time t of consuming have and increase to reduction and arrive increased process again；?
Equal-pressure-difference time difference measurements register is set in charging process, Dynamic comparison is carried out to the equal-pressure-difference time difference of measurement, works as the time
Difference is by ti>ti+1It is converted into ti<ti+1Afterwards, and ti>tmaxWhen, determine that battery completely fills, terminates charging；Wherein, tiFor the moment
The consuming time of i-th of equal-pressure-difference, ti+1For the consuming time of moment i+1 equal-pressure-difference, tmaxFor the consuming of all equal-pressure-differences
Time maximum value；
If battery is lithium battery, is calculated using voltage negative growth rate F and judge whether completely to fill；In each pulse charge
Interior cell voltage continues rising up to V1, then stop charging T0After time, cell voltage is reduced to setting value V0When, then voltage
Negative growth rate F can be indicated are as follows:
Wherein, V1For the ceiling voltage that battery in pulse charge rises, V0To stop filling the minimum setting value of phase voltage decline,
T0To stop filling the time.When battery is approached and is completely filled, V1It can gradually become smaller, and T0It can become larger, in this way in V1And T0Change simultaneously
Under, battery voltage negative increment rate F can be smaller and smaller；As F≤F1When, determine that battery completely fills, terminates charging；Wherein, F1
For upper limit voltage negative growth rate；
If battery does not fill completely, continue to charge, until completely filling.
The beneficial effects of the present invention are:
1) present invention proposes a kind of battery variable-frequency pulse fast charge method based on fuzzy control, is charging to reduce
Energy loss in the process chooses optimal frequency by perturbation observation method and charges to battery, to reduce battery impedance, makes
It is minimum to obtain the energy consumed in impedance during the charging process, to obtain maximum charging current；Charging process is considered simultaneously
In not can avoid the polarity effect that will appear the charging bring of battery negatively affected, by design fuzzy control model and
Fuzzy control method takes negative pulse to depolarize measure；In addition, in order to accurately judge whether battery completely fills, for ni-Cd/nickel
Hydrogen battery and lithium battery, are respectively adopted the equal-pressure-difference time difference and voltage negative growth rate is completely filled to control, and battery is avoided to occur
Fill phenomenon.Therefore, physical damage caused by charging method of the invention avoids battery due to overcharging or overheat, improves storage
The charge efficiency of battery realizes the safe and efficient quick charge of battery.
Detailed description of the invention
Fig. 1 is the flow chart of charging method of the invention.
Fig. 2 is the algorithm flow chart for finding optimal frequency.
Fig. 3 is the experiment spectrum analysis figure of lithium ion battery.
Fig. 4 a, Fig. 4 b, Fig. 4 c are illustrated respectively in disturbance step-length when being respectively 300Hz, 500Hz and 700Hz, the sampling of battery
Current curve diagram.
Fig. 5 is the schematic diagram of fuzzy control model.
Fig. 6 a, Fig. 6 b, Fig. 6 c are respectively variation delta SOC, the temperature variation Δ T and gassing point voltage U of state-of-chargeq
Membership function curve.
Fig. 7 is fuzzy control method flow chart.
Fig. 8 a is polarizing voltage Up, state-of-charge SOC membership function curve.
Fig. 8 b is the membership function curve of the time L of negative pulse discharge
Fig. 9 is the judgement schematic diagram of equal-pressure-difference time difference.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
As shown in Figure 1, the present invention provides a kind of battery variable-frequency pulse fast charge method based on fuzzy control, packet
Include following steps:
1, pulse charge is carried out to battery, monitors and acquire the status information of battery；
Specifically, the status information of the battery includes end voltage U, charging current I, the temperature T, battery of battery
Variation delta SOC, temperature variation Δ T and the polarizing voltage U of state-of-chargep。
2, real-time tracking is carried out to optimal frequency corresponding in battery charging process by perturbation observation method, chosen optimal
The corresponding maximum current of frequency continues to charge to battery；
Specifically, the optimal frequency expression formula of battery are as follows:
foptimal(t+1)=foptimal(t)+fperturbation
Wherein, foptimalIt (t+1) is new optimal frequency, the i.e. optimal frequency at t+1 moment, foptimalIt (t) is t moment
Optimal frequency, fperturbationFor disturbance quantity；
As I (t+1)-I (t) > 0, fperturbation=Δ f, otherwise fperturbation=0；
As I (t+2)-I (t) > 0, fperturbation=-2 Δ f, otherwise fperturbation=Δ f；
Wherein, I (t) is the charging current of t moment, and I (t+1) is the charging current at t+1 moment, and I (t+2) is the t+2 moment
Charging current, Δ f be disturbance step frequency；
As shown in Fig. 2, first the frequency f of charging moment t momentoptimal(t) it is used as optimal frequency, records electric power storage at this time
Then the electric current I (t) in pond gives charge frequency one positive disturbance step delta f, in t+1 moment battery after observation disturbance
Curent change；If the difference after disturbing between the electric current I (t+1) and I (t) of battery is greater than zero, after disturbance
Otherwise frequency does not change frequency as optimal frequency；The disturbance of one opposite direction of charge frequency, 2 Δ f is given to walk again at the t+1 moment
It is long, if the difference between the electric current I (t+2) and I (t+1) at t+2 moment is greater than zero, continues on opposite direction and disturb 2 Δ f's
Step-length is disturbed, otherwise finds new optimal frequency to charge frequency one positive disturbance step delta f.
The time that the size relation of the step-length of disturbance charges to optimal frequency, the present embodiment uses the side of comparative experiments thus
Method determines disturbance step-length.The value range of selected lithium ion battery optimal frequency should be determined first.When charging, use
Spectrum analyzer (Agilent N9020A MXA) carries out spectrum analysis to the lithium ion battery in experiment, while recording lithium ion
Impedance value when battery charge state is respectively 0.1,0.5 and 1, the frequency spectrum for obtaining battery are as shown in Figure 2.From the figure 3, it may be seen that lithium from
Optimal frequency of the sub- battery under different state-of-charges is near 1kHz.
Secondly, system can be made to be in smaller value charging for a long time when disturbance is smaller, when disturbing larger, it is possible to can miss most
High current value vibrates near the maximum.So being compiled according to the analysis to lithium ion battery spectrogram optimal frequency range
Journey setting disturbance step-length is respectively f=300Hz, and f=500Hz, f=700Hz carry out perturbation observation method tracking optimal frequency experiment,
Analytical sampling current value determines the speed and accuracy of tracking.Fig. 4 a, Fig. 4 b, Fig. 4 c are illustrated respectively in disturbance step-length
When 300Hz, 500Hz and 700Hz, the sample rate current curve graph of battery.
Maximum current value is traced by 0.2s with the step-length perturbed system of 700Hz according to experimental result, with 500Hz
Step-length disturbance trace into maximum current value by 0.295s, and just traced into most with the disturbance of the step-length of 300Hz by 0.525s
High current value.Electric current after being disturbed with 700Hz vibrates near the maximum, and current maxima institute is traced into after disturbing with 300Hz
The time needed is longer, so that system is worked long hours under lesser electric current, reduces energy utilization rate.Step-length is disturbed with 500Hz
It is shorter and be able to maintain maximum value and charge the battery to trace into the time used in maximum current.
3, fuzzy control model is designed, obtains giving opportunity and the negative pulse discharge of negative pulse by fuzzy control method
Time L；When the end voltage U of battery is greater than the gassing point voltage U of batteryqWhen, the negative pulse discharge time is carried out to battery
L, when the end voltage U of battery drops to gassing point voltage UqAfterwards, stop negative pulse discharge, be transferred to positive pulse charging；
Specifically, as shown in figure 5, fuzzy control model includes fuzzy controller 1 and fuzzy controller 2, the Fuzzy Control
Specific step is as follows for method processed:
Fuzzy controller 1 is designed first, as shown in Fig. 6 a, Fig. 6 b, Fig. 6 c, by the variation delta of storage battery charge state
The input quantity of SOC and temperature variation Δ T as fuzzy controller 1, the output quantity of fuzzy controller 1 are the analysis in charging process
Gas point voltage Uq；The Fuzzy Linguistic Variable of the variation delta SOC and temperature variation Δ T of state-of-charge are selected as { VS (very little), S
(small), M (in), B (big), VB (very big) }, gassing point voltage UqFuzzy set element be selected as VL (very low), L (low),
M (in), H (height), VH (very high) }, as shown in table 1；
Table 1: the fuzzy control rule of fuzzy controller 1
In the present embodiment, the Fuzzy Linguistic Variable domain of temperature variation Δ T is set as { 0,5,10,15,20,25 }, charged
The Fuzzy Linguistic Variable domain of the variation delta SOC of state is set as { 0,10,20,30,40,50 }, gassing point voltage UqIt is fuzzy
Set element domain is set as { 0,0.5,1,1.5,2,2.5,3,3.5 }.
Fuzzy controller 2 is redesigned, as shown in Fig. 8 a, Fig. 8 b, by storage battery charge state SOC and polarizing voltage UpAs
The input quantity of fuzzy controller 2, the output quantity of fuzzy controller 2 are the time L of negative pulse discharge；State-of-charge SOC, polarization electricity
Press UpWith the Fuzzy Linguistic Variable of the time L of negative pulse discharge be selected as PZ (zero), PS (just small), PM (center), PB (honest),
PV (very big) }, as shown in table 2；
Table 2: the fuzzy control rule of fuzzy controller 2
In the present embodiment, state-of-charge SOC and polarizing voltage UpFuzzy Linguistic Variable domain be set as 0 ,+1 ,+2 ,+
3 ,+4 ,+5 ,+6 }, the Fuzzy Linguistic Variable domain of the time L of negative pulse discharge be set as 0 ,+1 ,+2 ,+3 ,+4 ,+5 ,+6 ,+7 ,+
8 ,+9 }.
As shown in fig. 7, gassing point voltage U of the fuzzy controller 1 by outputqIt is compared with the end voltage U of battery, works as storage
The end voltage U of battery is greater than the gassing point voltage U of batteryqWhen, fuzzy controller 1 gives the opportunity of negative pulse, and jumps to
Fuzzy controller 2；Fuzzy controller 2 is in the opportunity for judging negative pulse, of short duration to battery progress to stop filling, fuzzy controller 2
According to storage battery charge state SOC and gassing point voltage UqThe time L of judgement output negative pulse discharge；When the end voltage of battery
U drops to gassing point voltage UqAfterwards, stop negative pulse discharge, be transferred to positive pulse charging.
When realizing software section function, the data in designed control rule table are all stored to TMS320F2812
EEPROM in.Directly the rale element being stored in EEPROM can be recalled when executing fuzzy control function, according to setting
The position set is put into table, is next just tabled look-up and is brought into operation.When program is initial, data are first put into TMS320F2812
Inside, wait the later period calling.In parameter adjustment, only do not have to adjust entire journey with the data stored in EEPROM are changed
Sequence.
Lithium ion battery pause charging is obtained by the analysis of collected data, judgement and gives the width of electric discharge negative pulse
Degree, and store the result in general purpose timer T1, then timer T1 executes interrupt routine, and interruption therein is called to service journey
The pwm pulse that sequence generates adjusts duty ratio.
4, judgement is completely filled to battery, if battery completely fills, terminates to charge；If battery does not fill completely,
Then continue to charge, until completely filling.
Specifically, being calculated using the equal-pressure-difference time difference if battery is nickel-cadmium/nickel-hydrogen cell and judging whether completely to fill；Such as
Shown in Fig. 7, in nickel-cadmium/nickel-hydrogen cell battery charging characteristic curve ascent stage, as charging progresses, nickel-cadmium/nickel-hydrogen cell
End voltage U increase slope changing always；The growth of an equal amount of end voltage U, the time t of consuming have and increase to reduction
Increased process is arrived again；Equal-pressure-difference time difference measurements register is set during the charging process, to equal-pressure-difference time difference of measurement into
Mobile state compares, when the time difference is by ti>ti+1It is converted into ti<ti+1Afterwards, and ti>tmaxWhen, determine that battery completely fills, terminates to fill
Electricity；Wherein, tiFor the consuming time of i-th of equal-pressure-difference of moment, ti+1For the consuming time of moment i+1 equal-pressure-difference, tmaxFor
The consuming time maximum value of all equal-pressure-differences；
If battery is lithium battery, is calculated using voltage negative growth rate F and judge whether completely to fill；In each pulse charge
Interior cell voltage continues rising up to V1, then stop charging T0After time, cell voltage is reduced to setting value V0When, then voltage
Negative growth rate F can be indicated are as follows:
Wherein, V1For the ceiling voltage that battery in pulse charge rises, V0To stop filling the minimum setting value of phase voltage decline,
T0To stop filling the time.When battery is approached and is completely filled, V1It can gradually become smaller, and T0It can become larger, in this way in V1And T0Change simultaneously
Under, battery voltage negative increment rate F can be smaller and smaller；As F≤F1When, determine that battery completely fills, terminates charging；Wherein, F1
For upper limit voltage negative growth rate.
In the present embodiment, F is worked as in setting1Size be 3mV/s when, determine battery be full of, charging stop；At this point, V1=
1.532V,V0=1.523V, T0=0.5min.
If battery does not fill completely, continue to charge, until completely filling.
In conclusion the invention proposes a kind of battery variable-frequency pulse fast charge method based on fuzzy control,
Physical damage caused by battery is avoided due to overcharging or overheat, improves the charge efficiency of battery, realizes battery
Safe and efficient quick charge.
Claims (5)
1. a kind of battery variable-frequency pulse fast charge method based on fuzzy control, which comprises the steps of:
S1 carries out pulse charge to battery, monitors and acquire the status information of battery；
S2 carries out real-time tracking to optimal frequency corresponding in battery charging process by perturbation observation method, chooses optimal frequency
The corresponding maximum current of rate continues to charge to battery；
S3, design fuzzy control model, by fuzzy control method obtain giving negative pulse opportunity and negative pulse discharge when
Between L；When the end voltage U of battery is greater than the gassing point voltage U of batteryqWhen, negative pulse discharge time L is carried out to battery,
When the end voltage U of battery drops to gassing point voltage UqAfterwards, stop negative pulse discharge, be transferred to positive pulse charging；
S4 is completely filled judgement to battery, if battery completely fills, terminates to charge；If battery does not fill completely, after
Continuous charging, until completely filling.
2. a kind of battery variable-frequency pulse fast charge method based on fuzzy control according to claim 1, feature
Be: the status information of the battery includes end voltage U, the charging current I, temperature T, storage battery charge state of battery
Variation delta SOC, temperature variation Δ T and polarizing voltage Up。
3. a kind of battery variable-frequency pulse fast charge method based on fuzzy control according to claim 2, feature
It is, specific step is as follows by step S2:
The optimal frequency expression formula of battery are as follows:
foptimal(t+1)=foptimal(t)+fperturbation
Wherein, foptimalIt (t+1) is new optimal frequency, the i.e. optimal frequency at t+1 moment, foptimalIt (t) is the optimal of t moment
Frequency, fperturbationFor disturbance quantity；
As I (t+1)-I (t) > 0, fperturbation=Δ f, otherwise fperturbation=0；
As I (t+2)-I (t) > 0, fperturbation=-2 Δ f, otherwise fperturbation=Δ f；
Wherein, I (t) is the charging current of t moment, and I (t+1) is the charging current at t+1 moment, and I (t+2) is filling for t+2 moment
Electric current, Δ f are disturbance step frequency；
First the frequency f of charging moment t momentoptimal(t) it is used as optimal frequency, records the electric current I (t) of battery at this time, so
Charge frequency one positive disturbance step delta f is given afterwards, in the curent change of t+1 moment battery after observation disturbance；If
Difference after disturbing between the electric current I (t+1) and I (t) of battery is greater than zero, then using the frequency after disturbance as optimal frequency
Otherwise rate does not change frequency；Give the disturbance step-length of one opposite direction of charge frequency, 2 Δ f again at the t+1 moment, if the t+2 moment
Difference between electric current I (t+2) and I (t+1) is greater than zero, then continues on the disturbance step-length that opposite direction disturbs 2 Δ f, otherwise
New optimal frequency is found to charge frequency one positive disturbance step delta f.
4. a kind of battery variable-frequency pulse fast charge method based on fuzzy control according to claim 3, feature
Be, fuzzy control model includes fuzzy controller 1 and fuzzy controller 2 in step S3, the fuzzy control method it is specific
Steps are as follows:
Fuzzy controller 1 is designed first, using the variation delta SOC of storage battery charge state and temperature variation Δ T as fuzzy
The input quantity of controller 1, the output quantity of fuzzy controller 1 are the gassing point voltage U in charging processq；The variation of state-of-charge
Amount Δ SOC and temperature variation Δ T Fuzzy Linguistic Variable be selected as VS (very little), S (small), M (in), B (big), VB is (very
Greatly) }, gassing point voltage UqFuzzy set element be selected as VL (very low), L (low), M (in), H (height), VH (very high) }；
Fuzzy controller 2 is redesigned, by storage battery charge state SOC and polarizing voltage UpAs the input quantity of fuzzy controller 2,
The output quantity of fuzzy controller 2 is the time L of negative pulse discharge；State-of-charge SOC, polarizing voltage UpWith negative pulse discharge when
Between the Fuzzy Linguistic Variable of L be selected as { PZ (zero), PS (just small), PM (center), PB (honest), PV (very big) }；
The gassing point voltage U that fuzzy controller 1 passes through outputqIt is compared with the end voltage U of battery, when the end voltage U of battery is big
In the gassing point voltage U of batteryqWhen, fuzzy controller 1 gives the opportunity of negative pulse, and jumps to fuzzy controller 2；It is fuzzy
Controller 2 is on the opportunity for judging negative pulse, and of short duration to battery progress to stop filling, fuzzy controller 2 is according to the charged shape of battery
State SOC and gassing point voltage UqThe time L of judgement output negative pulse discharge；When the end voltage U of battery drops to gassing point electricity
Press UqAfterwards, stop negative pulse discharge, be transferred to positive pulse charging.
5. a kind of battery variable-frequency pulse fast charge method based on fuzzy control according to claim 4, feature
It is, specific step is as follows in step S4:
If battery is nickel-cadmium/nickel-hydrogen cell, is calculated using the equal-pressure-difference time difference and judge whether completely to fill；In ni-Cd/ni-mh electricity
Pond battery charging characteristic curve ascent stage, as charging progresses, the end voltage U of nickel-cadmium/nickel-hydrogen cell increase slope always
Changing；The growth of an equal amount of end voltage U, the time t of consuming have and increase to reduction and arrive increased process again；It is charging
Equal-pressure-difference time difference measurements register is set in the process, Dynamic comparison is carried out to equal-pressure-difference time difference of measurement, when the time difference by
ti>ti+1It is converted into ti<ti+1Afterwards, and ti>tmaxWhen, determine that battery completely fills, terminates charging；Wherein, tiIt is i-th of the moment
The consuming time of equal-pressure-difference, ti+1For the consuming time of moment i+1 equal-pressure-difference, tmaxFor all equal-pressure-differences the consuming time most
Big value；
If battery is lithium battery, is calculated using voltage negative growth rate F and judge whether completely to fill；Within each pulse charge time
Cell voltage continues rising up to V1, then stop charging T0After time, cell voltage is reduced to setting value V0When, then voltage negative increases
Long rate F can be indicated are as follows:
Wherein, V1For the ceiling voltage that battery in pulse charge rises, V0To stop filling the minimum setting value of phase voltage decline, T0For
Stop filling the time.When battery is approached and is completely filled, V1It can gradually become smaller, and T0It can become larger, in this way in V1And T0Under changing simultaneously,
Battery voltage negative increment rate F can be smaller and smaller；As F≤F1When, determine that battery completely fills, terminates charging；Wherein, F1For
Upper limit voltage negative growth rate；
If battery does not fill completely, continue to charge, until completely filling.
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| CN111244565A (en) * | 2020-01-19 | 2020-06-05 | 威海安屯尼智能电子科技有限公司 | Charging method and charger for prolonging service life of lithium ion battery and preventing accumulation of polar plates |
| CN114069751A (en) * | 2020-08-07 | 2022-02-18 | 北京小米移动软件有限公司 | Charging control method, charging control device, and storage medium |
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Cited By (2)
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