CN106990805A - Dynamic current control method and system - Google Patents
Dynamic current control method and system Download PDFInfo
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- CN106990805A CN106990805A CN201710089560.2A CN201710089560A CN106990805A CN 106990805 A CN106990805 A CN 106990805A CN 201710089560 A CN201710089560 A CN 201710089560A CN 106990805 A CN106990805 A CN 106990805A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/625—Regulating voltage or current wherein it is irrelevant whether the variable actually regulated is AC or DC
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Abstract
The invention belongs to current control field, a kind of dynamic current control method and system are specifically provided.Present invention seek to address that the problem of method for early warning that existing battery current transfinites can not make early warning in time when battery current seriously exceeds threshold value and take corresponding measure and then influence battery life.For this purpose, the method for the present invention comprises the following steps：Obtain the real-time current value of control object；When the real-time current value exceeds current threshold, the real-time current value and the difference of the current threshold are calculated；Calculate integration of the difference to the time；Whether the electric current for judging the control object according to the result of the integration transfinites.Can judge whether exceed integral threshold in the cumulant short time more than the electric current of current threshold exactly by the method for the present invention; and then take appropriate measures reduces real-time current value in time; so as to protect the battery from the infringement of surge current, the service life of battery is extended.
Description
Technical field
The invention belongs to current control field, a kind of dynamic current control method and system are specifically provided.
Background technology
In the battery management system of New-energy electric vehicle, when system more than present battery for a long time to be allowed most
During big charging and discharging currents discharge and recharge, battery life can be seriously damaged, even the danger such as battery bag short-circuit fire can be caused when serious,
Therefore need to be monitored the charging and discharging currents of battery system and early warning when more than permissible value.
In the prior art, it is generally pre- using being carried out beyond the early warning mechanism of current threshold for a period of time to battery system
It is alert, it is pre- to battery system specially after battery system current value (various excessive current values) exceedes setting value for a period of time
It is alert.But, the early warning mechanism often in electric current seriously beyond threshold value when short circuit (such as load occur) when can not early warning in time, lead
Cause momentary surges current versus cell to cause irreversible infringement, have a strong impact on the service life of battery.
Correspondingly, this area needs a kind of new battery current super-limit prewarning method to solve the above problems.
The content of the invention
In order to solve above mentioned problem of the prior art, being the method for early warning that transfinites of the existing battery current of solution can not
The problem of early warning being made when battery current seriously exceeds threshold value in time and takes corresponding measure and then influence battery life, this hair
Bright to provide a kind of dynamic current control method, this method comprises the following steps：Obtain the real-time current value of control object；Work as institute
When stating real-time current value beyond current threshold, the real-time current value and the difference of the current threshold are calculated；Calculate the difference
It is worth the integration to the time；Whether the electric current for judging the control object according to the result of the integration transfinites.
In the optimal technical scheme of the above method, " electric current of the control object is judged according to the result of the integration
Whether transfinite " the step of further comprise：The result of the integration and integral threshold are compared；When the result of the integration
During beyond the integral threshold, judging the electric current of the control object transfinites.
In the optimal technical scheme of the above method, methods described also includes：When the electric current for judging the control object surpasses
In limited time, control measure are taken, the real-time current value is reduced, until the result of the integration is zero.
In the optimal technical scheme of the above method, the control object is battery, described " to obtain the real-time of control object
The step of current value ", further comprises：Obtain the real time charging current value or real-time discharge current value of the battery.
In the optimal technical scheme of the above method, the battery is the electrokinetic cell of electric automobile.
In the optimal technical scheme of the above method, methods described also includes：When the real-time current value exceeds the electricity
When flowing threshold value, calculate the real-time current value and continue to build up the time beyond the current threshold；And when the knot of the integration
Fruit without departing from the integral threshold but it is described continue to build up the time beyond time threshold when, take control measure, make the reality
When current value reduce, until the result of the integration is zero.
On the other hand, the invention provides a kind of dynamic current control system, system includes：Current collecting device, its
Real-time current value for acquisition control object；Controller, it communicates with the current collecting device and can receive described
The real-time current value that current collecting device is sent, when the real-time current value that the current collecting device is collected exceeds electric current
During threshold value, the controller performs following operation：Calculate the difference of the real-time current value and the current threshold；Calculate described
Integration of the difference to the time；And judge whether the electric current of the control object transfinites according to the result of the integration.
In the optimal technical scheme of said system, the controller judges the control pair by performing following operation
Whether the electric current of elephant transfinites：The result of the integration and integral threshold are compared；When the result of the integration is beyond described
During integral threshold, judging the electric current of the control object transfinites.
In the optimal technical scheme of said system, when the electric current for judging the control object transfinites, the controller
Control measure can also be taken, the real-time current value is reduced, until the result of the integration is zero.
In the optimal technical scheme of said system, the control object is battery, and the real-time current value includes described
The real time charging current value or real-time discharge current value of battery.
In the optimal technical scheme of said system, the battery is the electrokinetic cell of electric automobile.
In the optimal technical scheme of said system, when the real-time current value exceeds the current threshold, the control
Device processed can also calculate the real-time current value and continue to build up the time beyond the current threshold；And when the knot of the integration
Fruit without departing from the integral threshold but it is described continue to build up the time beyond time threshold when, the controller can also take control
Measure processed, reduces the real-time current value, until the result of the integration is zero.
It is real-time when control object it will be appreciated to those of skill in the art that in the preferred technical solution of the present invention
When electric current exceeds current threshold, the difference between the real-time current and current threshold is calculated, and the difference is accumulated to the time
Point, when integral result exceedes integral threshold, judging the electric current of control object transfinites, and then takes control measure to make real-time current
Value reduction, until the result of integration is zero.Further, while the real-time current of control object exceeds current threshold, start
Calculate the real-time current and continue to build up the time beyond current threshold, and when the integral result is not yet beyond integral threshold
When continuing to build up the time beyond time threshold, control measure are also taken, make the reduction of real-time current value, until the result of integration is
Zero.
As can be seen here, method of the invention can play double protection to battery, that is, pass through the method energy of the present invention
It is enough to judge whether to exceed integral threshold, and exactly sentence in the cumulant short time more than the electric current of current threshold exactly
Whether the electric current of disconnected excess of export overcurrent threshold value exceedes time threshold, so that all being taken appropriate measures when either condition is met makes
Real-time current value is reduced, and not only avoids infringement of the transient high-current to control object, while it also avoid long lasting for super
Go out the adverse effect that the situation of current threshold is caused to the performance of control object, extend the use longevity of control object (battery)
Life.
Scheme 1, a kind of dynamic current control method, it is characterised in that the described method comprises the following steps：
Obtain the real-time current value of control object；
When the real-time current value exceeds current threshold, the real-time current value and the difference of the current threshold are calculated；
Calculate integration of the difference to the time；
Whether the electric current for judging the control object according to the result of the integration transfinites.
Scheme 2, the dynamic current control method according to scheme 1, it is characterised in that " judged according to the result of the integration
Whether the electric current of the control object transfinites " the step of further comprise：
The result of the integration and integral threshold are compared；
When the result of the integration exceeds the integral threshold, judging the electric current of the control object transfinites.
Scheme 3, the dynamic current control method according to scheme 2, it is characterised in that methods described also includes：When judgement institute
When stating the electric current of control object and transfiniting, control measure are taken, the real-time current value is reduced, until the result of the integration is
Zero.
Scheme 4, the dynamic current control method according to scheme 3, it is characterised in that the control object is battery, described
The step of " the real-time current value for obtaining control object ", further comprises：Obtain the real time charging current value or real-time of the battery
Discharge current value.
Scheme 5, the dynamic current control method according to scheme 4, it is characterised in that the battery is the power of electric automobile
Battery.
Scheme 6, the dynamic current control method according to any one of scheme 2 to 5, it is characterised in that methods described is also wrapped
Include：
When the real-time current value exceeds the current threshold, the real-time current value holding beyond the current threshold is calculated
Continuous accumulated time；And
When the integration result without departing from the integral threshold but it is described continue to build up the time beyond time threshold when, take
Control measure, reduce the real-time current value, until the result of the integration is zero.
Scheme 7, a kind of dynamic current control system, it is characterised in that the system includes：
Current collecting device, it is used for the real-time current value of acquisition control object；
Controller, its communicated with the current collecting device and can receive that the current collecting device sends it is described in real time
Current value,
When the real-time current value that the current collecting device is collected exceeds current threshold, the controller performs following behaviour
Make：Calculate the difference of the real-time current value and the current threshold；Calculate integration of the difference to the time；And according to institute
The result for stating integration judges whether the electric current of the control object transfinites.
Scheme 8, the dynamic current control system according to scheme 7, it is characterised in that the controller is by performing following behaviour
Make to judge whether the electric current of the control object transfinites：
The result of the integration and integral threshold are compared；
When the result of the integration exceeds the integral threshold, judging the electric current of the control object transfinites.
Scheme 9, the dynamic current control system according to scheme 8, it is characterised in that when the electric current for judging the control object
When transfiniting, the controller can also take control measure, reduce the real-time current value, until the result of the integration is
Zero.
Scheme 10, the dynamic current control system according to scheme 9, it is characterised in that the control object is battery, described
Real-time current value includes the real time charging current value or real-time discharge current value of the battery.
Scheme 11, the dynamic current control system according to scheme 10, it is characterised in that the battery is the dynamic of electric automobile
Power battery.
Scheme 12, the dynamic current control system according to any one of scheme 8 to 11, it is characterised in that when described real-time
When current value exceeds the current threshold, the controller can also calculate the real-time current value beyond the current threshold
Continue to build up the time；And
When the integration result without departing from the integral threshold but it is described continue to build up the time beyond time threshold when, it is described
Controller can also take control measure, reduce the real-time current value, until the result of the integration is zero.
Brief description of the drawings
Fig. 1 is the step flow chart of the dynamic current control method of the present invention；
Fig. 2 is the first schematic diagram that the method according to the invention is transfinited based on current integration threshold decision electric current；
Fig. 3 is that the method according to the invention judges the second schematic diagram that electric current transfinites based on current integration threshold cycle；
Fig. 4 is that the method according to the invention judges schematic diagram of the current integration threshold value prior to time threshold when electric current transfinites；
Fig. 5 is that the method according to the invention judges schematic diagram of the time threshold prior to current integration threshold value when electric current transfinites.
Embodiment
The preferred embodiment of the present invention described with reference to the accompanying drawings.It will be apparent to a skilled person that this
A little embodiments are used only for explaining the technical principle of the present invention, are not intended to limit protection scope of the present invention.For example, although
Specification is illustrated with the electric discharge of battery, however, it will be apparent that the method for the present invention is equally applicable to the charging of battery
The current control of process and other objects, those skilled in the art can make adjustment to it as needed, to adapt to tool
The application scenario of body.The adjustment of this control object does not change the general principle of the present invention, therefore falls within the present invention
Protection domain within.
As shown in figure 1, the dynamic current control method of the present invention includes：Step S100, obtains the real-time electricity of control object
Flow valuve；Step S200, when real-time current value exceeds current threshold, calculates real-time current value and the difference of current threshold, and select
Calculate to selecting property real-time current value and continue to build up the time beyond current threshold；Step S300, calculates product of the difference to the time
Point, whether the electric current for judging control object according to the result of integration transfinites；And control object is judged according to the time of continuing to build up
Electric current whether transfinite.
Specifically, by taking battery discharge as an example, in the step s 100, by current collecting device, (for example Hall current is sensed
Device, Rogowski current sensor etc.) obtain battery real-time discharge current value, i.e., the instantaneous value that electric current is changed over time.
As an example, the battery is the electrokinetic cell of electric automobile, or those skilled in the art as needed can also send out this
Bright dynamic current control method is applied to other kinds of battery, such as mobile phone charge pal.In addition, current collecting device is not
It is limited to above-named type, as long as the discharge current value of battery can be gathered in real time, it can use any appropriate form.
Specifically, in step s 200, first, current threshold is obtained, what is obtained to judge in step S100 puts in real time
Whether electric current (describing real-time discharge current referred to as real-time current for convenience hereafter) transfinites, and influences the use longevity of battery
Life.The current threshold can be obtained by repetition test or mathematical modeling, or can also be by user's sets itself as needed.
Then, when real-time current value exceeds current threshold, the real-time current value and the difference of current threshold are calculated.Meanwhile, when real-time
When current value exceeds current threshold, method of the invention also calculates real-time current value and continues to build up the time beyond current threshold.
As described above, the benefit that two ways is run neck and neck is both to have avoided the infringement of transient high-current, it also avoid electric current it is long when
Between the micro infringement caused of transfiniting.
Specifically, in step S300, on the one hand, time will be integrated in the step S200 differences obtained.Then,
Judge whether electric current transfinites according to integral result.When the result of integration exceeds the integral threshold of electric current, Cutoff current transfinites；When
The result of integration without departing from electric current integral threshold when, Cutoff current does not transfinite.Further, when electric current transfinites, control is taken
Measure makes the reduction of real-time current value, until the result of integration is zero.The control measure can be specifically, by being arranged on cell tube
Controller or nonshared control unit in reason system make the reduction of real-time current value.Certainly, the need for according to concrete application scene, the control
Measure processed can also be other any appropriate forms, as long as can make the reduction of real-time current value.
On the other hand, beyond integral threshold but the time not yet is continued to build up beyond time threshold in the result of integration
When, method of the invention also takes control measure to make the reduction of real-time current value, until the result of integration is zero.Similarly, the control
Measure can also be specifically any appropriate form, as long as can make the reduction of real-time current value, such as by being arranged on electricity
Controller or nonshared control unit in the management system of pond make the reduction of real-time current value.
Similar with above-mentioned current threshold, time threshold and the current integration threshold value can be by testing or mathematical modeling repeatedly
, can also be by user's sets itself as needed to obtain.The acquisition modes of the threshold value should not be to protection scope of the present invention
Constitute any limitation.
It will be appreciated to those of skill in the art that the method for the present invention can play double protection to battery.Tool
Body, by calculating the difference of real-time current value and current threshold, and by result and integral threshold of the difference to time integral
The method (judgment mode one) being compared can be when real-time current value (when electric current is larger) exceedes current threshold to cell tube
Reason system feedback electric current transfinites signal, makes current reduction, prevents high current from transfiniting for a long time (in time threshold) influence battery longevity
Life；The time is continued to build up by calculating real-time current value beyond current threshold, and will continue to build up the time to enter with time threshold
The method (judgment mode two) that row compares can be when real-time current value (when electric current is smaller) exceedes current threshold in time to battery
Management system feedback current transfinites signal, makes current reduction, prevent the chemical material of inside battery because electric current transfinites for a long time and
Generation substance deterioration, and then influence battery life.
The dynamic current control method of the present invention is illustrated with reference to Fig. 2 to Fig. 5.
For judgment mode one, as shown in Fig. 2 specifically, P (grid shadow faces between moment A and moment B in fig. 2
Product) integral threshold that electric current is allowed is measured for current dynamic, shaded area δ S1 are beyond current threshold (" threshold value " in Fig. 2)
Real-time current value and current threshold between current differential to the integration of time, be counted as just integrating i.e. δ S1 ＞ 0.Shaded area δ
S2 is product of the current differential not up between the real-time current value and current threshold of current threshold (" threshold value " in Fig. 2) to the time
Point, it is counted as the negative i.e. δ S2 ＜ 0 of integration.Wherein, current threshold can be obtained by repetition test or mathematical modeling, or by user
Sets itself；The maximum capacity change that integral threshold P can allow when being battery battery core short time (such as 20S) interior discharge and recharge
Amount, similar with current threshold, it can be obtained by repetition test or mathematical modeling, or by user's sets itself.
With continued reference to Fig. 2, δ S=δ S1+ δ S2, δ S=∫ (real-time current value-current threshold) dt.Further, when real-time electricity
When flow valuve is more than current threshold, i.e. during δ S=δ S1 >=P (moment B in such as Fig. 2), Cutoff current transfinites, controller control battery
Electric discharge real-time current value is reduced to below current threshold, until δ S=0.
As shown in figure 3, real-time current value exceedes current threshold in moment A, start to be integrated computing to current differential.
During due in B, δ S=δ S1=P, continuity δ S=δ S1 over time will be more than P, so Cutoff current surpasses at moment B
Limit, the discharge current value of battery is reduced by controller.In moment C, δ S=δ S1+ δ S2=0, i.e., between moment A and moment C
Hatched area can cancel out each other, now δ S are no longer integrated calculating, its value be 0.Until real-time current value is again
During more than current threshold, δ S restart to calculate again.
With continued reference to Fig. 3, in moment D, real-time current value reaches current threshold again, and now δ S=δ S3 restart
Integral and calculating.From Fig. 3 clearly it can be seen that, although in moment E, δ S have not exceeded integral threshold P, but real-time current
Value begins to reduction, and the situation is due to that cell output current demand (demand power of battery service object) reduction is caused.
Because in this kind of situation, δ S not yet reach integral threshold P, so those skilled in the art can also be less than in real-time current value
During current threshold, return-to-zero just is carried out to δ S, until being integrated again to δ S when real-time current value is again above current threshold
Computing.Or those skilled in the art can also do other processing to δ S as needed, as long as will not be to real-time current value again
Integral operation result δ S during more than current threshold are impacted.
Illustrate the control mode of the present invention below by Fig. 4 and Fig. 5 is compared.As shown in figure 4, in moment B (period δ t
It is interior) δ S=δ S1=P, and real-time current value is not up to time threshold T beyond lasting cumulative time of current threshold.So,
Now transfinited (i.e. judgment mode one) come Cutoff current by current threshold integration, controller control output current decreases up to δ S
=0.Or, return-to-zero just can also be carried out to δ S when real-time current value is less than current threshold, until real-time current value is again
It is secondary that computing is integrated to δ S again beyond current threshold.
Referring next to Fig. 5, as shown in Figure 5, although the δ S=δ S1 ＜ P between moment A and moment B (in period T), but
It is that real-time current value has met and exceeded time threshold T beyond the lasting cumulative time of current threshold.So now passage time
Threshold value T Cutoff currents transfinite (i.e. judgment mode two), and controller control output current decreases up to δ S=0.Similarly, can also
Return-to-zero just is carried out to δ S when real-time current value is less than current threshold, until real-time current value exceeds current threshold again again
Computing is integrated to δ S.
It will be appreciated to those of skill in the art that Fig. 2 is to being not limited only to above-mentioned battery discharge shown in Fig. 5, its
It can also be that battery charges.Further, the control of the size of real-time current value is not limited only to battery management system, can also be
Other dedicated control systems or device.Further, the service object of electric current is also not limited to battery, can also be other to electricity
System or device that stream is required, for example, motor, PLC etc..
In summary, dual protection can be played to battery by the method for the present invention, that is, passes through the method for the present invention
Can judge whether exceed integral threshold in the cumulant short time more than the real-time current value of current threshold exactly, and
Judge exactly more than current threshold real-time current value for a long time in whether more than time threshold, and then take and arrange accordingly
Applying makes the reduction of real-time current value, so as to protect battery, extends the service life of battery.
Although in addition, being not shown in the drawings, the present invention also provides a kind of dynamic current control system.The system is mainly wrapped
Include current collecting device and controller.Wherein, current collecting device is used to gathering the real-time current value of battery, and controller can be with
Current collecting device is communicated, and controller is used for the real-time current value for receiving current collecting device transmission.Further, controller
Following operation can also be performed：When the real-time current value of battery is more than current threshold, real-time current value and current threshold are calculated
Between difference, and calculate integration of the difference to the time；When integral result exceeds the integral threshold of electric current, Cutoff current surpasses
Limit, and then take control measure to reduce the real-time current value of battery, until integral result is zero.On the other hand, when battery
When real-time current value is more than current threshold, controller also calculates real-time current value and continues to build up the time beyond current threshold；And
And when integral result without departing from integral threshold but continue to build up the time beyond time threshold when, Cutoff current transfinites, and then takes
Control measure reduce the real-time current value of battery, until integral result is zero.
As mentioned above it is possible, the current collecting device and controller can both be realized by existing system or device,
Special device can be arranged to, as long as their energy coordination with one another are grasped to complete various collections recited above and control
Work.
So far, combined preferred embodiment shown in the drawings describes technical scheme, still, this area
Technical staff is it is easily understood that protection scope of the present invention is expressly not limited to these embodiments.Without departing from this
On the premise of the principle of invention, those skilled in the art can make equivalent change or replacement to correlation technique feature, these
Technical scheme after changing or replacing it is fallen within protection scope of the present invention.
Claims (10)
1. a kind of dynamic current control method, it is characterised in that the described method comprises the following steps：
Obtain the real-time current value of control object；
When the real-time current value exceeds current threshold, the real-time current value and the difference of the current threshold are calculated；
Calculate integration of the difference to the time；
Whether the electric current for judging the control object according to the result of the integration transfinites.
2. dynamic current control method according to claim 1, it is characterised in that " judged according to the result of the integration
Whether the electric current of the control object transfinites " the step of further comprise：
The result of the integration and integral threshold are compared；
When the result of the integration exceeds the integral threshold, judging the electric current of the control object transfinites.
3. dynamic current control method according to claim 2, it is characterised in that methods described also includes：When judgement institute
When stating the electric current of control object and transfiniting, control measure are taken, the real-time current value is reduced, until the result of the integration is
Zero.
4. dynamic current control method according to claim 3, it is characterised in that the control object is battery, described
The step of " the real-time current value for obtaining control object ", further comprises：Obtain the real time charging current value or real-time of the battery
Discharge current value.
5. dynamic current control method according to claim 4, it is characterised in that the battery is the power of electric automobile
Battery.
6. the dynamic current control method according to any one of claim 2 to 5, it is characterised in that methods described is also wrapped
Include：
When the real-time current value exceeds the current threshold, the real-time current value holding beyond the current threshold is calculated
Continuous accumulated time；And
When the integration result without departing from the integral threshold but it is described continue to build up the time beyond time threshold when, take
Control measure, reduce the real-time current value, until the result of the integration is zero.
7. a kind of dynamic current control system, it is characterised in that the system includes：
Current collecting device, it is used for the real-time current value of acquisition control object；
Controller, its communicated with the current collecting device and can receive that the current collecting device sends it is described in real time
Current value,
When the real-time current value that the current collecting device is collected exceeds current threshold, the controller performs following behaviour
Make：Calculate the difference of the real-time current value and the current threshold；Calculate integration of the difference to the time；And according to institute
The result for stating integration judges whether the electric current of the control object transfinites.
8. dynamic current control system according to claim 7, it is characterised in that the controller is by performing following behaviour
Make to judge whether the electric current of the control object transfinites：
The result of the integration and integral threshold are compared；
When the result of the integration exceeds the integral threshold, judging the electric current of the control object transfinites.
9. dynamic current control system according to claim 8, it is characterised in that when the electric current for judging the control object
When transfiniting, the controller can also take control measure, reduce the real-time current value, until the result of the integration is
Zero.
10. dynamic current control system according to claim 9, it is characterised in that the control object is battery, described
Real-time current value includes the real time charging current value or real-time discharge current value of the battery.
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| CN109546238A (en) * | 2018-11-01 | 2019-03-29 | 东软睿驰汽车技术（沈阳）有限公司 | A kind of method and device controlling the power of battery |
| CN109823229A (en) * | 2019-01-31 | 2019-05-31 | 上海蔚来汽车有限公司 | Power battery Poewr control method, device, system and vehicle |
| CN117022046A (en) * | 2023-10-09 | 2023-11-10 | 中煤科工(上海)新能源有限公司 | Battery power state adjusting method based on real-time feedback |
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