CN103185863A - Estimation method and system of battery electricity preparation time under condition of varying loading - Google Patents
Estimation method and system of battery electricity preparation time under condition of varying loading Download PDFInfo
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Abstract
The invention relates to an estimation method of battery electricity preparation time under the condition of varying loading, a corresponding estimation device, and a power system with the estimation device. The method takes influence of the varying loading into consideration, and estimation of the power preparation time is accurate. The supportive maximum discharging multiplying power and power can be computed before the varying loading, and therefore computer crash can be avoided. Due to the fact that the estimation method adopted for the discharging multiplying power is of certain generality, correct pre-estimation can be carried out while the specific specification of batteries usually does not need to be considered.
Description
Technical field
The present invention relates to a kind of evaluation method of battery backup time, especially, relate to evaluation method and the corresponding system of battery backup time under the varying duty situation.
Background technology
Charging time refers to the continuous working period of battery under a fixed load.The charging time prediction is one of Core Feature of backup power system battery management, is directly connected to reliability and the availability of system, and for important power-supply system, the prediction of charging time is particularly important.Tradition charging time Forecasting Methodology deposits discharge current and time relationship table or power and corresponding time relationship table in system, and some advanced methods also can add some capacity and time correction factor, and the situation that remains unchanged for load is can fundamental forecasting accurate.But in actual application, because may there be the second defencive function in some power-supply devices, or there is situation such as load in the use in the client, that is to say the unalterable situation of not necessarily load that power-supply device is faced.Under this situation, traditional charging time prediction scheme is not because to analyzing and researching before and after the load variations, so often bigger deviation can occur for estimating of charging time, affects for the reliability of system.
Specifically, in backup power system, the Forecasting Methodology of battery backup time is normally by the permanent power discharge tables of data of the battery of the specific standard that prestores, the remaining charging time of mode estimating battery with interpolation or extrapolation computation of table lookup, but this charging time Forecasting Methodology has two deficiencies, the one, the estimation of residue charging time is relevant with the battery of selection, and the difference of battery specification can cause the inaccurate of estimation, makes that the versatility of method is not strong; The 2nd, if battery user load in discharge process changes, then can the guiding discharge multiplying power change, because discharge starting point and tables of data are variant, so easily cause the residue charging time of estimation inaccurate.Below by two examples this problem is described:
Example 1: discharge process becomes heavy load by little load:
New battery begins to increase load battery discharge current is brought up to 5C with after the 1C discharge 80% after being full of electricity, and how many electric weight may I ask at this moment, does battery discharge to emit with 5C?
Q＝1-0.8＝0.2
According to the common computational logic of UPS, battery can also be emitted about 20% electric weight and be come, but in fact this moment, system can very quick machine, almost can not put electric weight with the 5C discharge.If user's impact this moment is heavy load so, system can work as machine immediately, and is very unreliable.
Example 2: discharge process is by the heavy load load that diminishes:
New battery for protection important load purpose, drops to 1C with battery discharge current after being full of and beginning behind the electricity to emit 98% electric weight with 5C, may I ask this moment battery and emit how many electric weight with the 1C discharge?
Q＝1-0.98＝0.02
If calculate routinely, this moment, battery did not almost have electric weight to emit, but measured battery can also be emitted 34% electric weight.Even adopt the UPS estimation mode of present intelligent in this case, because this moment, the cell voltage saltus step was bigger, the battery backup time estimation system of UPS also is difficult to settle at one go effectively locatees the battery current state, and time and the real time of estimation also often have a long way to go.
Summary of the invention
In view of this situation, the inventor passes through in a large number to the simulated experiment of battery varying duty situation, and in conjunction with some theoretic analyses, found out system's variable load front and back discharge capacity of the cell Changing Pattern, the evaluation method of battery backup time under a kind of brand-new varying duty situation is proposed.In addition, the present invention also provides a kind of estimate maximum discharge-rate or the method for discharge power and the device of using this method after the variable load.
According to an aspect of the present invention, provide the evaluation method of battery backup time under a kind of varying duty situation, comprised the following steps:
(a) before battery begins discharge, obtain the current charged number percent W of battery;
(b) before variable load, obtain the number percent F of the electric weight that battery emitted with respect to rated capacity, and obtain battery discharge coefficient η according to the discharge current I of battery, wherein the battery discharge coefficient refers to that under different discharge current conditions battery can the capacity of emitting accounts for the ratio of rated capacity;
(c) after variable load, obtain battery discharge coefficient η ' according to the discharge current I ' of battery;
(d) the residual capacity coefficient Q of battery after the calculating variable load, calculate according to following formula:
(e) the battery backup time T under the current state after the calculating variable load, calculate according to following formula:
T＝Q×T
A
Wherein, T
ABut be the discharge time of full capacity battery under present load.
Preferably, judge the step whether the variable load condition satisfies also be included in variable load in step b before, described variable load condition is that the discharge-rate after the variable load is not higher than the maximum discharge-rate that battery can be supported, wherein according to η
Max=η-(W-F) * η calculates maximum discharge-rate coefficient η
Max, and determine maximum discharge-rate thus, thereby when the variable load condition satisfies, carry out variable load, and when the variable load condition does not satisfy, do not carry out variable load.
Preferably, judge the step whether the variable load condition satisfies also be included in variable load in step b before, described variable load condition is that the discharge power after the variable load is not higher than the maximum discharge power Wb that battery can be supported, wherein according to η
Max=η-(W-F) * η calculates maximum discharge-rate coefficient η
Max, and according to Wb=M * η
Max* V calculates maximum discharge power Wb, and wherein M is the battery rated capacity, and V is the current voltage of battery, thereby when the variable load condition satisfies, carries out variable load, and when the variable load condition does not satisfy, do not carry out variable load.
Preferably, also comprise the step that judges whether varying duty, wherein when the fluctuation of load during more than or equal to preset threshold value, execution in step c, d, e, and when the fluctuation of load during less than preset threshold value, according to default discharge current and time relationship table or power and the direct estimating battery charging time of corresponding time relationship table.
Preferably, when battery is worked, behind the load variations certain hour, obtain battery discharge coefficient η ' under permanent power discharge pattern.
Preferably, the described time is selected according to battery specifications and models and discharge power size, make battery under identical discharge time and cut-off voltage condition, permanent power discharge pattern value electric current and constant current mode electric current differ very little, and guarantee in time to calculate the charging time of battery after the variable load.
Preferably, T wherein
ABy default discharge current and time relationship table or power and the calculating of corresponding time relationship table, or by following experimental formula calculating:
T
A=M * η * 60/I, unit be minute, and wherein M is the battery rated capacity, and the AH of unit, I are discharge current, and the A of unit, η are the battery discharge coefficient.
Said method of the present invention can be realized by the functional module of computer program or corresponding function.Therefore, according to another aspect of the present invention, provide the estimating device of battery backup time under a kind of varying duty situation, comprising:
Be used for obtaining before battery begins to discharge the device of the current charged number percent W of battery;
Be used for before variable load, obtaining the device of the number percent F of the electric weight that battery emitted with respect to rated capacity, and the device that is used for obtaining according to the discharge current I of battery battery discharge coefficient η, wherein the battery discharge coefficient refers to that under different discharge current conditions battery can the capacity of emitting accounts for the ratio of rated capacity;
Be used for after variable load, obtaining according to the discharge current I ' of battery the device of battery discharge coefficient η ';
For the device of the residual capacity coefficient Q of battery after the calculating variable load, described device calculates according to following formula:
For the device of the battery backup time T under the current state after the calculating variable load, described device calculates according to following formula:
T＝Q×T
A
Wherein, T
ABut be the discharge time of full capacity battery under present load.
Preferably, comprise that also described variable load condition is that the discharge-rate after the variable load is not higher than the maximum discharge-rate that battery can be supported, wherein according to η for the device of judging before variable load whether the variable load condition satisfies
Max=η-(W-F) * η calculates maximum discharge-rate coefficient η
Max, and determine maximum discharge-rate thus, thereby when the variable load condition satisfies, carry out variable load, and when the variable load condition does not satisfy, do not carry out variable load.
Preferably, comprise that also described variable load condition is that the discharge power after the variable load is not higher than the maximum discharge power Wb that battery can be supported, wherein according to η for the device of judging before variable load whether the variable load condition satisfies
Max=η-(W-F) * η calculates maximum discharge-rate coefficient η
Max, and according to Wb=M * η
Max* V calculates maximum discharge power Wb, and wherein M is the battery rated capacity, and V is the current voltage of battery, thereby when the variable load condition satisfies, carries out variable load, and when the variable load condition does not satisfy, do not carry out variable load.
According to a further aspect of the invention, provide a kind of power-supply system, it contains the estimating device of foregoing battery backup time.
The invention has the advantages that: (1) has considered the influence of varying duty, and the estimation of charging time is more accurate; (2) can calculate maximum discharge-rate and the power that to support before the variable load, prevent from working as machine; (3) because the estimation mode of employing discharge-rate has certain versatility, so the battery that does not often need to consider concrete specification can be estimated more accurately.
Description of drawings
Fig. 1 is the process flow diagram according to charging time evaluation method of the present invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with accompanying drawing, further describe principle of the present invention and application.Should be appreciated that specific embodiment described herein only in order to explaining the present invention, and be not used in restriction the present invention.
Battery discharge multiplying power and capacity relationship
The inventor discovers that battery discharge time is relevant with the cut-off voltage of discharge current and discharge, but and the discharge capacity of battery relevant with discharge current.For example, at BP7-12 type 12V7AH battery (can be commercially available from Meimei Cell Co., Ltd), table 1, table 2 liang group discharge data are arranged.
Table 1:BP7-12 constant-current discharge performance data: A (25 ℃, 77)
The table 2:BP7-12 discharge capacity of the cell time table of comparisons: A (25 ℃, 77)
Remarks: discharge coefficient is the capacity of emitting during to cut-off voltage with current current discharge and the ratio of rated capacity.
Can know that from table 1 battery discharge time is relevant with the cut-off voltage of discharge current and discharge, under identical discharge time, the more low discharge current that can support of discharge cut-off voltage is more big; Under the same breakdown voltage, discharge current is more short the more big discharge time that can support.Can know battery under identical cut-off voltage condition from table 2, the discharge current more capacity that can emit of macrocell is just more few, and the capacity that battery can be emitted under different discharge currents has larger difference, and this species diversity can see through discharge coefficient and embody.
The battery discharge coefficient
Discharge coefficient η describes the ratio that battery can the capacity of emitting under different discharges requires accounts for rated capacity, can calculate according to each specification discharge data table that battery producer provides and obtain, also can conclude to sum up according to the data of most of similar specifications of industry and draw approximate form of general use.Later a kind of method is example, and the inventor has utilized existing a large amount of constant-current discharge data fittings as table 3 data.
Table 3: universal battery discharge coefficient η
Remarks: the discharge-rate of battery adopts interpolation method to calculate under other discharge coefficient.
Need to prove, the coefficient of table 3 is that the constant-current discharge tables of data data of the compacted accumulator (capacity is less than the VRLA battery of 24AH) that provides according to different manufacturers draw, coefficient obtains the difference of the different manufacturers product of considering discharge cut-off voltage difference under the different multiplying and the similar performance of same specification, and the constant-current discharge tables of data of this specification product that can provide according to producer during practical application is calculated and obtained.
Varying duty battery backup time evaluation method
The present invention solves the inaccurate problem of the caused charging time estimation of load variations in the battery discharge procedure in conjunction with the lead-acid battery flash-over characteristic with the concept of utilizing discharge coefficient.
Battery remaining power after the variable load and charging time evaluation method
The difficult point of system's variable load volume calculation is that the state location of battery after the variable load is difficult, also causes the capacity coefficient estimation under this state to have difficulty thus, and then influences estimating of charging time, and the present invention will adopt following thinking to position calculating:
In order to simplify computation process, in the estimation of charging time, we all will have the data of unit to calculate through transferring constant to accordingly.
1) system is according to the discharge current data that detect, calculates the discharge-rate R of battery in conjunction with battery rated capacity C, tables look-up 3 to obtain discharge coefficient η before the battery variable load and the discharge coefficient η ' after the variable load.By the capacity difference that battery can be emitted before and after the variable load on formula 1 theory of computation:
C×η′-C×η (1)
C: the rated capacity of battery, Ah;
η: the battery discharge coefficient before the varying duty;
η ': the battery discharge coefficient after the varying duty.
2) obtain the capacity coefficient F (volume percent) that battery has been emitted by existing battery management system, by formula (2) computing system battery remaining electric weight also before variable load:
(W-F)×C×η (2)
W: the battery charge number percent before the discharge, value is 1 during full capacity.
F: the electric weight ratio (with respect to rated capacity) that battery has been emitted before the varying duty of starting at from the time point of W value.It is exactly to have emitted capacity coefficient F that system changes the capacity that can emit down at current year on the volume ratio that battery mode battery before the varying duty emits altogether.
Parameter W, F obtain according to existing battery management scheme by system.
3) estimate the capability value that the battery in the system also can be emitted after the variable load in conjunction with the first step second step data:
C×η′-C×η+[(W-F)×C×η] (3)
4) the capacity coefficient Q that battery can discharge after the calculating variable load:
Simplifying above-mentioned formula gets:
5) according to the capacity coefficient Q after the variable load, the charging time estimation system that coupling system is provided for oneself, the charging time T of computing system battery after variable load:
T＝Q×T
A (6)
T
A: but the full capacity battery was current year following discharge time;
T: but time of battery power backup under the current state after the variable load.
T wherein
AData can calculate by existing battery management scheme and obtain, can calculate according to constant-current discharge performance data table interpolation as shown in table 1, or rule of thumb formula is calculated.For example:
Look-up method.The constant-current discharge data (referring to table 1) of the BP7-12 size battery that provides with Meimei Cell Co., Ltd, if current battery discharge current is 33.7A, discharge cut-off voltage is 1.65V/cell, corresponding T
AValue be exactly 5min.
Experimental formula.If the battery rated capacity is M (AH), discharge current I (A), discharge coefficient η, then this formula table is shown T
A=M* η * 60/I (min).
For example the battery rated capacity is 7AH, and known present discharge current 33.7A knows that according to battery discharge current and rated capacity information this battery discharge coefficient is 0.4, the battery backup time that just can obtain according to following experimental formula:
T
A＝7*0.4/33.7*60＝4.99min
Thus, can obtain battery backup time after the variable load according to formula 6.
The maximum load variation amount estimation that can carry:
Under battery mode, because battery behavior when little load factor is changeed the discharge of heavy load rate, because the capacity that can emit reduces, may directly cause working as machine under some situation.For the safeguards system power supply safety, provide corresponding judgment standard according to some results of actual measurement, and the charge capacity of the maximum that can carry according to this base estimation current battery state.
Benchmark judgment formula (7):
(η′-η)+[(W-F)×η]＞0 (7)
According to formula (7), can know when both sides are equal sign, namely be the maximum discharge-rate coefficient value that battery can carry under the As-Is
η
max＝η-(W-F)×η (8)
η according to formula (8) calculating
MaxValue is tabled look-up and 3 can be drawn the multiplying power of the maximum discharge that battery can support under this state, extends can obtain the maximum discharge power that the current state battery can be supported by following formula (9):
Wb＝M×η
max×V (9)
M: battery rated capacity, Ah;
V: the current voltage of battery, V;
Wb: the maximum discharge power that battery can carry under the current residual capacity, be used for reminding the user, avoid maloperation, W.
Derivation under other varying duty pattern is used
Such scheme is according to the discharge coefficient under the discharge-rate of battery and this multiplying power, but the discharge capacity coefficient before and after the variable load is estimated, and then remaining charging time after the estimating battery variable load more accurately.Owing to adopt the estimation mode of discharge-rate to have certain versatility, so the battery that does not often need to consider concrete specification can be estimated more accurately.
Except constant-current discharge, also persevering power discharge pattern is more common in backup power system in the battery discharge pattern.Voltage owing to battery in the permanent power discharge process is changing always, electric current in the guiding discharge process also changes always, if thereby calculate according to table 3, the importing varying duty formula that then can not stop is estimated, can cause misunderstanding to the client, equally also can cause the import system error.
For the detailed description system at permanent power discharge mode coefficient obtain manner, use BB7-12 battery (manufacturer for Meimei Cell Co., Ltd) constant current and constant power data and explain.Table 4 is the permanent power discharge data of BB7-12 battery and table 1 constant-current discharge performance data, contrast is found: the permanent power discharge pattern value current value under identical discharge time and cut-off voltage condition and the current value difference of constant-current discharge pattern are very little, though the current value under the value electric current of choosing and the table 1 constant-current discharge characteristic equal conditions is less than normal, but it is because both values differ less, little to system's varying duty battery discharge coefficient calculations influence.Battery discharge coefficient before and after permanent power discharge pattern just can be obtained system's variable load with battery discharge stream before and after the varying duty, and then battery remaining power coefficient and charging time after the step computing system variable load.
How does system's permanent power discharge pattern value electric current obtain? because battery is in permanent power discharge pattern, electric current all is to change along with the voltage of battery, and the discharge coefficient that electric current is related to before and after the varying duty obtains.So permanent power discharge pattern value electric current value time point is very important, the value time, too early electric current was too little, strengthened the error that discharge coefficient is calculated in varying duty, and the value time is incured loss through delay the system backup Time Calculation too late.The current value value time can be chosen the suitable time according to battery specifications and models and discharge power size in practice, allow battery under identical discharge time and cut-off voltage condition as far as possible, permanent power discharge pattern value electric current and constant current mode electric current differ very little, and the system that will guarantee can in time calculate the preparation time of battery after the variable load.Be example with the BB7-12 size battery, the time of the value electric current setting of this each power of model sees Table 5.
The permanent power discharge property list of table 4:BP7-12: Watt (25 ℃, 77)
Permanent each the grade discharge current value timetable of power discharge of table 5:BP7-12
| Discharge power | W≥166W | 56.3W≤W＜166W | 14.15W≤W＜56.3W | W＜14.15W |
| Value time/s | 4 | 8 | 15 | 60 |
The power of the discharge of remarks: W when to be that battery is actual use
System's varying duty battery backup time computational logic
Because some resistive capacitive features of load, the load of system can not guarantee it is unalterable, also have reason such as battery behavior to consider, just identification system is in the situation of varying duty when this fluctuation that can define load surpasses certain threshold value (for example 5%), just enables the varying duty computing formula under this situation.Introduce in front, the difference of battery discharge pattern just can be variant obtaining of discharge coefficient, and the battery power backup computational logic after system's variable load is identical.As a non-restrictive example, below with reference to the process flow diagram of Fig. 1, come introducing system varying duty battery backup time computational logic with the constant-current discharge pattern:
Step 100: obtain battery discharge coefficient η before system's variable load according to the discharge current of battery;
Step 200: with reference to primitive decision formula (7), can support maximum discharge-rate or discharge power according to capacity and current discharge coefficient calculating battery that the battery in the present system has been emitted, the system that prevents misoperation of users and cause works as machine, improves the power supply reliability of system;
Step 300: according to system the condition of varying duty is set, judges the whether varying duty discharge of battery in the system.For being judged as varying duty more than or equal to 5% o'clock, the fluctuation of load discharges among Fig. 1.If no, system's method routinely removes to predict the battery backup capacity, and this conventional method refers to that those do not consider battery backup time varying duty Calculation Method.Wherein the most frequently usedly draw the battery backup time according to battery discharge power or electric current computation of table lookup exactly, also can be to be similar to T
AThe formula of experimental formula obtains the battery backup time;
Step 400: after the detection system varying duty, obtain the electric weight number percent F that the preceding battery of variable load has been emitted;
Step 500: obtain discharge coefficient η ' after the variable load according to battery discharge current after system's variable load;
Step 600: the residual capacity coefficient Q of battery after the variable load calculates in system according to formula (5);
Step 700: but the full capacity battery obtained at T current year following discharge time
A, and according to the battery backup time T after formula (6) the calculating variable load.
Above-mentioned steps only is one of preferred forms of the present invention, those skilled in the art can understand under some situation, some steps are omissible, for example are used for judging the step 200 of maximum discharge-rate or discharge power, are used for judging the step 300 of varying duty condition.
By foregoing description, the inventor advances checking to following three kinds of situations:
1) became big in little year and carry, for a short time putting out increased than current year big 5 times carry to cell load at 80% o'clock and discharges;
2): carrying greatly diminishes carries, and emitted 98% capacity, the cell load minimizing load littler 5 times than present load discharged in big year;
3): carrying greatly diminishes carries, and puts out 10% capacity greatly, cell load is reduced the load littler 5 times than present load discharge;
Actual the 1st kind of situation battery more originally can not put electricity, just worked as machine when carrying the machine of adding up, and utilizes algorithm of the present invention, draws current battery and can not support to put so greatly electricity, just avoided this maloperation; Situation 2 actual batteries can also be emitted 34% capacity, utilize algorithm of the present invention, are 36% but calculate the battery discharge capacity, and situation 3 batteries are actual can also emit 93% capacity, and utilizing algorithm of the present invention to calculate can the capacity of emitting be 93.2%.Result and the result calculated consistance of example test are very high, thereby have verified the practical of scheme.
Should be noted that and understand, under the situation that does not break away from the desired the spirit and scope of the present invention of accompanying Claim, can make various modifications and improvement to the present invention of foregoing detailed description.Therefore, the scope of claimed technical scheme is not subjected to the restriction of given any specific exemplary teachings.
Claims (11)
1. the evaluation method of battery backup time under the varying duty situation comprises the following steps:
(a) before battery begins discharge, obtain the current charged number percent W of battery;
(b) before variable load, obtain the number percent F of the electric weight that battery emitted with respect to rated capacity, and obtain battery discharge coefficient η according to the discharge current I of battery, wherein the battery discharge coefficient refers to that under different discharge current conditions battery can the capacity of emitting accounts for the ratio of rated capacity;
(c) after variable load, obtain battery discharge coefficient η ' according to the discharge current I ' of battery;
(d) the residual capacity coefficient Q of battery after the calculating variable load, calculate according to following formula:
(e) the battery backup time T under the current state after the calculating variable load, calculate according to following formula:
T＝Q×T
A
Wherein, T
ABut be the discharge time of full capacity battery under present load.
2. the method for claim 1 is judged the step whether the variable load condition satisfies also be included in variable load in step b before, and described variable load condition is that the discharge-rate after the variable load is not higher than the maximum discharge-rate that battery can be supported, wherein according to η
Max=η-(W-F) * η calculates maximum discharge-rate coefficient η
Max, and determine maximum discharge-rate thus, thereby when the variable load condition satisfies, carry out variable load, and when the variable load condition does not satisfy, do not carry out variable load.
3. the method for claim 1 is judged the step whether the variable load condition satisfies also be included in variable load in step b before, and described variable load condition is that the discharge power after the variable load is not higher than the maximum discharge power Wb that battery can be supported, wherein according to η
Max=η-(W-F) * η calculates maximum discharge-rate coefficient η
Max, and according to Wb=M * η
Max* V calculates maximum discharge power Wb, and wherein M is the battery rated capacity, and V is the current voltage of battery, thereby when the variable load condition satisfies, carries out variable load, and when the variable load condition does not satisfy, do not carry out variable load.
4. the method for claim 1, also comprise the step that judges whether varying duty, wherein when the fluctuation of load during more than or equal to preset threshold value, execution in step c, d, e, and when the fluctuation of load during less than preset threshold value, according to default discharge current and time relationship table or power and the direct estimating battery charging time of corresponding time relationship table.
5. the method for claim 1 when battery is worked, behind the load variations certain hour, is obtained battery discharge coefficient η ' under permanent power discharge pattern.
6. method as claimed in claim 5, the described time is selected according to battery specifications and models and discharge power size, make battery under identical discharge time and cut-off voltage condition, permanent power discharge pattern value electric current and constant current mode electric current differ very little, and guarantee in time to calculate the charging time of battery after the variable load.
7. the method for claim 1, wherein T
ABy default discharge current and time relationship table or power and the calculating of corresponding time relationship table, or by following experimental formula calculating:
T
A=M * η * 60/I, unit be minute, and wherein M is the battery rated capacity, and the AH of unit, I are discharge current, and the A of unit, η are the battery discharge coefficient.
8. the estimating device of battery backup time under the varying duty situation comprises:
Be used for obtaining before battery begins to discharge the device of the current charged number percent W of battery;
Be used for before variable load, obtaining the device of the number percent F of the electric weight that battery emitted with respect to rated capacity, and the device that is used for obtaining according to the discharge current I of battery battery discharge coefficient η, wherein the battery discharge coefficient refers to that under different discharge current conditions battery can the capacity of emitting accounts for the ratio of rated capacity;
Be used for after variable load, obtaining according to the discharge current I ' of battery the device of battery discharge coefficient η ';
For the device of the residual capacity coefficient Q of battery after the calculating variable load, described device calculates according to following formula:
For the device of the battery backup time T under the current state after the calculating variable load, described device calculates according to following formula:
T＝Q×T
A
Wherein, T
ABut be the discharge time of full capacity battery under present load.
9. device as claimed in claim 8 comprises that also described variable load condition is that the discharge-rate after the variable load is not higher than the maximum discharge-rate that battery can be supported, wherein according to η for the device of judging before variable load whether the variable load condition satisfies
Max=η-(W-F) * η calculates maximum discharge-rate coefficient η
Max, and determine maximum discharge-rate thus, thereby when the variable load condition satisfies, carry out variable load, and when the variable load condition does not satisfy, do not carry out variable load.
10. device as claimed in claim 8 comprises that also described variable load condition is that the discharge power after the variable load is not higher than the maximum discharge power Wb that battery can be supported, wherein according to η for the device of judging before variable load whether the variable load condition satisfies
Max=η-(W-F) * η calculates maximum discharge-rate coefficient η
Max, and according to Wb=M * η
Max* V calculates maximum discharge power Wb, and wherein M is the battery rated capacity, and V is the current voltage of battery, thereby when the variable load condition satisfies, carries out variable load, and when the variable load condition does not satisfy, do not carry out variable load.
11. a power-supply system, it contains the estimating device just like one of claim 8-10 described battery backup time.
Priority Applications (1)
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| CN104505549A (en) * | 2014-12-03 | 2015-04-08 | 中国联合网络通信集团有限公司 | Method and device for judging standby time of storage battery in communication base station |
| CN104749526A (en) * | 2014-05-22 | 2015-07-01 | 佛山市新光宏锐电源设备有限公司 | Method for detecting critical failure of battery |
| CN106058343A (en) * | 2016-08-17 | 2016-10-26 | 江苏苏美达五金工具有限公司 | Battery pack having functions of tool identification and remaining work time display and electric tools |
| CN106918788A (en) * | 2017-03-20 | 2017-07-04 | 中国联合网络通信集团有限公司 | The computational methods and device of a kind of discharge power capacity factor of battery |
| CN107015151A (en) * | 2017-03-06 | 2017-08-04 | 北京航天自动控制研究所 | A kind of magnetic valve priming system battery parameter optimization method based on rocket flight state |
| CN107817449A (en) * | 2017-09-29 | 2018-03-20 | 北京大城绿川科技有限公司 | The detection method of remaining battery capacity during a kind of constant current discharge |
| CN110470995A (en) * | 2019-07-19 | 2019-11-19 | 科华恒盛股份有限公司 | Remaining battery discharge time acquisition methods, system and terminal device |
| CN112398212A (en) * | 2020-11-30 | 2021-02-23 | 南京四象新能源科技有限公司 | Standby power supply control method and device, energy storage system and storage medium |
| CN115113046A (en) * | 2022-07-14 | 2022-09-27 | 河南新太行电源股份有限公司 | Test method for rapidly evaluating maximum discharge rate of battery |
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| CN110470995A (en) * | 2019-07-19 | 2019-11-19 | 科华恒盛股份有限公司 | Remaining battery discharge time acquisition methods, system and terminal device |
| CN110470995B (en) * | 2019-07-19 | 2021-08-10 | 科华恒盛股份有限公司 | Method and system for acquiring remaining discharge time of battery and terminal equipment |
| CN112398212A (en) * | 2020-11-30 | 2021-02-23 | 南京四象新能源科技有限公司 | Standby power supply control method and device, energy storage system and storage medium |
| CN115113046A (en) * | 2022-07-14 | 2022-09-27 | 河南新太行电源股份有限公司 | Test method for rapidly evaluating maximum discharge rate of battery |
| CN115113046B (en) * | 2022-07-14 | 2022-12-16 | 河南新太行电源股份有限公司 | Test method for rapidly evaluating maximum discharge rate of battery |
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