CN103499794B - A kind of energy-storage battery Residual capacity prediction method and device - Google Patents
A kind of energy-storage battery Residual capacity prediction method and device Download PDFInfo
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Abstract
A kind of energy-storage battery Residual capacity prediction method and device. The SOC (residual capacity) of the method and device real-time estimation energy-storage battery, mainly comprises the following steps: obtain the parameters such as battery cell voltage, battery temperature, battery pack current; Ampere-hour integration real-time estimation SOCi (based on the residual capacity of electric current), history by electric current discharge and recharge ampere-hour data; And proofread and correct under given conditions estimation SOCv (based on the residual capacity of voltage) by open-circuit voltage; One of them is set to the SOC of energy-storage battery group SOCi and SOCv, and SOC and history are discharged and recharged to ampere-hour data scheduled store. Being embodied as the scheduling of energy-storage system energy provides Data support, makes full use of energy-storage battery capacity, prevents that super-charge super-discharge from occurring, and improves the objects such as battery.
Description
Technical field
The invention belongs to battery management technical field, be particularly applied to the battery management of extensive energy-storage system.
Background technology
Due to its intrinsic intermittence of the generation of electricity by new energy such as wind energy, solar energy, randomness, can to electrical network safe,Stable operation brings adverse effect. Development energy storage technology, can improve its running quality. Rationally battery management is efficientlyThe life-span of system to battery pile and the security of whole energy-storage system have vital effect.
The rise of battery management system is closely connected with the popularization of electric automobile in recent years, the battery management of electric automobileSystem mainly comprises battery protection, the estimation of battery instantaneous power, continual mileage estimation, the functions such as insulation detection. Power electricPond is applied to wind-powered electricity generation energy storage and still belongs at home the starting stage, different from electric automobile, the general required battery of energy storageMore, cost is huge, how to make full use of the capacity of energy-storage battery, and extends its service life, is energy storage projectLong-term operation and the most important thing developing.
The application, for energy-storage system energy dispatching requirement, proposes relatively more accurate, the reliable Residual capacity prediction method of oneAnd device, the SOC of real-time estimation battery pack, log history service data, makes full use of under the prerequisite of protection cell safetyBattery capacity, extends battery.
Summary of the invention
The object of the present invention is to provide a kind of accurate and practical energy-storage battery Residual capacity prediction method and device.
The application is specifically by the following technical solutions:
A kind of energy-storage battery Residual capacity prediction method, is characterized in that: described evaluation method is by measuring battery cell electricityThe parameters such as pressure, battery temperature, series battery electric current, adopt the ampere-hour integration of electric current and monomer open-circuit voltage to proofread and correct knot mutuallyThe mode of closing, the residual capacity SOCi based on battery pack current data of real-time estimation battery pack with based on batteries monomerThe residual capacity SOCv of voltage data, and one of them arranges the residue of battery pack with described SOCi and SOCvCapacity SOC; In ampere-hour integration, accumulated history discharges and recharges ampere-hour data, and regularly history is discharged and recharged ampere-hour withResidual capacity SOC inputs to memory and stores.
Further, described evaluation method specifically comprises the following steps:
(1) the battery pack residual capacity SOC initial value in read memory, and history discharges and recharges ampere-hour initial value data;
(2) by measuring the parameters such as described battery cell voltage, battery temperature, series battery electric current, obtain correspondingVoltage data, temperature data, current data;
(3) by cumulative described current data, battery pack current is carried out to ampere-hour integration, calculate based on battery pack currentThe battery pack residual capacity SOCi of data, described SOCi is set to the residual capacity SOC of battery pack, simultaneously tiredAdd history and discharge and recharge ampere-hour data;
(4) time of repose of measurement energy-storage battery, when time of repose reached after the expected time, according to the list of energy-storage batteryBulk voltage and battery temperature, obtain the battery pack residual capacity SOCv based on battery cell voltage data;
(5) judge the poor of SOCv and SOCi, in the time that described both difference is greater than the threshold value of setting, by SOCvBe set to the SOC of battery pack;
(6) periodically the history of energy-storage battery group is discharged and recharged to ampere-hour data, SOC write non-volatile memory.
Further, described calculating SOCi comprises the following steps:
3.1 judge battery pack current direction, and electric current is that canonical represents energy-storage battery charging, and ampere-hour integral result increases, electricityStream represents that for negative energy-storage battery discharges, and ampere-hour integral result reduces;
3.2 periodically carry out the ampere-hour integral operation of battery pack current, and the application is made as 1 by the ampere-hour integral operation cycleMillisecond:
Ah(k)＝Ah(k-1)+Ik
SOCi＝SOC0+Ah(k)/(K*Cnom)；
Wherein, Ah(k): the ampere-hour integrated value of current time; Ah(k-1): gained ampere-hour integration when last time ampere-hour integral operationValue; Ik: current current value, I when energy-storage battery chargingkFor just, I when electric dischargekFor negative; SOCi: based on battery pack currentThe battery pack residual capacity of data; SOC0: battery pack residual capacity SOC initial value; Cnom: battery rated capacity;
K: unit conversion coefficient is the number of times that completes ampere-hour integral operation in a hour, if ampere-hour integration period is 1 milliSecond, K=3600s/1ms=3600000;
It is cumulative that 3.3 periodic execution history discharge and recharge ampere-hour, and described history discharges and recharges ampere-hour and represents that energy-storage battery is from storageCan system move and start for the first time, total ampere-hour number of charge and discharge:
When energy-storage battery charging, have:
Total_In_Ah(k)＝Total_In_Ah(k-1)+Ik
Total_Ah_In＝Total_Ah_In0+Total_In_Ah(k)/K
When energy-storage battery electric discharge, have:
Total_Out_Ah(k)＝Total_Out_Ah(k-1)+Ik
Total_Ah_Out＝Total_Ah_Out0+Total_Out_Ah(k)/K
Wherein, Total_In_Ah(k): the history charging ampere-hour integrated value of current time; Total_In_Ah(k-1): went through last timeHistory charging ampere-hour integrated value when history discharges and recharges ampere-hour integration; Total_Ah_In: historical charging ampere-hour;Total_Ah_In0: historical charging ampere-hour initial value; Total_Out_Ah(k): the history electric discharge ampere-hour integrated value of current time;Total_Out_Ah(k-1): history electric discharge ampere-hour integrated value when last time, history discharged and recharged ampere-hour integration; Total_Ah_Out:Historical electric discharge ampere-hour; Total_Ah_Out0: historical electric discharge ampere-hour initial value; K: with the definition of K in step 3.2
Further, described SOCv calculates and comprises the following steps:
4.1 judge whether the battery standing time reaches expected time value;
4.2 reach after expected time value when time of repose, judge maximum monomer battery voltage whether interval in high electric weight orWhether minimum monomer battery voltage is in low electric weight interval;
If 4.3 meet two conditions in 4.2 simultaneously, right according to battery open circuit voltage under different temperatures and SOCShould be related to estimation SOCv.
Further, the described expected time is 120 seconds;
Described height electric weight interval 90%-100% and the 0%-10% of corresponding SOC respectively.
Further, in the time that the two difference of SOCv and SOCi is greater than 2%, using SOCv as the new SOC value of battery pack.
Further, in the situation that meeting open-circuit voltage and proofreading and correct, if high monomer voltage falls into highly charged interval, withSOC value corresponding to high monomer voltage is as the SOCv of battery pack; If minimum monomer voltage falls between low charging area,Be set to the SOCv of battery pack with SOC value corresponding to minimum monomer voltage.
Disclosed herein as well is a kind of energy-storage battery Residual capacity prediction device that uses above-mentioned residual capacity method of estimation, bagDraw together:
Monomer voltage and temperature acquisition unit, measure battery cell voltage data, temperature data, and by voltage and temperature dataBy CAN bus transfer to battery information operational part;
Battery pack current acquisition unit, measures the current data of battery pack, and passes through SCI bus transfer to battery information computingPortion;
Battery information operational part, receives monomer voltage data, temperature data, battery pack current data, carry out SOCi withSOCv estimation, and described SOCi and SOCv one of them be set to the SOC of battery pack and cumulative historyDischarge and recharge ampere-hour, control the read-write of battery information storage part;
Battery information storage part, SOC and the history of real-time storage battery pack discharge and recharge ampere-hour.
Further, described monomer voltage and temperature acquisition unit mainly comprise LT6802-2 reserve battery managing chip, tableMounted thermistor, the MCU1 that reads monomer voltage and temperature data, CAN communication interface.
LT6802-2 transfers to MCU1 by the monomer voltage of measurement and temperature data by spi bus;
MCU1 by CAN communication by monomer voltage and temperature data uploading to battery information operational part;
Surface-mount type thermistor is fixed on battery electrode column place.
Further, described battery pack current acquisition unit, mainly comprises two-way Hall current sensor, current signal conditioningCircuit, current signal reading processor MCU2.
Two-way Hall current sensor is serially connected with total anode of battery pack, according to sense of current difference, and exportable bidirectional analogVoltage;
The analog voltage amount travel direction judgement of current signal conditioning circuit to two-way Hall current sensor output, output sideTo signal to MCU2, and by accessing MCU2 after the positive analog voltage amount filtering of two-way Hall current sensor output, negativeAfter the anti-phase and filtering of analog voltage amount, access MCU2;
Current signal reading processor MCU2 reads above-mentioned current direction signal, judges the sense of current, and by two-wayThe analog voltage amount of Hall current sensor output carries out AD conversion, calculates current value, cumulative battery current value in real time,Periodically current value and current value accumulation result are passed through to the processor of SCI bus transfer to battery information operational partMCU3. Transfer to after MCU3 in every primary current accumulation results, the electric current accumulation results in MCU2 is cleared.
Further, described battery information operational part comprises battery information arithmetic processor MCU3, CAN communication interface.
The current value that the monomer voltage that MCU3 reception MCU1 uploads and temperature data, MCU2 upload and electric current accumulationValue. By cumulative current data, the SOCi of estimating battery group; Judge time of repose, according to monomer voltage and temperature,The SOCv of estimating battery group, finally by one in described SOCi and SOCv SOC that is set to battery pack.
Further, described battery information operational part, in carrying out SOC estimation, carries out history and discharges and recharges ampere-hourCumulative, and described history is discharged and recharged to ampere-hour and SOC writes battery information storage part.
Further, described battery information storage part is FM3164 by model nonvolatile memory and peripheral circuit thereofForm.
The processor MCU 3 of battery information operational part reads and writes above-mentioned nonvolatile memory by iic busOperation.
The application has following beneficial effect:
Adopt ampere-hour integration, the residual capacity of real-time estimation energy-storage system, history discharges and recharges data. Make full use of battery quietPut the time, the simple and direct open-circuit voltage of realizing is proofreaied and correct, and reduces the estimation error that ampere-hour integration brings, and improves SOC estimation essenceDegree. Finally, for the energy scheduling of energy-storage system provides reliable Data support, make full use of the capacity of energy-storage battery.
Brief description of the drawings
Fig. 1 is the application's energy-storage battery Residual capacity prediction method flow schematic diagram;
Fig. 2 is the application's energy-storage battery Residual capacity prediction apparatus structure schematic diagram;
Fig. 3 is two-way Hall current sensor output signal processing circuit.
Detailed description of the invention
Detailed with reference to the accompanying drawings explanation embodiments of the present invention below:
As shown in Figure 1, be the application's energy-storage battery Residual capacity prediction method flow schematic diagram, energy-storage battery residual capacityEvaluation method comprises following step:
1. the SOC initial value and the history that read energy-storage battery discharge and recharge ampere-hour initial value, read continuously three times, and reading result is enteredRow judgement, if three times come to the same thing, enters next step, otherwise again reads initial value.
2. the monomer voltage of cycle detection energy-storage battery group, temperature, battery pack current.
3. judge electric current, as battery pack current non-zero, carry out ampere-hour integration, the battery of estimation based on battery pack current dataGroup residual capacity SOCi, and by SOCi assignment to battery pack residual capacity SOC, history is discharged and recharged to ampere-hour simultaneously and entersRow is cumulative. Specific formula for calculation is as follows:
Ah(k)＝Ah(k-1)+Ik
SOCi＝SOC0+Ah(k)/(K*Cnom)；
Total_In_Ah(k)＝Total_In_Ah(k-1)+Ik(I>0)
Total_Ah_In＝Total_Ah_In0+Total_In_Ah(k)/K(I>0)
Total_Out_Ah(k)＝Total_Out_Ah(k-1)+Ik(I<0)
Total_Ah_Out＝Total_Ah_Out0+Total_Out_Ah(k)/K(I<0)
Ah(k)The ampere-hour integrated value of-current time
Ah(k-1)Gained ampere-hour integrated value when-last time ampere-hour integral operation
Ik-current current value, I when energy-storage battery chargingkFor just, I when electric dischargekFor negative
The battery pack residual capacity of SOCi-based on battery pack current data;
SOC0-battery pack residual capacity SOC initial value
Cnom-battery rated capacity
K: unit conversion coefficient is the number of times that completes ampere-hour integral operation in a hour, if ampere-hour integration period is 1 milliSecond, K=3600s/1ms=3600000;
Total_In_Ah(k)The history charging ampere-hour integrated value of-current time
Total_In_Ah(k-1)History charging ampere-hour integrated value when-last time, history discharged and recharged ampere-hour integration
Total_Ah_In-history charging ampere-hour
Total_Ah_In0-history charging ampere-hour initial value
Total_Out_Ah(k)The history electric discharge ampere-hour integrated value of-current time
Total_Out_Ah(k-1)History electric discharge ampere-hour integrated value when-last time, history discharged and recharged ampere-hour integration
Total_Ah_Out-history electric discharge ampere-hour
Total_Ah_Out0-history electric discharge ampere-hour initial value;
4. if battery pack current is zero, starts timing and judge the battery standing time, carrying out the monomer open-circuit voltage of SOCProofread and correct, the battery pack residual capacity SOCv of estimation based on voltage data, specific as follows:
Reach after 120 seconds when the battery standing time, judge each monomer voltage of energy-storage battery group, when there being cell to fall intoWhen high or low electric weight is interval, according to the SOCv of the temperature of battery and monomer voltage estimating battery group. The following table is certain brandThe corresponding relation of open-circuit voltage and SOC under LiFePO4 cell different temperatures:
| SOC | Normal temperature | 60℃ | 0℃ |
| 100％ | 3.406V | 3.381V | 3.371V |
| 90％ | 3.379V | 3.335V | 3.335V |
| 80％ | 3.336V | 3.334V | 3.332V |
| 70％ | 3.335V | 3.308V | 3.305V |
| 60％ | 3.309V | 3.302V | 3.292V |
| 50％ | 3.297V | 3.301V | 3.289V |
| 40％ | 3.294V | 3.290V | 3.286V |
| 30％ | 3.270V | 3.259V | 3.268V |
| 20％ | 3.237V | 3.231V | 3.234V |
| 10％ | 3208V | 3.198V | 3.206V |
| 0％ | 2.774V | 2.768V | 2.747V |
The open-circuit voltage of cell refers to that the external voltage of battery removes the voltage after ohm voltage drop and polarizing voltage, weMethod and device approach the open-circuit voltage of battery by the external voltage after battery standing a period of time.
And the open-circuit voltage of described battery and cell be the SOC of lithium ion single battery particularly, between charging areaHeight interval with low interval in, there is more linear corresponding relation. Highly charged interval of the present invention is made as 90%-100%,Between low charging area, be made as 0%-10%.
In addition, the SOC of battery pack and the SOC of cell distinguish to some extent. In highly charged interval, in order to prevent batteryIn group, occur the monomer overcharging, the SOC of battery pack should proofread and correct as SOC corresponding to high monomer voltage; Low chargedInterval, in order to prevent from occurring in battery pack the monomer of overdischarge, the SOC of battery pack should proofread and correct as minimum monomer voltage pairThe SOC answering. Concrete updating formula is as follows:
SOCv＝90％+(Vmax-Vsoc90％)/[(Vsoc100％-Vsoc90％)/10]
Or SOCv=(Vmin-Vsoc0%)/[(Vsoc10%-Vsoc0%)/10]
Vmax-high monomer voltage
Vmin-minimum monomer voltage
The monomer voltage that Vsoc100%-100%SOC is corresponding
The monomer voltage that Vsoc90%-90%SOC is corresponding
The monomer voltage that Vsoc10%-10%SOC is corresponding
The monomer voltage that Vsoc0%-0%SOC is corresponding
5. under normal circumstances, the SOC of battery pack is the SOCi of electric current ampere-hour integration gained, because current measurement exists oneFixed error, ampere-hour integral operation is constantly accumulated this error, and energy-storage battery, after multiple charge and discharge cycles, is pacifiedThe error that Shi Jifen causes makes SOC estimation result serious distortion. Therefore meeting under the condition of open-circuit voltage correction,Open-circuit voltage is proofreaied and correct result SOCv and is set to the SOC of energy-storage battery group, can effectively eliminate that ampere-hour integration bringsAccumulated error. In the application, in the time that the difference of SOCv and SOCi is greater than 2%, be set to energy-storage battery group by SOCvSOC. Meanwhile, by SOCv assignment to SOC0, as new battery pack residual capacity initial value, and when currentCarve ampere-hour integrated value Ah(k)Zero clearing, participates in the ampere-hour integral operation in next cycle.
6. periodically storage SOC discharges and recharges ampere-hour in the fixed physical address of nonvolatile memory with historical, eachWhen energy-storage system powers on, the SOC and the history that read storage discharge and recharge ampere-hour, carry out following assign operation:
SOC0＝SOC
Total_Ah_In0＝Total_Ah_In
Total_Ah_Out0＝Total_Ah_Out
By above operation, can ensure the estimation continuity of energy-storage battery residual capacity, i.e. the residual capacity number of energy-storage batteryAccording to can not be because of the maintenance of energy-storage system or unexpected power down and lose.
Be illustrated in figure 2 the application's energy-storage battery Residual capacity prediction apparatus structure schematic diagram, the energy-storage battery in the applicationResidual capacity prediction device comprises following part:
1, monomer voltage and temperature acquisition unit, comprises reserve battery managing chip LT6802-2, surface-mount type thermistor, 8Position single-chip microprocessor MCU 1, CAN communication interface.
Described LT6802-2 can complete at most the detection of 12 monomer voltages and two-way temperature, according to energy-storage batteryThe difference of series connection monomer number of battery cells of group, can flexible configuration monomer voltage and the quantity of temperature acquisition unit, each monomer electricityPress with the shared CAN bus of temperature acquisition unit and battery information operational part and carry out data communication, can realize more monomersThe monomer voltage of battery and temperature detection.
Described MCU1 is by SPI communication, controls the start and stop of LT6802-2 voltage and temperature detection, read voltage andTemperature detection result, and testing result is uploaded to battery information operational part by CAN bus.
Described thermistor is surface-mount type encapsulation, is fixed on the pole place of battery.
2, battery pack current acquisition unit, comprises two-way Hall current sensor, current signal conditioning circuit, 8 single-chip microcomputersMCU2。
As shown in Figure 3, two-way Hall current sensor is serially connected with total anode of battery pack, and output analog voltage amount is to electric currentThe direction interpretation portion of signal conditioning circuit. When charging, two-way Hall current sensor is exported positive analog voltage amount, through filteringThe AD mouth that portion inputs to MCU2 carries out analog-to-digital conversion, and current direction signal is high level, by the corresponding IO of MCU2Mouth reads; When electric discharge, two-way Hall current sensor output negative analog voltage becomes positive voltage, warp after anti-phase portionThe AD mouth that filtering portion inputs to MCU2 carries out analog-to-digital conversion, and current direction signal is low level, right by MCU2Answer IO mouth to read.
MCU2 through unit conversion, calculates the digital quantity after above-mentioned AD conversion the current value of battery pack, and carries outCumulative, regularly by SCI bus, current value and electric current accumulated value are transferred to battery information operational part.
3, battery information operational part, comprises 16 single-chip microprocessor MCU 3 and CAN communication interface.
MCU3 carries out data communication by CAN bus and at least one monomer voltage and temperature acquisition unit, receives monomerMonomer voltage and temperature data that voltage and temperature acquisition unit are uploaded, carry out SOC estimation.
The read-write operation of FM3164 by iic bus control battery information storage part, is carrying out SOC estimation, historyDischarge and recharge after ampere-hour accumulating operation, SOC and history are discharged and recharged to ampere-hour storage, and read in the time that energy-storage system powers on next timeGet SOC and history and discharge and recharge ampere-hour initial information.
For energy storage project, because the cost of energy-storage battery is huge, battery cycle of being on active service is longer, in system operation afterPhase, the actual capacity of battery will obviously be decayed. If the Cnom in Residual capacity prediction formula still adopts battery factory-said value,SOC estimation result will produce larger error. Discharge and recharge ampere-hour data according to the history recording in system, consult relevantCell degradation curve, can provide reference for the demarcation again of rated capacity.
The present patent application people has done detailed explanation and description in conjunction with Figure of description to embodiments of the invention, but abilityField technique personnel should be appreciated that, above embodiment is only the preferred embodiments of the invention, and detailed explanation is just in order to helpHelp reader to understand better spirit of the present invention, and be not limiting the scope of the invention, on the contrary, any based on thisWithin any improvement that bright invention spirit is done or modification all should drop on protection scope of the present invention.
Claims (11)
1. an energy-storage battery Residual capacity prediction method, described evaluation method is by measuring battery cell voltage, batteryTemperature, series battery current parameters, adopt the ampere-hour integration of electric current to proofread and correct with monomer open-circuit voltage the mode combining,The residual capacity SOCi based on battery pack current data of real-time estimation battery pack with based on batteries monomer voltage dataResidual capacity SOCv, and one of them arranges the residual capacity SOC of battery pack with described SOCi and SOCv;In ampere-hour integration, accumulated history discharges and recharges ampere-hour, and regularly history is discharged and recharged to ampere-hour and residual capacity SOCInputing to memory stores; It is characterized in that, described evaluation method specifically comprises the following steps:
(1) the battery pack residual capacity SOC initial value in read memory, and history discharges and recharges ampere-hour initial value;
(2), by measuring described battery cell voltage, battery temperature, series battery current parameters, obtain correspondingVoltage data, temperature data, current data;
(3) by cumulative described current data, battery pack current is carried out to ampere-hour integration, calculate based on battery pack currentThe battery pack residual capacity SOCi of data, described SOCi is set to the residual capacity SOC of battery pack, simultaneously tiredAdd history and discharge and recharge ampere-hour;
(4) time of repose of measurement energy-storage battery, when time of repose reached after the expected time, according to the list of energy-storage batteryBulk voltage and battery temperature, obtain the battery pack residual capacity SOCv based on battery cell voltage data;
4.1 judge whether the battery standing time reaches expected time value;
4.2 reach after expected time value when time of repose, judge maximum monomer battery voltage whether interval in high electric weight orWhether minimum monomer battery voltage is in low electric weight interval;
If 4.3 meet two conditions in 4.2 simultaneously, right according to battery open circuit voltage under different temperatures and SOCShould be related to estimation SOCv;
(5) judge the poor of SOCv and SOCi, in the time that described both difference is greater than the threshold value of setting, by SOCvBe set to the SOC of battery pack;
(6) the residual capacity SOC that periodically history of energy-storage battery group is discharged and recharged to ampere-hour, battery pack write non-easilyThe property lost memory.
2. energy-storage battery Residual capacity prediction method according to claim 1, is characterized in that, calculates SOCiComprise the following steps:
2.1 judge battery pack current direction, and electric current is that canonical represents energy-storage battery charging, and ampere-hour integral result increases, electricityStream represents that for negative energy-storage battery discharges, and ampere-hour integral result reduces;
2.2 periodically carry out the ampere-hour integral operation of battery pack current, and the ampere-hour integral operation cycle is made as to 1 millisecond:
Ah(k)＝Ah(k-1)+Ik
SOCi＝SOC0+Ah(k)/(K*Cnom)
Wherein, Ah(k): the ampere-hour integrated value of current time; Ah(k-1): gained ampere-hour integration when last time ampere-hour integral operationValue; Ik: current current value, I when energy-storage battery chargingkFor just, I when electric dischargekFor negative; SOCi: based on battery pack currentThe battery pack residual capacity of data; SOC0: battery pack residual capacity SOC initial value; Cnom: battery rated capacity;K: unit conversion coefficient is the number of times that completes ampere-hour integral operation in a hour, when ampere-hour integration period is 1 millisecond,K=3600s/1ms=3600000;
It is cumulative that 2.3 periodic execution history discharge and recharge ampere-hour, and described history discharges and recharges ampere-hour and represents that energy-storage battery is from storageCan system move and start for the first time, total ampere-hour number of charge and discharge:
When energy-storage battery charging, have:
Total_In_Ah(k)＝Total_In_Ah(k-1)+Ik
Total_Ah_In＝Total_Ah_In0+Total_In_Ah(k)/K
When energy-storage battery electric discharge, have:
Total_Out_Ah(k)＝Total_Out_Ah(k-1)+Ik
Total_Ah_Out＝Total_Ah_Out0+Total_Out_Ah(k)/K
Wherein, Total_In_Ah(k): the history charging ampere-hour integrated value of current time; Total_In_Ah(k-1): went through last timeHistory charging ampere-hour integrated value when history discharges and recharges ampere-hour integration; Total_Ah_In: historical charging ampere-hour;Total_Ah_In0: historical charging ampere-hour initial value; Total_Out_Ah(k): the history electric discharge ampere-hour integrated value of current time;Total_Out_Ah(k-1): history electric discharge ampere-hour integrated value when last time, history discharged and recharged ampere-hour integration; Total_Ah_Out:Historical electric discharge ampere-hour; Total_Ah_Out0: historical electric discharge ampere-hour initial value; K: with the definition of K in step 3.2.
3. energy-storage battery Residual capacity prediction method according to claim 2, is characterized in that:
Described expected time value is 120 seconds;
Described high electric weight interval, low electric weight interval 90%-100% and the 0%-10% of corresponding SOC respectively.
4. energy-storage battery Residual capacity prediction method according to claim 1, is characterized in that:
Step (4) 4.3 in, in the situation that meeting open-circuit voltage and proofreading and correct, if high monomer voltage falls into high electricityAmount is interval, the SOCv using SOC value corresponding to high monomer voltage as battery pack; If minimum monomer voltage falls intoLow electric weight interval, the SOCv using SOC value corresponding to minimum monomer voltage as battery pack.
5. energy-storage battery Residual capacity prediction method according to claim 1, is characterized in that:
In the time that the two difference of SOCv and SOCi is greater than 2%, SOCv is set to the SOC value that battery pack is new.
6. the energy-storage battery residual capacity of the Residual capacity prediction method based on described in any one the claims is estimatedCalculate device, comprising:
Monomer voltage and temperature acquisition unit, measure battery cell voltage data, temperature data, and by voltage and temperature dataBy CAN bus transfer to battery information operational part;
Battery pack current acquisition unit, measures the current data of battery pack, and passes through SCI bus transfer to battery information computingPortion;
Battery information operational part, receives monomer voltage data, temperature data, battery pack current data, carry out SOCi withSOCv estimation, and described SOCi and SOCv one of them be set to the SOC of battery pack and cumulative historyDischarge and recharge ampere-hour, control the read-write of battery information storage part;
Battery information storage part, SOC and the history of real-time storage battery pack discharge and recharge ampere-hour.
7. energy-storage battery Residual capacity prediction device according to claim 6, is characterized in that:
Described monomer voltage and temperature acquisition unit mainly comprise LT6802-2 battery management chip, surface-mount type thermistor,Read MCU1, the CAN communication interface of monomer voltage and temperature data;
LT6802-2 by the monomer voltage of measurement with pass by spi bus by the temperature data of surface-mount type thermosensitive resistance measurementTransport to described MCU1;
MCU1 by CAN communication by monomer voltage and temperature data uploading to battery information operational part;
Wherein, surface-mount type thermistor is fixed on battery electrode column place.
8. energy-storage battery Residual capacity prediction device according to claim 6, is characterized in that:
Described battery pack current acquisition unit, comprises two-way Hall current sensor, current signal conditioning circuit, electric current letterNumber reading processor MCU2;
Two-way Hall current sensor is serially connected with total anode of battery pack, according to sense of current difference, and exportable bidirectional analogVoltage;
The analog voltage amount travel direction judgement of current signal conditioning circuit to two-way Hall current sensor output, output sideTo signal to current signal reading processor MCU2, and by the positive analog voltage amount filter of two-way Hall current sensor outputAfter ripple, access current signal reading processor MCU2, after the anti-phase and filtering of negative analog voltage, access current signal and read placeReason device MCU2;
Current signal reading processor MCU2 reads the direction signal of current signal conditioning circuit output, judges electric current sideTo, and the analog voltage amount of two-way Hall current sensor output is carried out to AD conversion, and calculate current value, tired in real timeAdd battery current value, periodically current value and current value accumulation result are passed through to SCI bus transfer to battery information computingPortion's processor MCU 3, transfers to after battery information operational part processor MCU 3 electric current in every primary current accumulation resultsElectric current accumulation results in signal-obtaining processor MCU 2 is cleared.
9. energy-storage battery Residual capacity prediction device according to claim 6, is characterized in that:
Described battery information operational part comprises battery information arithmetic processor MCU3, CAN communication interface;
Described battery information operational part processor MCU 3 receive monomer voltage that monomer voltage and temperature acquisition unit upload withThe current value that temperature data, battery pack current acquisition unit are uploaded and electric current accumulated value, by cumulative current data, estimation electricityThe SOCi of pond group; Judge time of repose, according to monomer voltage and temperature, the SOCv of estimating battery group, described in finally inciting somebody to actionSOCi and SOCv in a SOC who is set to battery pack.
10. energy-storage battery Residual capacity prediction device according to claim 9, is characterized in that: described batteryInformation operational part, in carrying out SOC estimation, carries out history and discharges and recharges the cumulative of ampere-hour, and by described historyDischarge and recharge ampere-hour and SOC and write battery information storage part.
11. energy-storage battery Residual capacity prediction devices according to claim 6, is characterized in that:
Nonvolatile memory and peripheral circuit thereof that described battery information storage part is FM3164 by model form;
Battery information operational part processor MCU 3 reads and writes behaviour by iic bus to above-mentioned nonvolatile memoryDo.
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