CN105911481A - Battery state-of-charge initial value estimation method - Google Patents
Battery state-of-charge initial value estimation method Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
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Abstract
The invention discloses a battery state-of-charge initial value estimation method, and solves the problems of high estimation error and low accuracy in the prior art. The battery state-of-charge initial value estimation method comprises six dimensions of processing: input data processing, initial moment data processing, battery state-of-charge initial value estimation, battery state-of-charge initial value failure judgment, battery state-of-charge time efficiency estimation and battery state-of-charge correction. The characteristics of power battery static chemical reaction and vehicle stationary time are fully considered on the basis of the existing battery management system so that the battery state-of-charge estimation precision can be enhanced, and the battery service life and vehicle driving mileage can be enhanced.
Description
Technical field
The present invention relates to technical field of battery management, specifically, relate to a kind of battery charge state initial value evaluation method.
Background technology
Along with the development of New Energy Industry, increasing New-energy electric vehicle is applied to all trades and professions.Pure electric automobile uses electrokinetic cell as the energy, and the estimation of battery charge state is to weigh automobile to use the most important parameter of mileage.
In prior art, the battery charge state evaluation method of Vehicular dynamic battery generally uses electric current ampere-hour integral algorithm, and too high two ends state too low at battery electric quantity is necessarily revised.Its correcting mode uses the total voltage of present battery and temperature to table look-up and obtain a fixing battery charge state substantially.It is as follows that prior art is primarily present defect: (1) ampere-hour integral algorithm itself exists estimation error；(2) using the mode that electricity two ends too low, too high are revised, the consideration battery chemistries response time causes the factor that cannot correctly characterize battery charge state, causes estimation error.
Summary of the invention
It is an object of the invention to overcome drawbacks described above, it is provided that a kind of realization is convenient, estimation result accurate battery charge state evaluation method.
To achieve these goals, the present invention is by the following technical solutions:
A kind of battery charge state initial value evaluation method, comprises the following steps:
(1) input data process: include storage value and the instantaneous value of collection of electricity under last time；
(2) battery charge state initial value lost efficacy and judged and the estimation of battery charge state time efficiency
Battery charge state initial value inefficacy determination methods is as follows:
First, it is determined that whether total voltage collection lost efficacy, not losing efficacy, battery charge state is output as the battery charge state that total voltage is corresponding；Otherwise judging whether monomer voltage collection lost efficacy, do not lost efficacy, battery charge state is output as the battery charge state that monomer voltage average is corresponding；Otherwise export the battery charge state of electricity storage under last time；
Battery charge state time efficiency evaluation method is as follows:
Maximum temperature efficiency value, minimum temperature efficiency value and temperature average efficiency value ask minimum, obtain battery charge state efficiency value；
(3) battery charge state correction
If car load is less than time threshold T1 quiescent time, then final battery charge state is equal to the battery charge state of electricity storage under last time；
If car load is more than time threshold T2 quiescent time, then final battery charge state is equal to real-time battery charge state；
If car load is quiescent time between T1 and T2, then final battery charge state is multiplied by battery charge state efficiency value equal to real-time battery charge state；
Wherein, T2 is more than T1.
Further, in described step (1), storage value includes: under last time electricity storage battery charge state, under last time electricity storage battery maximum temperature, under last time electricity storage battery minimum temperature, under last time electricity storage battery mean temperature, under last time electricity storage real-time time.
Further, the instantaneous value gathered in described step (1) includes: monomer voltage average, monomer voltage maximum, monomer voltage minima, total voltage, real-time time, temperature maximum, temperature minima, temperature average.
Further, before battery charge state time efficiency is estimated, initial time data process is carried out: car load quiescent time is that current real-time time deducts the real-time time of electricity storage under last time.
Further, described maximum temperature efficiency value is that under last time, the temperature maximum of electricity storage was looked into battery charge state temperature-time table and obtained；Described minimum temperature efficiency value is that under last time, the temperature minima of electricity storage was looked into battery charge state temperature-time table and obtained；Described temperature average efficiency value is that under last time, the temperature average of electricity storage was looked into battery charge state temperature-time table and obtained.Above-mentioned maximum temperature, minimum temperature, mean temperature temperature used of tabling look-up is all under last time the temperature value of electricity storage.
Further, before battery charge state initial value lost efficacy judgement, battery charge state initial value estimation is carried out:
Battery charge state corresponding to monomer voltage average is that monomer voltage average is looked into battery cell voltage and obtained with battery charge state table；Wherein, monomer voltage average is the instantaneous value gathered；
Battery charge state corresponding to total voltage is that total voltage/monomer voltage number is looked into battery cell voltage and obtained with battery charge state table.Wherein, total voltage is the instantaneous value gathered.
The design principle of the present invention: based on characteristics such as the static chemical reactions of electrokinetic cell, and car load is stopped using the time and combines the data such as Current Temperatures, carries out the battery charge state estimation of original state.
Compared with prior art, the method have the advantages that
The present invention, on existing battery management system basis, has taken into full account the characteristics such as the static chemical reaction of electrokinetic cell, car load quiescent time, thus has improve battery charge state estimation precision, and then improve battery and car load continual mileage.
Accompanying drawing explanation
Fig. 1 is the principle schematic of the present invention.
Fig. 2 is input data processing principle schematic diagram.
Fig. 3 is initial time flow chart of data processing figure.
Fig. 4 is that flow chart estimated by battery charge state initial value.
Fig. 5 is battery charge state initial value inefficacy decision flow chart.
Fig. 6 is that battery charge state time efficiency estimates flow chart.
Fig. 7 is battery charge state correction flow chart.
Detailed description of the invention
The invention will be further described with embodiment below in conjunction with the accompanying drawings, and embodiments of the present invention include but not limited to the following example.
Embodiment
As shown in Figure 1, present embodiments providing a kind of battery charge state initial value evaluation method, the method mainly includes the process of six dimensions: input data process, initial time data process, battery charge state initial value is estimated, battery charge state initial value lost efficacy judges, battery charge state time efficiency is estimated, battery charge state correction.By above-mentioned setting, on the basis of taking into full account the characteristics such as the static chemical reaction of electrokinetic cell, in conjunction with car load dwell time and current temperature data, it is achieved the estimation of the battery charge state of original state.
Above-mentioned initial time data process and constitute, with the estimation of battery charge state time efficiency, the scheme optimized, and the estimation of above-mentioned battery charge state initial value and battery charge state initial value lost efficacy and judge to constitute the scheme optimized；Battery charge state initial value lost efficacy and judges to be estimated as two parallel steps with battery charge state time efficiency.
According to step, variety of processes is illustrated below in conjunction with the accompanying drawings:
One, input data process
As shown in Figure 2, input data process and mainly include two aspects: be on the one hand to read the storage value of electricity under battery management system last time, named storage value at this, it mainly includes: the battery charge state of electricity storage under last time, the battery maximum temperature of electricity storage under last time, the battery minimum temperature of electricity storage under last time, the battery mean temperature of electricity storage under last time, the real-time time of electricity storage under last time.
Another aspect is battery management system collection and calculates current battery charge state value, named instantaneous value at this, it mainly includes: monomer voltage average, monomer voltage maximum, monomer voltage minima, total voltage, real-time time, temperature maximum, temperature minima, temperature average.
Two, battery charge state initial value lost efficacy and judged and the estimation of battery charge state time efficiency
As it is shown in figure 5, battery charge state initial value inefficacy determination methods is as follows:
First, it is determined that whether total voltage collection lost efficacy, not losing efficacy, battery charge state is output as the battery charge state that total voltage is corresponding；Otherwise judging whether monomer voltage collection lost efficacy, do not lost efficacy, battery charge state is output as the battery charge state that monomer voltage average is corresponding；Otherwise export the battery charge state of electricity storage under last time；Wherein, total voltage is analogue signal, and its inefficacy has two kinds of one to be to gather open lines, short circuit, open circuit inefficacy, and one is to gather data to exceed range.The determination methods of the existing specification of both failure modes, does not repeats them here.
As further prioritization scheme, battery charge state initial value lost efficacy judge before carried out battery charge state initial value estimation, as shown in Figure 4: battery charge state corresponding to (1) monomer voltage average is that monomer voltage average is looked into battery cell voltage and obtained with battery charge state table；(2) battery charge state that total voltage is corresponding is that total voltage/monomer voltage number is looked into battery cell voltage and obtained with battery charge state table.The battery charge state that above-mentioned estimation obtains is and lost efficacy in judgement at battery charge state initial value, meets the battery charge state of output under respective conditions.Wherein, described monomer voltage average, total voltage are the instantaneous value that the battery gathered by battery management system is current, and battery cell voltage is different by different battery difference table contents from battery charge state table (OCV table).
As shown in Figure 6, battery charge state time efficiency evaluation method is as follows:
Ask minimum according to maximum temperature efficiency value, minimum temperature efficiency value and temperature average efficiency value, obtain battery charge state efficiency value；Wherein, described maximum temperature efficiency value is that temperature maximum is looked into battery charge state temperature-time table and obtained；Described minimum temperature efficiency value is that temperature minima is looked into battery charge state temperature-time table and obtained；Described temperature average efficiency value is that temperature average is looked into battery charge state temperature-time table and obtained.
Because it is different that the battery chemistries response time causes battery current voltage to characterize battery charge state, therefore preferably, as shown in Figure 3, the present embodiment carried out initial time data process before battery charge state time efficiency is estimated: calculating car load quiescent time is that current real-time time deducts the real-time time of electricity storage under last time, on the basis of above-mentioned corresponding timetable i.e. initial time data after processing.Battery charge state temperature-time table obtains for different battery testings, and value is 0 to 1.
Three, battery charge state correction
As it is shown in fig. 7, battery charge state correction mainly includes three kinds of situations:
(1) if car load is less than time threshold T1 quiescent time, then final battery charge state is equal to the battery charge state of electricity storage under last time；
(2) if car load is more than time threshold T2 quiescent time, then final battery charge state is equal to real-time battery charge state, the most current pond state-of-charge；
(3) if car load is quiescent time between T1 and T2, then final battery charge state is multiplied by battery charge state efficiency value equal to real-time battery charge state.
According to above-described embodiment, the present invention just can be realized well.What deserves to be explained is; on the premise of above-mentioned design principle; for solving same technical problem; even if some made on the basis of structure disclosed in this invention or method are without substantial change or polishing; the essence of the technical scheme used is still as the present invention, therefore it should also be as within the scope of the present invention.
Claims (6)
1. a battery charge state initial value evaluation method, it is characterised in that comprise the following steps:
(1) input data process: include storage value and the instantaneous value of collection of electricity under last time；
(2) battery charge state initial value lost efficacy and judged and the estimation of battery charge state time efficiency
Battery charge state initial value inefficacy determination methods is as follows:
First, it is determined that whether total voltage collection lost efficacy, not losing efficacy, battery charge state is output as the battery charge state that total voltage is corresponding；Otherwise judging whether monomer voltage collection lost efficacy, do not lost efficacy, battery charge state is output as the battery charge state that monomer voltage average is corresponding；Otherwise export the battery charge state of electricity storage under last time；
Battery charge state time efficiency evaluation method is as follows:
Maximum temperature efficiency value, minimum temperature efficiency value and temperature average efficiency value ask minimum, obtain battery charge state efficiency value；
(3) battery charge state correction
If car load is less than time threshold T1 quiescent time, then final battery charge state is equal to the battery charge state of electricity storage under last time；
If car load is more than time threshold T2 quiescent time, then final battery charge state is equal to real-time battery charge state；
If car load is quiescent time between T1 and T2, then final battery charge state is multiplied by battery charge state efficiency value equal to real-time battery charge state；
Wherein, T2 > T1.
Battery charge state initial value evaluation method the most according to claim 1, it is characterized in that, in described step (1), storage value includes: under last time electricity storage battery charge state, under last time electricity storage battery maximum temperature, under last time electricity storage battery minimum temperature, under last time electricity storage battery mean temperature, under last time electricity storage real-time time.
Battery charge state initial value evaluation method the most according to claim 2, it is characterized in that, the instantaneous value gathered in described step (1) includes: monomer voltage average, monomer voltage maximum, monomer voltage minima, total voltage, real-time time, temperature maximum, temperature minima, temperature average.
Battery charge state initial value evaluation method the most according to claim 3, it is characterized in that, before battery charge state time efficiency is estimated, carry out initial time data process: car load quiescent time is that current real-time time deducts the real-time time of electricity storage under last time.
Battery charge state initial value evaluation method the most according to claim 4, it is characterised in that described maximum temperature efficiency value is that temperature maximum is looked into battery charge state temperature-time table and obtained；Described minimum temperature efficiency value is that temperature minima is looked into battery charge state temperature-time table and obtained；Described temperature average efficiency value is that temperature average is looked into battery charge state temperature-time table and obtained.
Battery charge state initial value evaluation method the most according to claim 3, it is characterised in that battery charge state initial value lost efficacy judge before carry out battery charge state initial value estimation:
Battery charge state corresponding to monomer voltage average is that monomer voltage average is looked into battery cell voltage and obtained with battery charge state table；
Battery charge state corresponding to total voltage is that total voltage/monomer voltage number is looked into battery cell voltage and obtained with battery charge state table.
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| CN110888074A (en) * | 2018-08-15 | 2020-03-17 | 上海汽车集团股份有限公司 | Voltage determination method and device for SOC initial value calculation |
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Effective date of registration: 20210428 Address after: 406, 4th floor, building 9, no.388, section 3, Chenglong Avenue, Chengdu Economic and Technological Development Zone (Longquanyi District), Sichuan 610000 Patentee after: Chengdu Yajun New Energy Technology Co.,Ltd. Address before: 610000 Sichuan city of Chengdu province Tianfu Tianfu Avenue South Huayang Street No. 846 Patentee before: CHENGDU RAJA NEW ENERGY AUTOMOBILE SCIENCE AND TECHNOLOGY Co.,Ltd. |