CN106932728B - Battery charge state SOC modification method, device and electric car - Google Patents

Battery charge state SOC modification method, device and electric car Download PDF

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Publication number
CN106932728B
CN106932728B CN201710208991.6A CN201710208991A CN106932728B CN 106932728 B CN106932728 B CN 106932728B CN 201710208991 A CN201710208991 A CN 201710208991A CN 106932728 B CN106932728 B CN 106932728B
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soc
voltage value
moment
battery pack
pack system
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CN106932728A (en
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杨玉梅
姚朝华
余洁
韩友国
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Chery New Energy Automobile Co Ltd
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Chery New Energy Automobile Technology Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/367—Software therefor, e.g. for battery testing using modelling or look-up tables
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/385—Arrangements for measuring battery or accumulator variables
    • G01R31/387—Determining ampere-hour charge capacity or SoC
    • G01R31/388—Determining ampere-hour charge capacity or SoC involving voltage measurements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Secondary Cells (AREA)

Abstract

The invention discloses a kind of battery charge state SOC modification method, device and electric cars, belong to electronic technology field.This method comprises: obtaining battery pack system in the initial state-of-charge SOC at the i-th moment and the first temperature value, i > 0；The practical SOC of the battery pack system is determined according to first temperature value；The theoretical SOC at i-th moment is calculated by current integration method according to the initial SOC and first temperature value；The theory SOC is corrected according to the difference between the theory SOC and the practical SOC, obtains i-th moment corresponding revised SOC.The present invention solves BMS when calculating SOC according to current integration method, directly using calculated theory SOC as the true SOC of battery pack system, caused calculated SOC not accurate enough problem；Improve the accuracy for the SOC that BMS is obtained.

Description

Battery charge state SOC modification method, device and electric car
Technical field
The present embodiments relate to electronic technology field, in particular to a kind of battery charge state SOC modification method, device And electric car.
Background technique
With the development of electric vehicle engineering, electric car using more and more extensive.Electric car is according to battery system The state-of-charge (state of charge, SOC) of system is estimated that vehicle driving mileage, to provide in driving for driver The important information of journey.Wherein, battery pack system is the major impetus source of electric car；SOC refers to the electricity in battery pack system Using a period of time or shelving the ratio of total battery capacity when remaining battery capacity after a period of time is completely filled with electricity with it in pond.
Electric car usually passes through battery management system (battery management system, BMS) according to ampere-hour product Point-score (or Ah counting method) determines the SOC of battery pack system.Current integration method refers to: BMS works in battery pack system During, by the way that the charging and discharging currents of battery pack system are carried out integral calculation to the time, to estimate battery pack system Current SOC.The calculation formula of current integration method is as follows:
Wherein, SOC is the current SOC, SOC of battery pack system0For the initial SOC of battery pack system, i (t) be electric current with Time t variation function, x be battery pack system during the work time at the time of, C be battery pack system total electricity.
When determining SOC by current integration method due to BMS, the electric current at each moment during accurately collecting work is needed Value, when the current value of BMS acquisition is inaccurate, the working time of battery pack system is longer, the cumulative errors of calculated SOC It is bigger.
Summary of the invention
SOC, the larger problem of the cumulative errors of obtained SOC, the present invention are calculated in order to solve BMS by current integration method Embodiment provides a kind of battery SOC modification method and device.The technical solution is as follows:
In a first aspect, providing a kind of battery SOC modification method, which comprises
Battery pack system is obtained in the initial state-of-charge SOC at the i-th moment and the first temperature value, i > 0；
The practical SOC of the battery pack system is determined according to first temperature value；
The theory at i-th moment is calculated by current integration method according to the initial SOC and first temperature value SOC；
The theory SOC is corrected according to the difference between the theory SOC and the practical SOC, obtains i-th moment Corresponding revised SOC.
Optionally, the practical SOC that the battery pack system is determined according to first temperature value, comprising:
According to the first corresponding relationship prestored, determine that total battery of the battery pack system under first temperature value holds Amount, first corresponding relationship include at least the corresponding relationship between first temperature value and total battery capacity；
Obtain the remaining battery capacity of the battery pack system；
The ratio between the remaining battery capacity and total battery capacity is calculated, the practical SOC is obtained.
Optionally, i-th moment is at the time of belonging to startup stage, and the acquisition battery pack system is at the i-th moment Initial state-of-charge SOC, comprising:
Detect whether standing duration of the battery pack system before the startup stage reaches preset duration；
When the standing duration reaches the preset duration, the battery pack system is obtained the of i-th moment One total voltage value, the first SOC and second temperature value, first total voltage value be it is collected by first sensor, it is described First sensor is used to acquire the whole voltage value of the battery pack system；First SOC is integrated by the ampere-hour What method was calculated；The second temperature value and the temperature characteristic manner of first temperature value are identical or different；
It is worth corresponding second corresponding relationship according to the second temperature, determines first total voltage value corresponding second SOC, second corresponding relationship include at least the corresponding relationship between first total voltage value and the 2nd SOC；
According to the minimum cell voltage value of the battery pack system and maximum cell voltage value, the battery pack system is calculated The second total voltage value, the minimum cell voltage value and the maximum cell voltage value are collected by second sensor , the second sensor is used to acquire the voltage value of each single battery in the battery pack system；
Respectively to the first SOC and the 2nd SOC, and, first total voltage value and second total voltage Value is compared；
It is less than second total voltage value in first total voltage value, and the first SOC is greater than the 2nd SOC When；Alternatively, being less than second total voltage value in first total voltage value, and the first SOC is greater than the 2nd SOC When, determine that the initial SOC at i-th moment is the first SOC；
It is less than or equal to second total voltage value in first total voltage value, and the first SOC is less than or equal to described When two SOC；Alternatively, first total voltage value be more than or equal to second total voltage value, and the first SOC be greater than etc. When two SOC, determine that the initial SOC at i-th moment is the 2nd SOC.
Optionally, i-th moment is at the time of belonging to the operation phase, and the acquisition battery pack system is at the i-th moment Initial state-of-charge SOC, comprising:
The battery pack system is obtained in the third total voltage value at i-th moment；
Corresponding 3rd SOC of the third total voltage value is determined according to third corresponding relationship, and the third corresponding relationship is extremely It less include the corresponding relationship between the third total voltage value and the 3rd SOC；
The initial SOC at i-th moment is calculated by the current integration method according to the 3rd SOC.
Optionally, i-th moment is at the time of belonging to the operation phase, and the acquisition battery pack system is at the i-th moment Initial state-of-charge SOC, comprising:
Startup stage SOC is obtained, the startup stage SOC is the cut-off time corresponding SOC of startup stage；
The initial SOC at i-th moment is calculated by the current integration method according to the startup stage SOC.
Optionally, the difference according between the theory SOC and the practical SOC corrects the theory SOC, obtains I-th moment corresponding revised SOC, comprising:
According to the corresponding sampled point of each moment before i-th moment, by least square method construct mathematical model, The sampled point refers to the difference between the corresponding theory SOC and practical SOC of each moment；
I-th moment corresponding modifying factor is calculated according to the mathematical model；
It is modified using the modifying factor theory SOC corresponding to i-th moment, after obtaining the amendment SOC.
Optionally, described to be modified using the modifying factor theory SOC corresponding to i-th moment, it obtains To after the revised SOC, further includes:
Whether within a preset range to detect difference between the revised SOC and the practical SOC；
When the difference between the revised SOC and the practical SOC is not in the preset range, repaired described SOC after just is determined as i+1 moment corresponding theory SOC, continue to execute it is described according to each before i-th moment when Corresponding sampled point is carved, the step of by least square method construct mathematical model.
Second aspect, provides a kind of battery SOC correcting device, and described device includes:
Module is obtained, for obtaining battery pack system in the initial state-of-charge SOC at the i-th moment and the first temperature value, i > 0；
First determining module, first temperature value for being got according to the acquisition module determine the battery pack The practical SOC of system；
Computing module, the initial SOC and first temperature value for being got according to the acquisition module pass through Current integration method calculates the theoretical SOC at i-th moment；
Correction module, the theory SOC for being obtained according to the computing module are obtained with first determining module The practical SOC between difference correct the theory SOC, obtain i-th moment corresponding revised SOC.
Optionally, first determining module, comprising:
First determination unit, for determining the battery pack system described first according to the first corresponding relationship prestored Total battery capacity under temperature value, first corresponding relationship include at least first temperature value and total battery capacity it Between corresponding relationship；
First acquisition unit, for obtaining the remaining battery capacity of the battery pack system；
First computing unit is obtained for calculating the ratio between the remaining battery capacity and total battery capacity The practical SOC.
Optionally, i-th moment is acquisition module at the time of belonging to startup stage, comprising:
Detection unit, for detecting whether standing duration of the battery pack system before the startup stage reaches default Duration；
Second acquisition unit, for obtaining the battery pack system when the standing duration reaches the preset duration In first total voltage value at i-th moment, the first SOC and second temperature value, first total voltage value is passed by first Sensor is collected, and the first sensor is used to acquire the whole voltage value of the battery pack system；First SOC is It is calculated by the current integration method；The second temperature value is identical as the temperature characteristic manner of first temperature value Or it is different；
Second determination unit determines that described first is total for being worth corresponding second corresponding relationship according to the second temperature Corresponding 2nd SOC of voltage value, second corresponding relationship include at least between first total voltage value and the 2nd SOC Corresponding relationship；
Second computing unit, for according to the minimum cell voltage value of the battery pack system and maximum cell voltage value, The second total voltage value of the battery pack system is calculated, the minimum cell voltage value and the maximum cell voltage value are to pass through Second sensor is collected, and the second sensor is used to acquire the voltage of each single battery in the battery pack system Value；
Comparing unit is used for respectively to the first SOC and the 2nd SOC, and, first total voltage value and institute The second total voltage value is stated to be compared；
Third determination unit, for being less than second total voltage value, and the first SOC in first total voltage value When greater than two SOC；Alternatively, being less than second total voltage value in first total voltage value, and the first SOC is big When two SOC, determine that the initial SOC at i-th moment is the first SOC；
4th determination unit, for being less than or equal to second total voltage value, and described the in first total voltage value When one SOC is less than or equal to two SOC；Alternatively, it is more than or equal to second total voltage value in first total voltage value, and When first SOC is more than or equal to two SOC, determine that the initial SOC at i-th moment is the 2nd SOC.
Optionally, i-th moment is acquisition module at the time of belonging to the operation phase, comprising:
Third acquiring unit, for obtaining the battery pack system in the third total voltage value at i-th moment；
5th determination unit, for determining corresponding 3rd SOC of the third total voltage value, institute according to third corresponding relationship Third corresponding relationship is stated including at least the corresponding relationship between the third total voltage value and the 3rd SOC；
Third computing unit, for calculating the institute at i-th moment by the current integration method according to the 3rd SOC State initial SOC.
Optionally, i-th moment is acquisition module at the time of belonging to the operation phase, comprising:
4th acquiring unit, for obtaining startup stage SOC, the startup stage SOC is the cut-off time of startup stage Corresponding SOC；
4th computing unit, for calculating i-th moment by the current integration method according to the startup stage SOC The initial SOC.
Optionally, the correction module, comprising:
Construction of A Model unit, for passing through minimum two according to the corresponding sampled point of each moment before i-th moment Multiplication construct mathematical model, the sampled point refer to the difference between the corresponding theory SOC and practical SOC of each moment Value；
5th computing unit, for calculating i-th moment corresponding modifying factor according to the mathematical model；
Amending unit, for being modified using the modifying factor theory SOC corresponding to i-th moment, Obtain the revised SOC.
Optionally, described to be modified using the modifying factor theory SOC corresponding to i-th moment, it obtains To after the revised SOC, described device further include:
Detection module, for whether detecting the difference between the revised SOC and the practical SOC in preset range It is interior；
Second determining module, for when the difference between the revised SOC and the practical SOC is not described default When in range, the revised SOC is determined as i+1 moment corresponding theory SOC, continues to execute the Construction of A Model list The corresponding sampled point of each moment according to before i-th moment in member, passes through least square method structure mathematics mould The step of type.
The third aspect provides a kind of electric car, which includes the dress of at least one described in second aspect It sets.
Technical solution bring beneficial effect provided in an embodiment of the present invention includes:
By the theoretical SOC for calculating for the i-th moment；The practical SOC for calculating battery pack system is determined according to the first temperature value；Root The factually difference revised theory SOC between border SOC and theory SOC；BMS is solved when calculating SOC according to current integration method, directly It connects using calculated theory SOC as the true SOC of battery pack system, caused calculated SOC not accurate enough problem；By The practical SOC of battery pack system can be determined according to first temperature value at the i-th moment of battery pack system in BMS, as practical SOC When difference between theoretical SOC is larger, illustrate the calculated theory SOC of BMS there are biggish bigger than normal, by according to the difference Revised theory SOC obtains revised SOC, improves the accuracy for the SOC that BMS is obtained.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other Attached drawing.
Fig. 1 is the flow chart of battery SOC modification method provided by one embodiment of the present invention；
Fig. 2A is the flow chart for the battery SOC modification method that another embodiment of the present invention provides；
Fig. 2 B is the schematic diagram of the second corresponding relationship provided by one embodiment of the present invention；
Fig. 2 C is the schematic diagram of the second corresponding relationship provided by one embodiment of the present invention；
Fig. 2 D is the schematic diagram of the second corresponding relationship provided by one embodiment of the present invention；
Fig. 2 E is the schematic diagram of the first corresponding relationship provided by one embodiment of the present invention；
Fig. 3 is the flow chart for the battery SOC modification method that another embodiment of the present invention provides；
Fig. 4 is the flow chart for the battery SOC modification method that another embodiment of the present invention provides；
Fig. 5 is the block diagram of battery SOC correcting device provided by one embodiment of the present invention；
Fig. 6 is the block diagram for the battery SOC correcting device that another embodiment of the present invention provides.
Specific embodiment
Example embodiments are described in detail here, and the example is illustrated in the accompanying drawings.Following description is related to When attached drawing, unless otherwise indicated, the same numbers in different drawings indicate the same or similar elements.Following exemplary embodiment Described in embodiment do not represent all embodiments consistented with the present invention.On the contrary, they be only with it is such as appended The example of device and method being described in detail in claims, some aspects of the invention are consistent.
Firstly, to present document relates to several nouns be introduced.
1, the startup stage of battery pack system: refer to battery pack system open-circuit voltage (open circuit voltage, OCV) rise, and the change rate biggish stage.
2, the operation phase of battery pack system: referring to that the OCV of battery pack system is persistently greater than the stage of preset voltage value, fortune Row order section is after the start up period.
3, the standing stage of battery pack system: referring to stage of the OCV continuously less than preset voltage value of battery pack system, quiet Only the stage is before startup stage.
4, cell voltage value: the voltage value of each single battery in the battery pack system of electric car.
5, battery consistency is poor: referring to the difference between the remaining battery capacity between the single battery in battery pack system Value, and/or, the difference between voltage between single battery.In general, the BMS in electric car needs to guarantee battery consistency Difference within a preset range, to improve the cruising ability of battery.
Method provided in an embodiment of the present invention, the executing subject of each step are the BMS in electric car, and BMS is for monitoring The state of battery pack system, such as: monitor static condition, starting state and operating status of battery pack system etc., static condition Refer to that battery pack system is standing stage state in which；Starting state refers to battery pack system in startup stage (alternatively, powering on Stage) state in which；Operating status refers to battery pack system state in which in the operation phase.Wherein, electric car packet Pure electric automobile, hybrid-electric car etc. are included but are not limited to, the present embodiment is not construed as limiting this.
Referring to FIG. 1, it illustrates the flow charts of battery SOC modification method provided by one embodiment of the present invention.The party Method may include following steps:
Step 101, initial SOC and first temperature value of the battery pack system at the i-th moment, i > 0 are obtained.
Step 102, the practical SOC of battery pack system is determined according to the first temperature value.
Step 103, the theoretical SOC at the i-th moment is calculated by current integration method according to initial SOC and the first temperature value.
Optionally, step 103 can execute before step 102, can also execute after step 102, can also be with Step 102 is performed simultaneously, and the present embodiment is not construed as limiting this.
Step 104, according to the difference revised theory SOC between theoretical SOC and practical SOC, obtaining for the i-th moment corresponding is repaired SOC after just.
In conclusion battery SOC modification method provided in this embodiment, by the theoretical SOC for calculating for the i-th moment；According to First temperature value determines the practical SOC for calculating battery pack system；According to the difference revised theory between practical SOC and theory SOC SOC；BMS is solved when calculating SOC according to current integration method, directly using calculated theory SOC as battery pack system True SOC, caused calculated SOC not accurate enough problem；Since BMS can be according to the of the i-th moment of battery pack system One temperature value determines the practical SOC of battery pack system, when the difference between practical SOC and theory SOC is larger, illustrates BMS Calculated theory SOC by obtaining revised SOC according to difference revised theory SOC, is improved there are biggish bigger than normal The accuracy for the SOC that BMS is obtained.
The present invention provides three kinds to the corrected method of the SOC of battery pack system, this method is respectively used to battery pack The startup stage (please referring to embodiment shown in Fig. 2A) of system, the operation phase of battery pack system (please refer to reality shown in Fig. 3 Apply example), the startup stage of battery pack system and operation phase (please referring to embodiment shown in Fig. 4), below to these three methods It is described respectively.
Fig. 2A is please referred to, it illustrates the flow charts for the battery SOC modification method that another embodiment of the present invention provides.It should Method is used for the startup stage of battery pack system, this method including the following steps:
Step 201, whether standing duration of the detection battery pack system before startup stage reaches preset duration.
Wherein, at the time of the i-th moment was the startup stage for belonging to battery pack system.Such as: the initial time of startup stage (or booting moment of battery pack system).
Static duration refer to battery pack system since the last shutdown moment to this Startup time through passing through Duration.That is, battery pack system is in the duration in standing stage.In the present embodiment, battery pack system is also kept in the standing stage Clock in BMS is powered, so that BMS can read the standing duration of battery pack system in the standing stage.
Since the OCV of battery pack system is after the standing duration of battery pack system reaches certain numerical value, Cai Huiyu SOC exists Relatively-stationary functional relation, therefore, in order to get more accurately SOC, BMS can detect the i-th moment battery pack system Stand whether duration reaches preset duration.If the duration of standing of the i-th moment battery pack system is more than or equal to preset duration, explanation The OCV of battery pack system is more stable at this time, and BMS can determine more accurately SOC according to the OCV, at this point, executing step 202；If the duration of standing of the i-th moment battery pack system is less than preset duration, illustrate that the OCV of battery pack system at this time is unstable Fixed, BMS cannot get more accurately SOC according to the OCV, at this point, at the time of BMS acquisition last time electric car is out of service Corresponding SOC.Wherein, preset duration is in OCV and SOV there are when relatively-stationary functional relation, according to the place of electric car It is determined in the duration in the stage of standing.
Optionally, BMS only initial time in startup stage can execute this step；Alternatively, can also be in startup stage In any one moment in addition to initial time execute this step；Alternatively, can also startup stage each moment it is equal This step is executed, the present embodiment is not construed as limiting this.
Step 202, battery pack system is obtained in first total voltage value at the i-th moment, the first SOC and second temperature value.
The first total voltage value (i.e. the OCV of the i-th moment battery pack system) of battery pack system is to be passed by BMS by first What sensor collected, which is used to acquire the whole voltage value of battery pack system.
In the first implementation, second temperature value is temperature of the battery pack system that arrives of BMS system acquisition at the i-th moment Angle value.
In the second implementation, second temperature value be since the initial time of the startup stage of battery pack system to Until i-th moment, BMS system is according to the calculated average temperature value of collected temperature value of each moment.
First SOC is to be calculated by BMS by current integration method.Usual BMS can be true by the first SOC being calculated It is set to the true SOC of battery pack system.
Ampere-hour integral formula is as follows, wherein SOC is the first SOC；SOC0It is battery pack system in the starting of startup stage The SOC at quarter, the SOC of the initial time can be what BMS was determined according to the corresponding relationship between OCV and SOC；Alternatively, can also be with It is SOC at the time of last time electric car that BMS is got is out of service, the present embodiment is not construed as limiting this；The upper limit of integral Value i refers to the duration passed through since the initial time of the startup stage of battery pack system to the i-th moment；The lower limit value 0 of integral Refer to the initial time of the startup stage of battery pack system；I (t) refers to the function that the electric current of battery pack system changes over time, The function is that BMS is got by monitoring the curent change of battery pack system in real time；C refers to total when battery pack system is fully charged Battery capacity, which, which can be, is preset in BMS, and be directly obtained by the BMS；Alternatively, being also possible to BMS It is obtained according to the first corresponding relationship determination between second temperature value and total battery capacity, the present embodiment is not construed as limiting this. Wherein, the first corresponding relationship is used to indicate the corresponding relationship between temperature value and total battery capacity.
Step 203, corresponding second corresponding relationship is worth according to second temperature, determines the first total voltage value corresponding second SOC。
Second corresponding relationship is used to indicate the corresponding relationship between the OCV of battery pack system and SOC, and the second corresponding relationship Including at least the corresponding relationship between the first total voltage value and the 2nd SOC.
Optionally, at different temperature due to battery pack system, the corresponding relationship between OCV and SOC is also different, Therefore, it is preset with to accurately obtain battery pack system in the first total voltage value corresponding 2nd SOC, BMS at the i-th moment Different temperatures is worth corresponding second corresponding relationship, and BMS is worth corresponding second corresponding relationship according to second temperature, determines first total electricity Pressure is worth corresponding 2nd SOC.
Assuming that being preset with corresponding second corresponding relationship (as shown in Figure 2 B), temperature when temperature value is 5 DEG C (degree Celsius) in BMS Angle value corresponding second corresponding relationship when corresponding second corresponding relationship (as shown in Figure 2 C), temperature value are 35 DEG C when being 25 DEG C (as shown in Figure 2 D), if BMS is got, the first total voltage value is 350V (volt), second temperature value is 5 DEG C, according to fig. 2 shown in B The second corresponding relationship, BMS determine the 2nd SOC be 37%.
Optionally, since corresponding second corresponding relationship of different temperatures preset in BMS value can not be infinitely more, and BMS The temperature value of the battery pack system got but may be to be a variety of, in order to guarantee that BMS can be determined pair according to second temperature value The second corresponding relationship answered, BMS can determine the second corresponding relationship being closer to according to the second temperature value got.
BMS determines the second corresponding relationship being closer to according to the second temperature value got, comprising: when no pre- in BMS When depositing corresponding second corresponding relationship of the second temperature value got, determine in each temperature value that BMS is prestored with second temperature Corresponding second corresponding relationship of the target temperature value is determined as be closer to second pair by the smallest target temperature value of angle value difference It should be related to.
Optionally, in order to get accurate 2nd SOC, thus avoid leading to the problem of battery consistency difference, In this step, at least two features can be respectively set in the more gentle stage in each second corresponding relationship prestored in BMS Point；Whether the difference being respectively compared between the 2nd SOC got SOC corresponding at least two characteristic point is less than or equal to Preset threshold；When the difference between the 2nd SOC SOC corresponding at least two characteristic point is respectively less than preset threshold, BMS is true Surely the 2nd SOC got is accurate；As the 2nd SOC SOC corresponding with any one characteristic point at least two characteristic point Between difference be greater than preset threshold when, the corresponding SOC of this feature point is determined as the 2nd SOC by BMS.The present embodiment is not to default The specific value of threshold value limits.
Assuming that BMS the second corresponding relationship shown in B according to fig. 2, the first total voltage value 350V corresponding second determined SOC is 37%, which is in the smoother stage in the second corresponding relationship shown in Fig. 2 B, and fisrt feature point is p1, the Two characteristic points are p2, and preset threshold 20%, then the difference between the 2nd SOC SOC corresponding with p1 is 20%；2nd SOC with Difference between the corresponding SOC of p2 is 6%, and therefore, BMS can determine that the 2nd SOC got is accurate.
Step 204, according to the minimum cell voltage value of battery pack system and maximum cell voltage value, battery pack system is calculated The second total voltage value.
Wherein, minimum cell voltage value and maximum cell voltage value are collected by second sensor, second biography Sensor is used to acquire the voltage value of each single battery in battery pack system.In general, the collected monomer electricity of second sensor Pressure value is closer to the real voltage value of battery pack system.
BMS calculates the second total voltage value of battery pack system by following formula, wherein k is to connect in battery pack system Battery quantity, ULV-CellFor the minimum cell voltage value of battery pack system；UHV-CellFor the maximum monomer electricity of battery pack system Pressure value.
U=k (ULV-Cell+UHV-Cell)/2
Optionally, step 204 can execute before step 202 and 203, can also hold after step 202 and 203 Row, can also be performed simultaneously, the present embodiment is not construed as limiting this with step 202 and 203.
Step 205, respectively to the first SOC and the 2nd SOC, and, the first total voltage value and the second total voltage value are compared Compared with.
Since first sensor and second sensor are usually different, this may cause first sensor and second to pass Sensor sampling precision and/or sampling period are different, and the collected cell voltage value of second sensor is closer to battery pack The true voltage value of system, therefore, when BMS is according to minimum cell voltage value and maximum cell voltage value, calculated second When total voltage value is greater than the first total voltage value, illustrate that the true voltage value of battery pack system is bigger than normal, according to the second corresponding relationship It is found that the true SOC (that is, the first SOC) of battery pack system should be bigger than normal, at this point, if the first SOC is greater than the 2nd SOC, explanation Calculated first SOC of BMS is more accurate, executes step 206 at this time；If the first SOC is less than or equal to the 2nd SOC, illustrate BMS Calculated first SOC inaccuracy, should correct the first SOC, at this point, executing step 207.
When BMS is according to minimum cell voltage value and maximum cell voltage value, calculated second total voltage value is less than first When total voltage value, illustrate that the true voltage value of battery pack system is less than normal, according to the second corresponding relationship it is found that battery pack system True SOC (that is, the first SOC) should be less than normal, at this point, if the first SOC illustrates BMS calculated first less than the 2nd SOC SOC is more accurate, executes step 206 at this time；If the first SOC is greater than or equal to the 2nd SOC, illustrate calculated first SOC of BMS Inaccuracy should correct the first SOC, at this point, executing step 207.
In the present embodiment, by comparing between the first total voltage value and the second total voltage value size and the first SOC with Size between 2nd SOC can determine whether to need calculated first SOC of modified BM S.
Step 206, in the first total voltage value less than the second total voltage value, and when the first SOC is greater than two SOC；Alternatively, First total voltage value determines that initial SOC is the first SOC, executes less than the second total voltage value, and when the first SOC is greater than two SOC Step 208.
Step 207, it is less than or equal to the second total voltage value in the first total voltage value, and the first SOC is less than or equal to the 2nd SOC When；Alternatively, the first total voltage value be more than or equal to the second total voltage value, and the first SOC be more than or equal to two SOC when, determine just Beginning SOC is the 2nd SOC.
Step 208, the first temperature value of the i-th moment battery pack system is obtained.
In the first implementation, the first temperature value is the temperature for the i-th moment battery pack system that BMS system acquisition arrives Value.
In the second implementation, the first temperature value be since the initial time of the startup stage of battery pack system to Until i-th moment, BMS system is according to the calculated average temperature value of collected temperature value of each moment.
Optionally, the first temperature value can be identical with the characteristic manner of second temperature value, such as: the first temperature value and second Temperature value is all made of the first implementation to characterize；Alternatively, the characteristic manner of the first temperature value and second temperature value can also be with Difference, such as: the first temperature value is characterized by first way, and second temperature value is characterized by the second way, the present embodiment This is not construed as limiting.
Optionally, this step can execute before step 201-207, can also execute after step 201-207, also It can be performed simultaneously with step 201-207, the present embodiment is not construed as limiting this.
Step 209, total battery of the corresponding battery pack system of the first temperature value is determined according to the first corresponding relationship prestored Capacity.
Since in the temperature difference of battery pack system, the corresponding total battery capacity of the battery pack system is also different, Therefore, by prestoring the first corresponding relationship in BMS, battery pack system under Current Temperatures is determined according to first corresponding relationship Total battery capacity, improve BMS according to total battery capacity by current integration method calculate SOC when accuracy.
Wherein, the first corresponding relationship includes at least the corresponding relationship between the first temperature value and total battery capacity.Assuming that BMS In the first corresponding relationship for prestoring it is as shown in Figure 2 E.
Step 210, the remaining battery capacity of battery pack system is obtained.
BMS obtains the battery capacity of battery pack system consumption by monitoring the state of battery pack system in real time, will total electricity The remaining battery capacity for the battery pack system that the battery capacity that tankage subtracts the consumption obtains.
Step 211, the ratio between remaining battery capacity and total battery capacity is calculated, practical SOC is obtained.
BMS calculates practical SOC by following formula, wherein Δ C is the battery capacity of battery pack system consumption, CT0For Total battery capacity that BMS is determined according to the first temperature value.
Practical SOC=(CT0-ΔC)/CT0
Step 212, the theoretical SOC at the i-th moment is calculated by current integration method according to initial SOC and the first temperature value.
BMS calculates theory SOC by current integration method.Ampere-hour integral formula is as follows, wherein SOC is theory SOC, SOC0 The initial SOC obtained for step 206 or step 207；Upper limit of integral value i refers in the starting of the startup stage of battery pack system Carve the duration for starting to pass through to the i-th moment；Lower limit of integral value i-1 refers to that the initial time of the startup stage in battery pack system is opened Begin the duration passed through to the (i-1)-th moment；I (t) refers to the function that the electric current of battery pack system changes over time；C is BMS according to Total battery capacity that one corresponding relationship and the first temperature value are determined.
Step 213, according to the difference revised theory SOC between theoretical SOC and practical SOC, obtaining for the i-th moment corresponding is repaired SOC after just.
BMS is according to the difference revised theory SOC between theoretical SOC and practical SOC, after obtaining the corresponding amendment of the i-th moment SOC, comprising: according to the corresponding sampled point of each moment before the i-th moment, pass through least square method construct mathematical model； The i-th moment corresponding modifying factor is calculated according to mathematical model；It is carried out using modifying factor theory SOC corresponding to the i-th moment Amendment, obtains revised SOC.Wherein, sampled point refers to the difference between corresponding theory SOC and practical SOC of each moment.
Optionally, user's expected effect may be not achieved in amendment of i-th moment to theoretical SOC due to BMS, It is modified using modifying factor theory SOC corresponding to the i-th moment, after obtaining revised SOC, further includes: detection Within a preset range whether the difference between revised SOC and practical SOC；Difference between revised SOC and practical SOC When being worth not within a preset range, revised SOC is determined as i+1 moment corresponding theory SOC, is continued to execute according to predetermined Corresponding sampled point of each moment before moment, the step of by least square method construct mathematical model.The present embodiment is not right The setting means of preset range limits, such as: preset range is [- 5% ,+5%].
In conclusion battery SOC modification method provided in this embodiment, by start-up phase, according to battery pack system The first total voltage value, the second total voltage value, the first SOC and the 2nd SOC obtain the initial SOC of battery pack system so that BMS It is available to arrive accurate initial SOC, it improves BMS and theoretical SOC is being calculated by current integration method according to initial SOC When accuracy.
Referring to FIG. 3, the flow chart of the battery SOC modification method provided it illustrates another embodiment of the present invention.It should Method is used for the operation phase of battery pack system, based on embodiment shown in Fig. 2A, the replaceable step as step 201-207 Suddenly, this method including the following steps:
Step 301, the third total voltage value of battery pack system is obtained.
The third total voltage value (OCV of the i-th moment battery pack system i.e. in the operation phase) of battery pack system, be by BMS is collected by first sensor.
Step 302, corresponding 3rd SOC of third total voltage value is determined according to third corresponding relationship.
SOC0It is SOC of the battery pack system in the initial time of operation phase, the SOC of the initial time can be BMS root It is determined according to the third corresponding relationship between OCV and SOC.Wherein, third corresponding relationship can be identical as the second corresponding relationship, Can be identical as the second corresponding relationship, the present embodiment is not construed as limiting this.
Step 303, initial SOC is calculated by current integration method according to the 3rd SOC.
Ampere-hour integral formula used in current integration method is as follows, wherein SOC is initial SOC；SOC0It is the 3rd SOC；Product The upper limit value i divided, which refers to, starts the duration passed through to the i-th moment in the initial time of the operation phase of battery pack system；Integral Lower limit value i refers to the initial time of the operation phase of battery pack system；I (t) refers to that the electric current of battery pack system changes over time Function, which is BMS is got by monitoring the curent change of battery pack system in real time；C refers to that battery pack system fills Total battery capacity when full electricity, which, which can be, is preset in BMS, and be directly obtained by the BMS；Alternatively, Can be BMS, corresponding relationship between total battery capacity is determined and to be obtained according to the current temperature value, the present embodiment to this not It limits.
In conclusion battery SOC modification method provided in this embodiment, by calculating the reason at the i-th moment in the operation phase By SOC；The practical SOC for calculating battery pack system is determined according to the first temperature value；According to the difference between practical SOC and theory SOC It is worth revised theory SOC；BMS is solved when calculating SOC according to current integration method, directly using calculated theory SOC as electricity The true SOC of pond group system, caused calculated SOC not accurate enough problem；Since BMS can be according to battery pack system First temperature value at i moment determines the practical SOC of battery pack system, when the difference between practical SOC and theory SOC is larger When, illustrate the calculated theory SOC of BMS there are biggish bigger than normal, by according to difference revised theory SOC, after obtaining amendment SOC, improve the accuracy for the SOC that BMS is obtained.
In order to further increase the accuracy for the SOC that BMS is got, BMS can be obtained with embodiment shown in A according to fig. 2 Revised SOC, above-mentioned initial SOC is calculated by current integration method.
Referring to FIG. 4, the flow chart of the battery SOC modification method provided it illustrates another embodiment of the present invention.It should Method is used for the operation phase of battery pack system, based on embodiment shown in Fig. 2A, the replaceable step as step 201-207 Suddenly, this method including the following steps:
Step 401, startup stage SOC is obtained, startup stage SOC is the cut-off time corresponding SOC of startup stage.
In one case, BMS is modified theoretical SOC in the startup stage of battery pack system.At this point, BMS is being transported The startup stage SOC that row order section is got is to pass through modified SOC in startup stage.That is, SOC or warp that step 213 obtains The SOC that other modification methods obtain is crossed, the present embodiment is not construed as limiting this.
In another case, BMS is not modified theoretical SOC in the startup stage of battery pack system, but directly Export the theoretical SOC being calculated by current integration method.At this point, the startup stage SOC that BMS is got in the operation phase is reason By SOC.
Step 402, the initial SOC at the i-th moment is calculated by current integration method according to startup stage SOC.
Ampere-hour integral formula used in current integration method is as follows, wherein SOC is initial SOC；SOC0It is startup stage SOC；The upper limit value i of integral, which refers to, starts the duration passed through to the i-th moment in the initial time of the operation phase of battery pack system； The lower limit value i of integral refers to the initial time of the operation phase of battery pack system；I (t) refers to the electric current of battery pack system at any time Between the function that changes, which is that BMS is got by monitoring the curent change of battery pack system in real time；C refers to battery pack Total battery capacity when system is fully charged, which, which can be, is preset in BMS, and be directly obtained by the BMS；Or Person is also possible to what corresponding relationship determination of the BMS according to the current temperature value between total battery capacity obtained, the present embodiment pair This is not construed as limiting.
In conclusion battery SOC modification method provided in this embodiment, by the operation phase, according in startup stage Initial SOC is calculated by modified startup stage SOC；Theory SOC is calculated further according to the initial SOC；Since the initial SOC is root According to what is obtained in startup stage revised SOC, so that the accuracy of calculated theory SOC is higher, in this way, reducing BMS The times of revision being modified needed for the operation phase to theoretical SOC, saves process resource.
Following is apparatus of the present invention embodiment, can be used for executing embodiment of the present invention method.For apparatus of the present invention reality Undisclosed details in example is applied, embodiment of the present invention method is please referred to.
Referring to FIG. 5, it illustrates the block diagrams of battery SOC correcting device provided by one embodiment of the present invention.The device With the exemplary function of the above method is executed, function can also be executed corresponding software realization by hardware realization by hardware. The apparatus may include: obtain module 510, the first determining module 520, computing module 530 and correction module 540.
Module 510 is obtained, for obtaining battery pack system in the initial state-of-charge SOC at the i-th moment and the first temperature value, I > 0；
First determining module 520, the first temperature value for being got according to acquisition module 510 determine battery pack system Practical SOC；
Computing module 530, initial SOC and the first temperature value for being got according to acquisition module 510 pass through ampere-hour product The theoretical SOC at the i-th moment of calculation of group dividing；
Correction module 540, the reality that theoretical SOC and the first determining module 520 for being obtained according to computing module 530 are obtained Difference revised theory SOC between the SOC of border obtains the i-th moment corresponding revised SOC.
In conclusion battery SOC correcting device provided in this embodiment, by the theoretical SOC for calculating for the i-th moment；According to First temperature value determines the practical SOC for calculating battery pack system；According to the difference revised theory between practical SOC and theory SOC SOC；BMS is solved when calculating SOC according to current integration method, directly using calculated theory SOC as battery pack system True SOC, caused calculated SOC not accurate enough problem；Since BMS can be according to the of the i-th moment of battery pack system One temperature value determines the practical SOC of battery pack system, when the difference between practical SOC and theory SOC is larger, illustrates BMS Calculated theory SOC by obtaining revised SOC according to difference revised theory SOC, is improved there are biggish bigger than normal The accuracy for the SOC that BMS is obtained.
Referring to FIG. 6, it illustrates the block diagrams of battery SOC correcting device provided by one embodiment of the present invention.The device With the exemplary function of the above method is executed, function can also be executed corresponding software realization by hardware realization by hardware. The apparatus may include: obtain module 510, the first determining module 520, computing module 530 and correction module 540.
Module 510 is obtained, for obtaining battery pack system in the initial state-of-charge SOC at the i-th moment and the first temperature value, I > 0；
First determining module 520, the first temperature value for being got according to acquisition module 510 determine battery pack system Practical SOC；
Computing module 530, initial SOC and the first temperature value for being got according to acquisition module 510 pass through ampere-hour product The theoretical SOC at the i-th moment of calculation of group dividing；
Correction module 540, the reality that theoretical SOC and the first determining module 520 for being obtained according to computing module 530 are obtained Difference revised theory SOC between the SOC of border obtains the i-th moment corresponding revised SOC.
Optionally, the first determining module 520, comprising: the first determination unit 521, first acquisition unit 522 and first calculate Unit 523.
First determination unit 521, for determining battery pack system in the first temperature value according to the first corresponding relationship prestored Under total battery capacity, the first corresponding relationship includes at least corresponding relationship between the first temperature value and total battery capacity；
First acquisition unit 522, for obtaining the remaining battery capacity of battery pack system；
First computing unit 523 is determined for calculating the remaining battery capacity and first that first acquisition unit 522 is got The ratio between total battery capacity that unit 521 obtains, obtains practical SOC.
Optionally, the i-th moment was to obtain module 510, comprising: detection unit 511, second at the time of belonging to startup stage Acquiring unit 512, the second determination unit 513, the second computing unit 514, comparing unit 515, third determination unit 516 and the 4th Determination unit 517.
Detection unit 511, for detecting whether standing duration of the battery pack system before startup stage reaches preset duration；
Second acquisition unit 512, when the result for detecting in detection unit 511 is that standing duration reaches preset duration, Battery pack system is obtained in first total voltage value at the i-th moment, the first SOC and second temperature value, the first total voltage value is to pass through First sensor is collected, and first sensor is used to acquire the whole voltage value of battery pack system；First SOC is to pass through peace When integration method be calculated；Second temperature value and the temperature characteristic manner of the first temperature value are identical or different；
Second determination unit 513, the second temperature value corresponding second for being obtained according to second acquisition unit 512 correspond to Relationship determines that corresponding 2nd SOC of the first total voltage value, the second corresponding relationship include at least the first total voltage value and the 2nd SOC Between corresponding relationship；
Second computing unit 514, for the minimum cell voltage value and maximum cell voltage value according to battery pack system, meter The second total voltage value of battery pack system is calculated, minimum cell voltage value and maximum cell voltage value are acquired by second sensor It arrives, second sensor is used to acquire the voltage value of each single battery in battery pack system；
Comparing unit 515, the first SOC and the second determination unit 513 for getting respectively to second acquisition unit 512 The 2nd obtained SOC, and, the first total voltage value and the second computing unit 514 that second acquisition unit 512 obtains obtain Two total voltage values are compared；
Third determination unit 516 is the first total voltage value less than second total electricity for the comparison result in comparing unit 515 Pressure value, and the first SOC be greater than two SOC when；Alternatively, in the first total voltage value less than the second total voltage value, and the first SOC is greater than When two SOC, determine that the initial SOC at the i-th moment is the first SOC；
4th determination unit 517 is that the first total voltage value is less than or equal to second for the comparison result in comparing unit 515 Total voltage value, and the first SOC be less than or equal to two SOC when；Alternatively, it is more than or equal to the second total voltage value in the first total voltage value, And the first SOC be more than or equal to two SOC when, determine the i-th moment initial SOC be the 2nd SOC.
Optionally, the i-th moment was to obtain module 510 at the time of belonging to the operation phase, comprising: third acquiring unit 518, 5th determination unit 519 and third computing unit 5191.
Third acquiring unit 518, for obtaining battery pack system in the third total voltage value at the i-th moment；
5th determination unit 519, the third for determining that third acquiring unit 518 obtains according to third corresponding relationship are always electric Pressure is worth corresponding 3rd SOC, and third corresponding relationship includes at least the corresponding relationship between third total voltage value and the 3rd SOC；
Third computing unit 5191, the 3rd SOC by being obtained according to the 5th determination unit 519 pass through based on current integration method Calculate the initial SOC at the i-th moment.
Optionally, the i-th moment was to obtain module 510, comprising: the 4th acquiring unit 5192 at the time of belonging to the operation phase With the 4th computing unit 5193.
4th acquiring unit 5192, for obtaining startup stage SOC, startup stage SOC is the cut-off time of startup stage Corresponding SOC；
4th computing unit 5193, the startup stage SOC for being obtained according to the 4th acquiring unit 5192 pass through ampere-hour product The initial SOC at the i-th moment of calculation of group dividing.
Optionally, correction module 540, comprising: Construction of A Model unit 541, the 5th computing unit 542 and amending unit 543.
Construction of A Model unit 541, for passing through minimum two according to the corresponding sampled point of each moment before the i-th moment Multiplication construct mathematical model, sampled point refer to the difference between corresponding theory SOC and practical SOC of each moment；
5th computing unit 542, it is corresponding that the mathematical model for being obtained according to Construction of A Model unit 541 calculated for the i-th moment Modifying factor；
Amending unit 543, for using the calculated modifying factor of the 5th computing unit 542 to the i-th moment corresponding reason It is modified by SOC, obtains revised SOC.
Optionally, be modified using modifying factor theory SOC corresponding to the i-th moment, obtain revised SOC it Afterwards, device further include: detection module 550 and the second determining module 560.
Detection module 550, for whether within a preset range to detect the difference between revised SOC and practical SOC；
Second determining module 560, for the testing result when detection module 550 between revised SOC and practical SOC Difference not within a preset range when, revised SOC is determined as i+1 moment corresponding theory SOC, continues to execute model In structural unit 541 according to the corresponding sampled point of each moment before the i-th moment, pass through least square method structure mathematics mould The step of type.
In conclusion battery SOC correcting device provided in this embodiment, by the theoretical SOC for calculating for the i-th moment；According to First temperature value determines the practical SOC for calculating battery pack system；According to the difference revised theory between practical SOC and theory SOC SOC；BMS is solved when calculating SOC according to current integration method, directly using calculated theory SOC as battery pack system True SOC, caused calculated SOC not accurate enough problem；Since BMS can be according to the of the i-th moment of battery pack system One temperature value determines the practical SOC of battery pack system, when the difference between practical SOC and theory SOC is larger, illustrates BMS Calculated theory SOC by obtaining revised SOC according to difference revised theory SOC, is improved there are biggish bigger than normal The accuracy for the SOC that BMS is obtained.
In addition, by start-up phase, according to the first total voltage value, the second total voltage value, the first SOC of battery pack system The initial SOC of battery pack system is obtained with the 2nd SOC, so that BMS is available to accurate initial SOC, is improved BMS according to initial SOC by current integration method to calculate theoretical SOC when accuracy.
In addition, calculating the theoretical SOC at the i-th moment by the operation phase；It is determined according to the first temperature value and calculates battery pack The practical SOC of system；According to the difference revised theory SOC between practical SOC and theory SOC；BMS is solved according to ampere-hour product When calculation of group dividing SOC, directly using calculated theory SOC as the true SOC of battery pack system, caused calculated SOC Not accurate enough problem；Since BMS can determine battery pack system according to first temperature value at the i-th moment of battery pack system Practical SOC, when the difference between practical SOC and theory SOC is larger, illustrating the calculated theory SOC of BMS, there are biggish inclined Greatly, by obtaining revised SOC, improving the accuracy for the SOC that BMS is obtained according to difference revised theory SOC.
In addition, calculating initial SOC by modified startup stage SOC according in startup stage by the operation phase；Again Theory SOC is calculated according to the initial SOC；Since the initial SOC is obtained according in startup stage revised SOC, thus The accuracy of calculated theory SOC is higher, repairs needed for the operation phase to what theoretical SOC was modified in this way, reducing BMS Positive number, saves process resource.
It should be understood that device provided by the above embodiment is when realizing its function, only with above-mentioned each functional module It divides and carries out for example, can according to need in practical application and be completed by different functional modules above-mentioned function distribution, The internal structure of equipment is divided into different functional modules, to complete all or part of the functions described above.In addition, Apparatus and method embodiment provided by the above embodiment belongs to same design, and specific implementation process is detailed in embodiment of the method, this In repeat no more.
Those of ordinary skill in the art will appreciate that realizing that all or part of the steps of above-described embodiment can pass through hardware It completes, relevant hardware can also be instructed to complete by program, the program can store in a kind of computer-readable In storage medium, storage medium mentioned above can be read-only memory, disk or CD etc..
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.

Claims (8)

1. a kind of battery charge state SOC modification method, which is characterized in that the described method includes:
Battery pack system is obtained in the initial state-of-charge SOC at the i-th moment and the first temperature value, i > 0；
When wherein, when i-th moment is to belong to startup stage at the time of, it is described obtain battery pack system the i-th moment just Beginning state-of-charge SOC, comprising:
Detect whether standing duration of the battery pack system before startup stage reaches preset duration；
When the standing duration reaches the preset duration, the battery pack system is obtained in first total voltage at the i-th moment Value, the first SOC and second temperature value, wherein first total voltage value be it is collected by first sensor, described first Sensor is used to acquire the whole voltage value of the battery pack system；First SOC is calculated by current integration method It arrives；The second temperature value and the temperature characteristic manner of first temperature value are identical or different；
It is worth corresponding second corresponding relationship according to the second temperature, determines corresponding 2nd SOC of first total voltage value, institute The second corresponding relationship is stated including at least the corresponding relationship between first total voltage value and the 2nd SOC；
According to the minimum cell voltage value of the battery pack system and maximum cell voltage value, the of the battery pack system is calculated Two total voltage values, the minimum cell voltage value and the maximum cell voltage value are, institutes collected by second sensor Second sensor is stated for acquiring the voltage value of each single battery in the battery pack system；
Respectively to the first SOC and the 2nd SOC, and, first total voltage value and second total voltage value into Row compares；
First total voltage value be less than second total voltage value, and the first SOC be greater than two SOC when；Or Person, first total voltage value be greater than second total voltage value, and the first SOC be less than two SOC when, determine The initial SOC at i-th moment is the first SOC；
It is less than or equal to second total voltage value in first total voltage value, and the first SOC is less than or equal to described second When SOC；Alternatively, being more than or equal to second total voltage value in first total voltage value, and the first SOC is more than or equal to institute When stating two SOC, determine that the initial SOC at i-th moment is the 2nd SOC；
The practical SOC of the battery pack system is determined according to first temperature value；
The theoretical SOC at i-th moment is calculated by current integration method according to the initial SOC and first temperature value；
The theory SOC is corrected according to the difference between the theory SOC and the practical SOC, it is corresponding to obtain i-th moment Revised SOC.
2. the method according to claim 1, wherein described determine the battery pack according to first temperature value The practical SOC of system, comprising:
According to the first corresponding relationship prestored, total battery capacity of the battery pack system under first temperature value is determined, First corresponding relationship includes at least the corresponding relationship between first temperature value and total battery capacity；
Obtain the remaining battery capacity of the battery pack system；
The ratio between the remaining battery capacity and total battery capacity is calculated, the practical SOC is obtained.
3. the method according to claim 1, wherein when i-th moment being to belong to the operation phase at the time of, The battery pack system that obtains is in the initial state-of-charge SOC at the i-th moment, comprising:
The battery pack system is obtained in the third total voltage value at i-th moment；
Determine that corresponding 3rd SOC of the third total voltage value, the third corresponding relationship are at least wrapped according to third corresponding relationship Include the corresponding relationship between the third total voltage value and the 3rd SOC；
The initial SOC at i-th moment is calculated by the current integration method according to the 3rd SOC.
4. the method according to claim 1, wherein when i-th moment being to belong to the operation phase at the time of, The battery pack system that obtains is in the initial state-of-charge SOC at the i-th moment, comprising:
Startup stage SOC is obtained, the startup stage SOC is the cut-off time corresponding SOC of startup stage；
The initial SOC at i-th moment is calculated by the current integration method according to the startup stage SOC.
5. method according to any one of claims 1 to 4, which is characterized in that described according to the theory SOC and the reality Difference between SOC corrects the theory SOC, obtains i-th moment corresponding revised SOC, comprising:
It is described by least square method construct mathematical model according to the corresponding sampled point of each moment before i-th moment Sampled point refers to the difference between the corresponding theory SOC and practical SOC of each moment；
I-th moment corresponding modifying factor is calculated according to the mathematical model；
It is modified, is obtained described revised using the modifying factor theory SOC corresponding to i-th moment SOC。
6. according to the method described in claim 5, it is characterized in that, described use the modifying factor to i-th moment pair The theory SOC answered is modified, after obtaining the revised SOC, further includes:
Whether within a preset range to detect difference between the revised SOC and the practical SOC；
When the difference between the revised SOC and the practical SOC is not in the preset range, after the amendment SOC be determined as i+1 moment corresponding theory SOC, continue to execute each moment pair according to before i-th moment The sampled point answered, the step of by least square method construct mathematical model.
7. a kind of battery charge state SOC correcting device, which is characterized in that described device includes:
Module is obtained, for obtaining battery pack system in the initial state-of-charge SOC at the i-th moment and the first temperature value, i > 0；
When i-th moment being to belong to startup stage at the time of, the acquisition module include detection unit, second obtain it is single Member, the second determination unit, the second computing unit, comparing unit, third determination unit, the 4th determination unit；
The detection unit, for detecting whether standing duration of the battery pack system before startup stage reaches preset duration；
The second acquisition unit, for obtaining the battery pack system when the standing duration reaches the preset duration In first total voltage value at i-th moment, the first SOC and second temperature value, wherein first total voltage value is by One sensor is collected, and the first sensor is used to acquire the whole voltage value of the battery pack system；Described first SOC is calculated by current integration method；The temperature characteristic manner phase of the second temperature value and first temperature value It is same or different；
Second determination unit determines that described first is total for being worth corresponding second corresponding relationship according to the second temperature Corresponding 2nd SOC of voltage value, second corresponding relationship include at least between first total voltage value and the 2nd SOC Corresponding relationship；
Second computing unit, for according to the minimum cell voltage value of the battery pack system and maximum cell voltage value, The second total voltage value of the battery pack system is calculated, the minimum cell voltage value and the maximum cell voltage value are to pass through Second sensor is collected, and the second sensor is used to acquire the voltage of each single battery in the battery pack system Value；
The comparing unit is used for respectively to the first SOC and the 2nd SOC, and, first total voltage value and institute The second total voltage value is stated to be compared；
The third determination unit, for being less than second total voltage value, and the first SOC in first total voltage value When greater than two SOC；Alternatively, being greater than second total voltage value in first total voltage value, and the first SOC is small When two SOC, determine that the initial SOC at i-th moment is the first SOC；
4th determination unit, for being less than or equal to second total voltage value, and described the in first total voltage value When one SOC is less than or equal to two SOC；Alternatively, it is more than or equal to second total voltage value in first total voltage value, and When first SOC is more than or equal to two SOC, determine that the initial SOC at i-th moment is the 2nd SOC；
First determining module, first temperature value for being got according to the acquisition module determine the battery pack system Practical SOC；
Computing module, the initial SOC and first temperature value for being got according to the acquisition module pass through ampere-hour Integration method calculates the theoretical SOC at i-th moment；
Correction module, the institute that the theory SOC and first determining module for being obtained according to the computing module are obtained The difference stated between practical SOC corrects the theory SOC, obtains i-th moment corresponding revised SOC.
8. a kind of electric car, which is characterized in that the electric car includes battery charge state SOC as claimed in claim 7 Correcting device.
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