CN106932728A - Battery charge state SOC modification methods, device and electric automobile - Google Patents
Battery charge state SOC modification methods, device and electric automobile Download PDFInfo
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- CN106932728A CN106932728A CN201710208991.6A CN201710208991A CN106932728A CN 106932728 A CN106932728 A CN 106932728A CN 201710208991 A CN201710208991 A CN 201710208991A CN 106932728 A CN106932728 A CN 106932728A
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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
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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]
- G01R31/385—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
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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]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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Abstract
The invention discloses a kind of pond state-of-charge SOC modification methods, device and electric automobile, belong to electronic technology field.The 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；The actual 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 according to the difference amendment between the theoretical SOC and the actual SOC, obtains i-th moment corresponding revised SOC.The present invention solve BMS according to current integration method calculate SOC when, the theoretical SOC that will directly calculate as battery pack system true SOC, the caused SOC for calculating not accurate enough problem；Improve the accuracy of the SOC that BMS is obtained.
Description
Technical field
The present embodiments relate to electronic technology field, more particularly to a kind of battery charge state SOC modification methods, device
And electric automobile.
Background technology
With the development of electric vehicle engineering, the use of electric automobile is more and more extensive.Electric automobile is according to battery system
The state-of-charge (state of charge, SOC) of system is estimated that vehicle driving mileage, so that for driver is provided in driving
The important information of journey.Wherein, battery pack system is the major impetus source of electric automobile；SOC refers to the electricity in battery pack system
Pond using a period of time or shelve a period of time after remaining battery capacity be completely filled with electricity with it when total battery capacity ratio.
Electric automobile is generally accumulated by battery management system (battery management system, BMS) according to ampere-hour
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, calculating is integrated to the time by by the charging and discharging currents of battery pack system, so as to estimate battery pack system
Current SOC.The computing formula of current integration method is as follows：
Wherein, SOC is the current SOC, SOC of battery pack system0Be the initial SOC of battery pack system, i (t) be electric current with
Time t change function, x be when battery pack system in the course of the work when, C for battery pack system total electricity.
When determining SOC by current integration method due to BMS, it is necessary to accurately during collecting work each moment electric current
Value, when the current value of BMS collections is not accurate enough, the working time of battery pack system is more long, the cumulative errors of the SOC for calculating
It is bigger.
The content of the invention
In order to solve BMS by the larger problem of the cumulative errors of current integration method calculating SOC, the SOC for obtaining, the present invention
Embodiment provides a kind of battery SOC modification method and device.The technical scheme is as follows：
First aspect, there is provided a kind of battery SOC modification method, methods described 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；
The actual 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 according to the difference amendment between the theoretical SOC and the actual SOC, obtains i-th moment
Corresponding revised SOC.
Alternatively, the actual SOC that the battery pack system is determined according to first temperature value, including：
According to the first corresponding relation for prestoring, determine that total battery of the battery pack system under first temperature value holds
Amount, first corresponding relation at least includes the corresponding relation 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 actual SOC is obtained.
Alternatively, i-th moment be belonging to the moment of startup stage, the acquisition battery pack system is at the i-th moment
Initial state-of-charge SOC, including：
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, a SOC and second temperature value, first total voltage value are collected by first sensor, described
First sensor is used to gather the overall magnitude of voltage of the battery pack system；First SOC is integrated by the ampere-hour
What method was calculated；The second temperature value is identical or different with the temperature characteristic manner of first temperature value；
Corresponding second corresponding relation is worth according to the second temperature, first total voltage value corresponding second is determined
SOC, second corresponding relation at least includes the corresponding relation between first total voltage value and the 2nd SOC；
Minimum cell voltage value and maximum cell voltage value according to the battery pack system, calculate the battery pack system
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 gather the magnitude of voltage of each cell in the battery pack system；
Respectively to a SOC and the 2nd SOC, and, first total voltage value and second total voltage
Value is compared；
Second total voltage value is less than in first total voltage value, and a SOC is more than the 2nd SOC
When；Or, second total voltage value is less than in first total voltage value, and a SOC is more than the 2nd SOC
When, the described initial SOC for determining i-th moment is a SOC；
Second total voltage value, and a SOC are less than or equal to less than or equal to described in first total voltage value
During two SOC；Or, first total voltage value be more than or equal to second total voltage value, and a SOC more than etc.
When two SOC, the described initial SOC for determining i-th moment is the 2nd SOC.
Alternatively, i-th moment be belonging to the moment of operation phase, the acquisition battery pack system is at the i-th moment
Initial state-of-charge SOC, including：
Obtain threeth total voltage value of the battery pack system at i-th moment；
Corresponding 3rd SOC of 3rd total voltage value is determined according to the 3rd corresponding relation, the 3rd corresponding relation is extremely
Include the corresponding relation between the 3rd total voltage value and the 3rd SOC less；
The described initial SOC at i-th moment is calculated by the current integration method according to the 3rd SOC.
Alternatively, i-th moment be belonging to the moment of operation phase, the acquisition battery pack system is at the i-th moment
Initial state-of-charge SOC, including：
Startup stage SOC is obtained, the startup stage SOC is the cut-off time corresponding SOC of startup stage；
The described initial SOC at i-th moment is calculated by the current integration method according to the startup stage SOC.
Alternatively, theory SOC described in the difference amendment according between the theoretical SOC and the actual SOC, obtains
I-th moment corresponding revised SOC, including：
According to each moment corresponding sampled point before i-th moment, by least square method construct mathematical model,
The sampled point refers to the difference between each moment corresponding theoretical SOC and actual SOC；
I-th moment corresponding modifying factor is calculated according to the Mathematical Modeling；
It is modified using the modifying factor theoretical SOC corresponding to i-th moment, after obtaining the amendment
SOC.
Alternatively, it is described to be modified using the modifying factor theoretical SOC corresponding to i-th moment, obtain
To after the revised SOC, also include：
Detect difference between the revised SOC and the actual SOC whether within a preset range；
When the difference between the revised SOC and the actual SOC is not in the preset range, repaiied described
SOC after just is defined as i+1 moment corresponding theoretical SOC, when continuing executing with each according to before i-th moment
Corresponding sampled point is carved, the step of by least square method construct mathematical model.
Second aspect, there is provided a kind of battery SOC correcting device, described device includes：
Acquisition module, 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 determines the battery pack
The actual SOC of system；
Computing module, described 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；
Correcting module, described theoretical SOC and first determining module for being obtained according to the computing module are obtained
Described actual SOC between difference amendment described in theory SOC, obtain i-th moment corresponding revised SOC.
Alternatively, first determining module, including：
First determining unit, for according to the first corresponding relation for prestoring, determining the battery pack system described first
Total battery capacity under temperature value, first corresponding relation at least include first temperature value and total battery capacity it
Between corresponding relation；
First acquisition unit, the remaining battery capacity for obtaining the battery pack system；
First computing unit, for calculating the ratio between the remaining battery capacity and total battery capacity, obtains
The actual SOC.
Alternatively, i-th moment be belonging to the moment of startup stage, the acquisition module, including：
Detection unit, for detecting it is default whether standing duration of the battery pack system before the startup stage reaches
Duration；
Second acquisition unit, for when the standing duration reaches the preset duration, obtaining the battery pack system
The first total voltage value, a SOC and second temperature value at i-th moment, first total voltage value are passed by first
What sensor was collected, the first sensor is used to gather the overall magnitude of voltage of the battery pack system；First SOC is
It is calculated by the current integration method；The second temperature value is identical with the temperature characteristic manner of first temperature value
Or it is different；
Second determining unit, for being worth corresponding second corresponding relation according to the second temperature, determines that described first is total
Corresponding 2nd SOC of magnitude of voltage, second corresponding relation at least includes between first total voltage value and the 2nd SOC
Corresponding relation；
Second computing unit, for the minimum cell voltage value according to 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
What second sensor was collected, the second sensor is used to gather the voltage of each cell in the battery pack system
Value；
Comparing unit, for respectively to a SOC and the 2nd SOC, and, first total voltage value and institute
The second total voltage value is stated to be compared；
3rd determining unit, for being less than second total voltage value, and a SOC in first total voltage value
During more than two SOC；Or, second total voltage value is less than in first total voltage value, and a SOC is big
When two SOC, the described initial SOC for determining i-th moment is a SOC；
4th determining 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；Or, 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, the described initial SOC for determining i-th moment is the 2nd SOC.
Alternatively, i-th moment be belonging to the moment of operation phase, the acquisition module, including：
3rd acquiring unit, for obtaining threeth total voltage value of the battery pack system at i-th moment；
5th determining unit, for determining corresponding 3rd SOC of the 3rd total voltage value, institute according to the 3rd corresponding relation
State the corresponding relation that the 3rd corresponding relation is at least included between the 3rd total voltage value and the 3rd SOC；
3rd computing unit, the institute for calculating i-th moment by the current integration method according to the 3rd SOC
State initial SOC.
Alternatively, i-th moment be belonging to the moment of operation phase, the acquisition module, including：
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
Described initial SOC.
Alternatively, the correcting module, including：
Construction of A Model unit, for according to each moment corresponding sampled point before i-th moment, by a most young waiter in a wineshop or an inn
Multiplication construct mathematical model, the sampled point refers to the difference between each moment corresponding theoretical SOC and actual SOC
Value；
5th computing unit, for calculating i-th moment corresponding modifying factor according to the Mathematical Modeling；
Amending unit, for being modified using the modifying factor theoretical SOC corresponding to i-th moment,
Obtain the revised SOC.
Alternatively, it is described to be modified using the modifying factor theoretical SOC corresponding to i-th moment, obtain
To after the revised SOC, described device also includes：
Detection module, for detecting the difference between the revised SOC and the actual SOC whether in preset range
It is interior；
Second determining module, for when the difference between the revised SOC and the actual SOC is not described default
In the range of when, the revised SOC is defined as i+1 moment corresponding theoretical SOC, continue executing with the Construction of A Model list
Each moment corresponding sampled point according to before i-th moment in unit, by least square method structure mathematics mould
The step of type.
A kind of third aspect, there is provided electric automobile, the electric automobile includes at least one dress described in second aspect
Put.
The beneficial effect that technical scheme provided in an embodiment of the present invention is brought includes：
By the theoretical SOC for calculating for the i-th moment；Determined to calculate the actual SOC of battery pack system according to the first temperature value；Root
The factually difference revised theory SOC between border SOC and theory SOC；Solve BMS when SOC is calculated according to current integration method, directly
Meet the theoretical SOC that will calculate as the true SOC of battery pack system, the caused SOC for calculating not accurate enough problem；By
The actual SOC of battery pack system can be determined according to first temperature value at the moment of battery pack system i-th in BMS, as actual SOC
When larger with difference between theoretical SOC, illustrate that theoretical SOC that BMS is calculated is present larger bigger than normal, by according to the difference
Revised theory SOC, obtains revised SOC, improves the accuracy of the SOC that BMS is obtained.
Brief description of the drawings
Technical scheme in order to illustrate more clearly the embodiments of the present invention, below will be to that will make needed for embodiment description
Accompanying drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for
For those of ordinary skill in the art, on the premise of not paying creative work, other can also be obtained according to these accompanying drawings
Accompanying drawing.
Fig. 1 is the flow chart of the battery SOC modification method that one embodiment of the invention is provided；
Fig. 2A is the flow chart of the battery SOC modification method that another embodiment of the present invention is provided；
Fig. 2 B are the schematic diagrames of the second corresponding relation that one embodiment of the invention is provided；
Fig. 2 C are the schematic diagrames of the second corresponding relation that one embodiment of the invention is provided；
Fig. 2 D are the schematic diagrames of the second corresponding relation that one embodiment of the invention is provided；
Fig. 2 E are the schematic diagrames of the first corresponding relation that one embodiment of the invention is provided；
Fig. 3 is the flow chart of the battery SOC modification method that another embodiment of the present invention is provided；
Fig. 4 is the flow chart of the battery SOC modification method that another embodiment of the present invention is provided；
Fig. 5 is the block diagram of the battery SOC correcting device that one embodiment of the invention is provided；
Fig. 6 is the block diagram of the battery SOC correcting device that another embodiment of the present invention is provided.
Specific embodiment
Here exemplary embodiment will be illustrated in detail, its example is illustrated in the accompanying drawings.Following description is related to
During accompanying drawing, unless otherwise indicated, the same numbers in different accompanying drawings represent same or analogous key element.Following exemplary embodiment
Described in implementation method do not represent and the consistent all implementation methods of the present invention.Conversely, they be only with it is such as appended
The example of the consistent apparatus and method of some aspects being described in detail in claims, of the invention.
First, to present document relates to several nouns be introduced.
1st, the startup stage of battery pack system：Refer to battery pack system open-circuit voltage (open circuit voltage,
OCV) rise, and the rate of change larger stage.
2nd, the operation phase of battery pack system：Refer to battery pack system OCV persistently more than preset voltage value stage, fortune
Row order section is after the start up period.
3rd, the standing stage of battery pack system：Refer to the stages of the OCV continuously less than preset voltage value of battery pack system, it is quiet
Only the stage is before startup stage.
4th, cell voltage value：The magnitude of voltage of each cell in the battery pack system of electric automobile.
5th, battery consistency is poor：It refer to the difference between the remaining battery capacity between the cell in battery pack system
Value, and/or, the difference between voltage between cell.Generally, the BMS in electric automobile needs to ensure battery consistency
Differ within a preset range, so as to improve the endurance of battery.
Method provided in an embodiment of the present invention, the executive agent of each step is the BMS in electric automobile, and BMS is used to monitor
The state of battery pack system, such as：Monitor static condition, starting state and running status of battery pack system etc., static condition
Refer to that battery pack system is standing stage state in which；Starting state refer to battery pack system startup stage (or, upper electricity
Stage) state in which；Running status refers to battery pack system state in which in the operation phase.Wherein, electric automobile bag
Pure electric automobile, hybrid-electric car etc. are included but are not limited to, the present embodiment is not construed as limiting to this.
Fig. 1 is refer to, the flow chart of the battery SOC modification method provided it illustrates one embodiment of the invention.The party
Method can include following steps：
Step 101, obtains the battery pack system initial SOC and the first temperature value at the i-th moment, i ＞ 0.
Step 102, the actual 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 according to initial SOC and the first temperature value by current integration method.
Alternatively, step 103 can be performed before step 102, it is also possible to be performed after step 102, can also be with
Step 102 is performed simultaneously, and the present embodiment is not construed as limiting to this.
Step 104, according to the difference revised theory SOC between theoretical SOC and actual SOC, obtaining for the i-th moment corresponding repaiies
SOC after just.
In sum, the battery SOC modification method that the present embodiment is provided, by the theoretical SOC for calculating for the i-th moment；According to
First temperature value determines to calculate the actual SOC of battery pack system；According to the difference revised theory between actual SOC and theory SOC
SOC；BMS is solved when SOC is calculated according to current integration method, the theoretical SOC that will directly calculate is used as battery pack system
True SOC, the caused SOC for calculating not accurate enough problem；Because BMS can be according to the of the moment of battery pack system i-th
One temperature value determines the actual SOC of battery pack system, when the difference between actual SOC and theory SOC is larger, illustrates BMS
The theoretical SOC for calculating exists larger bigger than normal, by according to difference revised theory SOC, obtaining revised SOC, improves
The accuracy of the SOC that BMS is obtained.
The invention provides three kinds of methods being corrected to the SOC of battery pack system, the method is respectively used to battery pack
The startup stage (refer to the embodiment shown in Fig. 2A) of system, the operation phase of battery pack system (refer to the reality shown in Fig. 3
Apply example), the startup stage of battery pack system and operation phase (refer to the embodiment shown in Fig. 4), below to these three methods
It is described respectively.
Fig. 2A is refer to, the flow chart of the battery SOC modification method provided it illustrates another embodiment of the present invention.Should
Method is used for the startup stage of battery pack system, and the method includes following steps：
Whether step 201, standing duration of the detection battery pack system before startup stage reaches preset duration.
Wherein, the i-th moment be belonging to the moment of the startup stage of battery pack system.Such as：The initial time of startup stage
(or, the start moment of battery pack system).
Static duration refers to that battery pack system is through passing through to this Startup time since the last shutdown moment
Duration.That is, battery pack system is in the duration in standing stage.In the present embodiment, battery pack system also keeps 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.
Because the OCV of battery pack system is after the standing duration of battery pack system reaches certain numerical value, can just exist with SOC
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
Now the OCV of battery pack system is more stable, and BMS can determine more accurately SOC according to the OCV, now, performs 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 now battery pack system is unstable
Fixed, BMS can not get more accurately SOC according to the OCV, and now, BMS obtains the last time electric automobile moment out of service
Corresponding SOC.Wherein, preset duration is when OCV and SOV have relatively-stationary functional relation, according to the place of electric automobile
Determine in the duration in the stage of standing.
Alternatively, the initial time that BMS can be only in startup stage performs this step；Or, it is also possible in startup stage
In any one moment in addition to initial time perform this step；Or, can also be equal at each moment of startup stage
This step is performed, the present embodiment is not construed as limiting to this.
Step 202, obtains battery pack system in first total voltage value at the i-th moment, a SOC and second temperature value.
First total voltage value (i.e. the OCV of the i-th moment battery pack system) of battery pack system, is passed by first by BMS
What sensor was collected, the first sensor is used to gather the overall magnitude of voltage of battery pack system.
In the first implementation, second temperature value is temperature of the battery pack system that arrives of BMS system acquisitions at the i-th moment
Angle value.
In second implementation, second temperature value be since the initial time of the startup stage of battery pack system to
Untill i-th moment, the average temperature value that BMS systems are calculated according to the temperature value that each moment collects.
First SOC is calculated by BMS by current integration method.The SOC that usual BMS will can be calculated is true
It is set to the real SOC of battery pack system.
Ampere-hour integral formula is as follows, wherein, SOC is a SOC；SOC0Battery pack system startup stage it is initial when
The SOC at quarter, the SOC of the initial time can BMS determined according to the corresponding relation between OCV and SOC；Or, it is also possible to
It is the SOC at last time electric automobile that BMS gets moment out of service, the present embodiment is not construed as limiting to this；The upper limit of integration
Value i refers to the duration passed through to the i-th moment since the initial time of the startup stage of battery pack system；The lower limit 0 of integration
It refer to the initial time of the startup stage of battery pack system；I (t) refers to the function that changes over time of electric current of battery pack system,
The function is that BMS is got by the curent change of monitor in real time battery pack system；C refers to battery pack system total when fully charged
Battery capacity, total battery capacity can be preset in BMS, and be directly obtained by the BMS；Or, or BMS
Determine what is obtained according to the first corresponding relation between second temperature value and total battery capacity, the present embodiment is not construed as limiting to this.
Wherein, the first corresponding relation is used to indicate the corresponding relation between temperature value and total battery capacity.
Step 203, corresponding second corresponding relation is worth according to second temperature, determines the first total voltage value corresponding second
SOC。
Second corresponding relation is used to indicate the corresponding relation between the OCV of battery pack system and SOC, and the second corresponding relation
At least include the corresponding relation between the first total voltage value and the 2nd SOC.
Alternatively, due to battery pack system at different temperature, the corresponding relation between OCV and SOC is also different,
Therefore, in order to obtain first total voltage value corresponding twoth SOC of the battery pack system at the i-th moment exactly, it is preset with BMS
Different temperatures is worth corresponding second corresponding relation, and BMS is worth corresponding second corresponding relation according to second temperature, determines first total electricity
Pressure is worth corresponding 2nd SOC.
Assuming that being preset with corresponding second corresponding relation (as shown in Figure 2 B) when temperature value is 5 DEG C (degree Celsius), temperature in BMS
Corresponding second corresponding relation when corresponding second corresponding relation (as shown in Figure 2 C), temperature value are 35 DEG C when angle value is 25 DEG C
(as shown in Figure 2 D), if BMS gets the first total voltage value for 350V (volt), second temperature value are 5 DEG C, according to Fig. 2 B
The second corresponding relation, BMS determine the 2nd SOC be 37%.
Alternatively, because corresponding second corresponding relation of default different temperatures value in BMS can not possibly be infinitely more, and BMS
The temperature value of the battery pack system for getting may be but various, in order to ensure that it is right that BMS can be determined according to second temperature value
The second corresponding relation answered, BMS can determine the second corresponding relation being closer to according to the second temperature value for getting.
The second corresponding relation that BMS determines to be closer to according to the second temperature value for getting, including：When no pre- in BMS
When depositing corresponding second corresponding relation of the second temperature value for getting, determine in each temperature value that BMS prestores with second temperature
The minimum target temperature value of angle value difference, the second couple that corresponding second corresponding relation of the target temperature value is defined as being closer to
Should be related to.
Alternatively, in order to get accurate 2nd SOC, so as to avoid producing the problem of battery consistency difference,
In this step, BMS can be respectively provided with least two features in the shallower stage in each second corresponding relation for prestoring
Point；Whether the difference being respectively compared between the 2nd SOC for getting SOC corresponding with least two characteristic point is less than or equal to
Predetermined threshold value；When the difference between the 2nd SOC SOC corresponding with least two characteristic point is respectively less than predetermined threshold value, BMS is true
Surely the 2nd SOC for getting is accurate；As the 2nd SOC SOCs corresponding with any one characteristic point at least two characteristic point
Between difference be more than predetermined threshold value when, the corresponding SOC of this feature point is defined as the 2nd SOC by BMS.The present embodiment is not to default
The concrete numerical value of threshold value is construed as limiting.
Assuming that second corresponding relations of the BMS according to Fig. 2 B, the first total voltage value 350V corresponding second for determining
SOC is 37%, and the 350V is in the smoother stage in the second corresponding relation shown in Fig. 2 B, and fisrt feature point is p1, the
Two characteristic points are p2, and predetermined threshold value is 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%, therefore, BMS can determine that the 2nd SOC for getting is accurate.
Step 204, minimum cell voltage value and maximum cell voltage value according to battery pack system, calculates battery pack system
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 gather the magnitude of voltage of each cell in battery pack system.Generally, the monomer electricity that second sensor is collected
Pressure value is closer to the real magnitude of voltage of battery pack system.
BMS calculates the second total voltage value of battery pack system by following formula, wherein, k is series connection in battery pack system
Battery quantity, ULV-CellIt is the minimum cell voltage value of battery pack system；UHV-CellIt is the maximum monomer electricity of battery pack system
Pressure value.
U=k (ULV-Cell+UHV-Cell)/2
Alternatively, step 204 can be performed before step 202 and 203, it is also possible to be held after step 202 and 203
OK, can also simultaneously be performed with step 202 and 203, the present embodiment is not construed as limiting to this.
Step 205, respectively to a SOC and the 2nd SOC, and, the first total voltage value and the second total voltage value are compared
Compared with.
Because first sensor and second sensor are typically different, this may cause first sensor and second to pass
Sensor sampling precision and/or sampling period are different, and the cell voltage value that second sensor is collected is closer to battery pack
The real magnitude of voltage of system, therefore, when BMS is according to minimum cell voltage value and maximum cell voltage value, second for calculating
When total voltage value is more than the first total voltage value, illustrate that the real magnitude of voltage of battery pack system is bigger than normal, according to the second corresponding relation
Understand, the real SOC (that is, a SOC) of battery pack system should be bigger than normal, now, if a SOC is more than the 2nd SOC, explanation
The SOC that BMS is calculated is more accurate, now performs step 206；If a SOC is less than or equal to the 2nd SOC, BMS is illustrated
The SOC for calculating is inaccurate, should correct a SOC, now, performs step 207.
When BMS is according to minimum cell voltage value and maximum cell voltage value, the second total voltage value for calculating is less than first
During total voltage value, illustrate that the real magnitude of voltage of battery pack system is less than normal, it can be seen from the second corresponding relation, battery pack system
Real SOC (that is, a SOC) should be less than normal, now, if a SOC is less than the 2nd SOC, illustrates BMS is calculated first
SOC is more accurate, now performs step 206；If a SOC is more than or equal to the 2nd SOC, the SOC that BMS is calculated is illustrated
It is inaccurate, a SOC should be corrected, now, perform step 207.
In the present embodiment, by comparing the size between the first total voltage value and the second total voltage value, and a SOC with
Size between 2nd SOC, it may be determined that go out the SOC for whether needing modified BM S to calculate.
Step 206, when the first total voltage value is less than the second total voltage value, and a SOC more than two SOC；Or,
When first total voltage value is less than the second total voltage value, and a SOC more than two SOC, it is determined that initial SOC is a SOC, perform
Step 208.
Step 207, the second total voltage value is less than or equal in the first total voltage value, and a SOC is less than or equal to the 2nd SOC
When；Or, when the first total voltage value is more than or equal to the second total voltage value, and a SOC more than or equal to two SOC, it is determined that just
Beginning SOC is the 2nd SOC.
Step 208, obtains the first temperature value of the i-th moment battery pack system.
In the first implementation, the first temperature value is the temperature of the i-th moment battery pack system that BMS system acquisitions are arrived
Value.
In second implementation, the first temperature value be since the initial time of the startup stage of battery pack system to
Untill i-th moment, the average temperature value that BMS systems are calculated according to the temperature value that each moment collects.
Alternatively, the characteristic manner of the first temperature value and second temperature value can be with identical, such as：First temperature value and second
Temperature value is characterized using the first implementation；Or, the first temperature value can also with the characteristic manner of second temperature value
Difference, such as：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.
Alternatively, this step can be performed before step 201-207, it is also possible to be performed after step 201-207, also
Can simultaneously be performed with step 201-207, the present embodiment is not construed as limiting to this.
Step 209, total battery of the corresponding battery pack system of the first temperature value is determined according to the first corresponding relation for prestoring
Capacity.
Due to the temperature in battery pack system it is different when, the corresponding total battery capacity of the battery pack system is also different,
Therefore, by prestoring the first corresponding relation in BMS, battery pack system under Current Temperatures is determined according to first corresponding relation
Total battery capacity, improve BMS according to total battery capacity by current integration method calculate SOC when accuracy.
Wherein, the first corresponding relation at least includes the corresponding relation between the first temperature value and total battery capacity.Assuming that BMS
In the first corresponding relation for prestoring as shown in Figure 2 E.
Step 210, obtains the remaining battery capacity of battery pack system.
BMS obtains the battery capacity of battery pack system consumption by the state of monitor in real time battery pack system, will total electricity
The remaining battery capacity of the battery pack system that the battery capacity that tankage subtracts the consumption is obtained.
Step 211, calculates the ratio between remaining battery capacity and total battery capacity, obtains actual SOC.
BMS calculates actual 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.
Actual SOC=(CT0-ΔC)/CT0
Step 212, the theoretical SOC at the i-th moment is calculated according to initial SOC and the first temperature value by current integration method.
BMS calculates theory SOC by current integration method.Ampere-hour integral formula is as follows, wherein, SOC is theory SOC, SOC0
For the initial SOC that step 206 or step 207 are obtained；Upper limit of integral value i refer to battery pack system startup stage it is initial when
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 in the startup stage of battery pack system is opened
Begin the duration passed through to the i-th -1 moment；I (t) refers to the function that changes over time of electric current of battery pack system；C is BMS according to
Total battery capacity that one corresponding relation and the first temperature value are determined.
Step 213, according to the difference revised theory SOC between theoretical SOC and actual SOC, obtaining for the i-th moment corresponding repaiies
SOC after just.
BMS according to the difference revised theory SOC between theoretical SOC and actual SOC, after obtaining the corresponding amendment of the i-th moment
SOC, including：According to each moment corresponding sampled point before the i-th moment, by least square method construct mathematical model；
I-th moment corresponding modifying factor is calculated according to Mathematical Modeling；Carried out using modifying factor theoretical SOC corresponding to the i-th moment
Amendment, obtains revised SOC.Wherein, sampled point refers to the difference between each moment corresponding theoretical SOC and actual SOC.
Alternatively, the amendment due to BMS at the i-th moment to theoretical SOC may not reach user's expected effect, therefore,
It is modified using modifying factor theoretical SOC corresponding to the i-th moment, is obtained after revised SOC, is also included：Detection
Whether within a preset range the difference between revised SOC and actual SOC；Difference between revised SOC and actual SOC
Value not within a preset range when, revised SOC is defined as i+1 moment corresponding theoretical SOC, continue executing with according to predetermined
Each moment corresponding sampled point before moment, the step of by least square method construct mathematical model.The present embodiment is not right
The setting means of preset range is construed as limiting, such as：Preset range is [- 5% ,+5%].
In sum, the battery SOC modification method that the present embodiment is provided, by start-up phase, according to battery pack system
The first total voltage value, the second total voltage value, a SOC and the 2nd SOC obtain the initial SOC of battery pack system so that BMS
Accurately initial SOC can be got, BMS is improve and theoretical SOC is being calculated by current integration method according to initial SOC
When accuracy.
Fig. 3 is refer to, the flow chart of the battery SOC modification method provided it illustrates another embodiment of the present invention.Should
Method is used for the operation phase of battery pack system, based on the embodiment shown in Fig. 2A, as the replaceable step of step 201-207
Suddenly, the method includes following steps：
Step 301, obtains the 3rd total voltage value of battery pack system.
3rd 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 the 3rd total voltage value is determined according to the 3rd corresponding relation.
SOC0It is SOC of the battery pack system in the initial time of operation phase, the SOC of the initial time can be BMS roots
Determine according to the 3rd corresponding relation between OCV and SOC.Wherein, the 3rd corresponding relation can be identical with the second corresponding relation,
Can be identical with the second corresponding relation, the present embodiment is not construed as limiting to this.
Step 303, initial SOC is calculated according to the 3rd SOC by current integration method.
The ampere-hour integral formula that current integration method is used is as follows, wherein, SOC is initial SOC；SOC0It is the 3rd SOC；Product
The higher limit i for dividing refers to that the initial time in the operation phase of battery pack system starts the duration passed through to the i-th moment；Integration
Lower limit 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 is changed over time
Function, the function is that BMS is got by the curent change of monitor in real time battery pack system；C refers to that battery pack system fills
Total battery capacity during full electricity, total battery capacity can be preset in BMS, and be directly obtained by the BMS；Or,
Can BMS according between current temperature value and total battery capacity corresponding relation determine obtain, the present embodiment to this not
It is construed as limiting.
In sum, the battery SOC modification method that the present embodiment is provided, by the operation phase, calculating the reason at the i-th moment
By SOC；Determined to calculate the actual SOC of battery pack system according to the first temperature value；According to the difference between actual SOC and theory SOC
Value revised theory SOC；BMS is solved when SOC is calculated according to current integration method, the theoretical SOC that will directly calculate is used as electricity
The true SOC of pond system system, the caused SOC for calculating not accurate enough problem；Because BMS can be according to battery pack system
First temperature value at i moment determines the actual SOC of battery pack system, when the difference between actual SOC and theory SOC is larger
When, illustrate that theoretical SOC that BMS is calculated is present larger bigger than normal, by according to difference revised theory SOC, after being corrected
SOC, improve the accuracy of the SOC that BMS is obtained.
In order to further improve the accuracy of the SOC that BMS gets, the embodiment that BMS can be according to Fig. 2A is obtained
Revised SOC, above-mentioned initial SOC is calculated by current integration method.
Fig. 4 is refer to, the flow chart of the battery SOC modification method provided it illustrates another embodiment of the present invention.Should
Method is used for the operation phase of battery pack system, based on the embodiment shown in Fig. 2A, as the replaceable step of step 201-207
Suddenly, the method includes following steps：
Step 401, obtains startup stage SOC, and startup stage SOC is the cut-off time corresponding SOC of startup stage.
In one case, BMS is modified in the startup stage of battery pack system to theoretical SOC.Now, BMS is in fortune
The startup stage SOC that row order section gets is the SOC by amendment in startup stage.That is, step 213 is obtained SOC or warp
The SOC that other modification methods are obtained is crossed, the present embodiment is not construed as limiting to this.
In another case, BMS is not modified in the startup stage of battery pack system to theoretical SOC, but directly
The theoretical SOC that output is calculated by current integration method.Now, the startup stage SOC that BMS gets in the operation phase is reason
By SOC.
Step 402, the initial SOC at the i-th moment is calculated according to startup stage SOC by current integration method.
The ampere-hour integral formula that current integration method is used is as follows, wherein, SOC is initial SOC；SOC0It is startup stage
SOC；The higher limit i of integration refers to that the initial time in the operation phase of battery pack system starts the duration passed through to the i-th moment；
The lower limit i of integration refers to the initial time of the operation phase of battery pack system；I (t) refer to the electric current of battery pack system at any time
Between change function, the function is that BMS is got by the curent change of monitor in real time battery pack system；C refers to battery pack
Total battery capacity when system is fully charged, total battery capacity can be preset in BMS, and be directly obtained by the BMS；Or
Person, or BMS determine what is obtained according to the corresponding relation between current temperature value and total battery capacity, the present embodiment pair
This is not construed as limiting.
In sum, the battery SOC modification method that the present embodiment is provided, by the operation phase, according in startup stage
Initial SOC is calculated by the startup stage SOC for correcting；Theory SOC is calculated further according to the initial SOC；Because the initial SOC is root
According to what is obtained in startup stage revised SOC, so as to the accuracy of the theoretical SOC for calculating is higher, so, BMS is reduced
The times of revision being modified to theoretical SOC needed for the operation phase, saves process resource.
Following is apparatus of the present invention embodiment, can be used for performing the inventive method embodiment.For apparatus of the present invention reality
The details not disclosed in example is applied, the inventive method embodiment is refer to.
Fig. 5 is refer to, the block diagram of the battery SOC correcting device provided it illustrates one embodiment of the invention.The device
With the function of performing above method example, function can be realized by hardware, it is also possible to performed corresponding software by hardware and realized.
The device can include：Acquisition module 510, the first determining module 520, computing module 530 and correcting module 540.
Acquisition module 510, 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 determines battery pack system
Actual SOC；
Computing module 530, initial SOC and the first temperature value for being got according to acquisition module 510 are accumulated by ampere-hour
The theoretical SOC at the moment of calculation of group dividing i-th；
Correcting module 540, for the reality that the theoretical SOC obtained according to computing module 530 and the first determining module 520 are obtained
Difference revised theory SOC between the SOC of border, obtains the i-th moment corresponding revised SOC.
In sum, the battery SOC correcting device that the present embodiment is provided, by the theoretical SOC for calculating for the i-th moment；According to
First temperature value determines to calculate the actual SOC of battery pack system；According to the difference revised theory between actual SOC and theory SOC
SOC；BMS is solved when SOC is calculated according to current integration method, the theoretical SOC that will directly calculate is used as battery pack system
True SOC, the caused SOC for calculating not accurate enough problem；Because BMS can be according to the of the moment of battery pack system i-th
One temperature value determines the actual SOC of battery pack system, when the difference between actual SOC and theory SOC is larger, illustrates BMS
The theoretical SOC for calculating exists larger bigger than normal, by according to difference revised theory SOC, obtaining revised SOC, improves
The accuracy of the SOC that BMS is obtained.
Fig. 6 is refer to, the block diagram of the battery SOC correcting device provided it illustrates one embodiment of the invention.The device
With the function of performing above method example, function can be realized by hardware, it is also possible to performed corresponding software by hardware and realized.
The device can include：Acquisition module 510, the first determining module 520, computing module 530 and correcting module 540.
Acquisition module 510, 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 determines battery pack system
Actual SOC；
Computing module 530, initial SOC and the first temperature value for being got according to acquisition module 510 are accumulated by ampere-hour
The theoretical SOC at the moment of calculation of group dividing i-th；
Correcting module 540, for the reality that the theoretical SOC obtained according to computing module 530 and the first determining module 520 are obtained
Difference revised theory SOC between the SOC of border, obtains the i-th moment corresponding revised SOC.
Alternatively, the first determining module 520, including：First determining unit 521, first acquisition unit 522 and first are calculated
Unit 523.
First determining unit 521, for according to the first corresponding relation for prestoring, determining battery pack system in the first temperature value
Under total battery capacity, the first corresponding relation at least includes corresponding relation between the first temperature value and total battery capacity；
First acquisition unit 522, the remaining battery capacity for obtaining battery pack system；
First computing unit 523, determines for calculating the remaining battery capacity and first that first acquisition unit 522 gets
Ratio between total battery capacity that unit 521 is obtained, obtains actual SOC.
Alternatively, the i-th moment be belonging to the moment of startup stage, acquisition module 510, including：Detection unit 511, second
Acquiring unit 512, the second determining unit 513, the second computing unit 514, comparing unit 515, the 3rd determining unit 516 and the 4th
Determining 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 being detected in detection unit 511 reaches preset duration to stand duration,
Battery pack system is obtained in first total voltage value at the i-th moment, a SOC and second temperature value, the first total voltage value is to pass through
What first sensor was collected, first sensor is used to gather the overall magnitude of voltage of battery pack system；First SOC is by peace
When integration method be calculated；Second temperature value is identical or different with the temperature characteristic manner of the first temperature value；
Second determining unit 513, corresponding second correspondence of second temperature value for being obtained according to second acquisition unit 512
Relation, determines corresponding 2nd SOC of the first total voltage value, and the second corresponding relation at least includes the first total voltage value and the 2nd SOC
Between corresponding relation；
Second computing unit 514, for the minimum cell voltage value according to battery pack system and maximum cell voltage value, meter
The second total voltage value of battery pack system is calculated, minimum cell voltage value and maximum cell voltage value are gathered by second sensor
Arrive, second sensor is used to gather the magnitude of voltage of each cell in battery pack system；
Comparing unit 515, for the SOC for being got to second acquisition unit 512 respectively and the second determining unit 513
The 2nd SOC for obtaining, and, the first total voltage value and the second computing unit 514 that second acquisition unit 512 is obtained obtain
Two total voltage values are compared；
3rd determining unit 516, for the comparative result in comparing unit 515 for the first total voltage value is total less than second electric
Pressure value, and a SOC be more than two SOC when；Or, the second total voltage value is less than in the first total voltage value, and a SOC is more than
During two SOC, the initial SOC for determining for the i-th moment is a SOC；
4th determining unit 517, for the comparative result in comparing unit 515 for the first total voltage value is less than or equal to second
Total voltage value, and a SOC be less than or equal to two SOC when；Or, 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.
Alternatively, the i-th moment be belonging to the moment of operation phase, acquisition module 510, including：3rd acquiring unit 518,
5th determining unit 519 and the 3rd computing unit 5191.
3rd acquiring unit 518, for obtaining threeth total voltage value of the battery pack system at the i-th moment；
5th determining unit 519, for determining the 3rd total electricity that the 3rd acquiring unit 518 is obtained according to the 3rd corresponding relation
Pressure is worth corresponding 3rd SOC, and the 3rd corresponding relation at least includes the corresponding relation between the 3rd total voltage value and the 3rd SOC；
3rd computing unit 5191, by the 3rd SOC that is obtained according to the 5th determining unit 519 by based on current integration method
Calculate the initial SOC at the i-th moment.
Alternatively, the i-th moment be belonging to the moment of operation phase, acquisition module 510, including：4th acquiring unit 5192
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 is accumulated by ampere-hour
The initial SOC at the moment of calculation of group dividing i-th.
Alternatively, correcting module 540, including：Construction of A Model unit 541, the 5th computing unit 542 and amending unit 543.
Construction of A Model unit 541, for according to each moment corresponding sampled point before the i-th moment, by a most young waiter in a wineshop or an inn
Multiplication construct mathematical model, sampled point refers to the difference between each moment corresponding theoretical SOC and actual SOC；
5th computing unit 542, the Mathematical Modeling for being obtained according to Construction of A Model unit 541 calculates the i-th moment correspondence
Modifying factor；
Amending unit 543, for the modifying factor that is calculated using the 5th computing unit 542 to the i-th moment corresponding reason
It is modified by SOC, obtains revised SOC.
Alternatively, be modified using modifying factor theoretical SOC corresponding to the i-th moment, obtain revised SOC it
Afterwards, the device also includes：The determining module 560 of detection module 550 and second.
Detection module 550, for whether within a preset range to detect the difference between revised SOC and actual SOC；
Second determining module 560, for being between revised SOC and actual SOC when the testing result of detection module 550
Difference not within a preset range when, revised SOC is defined as i+1 moment corresponding theoretical SOC, continue executing with model
In structural unit 541 according to each moment corresponding sampled point before the i-th moment, by least square method structure mathematics mould
The step of type.
In sum, the battery SOC correcting device that the present embodiment is provided, by the theoretical SOC for calculating for the i-th moment；According to
First temperature value determines to calculate the actual SOC of battery pack system；According to the difference revised theory between actual SOC and theory SOC
SOC；BMS is solved when SOC is calculated according to current integration method, the theoretical SOC that will directly calculate is used as battery pack system
True SOC, the caused SOC for calculating not accurate enough problem；Because BMS can be according to the of the moment of battery pack system i-th
One temperature value determines the actual SOC of battery pack system, when the difference between actual SOC and theory SOC is larger, illustrates BMS
The theoretical SOC for calculating exists larger bigger than normal, by according to difference revised theory SOC, obtaining revised SOC, improves
The accuracy of the SOC that BMS is obtained.
In addition, by start-up phase, the first total voltage value, the second total voltage value according to battery pack system, a SOC
The initial SOC of battery pack system is obtained with the 2nd SOC so that BMS can get accurately initial SOC, improve
BMS according to initial SOC by current integration method to calculate theoretical SOC when accuracy.
In addition, by the operation phase, calculating the theoretical SOC at the i-th moment；Determined to calculate battery pack according to the first temperature value
The actual SOC of system；According to the difference revised theory SOC between actual SOC and theory SOC；BMS is solved to be accumulated according to ampere-hour
During calculation of group dividing SOC, true SOCs, the caused SOC that calculates of the theoretical SOC that will directly calculate as battery pack system
Not accurate enough problem；Because BMS can determine battery pack system according to first temperature value at the moment of battery pack system i-th
Actual SOC, when the difference between actual SOC and theory SOC is larger, illustrates that theoretical SOC that BMS is calculated is present larger inclined
Greatly, by according to difference revised theory SOC, obtaining revised SOC, improve the accuracy of the SOC that BMS is obtained.
In addition, by the operation phase, initial SOC being calculated by the startup stage SOC of amendment according in startup stage；Again
Theory SOC is calculated according to the initial SOC；Because the initial SOC is obtained according in startup stage revised SOC, so that
The accuracy of the theoretical SOC for calculating is higher, so, reduces BMS needed for the operation phase to repairing that theoretical SOC is modified
Positive number of times, saves process resource.
It should be noted that：Above-described embodiment provide device when its function is realized, only with above-mentioned each functional module
Division is carried out for example, in practical application, can be completed by different functional modules as needed and by above-mentioned functions distribution,
Will the internal structure of equipment be divided into different functional modules, to complete all or part of function described above.In addition,
The apparatus and method embodiment that above-described embodiment is provided belongs to same design, and it implements process and refers to embodiment of the method, this
In repeat no more.
One of ordinary skill in the art will appreciate that realizing that all or part of step of above-described embodiment can be by hardware
To complete, it is also possible to instruct the hardware of correlation to complete by program, described program can be stored in a kind of computer-readable
In storage medium, storage medium mentioned above can be read-only storage, disk or CD etc..
The foregoing is only presently preferred embodiments of the present invention, be not intended to limit the invention, it is all it is of the invention spirit and
Within principle, any modification, equivalent substitution and improvements made etc. should be included within the scope of the present invention.
Claims (9)
1. a kind of battery charge state SOC modification methods, it is characterised in that methods described 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；
The actual 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 according to the difference amendment between the theoretical SOC and the actual SOC, obtains the i-th moment correspondence
Revised SOC.
2. method according to claim 1, it is characterised in that described that the battery pack is determined according to first temperature value
The actual SOC of system, including：
According to the first corresponding relation for prestoring, total battery capacity of the battery pack system under first temperature value is determined,
First corresponding relation at least includes the corresponding relation 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 actual SOC is obtained.
3. method according to claim 1, it is characterised in that i-th moment is belonging to the moment of startup stage, described
Initial state-of-charge SOC of the battery pack system at the i-th moment is obtained, including：
Detect whether standing duration of the battery pack system before the startup stage reaches preset duration；
When the standing duration reaches the preset duration, obtain the battery pack system at i-th moment first is total
Magnitude of voltage, a SOC and second temperature value, first total voltage value are collected by first sensor, and described first
Sensor is used to gather the overall magnitude of voltage of the battery pack system；First SOC is by the current integration method meter
Obtain；The second temperature value is identical or different with the temperature characteristic manner of first temperature value；
Corresponding second corresponding relation is worth according to the second temperature, corresponding 2nd SOC of first total voltage value, institute is determined
State the corresponding relation that the second corresponding relation is at least included between first total voltage value and the 2nd SOC；
Minimum cell voltage value according to the battery pack system and maximum cell voltage value, calculate the of the battery pack system
Two total voltage values, the minimum cell voltage value and the maximum cell voltage value are collected by second sensor, institute
Second sensor is stated for gathering the magnitude of voltage of each cell in the battery pack system；
Respectively to a SOC and the 2nd SOC, and, first total voltage value and second total voltage value are entered
Row compares；
When first total voltage value is less than second total voltage value, and a SOC more than two SOC；Or
Person, when first total voltage value is less than second total voltage value, and a SOC more than two SOC, it is determined that
The described initial SOC at i-th moment is a SOC；
Second total voltage value is less than or equal in first total voltage value, and a SOC is less than or equal to described second
During SOC；Or, it is more than or equal to second total voltage value in first total voltage value, and a SOC is more than or equal to institute
When stating two SOC, the described initial SOC for determining i-th moment is the 2nd SOC.
4. method according to claim 1, it is characterised in that i-th moment is belonging to the moment of operation phase, described
Initial state-of-charge SOC of the battery pack system at the i-th moment is obtained, including：
Obtain threeth total voltage value of the battery pack system at i-th moment；
Corresponding 3rd SOC of 3rd total voltage value is determined according to the 3rd corresponding relation, the 3rd corresponding relation is at least wrapped
Include the corresponding relation between the 3rd total voltage value and the 3rd SOC；
The described initial SOC at i-th moment is calculated by the current integration method according to the 3rd SOC.
5. method according to claim 1, it is characterised in that i-th moment is belonging to the moment of operation phase, described
Initial state-of-charge SOC of the battery pack system at the i-th moment is obtained, including：
Startup stage SOC is obtained, the startup stage SOC is the cut-off time corresponding SOC of startup stage；
The described initial SOC at i-th moment is calculated by the current integration method according to the startup stage SOC.
6. according to any described method of claim 1 to 5, it is characterised in that described according to the theoretical SOC and the reality
Theory SOC described in difference amendment between SOC, obtains i-th moment corresponding revised SOC, including：
It is described by least square method construct mathematical model according to each moment corresponding sampled point before i-th moment
Sampled point refers to the difference between each moment corresponding theoretical SOC and actual SOC；
I-th moment corresponding modifying factor is calculated according to the Mathematical Modeling；
It is modified using the modifying factor theoretical SOC corresponding to i-th moment, obtains described revised
SOC。
7. method according to claim 6, it is characterised in that it is described using the modifying factor to i-th moment pair
The described theoretical SOC for answering is modified, and obtains after the revised SOC, also includes：
Detect difference between the revised SOC and the actual SOC whether within a preset range；
When the difference between the revised SOC and the actual SOC is not in the preset range, after the amendment
SOC be defined as i+1 moment corresponding theoretical SOC, continue executing with described each moment pair according to before i-th moment
The sampled point answered, the step of by least square method construct mathematical model.
8. a kind of battery charge state SOC correcting devices, it is characterised in that described device includes：
Acquisition module, 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 determines the battery pack system
Actual SOC；
Computing module, ampere-hour is passed through for the described initial SOC got according to the acquisition module and first temperature value
Integration method calculates the theoretical SOC at i-th moment；
Correcting module, the institute that the described theoretical SOC for being obtained according to the computing module is obtained with first determining module
Theory SOC described in the difference amendment between actual SOC is stated, i-th moment corresponding revised SOC is obtained.
9. a kind of electric automobile, it is characterised in that the electric automobile includes the battery charge state SOC described in claim 8
Correcting device.
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| CN112578282A (en) * | 2020-12-02 | 2021-03-30 | 重庆峘能电动车科技有限公司 | Method for estimating battery SOC, electric equipment and storage medium |
| CN113002363A (en) * | 2021-03-03 | 2021-06-22 | 一汽解放汽车有限公司 | Method and device for correcting battery charge, vehicle and medium |
| CN113820605A (en) * | 2021-09-30 | 2021-12-21 | 蜂巢能源科技(无锡)有限公司 | Battery SOC correction method and device and computer readable storage medium |
| CN115840148A (en) * | 2022-01-07 | 2023-03-24 | 宁德时代新能源科技股份有限公司 | Method and device for determining state of charge of battery, electronic equipment and storage medium |
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| CN112345954B (en) * | 2020-10-21 | 2024-04-09 | 一汽解放汽车有限公司 | Battery life prediction method, device, electronic equipment and medium |
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| CN115840148B (en) * | 2022-01-07 | 2024-01-23 | 宁德时代新能源科技股份有限公司 | Method and device for determining battery charge state, electronic equipment and storage medium |
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