CN106707187B - Method and device for determining target SOC of battery - Google Patents

Method and device for determining target SOC of battery Download PDF

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Publication number
CN106707187B
CN106707187B CN201611215342.0A CN201611215342A CN106707187B CN 106707187 B CN106707187 B CN 106707187B CN 201611215342 A CN201611215342 A CN 201611215342A CN 106707187 B CN106707187 B CN 106707187B
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battery
soc
current
target
electric quantity
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CN106707187A (en
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颜昱
谭俐
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Ningde Shidai Runzhi Software Technology Co ltd
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Contemporary Amperex Technology Co Ltd
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Priority to PCT/CN2017/093168 priority patent/WO2018120771A1/en
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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]
    • G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
    • G01R31/3835—Arrangements for monitoring battery or accumulator variables, e.g. SoC involving only voltage measurements

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  • General Physics & Mathematics (AREA)
  • Secondary Cells (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The embodiment of the invention provides a method and a device for determining a target SOC of a battery. On one hand, in the embodiment of the invention, when current flows through the battery, the electric quantity of the battery at each sampling point is collected, and then the current state of the battery is determined according to the electric quantity of the battery at each sampling point; thus, a target correspondence is selected from at least two correspondences between the specified SOC and the voltage, according to the current state of the battery; and determining the target SOC according to the target corresponding relation. Therefore, the technical scheme provided by the embodiment of the invention can solve the problem that the accuracy of the target SOC obtained based on the corresponding relation between the SOC and the voltage calibrated under the static condition is low in the prior art.

Description

Method and device for determining target SOC of battery
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of batteries, in particular to a method and a device for determining a target SOC of a battery.
[ background of the invention ]
At present, accurate acquisition Of State Of Charge (SOC) Of a battery is a problem to be solved in the field Of batteries. In the prior art, the SOC data of the battery is generally obtained by obtaining the voltage value of the battery under the static condition based on the corresponding relationship between the SOC and the voltage calibrated under the static condition; herein, the static condition specifically means a condition in which no current passes through the battery.
In the prior art, since the corresponding relationship between the SOC and the voltage is obtained by maintaining the SOC and the voltage for a long enough time under the static condition, the acquired voltage value also needs to be maintained for a long enough time under the static condition to ensure that the voltage obtained at this time is stable, and thus accurate target SOC data can be obtained based on the voltage value. However, this sufficient time is generally in hours, and generally exceeds 3 hours in actual use.
In the process of implementing the invention, the inventor finds that at least the following problems exist in the prior art:
in practical applications, there is generally no situation where there is no current passing through the cell and remaining for many hours. Therefore, in the prior art, the method for determining the target SOC based on the corresponding relationship between the SOC and the voltage calibrated under the static condition cannot obtain the accurate target SOC.
[ summary of the invention ]
In view of this, embodiments of the present invention provide a method and an apparatus for determining a target SOC of a battery, so as to solve the problem in the prior art that an accuracy of a target SOC obtained based on a correspondence between an SOC and a voltage calibrated under a static condition is low.
In one aspect, an embodiment of the present invention provides a method for determining a target SOC of a battery, including:
when current flows through a battery, collecting the electric quantity of the battery at each sampling point;
determining the current state of the battery according to the electric quantity of the battery at each sampling point;
selecting a target correspondence from at least two correspondences between a specified SOC and a voltage according to a current state of the battery;
and determining a target SOC according to the target corresponding relation.
The above aspect and any possible implementation manner further provide an implementation manner, wherein determining the current state of the battery according to the electric quantity of the battery at each sampling point includes:
determining the type of the electric quantity of the battery at each sampling point as charging electric quantity or discharging electric quantity;
accumulating the electric quantity with the same type to obtain the accumulated sum of the electric quantity corresponding to each type;
when the accumulated sum of the charging electric quantity of the battery is larger than the accumulated sum of the discharging electric quantity of the battery, determining that the current state of the battery is a charging state; or when the accumulated sum of the charging electric quantity of the battery is smaller than or equal to the accumulated sum of the discharging electric quantity of the battery, determining that the current state of the battery is the discharging state.
The above aspect and any possible implementation manner further provide an implementation manner, where acquiring the electric quantity of the battery at each sampling point includes:
collecting the electric quantity of the battery at each sampling point;
collecting the current of the battery and the temperature of the battery;
and within a specified time, when the current of the battery is lower than a preset current threshold and the temperature of the battery is higher than a preset temperature threshold, stopping collecting the electric quantity of the battery at each sampling point to obtain a plurality of electric quantity values of the battery at each sampling point.
The above aspect and any possible implementation further provide an implementation in which, according to the current state, selecting a target correspondence from at least two correspondences between a specified SOC and a voltage includes:
when the current state of the battery is a charging state, selecting a first corresponding relation from at least two corresponding relations between a specified SOC and a specified voltage as a target corresponding relation, wherein the first corresponding relation is the corresponding relation between the SOC and the voltage of the battery obtained in the process of charging the battery by adopting a specified current; or,
when the current state of the battery is a discharging state, selecting a second corresponding relation from at least two corresponding relations between the specified SOC and the voltage as a target corresponding relation, wherein the second corresponding relation is the corresponding relation between the SOC and the voltage of the battery obtained in the process of discharging the battery by adopting the specified current.
The above-described aspect and any possible implementation manner further provide an implementation manner, where determining a target SOC according to the target correspondence includes:
collecting the current voltage of the battery;
and when the current voltage of the battery is lower than a preset voltage threshold, determining the SOC corresponding to the current voltage of the battery in the target corresponding relation as the target SOC according to the target corresponding relation.
The above-described aspects and any possible implementations further provide an implementation, and the method further includes:
acquiring the current SOC of the battery;
acquiring a difference value between the current SOC of the battery and the target SOC;
and when the difference is larger than a preset difference threshold value, replacing the current SOC of the battery with the target SOC.
One of the above technical solutions has the following beneficial effects:
in the embodiment of the invention, when current flows through the battery, the electric quantity of the battery at each sampling point is collected, and then the current state of the battery is determined according to the electric quantity of the battery at each sampling point; thus, according to the current state, selecting a target correspondence from at least two correspondences between the specified SOC and the voltage; and then, determining a target SOC according to the target corresponding relation. In the embodiment of the invention, the target SOC of the battery is obtained by determining the current state of the battery and then selecting the corresponding relation between the SOC applicable to the current state of the battery and the voltage based on the determined current state; compared with the method for acquiring the target SOC in the prior art, the technical scheme provided by the embodiment of the invention can be executed under the condition that the battery is in a charging state or a discharging state, and does not need to carry out standing or other processing on the battery, so that the aim of acquiring the target SOC can be fulfilled in a shorter time. Therefore, the technical scheme provided by the embodiment of the invention improves the accuracy of determining the target SOC, shortens the determination time, and solves the problem that the accuracy of the target SOC obtained based on the corresponding relation between the SOC and the voltage calibrated under the static condition is lower in the prior art.
In another aspect, an embodiment of the present invention provides a device for determining a target SOC of a battery, including:
the acquisition unit is used for acquiring the electric quantity of the battery at each sampling point when current flows through the battery;
the determining unit is used for determining the current state of the battery according to the electric quantity of the battery at each sampling point;
a selection unit for selecting a target correspondence from at least two correspondences between a specified SOC and a voltage according to a current state of the battery;
the determining unit is further configured to determine a target SOC according to the target correspondence.
The above-described aspects and any possible implementation further provide an implementation, where the apparatus further includes a first obtaining unit;
the determining unit is used for determining the type of the electric quantity of the battery at each sampling point as charging electric quantity or discharging electric quantity;
the first acquisition unit is used for accumulating the electric quantities with the same type to obtain the electric quantity accumulated sum corresponding to each type;
the determining unit is further configured to determine that the current state of the battery is a charging state when the accumulated sum of the charging electric quantities of the battery is greater than the accumulated sum of the discharging electric quantities of the battery; or, the controller is further configured to determine that the current state of the battery is the discharging state when the accumulated sum of the charging electric quantities of the battery is less than or equal to the accumulated sum of the discharging electric quantities of the battery.
The above-described aspects and any possible implementation further provide an implementation, where the acquisition unit is configured to:
collecting the electric quantity of the battery at each sampling point;
collecting the current of the battery and the temperature of the battery;
and within a specified time, when the current of the battery is lower than a preset current threshold and the temperature of the battery is higher than a preset temperature threshold, stopping collecting the electric quantity of the battery at each sampling point to obtain a plurality of electric quantity values of the battery at each sampling point.
The above-mentioned aspect and any possible implementation further provide an implementation, where the selecting unit is configured to:
when the current state of the battery is a charging state, selecting a first corresponding relation from at least two corresponding relations between a specified SOC and a specified voltage as a target corresponding relation, wherein the first corresponding relation is the corresponding relation between the SOC and the voltage of the battery obtained in the process of charging the battery by adopting a specified current; or,
when the current state of the battery is a discharging state, selecting a second corresponding relation from at least two corresponding relations between the specified SOC and the voltage as a target corresponding relation, wherein the second corresponding relation is the corresponding relation between the SOC and the voltage of the battery obtained in the process of discharging the battery by adopting the specified current.
The above aspect and any possible implementation manner further provide an implementation manner, where the acquisition unit is further configured to acquire a current voltage of the battery;
the determining unit is configured to determine, according to the target correspondence, that the SOC corresponding to the current voltage of the battery in the target correspondence is the target SOC when the current voltage of the battery is lower than a preset voltage threshold.
The above-described aspects and any possible implementations further provide an implementation in which the apparatus:
a second acquisition unit configured to acquire a current SOC of the battery;
the second obtaining unit is further configured to obtain a difference between the current SOC of the battery and the target SOC;
and the correction unit is used for replacing the current SOC of the battery with the target SOC when the difference is larger than a preset difference threshold.
One of the above technical solutions has the following beneficial effects:
in the embodiment of the invention, when current flows through the battery, the acquisition unit in the target SOC determination device acquires the electric quantity of the battery at each sampling point; then, a determining unit in the device determines the current state of the battery according to the electric quantity of the battery at each sampling point; thus, a selection unit in the device selects a target correspondence from at least two correspondences between the specified SOC and the voltage according to the current state; further, a determination unit in the device determines a target SOC based on the target correspondence. In the embodiment of the invention, the target SOC of the battery is obtained by determining the current state of the battery and then selecting the corresponding relation between the SOC applicable to the current state of the battery and the voltage based on the determined current state; compared with the method for acquiring the target SOC in the prior art, the technical scheme provided by the embodiment of the invention can be executed under the condition that the battery is in a charging state or a discharging state, so that the battery does not need to be stood or otherwise processed, and the aim of acquiring the target SOC can be fulfilled in a shorter time. Therefore, the technical scheme provided by the embodiment of the invention improves the accuracy of determining the target SOC, shortens the determination time, and solves the problem that the accuracy of the target SOC obtained based on the corresponding relation between the SOC and the voltage calibrated under the static condition is lower in the prior art.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.
Fig. 1 is a schematic flowchart of a first embodiment of a method for determining a target SOC of a battery according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the corresponding relationship between SOC and voltage in the battery according to the embodiment of the present invention;
fig. 3 is a schematic flowchart of a second embodiment of a method for determining a target SOC of a battery according to an embodiment of the present invention;
fig. 4 is a functional block diagram of an apparatus for determining a target SOC of a battery according to an embodiment of the present invention.
[ detailed description ] embodiments
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It should be understood that although the terms first, second, third, etc. may be used to describe the corresponding relationships in the embodiments of the present invention, the corresponding relationships should not be limited to these terms. These terms are only used to distinguish one correspondence relationship from another. For example, the first corresponding relationship may also be referred to as a second corresponding relationship, and similarly, the second corresponding relationship may also be referred to as a first corresponding relationship without departing from the scope of the embodiments of the present invention.
The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.
Example one
In order to solve the above problems in the prior art, an embodiment of the present invention provides a method for determining a target SOC, please refer to fig. 1, which is a schematic flow chart of a first embodiment of the method for determining a target SOC of a battery according to an embodiment of the present invention, as shown in fig. 1, the method includes the following steps:
and S101, collecting the electric quantity of the battery at each sampling point when current flows through the battery.
Specifically, when current flows through the battery, the battery can be in a charging state, or the battery can be in a discharging state, and at the moment, electric quantity can be collected at each sampling point in the battery.
In the embodiment of the invention, when the electric quantity of the battery at each sampling point is collected, the electric quantity can be acquired by integrating the current with the time; alternatively, the present invention may also be implemented by some devices for detecting the battery level in real time, which is not particularly limited in the embodiment of the present invention.
It should be noted that the sampling point may be preset according to actual needs, which is not particularly limited in the embodiment of the present invention; in addition, the number of the sampling points is at least one, and in the actual application process, the number and the position of the sampling points can be preset according to actual needs, which is not particularly limited in the embodiment of the present invention.
Specifically, in the embodiment of the present invention, the electric quantity of the battery at each sampling point is collected, so as to determine the current state of the battery according to the electric quantity of the battery.
Therefore, in the embodiment of the invention, when the electric quantity of the battery at each sampling point is collected, a target condition can be preset according to actual needs, when the battery meets the preset target condition, the collection of the electric quantity of the battery at each sampling point is stopped, and then the current state of the battery is determined according to each collected electric quantity before the collection of the electric quantity of the battery is stopped.
For example, when the electric quantity of the battery at each sampling point is collected by integrating the current with respect to time, the current flowing through the battery at each sampling point can be used for integrating the time, and when the battery meets a preset target condition, the integration of the current with respect to time is stopped, so that the electric quantity of the battery at each sampling point is obtained.
Specifically, the target condition may be preset according to actual needs, for example, the target condition may be preset according to the current flowing through the battery, and for example, the target condition may be: when the current flowing through the battery is lower than a preset current threshold value, stopping collecting the electric quantity of the battery; alternatively, the target condition may also be preset according to the temperature of the battery, for example, the target condition may be: and when the temperature of the battery reaches a preset temperature threshold value, stopping collecting the electric quantity of the battery. It should be understood that the above examples are only used to illustrate how to preset the target condition for stopping collecting the electric quantity of the battery, and are not used to limit the application, and the specific content of the preset target condition is not particularly limited in the embodiments of the present invention.
In a specific implementation process, the implementation manner of collecting the electric quantity of the battery at each sampling point may include, but is not limited to, the following manners:
collecting the electric quantity of the battery at each sampling point; collecting the current of the battery and the temperature of the battery; and then, within a specified time, when the current of the battery is lower than a preset current threshold and the temperature of the battery is higher than a preset temperature threshold, stopping collecting the electric quantity of the battery at each sampling point to obtain a plurality of electric quantity values of the battery at each sampling point.
For example, for a lithium iron phosphate battery, the temperature threshold of the battery may be preset to be 13 ℃, the current threshold of the battery may also be preset to be 2A, and the specified time duration is 3 min. Therefore, in the process of determining the target SOC of the battery, only when the temperature of the battery is always higher than 13 ℃ within 3min and the current flowing through the battery is always lower than 2A within 3min, the collection of the electric quantity of the battery at each sampling point is stopped, and the current state of the battery is determined according to the collected electric quantity.
And S102, determining the current state of the battery according to the electric quantity of the battery at each sampling point.
Specifically, after the electric quantity of the battery at each sampling point is collected, considering that the battery may have actions of external discharging and/or internal charging during the process of collecting the electric quantity, the collected electric quantity may include a charging electric quantity and a discharging electric quantity. It can be understood that the charging capacity is the capacity of the battery that flows into the battery when the battery is charged; the discharge electric quantity is the electric quantity flowing out of the battery when the battery discharges outwards.
Therefore, the implementation manner of determining the current state of the battery according to the electric quantity of the battery at each sampling point may include, but is not limited to, the following manners:
determining the type of the electric quantity of the battery at each sampling point as charging electric quantity or discharging electric quantity;
accumulating the electric quantity with the same type to obtain the accumulated sum of the electric quantity corresponding to each type;
and determining the current state of the battery according to the accumulated sum of the electric quantity.
Specifically, when determining the current state of the battery according to the electric quantity accumulated sum, the following two situations may be included:
in case one, when the accumulated sum of the charged electric quantities of the battery is greater than the accumulated sum of the discharged electric quantities of the battery, it is determined that the current state of the battery is the charged state.
And in the second situation, when the accumulated sum of the charging electric quantity of the battery is less than or equal to the accumulated sum of the discharging electric quantity of the battery, determining that the current state of the battery is the discharging state.
S103, selecting a target corresponding relation from at least two corresponding relations between the specified SOC and the voltage according to the current state.
Specifically, in the embodiment of the present invention, at least two designated corresponding relationships may be established in advance. Specifically, the specific description will be made by taking the example of establishing a correspondence relationship between the SOC and the voltage of the battery when the battery is in a discharge state in advance. Specifically, when the corresponding relationship between the SOC and the voltage in the state is preset, the voltage of the battery in the discharge state may be collected and the SOC of the battery in the discharge state may be collected in the process of discharging the battery by using the specified current, and then the corresponding relationship between the SOC and the voltage of the battery in the discharge state may be established according to the collected voltage and the SOC of the battery.
It should be noted that, in the process of presetting the corresponding relationship between the SOC and the voltage of the battery in each state, the adopted current may be selected according to actual needs. In a specific implementation process, the specified current can be set to be a smaller current value, so that the battery can be in a pseudo-static state in which a smaller current flows, and the accuracy of the obtained corresponding relation between the SOC and the voltage of the battery is ensured.
For example, in one particular implementation, the specified current may be set to 0.005C. At this time, the corresponding relation between the SOC and the voltage of the battery in the discharging state can be collected in the process of constant current discharging of the battery by adopting the current of 0.005C; alternatively, the corresponding relationship between the SOC and the voltage of the battery in the charging state may be collected during the constant current charging of the battery with the current of 0.005C.
And, the number of correspondence relationships between the SOC and the voltage of the battery in each state that can be obtained is at least one, depending on the value of the current used in charging or discharging the battery. For example, when the battery is subjected to constant current discharge with a current of 0.005C, a correspondence relationship between the SOC and the voltage of the battery when the battery is in a discharge state may be established as a correspondence relationship a in the process; when the battery is subjected to constant current discharge by using a current of 0.008C, the correspondence relationship between the SOC and the voltage of the battery when the battery is in a discharge state can be established as the correspondence relationship B, and thus, the number of the correspondence relationships between the SOC and the voltage of the battery when the battery is in a discharge state can be obtained as 2.
Specifically, the corresponding relationship between the SOC and the voltage in the battery may be represented as a relationship curve as shown in fig. 2, where fig. 2 is a schematic diagram of the corresponding relationship between the SOC and the voltage in the battery according to the embodiment of the present invention. It should be noted that fig. 2 is only a specific expression of the correspondence between the SOC and the voltage in the battery, and is not intended to limit the correspondence between the SOC and the voltage in the embodiment of the present invention.
Specifically, in the embodiment of the present invention, the selecting the target corresponding relationship from at least two corresponding relationships between the specified SOC and the specified voltage according to the determined current state of the battery may include the following two implementation manners:
in the first mode, when the current state of the battery is the charging state, the first corresponding relation is selected from at least two corresponding relations between the specified SOC and the voltage as the target corresponding relation.
The first corresponding relation is the corresponding relation between the SOC and the voltage of the battery obtained in the process of charging the battery by adopting the specified current.
And secondly, when the current state of the battery is a discharging state, selecting a second corresponding relation from at least two corresponding relations between the specified SOC and the voltage as a target corresponding relation.
The second corresponding relation is the corresponding relation between the SOC and the voltage of the battery obtained in the process of discharging the battery by adopting the specified current.
It should be noted that, when the corresponding relationship is selected in the two implementation manners, if the number of the corresponding relationships existing when the battery is in the discharge state in the at least two specified corresponding relationships is also at least two, at this time, a current equal to or similar to the current threshold preset in S101 is selected, and the corresponding relationship obtained when the battery is charged is the first corresponding relationship; and selecting a current equal to or similar to the current threshold preset in the step S101, wherein the corresponding relation obtained when the battery is discharged is a second corresponding relation.
And S104, determining the target SOC according to the target corresponding relation.
In the embodiment of the present invention, according to the target correspondence, implementation manners of determining the target SOC may include, but are not limited to, the following two types:
and in the mode A, the current voltage of the battery is collected, and when the collected current voltage of the battery is lower than a preset voltage threshold value, the SOC corresponding to the current voltage of the battery in the target corresponding relation is determined as the target SOC.
And the mode B is to collect the voltage of the battery and detect whether the voltage of the battery meets the specified condition, so that when the voltage of the battery meets the specified condition, the target SOC is determined according to the target corresponding relation.
At this time, whether the voltage of the battery meets the preset specified condition or not can be determined according to the preset specified condition, and when the voltage of the battery meets the specified condition is detected, the SOC corresponding to the current voltage of the battery in the target corresponding relationship is determined to be the target SOC according to the target corresponding relationship. In the actual application process, the specified conditions can be preset according to actual needs.
In a specific implementation process, when the voltage of the battery is always lower than a preset voltage threshold within a preset time range, it is detected that the voltage of the battery meets a specified condition. Or when the voltage of the battery is higher than a preset voltage threshold value within a preset time length range, the voltage of the battery is detected not to meet the specified condition.
Specifically, the specified duration and the voltage threshold can be preset according to actual needs, and meanwhile, the time when the specified duration begins to be timely can also be preset according to actual needs.
For example, the timing of the specified time period may be started at the moment when the electric quantity of the battery stops being collected, then, when the voltage of the battery is higher than the preset voltage threshold value within the specified time period, the timing is restarted, and when the voltage of the battery is always lower than the preset voltage threshold value within the next timely specified time period, it is detected that the voltage of the battery meets the specified condition; or, when the voltage of the battery is higher than the preset voltage threshold value within the specified time period, the execution judgment of the determining method is exited, and the operation is started from the step S101 again.
In a specific implementation, the voltage threshold of the battery may be preset to be 3.26V, and the specified time period is 3 min.
In a specific implementation, the current SOC of the battery may also be modified based on the target SOC.
Specifically, according to the target SOC, the implementation manner of correcting the current SOC of the battery may include the following steps:
acquiring the current SOC of the battery;
acquiring a difference value between the current SOC and a target SOC of the battery;
and when the difference is larger than a preset difference threshold value, replacing the current SOC of the battery with the target SOC.
Or when the difference is smaller than or equal to the preset difference threshold, the current SOC of the battery is not replaced by the target SOC, and the current SOC of the battery is kept unchanged.
In the practical application process, the difference threshold may also be preset according to actual needs, for example, the difference threshold of the lithium iron phosphate battery may be preset to be 2%. It can be understood that the preset difference threshold represents an error range that can be received by the current SOC of the battery, and when the difference between the current SOC of the battery and the target SOC exceeds the threshold, the current SOC value of the battery is corrected only if the error ratio of the current SOC value of the battery is considered to be larger; otherwise, the current SOC value error of the battery is considered to be smaller, and correction can not be carried out.
The technical scheme of the embodiment of the invention has the following beneficial effects:
in the embodiment of the invention, the electric quantity of the battery at each sampling point is collected, and then the current state of the battery is determined according to the electric quantity of the battery at each sampling point; thus, according to the current state, selecting a target correspondence from at least two correspondences between the specified SOC and the voltage; and determining the target SOC according to the target corresponding relation. In the embodiment of the invention, the target SOC of the battery is obtained by determining the current state of the battery and then selecting the corresponding relation between the SOC applicable to the current state of the battery and the voltage based on the determined current state; compared with the method for acquiring the target SOC in the prior art, the technical scheme provided by the embodiment of the invention can be executed under the condition that the battery is in a charging state or a discharging state, and does not need to carry out standing or other processing on the battery, so that the aim of acquiring the target SOC can be fulfilled in a shorter time. Therefore, the technical scheme provided by the embodiment of the invention improves the accuracy of determining the target SOC, shortens the determination time, and solves the problem that the accuracy of the target SOC obtained based on the corresponding relation between the SOC and the voltage calibrated under the static condition is lower in the prior art.
Example two
Based on the method for determining the target SOC of the battery provided in the first embodiment, the embodiment of the present invention provides a specific implementation manner of the method for determining the target SOC of the battery.
Specifically, please refer to fig. 3, which is a flowchart illustrating a second embodiment of the method for determining a target SOC of a battery according to the embodiment of the present invention, as shown in fig. 3, the method includes the following steps:
and S301, when current flows through the battery, collecting the electric quantity of the battery at 50 sampling points in real time.
S302, judging whether the current of the battery is smaller than a current threshold value and the temperature of the battery is larger than a temperature threshold value within a specified time length; if yes, executing S303; if not, S301 is executed.
And S303, determining the type of the electric quantity of the battery at the 50 sampling points.
And S304, accumulating the electric quantities with the same type to obtain the accumulated sum of the charging electric quantity and the accumulated sum of the discharging electric quantity.
S305, judging whether the accumulated sum of the discharging electric quantity is larger than or equal to the accumulated sum of the charging electric quantity; if yes, executing S306; if not, go to S315.
S306, determining that the second corresponding relation is the target corresponding relation of the battery.
And S307, collecting the voltage of the battery and starting timing.
S308, judging whether the voltage of the battery is lower than a voltage threshold value all the time within a preset time length range; if yes, go to S309; if not, S301 is executed.
S309, determining the target SOC according to the current voltage of the battery and the second corresponding relation.
And S310, acquiring the current SOC of the battery.
And S311, acquiring a difference value between the current SOC and the target SOC of the battery.
S312, judging whether the difference value is larger than a difference value threshold value; if yes, go to S313; if not, go to step S314.
S313, the current SOC of the battery is replaced with the target SOC.
And S314, keeping the current SOC of the battery unchanged.
S315, determining that the first corresponding relation is the target corresponding relation of the battery.
And S316, collecting the voltage of the battery and starting timing.
S317, judging whether the voltage of the battery is always lower than a voltage threshold value within a preset time length range; if yes, go to S318; if not, S301 is executed.
S318, determining the target SOC according to the current voltage of the battery and the first corresponding relation.
It is to be understood that the method for determining the target SOC of the battery provided in the embodiment of the present invention is only a specific implementation manner of the method for determining the target SOC of the battery provided in the embodiment one, and is not limited otherwise.
The technical scheme of the embodiment of the invention has the following beneficial effects:
in the embodiment of the invention, when current flows through the battery, the target SOC of the battery is obtained by determining the current state of the battery and then selecting the corresponding relation between the SOC and the voltage applicable to the current state of the battery based on the determined current state; compared with the method for acquiring the target SOC in the prior art, the technical scheme provided by the embodiment of the invention can be executed under the condition that the battery is in a charging state or a discharging state, and does not need to carry out standing or other processing on the battery, so that the aim of acquiring the target SOC can be fulfilled in a shorter time. Therefore, the technical scheme provided by the embodiment of the invention improves the accuracy of determining the target SOC, shortens the determination time, and solves the problem that the accuracy of the target SOC obtained based on the corresponding relation between the SOC and the voltage calibrated under the static condition is lower in the prior art.
EXAMPLE III
Based on the method for determining the target SOC of the battery provided in the first embodiment, embodiments of the present invention further provide an apparatus for implementing the steps and methods in the first embodiment.
Please refer to fig. 4, which is a functional block diagram of an apparatus for determining a target SOC of a battery according to an embodiment of the present invention. As shown in fig. 4, the apparatus includes:
the acquisition unit 41 is used for acquiring the electric quantity of the battery at each sampling point when current flows through the battery;
the determining unit 42 is used for determining the current state of the battery according to the electric quantity of the battery at each sampling point;
a selection unit 43 for selecting a target correspondence from at least two correspondences between the specified SOC and the voltage according to the current state of the battery;
the determining unit 42 is further configured to determine a target SOC according to the target corresponding relationship.
In a specific implementation, the apparatus further includes a first obtaining unit 44;
a determination unit 42, configured to determine the type of the electric quantity of the battery at each sampling point as a charging electric quantity or a discharging electric quantity;
a first obtaining unit 44, configured to accumulate the electric quantities with the same type to obtain an electric quantity accumulated sum corresponding to each type;
a determining unit 42, configured to determine that the current state of the battery is the charging state when the accumulated sum of the charging electric quantities of the battery is greater than the accumulated sum of the discharging electric quantities of the battery; or, the controller is further configured to determine that the current state of the battery is the discharge state when the accumulated sum of the charged electric quantities of the battery is less than or equal to the accumulated sum of the discharged electric quantities of the battery.
Specifically, the acquisition unit 41 is configured to:
collecting the electric quantity of the battery at each sampling point;
collecting the current of the battery and the temperature of the battery;
and within the specified time, when the current of the battery is lower than a preset current threshold and the temperature of the battery is higher than a preset temperature threshold, stopping collecting the electric quantity of the battery at each sampling point to obtain a plurality of electric quantity values of the battery at each sampling point.
Specifically, in the embodiment of the present invention, the selecting unit 43 is configured to:
when the current state of the battery is a charging state, selecting a first corresponding relation from at least two corresponding relations between a specified SOC and a voltage as a target corresponding relation, wherein the first corresponding relation is the corresponding relation between the SOC and the voltage of the battery obtained in the process of charging the battery by adopting a specified current; or,
and when the current state of the battery is a discharging state, selecting a second corresponding relation from at least two corresponding relations between the specified SOC and the voltage as a target corresponding relation, wherein the second corresponding relation is the corresponding relation between the SOC and the voltage of the battery obtained in the process of discharging the battery by adopting the specified current.
In a specific implementation process, the collecting unit 41 is further configured to collect a current voltage of the battery;
and the determining unit 42 is configured to determine, according to the target correspondence, that the SOC corresponding to the current voltage of the battery in the target correspondence is the target SOC when the current voltage of the battery is lower than a preset voltage threshold.
Specifically, the apparatus may further include:
a second acquisition unit 46 for acquiring the current SOC of the battery;
a second obtaining unit 46, further configured to obtain a difference between the current SOC and the target SOC of the battery;
and a correction unit 47 for replacing the current SOC of the battery with the target SOC when the difference is greater than a preset difference threshold.
Since each unit in the present embodiment can execute the method shown in fig. 2, reference may be made to the related description of fig. 2 for a part of the present embodiment that is not described in detail.
The technical scheme of the embodiment of the invention has the following beneficial effects:
in the embodiment of the invention, when current flows through the battery, the acquisition unit in the target SOC determination device acquires the electric quantity of the battery at each sampling point; then, a determining unit in the device determines the current state of the battery according to the electric quantity of the battery at each sampling point; thus, a selection unit in the device selects a target correspondence from at least two correspondences between the specified SOC and the voltage according to the current state; further, a determination unit in the apparatus determines a target SOC based on the target correspondence relationship. In the embodiment of the invention, when current flows through the battery, the target SOC of the battery is obtained by determining the current state of the battery and then selecting the corresponding relation between the SOC and the voltage applicable to the current state of the battery based on the determined current state; compared with the method for acquiring the target SOC in the prior art, the technical scheme provided by the embodiment of the invention can be executed under the condition that the battery is in a charging state or a discharging state, and does not need to carry out standing or other processing on the battery, so that the aim of acquiring the target SOC can be fulfilled in a shorter time. Therefore, the technical scheme provided by the embodiment of the invention improves the accuracy of determining the target SOC, shortens the determination time, and solves the problem that the accuracy of the target SOC obtained based on the corresponding relation between the SOC and the voltage calibrated under the static condition is lower in the prior art.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the embodiments provided in the present invention, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and there may be other divisions in actual implementation, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
The integrated unit implemented in the form of a software functional unit may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) or a Processor (Processor) to execute some steps of the methods according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (8)

1. A method of determining a target state of charge, SOC, for a battery, the method comprising:
when current flows through a battery, collecting the electric quantity of the battery at each sampling point, and collecting the current of the battery and the temperature of the battery;
within a specified time, when the current of the battery is lower than a preset current threshold and the temperature of the battery is higher than a preset temperature threshold, stopping collecting the electric quantity of the battery at each sampling point to obtain a plurality of electric quantity values of the battery at each sampling point;
determining the current state of the battery according to the electric quantity of the battery at each sampling point;
selecting a target correspondence from at least two correspondences between a specified SOC and a voltage according to the current state of the battery and the current threshold;
determining a target SOC according to the target corresponding relation;
determining the current state of the battery according to the electric quantity of the battery at each sampling point, wherein the determining comprises the following steps:
determining the type of the electric quantity of the battery at each sampling point as charging electric quantity or discharging electric quantity;
accumulating the electric quantity with the same type to obtain the accumulated sum of the electric quantity corresponding to each type;
when the accumulated sum of the charging electric quantity of the battery is larger than the accumulated sum of the discharging electric quantity of the battery, determining that the current state of the battery is a charging state; or when the accumulated sum of the charging electric quantity of the battery is smaller than or equal to the accumulated sum of the discharging electric quantity of the battery, determining that the current state of the battery is the discharging state.
2. The method of claim 1, wherein selecting a target correspondence from at least two correspondences between a specified SOC and a voltage based on the current state comprises:
when the current state of the battery is a charging state, selecting a first corresponding relation from at least two corresponding relations between a specified SOC and a specified voltage as a target corresponding relation, wherein the first corresponding relation is the corresponding relation between the SOC and the voltage of the battery obtained in the process of charging the battery by adopting a specified current; or,
when the current state of the battery is a discharging state, selecting a second corresponding relation from at least two corresponding relations between the specified SOC and the voltage as a target corresponding relation, wherein the second corresponding relation is the corresponding relation between the SOC and the voltage of the battery obtained in the process of discharging the battery by adopting the specified current.
3. The method of claim 1, wherein determining a target SOC based on the target correspondence comprises:
collecting the current voltage of the battery;
and when the current voltage of the battery is lower than a preset voltage threshold, determining the SOC corresponding to the current voltage of the battery in the target corresponding relation as the target SOC according to the target corresponding relation.
4. The method of claim 1, further comprising:
acquiring the current SOC of the battery;
acquiring a difference value between the current SOC of the battery and the target SOC;
and when the difference is larger than a preset difference threshold value, replacing the current SOC of the battery with the target SOC.
5. A device for determining a target SOC of a battery, the device comprising:
the acquisition unit is used for acquiring the electric quantity of the battery at each sampling point when current flows through the battery, and acquiring the current of the battery and the temperature of the battery;
the acquisition unit is further used for stopping acquiring the electric quantity of the battery at each sampling point within a specified time when the current of the battery is lower than a preset current threshold and the temperature of the battery is higher than a preset temperature threshold, so as to obtain a plurality of electric quantity values of the battery at each sampling point;
the determining unit is used for determining the current state of the battery according to the electric quantity of the battery at each sampling point;
a selection unit configured to select a target correspondence from at least two correspondences between a specified SOC and a voltage according to a current state of the battery and the current threshold;
the determining unit is further configured to determine a target SOC according to the target correspondence;
the device also comprises a first acquisition unit;
the determining unit is used for determining the type of the electric quantity of the battery at each sampling point as charging electric quantity or discharging electric quantity;
the first acquisition unit is used for accumulating the electric quantities with the same type to obtain the electric quantity accumulated sum corresponding to each type;
the determining unit is further configured to determine that the current state of the battery is a charging state when the accumulated sum of the charging electric quantities of the battery is greater than the accumulated sum of the discharging electric quantities of the battery; or, the controller is further configured to determine that the current state of the battery is the discharging state when the accumulated sum of the charging electric quantities of the battery is less than or equal to the accumulated sum of the discharging electric quantities of the battery.
6. The apparatus of claim 5, wherein the selection unit is configured to:
when the current state of the battery is a charging state, selecting a first corresponding relation from at least two corresponding relations between a specified SOC and a specified voltage as a target corresponding relation, wherein the first corresponding relation is the corresponding relation between the SOC and the voltage of the battery obtained in the process of charging the battery by adopting a specified current; or,
when the current state of the battery is a discharging state, selecting a second corresponding relation from at least two corresponding relations between the specified SOC and the voltage as a target corresponding relation, wherein the second corresponding relation is the corresponding relation between the SOC and the voltage of the battery obtained in the process of discharging the battery by adopting the specified current.
7. The device of claim 5, wherein the collecting unit is further configured to collect a current voltage of the battery;
the determining unit is configured to determine, according to the target correspondence, that the SOC corresponding to the current voltage of the battery in the target correspondence is the target SOC when the current voltage of the battery is lower than a preset voltage threshold.
8. The apparatus of claim 5, further comprising:
a second acquisition unit configured to acquire a current SOC of the battery;
the second obtaining unit is further configured to obtain a difference between the current SOC of the battery and the target SOC;
and the correction unit is used for replacing the current SOC of the battery with the target SOC when the difference is larger than a preset difference threshold.
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