CN111180811A - Method and device for acquiring actual SOC of vehicle power storage battery pack - Google Patents
Method and device for acquiring actual SOC of vehicle power storage battery pack Download PDFInfo
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- CN111180811A CN111180811A CN202010010451.9A CN202010010451A CN111180811A CN 111180811 A CN111180811 A CN 111180811A CN 202010010451 A CN202010010451 A CN 202010010451A CN 111180811 A CN111180811 A CN 111180811A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The invention discloses a method for acquiring the actual SOC of a vehicle power storage battery pack, which comprises the steps of acquiring the SOC display value of the battery pack, and acquiring the maximum SOC of a single battery and the minimum SOC of the single battery; determining a capacity range in which a display value of the SOC of the battery pack is located; when the SOC display value of the battery pack is in a first capacity range, determining the actual value of the SOC of the battery pack according to the maximum SOC of the battery monomer; when the display value of the SOC of the battery pack is in a second capacity range, obtaining an actual value of the SOC of the battery pack according to the maximum SOC of the battery monomer, the minimum SOC of the battery monomer, the upper and lower values of the second capacity range and a preset mathematical model; and when the SOC display value of the battery pack is in a third capacity range, determining the actual value of the SOC of the battery pack according to the minimum SOC of the battery monomer. The invention uses the double variables of the maximum SOC of the battery monomer and the minimum SOC of the battery monomer to mathematically fit the functional relation between the actual SOC of the battery pack and the SOC of the battery monomer, is not limited by a charging and discharging mode, and ensures that the calculation of the actual SOC of the battery pack is more scientific, reasonable and accurate.
Description
Technical Field
The invention relates to the technical field of automobile batteries, in particular to a method and a device for acquiring the actual SOC of an automobile power storage battery pack.
Background
At present, a power storage battery pack (battery pack) carried by a new energy electric vehicle is composed of a plurality of battery modules, and each battery module is composed of a plurality of battery monomers. Therefore, it is very important to scientifically and reasonably define and use the SOC of the power storage battery pack in the electric automobile. The battery pack can be overcharged or overdischarged if the battery pack is improperly used, and even safety accidents occur; if the battery pack is used conservatively, the performance of the battery pack cannot be exerted to the maximum extent, and the dynamic property and the driving range of the whole vehicle are directly influenced. The current existing solutions mainly employ: in the discharging mode, the fact that the minimum SOC of the battery cell reaches the lower limit means that the battery can not be discharged any more, so that the actual SOC of the battery pack, namely pack SOC is MinCellSOC; in the charge mode, it is considered that the maximum SOC of the battery cell reaches the upper limit, which means that the battery cannot be charged any more, and therefore, PackSOC is adopted.
Wherein, packSOC: representing the SOC of the power battery pack; MinCellSOC: represents the minimum SOC of the battery cell; MaxCellSOC: represents the maximum SOC of the battery cell; CellSOC: representing the SOC of the battery cell.
The current scheme compares the one-sided and single-sided, and only uses the SOC (MaxCellSOC or MinCellSOC) of a certain battery monomer to represent the actual SOC of the battery pack according to the charging and discharging mode, namely the packSOC, and the relational expression is not very accurate and incomplete and is limited by the judgment and switching of the charging and discharging mode.
Disclosure of Invention
The invention aims to provide a method and a device for acquiring the SOC of a vehicle power storage battery pack, which solve the technical problems that the relation is inaccurate and incomplete, and the use safety and the driving range of the battery pack are influenced due to the fact that the SOC of the battery pack is represented by the SOC of one battery cell according to a charging and discharging mode.
In order to solve the technical problem, the invention provides a method for acquiring the actual SOC of a vehicle power storage battery pack, which comprises the following steps: acquiring a display value of the SOC of the battery pack, and simultaneously acquiring the maximum SOC of a single battery and the minimum SOC of the single battery; determining a capacity range in which a display value of the SOC of the battery pack is located according to a preset capacity range of the battery pack, wherein the preset capacity range comprises a first capacity range, a second capacity range and a third capacity range; when the display value of the SOC of the battery pack is in the first capacity range, determining the actual value of the SOC of the battery pack according to the maximum SOC of the battery monomer; when the display value of the SOC of the battery pack is in the second capacity range, obtaining an actual value of the SOC of the battery pack according to the maximum SOC of the single battery, the minimum SOC of the single battery, the upper and lower values of the second capacity range and a preset mathematical model; and when the display value of the SOC of the battery pack is in the third capacity range, determining the actual value of the SOC of the battery pack according to the minimum SOC of the single battery.
Further, the first capacity range is a range in which the charging power of the battery pack is gradually reduced to zero, the second capacity range is a range in which the battery pack is in safe use, and the third capacity range is a range in which the discharging power of the battery pack is gradually reduced to zero.
Further, the determining a capacity range in which a display value of the SOC of the battery pack is located according to a preset capacity range of the battery pack includes: the method comprises the steps that region division is carried out on an SOC window of the battery pack according to a first capacity, a second capacity, a third capacity and a fourth capacity, and a first capacity range, a second capacity range and a third capacity range are determined; the first capacity range is the first capacity to the second capacity, the second capacity range is the second capacity to the third capacity, and the third capacity range is the third capacity to the fourth capacity; the first capacity is the highest allowable SOC of the battery pack; the second capacity is an upper limit SOC when the battery pack can provide peak charging power; the third capacity is a lower limit SOC when the battery pack can provide peak discharge power; and the fourth capacity is the lowest allowable SOC of the battery pack.
Further, the preset mathematical model is a mathematical model of an actual value of the SOC of the battery pack, the maximum SOC of the battery cell, the minimum SOC of the battery cell, and upper and lower values of the second capacity range, which are obtained based on mathematical fitting between upper and lower limit values of an SOC window of the battery pack for the maximum SOC of the battery cell and the minimum SOC of the battery cell.
Further, the preset mathematical model is as follows: the actual value of the battery pack SOC is equal to the lower limit value of the second capacity range + (minimum SOC of battery cell-lower limit value of the second capacity range)/(upper limit value of the second capacity range-lower limit value of the second capacity range)/[ (upper limit value of the second capacity range-lower limit value of the second capacity range) - (maximum SOC of battery cell-minimum SOC of battery cell) ].
Correspondingly, the invention also provides a device for acquiring the actual SOC of the vehicle power storage battery pack, which comprises: the acquisition module is used for acquiring the display value of the SOC of the battery pack and acquiring the maximum SOC of the single battery and the minimum SOC of the single battery at the same time; the device comprises a capacity range determining module, a capacity range determining module and a capacity range determining module, wherein the capacity range determining module is used for determining a capacity range where a display value of the SOC of the battery pack is located according to a preset capacity range of the battery pack, and the preset capacity range comprises a first capacity range, a second capacity range and a third capacity range; the first determination module is used for determining the actual value of the SOC of the battery pack according to the maximum SOC of the single battery when the display value of the SOC of the battery pack is in the first capacity range; the second determination module is used for obtaining the actual value of the SOC of the battery pack according to the maximum SOC of the single battery, the minimum SOC of the single battery, the upper and lower values of the second capacity range and a preset mathematical model when the display value of the SOC of the battery pack is in the second capacity range; and the third determination module is used for determining the actual value of the SOC of the battery pack according to the minimum SOC of the single battery when the display value of the SOC of the battery pack is in the third capacity range.
Further, the first capacity range is a range in which the charging power of the battery pack is gradually reduced to zero, the second capacity range is a range in which the battery pack is in safe use, and the third capacity range is a range in which the discharging power of the battery pack is gradually reduced to zero.
Further, the capacity range determination module is further configured to: carrying out region division on an SOC window of the battery pack according to the first capacity, the second capacity, the third capacity and the fourth capacity to determine a first capacity range, a second capacity range and a third capacity range; the first capacity range is the first capacity to the second capacity, the second capacity range is the second capacity to the third capacity, and the third capacity range is the third capacity to the fourth capacity; the first capacity is the highest allowable SOC of the battery pack; the second capacity is an upper limit SOC when the battery pack can provide peak charging power; the third capacity is a lower limit SOC when the battery pack can provide peak discharge power; and the fourth capacity is the lowest allowable SOC of the battery pack.
Further, the preset mathematical model is a mathematical model of an actual value of the SOC of the battery pack, the maximum SOC of the battery cell, the minimum SOC of the battery cell, and upper and lower values of the second capacity range, which are obtained based on mathematical fitting between upper and lower limit values of a SOC window of the battery pack for the maximum SOC of the battery cell and the minimum SOC of the battery cell.
Further, the preset mathematical model is as follows: the actual value of the battery pack SOC is equal to the lower limit value of the second capacity range + (minimum SOC of battery cell-lower limit value of the second capacity range)/(upper limit value of the second capacity range-lower limit value of the second capacity range)/[ (upper limit value of the second capacity range-lower limit value of the second capacity range) - (maximum SOC of battery cell-minimum SOC of battery cell) ].
The implementation of the invention has the following beneficial effects:
the invention carries out system definition and management on the SOC window from the aspects of the battery characteristics and the safe use of the battery pack; and dividing different capacity ranges according to the SOC upper and lower limit window values, and completely and systematically quantitatively defining and mathematically fitting a functional relation between the actual SOC of the battery pack and the SOC of the battery monomer by using the double variables of the maximum SOC of the battery monomer and the minimum SOC of the battery monomer in the different capacity ranges. The method for obtaining the actual SOC of the battery pack is not dependent on or limited by a charging and discharging mode any more, and the actual SOC of the battery pack is more scientific, reasonable and accurate.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed for the description of the embodiments or the prior art 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 without creative efforts.
FIG. 1 is a schematic diagram of a battery pack SOC window according to the present invention;
fig. 2 is a diagram showing a relationship between an actual SOC of a battery pack and a battery cell in the present invention;
FIG. 3 is a flow chart of a method for obtaining an actual SOC of a vehicle power battery pack according to the present invention;
fig. 4 is a schematic diagram of an apparatus for acquiring an actual SOC of a vehicle power storage battery pack according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.
The details are described below by way of examples.
The remaining capacity of the battery pack is displayed on a display window of the battery pack SOC of the electric vehicle, but the display value only displays the range on a window interface, cannot be used as an accurate value, and only displays the approximate range of the SOC. In the use of the current new energy electric automobile, the following main methods are adopted: in the discharging mode, the minimum SOC of the battery monomer is considered to reach the lower limit mark, and the battery can not be discharged continuously; in the charging mode, the maximum SOC of the battery unit is considered to reach the upper limit, and the battery cannot be charged any more. However, the SOC of the battery pack is expressed by using only the SOC of one battery cell according to the charge/discharge mode, the relation is not very accurate and incomplete, and is limited by the judgment and switching of the charge/discharge mode, and the actual value of the SOC of the battery pack is not accurate, so that the performance of the battery pack cannot be exerted to the maximum within the safe use range of the battery pack, and the dynamic performance and the driving range of the whole vehicle are affected.
Example 1
As shown in fig. 3, a method for obtaining an actual SOC of a vehicle power battery pack includes:
s100, acquiring a display value of the SOC of the battery pack, and simultaneously acquiring the maximum SOC of the single battery and the minimum SOC of the single battery.
As shown in fig. 1, a schematic diagram of a battery pack SOC window, a vehicle control system obtains a display value of a battery pack SOC and displays the display value on the SOC window, but as known to those skilled in the art, the display value displayed on the SOC window has uncertainty and can only be used to obtain the range thereof, and cannot be used as a basis for reasonably exerting the performance of the battery pack. Therefore, the display value of the battery pack SOC is acquired in this step to be used to determine the capacity range in which the display value of the battery pack SOC is located in step S200.
S200, determining a capacity range where a display value of the SOC of the battery pack is located according to a preset capacity range of the battery pack, wherein the preset capacity range comprises a first capacity range, a second capacity range and a third capacity range.
In this step, the first capacity range is a range in which the charging power of the battery pack is gradually reduced to a zero point, the second capacity range is a safe use range in which the battery pack is located, the safe use range is determined by detecting the battery pack for multiple times, and the power of the battery pack is stable in the safe use range. The third capacity range is a range in which the discharge power of the battery pack is gradually reduced to zero.
Specifically, S200 determines a capacity range in which a display value of the SOC of the battery pack is located according to the preset capacity range of the battery pack, including:
the method comprises the steps that the SOC window of the battery pack is divided into regions according to a first capacity, a second capacity, a third capacity and a fourth capacity, and a first capacity range, a second capacity range and a third capacity range are determined; the first capacity range is from the first capacity to the second capacity, the second capacity range is from the second capacity to the third capacity, and the third capacity range is from the third capacity to the fourth capacity.
The first capacity is the maximum allowable SOC of the battery pack, and at this point and above, it indicates that the charging power capability is limited to 0. The second capacity is an upper limit SOC at which the battery pack can supply the peak charging power, and above this point, represents a point (zero point) at which the charging power is gradually reduced to the charging power capacity corresponding to the first capacity. The third capacity is a lower limit SOC when the battery pack can provide peak discharge power, and below the lower limit SOC, the discharge power is gradually reduced to a point (zero point) of discharge power capacity corresponding to the fourth capacity; the fourth capacity is the lowest allowable SOC of the battery pack, and at this point and below, it means that the discharge power capability is limited to 0.
In the practical application process, the first capacity, the second capacity, the third capacity and the fourth capacity are determined according to the characteristics of the battery pack. In the display shown in fig. 1, the values of the first capacity to the fourth capacity are sequentially reduced, for example, the maximum allowable SOC of the battery pack, that is, the first capacity is 80%, the second capacity is 70%, the third capacity is 30%, and the fourth capacity is 20%, that is, the determined first capacity range is 80% -70%, in which the SOC of the battery pack reaches the upper use limit and needs to be limited for use, and the charging power of the battery pack needs to be gradually reduced to zero. And the determined second capacity range is 70% -30%, and the SOC of the battery pack is in an unlimited safe use range in the process. And the determined third capacity range is 30% -20%, the SOC of the battery pack in the range reaches the lower limit and needs to be limited, and the discharging power of the battery pack needs to be gradually reduced to zero.
In practical applications, the first capacity and the second capacity overlap, and the third capacity and the fourth capacity overlap. For the battery pack with good performance, the first capacity and the second capacity are overlapped and are both 100%, the third capacity and the fourth capacity are overlapped and are both 0%, that is, the maximum allowable SOC of the battery pack is overlapped and is 100% with the SOC of the battery pack capable of providing the peak charging power, and the SOC of the battery pack capable of providing the peak discharging power is overlapped and is 0 with the minimum allowable SOC of the battery pack.
S300, when the display value of the SOC of the battery pack is in a first capacity range, determining the actual value of the SOC of the battery pack according to the maximum SOC of the battery monomer;
when the display value of the SOC of the battery pack is in a second capacity range, obtaining an actual value of the SOC of the battery pack according to the maximum SOC of the single battery, the minimum SOC of the single battery, the upper and lower values of the second capacity range and a preset mathematical model;
and when the display value of the SOC of the battery pack is in the third capacity range, determining the actual value of the SOC of the battery pack according to the minimum SOC of the single battery.
Referring to fig. 2, a relationship diagram between the actual SOC of the battery pack and the battery cell, when the display value of the SOC of the battery pack is in a first capacity range, the SOC of the battery pack in the range reaches an upper use limit and needs to be limited, the charging power of the battery pack needs to be gradually reduced to a zero point, in order to ensure that no over-discharge use or safety requirement occurs, the actual value of the SOC of the battery pack is determined according to the maximum SOC of the battery cell, and specifically, the actual value of the SOC of the battery pack needs to be infinitely close to the maximum SOC of the battery cell, that is, the maximum SOC of the battery cell is taken as the actual value of.
When the displayed value of the battery pack SOC is in the second capacity range, the battery pack SOC is in an unlimited safe use range in the process. In order to fully exert the performance of the battery pack, a scientific method is adopted to express the actual SOC value of the battery pack by mathematically fitting two variables of the maximum SOC of the battery cell and the minimum SOC of the battery cell in an upper limit interval and a lower limit interval of an SOC window.
The method comprises the steps of obtaining a mathematical model of an actual value of the SOC of the battery pack, the maximum SOC of the battery cell, the minimum SOC of the battery cell and upper and lower values of a second capacity range on the basis of mathematical fitting between the maximum SOC of the battery cell and the minimum SOC of the battery cell between upper and lower limit values of an SOC window of the battery pack, wherein the mathematical model is used as a preset mathematical model, and obtaining the actual value of the SOC of the battery pack according to the maximum SOC of the battery cell, the minimum SOC of the battery cell, the upper and lower values of the second capacity range and the preset mathematical model.
Referring to fig. 2, in this embodiment, a mathematical model of the actual value of the SOC of the battery pack, the maximum SOC of the battery cell, the minimum SOC of the battery cell, and the upper and lower values of the second capacity range is obtained by fitting the maximum SOC of the battery cell and the minimum SOC of the battery cell between the upper and lower limit values of the SOC window of the battery pack based on a straight line, and is used as a preset mathematical model.
The obtained preset mathematical model is: the actual value of the battery pack SOC is equal to the lower limit value of the second capacity range + (minimum SOC of battery cell-lower limit value of the second capacity range)/(upper limit value of the second capacity range-lower limit value of the second capacity range)/[ (upper limit value of the second capacity range-lower limit value of the second capacity range) - (maximum SOC of battery cell-minimum SOC of battery cell) ].
Due to the third capacity, which is the lower limit of the second capacity range, and the second capacity, which is the upper limit of the second capacity range, the predetermined mathematical model may be written as: the actual value of the battery pack SOC is third capacity + (minimum SOC of cell to third capacity) × (second capacity to third capacity)/[ (second capacity to third capacity) - (maximum SOC of cell to minimum SOC of cell) ].
In addition, the maximum allowable SOC of the battery pack overlaps and is 100% with the SOC of the battery pack when the peak charging power is available, and the SOC of the battery pack when the peak discharging power is available overlaps and is 0% with the minimum allowable SOC of the battery pack. That is, when the first capacity and the second capacity are both 1, and the third capacity and the fourth capacity are both 0, the preset mathematical model is simplified as follows: the actual value of the battery pack SOC is the minimum SOC of the battery cell/(1-maximum SOC of the battery cell + minimum SOC of the battery cell).
When the display value of the SOC of the battery pack is in a third capacity range, the SOC of the battery pack in the range reaches a lower limit and needs to be limited for use, the discharging power of the battery pack needs to be gradually reduced to a zero point, in order to ensure that the safety requirement of over-discharging use cannot occur, the actual value of the SOC of the battery pack is determined according to the minimum SOC of the battery monomer, and the actual value of the SOC of the battery pack needs to be infinitely close to the minimum SOC of the battery monomer, namely the minimum SOC of the battery monomer is used as the actual value of the SOC of the battery pack.
The invention carries out system definition and management on the SOC window from the aspects of the battery characteristics and the safe use of the battery pack; and dividing different capacity ranges according to the SOC upper and lower limit window values, and completely and systematically quantitatively defining and mathematically fitting a functional relation between the actual SOC of the battery pack and the SOC of the battery monomer by using the double variables of the maximum SOC of the battery monomer and the minimum SOC of the battery monomer in the different capacity ranges. The method for obtaining the actual SOC of the battery pack is not dependent on or limited by a charging and discharging mode any more, and the actual SOC of the battery pack is more scientific, reasonable and accurate.
Example 2
An apparatus for acquiring an actual SOC of a vehicle power battery pack, referring to fig. 4, includes:
the acquisition module is used for acquiring the display value of the SOC of the battery pack and acquiring the maximum SOC of the single battery and the minimum SOC of the single battery at the same time.
As shown in fig. 1, a schematic diagram of a battery pack SOC window, a vehicle control system obtains a display value of a battery pack SOC and displays the display value on the SOC window, but as known to those skilled in the art, the display value displayed on the SOC window has uncertainty and can only be used to obtain the range thereof, and cannot be used as a basis for reasonably exerting the performance of the battery pack. Therefore, the display value of the battery pack SOC is acquired in this step to be used to determine the capacity range in which the display value of the battery pack SOC is located in step S200.
And the capacity range determining module is used for determining the capacity range where the display value of the SOC of the battery pack is located according to the preset capacity range of the battery pack, and the preset capacity range comprises a first capacity range, a second capacity range and a third capacity range.
The first capacity range is a range in which the charging power of the battery pack is gradually reduced to zero, the second capacity range is a safe use range in which the battery pack is located, the safe use range is determined by detecting the battery pack for multiple times, and the power of the battery pack is stable in the safe use range. The third capacity range is a range in which the discharge power of the battery pack is gradually reduced to zero.
Specifically, the capacity range determining module is further configured to perform area division on the SOC window of the battery pack according to the first capacity, the second capacity, the third capacity and the fourth capacity, and determine a first capacity range, a second capacity range and a third capacity range; the first capacity range is from the first capacity to the second capacity, the second capacity range is from the second capacity to the third capacity, and the third capacity range is from the third capacity to the fourth capacity.
The first capacity is the maximum allowable SOC of the battery pack, and at this point and above, it indicates that the charging power capability is limited to 0. The second capacity is an upper limit SOC at which the battery pack can supply the peak charging power, and above this point, represents a point (zero point) at which the charging power is gradually reduced to the charging power capacity corresponding to the first capacity. The third capacity is a lower limit SOC when the battery pack can provide peak discharge power, and below the lower limit SOC, the discharge power is gradually reduced to a point (zero point) of discharge power capacity corresponding to the fourth capacity; the fourth capacity is the lowest allowable SOC of the battery pack, and at this point and below, it means that the discharge power capability is limited to 0.
In the practical application process, the first capacity, the second capacity, the third capacity and the fourth capacity are determined according to the characteristics of the battery pack. In the display shown in fig. 1, the values of the first capacity to the fourth capacity are sequentially reduced, for example, the maximum allowable SOC of the battery pack, that is, the first capacity is 80%, the second capacity is 70%, the third capacity is 30%, and the fourth capacity is 20%, that is, the determined first capacity range is 80% -70%, in which the SOC of the battery pack reaches the upper use limit and needs to be limited for use, and the charging power of the battery pack needs to be gradually reduced to zero. And the determined second capacity range is 70% -30%, and the SOC of the battery pack is in an unlimited safe use range in the process. And the determined third capacity range is 30% -20%, the SOC of the battery pack in the range reaches the lower limit and needs to be limited, and the discharging power of the battery pack needs to be gradually reduced to zero.
In practical applications, the first capacity and the second capacity overlap, and the third capacity and the fourth capacity overlap. For the battery pack with good performance, the first capacity and the second capacity are overlapped and are both 100%, the third capacity and the fourth capacity are overlapped and are both 0%, that is, the maximum allowable SOC of the battery pack is overlapped and is 100% with the SOC of the battery pack capable of providing the peak charging power, and the SOC of the battery pack capable of providing the peak discharging power is overlapped and is 0 with the minimum allowable SOC of the battery pack.
The first determination module is used for determining the actual value of the SOC of the battery pack according to the maximum SOC of the battery monomer when the display value of the SOC of the battery pack is in a first capacity range;
the second determining module is used for obtaining the actual value of the SOC of the battery pack according to the maximum SOC of the single battery, the minimum SOC of the single battery, the upper and lower values of the second capacity range and a preset mathematical model when the display value of the SOC of the battery pack is in the second capacity range;
and the third determination module is used for determining the actual value of the SOC of the battery pack according to the minimum SOC of the battery cells when the display value of the SOC of the battery pack is in a third capacity range.
Referring to fig. 2, a relationship diagram between the actual SOC of the battery pack and the battery cell, when the display value of the SOC of the battery pack is in a first capacity range, the SOC of the battery pack in the range reaches an upper use limit and needs to be limited, the charging power of the battery pack needs to be gradually reduced to a zero point, in order to ensure that no over-discharge use or safety requirement occurs, the actual value of the SOC of the battery pack is determined according to the maximum SOC of the battery cell, and specifically, the actual value of the SOC of the battery pack needs to be infinitely close to the maximum SOC of the battery cell, that is, the maximum SOC of the battery cell is taken as the actual value of.
When the displayed value of the battery pack SOC is in the second capacity range, the battery pack SOC is in an unlimited safe use range in the process. In order to fully exert the performance of the battery pack, a scientific method is adopted to express the actual SOC value of the battery pack by mathematically fitting two variables of the maximum SOC of the battery cell and the minimum SOC of the battery cell in an upper limit interval and a lower limit interval of an SOC window.
The method comprises the steps of obtaining a mathematical model of an actual value of the SOC of the battery pack, the maximum SOC of the battery cell, the minimum SOC of the battery cell and upper and lower values of a second capacity range on the basis of mathematical fitting between the maximum SOC of the battery cell and the minimum SOC of the battery cell between upper and lower limit values of an SOC window of the battery pack, wherein the mathematical model is used as a preset mathematical model, and obtaining the actual value of the SOC of the battery pack according to the maximum SOC of the battery cell, the minimum SOC of the battery cell, the upper and lower values of the second capacity range and the preset mathematical model.
Referring to fig. 2, in this embodiment, a mathematical model of the actual value of the SOC of the battery pack, the maximum SOC of the battery cell, the minimum SOC of the battery cell, and the upper and lower values of the second capacity range is obtained by fitting the maximum SOC of the battery cell and the minimum SOC of the battery cell between the upper and lower limit values of the SOC window of the battery pack based on a straight line, and is used as a preset mathematical model.
The obtained preset mathematical model is: the actual value of the battery pack SOC is equal to the lower limit value of the second capacity range + (minimum SOC of battery cell-lower limit value of the second capacity range)/(upper limit value of the second capacity range-lower limit value of the second capacity range)/[ (upper limit value of the second capacity range-lower limit value of the second capacity range) - (maximum SOC of battery cell-minimum SOC of battery cell) ].
Due to the third capacity, which is the lower limit of the second capacity range, and the second capacity, which is the upper limit of the second capacity range, the predetermined mathematical model may be written as: the actual value of the battery pack SOC is third capacity + (minimum SOC of cell to third capacity) × (second capacity to third capacity)/[ (second capacity to third capacity) - (maximum SOC of cell to minimum SOC of cell) ].
In addition, the maximum allowable SOC of the battery pack overlaps and is 100% with the SOC of the battery pack when the peak charging power is available, and the SOC of the battery pack when the peak discharging power is available overlaps and is 0% with the minimum allowable SOC of the battery pack. That is, when the first capacity and the second capacity are both 1, and the third capacity and the fourth capacity are both 0, the preset mathematical model is simplified as follows: the actual value of the battery pack SOC is the minimum SOC of the battery cell/(1-maximum SOC of the battery cell + minimum SOC of the battery cell).
When the display value of the SOC of the battery pack is in a third capacity range, the SOC of the battery pack in the range reaches a lower limit and needs to be limited for use, the discharging power of the battery pack needs to be gradually reduced to a zero point, in order to ensure that the safety requirement of over-discharging use cannot occur, the actual value of the SOC of the battery pack is determined according to the minimum SOC of the battery monomer, and the actual value of the SOC of the battery pack needs to be infinitely close to the minimum SOC of the battery monomer, namely the minimum SOC of the battery monomer is used as the actual value of the SOC of the battery pack.
The invention carries out system definition and management on the SOC window from the aspects of the battery characteristics and the safe use of the battery pack; and dividing different capacity ranges according to the SOC upper and lower limit window values, and completely and systematically quantitatively defining and mathematically fitting a functional relation between the actual SOC of the battery pack and the SOC of the battery monomer by using the double variables of the maximum SOC of the battery monomer and the minimum SOC of the battery monomer in the different capacity ranges. The method for obtaining the actual SOC of the battery pack is not dependent on or limited by a charging and discharging mode any more, and the actual SOC of the battery pack is more scientific, reasonable and accurate.
It should be noted that, in the present specification, each embodiment is described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. The antiskid control device provided by the embodiment of the invention has the same implementation principle and technical effects as those of the method embodiment, and for the sake of brief description, the corresponding contents in the method embodiment can be referred to where the embodiment of the device is not mentioned.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways. The apparatus embodiments described above are merely illustrative, and for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based devices that perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, and are used for illustrating the technical solutions of the present invention, but not for limiting the same, and the scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: those skilled in the art can still modify or easily conceive of the technical solutions described in the foregoing embodiments or make equivalent substitutions for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the above claims.
Claims (10)
1. A method for acquiring the actual SOC of a vehicle power storage battery pack is characterized by comprising the following steps:
acquiring a display value of the SOC of the battery pack, and simultaneously acquiring the maximum SOC of a single battery and the minimum SOC of the single battery;
determining a capacity range where a display value of the SOC of the battery pack is located according to a preset capacity range of the battery pack, wherein the preset capacity range comprises a first capacity range, a second capacity range and a third capacity range;
when the display value of the SOC of the battery pack is in the first capacity range, determining the actual value of the SOC of the battery pack according to the maximum SOC of the single battery;
when the display value of the SOC of the battery pack is in the second capacity range, obtaining an actual value of the SOC of the battery pack according to the maximum SOC of the single battery, the minimum SOC of the single battery, the upper and lower values of the second capacity range and a preset mathematical model;
and when the display value of the SOC of the battery pack is in the third capacity range, determining the actual value of the SOC of the battery pack according to the minimum SOC of the single battery.
2. The method for acquiring the actual SOC of the vehicle power storage battery pack according to claim 1, characterized in that: the first capacity range is a range in which the charging power of the battery pack is gradually reduced to zero, the second capacity range is a range in which the battery pack is in safe use, and the third capacity range is a range in which the discharging power of the battery pack is gradually reduced to zero.
3. The method for acquiring the actual SOC of the vehicle power storage battery pack according to claim 1, characterized in that: the method for determining the capacity range of the display value of the SOC of the battery pack according to the preset capacity range of the battery pack comprises the following steps:
carrying out region division on an SOC window of the battery pack according to the first capacity, the second capacity, the third capacity and the fourth capacity to determine a first capacity range, a second capacity range and a third capacity range; the first capacity range is the first capacity to the second capacity, the second capacity range is the second capacity to the third capacity, and the third capacity range is the third capacity to the fourth capacity;
the first capacity is the highest allowable SOC of the battery pack; the second capacity is an upper limit SOC when the battery pack can provide peak charging power; the third capacity is a lower limit SOC when the battery pack can provide peak discharge power; and the fourth capacity is the lowest allowable SOC of the battery pack.
4. The method for acquiring the actual SOC of the vehicle power storage battery pack according to claim 1, characterized in that:
the preset mathematical model is a mathematical model of the actual value of the SOC of the battery pack, the maximum SOC of the battery monomer, the minimum SOC of the battery monomer and the upper and lower values of the second capacity range, which are obtained based on mathematical fitting between the maximum SOC of the battery monomer and the minimum SOC of the battery monomer and the upper and lower values of the SOC window of the battery pack.
5. The method for acquiring the actual SOC of the vehicle power storage battery pack according to claim 4, characterized in that: the preset mathematical model is as follows:
the actual value of the battery pack SOC is equal to the lower limit value of the second capacity range + (minimum SOC of battery cell-lower limit value of the second capacity range)/(upper limit value of the second capacity range-lower limit value of the second capacity range)/[ (upper limit value of the second capacity range-lower limit value of the second capacity range) - (maximum SOC of battery cell-minimum SOC of battery cell) ].
6. An apparatus for acquiring an actual SOC of a vehicle power storage battery pack, comprising: the method comprises the following steps:
the acquisition module is used for: acquiring a display value of the SOC of the battery pack, and simultaneously acquiring the maximum SOC of a single battery and the minimum SOC of the single battery;
the capacity range determination module is to: determining a capacity range where a display value of the SOC of the battery pack is located according to a preset capacity range of the battery pack, wherein the preset capacity range comprises a first capacity range, a second capacity range and a third capacity range;
the first determination module is used for determining the actual value of the SOC of the battery pack according to the maximum SOC of the single battery when the display value of the SOC of the battery pack is in the first capacity range;
the second determination module is used for obtaining the actual value of the SOC of the battery pack according to the maximum SOC of the single battery, the minimum SOC of the single battery, the upper and lower values of the second capacity range and a preset mathematical model when the display value of the SOC of the battery pack is in the second capacity range;
and the third determination module is used for determining the actual value of the SOC of the battery pack according to the minimum SOC of the single battery when the display value of the SOC of the battery pack is in the third capacity range.
7. The apparatus for acquiring actual SOC of a vehicle power storage battery pack according to claim 6, characterized in that: the first capacity range is a range in which the charging power of the battery pack is gradually reduced to zero, the second capacity range is a range in which the battery pack is in safe use, and the third capacity range is a range in which the discharging power of the battery pack is gradually reduced to zero.
8. The apparatus for acquiring actual SOC of a vehicle power storage battery pack according to claim 6, characterized in that: the capacity range determination module is further configured to:
carrying out region division on an SOC window of the battery pack according to the first capacity, the second capacity, the third capacity and the fourth capacity to determine a first capacity range, a second capacity range and a third capacity range; the first capacity range is the first capacity to the second capacity, the second capacity range is the second capacity to the third capacity, and the third capacity range is the third capacity to the fourth capacity;
the first capacity is the highest allowable SOC of the battery pack; the second capacity is an upper limit SOC when the battery pack can provide peak charging power; the third capacity is a lower limit SOC when the battery pack can provide peak discharge power; and the fourth capacity is the lowest allowable SOC of the battery pack.
9. The apparatus for acquiring actual SOC of a vehicle power storage battery pack according to claim 6, characterized in that: the preset mathematical model is a mathematical model of an actual value of the SOC of the battery pack, the maximum SOC of the battery monomer, the minimum SOC of the battery monomer and upper and lower values of the second capacity range, which are obtained based on mathematical fitting between the maximum SOC of the battery monomer and the minimum SOC of the battery monomer and upper and lower limits of a battery pack SOC window.
10. The apparatus for acquiring an actual SOC of a vehicle power storage battery pack according to claim 9, characterized in that: the preset mathematical model is as follows:
the actual value of the battery pack SOC is equal to the lower limit value of the second capacity range + (minimum SOC of battery cell-lower limit value of the second capacity range)/(upper limit value of the second capacity range-lower limit value of the second capacity range)/[ (upper limit value of the second capacity range-lower limit value of the second capacity range) - (maximum SOC of battery cell-minimum SOC of battery cell) ].
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109342959A (en) * | 2018-12-11 | 2019-02-15 | 桑顿新能源科技有限公司 | A kind of SOC estimation method for solving battery difference and using capacity requirement |
| CN117293979A (en) * | 2023-11-27 | 2023-12-26 | 广汽埃安新能源汽车股份有限公司 | Battery equalization control method, storage medium and electronic device |
| WO2024187644A1 (en) * | 2023-03-10 | 2024-09-19 | 欣旺达动力科技股份有限公司 | Method and apparatus for adjusting soc of hybrid battery, and device and medium |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101065876A (en) * | 2004-11-11 | 2007-10-31 | 株式会社Lg化学 | Method and system for cell equalization using state of charge |
| CN103688181A (en) * | 2011-05-20 | 2014-03-26 | 雷诺股份公司 | A method of estimating the state of charge of an electric battery |
| EP2991852A2 (en) * | 2013-04-30 | 2016-03-09 | Nuvera Fuel Cells, Inc. | Battery state-of-charge aggregation method |
| CN107091992A (en) * | 2017-05-15 | 2017-08-25 | 安徽锐能科技有限公司 | Battery pack state-of-charge SOC methods of estimation and estimating system |
| CN107733007A (en) * | 2017-09-28 | 2018-02-23 | 河南理工大学 | A kind of direct equalizing circuit of battery pack Bi-objective and equalization methods |
| CN108983108A (en) * | 2018-08-10 | 2018-12-11 | 山东大学 | A kind of power battery pack peak power estimation method |
| CN109633473A (en) * | 2019-01-23 | 2019-04-16 | 刘平 | A kind of distributed battery group state-of-charge algorithm for estimating |
| CN109655753A (en) * | 2018-07-16 | 2019-04-19 | 杭州高特电子设备股份有限公司 | A kind of evaluation method of battery pack SOC |
-
2020
- 2020-01-06 CN CN202010010451.9A patent/CN111180811B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101065876A (en) * | 2004-11-11 | 2007-10-31 | 株式会社Lg化学 | Method and system for cell equalization using state of charge |
| CN103688181A (en) * | 2011-05-20 | 2014-03-26 | 雷诺股份公司 | A method of estimating the state of charge of an electric battery |
| EP2991852A2 (en) * | 2013-04-30 | 2016-03-09 | Nuvera Fuel Cells, Inc. | Battery state-of-charge aggregation method |
| CN107091992A (en) * | 2017-05-15 | 2017-08-25 | 安徽锐能科技有限公司 | Battery pack state-of-charge SOC methods of estimation and estimating system |
| CN107733007A (en) * | 2017-09-28 | 2018-02-23 | 河南理工大学 | A kind of direct equalizing circuit of battery pack Bi-objective and equalization methods |
| CN109655753A (en) * | 2018-07-16 | 2019-04-19 | 杭州高特电子设备股份有限公司 | A kind of evaluation method of battery pack SOC |
| CN108983108A (en) * | 2018-08-10 | 2018-12-11 | 山东大学 | A kind of power battery pack peak power estimation method |
| CN109633473A (en) * | 2019-01-23 | 2019-04-16 | 刘平 | A kind of distributed battery group state-of-charge algorithm for estimating |
Non-Patent Citations (1)
| Title |
|---|
| 张利等: "基于剩余容量在线估算的电池组主动均衡研究", 《电子测量与仪器学报》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109342959A (en) * | 2018-12-11 | 2019-02-15 | 桑顿新能源科技有限公司 | A kind of SOC estimation method for solving battery difference and using capacity requirement |
| WO2024187644A1 (en) * | 2023-03-10 | 2024-09-19 | 欣旺达动力科技股份有限公司 | Method and apparatus for adjusting soc of hybrid battery, and device and medium |
| CN117293979A (en) * | 2023-11-27 | 2023-12-26 | 广汽埃安新能源汽车股份有限公司 | Battery equalization control method, storage medium and electronic device |
| CN117293979B (en) * | 2023-11-27 | 2024-03-22 | 广汽埃安新能源汽车股份有限公司 | Battery equalization control method, storage medium and electronic device |
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