CN111781508B - Method and system for estimating SOC of hybrid vehicle-mounted battery - Google Patents
Method and system for estimating SOC of hybrid vehicle-mounted battery Download PDFInfo
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- CN111781508B CN111781508B CN202010553552.0A CN202010553552A CN111781508B CN 111781508 B CN111781508 B CN 111781508B CN 202010553552 A CN202010553552 A CN 202010553552A CN 111781508 B CN111781508 B CN 111781508B
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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]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3828—Arrangements for monitoring battery or accumulator variables, e.g. SoC using current integration
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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]
- G01R31/374—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] with means for correcting the measurement for temperature or ageing
Abstract
The invention discloses a hybrid vehicle-mounted battery SOC estimation method, which comprises the following steps: determining an SOC use interval of a whole vehicle use range; in the SOC use interval, calculating the SOC of the battery by using an ampere-hour integration method; calibrating an OCV-SOC curve of the battery, and selecting a calibration interval according to the slope of the OCV-SOC curve of the battery; when the charge and discharge throughput of the battery reaches a set threshold value, controlling the SOC use interval of the use range of the whole vehicle to be open, selecting a calibration point in the calibration interval, and determining the calibration range of the SOC; and calibrating the SOC through an SOC-OCV curve, and changing the SOC open interval into an SOC using interval after the SOC is calibrated. The method combines ampere-hour integration with voltage high-low end calibration to improve the estimation accuracy of the SOC of the power battery.
Description
Technical Field
The invention belongs to the field of electric vehicle power battery management, and particularly relates to a hybrid vehicle-mounted battery SOC estimation method and system.
Background
The electric automobile is a vehicle taking a motor as a power device and a battery as an energy storage device. The development of electric vehicles is a new strategic industry that is vigorously developed by various countries after energy crisis and financial crisis. Therefore, battery management is extremely important. The remaining battery capacity (SOC) of the battery pack is an important parameter of the battery management system, is the most important reference for planning a battery usage route, and is also the basis for power management and the like in battery management.
The SOC estimation is one of the most important parameters in the use process of the battery, and the high-precision SOC estimation not only can provide a good basis for the estimation of other parameters of the battery, but also can enable equipment users to have more accurate reference for the electric quantity of the battery.
For the power battery, algorithms for estimating the SOC by the BMS battery management system in the market are various, the pure electric SOC precision of the new energy automobile is about 5%, and the hybrid power type SOC precision is generally 15%. For a hybrid vehicle, during the service life of a vehicle-mounted battery, the SOC middle area range is usually selected as the whole vehicle for prolonging the service life of the vehicle-mounted battery, and the range is considered to be mainly distributed in a battery voltage platform area, so that the service condition of the battery is mild. However, for batteries, particularly for lithium iron phosphate batteries, the range of use here is mainly distributed in the voltage plateau region thereof, which makes estimation of SOC more difficult.
Disclosure of Invention
In view of the above technical problems, an object of the present invention is to provide a method and a system for estimating SOC of a hybrid vehicle-mounted battery, which can improve the estimation accuracy of the SOC of a power battery by combining ampere-hour integration and voltage high and low end calibration.
The technical scheme of the invention is as follows:
a hybrid vehicle-mounted battery SOC estimation method comprises the following steps:
s01: determining an SOC (system on chip) use interval of a whole vehicle use range;
s02: in the SOC use interval, calculating the SOC of the battery by using an ampere-hour integration method;
s03: calibrating an OCV-SOC curve of the battery, and selecting a calibration interval according to the slope of the OCV-SOC curve of the battery;
s04: when the charge and discharge throughput of the battery reaches a set threshold value, controlling the SOC use interval of the use range of the whole vehicle to be open, selecting a calibration point in the calibration interval, and determining the calibration range of the SOC;
s05: and calibrating the SOC through an SOC-OCV curve, and changing the SOC open interval into an SOC using interval after the SOC is calibrated.
In a preferred technical solution, the calibration interval in step S03 includes a first calibration interval and a second calibration interval.
In a preferred technical scheme, the SOC use interval is [40, 70].
In a preferred embodiment, the threshold value set in step S04 is 10C to 15C.
The invention also discloses a hybrid vehicle-mounted battery SOC estimation system, which comprises:
an SOC usage interval determination module: determining an SOC use interval of a whole vehicle use range;
an SOC calculation module: in the SOC use interval, calculating the SOC of the battery by using an ampere-hour integration method;
a calibration interval acquisition module: calibrating an OCV-SOC curve of the battery, and selecting a calibration interval according to the slope of the OCV-SOC curve of the battery;
an open control module: when the charge and discharge throughput of the battery reaches a set threshold value, controlling an SOC use interval of a use range of the whole vehicle to be open, selecting a calibration point in the calibration interval, and determining the calibration range of the SOC;
a calibration module: and calibrating the SOC through an SOC-OCV curve, and changing the SOC open interval into an SOC using interval after the SOC is calibrated.
In a preferred technical solution, the calibration interval in the calibration interval acquisition module includes a first calibration interval and a second calibration interval.
In a preferred technical scheme, the SOC use interval is [40, 70].
In a preferred technical scheme, the threshold value set in the open control module is 10C-15C.
Compared with the prior art, the invention has the beneficial effects that:
the method of the invention utilizes a mode of combining ampere-hour integration and high and low voltage calibration, calculates the SOC of the battery by using ampere-hour integration within the range of the SOC using range of the whole vehicle, opens the SOC using range to a region capable of being calibrated after the SOC using range is circularly used for a period of time, calibrates the SOC after reaching the calibration region, and adjusts the SOC using range to the original range after the calibration, thereby being capable of simply, conveniently and rapidly realizing the calibration and improving the SOC precision of the hybrid vehicle-mounted battery. And further, the service life of the battery, and the dynamic property and the safety performance of the electric automobile can be improved to a certain extent.
Drawings
The invention is further described with reference to the following figures and examples:
FIG. 1 is a flow chart of a hybrid vehicle battery SOC estimation method of the present invention;
fig. 2 is a schematic diagram of an OCV-SOC curve of a lithium iron phosphate positive electrode material cell;
FIG. 3 is a schematic diagram of a whole vehicle SOC usage interval and a calibration SOC interval.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It is to be understood that these descriptions are only illustrative and are not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
As shown in fig. 1, a method for estimating the SOC of a hybrid vehicle-mounted battery includes the steps of:
s01: determining an SOC (system on chip) use interval of a whole vehicle use range; for a battery OCV-SOC curve, the curve generally comprises an interval with larger slopes at two ends of the curve and a platform zone with basically unchanged slope in the middle, and the SOC use interval of the whole vehicle use range is the platform zone.
S02: calculating the SOC of the battery by using an ampere-hour integral method C =: [ integral ] Idt in an SOC use interval;
s03: calibrating an OCV-SOC curve of the battery, and selecting a calibration interval according to the slope of the OCV-SOC curve of the battery; determining intervals with larger curve slopes, which are generally positioned at two ends of the curve, wherein the calibration intervals comprise a first calibration interval (a low-end area) and a second calibration interval (a high-end area); the calibration interval can of course also be determined by the rate of change of the slope.
S04: when the charge and discharge throughput of the battery reaches a set threshold, the set threshold is generally 10C-15C, the SOC use interval of the use range of the whole vehicle is controlled to be open, a calibration point is selected in the calibration interval, and the calibration range of the SOC is determined; the range of calibration is as wide as possible, for example, preferably [0, 100].
S05: and calibrating the SOC through an SOC-OCV curve, and changing the SOC open interval into an SOC using interval after the SOC is calibrated. And when the next throughput limit value is reached, performing open calibration again.
The lithium iron phosphate battery is exemplified below, and is not limited to the battery made of the material, and is applicable to all power type hybrid vehicle batteries.
Example 1:
the algorithm for estimating the SOC of the hybrid power battery disclosed by the embodiment comprises the following steps of:
step one, the SOC whole vehicle use interval is a range, and the range is set as a whole vehicle common use range and is marked as [40, 70];
step two, as shown in fig. 2, for the OCV-SOC curve of the battery, the platform area is relatively flat and is generally difficult to calibrate through the platform, so a range area with a large slope at two ends of the curve, a high-end area [95, 100], a low-end area [0, 30] is selected, and the calibration area is set to be included in the range of the high-end area and the low-end area;
step three, the use intervals of the hybrid vehicle are generally distributed in a platform area, particularly lithium iron phosphate batteries are obvious, so that the SOC of the battery is calculated by using an ampere-hour integral C = Idt within the range of the SOC interval [40, 70] of the whole vehicle;
step four, through calibration, when the charge and discharge throughput of the battery reaches 10C, controlling the whole battery vehicle use SOC interval to be open, wherein the opening degree reaches a range [40, 100] capable of being calibrated;
and step five, when the SOC =100, calibrating the SOC of the battery, and changing the SOC open interval [40, 100] into the original vehicle use interval [40, 70] after the SOC is calibrated, as shown in fig. 3. And when the next throughput of 10C is reached, performing open calibration.
Example 2:
the algorithm for estimating the SOC of the hybrid battery disclosed by the embodiment comprises the following steps of:
step one, the SOC whole vehicle use interval is a range, and the range is set as a whole vehicle common use range and is marked as [40, 70];
step two, as for the OCV-SOC curve of the battery, the platform area is relatively flat, and the calibration is generally difficult to carry out through the platform, so that a range area with larger slopes at two ends of the curve, namely a high-end area [95, 100], a low-end area [0, 30] is selected, and the calibration area is arranged to be included in the ranges of the high-end area and the low-end area;
step three, the use intervals of the hybrid vehicle are generally distributed in a platform area, particularly lithium iron phosphate batteries are obvious, so that the SOC of the battery is calculated by using an ampere-hour integral C = Idt within the range of the SOC interval [40, 70] of the whole vehicle;
step four, through calibration, when the charge and discharge throughput of the battery reaches 15C, controlling the whole vehicle use SOC interval of the battery to be open, wherein the opening degree reaches a range [0, 70] capable of being calibrated;
and step five, when the SOC =15, calibrating the SOC of the battery, and changing the SOC open interval [0, 70] into the original vehicle use interval [40, 70] after calibration. And when the next throughput 15C is reached, performing open calibration again.
Example 3:
the algorithm for estimating the SOC of the hybrid battery disclosed by the embodiment comprises the following steps of:
step one, the SOC whole vehicle use interval is a range, and the range is set as a whole vehicle common use range and is marked as [40, 70];
step two, as for the OCV-SOC curve of the battery, the platform area is relatively flat, and the calibration is generally difficult to carry out through the platform, so that a range area with larger slopes at two ends of the curve, namely a high-end area [95, 100], a low-end area [0, 30] is selected, and the calibration area is arranged to be included in the ranges of the high-end area and the low-end area;
step three, the use intervals of the hybrid vehicle are generally distributed in a platform area, particularly lithium iron phosphate batteries are obvious, so that the SOC of the battery is calculated by using an ampere-hour integral C = Idt within the range of the SOC interval [40, 70] of the whole vehicle;
step four, through calibration, when the charge and discharge throughput of the battery reaches 15C, controlling the whole battery vehicle use SOC interval to be open, wherein the opening degree reaches a range [0, 100] capable of being calibrated;
and step five, when the SOC =15 or 100, calibrating the SOC of the battery, and changing the SOC open interval [0, 100] into the original vehicle use interval [40, 70] after calibration. And when the next throughput 15C is reached, performing open calibration again.
It should be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modifications, equivalents, improvements and the like which are made without departing from the spirit and scope of the present invention shall be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundary of the appended claims, or the equivalents of such scope and boundary.
Claims (8)
1. A method for estimating the SOC of a hybrid vehicle-mounted battery is characterized by comprising the following steps:
s01: determining an SOC use interval of a whole vehicle use range;
s02: in the SOC use interval, calculating the SOC of the battery by using an ampere-hour integration method;
s03: calibrating an OCV-SOC curve of the battery, and selecting a calibration interval according to the slope of the OCV-SOC curve of the battery;
s04: when the charge and discharge throughput of the battery reaches a set threshold value, controlling the SOC use interval of the use range of the whole vehicle to be open, selecting a calibration point in the calibration interval, and determining the calibration range of the SOC;
s05: and calibrating the SOC through an SOC-OCV curve, and changing the SOC open interval into an SOC using interval after the SOC is calibrated.
2. The method of estimating the SOC of the hybrid vehicle-mounted battery according to claim 1, wherein the calibration interval in the step S03 includes a first calibration interval and a second calibration interval.
3. The estimation method of hybrid vehicle-mounted battery SOC according to claim 1, characterized in that the SOC usage interval is [40, 70].
4. The method of estimating the SOC of the hybrid vehicle-mounted battery according to claim 1, wherein the threshold value is set to 10C-15C in step S04.
5. A hybrid vehicle-mounted battery SOC estimation system, characterized by comprising:
an SOC usage interval determination module: determining an SOC use interval of a whole vehicle use range;
an SOC calculation module: in the SOC use interval, calculating the SOC of the battery by using an ampere-hour integration method;
a calibration interval acquisition module: calibrating an OCV-SOC curve of the battery, and selecting a calibration interval according to the slope of the OCV-SOC curve of the battery;
an open control module: when the charge and discharge throughput of the battery reaches a set threshold value, controlling an SOC use interval of a use range of the whole vehicle to be open, selecting a calibration point in the calibration interval, and determining the calibration range of the SOC;
a calibration module: and calibrating the SOC through an SOC-OCV curve, and changing the SOC open interval into an SOC using interval after the SOC is calibrated.
6. The system according to claim 5, wherein the calibration interval in the calibration interval acquisition module includes a first calibration interval and a second calibration interval.
7. The hybrid vehicle-mounted battery SOC estimation system according to claim 5, wherein the SOC usage interval is [40, 70].
8. The system for estimating SOC of a hybrid vehicle-mounted battery according to claim 5, wherein the threshold value set in the open control module is 10C-15C.
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| CN202010553552.0A CN111781508B (en) | 2020-06-17 | 2020-06-17 | Method and system for estimating SOC of hybrid vehicle-mounted battery |
| PCT/CN2020/121184 WO2021253693A1 (en) | 2020-06-17 | 2020-10-15 | Method and system for estimating soc of hybrid power in-vehicle battery |
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