CN111284480B - SOC correction method and correction equipment for vehicle power battery - Google Patents
SOC correction method and correction equipment for vehicle power battery Download PDFInfo
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- CN111284480B CN111284480B CN202010163045.6A CN202010163045A CN111284480B CN 111284480 B CN111284480 B CN 111284480B CN 202010163045 A CN202010163045 A CN 202010163045A CN 111284480 B CN111284480 B CN 111284480B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W20/00—Control systems specially adapted for hybrid vehicles
- B60W20/10—Controlling the power contribution of each of the prime movers to meet required power demand
- B60W20/13—Controlling the power contribution of each of the prime movers to meet required power demand in order to stay within battery power input or output limits; in order to prevent overcharging or battery depletion
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/24—Conjoint control of vehicle sub-units of different type or different function including control of energy storage means
- B60W10/26—Conjoint control of vehicle sub-units of different type or different function including control of energy storage means for electrical energy, e.g. batteries or capacitors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2510/00—Input parameters relating to a particular sub-units
- B60W2510/24—Energy storage means
- B60W2510/242—Energy storage means for electrical energy
- B60W2510/244—Charge state
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2710/00—Output or target parameters relating to a particular sub-units
- B60W2710/24—Energy storage means
- B60W2710/242—Energy storage means for electrical energy
- B60W2710/244—Charge state
Abstract
The invention provides a SOC correction method and correction equipment for a vehicle power battery, wherein the SOC correction method comprises the following steps: acquiring an SOC-OCV curve of the vehicle power battery; determining the running range of the SOC correction strategy according to the SOC range of the slope zone in the obtained SOC-OCV curve; determining an SOC operation balance interval of the vehicle power battery under the actual vehicle working condition; the SOC correction strategy of the vehicle power battery is linked with the control strategy of the vehicle controller, a mapping function of the SOC real value and the SOC display value of the vehicle power battery is established, and when the SOC display value is in the SOC running balance interval, the corresponding SOC real value is in the SOC range of the slope zone in the SOC-OCV curve, so that SOC correction is facilitated. The SOC correction method disclosed by the invention aims at the SOC-OCV curve characteristics of the vehicle power battery, combines the control strategy of a vehicle controller, performs mapping function processing on the SOC, can frequently correct the error accumulated by the SOC of the vehicle power battery, and is beneficial to improving the SOC precision of the vehicle power battery.
Description
Technical Field
The invention relates to the technical field of vehicle power batteries of hybrid vehicles, in particular to a method and equipment for correcting the SOC of a vehicle power battery.
Background
At present, in the development process of new energy automobiles, the development of hybrid electric vehicles as transition products from traditional fuel oil automobiles to pure electric automobiles has a great strategic significance. Among them, the lithium iron phosphate battery is called as an ideal power source for electric vehicles because of its long life, good safety performance and low cost.
However, the behavior of the power battery as a key energy storage element of the hybrid electric vehicle during use is highly nonlinear, so that accurate estimation of the SOC (state of charge) is more difficult. The common SOC algorithm is an algorithm based on ampere-hour integration and is matched with various correction models to estimate the SOC. However, due to the collection period and the error of the current sensor, the SOC error is accumulated continuously along with the accumulation of time, so that the SOC accuracy is worse and worse.
For a hybrid vehicle model, the battery operates in a platform region of an SOC-OCV curve most of the time, and the change of an OCV (open circuit voltage) in the platform region is very small, so that it is difficult to correct the SOC-OCV, and therefore, the SOC estimation error accumulation caused by ampere-hour integral calculation becomes larger and larger. Further, the power battery is rarely fully charged and cannot be fully charged due to problems such as usage habits of users and convenience of charging. Therefore, only by accurately estimating the SOC of the battery, the SOC of the battery can be maintained in a reasonable target range, the damage to the battery due to the overcharge or the overdischarge of the battery is avoided, the service life of the battery is shortened, and the running cost of the hybrid vehicle is improved.
Disclosure of Invention
The invention aims to provide a method for correcting the SOC of a vehicle power battery, which can frequently correct the error accumulated by the SOC of the vehicle power battery, improve the SOC precision of the vehicle power battery and is beneficial to prolonging the service life of the vehicle power battery.
Particularly, the invention provides a SOC correction method of a vehicle power battery, which comprises the following steps:
acquiring an SOC-OCV curve of the vehicle power battery;
determining the running range of an SOC correction strategy according to the SOC range of the slope zone in the obtained SOC-OCV curve;
linking the SOC correction strategy of the vehicle power battery with a control strategy of a vehicle controller, and determining an SOC operation balance interval of the vehicle power battery under the actual vehicle working condition;
and establishing a mapping function of the SOC real value and the SOC display value of the vehicle power battery, and ensuring that the corresponding SOC real value is in the SOC range of a slope zone in the SOC-OCV curve when the SOC display value is in the SOC running balance interval so as to facilitate SOC correction.
Further, the power battery for the vehicle is a lithium iron phosphate battery.
Further, the vehicle control unit controls the SOC value of the vehicle power battery to be 40% -70%.
Further, the mode of establishing the mapping function of the SOC real value and the SOC display value of the vehicle power battery is single-segment mapping.
Further, the mode of establishing the mapping function of the real SOC value and the display SOC value of the vehicle power battery is segmented mapping.
Further, the SOC range of the slope region in the SOC-OCV curve is 55% to 65%.
Further, the SOC ranges of the SOC operation balance interval are 40% -55% and 65% -70%.
The invention also provides a device for correcting the SOC of the vehicle power battery, which comprises a processor and a memory, wherein the memory is internally stored with a computer program, and the computer program is used for realizing the SOC correction method of the vehicle power battery according to the embodiment when being executed by the processor.
According to the SOC correction method of the vehicle power battery, disclosed by the invention, aiming at the SOC-OCV curve characteristic of the vehicle power battery, the SOC is subjected to mapping function processing by combining the control strategy of the vehicle controller of the hybrid vehicle, so that the error accumulated by the SOC of the vehicle power battery can be frequently corrected, the SOC precision of the vehicle power battery is favorably improved, the service life of the vehicle power battery is prolonged, and the running cost of the hybrid vehicle is reduced.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
fig. 1 is a flowchart of a SOC correction method of a power battery for a vehicle according to an embodiment of the present invention;
fig. 2 is a SOC-OCV graph of the vehicle power battery.
Detailed Description
Referring to fig. 1, the SOC correction method for a vehicle power battery according to the embodiment of the present invention includes the following steps:
s1, acquiring an SOC-OCV curve of the vehicle power battery;
s2, determining the operation range of the SOC correction strategy according to the SOC range of the slope zone in the obtained SOC-OCV curve;
s3, linking the SOC correction strategy of the vehicle power battery with the control strategy of the vehicle controller, and determining the SOC operation balance interval of the vehicle power battery under the actual vehicle working condition;
s4, establishing a mapping function of the SOC real value and the SOC display value of the vehicle power battery, and ensuring that the corresponding SOC real value is in the SOC range of a slope zone in an SOC-OCV curve when the SOC display value is in an SOC running balance zone so as to facilitate SOC correction.
Specifically, referring to fig. 1, in the SOC correction method for a vehicle power battery according to the present invention, first, an SOC-OCV curve of the vehicle power battery may be obtained, that is, the SOC-OCV curve of the vehicle power battery may be obtained through a current sensor, a voltage sensor, and the like.
The SOC-OCV curve of the vehicle power battery has two platform areas, the invention adopts the lithium iron phosphate power battery as the vehicle power battery, and the lithium iron phosphate battery has the advantages of long service life, good safety performance, low cost and the like, and is an ideal power source of the electric vehicle. As shown in fig. 2, a curve a in fig. 2 is an OCV curve of a lithium iron phosphate battery in a charging state, a curve b is an OCV curve of a lithium iron phosphate battery in a discharging state, the OCV of the lithium iron phosphate battery has two platform areas in an entire SOC interval, and table lookup of the OCV (open circuit voltage) on the SOC in the platform areas is not feasible.
It should be noted that the SOC-OCV curves of lithium iron phosphate batteries with different positive and negative ratios are different, and the platform areas are not completely the same. The SOC operation balance interval refers to the operation of the SOC of the battery controlled by the vehicle control unit in a certain range. The SOC range is generally 40% -70%, the SOC just covers the platform area of the battery, and when the vehicle is in a standing state, the SOC often stays in the platform area of the battery, so that the SOC cannot be corrected.
Then, according to the SOC range of the slope zone in the obtained SOC-OCV curve, the operation range of the SOC correction strategy is determined. As shown in fig. 2, the SOC range of the slope region in the SOC-OCV curve is 55% to 65%, and when the vehicle power battery operates in the SOC range of the slope region in the SOC-OCV curve, the OCV voltage of the battery after long-time standing can well correspond to the SOC value, so that the operation range of the SOC correction strategy can be determined according to the SOC range of the slope region in the obtained SOC-OCV curve.
And then, determining the SOC operation balance interval of the vehicle power battery under the actual vehicle working condition. That is to say, in the running process of the vehicle power battery, the vehicle controller can control the use of the battery according to the SOC value of the vehicle power battery, and generally controls the SOC of the vehicle power battery to be between 40% and 70% to ensure that the battery does not have the phenomenon of overcharge or overdischarge.
And finally, linking the SOC operation balance interval of the power battery under the actual vehicle working condition with the slope area of the SOC-OCV curve of the power battery. And establishing a mapping function of the SOC real value and the SOC display value of the vehicle power battery, and ensuring that the corresponding SOC real value is in a slope zone in an SOC-OCV curve when the SOC display value is in an SOC running balance zone so as to facilitate SOC correction. That is, the manner of establishing the mapping function of the real SOC value and the SOC display value of the vehicle power battery may be single-segment mapping or segmented mapping. By establishing a mapping function of the SOC real value and the SOC display value of the vehicle power battery, the time that the whole vehicle stays in a slope zone (linear zone) in an SOC-OCV curve is increased, and therefore the opportunity of triggering the SOC-OCV correction strategy is increased. In the SOC correction method of the vehicle power battery, the application of the mapping function can be adaptively changed according to different control strategies of the vehicle controller, and the algorithm is more flexible.
It should be noted that after a Battery Management System (BMS) is powered on, a remaining battery capacity (SOC) of a battery is uploaded to an instrument, and in consideration of a service life and a failure rate of a power battery, a SOC real value of the battery is generally in a certain correspondence with an SOC display value (i.e., an reported SOC value), which is referred to as a mapping function for short. The mapping function and the SOC real value can be divided into a plurality of sections to correspond to each other, and can also correspond to one section, and the mapping coefficient can be any number. After the BMS is powered on, a mapping function is called, and the mapped SOC value, namely the SOC display value, is displayed on the instrument. The SOC of the vehicle power battery is generally in a use range of 15% -95%, the SOC display value and the SOC real value are generally mapped, and the use range of 80% of the SOC of the vehicle power battery is stretched to 100% for display, namely the SOC display value stretches the interval to 0-100%, 15% corresponds to 0, and 95% corresponds to 100%.
Referring to fig. 1 and fig. 2, taking the SOC balance range of the entire vehicle under the actual working condition as 48% -53%, the mapping relationship between the original SOC real value and the SOC display value of the vehicle power battery refers to table one.
Table one:
the SOC true value of the battery in the SOC balance interval is between 53% and 58% (see a bold character part in the table 1), and the battery is in a platform area of the vehicle power battery, so that the OCV correction of the battery cannot be carried out. After mapping adjustment is carried out by the SOC correction method of the vehicle power battery, the mapping relation of real SOC-display SOC is shown in a table II, the real SOC value of the vehicle power battery is between 60% and 65% (see a bold character part in the table II) and is in a slope zone (linear zone) in an SOC-OCV curve, OCV can be well corrected, and the SOC accuracy of the vehicle power battery is improved.
Table two:
in summary, the SOC correction method for the vehicle power battery according to the present invention is used for correcting the SOC-OCV curve characteristic of the vehicle power battery by combining the control strategy of the vehicle control unit of the hybrid vehicle and performing mapping function processing on the SOC, so that the error accumulated by the SOC of the vehicle power battery can be frequently corrected, which is beneficial to improving the SOC accuracy of the vehicle power battery, prolonging the service life of the vehicle power battery, reducing the operation cost of the hybrid vehicle, and reducing the accuracy requirement on the hardware of the battery management system. In addition, the SOC correction method of the vehicle power battery does not need to change the formula of the battery core, reduces the requirement of a large number of test parameters required by battery core modeling, and saves time and cost.
The invention also provides a device for correcting the SOC of the vehicle power battery, which comprises a processor and a memory, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the SOC correction device is used for realizing the SOC correction method of the vehicle power battery according to the embodiment. The SOC correction device of the vehicle power battery can correct the error accumulated by the SOC of the vehicle power battery by adopting the SOC correction method in the embodiment, thereby being beneficial to improving the SOC precision of the vehicle power battery, prolonging the service life of the vehicle power battery, reducing the running cost of the hybrid vehicle and simultaneously reducing the precision requirement on the hardware of a battery management system.
Other structures and operation principles of the SOC correcting apparatus for a vehicle power battery according to an embodiment of the present invention will be understood and easily implemented by those skilled in the art, and thus will not be described in detail.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
Claims (8)
1. A SOC correction method for a vehicle power battery is characterized by comprising the following steps:
acquiring an SOC-OCV curve of the vehicle power battery;
determining the running range of an SOC correction strategy according to the SOC range of the slope zone in the obtained SOC-OCV curve;
linking the SOC correction strategy of the vehicle power battery with a control strategy of a vehicle controller, and determining an SOC operation balance interval of the vehicle power battery under the actual vehicle working condition;
and establishing a mapping function of the SOC real value and the SOC display value of the vehicle power battery, and ensuring that the corresponding SOC real value is in the SOC range of a slope zone in the SOC-OCV curve when the SOC display value is in the SOC running balance interval so as to facilitate SOC correction.
2. The method for correcting the SOC of the vehicular power battery according to claim 1, wherein the vehicular power battery is a lithium iron phosphate battery.
3. The SOC correction method for the vehicle power battery according to claim 1, characterized in that the vehicle control unit controls the SOC value of the vehicle power battery at 40% -70%.
4. The SOC correction method for vehicle power battery according to claim 1, characterized in that the way of establishing the mapping function of the real SOC value and the display SOC value of the vehicle power battery is a single-stage mapping.
5. The SOC correction method for vehicle power battery according to claim 1, characterized in that the mapping function of the real SOC value and the display SOC value of the vehicle power battery is established in a segmented mapping manner.
6. The SOC correction method for a vehicle power battery according to claim 2, characterized in that the SOC range of the slope region in the SOC-OCV curve is 55% to 65%.
7. The SOC correction method for a vehicle power battery according to claim 2, wherein the SOC range of the SOC operation balance interval is 40% -55% or 65% -70%.
8. An SOC correction apparatus for a vehicular power battery, characterized by comprising a processor and a memory, the memory having stored therein a computer program for implementing the SOC correction method for a vehicular power battery according to any one of claims 1 to 7 when the computer program is executed by the processor.
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| CN112114258B (en) * | 2020-09-03 | 2023-11-03 | 北京现代汽车有限公司 | Method and device for estimating available capacity of power battery, medium and equipment |
| CN113665433B (en) * | 2021-08-27 | 2023-04-07 | 三一汽车起重机械有限公司 | Method and device for correcting state of charge parameters and operating machine |
| CN117269801B (en) * | 2023-11-22 | 2024-03-01 | 潍柴新能源动力科技有限公司 | Battery charge state determining method and device and electronic equipment |
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| CN103616646B (en) * | 2013-12-02 | 2016-04-06 | 惠州市亿能电子有限公司 | A kind of method utilizing OCV-SOC curve amendment SOC |
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Effective date of registration: 20211129 Address after: Room 612, building 1, 1760 Jiangling Road, Binjiang District, Hangzhou City, Zhejiang Province Patentee after: ZHEJIANG GEELY NEW ENERGY COMMERCIAL VEHICLE GROUP Co.,Ltd. Patentee after: GEELY SICHUAN COMMERCIAL VEHICLE Co.,Ltd. Patentee after: Zhejiang Geely new energy Commercial Vehicle Development Co.,Ltd. Patentee after: Zhejiang remote commercial vehicle R & D Co.,Ltd. Patentee after: ZHEJIANG GEELY HOLDING GROUP Co.,Ltd. Address before: Room 612, building 1, 1760 Jiangling Road, Binjiang District, Hangzhou City, Zhejiang Province Patentee before: ZHEJIANG GEELY NEW ENERGY COMMERCIAL VEHICLE GROUP Co.,Ltd. Patentee before: GEELY SICHUAN COMMERCIAL VEHICLE Co.,Ltd. Patentee before: Zhejiang Geely new energy Commercial Vehicle Development Co.,Ltd. Patentee before: ZHEJIANG GEELY HOLDING GROUP Co.,Ltd. |
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Address after: 310051 No. 1760, Jiangling Road, Hangzhou, Zhejiang, Binjiang District Patentee after: Zhejiang Geely Remote New Energy Commercial Vehicle Group Co.,Ltd. Patentee after: GEELY SICHUAN COMMERCIAL VEHICLE Co.,Ltd. Patentee after: Zhejiang Geely new energy Commercial Vehicle Development Co.,Ltd. Patentee after: Zhejiang remote commercial vehicle R & D Co.,Ltd. Patentee after: ZHEJIANG GEELY HOLDING GROUP Co.,Ltd. Address before: Room 612, building 1, 1760 Jiangling Road, Binjiang District, Hangzhou City, Zhejiang Province Patentee before: ZHEJIANG GEELY NEW ENERGY COMMERCIAL VEHICLE GROUP Co.,Ltd. Patentee before: GEELY SICHUAN COMMERCIAL VEHICLE Co.,Ltd. Patentee before: Zhejiang Geely new energy Commercial Vehicle Development Co.,Ltd. Patentee before: Zhejiang remote commercial vehicle R & D Co.,Ltd. Patentee before: ZHEJIANG GEELY HOLDING GROUP Co.,Ltd. |
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Effective date of registration: 20230731 Address after: 310051 No. 1760, Jiangling Road, Hangzhou, Zhejiang, Binjiang District Patentee after: Zhejiang Geely Remote New Energy Commercial Vehicle Group Co.,Ltd. Patentee after: GEELY SICHUAN COMMERCIAL VEHICLE Co.,Ltd. Patentee after: Zhejiang remote commercial vehicle R & D Co.,Ltd. Patentee after: ZHEJIANG GEELY HOLDING GROUP Co.,Ltd. Address before: 310051 No. 1760, Jiangling Road, Hangzhou, Zhejiang, Binjiang District Patentee before: Zhejiang Geely Remote New Energy Commercial Vehicle Group Co.,Ltd. Patentee before: GEELY SICHUAN COMMERCIAL VEHICLE Co.,Ltd. Patentee before: Zhejiang Geely new energy Commercial Vehicle Development Co.,Ltd. Patentee before: Zhejiang remote commercial vehicle R & D Co.,Ltd. Patentee before: ZHEJIANG GEELY HOLDING GROUP Co.,Ltd. |