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CN-121989753-A - Method and device for regulating and controlling state of charge of power battery and vehicle

CN121989753ACN 121989753 ACN121989753 ACN 121989753ACN-121989753-A

Abstract

The embodiment of the invention relates to the technical field of vehicles and discloses a method and a device for regulating and controlling the state of charge of a power battery and a vehicle, wherein the method comprises the steps of determining factor weights of at least one target influence factor based on driving conditions corresponding to the travel of the vehicle; the target influence factor is one of at least one calibration influence factor, the calibration influence factor is used for influencing at least one of the power performance of the vehicle, the fuel economy of the vehicle and the battery life of a power battery in the vehicle, the state of charge regulating coefficient of the power battery is determined based on the factor weight of the at least one target influence factor, and the state of charge of the power battery is regulated based on the state of charge regulating coefficient and the reference state of charge of the power battery. By applying the technical scheme of the invention, the state of charge of the power battery is regulated and controlled by at least one influencing factor, so that the service performance and the service life of the power battery can be obviously improved.

Inventors

  • YU FUYONG
  • HE HAO
  • CHENG XIUYING

Assignees

  • 深蓝汽车科技有限公司

Dates

Publication Date
20260508
Application Date
20260325

Claims (15)

  1. 1. The method for regulating and controlling the state of charge of the power battery is characterized by comprising the following steps of: Determining factor weights of at least one target influence factor based on driving conditions corresponding to a travel distance of a vehicle, wherein the target influence factor is one of at least one calibration influence factor, and the calibration influence factor is used for influencing at least one of the dynamic property of the vehicle, the fuel economy of the vehicle and the battery life of a power battery in the vehicle; determining a state of charge regulation factor of the power battery based on a factor weight of the at least one target impact factor; And regulating and controlling the state of charge of the power battery based on the state of charge regulating and controlling coefficient and the reference state of charge of the power battery.
  2. 2. The method of claim 1, wherein the driving conditions include urban conditions, mountain conditions, and high-speed conditions, and wherein the at least one target impact factor comprises a battery life impact factor that affects the battery life; The determining the factor weight of at least one target influence factor based on the driving working condition corresponding to the travel distance of the vehicle comprises the following steps: And determining the factor weight of the battery life influence factor based on the running condition and the running information of the power battery.
  3. 3. The method of claim 2, wherein determining the factor weight of the battery life impact factor based on the operating information of the power battery comprises: determining an initial factor weight of the battery life impact factor based on the operation information of the power battery; Determining a regulating direction of the state of charge of the power battery based on the driving working condition, wherein the regulating direction comprises regulating down, regulating up and maintaining stability; And correcting the initial influence factor based on the regulation direction to obtain the factor weight of the battery life influence factor.
  4. 4. A method of regulating a state of charge of a power battery according to claim 3, wherein said correcting said initial impact factor based on said regulating direction results in a factor weight of said battery life impact factor, comprising: Under the condition that the regulation and control direction is regulated down, correcting the initial factor weight based on a first correction coefficient to obtain the factor weight of the battery life influence factor, wherein the first correction coefficient correction is used for limiting the overdischarge of the power battery to damage the battery life; under the condition that the regulation and control direction is heightened, correcting the initial factor weight based on a second correction coefficient and a third correction coefficient to obtain the factor weight of the battery life influence factor, wherein the second correction coefficient is used for representing the life of the sacrificial battery to exchange power output; And under the condition that the regulation and control direction is stable, correcting the initial factor weight based on a fourth correction coefficient to obtain the factor weight of the battery life influence factor, wherein the fourth correction coefficient is used for strengthening the regulation and control influence of the battery life influence factor in the regulation and control direction.
  5. 5. The method for regulating and controlling the state of charge of a power battery according to claim 4, wherein the correcting the initial factor weight based on the second correction coefficient and the third correction coefficient to obtain the factor weight of the battery life influence factor includes: performing an index calculation on the initial impact factor with respect to a second correction coefficient, and determining a smaller value of an index calculation result and a third correction coefficient as a factor weight of the battery life impact factor; the second correction coefficient is a negative value with an absolute value smaller than 1, and the third correction coefficient is larger than 1.
  6. 6. The method for regulating and controlling the state of charge of a power battery according to claim 3, wherein the determining the regulating and controlling direction of the state of charge of the power battery based on the driving condition includes: Under the condition that the driving working condition is an urban working condition, the regulating and controlling direction is regulated down; Under the conditions that the driving working condition is a mountain road working condition and the travel journey climbs the slope, the regulating and controlling direction is heightening; And under the condition that the driving working condition is a high-speed working condition, the regulating and controlling direction is kept stable.
  7. 7. The method of claim 3, wherein the operating information comprises battery temperature and state of charge of the power battery when the power battery is historically parked, and a current maximum allowable power throughput per unit driving range of the power battery; The determining the initial factor weight of the battery life impact factor based on the operation information of the power battery comprises the following steps: determining a factor weight of the battery storage life impact factor based on battery temperature and state of charge when the power battery is historically parked; determining the ratio of the current maximum allowable power throughput of the unit driving mileage of the power battery to the maximum allowable power throughput of the unit driving mileage of the power battery when leaving the factory as the factor weight of the battery cycle life influence factor; an initial factor weight of the battery life impact factor is determined based on the factor weight of the battery storage life impact factor and the factor weight of the battery cycle life impact factor.
  8. 8. The method according to any one of claims 3 to 7, wherein, in the case where the driving condition is the urban condition or the mountain road condition, the at least one target influence factor further includes a course characteristic influence factor and/or a driving style influence factor; The determining the factor weight of at least one target influence factor based on the driving working condition corresponding to the travel distance of the vehicle further comprises: determining initial factor weights of travel route characteristic influence factors based on travel route characteristics corresponding to the travel route, wherein the travel route characteristics are used for representing congestion conditions and gradient change conditions; Correcting the initial factor weight of the travel route characteristic influence factor based on the driving working condition to obtain the factor weight of the travel route characteristic influence factor; and/or; Determining an initial factor weight of the driving style influencing factor based on a driving style of the vehicle; And correcting the initial factor weight of the driving style influence factor based on the driving working condition to obtain the factor weight of the driving style influence factor.
  9. 9. The method for regulating and controlling the state of charge of a power battery according to claim 8, wherein the correcting the initial factor weight of the travel route characteristic influence factor based on the driving condition to obtain the factor weight of the travel route characteristic influence factor includes: under the condition that the driving working condition is the urban working condition, correcting the initial factor weight of the travel route characteristic influence factor based on a fifth correction coefficient to obtain the factor weight of the travel route characteristic influence factor; Under the condition that the driving working condition is the mountain road working condition, correcting the initial factor weight of the travel route characteristic influence factor based on a sixth correction coefficient to obtain the factor weight of the travel route characteristic influence factor; Wherein the fifth correction coefficient and the sixth correction coefficient are used for strengthening the regulation and control influence of the stroke route characteristic influence factor in the regulation and control direction; and/or; correcting the initial factor weight of the driving style influence factor based on a seventh correction coefficient under the condition that the driving condition is the urban condition, so as to obtain the factor weight of the driving style influence factor; Correcting the initial factor weight of the driving style influence factor based on an eighth correction coefficient under the condition that the driving condition is the mountain road condition, so as to obtain the factor weight of the driving style influence factor; The seventh correction coefficient is used for weakening the regulation and control influence of the driving style influence factor in the regulation and control direction, and the eighth correction coefficient is used for strengthening the regulation and control influence of the driving style influence factor in the regulation and control direction.
  10. 10. The method for regulating and controlling the charge state of a power battery according to claim 9, wherein the at least one target influence factor further comprises an environmental temperature influence factor and/or a travel range remaining mileage influence factor when the driving condition is the urban condition; The determining the factor weight of at least one target influence factor based on the driving working condition corresponding to the travel distance of the vehicle further comprises: Determining an initial factor weight of the ambient temperature influence factor based on an ambient temperature of the vehicle; Correcting the initial factor weight of the environmental temperature influence factor based on a tenth correction coefficient to obtain the factor weight of the environmental temperature influence factor, wherein the tenth correction coefficient is determined based on the driving working condition, and the value of the tenth correction coefficient floats around 1; and/or determining initial factor weights of the trip remaining mileage influence factors based on the trip remaining mileage; And correcting the initial factor weight of the travel journey remaining mileage influence factor based on the tenth correction coefficient correction, and obtaining the factor weight of the travel journey remaining mileage influence factor.
  11. 11. The method for regulating and controlling the state of charge of a power battery according to claim 9, wherein in the case that the driving condition is a mountain road condition, the at least one target influence factor further comprises an altitude influence factor; The determining the factor weight of at least one target influence factor based on the driving working condition corresponding to the travel distance of the vehicle further comprises: Determining initial factor weights of the elevation influencing factors based on the elevation of the area where the travel journey is located; correcting the initial factor weight of the altitude impact factor based on a ninth correction coefficient to obtain the factor weight of the altitude impact factor; wherein the ninth correction factor is used to intensify the regulation influence of the altitude influence factor in the regulation direction.
  12. 12. The method for regulating and controlling the charge state of a power battery according to any one of claims 3 to 7, wherein the at least one target influence factor further comprises an ambient temperature influence factor and/or a trip remaining mileage influence factor in the case that the driving condition is the high-speed condition; The determining the factor weight of at least one target influence factor based on the driving working condition corresponding to the travel distance of the vehicle further comprises: Determining an initial factor weight of the ambient temperature influence factor based on an ambient temperature of the vehicle; correcting the initial factor weight of the environmental temperature influence factor based on an eleventh correction coefficient to obtain the factor weight of the environmental temperature influence factor; and/or determining initial factor weights of the trip remaining mileage influence factors based on the trip remaining mileage; Correcting the initial factor weight of the travel journey remaining mileage influence factor based on a twelfth correction coefficient to obtain the factor weight of the travel journey remaining mileage influence factor; The eleventh correction coefficient and the twelfth correction coefficient are both determined based on the driving working condition, the eleventh correction coefficient is used for weakening the regulation and control influence of the environmental temperature influence factor in the regulation and control direction, and the twelfth correction coefficient is used for weakening the regulation and control influence of the travel residual mileage influence factor in the regulation and control direction.
  13. 13. The method for regulating and controlling the state of charge of the power battery according to claim 2, wherein the regulating and controlling the state of charge of the power battery based on the state of charge regulating coefficient and the reference state of charge of the power battery includes: Determining a target state of charge regulation coefficient based on the state of charge regulation coefficient, wherein the target state of charge regulation coefficient is the closest value to the state of charge regulation coefficient in a preset coefficient interval when a first condition is met, the target state of charge regulation coefficient is the state of charge regulation coefficient when the first preset condition is not met, the first condition is that the driving condition is a high-speed working condition and the state of charge regulation coefficient is not in the preset coefficient interval, and the preset coefficient interval is used for limiting the regulation range of the state of charge of the power battery; Determining a target state of charge based on the target state of charge regulation coefficient and a state of charge allowed interval; And regulating and controlling the state of charge of the power battery by utilizing the target state of charge.
  14. 14. The power battery state of charge regulating and controlling device is characterized by comprising a first determining module, a second determining module and a regulating and controlling module; The first determining module is used for determining factor weight of at least one target influence factor based on a driving condition corresponding to a vehicle travel distance, wherein the target influence factor is one of at least one calibration influence factor, and the calibration influence factor is used for influencing at least one of the dynamic property of the vehicle, the fuel economy of the vehicle and the battery life of a power battery in the vehicle; The second determining module is used for determining a state of charge regulation coefficient of the power battery based on the factor weight of the at least one target influence factor; And the regulation and control module is used for regulating and controlling the state of charge of the power battery based on the state of charge regulation and control coefficient and the reference state of charge of the power battery.
  15. 15. A vehicle comprising a vehicle body, a power battery, and the power battery state-of-charge control device according to claim 14.

Description

Method and device for regulating and controlling state of charge of power battery and vehicle Technical Field The invention relates to the technical field of vehicles, in particular to a method and a device for regulating and controlling the state of charge of a power battery and a vehicle. Background While the conventional fuel oil vehicle cannot meet the regulation requirements and market demands due to continuous perfection of emission regulations and great improvement of fuel consumption standards, fuel oil is still a core energy source of the vehicle in an area with imperfect charging facilities and uniform electric charge and fuel charge, and HEV (electric vehicle) models without an externally inserted charging function can be accurately adapted to the use scenes. Meanwhile, the cost of a push energy type power battery (particularly represented by a lithium iron phosphate battery) of the new energy automobile is greatly reduced, the 1-2-degree electric power type power battery adopted by the traditional low-electric HEV still maintains high cost, and under the background that the two costs are converged, the high-electric HEV can carry the 4-8-degree electric energy type power battery, so that the electric quantity of the battery is doubled. Compared with the traditional 1-2-degree electric small electric quantity HEV, the large electric quantity HEV not only can remarkably optimize the power response and the driving silence of the whole vehicle, but also can effectively reduce the oil consumption of the actual working condition of a user, can realize the practical functions that the small electric quantity HEV such as a whistle mode, an in-situ long-time electric air conditioner and the like cannot support, enriches and upgrades the vehicle experience of the HEV vehicle type, and is hopeful to gradually replace the traditional small electric quantity HEV in the future. However, in the conventional low-electric-quantity HEV, because the electric quantity of the battery is limited, the SOC balance point of the power battery needs to be fixed at about 50%, the setting has obvious limitation, the SOC is too low to store sufficient energy for continuous high-power output of the vehicle, the energy recovery efficiency in the deceleration process of the vehicle can be reduced when the SOC is too high, and finally the fuel consumption of the whole vehicle is deteriorated, so that the service life of the power battery is influenced. Disclosure of Invention In view of the above-mentioned shortcomings of the prior art, the present application aims to provide a method and a device for regulating and controlling the state of charge of a power battery, and a vehicle, which aim to solve the technical problem of how to improve the service life of the power battery in the prior art. In a first aspect, an embodiment of the application provides a method for regulating and controlling a state of charge of a power battery, which comprises the steps of determining factor weights of at least one target influence factor based on driving conditions corresponding to a travel distance of a vehicle, wherein the target influence factor is one of at least one calibration influence factor, the calibration influence factor is used for influencing at least one of power performance of the vehicle, fuel economy of the vehicle and battery life of the power battery in the vehicle, determining a state of charge regulating coefficient of the power battery based on the factor weights of the at least one target influence factor, and regulating and controlling the state of charge of the power battery based on the state of charge regulating coefficient and a reference state of charge of the power battery. According to the technical means, the corresponding target influence factors and the factor weights thereof are dynamically matched according to the driving conditions, so that the state-of-charge regulation and control coefficient is more suitable for the current actual working condition requirement of the vehicle, and further, the accurate regulation and control of the state of charge of the power battery is realized. The mode can effectively prolong the service life of the power battery while guaranteeing the dynamic property and the fuel economy of the vehicle. In one possible embodiment, the driving conditions comprise urban conditions, mountain road conditions and high-speed conditions, the at least one target influence factor comprises a battery life influence factor influencing the service life of the battery, and the factor weight of the at least one target influence factor is determined based on the driving conditions corresponding to the travel distance of the vehicle, and the factor weight of the battery life influence factor is determined based on the driving conditions and the operation information of the power battery. According to the technical means, different driving conditions such as urban areas, mountain roads and high s