Method for adjusting battery discharge curve, battery management system and vehicle

Abstract

The invention relates to a method for adjusting a discharge curve of a battery. The method comprises the following steps: acquiring a speed change curve of a vehicle and environment temperature forecast information of each key position of a navigation route on the way at the estimated arrival time of the vehicle based on navigation information of the vehicle; predicting a change curve of the ambient temperature along the navigation route about the estimated arrival time of the vehicle on the basis of the acquired ambient temperature forecast information; determining a perceived temperature curve of the battery based on the predicted change curve and the speed change curve; a discharge profile of the battery is adjusted based at least on the determined perceived temperature profile. The invention relates to a battery management system, a vehicle and a computer program product. According to the application, the adjusted battery discharge curve is closer to the actual discharge process of the battery when the vehicle runs along the navigation route, the operation performance of the battery is evaluated more accurately, and a foundation is laid for more accurately predicting the endurance mileage of the vehicle and adjusting the operation strategy of the battery.

Description

Technical Field

[0001] This application relates to the field of vehicle batteries, and more particularly to a method for adjusting a battery discharge curve, a battery management system, a vehicle including the battery management system according to this application, and a computer program product. Background Technology

[0002] In the actual use of electric vehicles, battery range is always a key concern for users. Current technology typically uses battery discharge curves to predict battery range. However, battery discharge curves are easily affected by factors such as ambient temperature and driving habits. Especially when the vehicle enters low-temperature environments such as high-altitude mountains, the battery range will be significantly reduced, leading to lower accuracy in the predicted range and exacerbating users' range anxiety.

[0003] Therefore, improving the accuracy of battery range prediction has become a key technical challenge that needs to be addressed. Summary of the Invention

[0004] The purpose of this application is to provide a method for adjusting a battery discharge curve, a battery management system, a vehicle including the battery management system according to this application, and a computer program product, to at least partially solve the problems in the prior art.

[0005] According to a first aspect of this application, a method for adjusting a battery discharge curve is provided, the method comprising:

[0006] - Based on the vehicle's navigation information, obtain the vehicle's speed change curve and the ambient temperature forecast information of each key location along the navigation route at the vehicle's estimated arrival time.

[0007] - Based on the obtained ambient temperature forecast information, predict the change curve of ambient temperature along the navigation route with respect to the estimated arrival time of the vehicle;

[0008] - Determine the battery's sensing temperature curve based on the predicted change curve and the speed change curve; and

[0009] - Adjust the battery's discharge curve based at least on the determined sensing temperature curve.

[0010] The core concept of this application is to predict the ambient temperature change curve along the entire navigation route using ambient temperature forecast information at key locations along the route at the estimated arrival time of the vehicle. Then, using the predicted ambient temperature change curve and the vehicle speed change curve, the battery's perceived temperature curve is determined. This fully considers the impact of changes in ambient temperature and battery discharge current on the battery's internal temperature during vehicle operation. Based on the determined perceived temperature curve, the battery's discharge curve is adjusted to more closely resemble the actual discharge process of the battery as the vehicle travels along the navigation route. This allows for a more accurate assessment of battery performance and lays the foundation for more accurate prediction of vehicle range and adjustment of battery operating strategies.

[0011] According to an optional embodiment of this application, the predicted ambient temperature information of other locations along the navigation route at the estimated arrival time of the vehicle can be obtained by interpolation based on the ambient temperature forecast information of each key location along the route at the estimated arrival time of the vehicle. The ambient temperature forecast information of each key location along the route and the predicted ambient temperature information of the other locations along the route are then used to determine the change curve of the ambient temperature along the navigation route with respect to the estimated arrival time of the vehicle.

[0012] According to another optional embodiment of this application, the method may further include:

[0013] - Estimate the power consumption information of the vehicle air conditioner based on the power parameters and the predicted change curve, and adjust the battery discharge curve based at least on the estimated power consumption information.

[0014] According to another optional embodiment of this application, the vehicle speed change curve can be obtained based on the vehicle's navigation information, and the estimated arrival time of the vehicle at each key location along the navigation route can be calculated. The ambient temperature forecast information of each key location along the navigation route at the estimated arrival time of the vehicle can be obtained from the backend server.

[0015] According to another optional embodiment of this application, the unadjusted discharge curve of the battery can be determined by the following test: the state parameters of the battery are detected at various ambient temperatures, and the change curve of the battery's operating voltage with respect to discharge time or discharge capacity is determined based on the detected state parameters, wherein the state parameters of the battery include, for example, the battery's operating voltage, discharge current and / or discharge capacity.

[0016] According to another optional embodiment of this application, the method may further include:

[0017] - Adjust the battery discharge curve based at least on driving operation parameters collected during the driver's driving, wherein the driving operation parameters include, for example, acceleration operation parameters and / or braking operation parameters.

[0018] According to another optional embodiment of this application, the method may further include:

[0019] The vehicle's driving range can be estimated based at least on the battery's adjusted discharge profile, and / or the battery's operating strategy can be adjusted.

[0020] According to a second aspect of this application, a battery management system is provided, which may include the following components:

[0021] - An information acquisition unit, configured to acquire, based on the vehicle's navigation information, the vehicle's speed change curve and ambient temperature forecast information at key locations along the navigation route at the vehicle's estimated arrival time; and

[0022] - A control unit for performing the method according to this application.

[0023] According to a third aspect of this application, a vehicle is provided that may include a battery management system according to this application.

[0024] According to a fourth aspect of this application, a computer program product, such as a computer-readable program carrier, is provided, comprising or storing computer program instructions that, when executed by a processor, at least assist in implementing the steps of the method described in this application. Attached Figure Description

[0025] The principles, features, and advantages of this application can be better understood by describing it in more detail below with reference to the accompanying drawings. The drawings show:

[0026] Figure 1 A flowchart illustrating a method for adjusting a battery discharge profile according to an exemplary embodiment of this application is shown.

[0027] Figure 2 A flowchart illustrating a method for adjusting a battery discharge profile according to another exemplary embodiment of this application is shown.

[0028] Figure 3 A flowchart illustrating a method for adjusting a battery discharge profile according to another exemplary embodiment of this application is shown.

[0029] Figure 4 A flowchart illustrating a method for adjusting a battery discharge profile according to another exemplary embodiment of this application is shown.

[0030] Figure 5 A schematic diagram of a vehicle for adjusting a battery discharge curve according to an exemplary embodiment of this application is shown. Detailed Implementation

[0031] To make the technical problems to be solved, the technical solutions, and the beneficial technical effects of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and several exemplary embodiments. It should be understood that the specific embodiments described herein are only for explaining this application and are not intended to limit the scope of protection of this application.

[0032] Figure 1 A flowchart illustrating a method for adjusting a battery discharge profile according to an exemplary embodiment of this application is shown. The following exemplary embodiments describe the method according to this application in more detail.

[0033] like Figure 1 As shown, the method may include steps S1 to S4. In step S1, the vehicle's speed change curve and the ambient temperature forecast information of each key location along the navigation route at the estimated arrival time of the vehicle can be obtained based on the vehicle's navigation information. In the current embodiment of this application, the information acquisition unit 11 of the battery management system 10 of vehicle 1 can obtain the navigation information of vehicle 1 from the in-vehicle navigation system. The navigation information may include the navigation route from the vehicle's current position to the destination position, the current road condition information of the navigation route, and the vehicle speed history information collected during the vehicle's driving process, etc. Therefore, the speed change curve of vehicle 1 can be obtained based on the vehicle's navigation information, and the estimated arrival time of the vehicle at each key location along the navigation route can be calculated based on the vehicle's speed change curve and the current road condition information of the navigation route. The information acquisition unit 11 can send a request to the backend server and obtain the ambient temperature forecast information of each key location along the navigation route at the estimated arrival time of the vehicle. The key locations along the route are mountain passes, valleys at high altitudes, and other locations with large fluctuations in ambient temperature. Meteorological monitoring stations are usually set up at the key locations along the route, and the ambient temperature forecast information at the key locations along the route is usually quite accurate.

[0034] In step S2, the change curve of ambient temperature along the navigation route with respect to the estimated arrival time of the vehicle can be predicted based on the acquired ambient temperature forecast information. Here, the predicted ambient temperature information of other locations along the navigation route at the estimated arrival time of the vehicle can be obtained, for example, by interpolation, based on the ambient temperature forecast information of each key location along the route at the estimated arrival time of the vehicle. The change curve of ambient temperature along the navigation route with respect to the estimated arrival time of the vehicle is then determined using the ambient temperature forecast information of each key location along the route and the predicted ambient temperature information of the other locations along the route. These other locations along the route are locations other than the key locations along the route from the vehicle's current location to the destination location. The number of other locations along the route is significantly larger than the number of key locations along the route, thus allowing for a relatively accurate prediction of the ambient temperature change along the entire navigation route with limited meteorological data.

[0035] In step S3, the perceived temperature curve of the battery can be determined based on the predicted change curve and the speed change curve. In this application, the perceived temperature of the battery represents the predicted temperature of the battery body under operating conditions, estimated by the battery management system 10 through the fusion of multi-dimensional parameters. It reflects the cumulative influence of various factors on the battery body temperature, thus closely approximating the actual internal temperature of the battery body under real operating conditions. Here, the fused multi-dimensional parameters may include the change curve of the ambient temperature along the navigation route with respect to the estimated arrival time of the vehicle—representing the change process of the ambient temperature where the battery is located during driving—and the vehicle speed change curve—which is related to the change process of the battery's discharge current during vehicle driving. For example, high-speed driving leads to an increase in battery discharge current, and a high-rate battery discharge current exacerbates battery heating, thereby increasing the perceived temperature of the battery.

[0036] In step S4, the battery discharge curve can be adjusted at least based on the determined sensing temperature curve. Here, the unadjusted battery discharge curve can be determined through the following test: the battery's state parameters are detected at various ambient temperatures, and the battery's operating voltage is determined as a function of discharge time or discharge capacity based on the detected state parameters. The battery's state parameters include the battery's operating voltage, discharge current, and / or discharge capacity. Since the sensing temperature curve fully considers the impact of changes in ambient temperature and battery discharge current on the battery's temperature during vehicle operation, it is closer to the actual internal temperature of the battery under operating conditions than the battery surface temperature or ambient temperature measured by sensors. Using the determined sensing temperature curve, the battery discharge curve obtained from test data at various ambient temperatures can be adjusted. The method and extent of the adjustment can be determined using data from a series of tests.

[0037] According to the above embodiments of this application, the ambient temperature change curve along the entire navigation route is predicted using the ambient temperature forecast information at each key location along the route at the estimated arrival time of the vehicle. The battery's perceived temperature curve is determined using the predicted ambient temperature change curve and the vehicle's speed change curve. This fully considers the impact of changes in ambient temperature and battery discharge current on the battery's body temperature during vehicle operation. Based on the determined perceived temperature curve, the battery's discharge curve is adjusted so that it more closely reflects the actual discharge process of the battery when the vehicle is traveling along the navigation route. This enables a more accurate assessment of the battery's operating performance and lays the foundation for more accurate prediction of the vehicle's range and adjustment of the battery's operating strategy.

[0038] Figure 2 A flowchart illustrating a method for adjusting a battery discharge profile according to another exemplary embodiment of this application is shown. The following only describes the method in relation to... Figure 1 The differences between the embodiments shown are omitted for brevity, and the same steps will not be repeated.

[0039] like Figure 2As shown, the method may include step S5. In step S5, the power consumption information of the vehicle air conditioner can be estimated based on the power parameters of the vehicle air conditioner and the predicted change curve, and the battery discharge curve can be adjusted based at least on the estimated power consumption information. Here, based on the predicted change curve, it is possible to predict in which driving segments the user will need to use the air conditioner, and the predicted driving time of these driving segments. For example, the air conditioner cooling function is usually used in driving segments with higher ambient temperatures, and the air conditioner heating function is usually used in driving segments with lower ambient temperatures. Therefore, the power consumption information of the vehicle air conditioner can be estimated based on the power parameters of the vehicle air conditioner and the predicted driving time of these driving segments. Since the battery discharge current increases during the operation of the vehicle air conditioner, the battery discharge current ratio during vehicle driving can be adjusted based at least on the estimated power consumption information, and the battery discharge curve can be adjusted to the discharge curve under the corresponding discharge current ratio. The method and degree of adjustment can also be determined through a series of test data. In this way, the power consumption of the vehicle air conditioner with changes in ambient temperature during vehicle driving is fully considered when adjusting the battery discharge curve, thereby further improving the prediction accuracy of battery performance.

[0040] Figure 3 A flowchart illustrating a method for adjusting a battery discharge profile according to another exemplary embodiment of this application is shown. The following only describes the method in relation to... Figure 2 The differences between the embodiments shown are omitted for brevity, and the same steps will not be repeated.

[0041] like Figure 3 As shown, the method may further include step S6. In step S6, the battery discharge curve may be adjusted based at least on driving operation parameters collected during the driver's operation, wherein the driving operation parameters include, for example, acceleration operation parameters and / or braking operation parameters. During vehicle acceleration, the vehicle motor needs to output high torque instantaneously, causing the battery to discharge at a high rate, leading to significant ohmic polarization and concentration polarization. In particular, frequent rapid acceleration causes the battery operating voltage to drop rapidly, causing the battery discharge curve to reach the cutoff voltage prematurely and stop the discharge process. During vehicle braking, the motor switches to generator mode, thereby converting kinetic energy into electrical energy to feed back to the battery. The pulse current from braking recovery easily induces transient polarization within the battery, causing a brief increase and slow decrease in battery voltage. Especially in congested traffic, frequent braking causes these voltage fluctuations to superimpose on the battery discharge curve, forming local bulges or depressions, resulting in step-like fluctuations in the battery discharge curve and increasing the slope of the battery discharge curve. In this way, the driver's driving habits are fully considered when adjusting the battery discharge curve, so that the adjusted battery discharge curve is closer to the actual discharge process of the battery when the vehicle is traveling along the navigation route.

[0042] Figure 4 A flowchart illustrating a method for adjusting a battery discharge profile according to another exemplary embodiment of this application is shown. The following only describes the method in relation to... Figure 3 The differences between the embodiments shown are omitted for brevity, and the same steps will not be repeated.

[0043] like Figure 4 As shown, the method may further include step S7. In step S7, the vehicle's driving range can be estimated and / or the battery's discharge strategy can be adjusted, at least based on the battery's adjusted discharge curve. For the adjusted discharge curve, for example, the inflection point of the battery discharge curve can be determined by differentiation. Discharge will stop when the battery's operating voltage is lower than a preset cutoff voltage, thereby redetermining the battery's effective discharge range, making the estimated vehicle driving range more accurate, especially considering the impact of ambient temperature changes, driver operating habits, and the power consumption of the vehicle's air conditioning system as ambient temperature changes on the vehicle's driving range.

[0044] For example, when the discharge slope of the adjusted battery discharge curve increases significantly, it can be determined that the vehicle may experience frequent rapid acceleration and / or braking operations during driving. This can increase the battery's discharge cutoff voltage, causing the battery to terminate the discharge process earlier, thereby effectively reducing the impact of improper driver operation on battery life.

[0045] In addition, it should be noted that the step numbers described herein do not necessarily represent the order of steps, but are merely a reference numeral. The order may be changed depending on the specific circumstances, as long as the technical objective of this application can be achieved.

[0046] Figure 5 A schematic diagram of a vehicle 1 for adjusting a battery discharge curve according to an exemplary embodiment of this application is shown.

[0047] like Figure 5 As shown, vehicle 1 is equipped with a battery management system 10, which may include the following components:

[0048] - Information acquisition unit 11, configured to acquire, based on vehicle navigation information, the vehicle's speed change curve and ambient temperature forecast information at key locations along the navigation route at the vehicle's estimated arrival time; and

[0049] - Control unit 12, which is used to perform the method according to this application.

[0050] It should be understood that the terms “first,” “second,” “third,” etc., used in this document are for descriptive purposes only and should not be construed as indicating or implying relative importance, nor should they be construed as implicitly specifying the number of technical features indicated.

[0051] If an embodiment includes an "and / or" association between a first feature and a second feature, it should be interpreted as follows: according to one implementation, the embodiment has not only the first feature but also the second feature; according to another implementation, the embodiment has either only the first feature or only the second feature.

[0052] Although specific embodiments have been described above, these embodiments are not intended to limit the scope of this application, even when only a single embodiment is described with respect to a particular feature. The feature examples provided in this application are intended for illustrative purposes and not for limitation, unless otherwise stated. In practice, multiple features may be combined with each other as needed and where technically feasible. Various substitutions, modifications, and alterations are also conceived without departing from the spirit and scope of this application.

Claims

1. A method for adjusting a battery discharge profile, the method comprising: Based on the vehicle's navigation information, obtain the vehicle's speed change curve and the ambient temperature forecast information of each key location along the navigation route at the vehicle's estimated arrival time. Based on the obtained ambient temperature forecast information, predict the change curve of ambient temperature along the navigation route with respect to the estimated arrival time of the vehicle; The battery's sensing temperature curve is determined based on the predicted change curve and the speed change curve. as well as The battery discharge curve is adjusted based at least on the determined sensing temperature curve.

2. The method according to claim 1, wherein, Based on the ambient temperature forecast information of each key location along the navigation route at the estimated arrival time of the vehicle, the predicted ambient temperature information of other locations along the navigation route at the estimated arrival time of the vehicle is obtained by interpolation. Then, using the ambient temperature forecast information of each key location along the route and the predicted ambient temperature information of other locations along the route, the change curve of the ambient temperature along the navigation route with respect to the estimated arrival time of the vehicle is determined.

3. The method according to any one of the preceding claims, wherein, The method further includes: The power consumption information of the vehicle air conditioner is estimated based on the power parameters of the vehicle air conditioner and the predicted change curve, and the battery discharge curve is adjusted based on at least the estimated power consumption information.

4. The method according to any one of the preceding claims, wherein, Based on the vehicle's navigation information, the vehicle's speed change curve is obtained, and the estimated arrival time of the vehicle at each key location along the navigation route is calculated. The ambient temperature forecast information of each key location along the navigation route at the estimated arrival time of the vehicle is obtained from the backend server.

5. The method according to any one of the preceding claims, wherein, The unadjusted discharge profile of the battery is determined by the following test: the battery's state parameters are detected at various ambient temperatures, and the change curve of the battery's operating voltage with respect to discharge time or discharge capacity is determined based on the detected state parameters, wherein the battery's state parameters include the battery's operating voltage, discharge current, and / or discharge capacity.

6. The method according to any one of the preceding claims, wherein, The method further includes: The battery discharge curve is adjusted based at least on driving operation parameters collected during the driver's driving, wherein the driving operation parameters include, for example, acceleration operation parameters and / or braking operation parameters.

7. The method according to any one of the preceding claims, wherein, The method further includes: The vehicle's driving range can be estimated based at least on the battery's adjusted discharge profile, and / or the battery's operating strategy can be adjusted.

8. A battery management system (10), the battery management system (10) comprising the following components: Information acquisition unit (11), configured to acquire, based on vehicle navigation information, the vehicle's speed change curve and ambient temperature forecast information for key locations along the navigation route at the vehicle's estimated arrival time; and Control unit (12) for performing the method according to any one of the preceding claims.

9. A vehicle (1) comprising a battery management system (10) according to claim 8.

10. A computer program product, such as a computer-readable program carrier, comprising or storing computer program instructions that, when executed by a processor, at least auxiliaryly implement the steps of the method according to any one of claims 1 to 7.

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