Automatic heating control method and device for electric vehicle battery pack and electric vehicle

Abstract

The present invention relates to the field of vehicle control technology, and in particular to a method for automatically controlling the heating of an electric vehicle battery pack, comprising: obtaining GPS information of the vehicle's location and location information of the vehicle at its destination, determining the vehicle's route and distance; obtaining the remaining power and current temperature information of the battery pack, calculating the amount of power required for the vehicle to reach the destination based on the distance traveled, calculating the amount of power required for the vehicle to reach the destination after preheating the battery compared to the current location based on the current temperature information, and determining whether the remaining power of the battery pack is sufficient for the vehicle to reach the destination; if the remaining power is sufficient for the vehicle to reach the destination, obtaining ambient temperature information of the battery pack during vehicle travel, determining whether the ambient temperature information reaches a temperature threshold of the battery pack, determining whether heating needs to be initiated, and sending a corresponding heating instruction based on a heating strategy. The present invention can improve the efficiency of battery heating and reduce the amount of power consumed by heating during travel.

Description

Technical Field

[0001] The present invention relates to the field of vehicle control technology, and in particular to an automatic heating control method and device for an electric vehicle battery pack and the electric vehicle. Background Art

[0002] Currently, electric vehicles have an increasingly higher market share. The discharge capacity of electric vehicle batteries is greatly affected by the ambient temperature. When electric vehicles are in a low temperature environment (such as winter), the performance of the battery cells will decline, and the demand for cabin heating will increase, thereby reducing the efficiency of the power system and the braking energy feedback function, which in turn affects the cruising range of the electric vehicle.

[0003] In the relevant technology, when the battery temperature is lower than the normal operating temperature, the corresponding heating method is determined according to the current temperature of the battery, and the battery is heated according to the determined heating method to heat the battery to the target temperature, thereby avoiding the battery temperature being too low. The battery pack heating method currently on the market generally adopts a fixed temperature threshold for heating, and the heating current is single and fixed, which cannot reasonably allocate the power consumed by battery heating. In addition, since the actual driving environment of the vehicle is relatively complex, for some complex driving environments, heating the battery to a fixed target temperature through a heating method determined by the battery temperature may have the problem of low heating efficiency, resulting in poor cruising range. In other words, the current battery heating method for low temperature environments is not flexible enough. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: in order to solve the technical problem that the battery heating method in low-temperature environment in the existing technology is not flexible enough, the present invention provides an automatic heating control method for electric vehicle battery packs, which can flexibly select appropriate heating methods for different driving environments, thereby improving the efficiency of battery heating, reducing the power consumption of heating during driving, and increasing the vehicle's cruising range.

[0005] The technical solution adopted by the present invention to solve the technical problem is: an automatic heating control method for an electric vehicle battery pack, the control method comprising:

[0006] Start the vehicle in autonomous driving mode and enter the destination;

[0007] Obtain GPS information of the vehicle's geographic location and the location information of the vehicle at its destination, and determine the vehicle's route, distance traveled, and current and destination road conditions based on the GPS information, location information, and map information;

[0008] Obtaining the remaining charge and current temperature information of the battery pack, calculating the amount of power required for the vehicle to reach the destination based on the travel distance, and calculating the amount of power required for the vehicle to reach the destination after preheating the battery compared to the current location based on the current temperature information, and determining whether the remaining charge of the battery pack is sufficient to enable the vehicle to reach the destination;

[0009] If the remaining power of the battery pack is enough to enable the vehicle to reach the destination, the ambient temperature information of the battery pack is obtained during the vehicle's driving process. Based on the ambient temperature information, it is determined whether the ambient temperature information reaches the temperature threshold of the battery pack, and whether the vehicle needs to start heating. The corresponding heating instruction is sent according to the heating strategy.

[0010] Furthermore, specifically, the heating strategy includes:

[0011] If the ambient temperature information is lower than or equal to the temperature threshold of the battery pack, directly starting a fixed preheating current for the battery pack;

[0012] If the ambient temperature information is higher than the temperature threshold of the battery pack, the remaining driving distance of the vehicle is determined compared with multiple set distance values ​​to determine whether heating needs to be started, and different distance values ​​correspond to different heating conditions.

[0013] Further, specifically, if the ambient temperature information is lower than or equal to the temperature threshold of the battery pack, a fixed pre-heating current is directly started for the battery pack. After the battery pack is heated, the ambient temperature information of the battery pack during vehicle driving is continued to be obtained. If the ambient temperature information is higher than the temperature threshold of the battery pack, the remaining driving distance of the vehicle is determined compared with the set multiple distance values ​​to determine whether heating needs to be started.

[0014] Further, specifically, the multiple distance values ​​are determined after calibration based on the driving distance of the vehicle, the remaining power of the battery pack and the road condition information.

[0015] Further, specifically, the plurality of distance values ​​are three distance values, and the three distance values ​​are respectively a distance value S1, a distance value S2, and a distance value S3;

[0016] Different distance values ​​correspond to different heating conditions including:

[0017] When the remaining driving distance of the vehicle is less than the distance value S1, heating is not started;

[0018] When the distance value S1 is greater than the remaining driving distance of the vehicle and less than the distance value S2, the first-stage preheating is started. The heating current of the first-stage preheating is: y1 = a*Ib, where I is the current required to provide power to the vehicle, a is the current influencing factor of the vehicle power during driving, and b is the heating compensation factor in the case of a sudden change in the vehicle power current. b can be a positive or negative value.

[0019] When the remaining driving distance of the vehicle is greater than the distance value S3, the secondary preheating is started, and the heating current of the secondary preheating is: Y2 = c*Ib, where c is slightly smaller than a;

[0020] Furthermore, specifically, the battery pack is directly started with a fixed preheating current time of T1, and when the fixed preheating of the battery pack is started, the vehicle voice reminds the user that the ambient temperature information is too low.

[0021] An automatic heating control device for an electric vehicle battery pack, the control device adopts the automatic heating control method for an electric vehicle battery pack as described above, and the control device comprises:

[0022] The autonomous driving controller includes a navigation system that obtains GPS information of the vehicle's geographic location and the vehicle's location information at the destination by setting the destination, and determines the vehicle's route, distance traveled, and current and destination road condition information based on the GPS information, location information, and map information.

[0023] Battery pack, used to power the vehicle;

[0024] A temperature sensor is provided on the battery pack to collect ambient temperature information of the battery pack;

[0025] a battery management system, the battery management system monitoring the remaining power information of the battery pack and obtaining the ambient temperature information collected by the temperature sensor;

[0026] a vehicle controller, receiving the vehicle's route, distance traveled, current and destination road condition information, remaining battery information, and ambient temperature information, and calculating the amount of power required for the vehicle to reach the destination based on the distance traveled, as well as the amount of power required for the vehicle to reach the destination after preheating the battery compared to its current location; the vehicle controller, based on the ambient temperature information, determines whether the ambient temperature reaches a battery pack temperature threshold, determines whether the vehicle needs to initiate heating, and sends a corresponding heating instruction based on a heating strategy;

[0027] A vehicle actuator, to which the vehicle controller sends a control instruction, and the vehicle actuator receives the control instruction to control the vehicle to enter the automatic driving mode;

[0028] The automatic driving controller, the battery management system and the vehicle actuator are all connected to the vehicle controller, and the battery pack and the temperature sensor are both connected to the battery management system;

[0029] The battery management system receives a heating instruction from the vehicle controller and requests a heating current from the battery management system to heat the battery pack.

[0030] Further, specifically, the automatic driving controller receives the vehicle's driving route, driving distance, and current road condition information and the road condition information when the vehicle arrives at the destination determined by the navigation system, calculates the uniform speed and acceleration speed expected for the vehicle to reach the destination, and transmits the uniform speed and acceleration speed to the vehicle controller, and the vehicle controller transmits the received uniform speed and acceleration speed to the vehicle actuator.

[0031] An electric vehicle comprises the automatic heating control device for the electric vehicle battery pack as described above.

[0032] The beneficial effect of the present invention is that the automatic heating control method of the electric vehicle battery pack of the present invention pre-calculates the amount of electricity consumed by the vehicle at the current temperature when driving to the destination and the amount of electricity consumed by the battery pack in the preheating mode, and obtains the ambient temperature of the battery pack in real time. It can flexibly select the corresponding heating method for different driving environments, thereby improving the efficiency of battery heating, reducing the amount of electricity consumed by heating during driving, and improving the vehicle's cruising range. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The present invention will be further described below with reference to the accompanying drawings and examples.

[0034] Figure 1 Schematic diagram of the method of Example 1 of the present invention.

[0035] Figure 2 It is a structural diagram of embodiment 2 of the present invention.

[0036] In the figure, 1. Autonomous driving controller; 2. Vehicle controller; 3. Battery management system; 4. Battery pack; 5. Temperature sensor; 6. Vehicle actuator. DETAILED DESCRIPTION

[0037] The present invention will now be described in further detail with reference to the accompanying drawings, which are simplified schematic diagrams that illustrate the basic structure of the present invention in a schematic manner.

[0038] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, features defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0039] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0040] Example 1

[0041] like Figure 1 FIG. 1 is a first embodiment of the present invention, which is a method for controlling automatic heating of an electric vehicle battery pack. The method includes:

[0042] S101: Start the vehicle to enter the automatic driving mode and enter the destination;

[0043] S102: Obtaining GPS information of the vehicle's geographic location and location information of the vehicle at its destination, and determining the vehicle's driving route, driving distance, and current and destination road condition information based on the GPS information, location information, and map information;

[0044] S103: Obtaining the remaining power and current temperature information of the battery pack, calculating the power required for the vehicle to reach the destination based on the travel distance, and calculating the power required for the vehicle to reach the destination after preheating the battery compared to the current location based on the current temperature information, and determining whether the remaining power of the battery pack is sufficient for the vehicle to reach the destination;

[0045] S104: If the remaining battery charge is sufficient to allow the vehicle to reach its destination, the system obtains ambient temperature information about the battery pack during driving. Based on this ambient temperature information, the system determines whether the ambient temperature reaches a battery pack temperature threshold, determines whether the vehicle requires heating, and issues a corresponding heating instruction based on the heating strategy. This system flexibly selects a heating strategy based on the collected ambient temperature information, allowing for timely battery heating. This ensures battery life, improves battery heating efficiency, reduces heating power consumption during driving, and increases the vehicle's range.

[0046] In an embodiment, the heating strategy comprises:

[0047] If the ambient temperature information is lower than or equal to the temperature threshold of the battery pack, the fixed preheating current of the battery pack is directly started; the fixed preheating current time of the battery pack is directly started for T1, and when the fixed preheating of the battery pack is started, the vehicle voice reminds the user that the ambient temperature information is too low, to avoid the vehicle from continuing to drive and damaging the battery pack, thereby affecting the service life of the battery pack.

[0048] If the ambient temperature exceeds the battery pack's temperature threshold, the system determines whether heating should be activated based on the vehicle's remaining driving distance compared to multiple preset distance values. Different distance values ​​correspond to different heating conditions. This approach further improves battery heating efficiency, reduces heating power consumption during driving, and increases the vehicle's range.

[0049] It should be noted that a fixed pre-heating current is directly started for the battery pack. After the battery pack is heated, the ambient temperature information of the battery pack during vehicle driving is continued to be obtained. If the ambient temperature information is higher than the temperature threshold of the battery pack, the remaining driving distance of the vehicle is determined compared with the set multiple distance values ​​to determine whether heating needs to be started.

[0050] In an embodiment, the multiple distance values ​​are determined after calibration based on the vehicle's travel distance, the remaining power of the battery pack, and road condition information.

[0051] The heating condition is specifically described by taking three distance values ​​as an example, wherein the three distance values ​​are distance value S1, distance value S2 and distance value S3;

[0052] Different distance values ​​correspond to different heating conditions including:

[0053] (1) When the remaining driving distance of the vehicle is less than the distance value S1, the heating is not started;

[0054] (2) When the distance value S1 is greater than the remaining distance of the vehicle and less than the distance value S2, the first-stage preheating is started. The heating current of the first-stage preheating is: y1 = a*Ib, where I is the current required to provide power to the vehicle, a is the current influencing factor of the vehicle power during driving, and b is the heating compensation factor in the case of a sudden change in the vehicle power current. b can be a positive or negative value.

[0055] (3) When the remaining driving distance of the vehicle is greater than the distance value S3, the secondary preheating is started. The heating current of the secondary preheating is: Y2 = c*Ib, where c is slightly smaller than a. When the driving distance is long, the electric vehicle consumes more electricity and the current map is too large, which will cause the vehicle's mileage to decrease. Here, c is slightly smaller than a. The heating current of the secondary preheating is slightly smaller than the heating current of the primary preheating. When the driving distance is long, it can further improve the efficiency of battery heating, reduce the power consumption during driving, and further improve the vehicle's cruising range.

[0056] Implementing different heating conditions for different mileage values ​​can effectively heat the battery, effectively reduce the power consumed when heating the battery pack during driving, improve the vehicle's endurance, and increase the service life of the battery pack.

[0057] The automatic heating control method of the electric vehicle battery pack of the present invention pre-calculates the amount of electricity consumed by the vehicle at the current temperature when driving to the destination and the amount of electricity consumed by the battery pack in the pre-heating mode, and obtains the ambient temperature of the battery pack in real time. It can flexibly select the corresponding heating method for different driving environments, thereby improving the efficiency of battery heating, reducing the amount of electricity consumed by heating during driving, and increasing the vehicle's cruising range.

[0058] Example 2

[0059] Based on the same inventive concept as the automatic heating control method of an electric vehicle battery pack in the aforementioned embodiment, the present invention also provides an automatic heating control device for an electric vehicle battery pack, such as Figure 2As shown, the control device adopts the automatic heating control method of the electric vehicle battery pack as described above, and the control device includes: an automatic driving controller 1, including: a navigation system, by setting a destination, the navigation system obtains GPS information of the geographical location of the vehicle and the location information of the vehicle arriving at the destination, and determines the vehicle's driving route, driving distance and current and vehicle arrival destination road condition information based on the GPS information, location information and map information; a battery pack 4, used to power the vehicle; a temperature sensor 5, set on the battery pack 4, to collect the ambient temperature information of the battery pack 4; a battery management system 3, the battery management system 3 monitors the remaining power information of the battery pack 4 and obtains the ambient temperature information collected by the temperature sensor 5; a vehicle controller 2, which receives the vehicle's driving route The vehicle controller 2 determines whether the ambient temperature information reaches the temperature threshold of the battery pack 4 based on the ambient temperature information, determines whether the vehicle needs to start heating, and sends a corresponding heating instruction according to the heating strategy; the vehicle actuator 6, the vehicle controller 2 sends a control instruction to the vehicle actuator 6, and the vehicle actuator 6 receives the control instruction to control the vehicle to enter the automatic driving mode; the battery management system 3 receives the heating instruction from the vehicle controller 2, and requests a heating current from the battery management system 3 to heat the battery pack 4.

[0060] The automatic driving controller 1 , the battery management system 3 and the vehicle actuator 6 are all connected to the vehicle controller 2 , and the battery pack 4 and the temperature sensor 5 are both connected to the battery management system 3 .

[0061] It should be noted that the destination in the navigation system is set in advance by voice or mobile phone APP. The vehicle actuator 6 includes a vehicle brake pedal, an accelerator pedal, a control motor, etc., which are used to receive control instructions to control the operation of each vehicle actuator 6.

[0062] In an embodiment, the automatic driving controller 1 receives information about the vehicle's route, driving distance, and current and destination road conditions determined by the navigation system, calculates the uniform speed and acceleration speed required for the vehicle to reach the destination, and transmits the uniform speed and acceleration speed to the vehicle controller 2. The vehicle controller 2 transmits the received uniform speed and acceleration speed to the vehicle actuator 6 to control the vehicle to achieve automatic driving.

[0063] Example 3

[0064] Based on the same inventive concept as the automatic heating control device for an electric vehicle battery pack in the aforementioned embodiment, the present invention further provides an electric vehicle, which includes the automatic heating control device for an electric vehicle battery pack as described above.

[0065] With the above-described preferred embodiments of the present invention as a guide, and with reference to the above description, relevant personnel are fully capable of making various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the contents of the specification and must be determined according to the scope of the claims.

Claims

1. An automatic heating control method for an electric vehicle battery pack, characterized in that: The control method includes: Start the vehicle in autonomous driving mode and enter the destination; Obtain GPS information of the vehicle's geographic location and the location information of the vehicle at its destination, and determine the vehicle's route, distance traveled, and current and destination road conditions based on the GPS information, location information, and map information; Obtaining the remaining charge and current temperature information of the battery pack, calculating the amount of power required for the vehicle to reach the destination based on the travel distance, and calculating the amount of power required to preheat the battery after traveling from the vehicle's current location to the destination based on the current temperature information, and determining whether the remaining charge of the battery pack is sufficient to enable the vehicle to reach the destination; If the remaining power of the battery pack is enough to enable the vehicle to reach the destination, the ambient temperature information of the battery pack is obtained during the vehicle's driving process. Based on the ambient temperature information, it is determined whether the ambient temperature information reaches the temperature threshold of the battery pack, and whether the vehicle needs to start heating. The corresponding heating instruction is sent according to the heating strategy.

2. The automatic heating control method for an electric vehicle battery pack according to claim 1, characterized in that: The heating strategy includes: If the ambient temperature information is lower than or equal to the temperature threshold of the battery pack, directly starting a fixed preheating current for the battery pack; If the ambient temperature information is higher than the temperature threshold of the battery pack, the remaining driving distance of the vehicle is determined compared with multiple set distance values ​​to determine whether heating needs to be started, and different distance values ​​correspond to different heating conditions.

3. The automatic heating control method for an electric vehicle battery pack according to claim 2, characterized in that: If the ambient temperature information is lower than or equal to the temperature threshold of the battery pack, a fixed pre-heating current is directly started for the battery pack. After the battery pack is heated, the ambient temperature information of the battery pack during vehicle driving is continued to be obtained. When the ambient temperature information is higher than the temperature threshold of the battery pack, the remaining driving distance of the vehicle is determined compared with the set multiple distance values ​​to determine whether heating needs to be started.

4. The automatic heating control method for an electric vehicle battery pack according to claim 2, characterized in that: The multiple distance values ​​are determined after calibration based on the driving distance of the vehicle, the remaining power of the battery pack and the road condition information.

5. The automatic heating control method for an electric vehicle battery pack according to claim 4, characterized in that: The plurality of distance values ​​are three distance values, the three distance values ​​are respectively a distance value S1, a distance value S2 and a distance value S3, and the distance value S1 is less than the distance value S2 and is less than the distance value S3; Different distance values ​​correspond to different heating conditions including: When the remaining driving distance of the vehicle is less than the distance value S1, heating is not started; When the remaining driving distance of the vehicle is between the distance value S1 and the distance value S2, the first-stage preheating is started, and the heating current of the first-stage preheating is: y1 = a*Ib, where I is the current required to provide power to the vehicle, a is the current influencing factor of the vehicle power during driving, and b is the heating compensation factor in the case of a sudden change in the vehicle power current, and b can be a positive or negative value; When the remaining driving distance of the vehicle is greater than the distance value S3, the secondary preheating is started, and the heating current of the secondary preheating is: Y2 = c*Ib, where c is slightly smaller than a.

6. The automatic heating control method for an electric vehicle battery pack according to claim 2, characterized in that: The battery pack is directly started with a fixed preheating current time of T1, and when the fixed preheating of the battery pack is started, the vehicle voice reminds the user that the ambient temperature information is too low.

7. An automatic heating control device for an electric vehicle battery pack, characterized in that: The control device adopts the automatic heating control method of the electric vehicle battery pack according to any one of claims 1 to 6, and the control device includes: An automatic driving controller (1) includes a navigation system, wherein the navigation system obtains GPS information of the geographical location of the vehicle and location information of the vehicle at the destination by setting a destination, and determines the vehicle's driving route, driving distance, and current and destination road condition information based on the GPS information, location information, and map information; a battery pack (4) for supplying power to the vehicle; A temperature sensor (5) is provided on the battery pack (4) and collects ambient temperature information of the battery pack; A battery management system (3), the battery management system (3) monitoring the remaining power information of the battery pack (4) and obtaining the ambient temperature information collected by the temperature sensor (5); The vehicle controller (2) receives the vehicle's driving route, driving distance, current road condition information and road condition information at the destination, remaining power information, and the ambient temperature information, calculates the amount of power required for the vehicle to reach the destination based on the driving distance, and calculates the amount of power required for the vehicle to travel from the current location to the destination after preheating the battery based on the current temperature information; the vehicle controller (2) determines whether the ambient temperature information reaches a temperature threshold of the battery pack (4) based on the ambient temperature information, determines whether the vehicle needs to start heating, and sends a corresponding heating instruction based on the heating strategy; A vehicle actuator (6), wherein the vehicle controller (2) sends a control instruction to the vehicle actuator (6), and the vehicle actuator (6) receives the control instruction to control the vehicle to enter an automatic driving mode; The automatic driving controller (1), the battery management system (3) and the vehicle actuator (6) are all connected to the vehicle controller (2), and the battery pack (4) and the temperature sensor (5) are all connected to the battery management system (3); The battery management system (3) receives a heating instruction from the vehicle controller (2) and requests a heating current from the battery management system (3) to heat the battery pack.

8. The automatic heating control device for an electric vehicle battery pack according to claim 7, characterized in that: The automatic driving controller (1) receives information on the vehicle's driving route, driving distance, and current and destination road conditions determined by the navigation system, calculates the uniform speed and acceleration speed expected for the vehicle to reach the destination, and transmits the uniform speed and acceleration speed to the vehicle controller (2). The vehicle controller (2) transmits the received uniform speed and acceleration speed to the vehicle actuator (6).

9. An electric vehicle, characterized in that: An automatic heating control device for an electric vehicle battery pack comprising the device as described in any one of claims 7-8.

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