Thermal management control method, device and vehicle

Abstract

The present invention discloses a thermal management control method, device, and vehicle. The method includes: obtaining navigation information when the vehicle starts and begins driving; obtaining the vehicle's travel time to a target charging station based on the navigation information, and obtaining the required heating time of the vehicle's battery pack; when it is determined that the travel time exceeds the required heating time, obtaining vehicle speed information, battery status information, ambient temperature, and battery heating power consumption during battery pack discharge; and controlling the start and stop of battery pack heating based on the vehicle speed information, battery status information, ambient temperature, and battery heating power consumption. This improves the timeliness and control accuracy of start-stop thermal management control, thereby effectively increasing energy utilization and maximizing the vehicle's range.

Description

Technical Field

[0001] The present invention relates to the field of automobile technology, and in particular to a thermal management control method, device and vehicle. Background Art

[0002] With environmental concerns and energy crises becoming increasingly prominent, new energy electric vehicles (EVs), offering advantages such as fuel conservation, reduced emissions, high efficiency, and low noise, are becoming a trend in the automotive industry. Currently, existing EV BMS (Battery Management System) technology fails to consider actual driving conditions when managing battery pack thermal management. This results in untimely and inaccurate thermal management, which can waste energy and reduce vehicle range. Summary of the Invention

[0003] The present invention aims to at least partially address one of the technical problems in the related art. To this end, a first object of the present invention is to provide a thermal management control method that improves the timeliness and control accuracy of start-stop thermal management control, thereby effectively increasing energy utilization and maximizing the vehicle's range.

[0004] A second object of the present invention is to provide a vehicle.

[0005] A third objective of the present invention is to provide a thermal management control device.

[0006] To achieve the above-mentioned objectives, a first embodiment of the present invention proposes a thermal management control method, which includes: obtaining the navigation information of the vehicle when the vehicle starts and starts driving; obtaining the driving time of the vehicle to the target charging pile based on the navigation information, and obtaining the heating requirement time of the vehicle's battery pack; when it is determined that the driving time is greater than the heating requirement time, obtaining the vehicle's speed information, battery status information, ambient temperature, and battery heating power consumption during the battery pack discharge process; and controlling the start and stop of the battery pack heating according to the vehicle speed information, battery status information, ambient temperature and battery heating power consumption.

[0007] According to an embodiment of the present invention, the thermal management control method obtains navigation information when the vehicle starts and begins driving. Based on this information, it determines the driving time to the target charging station and the required heating time for the vehicle's battery pack. Furthermore, when it is determined that the driving time exceeds the required heating time, the method obtains vehicle speed information, battery status information, ambient temperature, and battery heating power consumption during battery pack discharge. The method then controls the start and stop of battery pack heating based on the vehicle speed information, battery status information, ambient temperature, and battery heating power consumption. This improves the timeliness and control accuracy of start-stop thermal management control, thereby effectively increasing energy utilization and maximizing the vehicle's range.

[0008] According to one embodiment of the present invention, when a vehicle is started and begins to travel, the battery pack is heated if all of the following conditions are met: (1) the temperature of the battery pack is less than or equal to a minimum heating temperature threshold; (2) the temperature difference between the cells in the battery pack is less than or equal to a temperature difference threshold; (3) the ambient temperature is less than or equal to an ambient temperature threshold; (4) the battery heating power consumption during the discharge process of the battery pack before the vehicle is started is less than or equal to a heating power consumption threshold; (5) the vehicle speed is greater than a vehicle speed threshold; and (6) the battery pack state of charge is greater than a first state of charge threshold.

[0009] According to one embodiment of the present invention, after the heating of the battery pack is turned on, the heating of the battery pack is stopped if any of the following conditions is met: (1) the temperature of the battery pack is greater than the maximum heating temperature threshold; (2) the temperature difference between the cells in the battery pack is greater than the temperature difference threshold; (3) the ambient temperature is greater than the ambient temperature threshold; (4) the current battery heating power consumption is greater than the heating power consumption threshold; (5) the average speed of the vehicle within a preset time is less than or equal to the speed threshold; (6) the state of charge of the battery pack is less than or equal to the first state of charge threshold; (7) the cumulative discharge amount of the battery pack after charging is completed is greater than or equal to the discharge amount threshold; (8) the state of charge of the battery pack is greater than the first state of charge threshold and less than or equal to the second state of charge threshold, and the ratio of the estimated battery heating power to the battery pack revenue power is greater than the ratio threshold, wherein the second state of charge threshold is greater than the first state of charge threshold.

[0010] According to one embodiment of the present invention, after the heating of the battery pack is stopped, the battery pack is heated and resumed if all of the following conditions are met: (1) the temperature of the battery pack is less than or equal to the minimum heating temperature threshold; (2) the temperature difference between the cells in the battery pack is less than or equal to the temperature difference threshold; (3) the ambient temperature is less than or equal to the ambient temperature threshold; (4) the battery heating power consumption before the heating is stopped is less than or equal to the heating power consumption threshold; (5) the average speed of the vehicle within a preset time is greater than the speed threshold; (6) the cumulative discharge amount of the battery pack after charging is completed is less than the discharge amount threshold; (7) the state of charge of the battery pack is greater than the second state of charge threshold, or the state of charge of the battery pack is greater than the first state of charge threshold and less than or equal to the second state of charge threshold, and the ratio of the estimated battery heating power to the battery pack's revenue power is less than or equal to the ratio threshold.

[0011] According to one embodiment of the present invention, the method further includes: obtaining the temperature difference of the battery pack to be heated and the average power consumption per unit temperature increase; obtaining the estimated battery heating power based on the temperature difference and the average power consumption; obtaining the capacity of the battery pack based on the temperature of the battery pack; obtaining the capacity attenuation ratio and the nominal capacity of the battery pack; and determining the revenue power of the battery pack based on the capacity, capacity attenuation ratio and nominal capacity of the battery pack.

[0012] According to one embodiment of the present invention, after the heating of the battery pack is turned on, the method further includes: obtaining the battery pack temperature, temperature rise rate, nominal mileage and average vehicle speed within a preset time; determining the mileage retention rate of the battery pack based on the temperature of the battery pack; and determining the water inlet temperature of the water cooling equipment for heating the battery pack based on the battery pack temperature, temperature rise rate, mileage retention rate, nominal mileage, state of charge of the battery pack, vehicle speed and average speed.

[0013] According to one embodiment of the present invention, the water inlet temperature of the water cooling device for heating the battery pack is determined by:

[0014] Tw=V0*[(25-T) / Vt] / [f(T)*R0*SOC / V]

[0015] Among them, Tw is the water inlet temperature of the water cooling equipment, V0 is the average vehicle speed, T is the temperature of the battery pack, Vt is the temperature rise rate, f(T) is the mileage retention rate, R0 is the nominal mileage, SOC is the state of charge of the battery pack, and V is the vehicle speed.

[0016] According to one embodiment of the present invention, the mileage retention rate of the battery pack is determined according to the temperature of the battery pack in the following manner:

[0017] f(T)=0.067*(T-25) 2 / 3025+0.6663*(T-25) / 55+0.9999

[0018] Where f(T) is the mileage retention rate and T is the temperature of the battery pack.

[0019] To achieve the above objectives, the second embodiment of the present invention proposes a vehicle, including: a memory, a processor, and a thermal management control program stored in the memory and executable on the processor. When the processor executes the program, the above thermal management control method is implemented.

[0020] According to an embodiment of the present invention, when the vehicle starts and begins driving, it obtains navigation information, and based on this information, it determines the driving time to the target charging station and the required heating time of the vehicle's battery pack. Furthermore, when it is determined that the driving time exceeds the required heating time, it obtains vehicle speed information, battery status information, ambient temperature, and battery heating power consumption during battery pack discharge. Based on this information, the vehicle controls the start and stop of battery pack heating. This improves the timeliness and control accuracy of start-stop thermal management control, thereby effectively increasing energy utilization and maximizing the vehicle's range.

[0021] To achieve the above-mentioned purpose, an embodiment of the third aspect of the present invention proposes a thermal management control device, which includes: a first acquisition module, used to obtain the navigation information of the vehicle when the vehicle starts and starts driving; a second acquisition module, used to obtain the driving time of the vehicle to the target charging pile based on the navigation information, and obtain the heating requirement time of the vehicle's battery pack; a third acquisition module, used to obtain the vehicle speed information, battery status information, ambient temperature, and battery heating power consumption during the discharge of the battery pack when it is determined that the driving time is greater than the heating requirement time; a control module, used to control the start and stop of the battery pack heating according to the vehicle speed information, battery status information, ambient temperature and battery heating power consumption.

[0022] According to an embodiment of the present invention, the thermal management control device uses a first acquisition module to acquire navigation information when the vehicle starts and begins driving. A second acquisition module uses this navigation information to acquire the vehicle's travel time to the target charging station and the required heating time of the vehicle's battery pack. When a third acquisition module determines that the travel time exceeds the required heating time, the device acquires vehicle speed information, battery status information, ambient temperature, and battery heating power consumption during battery pack discharge. The control module then controls the start and stop of battery pack heating based on the vehicle speed information, battery status information, ambient temperature, and battery heating power consumption. This improves the timeliness and control accuracy of thermal management start and stop control, thereby effectively increasing energy utilization and maximizing the vehicle's range.

[0023] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a flow chart of a thermal management control method according to one embodiment of the present invention;

[0025] Figure 2 is a structural block diagram of a vehicle according to one embodiment of the present invention;

[0026] Figure 3 FIG. 4 is a structural block diagram of a thermal management control device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0027] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0028] The following describes a thermal management control method, device, and vehicle provided by embodiments of the present invention with reference to the accompanying drawings.

[0029] Figure 1 is a flow chart of a thermal management control method according to an embodiment of the present invention, referring to Figure 1 As shown, the thermal management control method may include the following steps:

[0030] Step S101: When the vehicle starts and begins to travel, the navigation information of the vehicle is obtained.

[0031] Specifically, the user can input the destination address of the target charging station into the vehicle's navigation system before driving, and the navigation system can obtain the vehicle's starting address, and based on the vehicle's starting address and destination address, it can obtain navigation information such as the distance of this trip, current road conditions, and estimated driving time. When the vehicle is started and starts driving, the vehicle's navigation information can be obtained to perform precise thermal management control based on the navigation information.

[0032] Step S102: Obtaining the driving time of the vehicle to the target charging station based on the navigation information, and obtaining the required heating time of the vehicle's battery pack.

[0033] In other words, the driving time of the vehicle to the target charging station can be estimated through navigation information, and by obtaining the current temperature of the battery pack and the heating target temperature, the heating time required to heat the battery pack from the current temperature to the heating target temperature can be estimated.

[0034] Step S103: When it is determined that the driving time is greater than the required heating time, the vehicle speed information, battery status information, ambient temperature, and battery heating power consumption during the battery pack discharge process are obtained.

[0035] Specifically, the driving time and the required heating time are compared. If the driving time is less than the required heating time, even if the battery pack is heated on and off, the battery pack temperature will not reach the target heating temperature when the vehicle reaches the target charging station. In this case, the heating on and off control will not bring certain beneficial effects. Therefore, in this case, the battery pack heating on and off control is not performed. Conversely, if the driving time is greater than the required heating time, if the battery pack is heated on and off, the battery pack temperature will reach the target heating temperature before the vehicle reaches the target charging station. In this case, the heating on and off control can effectively improve energy utilization and fully utilize the vehicle's range. Therefore, in this case, the vehicle speed information, battery status information, ambient temperature, and battery heating power consumption during battery pack discharge can be further obtained to collect data information on whether to perform heating on and off control on the battery pack.

[0036] Step S104: Control the start and stop of heating of the battery pack according to the vehicle speed information, battery status information, ambient temperature and battery heating power consumption.

[0037] That is to say, the heating start and stop of the battery pack is controlled based on the vehicle speed information (specifically including the current vehicle speed), battery status information (specifically including the current battery state of charge), ambient temperature, and battery heating power consumption (specifically including the battery heating power consumption during the battery pack discharge process before the vehicle starts).

[0038] According to an embodiment of the present invention, the thermal management control method obtains navigation information when the vehicle starts and begins driving. Based on this information, it determines the driving time to the target charging station and the required heating time for the vehicle's battery pack. Furthermore, when it is determined that the driving time exceeds the required heating time, the method obtains vehicle speed information, battery status information, ambient temperature, and battery heating power consumption during battery pack discharge. The method then controls the start and stop of battery pack heating based on the vehicle speed information, battery status information, ambient temperature, and battery heating power consumption. This improves the timeliness and control accuracy of start-stop thermal management control, thereby effectively increasing energy utilization and maximizing the vehicle's range.

[0039] In one embodiment, when a vehicle is started and begins to travel, the battery pack is heated if all of the following conditions are met: (1) the temperature of the battery pack is less than or equal to a minimum heating temperature threshold; (2) the temperature difference between the cells in the battery pack is less than or equal to a temperature difference threshold; (3) the ambient temperature is less than or equal to an ambient temperature threshold; (4) the battery heating power consumption during the discharge process of the battery pack before the vehicle is started is less than or equal to a heating power consumption threshold; (5) the vehicle speed is greater than a vehicle speed threshold; and (6) the battery pack state of charge is greater than a first state of charge threshold.

[0040] Specifically, before the battery pack is heated, the following conditions must be met simultaneously: (1) the temperature of the battery pack is less than or equal to the minimum heating temperature threshold to ensure that the battery pack has a heating demand; (2) the temperature difference between the battery cells in the battery pack is less than or equal to the temperature difference threshold (such as 20°C) to ensure that a certain heating effect can be achieved; (3) the ambient temperature is less than or equal to the ambient temperature threshold (such as 20°C) to confirm the heating demand of the battery pack; (4) the battery heating power consumption during the battery pack discharge process before the vehicle is started is less than or equal to the heating power consumption threshold (such as 0.045E, where E is the nominal power), that is, to ensure that the heating power consumption does not occupy too much power and there is enough power for the vehicle to travel; (5) the vehicle speed is greater than the speed threshold (such as 2km / h). This is because this application only involves the situation where the vehicle is in a driving state, and the situation where the vehicle is in a stagnant state needs to be excluded; (6) the state of charge of the battery pack is greater than the first state of charge threshold (such as 2%) to prevent the heating battery from affecting the normal driving of the vehicle when the power is limited.

[0041] In one embodiment, after the heating of the battery pack is turned on, the heating of the battery pack is stopped if any of the following conditions is met: (1) the temperature of the battery pack is greater than the maximum heating temperature threshold; (2) the temperature difference between the cells in the battery pack is greater than the temperature difference threshold; (3) the ambient temperature is greater than the ambient temperature threshold; (4) the current battery heating power consumption is greater than the heating power consumption threshold; (5) the average speed of the vehicle within a preset time is less than or equal to the speed threshold; (6) the state of charge of the battery pack is less than or equal to the first state of charge threshold; (7) the cumulative discharge amount of the battery pack after charging is completed is greater than or equal to the discharge amount threshold; (8) the state of charge of the battery pack is greater than the first state of charge threshold and less than or equal to the second state of charge threshold, and the ratio of the estimated battery heating power to the battery pack revenue power is greater than the ratio threshold, wherein the second state of charge threshold is greater than the first state of charge threshold.

[0042] Specifically, before the battery pack is interrupted from heating, the following conditions must be met simultaneously: (1) the temperature of the battery pack is greater than the maximum heating temperature threshold to ensure that the battery pack needs to stop heating; (2) the temperature difference between the cells in the battery pack is greater than the temperature difference threshold (such as 20°C) to confirm that a certain heating effect cannot be achieved; (3) the ambient temperature is greater than the ambient temperature threshold (such as 20°C) to confirm the need to stop heating the battery pack; (4) the current battery heating power consumption is greater than the heating power consumption threshold (such as 0.045E, where E is the nominal power) to confirm that the heating power consumption is too large and continuing heating will affect the normal driving of the vehicle; (5) the average speed of the vehicle within a preset time (such as 10 minutes) is less than or equal to the speed threshold (such as 2km / h), that is, the vehicle is basically in a stagnant state and is not suitable for the battery pack heating of this application; 6) The state of charge of the battery pack is less than or equal to the first state of charge threshold (such as 2%). At this time, the power is limited and continuing to heat the battery pack will affect the normal driving of the vehicle; (7) After charging is completed, the cumulative discharge of the battery pack is greater than or equal to the discharge threshold (the discharge threshold here can be the product of the nominal power and the battery health) to ensure that the battery stops heating in the over-discharge state and prevent battery undervoltage, thermal runaway and other conditions; (8) The state of charge of the battery pack is greater than the first state of charge threshold (such as 2%) and less than or equal to the second state of charge threshold (such as 20%), and the ratio of the estimated battery heating power to the battery pack's revenue power is greater than the ratio threshold (such as 1), wherein the second state of charge threshold is greater than the first state of charge threshold, that is, when the state of charge of the battery pack is low, heating is stopped when the revenue power is low relative to the consumed power.

[0043] Furthermore, after the heating of the battery pack is stopped, the battery pack is heated and resumed if all of the following conditions are met: (1) the temperature of the battery pack is less than or equal to the minimum heating temperature threshold; (2) the temperature difference between the cells in the battery pack is less than or equal to the temperature difference threshold; (3) the ambient temperature is less than or equal to the ambient temperature threshold; (4) the battery heating power consumption before the heating is stopped is less than or equal to the heating power consumption threshold; (5) the average speed of the vehicle within a preset time is greater than the speed threshold; (6) the cumulative discharge amount of the battery pack after charging is completed is less than the discharge amount threshold; (7) the state of charge of the battery pack is greater than the second state of charge threshold, or the state of charge of the battery pack is greater than the first state of charge threshold and less than or equal to the second state of charge threshold, and the ratio of the estimated battery heating power to the battery pack's revenue power is less than or equal to the ratio threshold.

[0044] Specifically, before resuming heating of the battery pack, the following conditions must be met simultaneously: (1) the temperature of the battery pack is less than or equal to the minimum heating temperature threshold to ensure that the battery pack needs to resume heating; (2) the temperature difference between the cells in the battery pack is less than or equal to the temperature difference threshold (such as 20°C) to ensure that a certain heating effect can be achieved; (3) the ambient temperature is less than or equal to the ambient temperature threshold (such as 20°C) to confirm that the battery pack needs to resume heating; (4) the battery heating power consumption before heating stops is less than or equal to the heating power consumption threshold (such as 0.045E, where E is the nominal power), that is, the heating power consumption does not occupy too much power to ensure that there is enough power for the vehicle to travel after resuming heating; (5) the average speed of the vehicle within the preset time is greater than the speed threshold (such as 2km / h). h) to confirm that the vehicle is in a driving state; (6) after charging is completed, the cumulative discharge capacity of the battery pack is less than the discharge capacity threshold (the discharge capacity threshold here can be the product of the nominal capacity and the battery health) to ensure that the battery is not in an over-discharge state and prevent battery undervoltage, thermal runaway and other conditions; (7) the state of charge of the battery pack is greater than the second state of charge threshold (such as 20%), or the state of charge of the battery pack is greater than the first state of charge threshold (such as 2%) and less than or equal to the second state of charge threshold (such as 20%), and the ratio of the estimated battery heating capacity to the battery pack's revenue capacity is less than or equal to the ratio threshold (such as 1), that is, when the state of charge of the battery pack is high, or when the state of charge of the battery pack is low, heating is resumed when the revenue capacity is high relative to the consumed capacity.

[0045] Furthermore, the method also includes: obtaining the temperature difference of the battery pack to be heated and the average power consumption per unit temperature increase; obtaining the estimated battery heating power based on the temperature difference and the average power consumption; obtaining the capacity of the battery pack based on the temperature of the battery pack; obtaining the capacity attenuation ratio and nominal capacity of the battery pack; and determining the revenue power of the battery pack based on the capacity, capacity attenuation ratio and nominal capacity of the battery pack.

[0046] In a specific example, the battery heating capacity can be determined in the following ways:

[0047] Qh=Et*(25-T)

[0048] Among them, Qh is the estimated battery heating power, Et is the average power consumption for a unit temperature increase, which can be the average power consumption for the last 5°C temperature rise or the average power consumption in the last 15 minutes (in a specific example, the average power consumption can be calculated only when the minimum battery temperature rises by ≥7°C after heating is turned on), and 25-T is the temperature difference of the battery pack to be heated.

[0049] The battery pack's revenue can be determined in the following ways:

[0050] Qp=0.5*C(T)*E

[0051] Among them, Qp is the revenue capacity of the battery pack, 0.5 is the capacity attenuation ratio of the battery pack at -30°C (calibration quantity), C(T) is the capacity of the battery pack that changes with temperature, and E is the nominal capacity of the battery pack, which can be the product of the nominal capacity corresponding to 1C and the battery health.

[0052] In one embodiment, after the heating of the battery pack is turned on, the method also includes: obtaining the battery pack temperature, temperature rise rate, nominal mileage and average vehicle speed within a preset time; determining the mileage retention rate of the battery pack based on the temperature of the battery pack; determining the water inlet temperature of the water cooling equipment for heating the battery pack based on the battery pack temperature, temperature rise rate, mileage retention rate, nominal mileage, state of charge of the battery pack, vehicle speed and average speed.

[0053] Specifically, the water cooling device for heating the battery pack may be a WTC (Water Temperature Controller). In this embodiment, the water inlet temperature of the water cooling device for heating the battery pack may be determined by the following method:

[0054] Tw=V0*[(25-T) / Vt] / [f(T)*R0*SOC / V]

[0055] Among them, Tw is the water inlet temperature of the water cooling device. In the specific example, the temperature range of Tw can be [28, 45]; V0 is the average vehicle speed, and its initial value can be the average vehicle speed in the past 10 minutes. In the specific example, the initial value can be set to 28; T is the temperature of the battery pack; Vt is the temperature rise rate, which can be the temperature rise rate of the last 5°C, and its initial value can be set to 15; f(T) is the mileage retention rate; R0 is the nominal mileage; SOC is the state of charge of the battery pack, which can be based on the normal temperature capacity; V is the speed of the vehicle.

[0056] Specifically, the mileage retention rate of the battery pack can be determined according to the temperature of the battery pack in the following manner:

[0057] f(T)=0.067*(T-25) 2 / 3025+0.6663*(T-25) / 55+0.9999

[0058] Where f(T) is the mileage retention rate at different temperatures; T is the temperature of the battery pack.

[0059] In summary, the thermal management control method according to an embodiment of the present invention obtains the vehicle's navigation information when the vehicle starts and begins driving. Based on this information, it obtains the vehicle's travel time to the target charging station and the required heating time for the vehicle's battery pack. Furthermore, when it is determined that the travel time is greater than the required heating time, the method obtains the vehicle's speed information, battery status information, ambient temperature, and the battery heating power consumption during the battery pack discharge process. The method then performs heating start-stop control on the battery pack based on the vehicle speed information, battery status information, ambient temperature, and battery heating power consumption. This improves the timeliness and control accuracy of start-stop thermal management control, thereby effectively increasing energy utilization and maximizing the vehicle's range.

[0060] Figure 2 FIG. 1 is a structural block diagram of a vehicle according to an embodiment of the present invention. Figure 2 As shown, the vehicle 200 may include a memory 201, a processor 202, and a thermal management control program stored in the memory 201 and executable on the processor 202. When the processor 202 executes the program, the above-mentioned thermal management control method is implemented.

[0061] According to an embodiment of the present invention, when the vehicle starts and begins driving, it obtains navigation information, and based on this information, it determines the driving time to the target charging station and the required heating time of the vehicle's battery pack. Furthermore, when it is determined that the driving time exceeds the required heating time, it obtains vehicle speed information, battery status information, ambient temperature, and battery heating power consumption during battery pack discharge. Based on this information, the vehicle controls the start and stop of battery pack heating. This improves the timeliness and control accuracy of start-stop thermal management control, thereby effectively increasing energy utilization and maximizing the vehicle's range.

[0062] Figure 3 FIG. 1 is a block diagram of a thermal management control device according to an embodiment of the present invention. Figure 3 As shown, the thermal management control device 300 includes a first acquisition module 301 , a second acquisition module 302 , a third acquisition module 303 and a control module 304 .

[0063] Among them, the first acquisition module 301 is used to obtain the vehicle's navigation information when the vehicle starts and starts driving; the second acquisition module 302 is used to obtain the vehicle's driving time to the target charging pile based on the navigation information, and obtain the heating requirement time of the vehicle's battery pack; the third acquisition module 303 is used to obtain the vehicle's speed information, battery status information, ambient temperature, and battery heating power consumption during the battery pack discharge process when it is determined that the driving time is greater than the heating requirement time; the control module 304 is used to control the start and stop of the battery pack heating according to the vehicle speed information, battery status information, ambient temperature and battery heating power consumption.

[0064] In one embodiment, the control module 304 is further configured to: when the vehicle is started and begins to travel, start heating the battery pack if all of the following conditions are met: (1) the temperature of the battery pack is less than or equal to the minimum heating temperature threshold; (2) the temperature difference between the cells in the battery pack is less than or equal to the temperature difference threshold; (3) the ambient temperature is less than or equal to the ambient temperature threshold; (4) the battery heating power consumption during the discharge process of the battery pack before the vehicle is started is less than or equal to the heating power consumption threshold; (5) the vehicle speed is greater than the vehicle speed threshold; and (6) the state of charge of the battery pack is greater than the first state of charge threshold.

[0065] In one embodiment, the control module 304 is further configured to stop heating the battery pack after the heating of the battery pack is turned on if any of the following conditions is met: (1) the temperature of the battery pack is greater than a maximum heating temperature threshold; (2) the temperature difference between the cells in the battery pack is greater than a temperature difference threshold; (3) the ambient temperature is greater than an ambient temperature threshold; (4) the current battery heating power consumption is greater than a heating power consumption threshold; (5) the average speed of the vehicle within a preset time is less than or equal to a speed threshold; (6) the state of charge of the battery pack is less than or equal to a first state of charge threshold; (7) the cumulative discharge amount of the battery pack after charging is completed is greater than or equal to a discharge amount threshold; (8) the state of charge of the battery pack is greater than the first state of charge threshold and less than or equal to a second state of charge threshold, and the ratio of the estimated battery heating power to the battery pack's benefit power is greater than a ratio threshold, wherein the second state of charge threshold is greater than the first state of charge threshold.

[0066] In one embodiment, the control module 304 is further configured to resume heating the battery pack after heating of the battery pack is stopped if all of the following conditions are met: (1) the temperature of the battery pack is less than or equal to a minimum heating temperature threshold; (2) the temperature difference between the cells in the battery pack is less than or equal to a temperature difference threshold; (3) the ambient temperature is less than or equal to an ambient temperature threshold; (4) the battery heating power consumption before heating is stopped is less than or equal to a heating power consumption threshold; (5) the average speed of the vehicle within a preset time is greater than a speed threshold; (6) the cumulative discharge amount of the battery pack after charging is completed is less than a discharge amount threshold; (7) the state of charge of the battery pack is greater than a second state of charge threshold, or the state of charge of the battery pack is greater than the first state of charge threshold and less than or equal to the second state of charge threshold, and the ratio of the estimated battery heating power to the battery pack's revenue power is less than or equal to a ratio threshold.

[0067] In one embodiment, the control module 304 is further used to: obtain the temperature difference of the battery pack to be heated and the average power consumption for increasing unit temperature; obtain the estimated battery heating power based on the temperature difference and the average power consumption; obtain the capacity of the battery pack based on the temperature of the battery pack; obtain the capacity attenuation ratio and the nominal capacity of the battery pack; and determine the revenue power of the battery pack based on the capacity, capacity attenuation ratio and nominal capacity of the battery pack.

[0068] In one embodiment, the control module 304 is also used to: obtain the battery pack temperature, temperature rise rate, nominal mileage and average vehicle speed within a preset time; determine the mileage retention rate of the battery pack based on the battery pack temperature; determine the water inlet temperature of the water cooling equipment for heating the battery pack based on the battery pack temperature, temperature rise rate, mileage retention rate, nominal mileage, state of charge of the battery pack, vehicle speed and average speed.

[0069] In one embodiment, the control module 304 is specifically configured to determine the water inlet temperature of the water cooling device for heating the battery pack by:

[0070] Tw=V0*[(25-T) / Vt] / [f(T)*R0*SOC / V]

[0071] Among them, Tw is the water inlet temperature of the water cooling equipment, V0 is the average vehicle speed, T is the temperature of the battery pack, Vt is the temperature rise rate, f(T) is the mileage retention rate, R0 is the nominal mileage, SOC is the state of charge of the battery pack, and V is the vehicle speed.

[0072] In one embodiment, the control module 304 is specifically configured to determine the mileage retention rate of the battery pack according to the temperature of the battery pack in the following manner:

[0073] f(T)=0.067*(T-25) 2 / 3025+0.6663*(T-25) / 55+0.9999

[0074] Where f(T) is the mileage retention rate and T is the temperature of the battery pack.

[0075] It should be noted that for the description of the thermal management control device in this application, please refer to the description of the thermal management control method in this application, and the details will not be repeated here.

[0076] It should be understood that although Figure 1 The steps in the flowchart are shown in sequence as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified in this document, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. In addition, Figure 1 At least part of the steps may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed in turn or alternately with other steps or at least part of the sub-steps or stages of other steps.

[0077] It should be noted that the logic and / or steps represented in the flowcharts or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing the logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, apparatus, or device (such as a computer-based system, a system including a processor, or other system that can fetch and execute instructions from an instruction execution system, apparatus, or device), or in conjunction with such instruction execution system, apparatus, or device. For the purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transmit a program for use by an instruction execution system, apparatus, or device, or in conjunction with such instruction execution system, apparatus, or device. More specific examples (non-exhaustive list) of computer-readable media include the following: an electrical connection portion having one or more wires (electronic device), a portable computer disk cartridge (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and programmable read-only memory (EPROM or flash memory), fiber optic devices, and portable compact disc read-only memory (CDROM). Furthermore, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing it in another suitable manner if necessary, and then storing it in a computer memory.

[0078] It should be understood that various parts of the present invention can be implemented using hardware, software, firmware, or a combination thereof. In the above-described embodiments, multiple steps or methods can be implemented using software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented using hardware, as in another embodiment, any one of the following technologies known in the art or a combination thereof can be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application-specific integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0079] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0080] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0081] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0082] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A thermal management control method, characterized in that: The method comprises: When the vehicle is started and begins to travel, obtaining navigation information of the vehicle; Obtaining a driving time for the vehicle to reach a target charging station based on the navigation information, and obtaining a heating time required for a battery pack of the vehicle; When it is determined that the driving time is greater than the required heating time, obtaining vehicle speed information, battery status information, ambient temperature, and battery heating power consumption during the discharge process of the battery pack; performing heating start and stop control on the battery pack according to the vehicle speed information, the battery status information, the ambient temperature, and the battery heating power consumption; After the heating of the battery pack is turned on, the method further includes: Obtaining the battery pack's temperature, temperature rise rate, nominal mileage, and average vehicle speed within a predetermined time period; determining a mileage retention rate of the battery pack according to the temperature of the battery pack; determining a water inlet temperature of a water cooling device for heating the battery pack based on the temperature of the battery pack, the temperature rise rate, the mileage retention rate, the nominal mileage, the state of charge of the battery pack, the speed of the vehicle, and the average speed; The water inlet temperature of the water cooling device for heating the battery pack is determined by the following method: Tw=V0*[(25-T) / Vt] / [f(T)*R0*SOC / V] Wherein, Tw is the water inlet temperature of the water cooling device, V0 is the average vehicle speed, T is the temperature of the battery pack, Vt is the temperature rise rate, f(T) is the mileage retention rate, R0 is the nominal mileage, SOC is the state of charge of the battery pack, and V is the speed of the vehicle.

2. The thermal management control method according to claim 1, characterized in that: When the vehicle is started and begins to travel, the battery pack is heated if all of the following conditions are met: (1) The temperature of the battery pack is less than or equal to the minimum heating temperature threshold; (2) The temperature difference between the cells in the battery pack is less than or equal to the temperature difference threshold; (3) The ambient temperature is less than or equal to the ambient temperature threshold; (4) The battery heating power consumption during the discharge of the battery pack before the vehicle is started is less than or equal to the heating power consumption threshold; (5) The speed of the vehicle is greater than the speed threshold; (6) The state of charge of the battery pack is greater than a first state of charge threshold.

3. The thermal management control method according to claim 2, characterized in that: After the heating of the battery pack is started, if any of the following conditions is met, the heating of the battery pack is stopped: (1) The temperature of the battery pack is greater than the maximum heating temperature threshold; (2) The temperature difference between the cells in the battery pack is greater than the temperature difference threshold; (3) The ambient temperature is greater than the ambient temperature threshold; (4) The current battery heating power consumption is greater than the heating power consumption threshold; (5) The average speed of the vehicle within a preset time period is less than or equal to the speed threshold; (6) The state of charge of the battery pack is less than or equal to the first state of charge threshold; (7) After charging is completed, the cumulative discharge capacity of the battery pack is greater than or equal to the discharge capacity threshold; (8) The state of charge of the battery pack is greater than the first state of charge threshold and less than or equal to a second state of charge threshold, and the ratio of the estimated battery heating power to the battery pack's revenue power is greater than a ratio threshold, wherein the second state of charge threshold is greater than the first state of charge threshold.

4. The thermal management control method according to claim 3, characterized in that: After the heating of the battery pack is stopped, the heating of the battery pack is resumed if all of the following conditions are met: (1) The temperature of the battery pack is less than or equal to the minimum heating temperature threshold; (2) The temperature difference between the battery cells in the battery pack is less than or equal to the temperature difference threshold; (3) The ambient temperature is less than or equal to the ambient temperature threshold; (4) The battery heating power consumption before heating stops is less than or equal to the heating power consumption threshold; (5) The average speed of the vehicle within a preset time period is greater than the speed threshold; (6) After charging is completed, the cumulative discharge capacity of the battery pack is less than the discharge capacity threshold; (7) The state of charge of the battery pack is greater than the second state of charge threshold, or the state of charge of the battery pack is greater than the first state of charge threshold and less than or equal to the second state of charge threshold, and the ratio of the estimated battery heating power to the battery pack's revenue power is less than or equal to the ratio threshold.

5. The thermal management control method according to any one of claims 3 or 4, characterized in that: The method further comprises: Obtaining a temperature difference of the battery pack to be heated and an average power consumption per unit temperature increase; Obtaining the estimated battery heating power according to the temperature difference to be heated and the average power consumption; Obtaining the capacity of the battery pack according to the temperature of the battery pack; Obtaining the capacity attenuation ratio and nominal capacity of the battery pack; The yield capacity of the battery pack is determined according to the capacity of the battery pack, the capacity attenuation ratio, and the nominal capacity.

6. The thermal management control method according to claim 1, characterized in that: The mileage retention rate of the battery pack is determined according to the temperature of the battery pack in the following manner: f(T)=0.067*(T-25)2 / 3025+0.6663*(T-25) / 55+0.9999 Wherein, f(T) is the mileage retention rate, and T is the temperature of the battery pack.

7. A vehicle, characterized in that: include: A memory, a processor, and a thermal management control program stored in the memory and executable on the processor, wherein when the processor executes the program, the thermal management control method according to any one of claims 1 to 6 is implemented.

8. A thermal management control device, characterized in that: The device comprises: A first acquisition module is used to acquire navigation information of the vehicle when the vehicle is started and begins to travel; a second acquisition module, configured to acquire a travel time for the vehicle to reach a target charging pile based on the navigation information, and acquire a required heating time for a battery pack of the vehicle; a third acquisition module, configured to acquire vehicle speed information, battery status information, ambient temperature, and battery heating power consumption during the discharge of the battery pack when determining that the driving time is greater than the required heating time; A control module is used to control the start and stop of heating of the battery pack according to the vehicle speed information, the battery status information, the ambient temperature and the battery heating power consumption.

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