Electric vehicle battery temperature control methods, devices, vehicles and storage media

Abstract

This application provides a method, device, vehicle, and storage medium for controlling the temperature of an electric vehicle battery. The vehicle includes an air conditioning indirect coolant circuit and a battery indirect coolant circuit that exchange heat through an indirect heat exchanger. The method includes: acquiring the battery temperature and the outside ambient temperature when the vehicle is in charging mode and the air conditioning system is operating in heating mode; adjusting the operating state of the battery indirect coolant circuit to improve the heat exchange efficiency with the air conditioning indirect coolant circuit when the outside ambient temperature is less than or equal to an ambient temperature threshold and the battery temperature is greater than a first battery temperature threshold; and sending a passive cooling command for the battery to the air conditioning system controller to instruct the air conditioning system controller to adjust the state of the air conditioning indirect coolant circuit according to the passive cooling command. This application can fully utilize battery heat to heat the passenger compartment in low-temperature environments, improving energy conversion efficiency and utilization, while also improving the heating efficiency of the air conditioning system.

Description

Technical Field

[0001] This application relates to the field of electric vehicle technology, and in particular to a method, device, vehicle, and storage medium for controlling the temperature of an electric vehicle battery. Background Technology

[0002] Electric vehicle charging is an indispensable part of users' daily lives. With the increasing market share of electric vehicles and the growing concern about the safety of electric vehicle charging, it is urgent to address users' concerns about excessively long charging times, taking into account both energy conservation and safety.

[0003] In the process of implementing the embodiments of the present invention, it was found that the prior art has at least the following problems:

[0004] During the charging process of electric vehicle batteries, methods such as increasing the speed of cooling fans to improve battery cooling efficiency often result in energy waste. Summary of the Invention

[0005] This application provides a method, device, vehicle, and storage medium for controlling the temperature of an electric vehicle battery, in order to solve the problem of energy waste in battery cooling schemes during electric vehicle charging.

[0006] In a first aspect, embodiments of this application provide a method for controlling the temperature of an electric vehicle battery. The vehicle includes: an air conditioning indirect coolant circuit and a battery indirect coolant circuit; the coolants in the air conditioning indirect coolant circuit and the battery indirect coolant circuit exchange heat through an indirect heat exchanger; the method includes:

[0007] When the vehicle is in charging mode and the air conditioning system is in heating mode, the battery temperature and the outside ambient temperature are obtained.

[0008] When the ambient temperature outside the vehicle is less than or equal to the ambient temperature threshold and the battery temperature is greater than the first battery temperature threshold, the operating state of the battery indirect coolant circuit is adjusted to improve the heat exchange efficiency with the air conditioning indirect coolant circuit, and a battery passive cooling command is sent to the air conditioning system controller to instruct the air conditioning system controller to adjust the state of the air conditioning indirect coolant circuit and the battery indirect coolant circuit for heat exchange according to the battery passive cooling command.

[0009] In one possible implementation, adjusting the operating state of the battery indirect coolant circuit includes: closing the air intake grille, starting the cooling water pump, opening the cooling control valve, and turning off the cooling fan; adjusting the state of the air conditioning indirect coolant circuit includes: starting the heater water pump, starting the air conditioning blower, and adjusting the proportional damper opening.

[0010] In one possible implementation, the battery passive cooling command includes at least a target battery temperature value;

[0011] The adjustment of the air conditioning indirect coolant circuit status also includes:

[0012] Adjust one or more of the following based on the target battery temperature value: air conditioner blower speed, heater pump flow rate, and proportional damper opening.

[0013] In one possible implementation, the method further includes:

[0014] Get the real-time remaining battery power (State of Charge, SOC);

[0015] The cooling level is determined based on the real-time battery SOC, and a passive cooling command for the battery is generated based on the cooling level.

[0016] Send a passive cooling command to the air conditioning system controller to instruct the air conditioning system controller to adjust one or more of the following according to the cooling level: target speed of the air conditioning blower, target flow rate of the heater pump, and target opening of the proportional damper.

[0017] In one possible implementation, the method further includes:

[0018] Get real-time battery SOC;

[0019] The cooling level is determined based on the real-time battery SOC, and the target flow rate of the cooling water pump and the target opening degree of the cooling control valve are determined based on the cooling level.

[0020] Adjust the cooling water pump flow rate according to the target flow rate of the cooling water pump, and adjust the cooling control valve opening according to the target opening degree of the cooling control valve.

[0021] In one possible implementation, determining the cooling level based on the real-time battery SOC includes:

[0022] If the real-time battery SOC is greater than the preset power threshold, the cooling level is determined to be the first level.

[0023] Otherwise, the cooling level is determined to be the second level; wherein the cooling demand corresponding to the first level is greater than the cooling demand corresponding to the second level.

[0024] In one possible implementation, after sending the battery passive cooling command to the air conditioning system controller, the following is also included:

[0025] Get real-time battery temperature;

[0026] When the real-time battery temperature decreases and is less than or equal to the second battery temperature threshold, the cooling water pump, cooling control valve, and cooling fan are shut down, and a cooling exit command is sent to the air conditioning system controller.

[0027] When the real-time battery temperature rises and exceeds the third battery temperature threshold, the cooling fan and air intake grille are turned on, and an active cooling command is sent to the air conditioning system controller.

[0028] Secondly, this application provides an electric vehicle battery temperature control device, the vehicle including: an air conditioning indirect coolant circuit and a battery indirect coolant circuit; the coolant in the air conditioning indirect coolant circuit and the battery indirect coolant circuit exchanges heat through an indirect heat exchanger; the device includes:

[0029] The acquisition module is used to acquire the battery temperature and the outside ambient temperature when the vehicle is in charging mode and the air conditioning system is in heating mode.

[0030] The adjustment module is used to adjust the operating state of the battery indirect coolant circuit to start heat exchange with the air conditioning indirect coolant circuit when the outside ambient temperature is less than or equal to the ambient temperature threshold and the battery temperature is greater than the first battery temperature threshold.

[0031] The transmitting module is used to send a battery passive cooling command to the air conditioning system controller, so as to instruct the air conditioning system controller to adjust the state of the air conditioning indirect coolant circuit and exchange heat with the battery indirect coolant circuit according to the battery passive cooling command.

[0032] In one possible implementation, adjusting the operating state of the battery indirect coolant circuit includes: closing the air intake grille, starting the cooling water pump, opening the cooling control valve, and turning off the cooling fan; adjusting the state of the air conditioning indirect coolant circuit includes: starting the heater water pump, starting the air conditioning blower, and adjusting the proportional damper opening.

[0033] In one possible implementation, the battery passive cooling command includes at least a target battery temperature value;

[0034] The adjustment of the air conditioning indirect coolant circuit status includes:

[0035] Adjust one or more of the following based on the target battery temperature value: air conditioner blower speed, heater pump flow rate, and proportional damper opening.

[0036] In one possible implementation, the acquisition module is further configured to acquire the real-time battery SOC;

[0037] The device also includes:

[0038] The generation module is used to determine the cooling level based on the real-time battery SOC and generate a passive cooling command for the battery based on the cooling level.

[0039] The sending module is used to send a battery passive cooling command generated according to the cooling level to the air conditioning system controller, so as to guide the air conditioning system controller to adjust one or more of the target speed of the air conditioning blower, the target flow rate of the heater pump and the target opening of the proportional damper according to the cooling level.

[0040] In one possible implementation, the acquisition module is further configured to acquire the real-time battery SOC;

[0041] The adjustment module is further configured to determine the cooling level based on the real-time battery SOC, determine the target flow rate of the cooling water pump and the target opening degree of the cooling control valve based on the cooling level, adjust the cooling water pump flow rate based on the target flow rate of the cooling water pump, and adjust the opening degree of the cooling control valve based on the target opening degree of the cooling control valve.

[0042] In one possible implementation, the acquisition module is further configured to acquire the real-time battery temperature after the sending module sends the battery passive cooling command to the air conditioning system controller;

[0043] The adjustment module is also used to shut down the cooling water pump, cooling control valve and cooling fan when the battery temperature drops and is less than or equal to the second battery temperature threshold. The sending module is also used to send a cooling exit command to the air conditioning system controller.

[0044] When the battery temperature rises and exceeds the third battery temperature threshold, the cooling fan and air intake grille are activated, and an active cooling command is sent to the air conditioning system controller.

[0045] Thirdly, embodiments of this application provide a vehicle including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the method as described in the first aspect or any possible implementation of the first aspect above.

[0046] Fourthly, embodiments of this application provide a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the method as described in the first aspect or any possible implementation of the first aspect.

[0047] This application provides a method, device, vehicle, and storage medium for controlling the temperature of an electric vehicle battery. By acquiring the battery temperature and the ambient temperature outside the vehicle when the vehicle is in charging mode and the air conditioning system is operating in heating mode, the accuracy of battery temperature control is improved by integrating multiple parameters including the overall vehicle status, battery temperature, and ambient temperature. When the ambient temperature outside the vehicle is less than or equal to an ambient temperature threshold, and the battery temperature is greater than a first battery temperature threshold, the operating state of the battery indirect coolant circuit is adjusted to initiate heat exchange with the air conditioning indirect coolant circuit. This reduces the heat exchange between the battery and the external environment in low-temperature environments and increases the heat exchange between the battery indirect coolant circuit and the air conditioning indirect coolant circuit. Furthermore, a passive cooling command for the battery is sent to the air conditioning system controller, instructing the controller to adjust the state of the air conditioning indirect coolant circuit and the battery indirect coolant circuit according to the passive cooling command. This meets the comfort requirements of the passenger compartment, fully utilizes battery heat to heat the passenger compartment, improves energy conversion efficiency and utilization, and simultaneously improves the heating efficiency of the air conditioning system. Attached Figure Description

[0048] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0049] Figure 1 This is an application scenario diagram of an electric vehicle battery temperature control method provided in an embodiment of this application;

[0050] Figure 2 This is a flowchart illustrating the implementation of an electric vehicle battery temperature control method according to an embodiment of this application.

[0051] Figure 3 This is a flowchart illustrating the implementation of an electric vehicle battery temperature control method according to another embodiment of this application;

[0052] Figure 4 This is a schematic diagram of the structure of an electric vehicle battery temperature control device provided in an embodiment of this application;

[0053] Figure 5 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application;

[0054] Figure 6 This is a schematic diagram of the structure of a vehicle provided in one embodiment of this application. Detailed Implementation

[0055] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0056] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0057] Unless otherwise stated, the term "multiple" means two or more. The character " / " indicates that the preceding and following objects are in an "or" relationship. For example, A / B means: A or B. The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or, A and B.

[0058] The terms used in this application are for describing embodiments only and are not intended to limit the claims. As used in the description of embodiments and claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. Similarly, the term “and / or” as used herein means including one or more of the associated listed elements and all possible combinations thereof. Additionally, when used in this application, the terms “comprise” and its variations “comprises” and / or “comprising” refer to the presence of stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof. Without further limitation, an element defined by the phrase “comprising an…” does not exclude the presence of additional identical elements in the process, method, or apparatus that includes said element.

[0059] In this application, each embodiment focuses on describing the differences from other embodiments, and similar or identical parts between embodiments can be referred to mutually. For methods, products, etc., disclosed in the embodiments, if they correspond to the method section disclosed in the embodiments, then the relevant parts can be referred to the description of the method section.

[0060] To make the objectives, technical solutions, and advantages of this application clearer, the following description will be provided in conjunction with the accompanying drawings and specific embodiments.

[0061] Figure 1 This is an application scenario diagram of an electric vehicle battery temperature control method provided in an embodiment of this application. For example... Figure 1 As shown in the dashed boxes on the left and right, the vehicle includes: a battery indirect coolant circuit 1 and an air conditioning indirect coolant circuit 2. The coolant in the air conditioning indirect coolant circuit 2 exchanges heat with the coolant in the battery indirect coolant circuit 1 through an indirect heat exchanger 3.

[0062] The battery indirect coolant circuit 1 includes at least a cooling water pump 11 and a cooling control valve 12 to control the flow rate and pressure of the coolant in the battery indirect coolant circuit 1, thereby achieving heat transfer between the battery 13 and the coolant and transferring the heat from the battery 13 to the passenger compartment. The air conditioning indirect coolant circuit 2 includes a heater pump 21, a heater core 22, and a PTC heater 23. When the heater pump 21 is activated, it transfers the heat from the battery 13 to the heater core 22 and then transfers the heat to the passenger compartment. When the heat is insufficient, the PTC heater 23 is activated to provide auxiliary heating.

[0063] The embodiments of this application are mainly aimed at pure electric vehicles and are applicable to the battery cooling requirements in low-temperature charging environments. On the one hand, it can prevent battery heat from dissipating into the surrounding environment and causing energy waste; on the other hand, it can utilize battery heat for passenger compartment heating, reducing the energy consumption of the vehicle's air conditioning system and improving charging efficiency.

[0064] Figure 2 This is a flowchart illustrating the implementation of an electric vehicle battery temperature control method according to an embodiment of this application. Figure 2 As shown, the method includes the following steps:

[0065] S201 acquires the battery temperature and the outside ambient temperature when the vehicle is in charging mode and the air conditioning system is in heating mode.

[0066] The implementation entity in this application is the vehicle control unit (VCU). By having the VCU comprehensively manage the overall vehicle status for battery cooling control, control efficiency can be improved. Specifically, the overall vehicle status includes information such as vehicle charging status, the operating status of various components, the air conditioning system status, and battery charge level.

[0067] The VCU obtains the battery temperature from the Battery Management System (BMS) and the ambient temperature from the air conditioning system controller or other temperature detection devices.

[0068] S202, when the ambient temperature outside the vehicle is less than or equal to the ambient temperature threshold and the battery temperature is greater than the first battery temperature threshold, adjust the operating state of the battery indirect coolant circuit to start heat exchange with the air conditioning indirect coolant circuit, and send a battery passive cooling command to the air conditioning system controller to instruct the air conditioning system controller to adjust the state of the air conditioning indirect coolant circuit and the battery indirect coolant circuit for heat exchange according to the battery passive cooling command.

[0069] In one possible implementation, adjusting the operating state of the battery indirect coolant circuit includes: closing the air intake grille, starting the cooling water pump, opening the cooling control valve, and turning off the cooling fan; adjusting the state of the air conditioning indirect coolant circuit includes: starting the heater pump, starting the air conditioning blower, and adjusting the proportional damper opening. The air intake grille is an active grille system (AGS).

[0070] In other possible implementations, depending on the different compositions of the battery indirect coolant circuit and the air conditioning indirect coolant circuit, when adjusting the operating state of the battery indirect coolant circuit, one or more of the cooling water pump, cooling control valve, and cooling fan may be adjusted accordingly, or other components in the battery indirect coolant circuit may be adjusted; when adjusting the operating state of the air conditioning indirect coolant circuit, one or more of the heater water pump, cooling air conditioning blower, and proportional damper may be adjusted accordingly, or other components in the air conditioning indirect coolant circuit may be adjusted.

[0071] The ambient temperature threshold is determined based on the operating efficiency of the vehicle's air conditioning system and the rate of temperature rise during battery charging. Different vehicle air conditioning system configurations or vehicle batteries will result in different ambient temperature thresholds.

[0072] When the ambient temperature outside the vehicle is less than or equal to the ambient temperature threshold, the vehicle's heating demand is high. This necessitates ensuring sufficient and large-scale evaporation of the refrigerant in the evaporator to absorb heat, and sufficient and large-scale condensation in the condenser to dissipate heat. Therefore, when the ambient temperature outside the vehicle is less than or equal to the ambient temperature threshold, the low-temperature refrigerant flows to the evaporator. Since the evaporator temperature is lower than the vehicle battery temperature, the heat from the vehicle battery can be used to heat the passenger compartment. Specifically, by disabling the vehicle's AGS (Automatic Heat Suppression System) to prevent heat exchange between the battery and the low-temperature outside environment, and by turning off the cooling fan, starting the coolant pump, and opening the cooling control valve, the amount of heat exchange between the battery and the surrounding environment is reduced, while the amount of heat exchange between the vehicle battery and the evaporator is increased. This improves the refrigerant evaporation efficiency within the evaporator, allowing the air conditioning system compressor to operate at low power consumption to meet the passenger compartment heating needs, thereby reducing the energy consumption of the air conditioning system.

[0073] Given that the air conditioning system of pure electric vehicles relies on electricity to operate, the proposed solution utilizes battery heat to heat the heated cabin, which can reduce the power consumption of the air conditioning system, thereby reducing charging time and improving charging efficiency.

[0074] In a specific embodiment, to prevent the battery indirect coolant circuit from starting during the operation of the air conditioning system, which would cause the battery heat to be transferred to the passenger compartment and cause the interior temperature to rise beyond the user's needs, the operating status of the air conditioning system can also be adjusted accordingly.

[0075] In this embodiment, by acquiring the battery temperature and the outside ambient temperature when the vehicle is in charging mode and the air conditioning system is operating in heating mode, the accuracy of battery temperature control is improved by comprehensively considering multiple parameters including the overall vehicle status, battery temperature, and outside ambient temperature. When the outside ambient temperature is less than or equal to an ambient temperature threshold and the battery temperature is greater than a first battery temperature threshold, the operating state of the battery indirect coolant circuit is adjusted to initiate heat exchange with the air conditioning indirect coolant circuit, and the vehicle's AGS is turned off. This reduces the heat exchange between the battery and the external environment in low-temperature conditions, increasing the heat exchange between the battery indirect coolant circuit and the air conditioning indirect coolant circuit. Additionally, a passive battery cooling command is sent to the air conditioning system controller, instructing the controller to adjust the state of the air conditioning indirect coolant circuit and the battery indirect coolant circuit according to the passive battery cooling command. This meets the comfort requirements of the passenger compartment, fully utilizes battery heat to heat the passenger compartment, improves energy conversion efficiency and utilization, and simultaneously enhances the heating efficiency of the air conditioning system.

[0076] In one possible implementation, the battery passive cooling command includes at least a target battery temperature value;

[0077] Adjusting the status of the air conditioning indirect coolant circuit also includes:

[0078] Adjust one or more of the following based on the target battery temperature: air conditioner blower speed, heater pump flow rate, and proportional damper opening.

[0079] In this embodiment, the battery passive cooling command is used to instruct the air conditioning system controller to change the air conditioning operating state to adapt to the heating needs of the passenger compartment and improve the user's riding comfort. Specifically, the air conditioning system controller controls one or more of the following based on the outside ambient temperature, the heating needs of the passenger compartment, and the battery temperature: air conditioning blower speed, heater pump flow rate, and proportional damper opening, to improve heating efficiency.

[0080] In one possible implementation, the method further includes:

[0081] Get real-time battery SOC;

[0082] The cooling level is determined based on the real-time battery SOC, and a passive battery cooling command is generated based on the cooling level.

[0083] Send a passive battery cooling command to the air conditioning system controller to instruct the controller to adjust one or more of the following parameters based on the cooling level: target speed of the air conditioning blower, target flow rate of the heater pump, and target opening of the proportional damper.

[0084] In the specific implementation process, the real-time battery SOC is obtained, and the cooling level is determined based on the real-time battery SOC. This is performed before adjusting the operating state of the battery indirect coolant circuit in step S202, or both before and after adjusting the operating state of the battery indirect coolant circuit in step S202. The VCU obtains the battery temperature from the BMS.

[0085] In addition, during the charging process of electric vehicle batteries, the charging rate varies within different State of Charge (SOC) ranges, resulting in different amounts of heat generation. As the SOC increases, the heat generation gradually increases. Therefore, the lower the battery SOC value, the higher the required cooling capacity and the higher the corresponding cooling level.

[0086] In this embodiment, the cooling level is determined based on the battery SOC, and then a passive cooling command for the battery is generated based on the cooling level to instruct the air conditioning system controller to adjust the operating state of the air conditioning system to make full use of the battery heat and improve heating efficiency.

[0087] In one possible implementation, the method further includes:

[0088] Get real-time battery SOC;

[0089] The cooling level is determined based on the real-time battery SOC, and the target flow rate of the cooling water pump and the target opening of the cooling control valve are determined based on the cooling level.

[0090] Adjust the cooling water pump flow rate according to the target flow rate of the cooling water pump, and adjust the cooling control valve opening according to the target opening degree of the cooling control valve.

[0091] Among them, the lower the battery SOC, the higher the cooling level, and the greater the target flow rate of the cooling water pump and the opening degree of the cooling control valve.

[0092] In step S202, when the ambient temperature outside the vehicle is less than or equal to the ambient temperature threshold and the battery temperature is greater than the first battery temperature threshold, the cooling fan and AGS are turned off to reduce the heat transfer efficiency between the battery and the surrounding environment, resulting in a slower battery cooling rate. If the battery SOC is low and the heat generation is high, adjusting the cooling water pump to operate at a higher flow rate and adjusting the cooling control valve to operate at a larger opening can improve the heat exchange efficiency between the battery indirect coolant circuit and the air conditioning indirect coolant circuit, thereby meeting the battery cooling requirements.

[0093] As the charging process continues, the battery's SOC increases, and the corresponding heat generation decreases. Adjusting the cooling water pump to operate at a lower flow rate and adjusting the cooling control valve to operate at a smaller opening can ensure the battery temperature at the end of charging, preventing the temperature from being too low and thus failing to complete the charging process.

[0094] In this embodiment, the cooling level is determined based on the battery's SOC, and then the target flow rate of the cooling water pump and the opening degree of the cooling control valve are determined based on the cooling level. This can meet the battery's cooling requirements while ensuring the battery temperature at the end of charging, thus avoiding the inability to fully complete charging due to excessively low temperature.

[0095] In one possible implementation, determining the cooling level based on the battery's state of charge (SOC) includes:

[0096] If the battery SOC is greater than the preset power threshold, the cooling level is determined to be the first level.

[0097] Otherwise, the cooling level is determined to be the second level; where the cooling requirement corresponding to the first level is greater than the cooling requirement corresponding to the second level.

[0098] In this embodiment, the cooling level is divided into two levels to reduce the frequency of changes in the operating status of the air conditioning system and avoid the continuous fluctuation of the temperature inside the passenger compartment from affecting the user's riding experience.

[0099] In one possible implementation, after disabling the vehicle AGS and sending a passive battery cooling command to the air conditioning system controller in step S202, the method further includes:

[0100] Get real-time battery temperature;

[0101] When the real-time battery temperature decreases and is less than or equal to the second battery temperature threshold, the cooling water pump, cooling control valve, and cooling fan are shut down, and a cooling exit command is sent to the air conditioning system controller.

[0102] When the real-time battery temperature rises and exceeds the third battery temperature threshold, the cooling fan and AGS are activated, and an active cooling command is sent to the air conditioning system controller.

[0103] Depending on the ambient temperature outside the vehicle, the user-set air conditioning system temperature, etc., after adjusting the operating state of the battery indirect coolant circuit and turning off the vehicle AGS in step S202, the battery temperature will decrease or increase. According to different changes, a corresponding control scheme needs to be generated to adapt to the changes in battery temperature requirements.

[0104] When the battery temperature drops to less than or equal to the second battery temperature threshold, it is necessary to reduce the heat exchange between the battery and the external environment and the air conditioning indirect coolant circuit. Specifically, this is done by shutting down the cooling water pump, cooling control valve and cooling fan to avoid continuously reducing the battery charging efficiency. A cooling exit command is then sent to the air conditioning system controller to instruct the air conditioning system to control the temperature inside the passenger compartment according to the conventional heating control scheme.

[0105] When the battery temperature rises and exceeds the third battery temperature threshold, it is necessary to increase the heat exchange between the battery and the external environment and the air conditioning indirect coolant circuit. Specifically, this is done by turning on the cooling fan and AGS to prevent the temperature from rising continuously, and sending an active cooling command to the air conditioning system controller to instruct the air conditioning system to adjust the overall temperature and control the temperature inside the passenger compartment based on the battery cooling requirements.

[0106] In this embodiment, a control scheme is specifically designed based on the two changes in battery temperature during the charging process: an increase and a decrease, in order to meet both the heating needs of the passenger compartment and the cooling needs of the battery.

[0107] Figure 3 This is a flowchart illustrating the implementation of an electric vehicle battery temperature control method according to another embodiment of this application, as shown below. Figure 3 As shown, the method includes the following steps:

[0108] S301. The vehicle charging gun has been successfully connected and the setup is complete.

[0109] S302, Component status judgment; if charging cannot be performed, proceed to step S303; if charging has started, proceed to step S304.

[0110] S303, Troubleshoot charging issues;

[0111] S304. Determine whether the vehicle is in a charging state; if not, proceed to step S305; otherwise, proceed to step S306.

[0112] S305, Implement cooling strategies for other vehicle conditions;

[0113] S306. Determine whether the passenger compartment heating is turned on, that is, determine whether the vehicle air conditioning system is in heating mode; if the passenger compartment heating is turned on, proceed to step S307.

[0114] S307. Determine whether the ambient temperature outside the vehicle is less than or equal to the ambient temperature threshold T; if it is less than, proceed to step S08; otherwise, proceed to step S310.

[0115] S308. Determine whether the current battery temperature is greater than the first battery temperature threshold Tmax1; if it is, proceed to step S309; ​​otherwise, proceed to step S310.

[0116] S309, Battery passive cooling function activated; specifically including:

[0117] The VCU controls the AGS and cooling fan to shut down, and controls the cooling water pump to run, transferring battery heat to the heater core; the air conditioning system controller adjusts the operation of the air conditioning blower and the opening of the proportional damper, transferring heat to the passenger compartment to heat the passenger compartment.

[0118] After step S309, the battery temperature is detected to monitor changes in battery state. When the battery temperature drops to the second battery temperature threshold Tmax2, step S301 is executed; when the battery temperature rises to the third battery temperature threshold Tmax3, step S311 is executed.

[0119] S310, passive battery cooling function deactivated; specifically including:

[0120] The VCU controls the AGS, cooling fan, cooling water pump, and cooling control valve to shut down; the air conditioning system controller adjusts the proportional damper.

[0121] S311, Active battery cooling function activated.

[0122] In the specific implementation process, after the battery passive cooling function is activated, the cooling level is determined based on the battery SOC, and the operating status of the air conditioning indirect coolant circuit and the battery indirect coolant circuit is adjusted based on the cooling level to adapt to the battery cooling rate.

[0123] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0124] The following are device embodiments of this application. For details not described in detail, please refer to the corresponding method embodiments described above.

[0125] Figure 4 This is a schematic diagram of the structure of an electric vehicle battery temperature control device according to an embodiment of this application, as shown below. Figure 4 As shown, for ease of explanation, only the parts related to the embodiments of this application are shown, such as... Figure 4 As shown, the device includes:

[0126] The acquisition module 401 is used to acquire the battery temperature and the outside ambient temperature when the vehicle is in charging mode and the air conditioning system is in heating mode.

[0127] The adjustment module 402 is used to adjust the operating state of the battery indirect coolant circuit when the ambient temperature outside the vehicle is less than or equal to the ambient temperature threshold and the battery temperature is greater than the first battery temperature threshold, so as to start heat exchange with the air conditioning indirect coolant circuit and turn off the vehicle AGS.

[0128] The sending module 403 is used to send a battery passive cooling command to the air conditioning system controller, so as to instruct the air conditioning system controller to adjust the state of the air conditioning indirect coolant circuit and the battery indirect coolant circuit for heat exchange according to the battery passive cooling command.

[0129] In one possible implementation, adjusting the operating state of the battery indirect coolant circuit includes: starting the cooling water pump, opening the cooling control valve, and turning off the cooling fan; adjusting the state of the air conditioning indirect coolant circuit includes: starting the heater water pump, starting the air conditioning blower, and adjusting the proportional damper opening.

[0130] In one possible implementation, the battery passive cooling command includes at least a target battery temperature value;

[0131] Adjusting the status of the air conditioning indirect coolant circuit also includes:

[0132] Adjust one or more of the following based on the target battery temperature: air conditioner blower speed, heater pump flow rate, and proportional damper opening.

[0133] In one possible implementation, the acquisition module 401 is also used to acquire the real-time battery SOC;

[0134] The device also includes:

[0135] The generation module is used to determine the cooling level based on the real-time battery SOC and generate passive cooling instructions for the battery based on the cooling level.

[0136] The sending module 403 is used to send a battery passive cooling command generated according to the cooling level to the air conditioning system controller, so as to guide the air conditioning system controller to adjust one or more of the target speed of the air conditioning blower, the target flow rate of the heater pump and the target opening of the proportional damper according to the cooling level.

[0137] In one possible implementation, the acquisition module 401 is also used to acquire the real-time battery SOC;

[0138] The adjustment module 402 is also used to determine the cooling level based on the real-time battery SOC, and to determine the target flow rate of the cooling water pump and the target opening degree of the cooling control valve based on the cooling level, and to adjust the cooling water pump flow rate based on the target flow rate of the cooling water pump, and to adjust the opening degree of the cooling control valve based on the target opening degree of the cooling control valve.

[0139] In one possible implementation, the acquisition module 401 is also used to acquire the real-time battery temperature after the sending module 403 sends the battery passive cooling command to the air conditioning system controller.

[0140] The adjustment module 402 is further configured to shut down the cooling water pump, cooling control valve, and cooling fan when the battery temperature decreases and is less than or equal to the second battery temperature threshold; and to turn on the cooling fan and AGS when the battery temperature increases and exceeds the third battery temperature threshold, and send a passive cooling exit command to the air conditioning system controller. The sending module is further configured to send a cooling exit command to the air conditioning system controller when the battery temperature decreases and is less than or equal to the second battery temperature threshold; and to send an active cooling command to the air conditioning system controller when the battery temperature increases and exceeds the third battery temperature threshold.

[0141] In this embodiment, by acquiring the battery temperature and the outside ambient temperature when the vehicle is in charging mode and the air conditioning system is operating in heating mode, the accuracy of battery temperature control is improved by comprehensively considering multiple parameters including the overall vehicle status, battery temperature, and outside ambient temperature. When the outside ambient temperature is less than or equal to an ambient temperature threshold and the battery temperature is greater than a first battery temperature threshold, the operating state of the battery indirect coolant circuit is adjusted to initiate heat exchange with the air conditioning indirect coolant circuit, and the vehicle's AGS is turned off. This reduces the heat exchange between the battery and the external environment in low-temperature conditions, increasing the heat exchange between the battery indirect coolant circuit and the air conditioning indirect coolant circuit. Additionally, a passive battery cooling command is sent to the air conditioning system controller, instructing the controller to adjust the state of the air conditioning indirect coolant circuit and the battery indirect coolant circuit according to the passive battery cooling command. This meets the comfort requirements of the passenger compartment, fully utilizes battery heat to heat the passenger compartment, improves energy conversion efficiency and utilization, and simultaneously enhances the heating efficiency of the air conditioning system.

[0142] Figure 5 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. For example... Figure 5 As shown, the electronic device 5 in this embodiment includes: a processor 50, a memory 51, and a computer program 52 stored in the memory 51 and executable on the processor 50. When the processor 50 executes the computer program 52, it implements the steps in the various embodiments of the electric vehicle battery temperature control method described above, for example... Figure 2 Steps S201 to S202 are shown. Alternatively, when the processor 50 executes the computer program 52, it implements the functions of each module / unit in the above-described device embodiments, for example... Figure 4 The functions of each module are shown.

[0143] For example, the computer program 52 can be divided into one or more modules / units, which are stored in the memory 51 and executed by the processor 50 to complete this application. The one or more modules / units can be a series of computer program instruction segments capable of performing a specific function, which describe the execution process of the computer program 52 in the electronic device 5. For example, the computer program 52 can be divided into... Figure 4 The modules shown.

[0144] The electronic device 5 can be a desktop computer, laptop, handheld computer, cloud server, or other computing device. The electronic device 5 may include, but is not limited to, a processor 50 and a memory 51. Those skilled in the art will understand that... Figure 5 This is merely an example of electronic device 5 and does not constitute a limitation on electronic device 5. It may include more or fewer components than shown, or combine certain components, or different components. For example, the electronic device may also include input / output devices, network access devices, buses, etc.

[0145] The processor 50 may be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor.

[0146] The memory 51 can be an internal storage unit of the electronic device 5, such as a hard disk or memory. The memory 51 can also be an external storage device of the electronic device 5, such as a plug-in hard disk, Smart Media Card (SMC), Secure Digital (SD) card, or Flash Card. Furthermore, the memory 51 can include both internal and external storage units of the electronic device 5. The memory 51 is used to store the computer program and other programs and data required by the electronic device. The memory 51 can also be used to temporarily store data that has been output or will be output.

[0147] This application also provides a vehicle, such as... Figure 6 As shown, the vehicle 6 includes the aforementioned electronic equipment 5.

[0148] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0149] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0150] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed in this application can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0151] In the embodiments provided in this application, it should be understood that the disclosed devices / electronic devices and methods can be implemented in other ways. For example, the device / electronic device embodiments described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual couplings or direct couplings or communication connections may be through some interfaces; indirect couplings or communication connections between devices or units may be electrical, mechanical, or other forms.

[0152] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0153] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0154] If the integrated module / unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various electric vehicle battery temperature control method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a portable hard drive, a magnetic disk, an optical disk, a computer memory, a read-only memory (ROM), a random access memory (RAM), an electrical carrier signal, a telecommunication signal, and a software distribution medium, etc.

[0155] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A method for controlling the temperature of an electric vehicle battery, the vehicle comprising: Air conditioning indirect coolant circuit and battery indirect coolant circuit; The air conditioner indirect coolant circuit and the battery indirect coolant circuit exchange heat through an indirect heat exchanger; characterized in that the method includes: When the vehicle is in charging mode and the air conditioning system is in heating mode, the battery temperature and the outside ambient temperature are obtained. When the ambient temperature outside the vehicle is less than or equal to the ambient temperature threshold and the battery temperature is greater than the first battery temperature threshold, the operating state of the battery indirect coolant circuit is adjusted to initiate heat exchange with the air conditioning indirect coolant circuit, and a battery passive cooling command is sent to the air conditioning system controller to instruct the air conditioning system controller to adjust the state of the air conditioning indirect coolant circuit and exchange heat with the battery indirect coolant circuit according to the battery passive cooling command. The adjustment of the battery indirect coolant circuit operation includes: closing the air intake grille, starting the cooling water pump, opening the cooling control valve, and turning off the cooling fan; the adjustment of the air conditioning indirect coolant circuit operation includes: starting the heater water pump, starting the air conditioning blower, and adjusting the proportional damper opening. After sending the battery passive cooling command to the air conditioning system controller, the method further includes: Get real-time battery temperature; When the real-time battery temperature decreases and is less than or equal to the second battery temperature threshold, the cooling water pump, cooling control valve, and cooling fan are shut down, and a cooling exit command is sent to the air conditioning system controller. When the real-time battery temperature rises and exceeds the third battery temperature threshold, the cooling fan and air intake grille are activated, and active cooling is sent to the air conditioning system controller.

2. The method according to claim 1, characterized in that, in, The battery passive cooling command includes at least the target battery temperature value; The adjustment of the air conditioning indirect coolant circuit status includes: Adjust one or more of the following based on the target battery temperature value: air conditioner blower speed, heater pump flow rate, and proportional damper opening.

3. The method according to claim 2, characterized in that, Also includes: Get real-time battery SOC; The cooling level is determined based on the real-time battery SOC, and a passive battery cooling command is generated based on the cooling level. Send a passive cooling command to the air conditioning system controller to instruct the air conditioning system controller to adjust one or more of the following according to the cooling level: target speed of the air conditioning blower, target flow rate of the heater pump, and target opening of the proportional damper.

4. The method according to claim 1, characterized in that, Also includes: Get real-time battery SOC; The cooling level is determined based on the real-time battery SOC, and the target flow rate of the cooling water pump and the target opening degree of the cooling control valve are determined based on the cooling level. Adjust the cooling water pump flow rate according to the target flow rate of the cooling water pump, and adjust the cooling control valve opening according to the target opening degree of the cooling control valve.

5. The method according to claim 3 or 4, characterized in that, The step of determining the cooling level based on the real-time battery SOC includes: If the real-time battery SOC is greater than the preset power threshold, the cooling level is determined to be the first level. Otherwise, the cooling level is determined to be the second level; wherein the cooling demand corresponding to the first level is greater than the cooling demand corresponding to the second level.

6. An electric vehicle battery temperature control device for performing the electric vehicle battery temperature control method according to any one of claims 1 to 5, wherein the vehicle comprises: Air conditioning indirect coolant circuit and battery indirect coolant circuit; The air conditioner indirect coolant circuit and the battery indirect coolant circuit exchange heat through an indirect heat exchanger; characterized in that the device includes: The acquisition module is used to acquire the battery temperature and the outside ambient temperature when the vehicle is in charging mode and the air conditioning system is in heating mode. The adjustment module is used to adjust the operating state of the battery indirect coolant circuit to start heat exchange with the air conditioning indirect coolant circuit when the outside ambient temperature is less than or equal to the ambient temperature threshold and the battery temperature is greater than the first battery temperature threshold. The transmitting module is used to send a battery passive cooling command to the air conditioning system controller, instructing the air conditioning system controller to adjust the state of the air conditioning indirect coolant circuit and exchange heat with the battery indirect coolant circuit according to the battery passive cooling command.

7. A vehicle comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the method as described in any one of claims 1 to 5 above.

8. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method as described in any one of claims 1 to 5 above.

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