Vehicle thermal management method and system, electronic equipment and vehicle

Abstract

The invention provides a vehicle thermal management method and system, electronic equipment and a vehicle, the method is applied to the vehicle thermal management system, the vehicle thermal management system comprises a first cooling device and a second cooling device, and the first cooling device is used for cooling a battery and a contactor; the second cooling device is used for improving the cooling effect of the first cooling device; the method comprises the steps of obtaining a first temperature of a contactor and a second temperature of a battery; when the first temperature is greater than a first preset temperature and / or the second temperature is greater than a second preset temperature, starting a first cooling device; and under the condition that the first temperature is larger than a third preset temperature and / or the second temperature is larger than a fourth preset temperature, the first cooling device and the second cooling device are started, the third preset temperature is larger than the first temperature, and the fourth preset temperature is larger than the second preset temperature. Thermal management of the battery and the contactor can be considered, so that the overload capacity of the contactor is improved.

Description

Technical Field

[0001] The present application relates to the field of vehicle thermal management, and particularly to a vehicle thermal management method, system, electronic device and vehicle. Background Art

[0002] With the rapid development of new energy technologies, electric vehicles have become the main development direction in the future automotive field. Among them, the power battery, as the core component of an electric vehicle, directly determines the driving range, driving experience and service life of the electric vehicle in terms of its performance and lifespan. Thermal management of the power battery and power devices such as contactors in the battery pack is the key to improving battery lifespan and vehicle power performance. In related technologies, only the internal working state of the battery is concerned, and no active thermal management is carried out on the contactors in the battery pack. Since there are no thermal management measures for the contactors, in order to prevent the contactors from overheating, contactors with larger power parameters and larger volumes are preferentially selected, resulting in too high a selection cost for the thermal manager.

[0003] Therefore, the present application proposes a vehicle thermal management method, enabling the contactors to be incorporated into the battery thermal management method, thereby reducing the power parameters of the contactors and increasing the flexibility in selecting contactors. Summary of the Invention

[0004] In view of the above, the present application provides a vehicle thermal management method, system, electronic device and vehicle, which can perform thermal management on both the battery and the contactors simultaneously.

[0005] In a first aspect, an embodiment of the present application provides a vehicle thermal management method, which is applied to a vehicle thermal management system. The vehicle thermal management system is used to cool the battery and the contactors. The battery and the contactors are electrically connected. The vehicle thermal management system includes a first cooling device and a second cooling device. The first cooling device is used to cool the battery and the contactors; the second cooling device is used to improve the cooling effect of the first cooling device; the method includes: obtaining a first temperature of the contactors and a second temperature of the battery; starting the first cooling device when the first temperature is greater than a first preset temperature and / or the second temperature is greater than a second preset temperature; starting the first cooling device and the second cooling device when the first temperature is greater than a third preset temperature and / or the second temperature is greater than a fourth preset temperature, where the third preset temperature is greater than the first preset temperature and the fourth preset temperature is greater than the second preset temperature.

[0006] Compared with the related art, the embodiments of the present application have at least the following advantages: In the related art, the first cooling device and the second cooling device are used to cool the battery, and the contactor does not participate in the vehicle thermal management system of the battery, so the operating temperature of the contactor cannot be reduced. In the present application, the contactor is added to the vehicle thermal management system of the battery, so that the first cooling device and the second cooling device cool the battery and the contactor together, so that the contactor always operates at a lower temperature, improving the overload capacity of the contactor. When the overload capacity of the contactor is improved, the present application can select a contactor with a small volume and a small current for the vehicle, thereby reducing the cost of the contactor and improving the integration possibility of the battery. Secondly, when the cooling requirements of the battery and the contactor are small, the first cooling device is started. When the cooling requirements of the battery and the contactor are large, the first cooling device and the second cooling device are started at the same time, thereby realizing hierarchical processing of the cooling requirements to improve the energy utilization efficiency of the first cooling device and the second cooling device.

[0007] Optionally, the above method further includes: a method for setting the second preset temperature and the fourth preset temperature, including: obtaining the current driving condition of the vehicle and the current charge and discharge strategy of the battery; determining the target operating temperature of the battery based on the driving condition and the charge and discharge strategy; obtaining the first cooling range of the first cooling device and obtaining the second cooling range of the second cooling device; setting the second preset temperature according to the target operating temperature and the first cooling range; setting the fourth preset temperature according to the target operating temperature and the second cooling range.

[0008] Optionally, after starting the first cooling device and not starting the second cooling device, it further includes: determining the first release temperature corresponding to the contactor and the second release temperature corresponding to the battery; closing the first cooling device when the first temperature is less than the first release temperature and the second temperature is less than the second release temperature.

[0009] Optionally, after starting the first cooling device and the second cooling device, it further includes: obtaining the third release temperature corresponding to the contactor and the fourth release temperature corresponding to the battery; closing the second cooling device when the first temperature is less than the third release temperature and the second temperature is less than the fourth release temperature.

[0010] Optionally, after starting the first cooling device and not starting the second cooling device, it further includes: obtaining the third temperature of the first cooling device; starting the second cooling device when the third temperature is greater than the fifth preset temperature.

[0011] Optionally, after starting the second temperature reduction device, the method further includes: obtaining a fifth release temperature corresponding to the first temperature reduction device, a sixth release temperature corresponding to the contactor, and a seventh release temperature corresponding to the battery; and turning off the second temperature reduction device when the first temperature is less than the sixth release temperature, the second temperature is less than the seventh release temperature, and the third temperature is less than the fifth release temperature.

[0012] Optionally, the method further includes: when the first temperature is greater than a sixth preset temperature, limiting the charge and discharge current of the battery within a threshold current range, where the sixth preset temperature is greater than the second preset temperature; and after limiting the charging current of the current within the threshold current range, starting the first temperature reduction device and the second temperature reduction device.

[0013] In a second aspect, the present application provides a vehicle thermal management system. The vehicle thermal management system is used to cool a battery and a contactor, and the battery and the contactor are electrically connected. The vehicle thermal management system includes: a first temperature reduction device, a second temperature reduction device, and a control device. The first temperature reduction device is used to cool the battery and the contactor; the second temperature reduction device is used to improve the temperature reduction effect of the first temperature reduction device; the control device is used to obtain a first temperature of the contactor and a second temperature of the battery; the control device is further used to start the first temperature reduction device when the first temperature is greater than a first preset temperature and / or the second temperature is greater than a second preset temperature; the control device is further used to start the first temperature reduction device and the second temperature reduction device when the first temperature is greater than a third preset temperature and / or the second temperature is greater than a fourth preset temperature, where the third preset temperature is greater than the first preset temperature and the fourth preset temperature is greater than the second preset temperature.

[0014] In a third aspect of the present application, an electronic device is disclosed. The electronic device includes a processor and a memory. The memory is used to store instructions, and the processor is used to call the instructions in the memory so that the electronic device executes the above-mentioned vehicle thermal management method.

[0015] In a fourth aspect of the present application, a vehicle is disclosed, including: the above-mentioned vehicle thermal management system.

[0016] It can be understood that the vehicle in the second aspect, the electronic device in the third aspect, and the vehicle in the fourth aspect provided above all correspond to the method in the first aspect. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects in the corresponding method provided above, and will not be elaborated here. Description of the Drawings

[0017] Figure 1 is a schematic connection diagram of a first temperature reduction device and a second temperature reduction device according to an embodiment of the present application.

[0018] Figure 2 is a schematic flowchart of a vehicle thermal management method according to an embodiment of the present application.

[0019] Figure 3 It is a schematic flow chart of a vehicle thermal management method according to another embodiment of the present application.

[0020] Figure 4 Schematic flow chart of a vehicle thermal management method according to another embodiment of the present application.

[0021] Figure 5 It is a schematic diagram of the functional modules of a vehicle thermal management system according to an embodiment of the present application.

[0022] Figure 6 It is a schematic structural diagram of an electronic device according to an embodiment of the present application. Detailed implementation manners

[0023] In order to be able to more clearly understand the above objects, features and advantages of the present application, the present application will be described in detail below in conjunction with the accompanying drawings and specific implementation manners. It should be noted that, without conflict, the implementation manners of the present application and the features in the implementation manners can be combined with each other.

[0024] Many specific details are set forth in the following description in order to fully understand the present application. The described implementation manners are only a part of the implementation manners of the present application, rather than all of the implementation manners.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs. The terms used in the specification of the present application herein are only for the purpose of describing specific implementation manners, and are not intended to limit the present application.

[0026] Further, it should be noted that in this article, the term "comprising", "including" or any other variant thereof is intended to cover a non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including that element.

[0027] In this application, "at least one" means one or more, and "a plurality" means two or more than two. "And / or" describes the relationship between associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone, where A and B can be singular or plural. The terms "first", "second", "third", "fourth", etc. (if any) in the specification, claims, and drawings of this application are used to distinguish similar objects, rather than to describe a specific order or sequence.

[0028] In the embodiments of this application, words such as "exemplary" or "for example" are used to give examples, illustrations, or explanations. Any embodiment or design solution described as "exemplary" or "for example" in the embodiments of this application should not be construed as more preferred or more advantageous than other embodiments or design solutions. Rather, the use of words such as "exemplary" or "for example" is intended to present relevant concepts in a specific manner.

[0029] The battery is used to provide energy for vehicle activities such as starting, lighting, and electronic systems of the vehicle. The battery is used to store energy so that various devices in the vehicle can still be powered when the engine is turned off. At the same time, the battery provides a strong current during starting to ensure that the engine can start smoothly. To ensure the normal operation of the battery, it is necessary to ensure that the operating temperature of the battery is always below the safe temperature. When the operating temperature of the battery exceeds the safe temperature, it is necessary to start the vehicle thermal management system in time to cool down the battery. The contactor is used to control the on / off of the current and can switch high-current circuits. The contactor can automatically disconnect the circuit when the current is too large to protect the circuit and equipment. The contactor generates heat during operation and needs to be cooled down in an effective way to ensure the normal operation of the contactor and extend its service life.

[0030] This application provides a vehicle thermal management method, which is applied to a vehicle thermal management system. The vehicle thermal management system is used to cool down the battery and the contactor, and the battery and the contactor are electrically connected. The vehicle thermal management system includes a first cooling device and a second cooling device. The first cooling device is used to cool down the battery and the contactor, and the second cooling device is used to improve the cooling effect of the first cooling device. The first cooling device and the second cooling device jointly cool down the battery and the contactor.

[0031] In one embodiment, as Figure 1 shown, the vehicle thermal management system includes: a first cooling device (the first cooling device includes a circulating liquid pump 110 and a liquid cooling plate 120), a second cooling device 200. The first cooling device and the second cooling device 200 jointly cool down the battery 300 and the contactor ( Figure 1 in which the contactor includes a first contactor 410 and a contactor 420). The second cooling device 200 includes refrigeration devices such as a compressor, a heat exchanger, and a fan (not shown). AsFigure 1 The first cooling device and the second cooling device 200 shown are connected by a cooling circuit L1, and the cooling circuit L1 is also connected to the battery 300 and the contactor respectively. The liquid cooling plate 120 usually needs to work together with the circulating liquid pump 110 to effectively cool the battery. The liquid cooling plate 120 absorbs and dissipates heat through the heat sink and the liquid (such as water or coolant), while the circulating liquid pump 110 is responsible for conducting the heat into the liquid in the liquid cooling plate 120. By making the coolant (the coolant includes freon, etc.) flow in the cooling circuit L1, the coolant exchanges heat with the device to be cooled to absorb the heat of the battery and / or the contactor.

[0032] There are multiple cooling channels inside the liquid cooling plate 120, and the coolant (such as water or antifreeze) circulates in these channels. The heat generated during the operation of the device is conducted to the surface of the liquid cooling plate through contact. The liquid cooling plate is usually made of a material with excellent thermal conductivity, such as aluminum or copper, so as to effectively conduct heat. When the coolant flows in the liquid cooling plate, it absorbs the heat conducted from the plate surface, causing the temperature of the coolant to rise. The heated coolant continues to circulate in the liquid cooling plate, taking away the absorbed heat, and usually flows to the radiator or heat exchanger for cooling treatment. In the radiator or heat exchanger, the heat of the coolant is released to the environment, and after the coolant temperature drops, it continues to circulate back to the liquid cooling plate to complete a complete cooling cycle.

[0033] While the first cooling device is cooling through the refrigerator, the second cooling device 200 can be started to enhance the cooling effect of the first cooling device. The second cooling device 200 includes refrigeration devices such as a compressor, a heat exchanger, a fan, and a condenser. For example, the second cooling device 200 compresses the coolant to a high-pressure state in the compressor, and then the coolant flows through the condenser. In the condenser, the heat of the coolant is dissipated to the external environment, and the coolant solidifies during this process. Then, the coolant flows through the heat exchanger and absorbs the heat of the external environment again, thus completing sequential cooling. Finally, the coolant returns to the compressor and continues to circulate in the cooling circuit to take away the heat of the device to be cooled.

[0034] It should be noted that in the related art, although there is an electrical connection relationship between the battery and the contactor, the battery and the contactor are independently encapsulated in the battery pack, and the battery is connected to the third cooling device. In this application, a section of the liquid cooling plate of the first cooling device extends towards the contactor so that the battery and the contactor share a vehicle thermal management system, that is Figure 1 the battery 300, the first contactor 410, and the second contactor 420 in it jointly contact a liquid cooling plate 120. Due to sharing a liquid cooling plate 120, and the cooling circuit L1 of the first cooling device (the circulating liquid pump 110 and the liquid cooling plate 120) is connected to the second cooling device 200, the battery 300, the first contactor 410, and the second contactor 420 are jointly connected to the cooling circuit L1.

[0035] When the cooling demand is small, the first cooling device is used to take away the heat of the battery pack and the contactor. When the cooling demand is large, the second cooling device is turned on to further take away the heat of the battery pack and the contactor, so as to ensure the stable operation of the battery and the contactor at a safe temperature.

[0036] As Figure 2 shown, the present application provides a vehicle thermal management method, which includes: Step 110, obtaining the first temperature of the contactor and the second temperature of the battery.

[0037] The contactor is used to control the battery switch. Usually, the number of contactors is two, and the two contactors are respectively used to control the positive and negative poles of the battery. When obtaining the first temperature of the contactor respectively, as long as the first temperature of one contactor triggers the cooling demand, the first cooling device or the second cooling device can be started. The second temperature can be the average temperature of all battery cells in the battery, or the battery pack temperature directly collected by the battery management system.

[0038] Step 120, starting the first cooling device when the first temperature is greater than the first preset temperature and / or the second temperature is greater than the second preset temperature.

[0039] The contactor and the battery can respectively trigger the start of the first cooling device, or jointly trigger the start of the first cooling device.

[0040] For example, when the first temperature is greater than the first preset temperature and the second temperature is not greater than the second preset temperature, it is determined that the contactor has a demand to start the first cooling device, and the battery has no cooling demand. At this time, the first cooling device is triggered to cool the contactor, and at the same time, the first cooling device also cools the battery.

[0041] For example, when the first temperature is not greater than the first preset temperature and the second temperature is greater than the second preset temperature, at this time, the contactor has no demand to start the first cooling device, and the battery has a demand to start the first cooling device. At this time, the first cooling device is triggered to cool the battery, and at the same time, the first cooling device also cools the contactor.

[0042] For example, when the first temperature is greater than the first preset temperature and the second temperature is greater than the second preset temperature, both the battery and the contactor have a demand to start the first cooling device. At this time, the first cooling device is triggered to cool the contactor and the battery together.

[0043] In one embodiment, the starting condition of the first cooling device, in addition to the first temperature being greater than the first preset temperature, further includes: the time when the first temperature is greater than the first preset temperature exceeds a preset time interval. By setting the preset time interval, false triggering of the first cooling device is reduced. For example, the first preset temperature is 70 °C and the preset time interval is 5 seconds. When the time interval during which the first temperature of any contactor exceeds 70 °C exceeds 5 seconds, the first cooling device is started.

[0044] Step 130, when the first temperature is greater than the third preset temperature, and / or the second temperature is greater than the fourth preset temperature, start the first cooling device and the second cooling device, where the third preset temperature is greater than the first preset temperature and the fourth preset temperature is greater than the second preset temperature.

[0045] The second cooling device can be started after the first cooling device is started, or can be started simultaneously with the first cooling device. The contactor and the battery can respectively trigger the start of the first cooling device and the second cooling device, or can jointly trigger the start of the first cooling device and the second cooling device.

[0046] For example, when the first temperature is greater than the third preset temperature and the second temperature is not greater than the fourth preset temperature, the contactor has a requirement to start the first cooling device and the second cooling device, and the battery has no requirement to start the second cooling device. At this time, the cooling requirement of the battery is empty, or the cooling requirement of the battery is to start the first cooling device. Since the cooling effect of the second cooling device is greater than that of the first cooling device, when the contactor has a requirement for the second cooling device, the second cooling device can fully cover the requirement of the battery to start the first cooling device.

[0047] For example, when the first temperature is not greater than the third preset temperature and the second temperature is greater than the fourth preset temperature, the contactor has no requirement to start the second cooling device, and the battery has a requirement to start the first cooling device and the second cooling device. At this time, the cooling requirement of the contactor is empty, or the cooling requirement of the contactor is to start the first cooling device. Since the cooling effect of the second cooling device is greater than that of the first cooling device, when the battery has a requirement to start the second cooling device, the cooling effect of the second cooling device can fully cover the cooling requirement of the contactor.

[0048] For example, when the first temperature is greater than the third preset temperature and the second temperature is greater than the fourth preset temperature, both the battery and the contactor have a requirement to start the first cooling device and the second cooling device, then the first cooling device and the second cooling device are jointly started.

[0049] In one embodiment, the starting condition of the second cooling device, in addition to the first temperature being greater than the third preset temperature, further includes: the time when the first temperature is greater than the third preset temperature exceeds a preset time interval, so as to reduce the misoperation of the second cooling device. For example, the third preset temperature is 85 degrees Celsius and the preset time interval is 5 seconds. When the time interval during which the first temperature of any contactor exceeds 85 degrees Celsius exceeds 5 seconds, the second cooling device is started.

[0050] In one embodiment, the vehicle thermal management method of the present application further includes: a method for setting the second preset temperature and the fourth preset temperature.

[0051] According to the above content, the cooling requirement of the contactor is a three-level management strategy. When the first temperature is not higher than the first preset temperature, the cooling requirement of the contactor is empty. When the first temperature is higher than the first preset temperature, the cooling requirement of the contactor is to start the first cooling device. When the first temperature is higher than the second preset temperature, the cooling requirement of the contactor is to start the first cooling device and the second cooling device.

[0052] Due to the complex thermal management strategy of the battery, in order to cooperate with the three-level thermal management requirement of the contactor, it is necessary to simplify the existing complex battery thermal management strategy of the battery into a three-level thermal management strategy of the battery, so as to facilitate the combination with the contactor strategy, so that the battery and the contactor jointly start the first cooling device and / or the second cooling device during operation. Specifically, the three-level thermal management strategy of the battery is determined through the second preset temperature and the fourth preset temperature. When the second temperature is higher than the second preset temperature, the cooling requirement of the battery is to start the first cooling device. When the second temperature is higher than the fourth preset temperature, the cooling requirement of the battery is to start the first cooling device and the second cooling device.

[0053] Optionally, the method for setting the second preset temperature and the fourth preset temperature includes: obtaining the current driving condition of the vehicle and the current charge and discharge strategy of the battery; determining the target operating temperature of the battery based on the driving condition and the charge and discharge strategy; obtaining the first cooling amplitude of the first cooling device and the second cooling amplitude of the second cooling device; setting the second preset temperature according to the target operating temperature and the first cooling amplitude; setting the fourth preset temperature according to the target operating temperature and the second cooling amplitude.

[0054] In this example, by combining the current driving condition of the vehicle and the current charge and discharge strategy of the battery, the second preset temperature and the fourth preset temperature of the battery at each moment are determined, so as to facilitate the three-level management strategy of the battery. Among them, the target operating temperature is the battery temperature that can enable the battery to operate safely under the current working condition.

[0055] In one embodiment, the driving conditions of the vehicle at least include: normal driving, fast charging, high-temperature environment, high-load use, cooling after parking, or several of the first types.

[0056] Among them, during normal driving, heat is generated by the battery during normal driving of the vehicle. At this time, the target operating temperature is the safe temperature of the battery during normal driving. During the fast charging process of the vehicle, a large amount of heat is generated by the battery. At this time, the target operating temperature is the safe temperature of the battery during fast charging. When driving in a high-temperature environment, the target operating temperature at this time is the safe temperature of the battery in the high-temperature environment. In high-load use scenarios, such as long-term high-speed driving or climbing, the battery generates more heat. At this time, the target operating temperature of the battery is the safe operating temperature of the battery in the high-temperature scenario. After the vehicle stops, the battery may still have residual heat, and the cooling system will continue to work for a period of time to help the battery cool down and prevent heat accumulation. At this time, the target operating temperature of the battery is the temperature of the battery after cooling.

[0057] The first cooling range is the maximum cooling temperature of the first cooling device, and the second cooling range is the maximum cooling temperature of the second cooling device. By calculating the sum of the target operating temperature and the first cooling range in real time, a second preset temperature is generated; by calculating the sum of the target operating temperature and the second cooling range value in real time, a fourth preset temperature is generated.

[0058] It should be noted that since the second preset temperature and the fourth preset temperature are both generated in real time, all the second preset temperatures that can trigger the first cooling device can be classified as the first type of trigger condition, and all the fourth preset temperatures that can trigger the second cooling device can be classified as the second type of trigger condition. As long as the second temperature triggers any condition in the first type of trigger condition, the first cooling device can be started. As long as the second temperature triggers any condition in the second type of trigger condition, the second cooling device can be started.

[0059] In some specific embodiments, the first type of trigger condition includes: starting the first cooling device when the battery temperature during driving is less than 10 degrees, or starting the second cooling device when the charging temperature is less than 70 degrees. The second type of trigger condition includes: starting the first cooling device and the second cooling device when the battery temperature during driving is greater than 20 degrees, or starting the first cooling device and the second cooling device when the charging is greater than 85 degrees.

[0060] In one embodiment, as Figure 3 shown, after step 120 starts the first cooling device and does not start the second cooling device, it further includes: Step 121, determining the first release temperature corresponding to the contactor and the second release temperature corresponding to the battery.

[0061] Step 122, when the first temperature is less than the first release temperature and the second temperature is less than the second release temperature, turn off the first cooling device.

[0062] In one embodiment, in addition to the first temperature being less than the first release temperature, the exit condition of the first cooling device further includes: the time when the first temperature is less than the first release temperature exceeds a preset time interval, so as to reduce the premature release of the cooling mode of the first cooling device. For example, the first release temperature is 65 degrees Celsius and the preset time interval is 5 seconds. When the time interval during which the first temperature of any contactor is less than 65 degrees Celsius exceeds 5 seconds, start the first cooling device.

[0063] In one embodiment, as Figure 4 shown, after step 130 starts the first cooling device and the second cooling device, it further includes: Step 131, obtain the third release temperature corresponding to the contactor and the fourth release temperature corresponding to the battery.

[0064] Step 132, when the first temperature is less than the third release temperature and the second temperature is less than the fourth release temperature, turn off the second cooling device.

[0065] In one embodiment, in addition to the first temperature being less than the third release temperature, the exit condition of the second cooling device further includes: the time interval during which the first temperature is less than the third release temperature exceeds a preset time interval, so as to reduce the premature release of the cooling effect of the second cooling device. For example, the third release temperature is 80 degrees Celsius and the preset time interval is 5 seconds. When the time interval during which the first temperature of any contactor is less than 85 degrees Celsius exceeds 5 seconds, start the second cooling device.

[0066] The first release temperature is the temperature at which the contactor operates normally, and the third release temperature is the temperature for releasing the second cooling device. The third release temperature is greater than the first release temperature. Through the first release temperature and the third release temperature, a three-level management strategy for the contactor to release the first cooling device and the second cooling device is generated. Combining the above three-level management strategy for the contactor to start the first cooling device and the second cooling device, Table 1 is generated. As shown in Table 1, the entry condition for the contactor to enter the first cooling device is Condition A, the exit condition of the first cooling device is Condition B, the entry condition for the first cooling device and the second cooling device is Condition C, and the exit condition for the first cooling device and the second cooling device is Condition D. Among them, Condition A: the temperature of any contactor is greater than the first preset temperature, Condition B: the temperature of all contactors is less than the first release temperature, Condition C: the temperature of any contactor is greater than the third preset temperature, Condition D: the temperature of all contactors is less than the third release temperature.

[0067] Table 1 The second release temperature is the temperature at which the battery operates normally, and the fourth release temperature is the temperature at which the second cooling device is released. The fourth release temperature is greater than the second release temperature. In this embodiment, a three-level management strategy for releasing the first cooling device of the battery is generated based on the second release temperature and the fourth release temperature.

[0068] Among them, the second release temperature is the target operating temperature determined by the above battery in real time based on the driving condition and the charge-discharge strategy. Based on the target operating temperature, when the battery temperature drops to the preset safe range, the vehicle thermal management system will stop the cooling work.

[0069] Combined with the above three-level management strategy for the battery to start the first cooling device and the second cooling device, Table 2 is generated. As shown in Table 2, the entry condition for the battery to enter the first cooling device is "Condition a", the exit condition for the battery to exit the first cooling device is "Condition b", the entry condition for the first cooling device and the second cooling device is "Condition c", and the exit condition for the first cooling device and the second cooling device is "Condition d". Among them, Condition a: Any battery temperature is greater than the first preset temperature, Condition b: All battery temperatures are less than the first release temperature, Condition c: Any battery temperature is greater than the third preset temperature, Condition d: All battery temperatures are less than the third release temperature.

[0070] Table 2 It should be noted that the above entry conditions and exit conditions, in addition to using the battery temperature as the entry and exit conditions, also include the voltage level and charge state of the battery. The voltage level of the battery will also affect the operation of the vehicle thermal management system. When the battery voltage returns to the normal range, the vehicle thermal management system may stop. During the charging process, the battery temperature may rise. After charging is completed, the battery temperature gradually drops, and the vehicle thermal management system will stop working according to the temperature change.

[0071] Combined with Table 1 and Table 2, a three - level management strategy for the battery and the contactor as shown in Table 3 is generated. The three - level management strategy includes: a first - level strategy, a second - level strategy, and a third - level strategy. Among them, the execution object of the first - level strategy is empty, and the vehicle thermal management system is not working. For the second - level strategy, the execution object is the first starting device. The first starting device circulates the coolant through the circulation liquid pump and the cooling pump, thereby helping the device to dissipate heat and keeping the battery temperature within a safe range. By flowing the coolant through the coolant pipeline inside the battery, the heat generated by the battery is transferred to the coolant, thereby reducing the battery temperature. The coolant is circulated by the cooling pump and the heat is dissipated through the heat exchanger. The first cooling device can accelerate the circulation of the coolant to ensure that the battery does not overheat, thereby improving the charging efficiency and safety. For the third - level strategy, the execution objects are the first starting device and the second starting device. The second starting device includes at least a compressor, a heat exchanger, and a fan. The coolant exchanges heat with the coolant through the heat exchanger, thereby reducing the coolant temperature. The heat dissipation fan introduces air into the battery box to take away the heat generated by the battery. The air flows into the battery box through the intake pipe, takes away the heat after passing through the battery module, and discharges the heat out of the vehicle through the exhaust pipe.

[0072] As shown in Table 3. In Table 3, when there is only the thermal management requirement of the contactor, according to the three - level management strategy of the contactor, the first cooling device and the second cooling device are started. When there is only the thermal management requirement of the battery, according to the three - level management strategy of the battery, the first cooling device and the second cooling device are started. When there are cooling requirements for both the contactor and the battery simultaneously. When there is a need to start the second cooling device for the contactor and the battery, the cooling requirement of the second cooling device can cover the requirement of the first cooling device, and at this time, the cooling requirement of the second cooling device is the main one. When there is a need for the first cooling device for both the contactor and the battery simultaneously, the starting conditions and the exit conditions of the contactor and the battery are fused. Among them, a||A in Table 3 means that when any condition A or any condition a is met, the first cooling device is started. b&&B means that when all conditions b and all conditions B are met, the first cooling device and the second cooling device are started.

[0073] Table 3 In one embodiment, after step 120 starts the first cooling device and the second cooling device, it further includes: obtaining the third temperature of the first cooling device; and starting the second cooling device when the third temperature is greater than the fifth preset temperature.

[0074] In this embodiment, the third temperature is the temperature of the liquid cooling plate. When the third temperature is greater than the fifth preset temperature, it indicates that the cooling effect of the first cooling device does not meet the expectation. At this time, the cooling function of the first cooling device fails, and it is necessary to start the second cooling device in time to improve the cooling effect of the first cooling device. It should be noted that the fifth preset temperature is used to represent the failure temperature of the liquid cooling plate, and the fifth preset temperature is used to separately evaluate whether the liquid cooling plate fails to work, which has nothing to do with the other preset temperatures. For example, when the liquid cooling plate is working normally, the working temperature of the liquid cooling plate is stable between 20 degrees Celsius and 40 degrees Celsius, and the fifth preset temperature is set to 45 degrees Celsius. When the third temperature of the liquid cooling plate is greater than 45 degrees Celsius, it is determined that the liquid cooling plate fails to work, and the second cooling device needs to be started to supplement the cooling.

[0075] Optionally, the startup condition of the third cooling device, in addition to the first temperature being greater than the fifth preset temperature, also includes: the time when the first temperature is greater than the fifth preset temperature exceeds the preset time interval, so as to reduce the misoperation of the third cooling device. For example, the fifth preset temperature is 55 degrees Celsius, and the preset time interval is 30 seconds. When the time interval during which the third temperature exceeds 55 degrees Celsius exceeds 30 seconds, the second cooling device is started.

[0076] In this embodiment, after starting the second cooling device, it further includes: obtaining the fifth release temperature corresponding to the first cooling device, the sixth release temperature corresponding to the contactor, and the seventh release temperature corresponding to the battery; when the first temperature is less than the sixth release temperature, the second temperature is less than the seventh release temperature, and the third temperature is less than the fifth release temperature, the second cooling device is turned off.

[0077] Optionally, the sixth release temperature is the same as the third release temperature, and the seventh release temperature is the same as the fourth release temperature. The release condition of the seventh release temperature includes: the time interval during which the third temperature exceeds the seventh release temperature is greater than the preset time interval. For example, the seventh release temperature is 52 degrees Celsius, and the preset time interval is 30 seconds. The release condition of the seventh release temperature includes: when the third temperature is less than 52 degrees Celsius and the duration interval is greater than 30 seconds. At this time, to turn off the second cooling device, in addition to keeping the temperature of the contactor or the battery within the safe range, it is also necessary to prove that the first cooling device is working properly by the third temperature being less than the seventh release temperature.

[0078] In one embodiment, the above method further includes: when the first temperature is greater than the sixth preset temperature, limiting the charging and discharging current of the battery within the threshold current range, and the sixth preset temperature is greater than the second preset temperature; after the charging current of the current is limited within the threshold current range, start the first cooling device and the second cooling device.

[0079] In this embodiment, when the first temperature of any contactor is greater than the sixth preset temperature, it indicates that the vehicle thermal management system cannot function independently, and it is necessary to first limit the charging and discharging of the battery to cool down.

[0080] Optionally, the starting condition of the second cooling device, in addition to the first temperature being greater than the sixth preset temperature, also includes: the time interval during which the first temperature is greater than the sixth preset temperature exceeds the preset time interval, so as to reduce the misoperation of the second cooling device. For example, the sixth preset temperature is 95 °C, and the preset time interval is 5 seconds. When the time interval during which the first temperature of any contactor exceeds 95 °C exceeds 5 seconds, the second cooling device is started.

[0081] In this embodiment, after starting the first cooling device and the second cooling device, it also includes obtaining the eighth release temperature. When the first temperature is less than the eighth release temperature, the measures to limit the charging and discharging of the battery are released. Among them, the eighth release temperature is 90 °C, and the release time interval is 5 seconds. When the time interval during which the first temperature of any contactor is less than 90 °C exceeds 5 seconds, the measures to limit the charging and discharging of the battery are released.

[0082] As Figure 5 shown, a vehicle thermal management system, the vehicle thermal management system 50 is used to cool the battery and the contactor, and the battery and the contactor are electrically connected. The vehicle thermal management system includes: a first cooling device 510, a second cooling device 520 and a control device 530. The first cooling device 510 is used to cool the battery and the contactor. The second cooling device 520 is used to improve the cooling effect of the first cooling device 510.

[0083] The control device 530 is used to obtain the first temperature of the contactor and the second temperature of the battery.

[0084] The control device 530 is also used to start the first cooling device 510 when the first temperature is greater than the first preset temperature, and / or, the second temperature is greater than the second preset temperature.

[0085] The control device 530 is also used to start the first cooling device 510 and the second cooling device 520 when the first temperature is greater than the third preset temperature, and / or, the second temperature is greater than the fourth preset temperature, where the third preset temperature is greater than the first temperature and the fourth preset temperature is greater than the second temperature.

[0086] Please refer to Figure 6 , which is the schematic hardware structure diagram of the electronic device 100 provided by the embodiment of the present application. As Figure 6As shown, the electronic device 100 may include a processor 30 and a memory 20. The memory 20 is used to store one or more computer programs 40. The one or more computer programs 40 are configured to be executed by the processor 30. The one or more computer programs 40 include instructions that can be used to implement the above-described vehicle thermal management method in the electronic device 100.

[0087] It can be understood that the structure illustrated in this embodiment does not constitute a specific limitation on the electronic device 100. In some other embodiments, the electronic device 100 may include more or fewer components than shown in the figure, or combine certain components, or split certain components, or have different component arrangements.

[0088] The processor 30 may include one or more processing units. For example, the processor 30 may include an application processor (AP), a modem, a graphics processing unit (GPU), an image signal processor (ISP), a controller, a video codec, a digital signal processor (DSP), a baseband processor, and / or a neural-network processing unit (NPU), etc. Among them, different processing units may be independent devices or integrated in one or more processors.

[0089] The processor 30 may also be provided with a memory for storing instructions and data. In some embodiments, the memory in the processor 30 is a cache memory. This memory can save the instructions or data that the processor 30 has just used or recycled. If the processor 30 needs to use the instruction or data again, it can directly call it from this memory. This avoids repeated accesses, reduces the waiting time of the processor 30, and thus improves the efficiency of the system.

[0090] In some embodiments, the processor 30 may include one or more interfaces. The interfaces may include an inter-integrated circuit (I2C) interface, an inter-integrated circuit sound (I2S) interface, a pulse code modulation (PCM) interface, a universal asynchronous receiver / transmitter (UART) interface, a mobile industry processor interface (MIPI), a general-purpose input / output (GPIO) interface, a SIM interface, and / or a USB interface, etc.

[0091] In some embodiments, the memory 20 may include high-speed random access memory and may also include non-volatile memory such as a hard disk, internal memory, plug-in hard disk, Smart Media Card (SMC), Secure Digital (SD) card, Flash Card, at least one magnetic disk storage device, flash device, or other volatile solid-state storage devices.

[0092] This embodiment also provides a vehicle including the above vehicle management system. If the integrated module / unit of the vehicle is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such an understanding, all or part of the processes in the above embodiment methods of this application can also be completed by instructing relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by a processor, the steps of the above various method embodiments can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in the form of source code, object code, executable file, or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disc, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal, and software distribution medium, etc. It should be noted that the content included in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium does not include electrical carrier signals and telecommunication signals.

[0093] The above are only specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application should be covered within the protection scope of the present application.

Claims

1. A vehicle thermal management method, applied to a vehicle thermal management system, characterized in that, The vehicle thermal management system is used to cool down the battery and the contactor, the battery and the contactor are electrically connected, and the vehicle thermal management system includes a first cooling device and a second cooling device, the first cooling device is used to cool down the battery and the contactor; the second cooling device is used to improve the cooling effect of the first cooling device; The method comprises: Acquiring a first temperature of the contactor and a second temperature of the battery; When the first temperature is greater than a first preset temperature, and / or the second temperature is greater than a second preset temperature, starting the first cooling device; When the first temperature is greater than a third preset temperature, and / or the second temperature is greater than a fourth preset temperature, the first cooling device and the second cooling device are started, wherein the third preset temperature is greater than the first preset temperature, and the fourth preset temperature is greater than the second preset temperature.

2. The method according to claim 1, wherein The method for setting the second preset temperature and the fourth preset temperature includes: Obtaining the current driving condition of the vehicle and the current charging and discharging strategy of the battery; Based on the driving condition and the charging and discharging strategy, determining a target operating temperature of the battery: Acquire a first cooling range of the first cooling device, and acquire a second cooling range of the second cooling device; According to the target operating temperature and the first temperature reduction range, setting the second preset temperature; The fourth preset temperature is set according to the target operating temperature and the second temperature reduction amplitude.

3. The method according to claim 1, wherein After the first cooling device is started and the second cooling device is not started, the method further includes: Determining a first release temperature corresponding to the contactor and a second release temperature corresponding to the battery; When the first temperature is lower than the first release temperature and the second temperature is lower than the second release temperature, the first cooling device is closed.

4. The method according to claim 1, wherein After starting the first cooling device and the second cooling device, the method further includes: Acquire a third release temperature corresponding to the contactor and a fourth release temperature corresponding to the battery; When the first temperature is lower than the third release temperature and the second temperature is lower than the fourth release temperature, the second temperature lowering device is closed.

5. The method according to claim 1, wherein After the first cooling device is started and the second cooling device is not started, the method further includes: Acquire a third temperature of the first cooling device; When the third temperature is greater than the fifth preset temperature, the second cooling device is started.

6. The method according to claim 5, characterized in that, After the second cooling device is started, the method further includes: Acquire a fifth release temperature corresponding to the first cooling device, a sixth release temperature corresponding to the contactor, and a seventh release temperature corresponding to the battery; When the first temperature is lower than the sixth release temperature, the second temperature is lower than the seventh release temperature, and the third temperature is lower than the fifth release temperature, the second temperature lowering device is turned off.

7. The method according to claim 1, characterized in that, The method further comprises: limiting the charge and discharge current of the battery within a threshold current range when the first temperature is greater than a sixth preset temperature, and the sixth preset temperature is greater than the second preset temperature; After the charging current of the current is limited within the threshold current range, start the first cooling device and the second cooling device.

8. A vehicle thermal management system, characterized in that, The vehicle thermal management system is used to cool the battery and the contactor. The battery and the contactor are electrically connected. The vehicle thermal management system includes: a first cooling device, a second cooling device and a control device. The first cooling device is used to cool the battery and the contactor; the second cooling device is used to improve the cooling effect of the first cooling device. The control device is used to obtain the first temperature of the contactor and the second temperature of the battery. The control device is further used to start the first cooling device when the first temperature is greater than the first preset temperature and / or the second temperature is greater than the second preset temperature. The control device is further used to start the first cooling device and the second cooling device when the first temperature is greater than the third preset temperature and / or the second temperature is greater than the fourth preset temperature, where the third preset temperature is greater than the first preset temperature and the fourth preset temperature is greater than the second preset temperature.

9. An electronic device, characterized in that, The electronic device includes a processor and a memory. The memory is used to store instructions, and the processor is used to call the instructions in the memory so that the electronic device executes the vehicle thermal management method according to any one of claims 1 to 7.

10. A vehicle, characterized in that, Including the vehicle thermal management system according to claim 8.

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